SPECIAL ENERGY METERS IN SOUTHERN REGION (HAND BOOK)

SPECIAL ENERGY METERS IN SOUTHERN REGION (HAND BOOK) TALCHER BHADRAVATI JEYPO RE RSTPP KAIGA NARENDRAMUNIRABAD RAICHUR BTPS JINDAL DITCHIPALLY GAJWEL P GHANAPUR MAHABOOB NAGAR P KURNOOL GOOTY MALKARAM KHAMMAM B P PPALLY MMDP SSLM M WARANGAL N SAGAR KONASEEMA VEMAGIRI GMR GVK GAUTHAMI VIJAYAWADA VTS STAGE IV KALPAKKA SIMHADRI GAZUWAKA GUTTUR HIRIYUR KADAPA P NELLORE TALGUPPA NELAMANGA LA HOODY ALMATHY SOMANAHALLI CHITTOOR KOLAR SRIPERUMBUDUR KALAVINDAPATTU MAPS MYSORE SALEM HOSUR NEYVELI NEYVELI TPS 2 (EXP) NEYVELI TPS 1 (EXP) TRICHUR P UDUMALP ET PUGALUR P TRICHY MADURAI KARAIKUDY TIRUNELVELI TRIVANDRUM POWER SYSTEM OPERATION CORPORATION LTD. SOUTHERN REGIONAL LOAD DESPATCH CENTRE BANGALORE. November 2010

I N D E X Sl. No. Description Page No: 1. SPECIAL ENERGY METERS TECHNICAL DETAILS & OPERATING INSTRUCTIONS 01-20 1.1 Technical Specification for SEMs 01-08 1.2 Salient features of SEMs 09-13 1.3 Operating Instructions for SEMs and DCDs 14-16 1.4 Software installation procedure 17-18 1.5 SEM Data Format 19 1.6 Typical Metering Diagram 20 2. SPECIAL ENERGY METERS IN SOUTHERN REGION 21-47 2.1 Summary of SEMs in Southern Region 21 2.2 Constituent-wise summary of SEMs 22-27 2.3 List of Special Energy Meters installed in Southern Region 28-46 2.4 Master Frequency SEMs 47 3. SPECIAL ENERGY METERS LOCATION DIAGRAMS 48-67 3.1 General 3.1(a) Location diagram of SEMs in SR 400 KV System 48 3.1(b) Location diagram of SEMs in State owned Inter-State lines 49 3.1(c) Location diagram of SEMs in ISTS network 50 3.1(d) Location diagram of SEMs in 400kV substations 51-55 3.2 Location diagram of SEMs at ISGSs 3.2(a) Ramagundam STPS 56 3.2(b) Talcher STPP-II 57 3.2(c) Neyveli Lignite Corporation 58 3.2(d) Madras Atomic Power Station 59 3.2(e) Kaiga Generating Station 60 3.3 Location diagram of SEMs at Drawee utilities 3.3(a) APTRANSCO system 61

3.3(b) KPTCL system 62 3.3(c) KSEB system 63 3.3(d) TNEB system 64 3.3(e) Pondicherry system 65 3.3(f) Goa system 66 3.3(g) PG-HVDC system 67 4. COMPUTATION OF INJECTION AND DRAWAL 68-85 4.1 Accounting Methodology 68-71 4.2 Computation of injection by ISGSs 72-77 4.2(a) Ramagundam STPS 72 4.2(b) Talcher STPP-II 73 4.2(c) Neyveli Lignite Corporation (TS2 Stage-1, TS2 Stage-2) 74 4.2(d) Neyveli Lignite Corporation TPS-1 Expansion 75 4.2(e) Madras Atomic Power Station 76 4.2(f) Kaiga Generating Station 76 4.2(g) Western Region 77 4.2(h) Eastern Region 77 4.3 Computation of drawal by Drawee Utilities 4.3(a) APTRANSCO system 78-79 4.3(b) KPTCL system 80-81 4.3(c) KSEB system 82 4.3(d) TNEB system 83-84 4.3(e) Pondicherry system 85 4.3(f) Goa system 85 4.3(g) PG-HVDC system 85 5. FUTURE REQUIREMENT OF SEMs IN SR 1.1 FUTURE REQUIREMENTS IN SR-II 86-89 1.2 FUTURE REQUIREMENTS IN SR-I 90

SECTION - 1 SPECIAL ENERGY METERS TECHNICAL DETAILS & OPERATING INSTRUCTIONS

SPECIAL ENERGY METERS TECHNICAL DETAILS & OPERATING INSTRUCTIONS 1.1 Technical Specification for SEMs 1.2 Salient features of SEMs 1.3 Operating Instructions for SEMs and DCDs 1.4 Software installation procedure 1.5 SEM Data Format 1.6 Typical Metering Diagram

1.1 TECHNICAL SPECIFICATION FOR SEMs Technical Specification* 1.0 The energy metering system specified herein shall be used for tariff metering for bulk, inter-utility power flows, in different Regions of India. One static type composite meter shall be installed for each EHV circuit, as a self-contained device for measurement of active energy (MWh) transmittals in each successive 15 minute block and certain other functions, as described in the following paragraphs. 2.0 The meters shall be suitable for being connected directly to voltage transformers (VTs) having a rated secondary line-to-line voltage of 110V, and to current transformers (CTs) having a rated secondary current of 1 A (model-a) or 5A (model-b). Any further transformers/transactions/transducers required for their functioning shall be in-built in the meters. Necessary isolation and/or suppression shall also be built-in, for protecting the meters from surges and voltage spikes that occur in the VT and CT circuits of extra high voltage switchyards. The reference frequency shall be 50Hz. 3.0 The active energy (Wh) measurement shall be carried out on 3-phase, 4-wire principle, with an accuracy as per class 0.2 S of IEC-687-1992-06 (2 nd edition)/ IEC-62053-22:2003. In model-a (for CT secondary rating 1A), the energy shall be computed directly in CT and VT secondary quantities, and indicated in watt-hours. The meter shall compute the net active energy (Wh) sent out from the substation bus bars during each successive 15-minutes block, and store it in its memory along with plus/minus sign. It shall also display on demand the net Wh sent out during the previous 15-minute block, with a minus sign if there is net Wh export. 4.0 Further, the meter shall continuously integrate and display on demand the net cumulative active energy sent out from the substation bus bars upto that time. The cumulative Wh reading at each midnight shall be stored in the meter s memory. The register shall move backwards when active power flows back to substation bus bars. 5.0 The meter shall count the number of cycles in VT output during each successive 15-minutes block, and divide the same by 900 to arrive at the average frequency. This shall be stored in the meter s memory as a 2-digit code which shall be arrived at by subtracting 49 from the average frequency, multiplying by 50 and neglecting all decimals. For example, 49.89 Hz shall be recorded as 44. In case the average frequency is less than 49.0 Hz, it shall be recorded as 00. In case it is 51.0 Hz or higher, it shall be recorded as 99. The average frequency of the previous 15- minutes block shall also be displayed, on demand in hertz. * Note: This specification is applicable to the meters procured by POWERGRID in general,while the underlined items are the modifications carried out in the specification in respect of SEMs procured after 2005. SRLDC 1 SEMs IN SOUTHERN REGION

6.0 The meter shall continuously compute the average of the RMS values of the three line-to-neutral VT secondary voltages as a percentage of 63.51 V, and display the same on demand. The accuracy of the voltage measurement/computation shall be atleast 0.5%, a better accuracy such as 0.2% in the 95-105% range being desirable. 7.0 The meter shall also compute the reactive power (VAR) on 3-phase, 4-wire principle, with an accuracy as specified in clause 11.0, and integrate the reactive energy (VARh) algebraically into two separate registers, one for the period for which the average RMS voltage is 103.0% or higher, and the other for the period for which the average RMS voltage is below 97.0%. The current reactive power (VAR), with a minus sign if negative, and cumulative reactive energy (VARh) readings of the two registers shall be displayed on demand. The readings of the two registers at each midnight shall also be stored in the meter s memory. In model-a (for CT secondary rating of 1 A), the reactive power and reactive energy transmittals shall be computed in VAR/VARh directly calculated in CT and VT secondary quantities. When lagging reactive power is being sent out from substation bus bars, VAR display shall have a plus sign or no sign and VARh registers shall move forward. When reactive power flow is in the reverse direction, VAR display shall have negative sign and VARh registers shall move backwards. 8.0 In the model-b (for CT secondary rating of 5A), all computations, displays and memory storage shall be similar except that all figures shall be one fifth of the actual Wh, VAR and VARh worked out from CT and VT secondary quantities. 9.0 The meters shall fully comply with all stipulations in IEC standards 687-1992-06 (2 nd edition)/62052-11:2003 and 62053-22:2003, except those specifically modified by this specification. The reference ambient temperature shall be 30 C. 10.0 Errors shall be reasonable for all power factor angles from 0 to 360. 11.0 For reactive power (VAR) and reactive energy (VARh) measurements, IEC/145 / IEC 62053-23:2003 shall be complied with. The accuracy of measurement of reactive energy shall be as per class 2. 12.0 Each meter shall have a test output device (visual) for checking the accuracy of active energy (Wh) measurement. The preferred pulsing rate is twenty(20) per Wh for Model-A and four(4) per Wh for model B. It shall be possible to couple this device to suitable testing equipment also. 13.0 No rounding off to the next higher last decimal shall be done for voltage and frequency displays. All 15 minute Wh figures shall however be rounded off to the nearest last decimal. 14.0 The three line-to-neutral voltage shall be continuously monitored and in case any of these falls below about 70%, a normally flashing lamp provided on meter s front shall become steady. It shall go off it all three voltages fall below 70%. The time blocks in which such a voltage failure occurs/persists shall also be recorded in the meter s memory. The lamp shall automatically resume flashing when all VT SRLDC 2 SEMs IN SOUTHERN REGION

secondary voltages are healthy again. The two VARh registers specified in clause 7.0 shall remain stay-put while VT supply is unhealthy. 15.0 The meters shall normally operate with the power drawn from the VT secondary circuits. The total burden imposed by a meter for measurement and operation shall not exceed 10 VA on any of the phases. An automatic backup for continued operation of the meter s calendar-clock, and for retaining all data stored in its memory, shall be provided through a long-life battery, which shall be capable of supplying the required power for at least 2 years. The meters shall be supplied duly fitted with the batteries, which shall not require to be changed for atleast 10 years, as long as total VT supply interruption does not exceed two years. The battery mounting shall be designed to facilitate easy battery replacement without affecting PCB of the meter. The meters shall not require any separate auxiliary supply for their operation. All displays may disappear on loss of VT supply. 16.0 Each meter shall have a built-in calendar and clock, having an accuracy of 30 seconds per month or better. The calendar and clock shall be correctly set at the manufacturer s works. The date (year-month-day) and time (hour-min.-sec.) shall be displayed on the meter front (when VT supply has been connected), on demand. Only limited clock adjustment shall be possible at site, using the DCD. When an advance or retard command is given, six subsequent time blocks shall be contracted or elongated by ten seconds each. The meter shall not accept another clock correction command for seven days. All clock corrections shall be registered in the meter s memory and suitably shown on print out of collected data. 17.0 Each meter shall have a unique identification code, which shall be marked permanently on its front, as well as in its memory. All meters supplied to POWERGRID as per this specification shall have their identification code starting with NP, which shall not be used for any other supplies. NP shall be followed by a dash and a four digit running serial number, further followed by a dash and A for Model-A, and B, for the use with CT secondary of 1 A and 5 A respectively. 18.0 Each meter shall have atleast one seven (7)-character, seven-segment electronic display, for indication of the following (one at a time), on demand: i) Processor s identification code and model : NP1234 A ii) Date (year month day) : 910329 d iii) Time ( hour min. sec. ) : 195527 t iv) Cumulative Wh reading : 12345.6 C v) Average frequency of the previous block : 49.89 F vi) Net Wh transmittal during the previous block: - 28.75 E vii) Average % voltage : 99.2 U viii) Reactive power (VAR) : 106.5 r ix) Voltage - high VARh register reading : 01234.5 H x) Voltage - low VARh register reading : 00123.4 L xi) Low battery indication SRLDC 3 SEMs IN SOUTHERN REGION

19.0 A gold plated touch key or push button shall be provided on the meter front for switching on the display and for changing from one indication to the next. (The display shall switch off automatically about one minute after the last operation of touch key/push button). When the display is switched on, the parameter last displayed shall be displayed again, duly updated. 20.0 Each meter shall have a non-volatile memory in which the following shall be automatically stored: i) Average frequency for each successive 15-minute block, as a 2-digit code ii) iii) iv) Net Wh transmittal during each successive 15-minute block, upto second decimal, with plus/minus sign Cumulative Wh transmittal at each midnight, in six digits including one decimal Cumulative VARh transmittal for voltage high condition, at each midnight in six digits including one decimal v) Cumulative VARh transmittal for voltage low condition, at each midnight, in six digits including one decimal vi) Date and time blocks of failure of VT supply on any phase, as a star (*) mark 21.0 The meters shall store all the above listed data in their memories for a period of ten (10) days. The data older than ten (10) days shall get erased automatically. 22.0 Each meter shall have an optical port on its front for tapping all data stored in its memory. Portable or hand held data collection devices shall also be separately provided for this purpose, one for each substation, to serve as the interface between the meters specified above and the local personal computer (PC). In addition to above each meter shall be provided with a RS-485 port on one of it s sides, from where all the data stored in the meter s memory can also be tapped. The overall intention is to tap the data stored in the meter s memories once a week from any of the two ports mentioned above and transmit the same to a remote central computer using STD or other communication links, through the local PC. It shall also be possible to obtain a print out (hard copy) of all data collected from the meters, using the local PC. SRLDC 4 SEMs IN SOUTHERN REGION

23.0 The whole system shall be such as to provide a print out (both from the local PC, and from remote central computer) of the following form: 16 55 +16.28 56 +15.95 55 +15.32 54 +15.66 20 55 +14.93 55 +14.26 54 +14.85 56 +15.17 NP-1234-A 12345.6 01234.5 00123.4 29-03-91 00 57 +14.72 56 +13.83 55 +13.57 53 +12.91 04 52 +13.34 51 +12.76 52 +14.11 52 +15.28 24.0 The meters shall be supplied housed in compact and sturdy, metallic or moulded cases of non-rusting construction and/or finish. The cases shall be designed for simple mounting on a plane, vertical surface such as a control/relay panel front. All terminals for CT and VT connections shall be arranged in a row along the meter s lower side. Terminals shall have a suitable construction with barriers and cover, to provide a secure and safe connection of CTs and VTs leads through stranded copper conductors of 2.5 sq. mm. size. 25.0 All meters of the same model shall be totally identical in all respects except for their unique identification codes. They shall also be totally sealed and tamper proof, with no possibility of any adjustment at site, except for clock correction. 26.0 The meters shall safely withstand the usual fluctuations arising during faults etc. In particular, VT secondary voltages 115% of rated applied continuously and 190% of rated for 3.0 seconds, and CT secondary current 150% of rated applied continuously and 30 times of rated applied for 0.5 seconds shall not cause any damage to or maloperation of the meters. 27.0 The meters shall also withstand without any damage or maloperation reasonable mechanical shocks, earthquake forces, ambient temperature variations, relative humidity etc. They shall have an IP-51 category dust-tight construction, and shall be capable of satisfactory operation in an indoor, non-air conditioned installation. 28.0 The meters shall continue to function for the remaining healthy phase(s), in case one or two phases of VT supply fails. In case of a complete VT supply failure, the computation of average frequency (as per 5.0) shall be done only for the period during which the VT supply was available in the 15-minute block. Any time block contraction or elongation for clock correction shall also be duly accounted for. 29.0 The harmonics shall preferably be filtered out while measuring Wh, VAR and VARh, and only fundamental frequency quantities shall be measured/computed. 30.0 Either the meters shall have built-in facility (eg. test links in their terminals) for insitu testing, or a separate test block shall be provided for each meter. SRLDC 5 SEMs IN SOUTHERN REGION

31.0 Portable/hand-held Data Collection Devices (DCD) : These shall be tailor-made for tapping all data stored in a meter s memory, and faithfully transferring it to the local PC. Each device shall be supplied complete with i) a lead with optical head for coupling it to the meter, ii) a lead for plugging it to a personal computer; iii) an internal battery for powering the devices; iv) a case for safely carrying it about v) a battery charger The total arrangement shall be such that one (1) operation can carry out the whole operation himself, in about five (5) minutes per meter. 32.0 The DCD shall have a key for starting the data tapping from the coupled meter s memory, a key to start data transfer to the PC, and a lamp, which would light up on completion of data collection, remain on while the data is held in the device and would go off when all data has been transferred to the PC. Data tapping operation shall not erase the data from the meter s memory, or effect the meter operation in any way. The memory of the DCD shall get automatically cleared when the data has been transferred to the PC only then the DCD shall accept data from another meter. DCDs shall also have necessary provision for meter clock correction. DCDs shall be compatible with earlier supplied meters of L&T/SML make in regard to data downloading etc. 33.0 The Contractor shall provide the necessary software which would enable a local IBM-Compatible PC to (i) accept the data from the DCD and/or from a interface device connected to the optical port/rs-485 port and store it in it s memory in binary read only format, (ii) Polling feature along with a task scheduler to run the data downloading software at a pre-designated date and time repeatedly or by manually selecting a meter. A detailed activity log shall also be available for each downloading operation, (iii) display the collected data on PC s screen in text format, with forward/backward rolling, (iv) print out in text format the data collected from one or more meters, starting from a certain date and time, as per operator s instructions, (v) transmit the collected data, in binary format, through an appropriate communication link to the central computer, starting from a certain date and time, as per operator s instructions, and (vi) store the collected data,in binary format, on a floppy disc/cd/pen Device. 34.0 The above software shall further ensure that absolutely no tampering (except total erasures) of the collected metering data is possible during its handling by the PC. The software shall be suitable for the commonly available PCs, and shall be supplied to Owner in a compatible form to enable its easy loading into the PCs available (or to be installed by the Owner/others) at the various substations. SRLDC 6 SEMs IN SOUTHERN REGION

35.0 Quality Assurance The quality control procedure to be adopted during manufacture of the specified equipment shall be mutually discussed and finalized in due course, generally based on the established and proven practices of the manufacturer. 36.0 Testing All equipment, after final assembly and before dispatch from manufacturer s works, shall be duly tested to verify that is suitable for supply to the Owner. In particular, each and every meter shall be subjected to the following acceptance tests: i) Verification of compliance with Table 9 of IEC-687-1992-06 (2 nd edition) / clause 8.1 of IEC-62053-22:2003, in both directions of power flow, for class 0.2S. ii) iii) iv) Test of the register ratio and the impulse value of the transmitting device, for both directions. Verification that VARh measurement errors are within values permitted for class 2 in Table-1 of IEC-145 / Table 6 of IEC 62053-23 for both directions of power flow. Effect of +10% variation in measuring circuit voltage, on accuracy of Wh and VARh measurement v) Power loss. vi) vii) viii) ix) Dielectric properties. Starting and running with no-load for Wh and VARh, in both directions. Functional checks for display and memory. Accuracy of the calendar and clock. x) Accuracy of voltage and frequency measurement. 37.0 Any meter which fails to fully comply with the specification requirements shall be liable to be rejected by the Owner. However, the Owner may purchase such meters at a reduced price in case of marginal non-compliance, at his sole discretion. SRLDC 7 SEMs IN SOUTHERN REGION

38.0 Acceptance Tests for DCD and PC Software All DCDs, after final assembly and before despatch from Contractor s/manufacturer s works shall be duly tested to verify that they are suitable for supply to the Purchaser. In particular, each and every DCD shall be subjected to the following acceptance test: i) Functional checks ii) Downloading Meter Data from the Meter(s) iii) Compatibility with PC Software iv) Downloading the meter data on PC v) Functioning of advance and retard time commands vi) Per meter downloading time verification vii) Capacity of DCD for data storage 39.0 Type Tests One (1) out of every hundred (100) meters shall be subjected to the complete range of type tests as per IEC-687-1992-06 (2 nd edition) / IEC-62053-22:2003, IEC- 62053-23:2003 and IEC 62052-11:2003, after final assembly. In case of any failure to pass all specified tests, the contractor shall arrange to carry out the requisite modifications/replacements in the entire lot of meters at his own cost. After any such modifications and final assembly, two (2) meters selected out of the lot by the Owner s representative shall be subjected to the full range of type tests. The lot shall be accepted by the Owner only after successful type testing. 40.0 Installation and Commissioning The static energy meters specified above shall be installed at various EHV substations owned by the Owner, SEBs and other agencies, throughout India. The exact location and time-table for installation shall be finalized by the Owner in due course, and advised to the contractor, such that contractor s responsibility in this respect ends within six (6) months of completion of all supplies. 41.0 The Contractor shall be responsible for total installation and commissioning of the meters (along with test blocks, if supplied separately) as per Owner s advice, including unpacking and inspection on receipt at site, mounting the meters on existing control and relay panels at an appropriate viewing height, connection of CT and VT circuits including any required rewiring, functional testing, commissioning and handing over. The Contractor s personnel shall procure/carry the necessary tools, equipment, materials and consumables (including insulated wires, lugs, ferrules, hardware etc.) 42.0 As a part of commissioning of DCDs the Contractor shall load the software specified in clause 33 and 34 into the PCs at the respective substations, and fully commission the total meter reading scheme. He shall also impart the necessary instructions to substation engineers. SRLDC 8 SEMs IN SOUTHERN REGION

1.2 SALIENT FEATURES OF SEMs Special Energy Meters The meters are of 0.2S accuracy class and are specially designed for Frequency Linked Tariff Metering scheme for Inter Utility Exchanges at Grid level. Salient features : Static type Totally Electronic Compliant with IEC 687 / IEC-62053-22:2003 standard Better accuracy (0.2S class) Composite meter capable of measuring Active and Reactive Energy in all 4 quadrants 3 phase-4 wire measurement Direct measurement as per CT/PT secondary quantities Filters harmonics and measure energy at fundamental frequencies. Operates on self power from connected PT supply (110V Ph to Ph/ 63.51 V Ph-N) Different Current ratings suiting to CT secondary [ex. 1 Amp (A-type meter) or 5 Amp (B type Meter)] VA burden not more than 10 on any of the phases Works on Real Time Clock (RTC) hence data is time stamped. Time adjustment facility ( in steps of 1 min in a week ) No calibration required due to absence of moving parts. Calibration possible only at Manufacturers works High security of data storage Criteria for location of SEMs Main Meters: Those SEMs primarily used for Energy Accounting / Billing Check Meters: Those SEMs connected to the same CT/PT as the Main meter. They are used for Energy Accounting / Billing in case of Discrepancy in reading of Main Meter. SRLDC 9 SEMs IN SOUTHERN REGION

Standby Meters: These SEMs are used for Energy Accounting in case of Discrepancy in reading of Main meter as well as Check Meter. These are connected to other set of CT/PTs as that of the Main Meter. Sl. Description Main Meters Check Meters Standby Meters No. 1. Injection of all Outgoing Outgoing GTs and TTs Generating Stations Feeders Feeders except NLC, MAPS & KAIGA 2. Injection of Other GTs and SUTs GTs and Outgoing Feeders Generating Stations SUTs NLC, MAPS & KAIGA 3 Drawl by a HV side of None LV and Tertiary Beneficiary at CTU ICTs side of ICT (if Substations tapped) 4 Drawl by a Beneficiary on a State owned inter-state line Respective end. None Other end 5. 400 kv CTU Lines None None One end of the Line The above details are only indicative and may vary depending on the prevalent scheme and availability of CTs/PTs at a particular station. However, the Regulations published on 17 th March 2006 by CEA for regulating the Installation and Operation of Meters specify the location of meters (item 7) as follows: Quote: The location of interface meters, consumer meters and energy accounting and audit meters shall be as per the Table given below: Provided that the generating companies or licensees may install meters at additional locations in their systems depending upon the requirement. Sl. No Stages A. Generating Station TABLE Main Meter On all outgoing feeders Check Meter On all outgoing feeders Standby Meter (i) High Voltage (HV) side of Generator Transformers (ii) High Voltage (HV) side of all Station Auxiliary Transformers SRLDC 10 SEMs IN SOUTHERN REGION

Explanation: The location of main, check and standby meters installed at the existing generating stations shall not be changed unless permitted by the Authority/ B. Transmission and Distribution System C. Inter- Connecting Transformer (ICT) D. Consumer directly connected to the Inter-State Transmission System or Intra-State Transmission System who have to be covered under ABT and have been permitted open access by the Appropriate Commission or Any other system not covered above. Unquote At one end of the line between the substations of the same licensee, and both ends of the line between substations of two different licensees. Meters at both ends shall be considered as main meters for respective licensees. High Voltage (HV) side of ICT As decided by the Appropriate Commission. Sign convention of Active and Reactive energy recorded (i) For SEMs on all locations except GTs at Generating station. There shall be no separate standby meter. Meter installed at other end of the line in case of two different licensees shall work as standby meter. Low Voltage (LV) side of ICT When energy (active/reactive) flows out of the bus to which the SEM is connected, the energy is recorded with a + sign and vice versa. SRLDC 11 SEMs IN SOUTHERN REGION

(ii) For SEMs on GTs at Generating Stations When energy (active/reactive) flows into the bus to which the SEM is connected, the energy is recorded with a + sign and vice versa. Accordingly the values in the cumulative registers for active energy and reactive energy keep incrementing when the net energy for a particular time period recorded is +ve and decrementing when it is -ve. For example if the initial value of these registers is 00000.0 (say) and the net energy in a block is 25.0 (say), the cumulative value of the register increments to 00025.0. Once the value reaches 99999.9, the same will get reset to 00000.0 Details of Data recorded : No multiplication Factor is incorporated in the Meter. Hence data in Secondary side (Wh) is recorded. Meter can be interchanged from one location to another irrespective of their CT/PT ratios To get data on Primary side in MWh, the secondary side data in Wh is to be multiplied by the connected CT/PT ratio. Stores the following data for previous 9 days and the current day period (in case of SMLOLD meters) and previous 10 days and current day period (in case of SMLNEW and L&T meters). Data recorded in every Block : Net Active Energy in 15 min. Time blocks (Wh) Average frequency in 15 min. Time block (records frequency in the band of 49Hz<f<51.00Hz in steps of 0.02Hz in a coded form as integer from 00 to 99) FC = (f-49)*50 where FC means Frequency Code f means Frequency Voltage failure flag. ( a * mark is recorded if Avg. Voltage in the three phases falls below 70%) Time Correction flag ( aa if time is advanced and rr if time is retarded). Data recorded once in a day at 00:00 hrs : (1) Sl. No. Of meter (2) Cumulative active energy register C (3) High voltage reactive energy register H (4) Low voltage reactive energy register L (5) Date SRLDC 12 SEMs IN SOUTHERN REGION

Details of Data appearing on the LED display on the front of the SEM On pressing a push button the following are seen in a cyclic manner: (i) LED check (ii) Meter Serial no. (iii) Date (iv) Time (v) Active Energy in previous 15 min. Block (Wh) (vi) Average Frequency in previous 15 min. Block (Hz.) (vii) Cumulative active energy register C (Wh) (viii) High Voltage Reactive Energy Register H (Varh) (ix) Low voltage Reactive Energy Register L (Varh) (x) Instantaneous average voltage of the 3 ph. U (%) (xi) Instantaneous reactive power r (Var) SRLDC 13 SEMs IN SOUTHERN REGION

1.3 OPERATING INSTRUCTIONS FOR SEMs AND DCDs 1) SEMs Data Collection Every Monday morning data is to be collected using a Data Collecting Device (DCD), a small hand held unit though an Optical Coupler Cable The same is used to dump the SEM data into a PC using a Serial Port Communication Cable with the help of a manufacturer supplied software. The text form of the data is to be created through this software and is to be checked for proper format and syntactic correctness. Voltage failure flags (*) are to be correlated with PT supply failures due to feeder shutdowns / Blown fuse, Switching operations etc. Time Correction flags (aa/rr) are to be correlated with the Time Advance/Retard commands given through DCD. After all the above checks, the binary coded file (*.MRI in case of SML meters or *.DCD and *.DAT in case of L&T meters as the case may be) is to be transmitted to SRLDC through e- mail The reasons for Voltage Failure flags shall be intimated to SRLDC for incorporating necessary adjustments for under recording. Time correction flags shall also be intimated so that the same can be analysed further. The data along with above information and site observations shall be e-mailed to sem@srldc.org., sreasem@vsnl.com, sreasem@hotmail.com, and sreasem@gmail.com 2) Data collection in case of feeder outage In case the feeder is in out of service condition the meter will not communicate with DCD as the power supply to the meter will not be available. In such cases for enabling data collection a single phase supply of 63.5V may be extended between any of the phase and neutral points of the voltage terminal of the meter through a means like Variac or any such transformer which gives the required output. While doing this, permission may be obtained from local operational staff and due care may be taken to effect necessary isolations like removal of PT fuse or corresponding PT input wiring to the meter etc. SRLDC 14 SEMs IN SOUTHERN REGION

In case of L&T meters a battery back up button is provided for data collection during the feeder outage conditions. The same may be kept pressed and data shall be collected. This button is to be sparingly used to conserve the battery back-up and is to be kept pressed while data collection is going on 3) Periodical Checks : SEMs Special energy meter may be periodically checked for any low voltage LED indication. If the LED becomes steady, it indicates the average voltage falling below 70%. PT inputs may be checked for any blown fuse etc. The push button display on the front panel may be made use of, for periodical checking of various parameters measured by the meter Time Drift checking Since the data recorded by SEM is time stamped (15 min. block data), it is very important to maintain the time of the meter, as it is prone to drift due to inherent variation of parameters like temperature, humidity etc. The time of the meter (Real Time Clock) as shown on the display panel of the SEM may be periodically checked for its correctness with respect to GPS/AIR time. When the time drift is more than 1 minute, necessary correction through the DCD may be carried out. It may be noted that time correction through DCD can be done by only 1 minute in a week and if the drift is more than 2 minutes, correction may be carried out in successive weeks. Due care may be taken regarding the type of correction i.e. ADVANCE or RETARD depending on whether the meter is SLOW or FAST. All the sites have to send monthly reports on the time drift of the SEMs as on the 1 st Monday of the month and also the Time corrections carried out during the month. DCDs Manual for DCD shall be thoroughly studied to ensure proper operation of DCD. DCD may be carefully handled and preserved in a suitable cover, when not in use. Healthiness of Data Collecting Device (DCD) and associated cables, accessories like charger, battery etc. shall be maintained to avoid last minute emergencies. It is preferred to use a fully charged battery with the DCD before data collection. In case of Analogic DCDs, the DCD may be kept in charged condition for at least 24 hours before data collection. SRLDC 15 SEMs IN SOUTHERN REGION

4) Special precautions SEMs i) Never keep the SEM in De-energised condition for long durations, to avoid drain on the internal battery. In case of spare meters, the SEM may be kept in charged condition by extending the supply to the voltage terminals. ii) iii) iv) Never leave the optical window uncovered. Otherwise entry of dust particles on the window glass may result in problems in data collection because of improper communication of DCD with the meter. Never remove the optical cable from the meter while data collection is in progress. Doing so may result in hanging of the internal processor because the same would be in handshaking mode with the DCD till the data collection process is completed. Never subject the meter to extreme climatic conditions. It may be suitably guarded in a safe panel free from dust and water ingression. DCDs i) Never use a non-chargeable/disposable Battery cell in the DCD as it is prone to improper drain characteristics. ii) iii) Never fold the optical cable used for data collection or data dumping cable as this may result in cutting of the internal strands or opening of the soldered joints. Never leave the Analogic DCDs (supplied with L&T and SML new meters) in uncharged condition for a long time as it may result in corruption of the internal software. SRLDC 16 SEMs IN SOUTHERN REGION

1.4 SOFTWARE INSTALLATION PROCEDURE A software provided by the meter manufacturer is required to be installed in the PC where SEM data is to be dumped. In case of SEMs supplied by SML, the name of the software is SMARTGRID in Windows version and FBM_SYS in DOS version. In case of SEMs supplied by L&T the software is called VINCOM in Windows version and LUCID in DOS version. The DOS version of these programs can be installed by simply copying the concerned folders. The programs may be run by double clicking on the respective files viz. FBM_SYS.EXE or LUCID.EXE or executing tem from DOS prompt. For installation of the Windows version of the software the following procedure may be followed: SMARTGRID INSTALLATION 1. Insert CD and go to folder S_Grid\Disc1. 2. Run Setup file with PC symbol by double clicking the same. Installation sequence will ask you to enter the drive/folder where Smartgrid is to be installed. Select the same as per your choice. 3. The software is copyright protected and hence a protection floppy is provided along with the CD to copy the copyright permission into the PC. The floppy can be utilized for installation in two PCs. 4. For installing the copyright permission files, insert the protection floppy. Copy Smartini & Keys.dat files from floppy and paste them in C:\Smartgrid directory. Go to DOS prompt and then to A: drive and type install A:C: or the drive where you installed the files as in step 2. The following messages will appear on screen in sequence: Installing Protection system Installing. Complete. Copying all pertinent files 1 file(s) copied 1 file(s) copied A:\> Now the program is ready for use. It can be executed by clicking on the Smartgrid icon in the Programs Menu or in the corresponding folder. After opening the program the following details are to be entered User Name: Supervisor Password: superpower SRLDC 17 SEMs IN SOUTHERN REGION

The menu in the program appears and the same is self explanatory. For further guidelines, Help menu may be referred. 5. If the software from this PC is to be removed, first the copyright permission shall be transferred from the PC to protection floppy to utilize the same in another location. Then uninstall the program files from PC. i) For transferring the copyright permission from PC to floppy: Insert the Protection floppy and type the following command: A:\>Remove C: or D: or E: or F: A: where C/D/E/F is the drive name where software was installed. The following messages will appear in sequence: A:\>SCPBAT R C: A:GRIDSVR /E/V/D Removing. Complete. A:\> Now the copyright file is restored from PC to floppy, so that the same can be used for another installation. ii) For uninstalling the program files from the PC: Uninstall the Smartgrid software through Add/Remove programmes menu in Control Panel in My Computer. VINCOM INSTALLATION Insert the CD containing VINCOM software and unzip the files contained in VINCOM 0203f.zip to a Folder of your choice. Open that folder and double click on the set up file (with computer icon) and follow the procedure displayed. The program would ask details such as consumer name, invoice No., consumer code etc. Ignore the same. At this stage, press Alt + Tab keys together and follow the steps given thereof. After completion of installation, the computer would prompt for restarting of the computer. After restarting of the computer go the Programs Menu and click on the VINCOM icon The opening screen appears requiring to enter the following details: User ID : Administrator Password : admin After entering the above details, the program is ready for use and the menu displayed is self explanatory. Further guidance can be obtained from the Help Menu. SRLDC 18 SEMs IN SOUTHERN REGION

1.5 SEM DATA FORMAT Meter serial number Cumalative C Reg. for Active Energy From date & time Cumalative H Reg. for Reactive Energy under High Voltage (>103%) To date & time WEEK FROM 0000 HRS OF 13-11-05 TO 0953 HRS OF 22-11-05 NP-0138-A 00285.1 37994.0 00376.2 13-11-05 Cumalative L Reg. for Reactive Energy under Low Voltage (<97%) Week heading Day heading 00 56-06.14 56-06.00 58 05.78.... 63-05.42 04 61-05.42 53-05.50 52-05.62.... 60-06.33 08 54-06.93 54-07.55 56 * -07.06.... 53aa -06.69 12 56-05.70 54-05.77 55-05.75.... 58rr -05.86 16 58-06.78 52-06.91 53-07.01.... 55-07.22 20 53 * -16.59 56-16.26 59-15.76.... 60-14.53-751.67 NP-0138-A 99533.4 37722.1 00376.2 14-11-05 Time of the Block Average Frequency in the 15 min Time Block in an Integer Code Active Energy in the 15 min. Time Block Day total of Wh Data for 1 Time Block Voltage Low Flag Day heading for next day Time Advance/ Retard Flag SRLDC 19 SEMs IN SOUTHERN REGION

1.6 TYPICAL METERING DIAGRAM NTPC Stations (ISGS-1) Aux. Aux. Other than NTPC Stations (ISGS-II) Aux. ISTS V T F F' SEB-B A B D E C U W G L S H M SEB- A J J' ISGS -I K K' ISTS N O P Q R ISTS M1 C 1 S1 M2 C 2 S2 ISGS-I injection Main = (F+G+H+J+K) Check=(F'+L+M+J'+K') Standby = (A+B+C+D+E) ISGS -II Main Standby Meter Check SEB-B X Y SEB- A SEB- A ISGS-II injection Main = (M1+M2) Check=(C1+C2) Standby = (S1+S2) SEB-B drawal Main = (T+U+X) Standby = (V+W+Y) SRLDC 20 SEMs IN SOUTHERN REGION

SECTION 2 SPECIAL ENERGY METERS IN SOUTHERN REGION

SPECIAL ENERGY METERS IN SOUTHERN REGION 2.1 Summary of SEMs in Southern Region 2.2 Constituent-wise summary of SEMs 2.3 List of Special Energy Meters installed in Southern Region 2.4 Master Frequency SEMs

Ref. No. 2.1 SUMMARY OF SEMs IN SOUTHERN REGION Agency No. of locations No. of meters A-Type SML (new) SML(old) 2000 series 4000 series L&T SML B-Type L&T (A) NTPC 2 26 0 28 17 0 0 71 (B) NLC # 2 29 14 0 68 0 0 111 (C ) NPC 2 0 1 27 2 0 0 30 (D) LKPPL 1 0 0 0 2 0 0 2 (E) APTRANSCO 17 4 0 3 26 0 0 33 (F) KPTCL 14 3 7 12 23 0 0 45 (G) KSEB 6 0 0 0 6 0 1 7 (H) TNEB 11 4 2 1 7 3 0 17 (I) PONDICHERRY 3 0 0 0 3 0 0 3 (J) GOA 2 2 0 0 2 0 0 4 Total No. of meters (K) PG-HVDC 3 0 1 * 5 * 3 * 0 0 9* (L) CTU(POWERGRID) 29 0 12 35 202 1 0 250 (M) WR 2 0 2 * 3 * 0 0 0 5* (N) ER 3 0 1* 5 * 3 * 0 0 9* (O) TOTAL 97 68 36 106 360 4 1 573 # This includes 60 Nos. and 14 nos. of A type meters installed by NLC at NLC-TS-II and NLC TPS-I Exp. respectively. All other meters at NLC are installed by POWERGRID * Meters not considered in SR Total 3 PG-HVDC meters in (K) are included in (L) also. 6 PG-HVDC meters in (K) are included in (N) also Besides above, 5 Meters in WR (M) & 9 meters in ER (O) are also not considered in SR total. SRLDC 21 SEMs IN SOUTHERN REGION

2.2 CONSTITUENTWISE SUMMARY OF SEMs (A) National Thermal Power Corporation Ltd. Sl.No. Location Name SML(old) 2000 series 4000 series SML L&T 1 Ramagundam STPS 26 0 8 13 0 0 47 2 Talcher STPS 0 0 20 4 0 0 24 TOTAL 26 0 28 17 0 0 71 (B) Neyveli Lignite Corporation Ltd. No. of meters A-Type B-Type Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 NLC TS-II 29 0 0 60 0 0 89 2 NLC TPS-I Expansion 0 14 0 0 0 0 14 3 NLC TPS-II Expansion 0 0 0 8 0 0 8 (C) Nuclear Power Corporation Ltd. No. of meters A-Type SML (new) L&T B-Type Total TOTAL 29 14 0 68 0 0 111 No. of meters A-Type B-Type Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Madras APS 0 0 8 0 0 0 8 2 Kaiga GS 0 1 19 2 0 0 22 TOTAL 0 1 27 2 0 0 30 (D) Lanco Kondapally Power Pvt Ltd. No. of meters A-Type B-Type Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 LKPPL 0 0 0 2 0 0 2 TOTAL 0 0 0 2 0 0 2 SRLDC 22-27 SEMs IN SOUTHERN REGION

(E) Transmission Corpn. of Andhra Pradesh Ltd. No. of meters A-Type B-Type Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Mamidipally 0 0 0 4 0 0 4 2 Kurnool 0 0 3 0 0 0 3 3 Mahaboobnagar 0 0 0 2 0 0 2 4 Vemagiri 0 0 0 6 0 0 6 5 Chittoor 400 kv 0 0 0 2 0 0 2 6 Ditchipally 0 0 0 1 0 0 1 7 Gajwel 0 0 0 2 0 0 2 8 Malkaram 0 0 0 2 0 0 2 9 Boopalapally 0 0 0 2 0 0 2 10 Tandur 0 0 0 1 0 0 1 11 Gooty 0 0 0 1 0 0 1 12 Chittoor 220 kv 0 0 0 1 0 0 1 13 Sulurpet 0 0 0 1 0 0 1 14 Araku 2 0 0 0 0 0 2 15 Upper Sileru 1 0 0 0 0 0 1 16 Lower Sileru 1 0 0 0 0 0 1 17 Kakinada 0 0 0 1 0 0 1 TOTAL 4 0 3 26 0 0 33 (F) Karnataka Power Transmission Corporation Limited No. of meters B-Type A-Type (SMLold) Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Raichur 0 0 0 5 0 0 5 2 Guttur 1 0 5 6 0 0 12 3 Nelamangala 0 4 5 0 0 0 9 4 Hoody 0 3 2 0 0 0 5 5 BTPS 0 0 0 2 0 0 2 6 JSW 0 0 0 1 0 0 1 7 Kadakola 0 0 0 1 0 0 1 8 Konaje 0 0 0 1 0 0 1 9 Sedam 0 0 0 1 0 0 1 10 Yerrandanahally 0 0 0 1 0 0 1 11 Bellary 0 0 0 1 0 0 1 12 Supa 2 0 0 0 0 0 2 13 Ambewadi 0 0 0 2 0 0 2 14 Chikkodi 0 0 0 2 0 0 2 TOTAL 3 7 12 23 0 0 45 SRLDC 22-27 SEMs IN SOUTHERN REGION

(G) Kerala State Electricity Board No. of meters B-Type A-Type (SMLold) Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Edamon(new) 0 0 0 2 0 0 2 2 Moozhiyar 0 0 0 1 0 0 1 3 Idukki 0 0 0 0 0 1 1 4 Kaniampetta 0 0 0 1 0 0 1 5 Manjeswar 0 0 0 1 0 0 1 6 Parasala 0 0 0 1 0 0 1 TOTAL 0 0 0 4 0 1 7 (H) TAN TRANSCO No. of meters A-Type B-Type Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Alamathy 3 2 1 0 0 0 6 2 S.P.Koil 0 0 0 2 0 0 2 3 Arni 0 0 0 1 0 0 1 4 Acharapakkam 0 0 0 1 0 0 1 5 Theni 0 0 0 0 1 0 1 6 Udumalpet 0 0 0 0 1 0 1 7 Uppatti 1 0 0 0 0 0 1 8 Hosur 0 0 0 1 0 0 1 9 Thiruvalam 0 0 0 0 1 0 1 10 Gummidipundi 0 0 0 1 0 0 1 11 Kuzhithurai 0 0 0 1 0 0 1 TOTAL 4 2 1 7 3 0 17 SRLDC 22-27 SEMs IN SOUTHERN REGION

(I) Puducherry Electricity Department No. of meters B-Type A-Type (SMLold) Sl.No. Location Name Total SML (new) SML(old) 2000 series 4000 series L&T SML L&T 1 Villianur 0 0 0 1 0 0 1 2 Bahur 0 0 0 1 0 0 1 3 Yanam 0 0 0 1 0 0 1 TOTAL 0 0 0 3 0 0 3 (J) Goa Electricity Department No. of meters B-Type A-Type (SMLold) Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Xeldem 0 0 0 1 0 0 1 2 Ponda 2 0 0 1 0 0 3 TOTAL 2 0 0 2 0 0 4 (K) Powergrid Sl.No. Location Name SML(old) A-Type SML (new) 2000 series No. of meters 4000 series L&T B-Type (SMLold) SML L&T 1 Gazuwaka HVDC 0 0 0 2 0 0 2 2 Kolar HVDC 0 0 0 1 0 0 1 3 Talcher HVDC 0 1 5 0 0 0 6 TOTAL 0 1 5 3 0 0 9 Total SRLDC 22-27 SEMs IN SOUTHERN REGION

(L) Central Transmission Utility (POWERGRID) No. of meters B-Type A-Type (SMLold) Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Gazuwaka 0 0 0 17 0 0 17 2 Vijayawada 0 6 6 6 0 0 18 3 Khammam 0 0 12 0 0 0 12 4 Hyderabad 0 0 0 14 0 0 14 5 Nagarjunasagar 0 0 0 13 0 0 13 6 Cuddapah 0 0 0 5 0 0 5 7 Gooty 0 0 0 9 0 0 9 8 Nellore 0 0 6 0 0 0 6 9 Warangal 0 0 0 8 0 0 8 10 Somanahalli 0 0 0 9 0 0 9 11 Munirabad 0 0 0 6 0 0 6 12 Hiriyur 0 0 5 2 0 0 7 13 Kolar 0 0 0 18 0 0 18 14 Narendra 0 2 2 2 0 0 6 15 Mysore 0 4 0 0 0 0 4 16 Hassan 0 0 0 6 0 0 6 17 Trichur 0 0 0 4 0 0 4 18 Trivandrum 0 0 4 2 0 0 6 19 Sriperumbudur 0 0 0 7 0 0 7 20 Salem 0 0 0 6 0 0 6 21 Udumalpet 0 0 0 7 0 0 7 22 Trichy 0 0 0 7 1 0 8 23 Madurai 0 0 0 7 0 0 7 24 Hosur 0 0 0 5 0 0 5 25 Thirunelveli 0 0 0 10 0 0 10 26 Pugalur 0 0 0 8 0 0 8 27 Kalivanthapattu 0 0 0 6 0 0 6 28 Karaikudi 0 0 0 6 0 0 6 29 Arasur 0 0 0 6 0 0 6 30 Pondicherry 0 0 0 6 0 0 6 TOTAL 0 12 35 202 1 0 250 SRLDC 22-27 SEMs IN SOUTHERN REGION

(M) Western Region ** No. of meters B-Type A-Type (SMLold) Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Bhadravati 0 1 3 0 0 0 4 2 Master Freq. Meter (Korba) 0 1 0 0 0 0 1 TOTAL 0 2 3 0 0 0 5 (N) Eastern Region ** No. of meters B-Type A-Type (SMLold) Sl.No. Location Name SML (new) Total SML(old) 2000 series 4000 series L&T SML L&T 1 Jeypore 0 0 0 2 0 0 2 2 Talcher HVDC 0 1 5 0 0 0 6 3 Master Freq. Meter (Durgapur) 0 0 0 1 0 0 1 TOTAL 0 1 5 3 0 0 9 ** Meters of importance to Southern Region SRLDC 22-27 SEMs IN SOUTHERN REGION

2.3 LIST OF SPECIAL ENERGY METERS INSTALLED IN SOUTHERN REGION (A) NATIONAL THERMAL POWER CORPORATION Sl. No. Location Id. Meter Sl. No CT- Ratio 1) Ramagundam STPS PT- Ratio Place of Installation Category Make 1 AP-07 NP-5542-A 500 3636 400kV side of ICT-I M L&T 2 AP-09 NP-5514-A 500 3636 400kV side of ICT-II M L&T 3 AP-11 NP-5505-A 500 3636 400kV side of ICT-III M L&T 4 AP-13 NP-5520-A 500 3636 400kV side of ICT-IV M L&T 5 AP-15 NP-4121-A 500 3636 400kV side of ICT-V M SMLnew 6 RM-11 NP-4082-A 1000 3636 400kV Bhadravati Line-I M SMLnew 7 RM-12 NP-4080-A 1000 3636 400kV Bhadravati Line-II M SMLnew 8 RM-13 NP-5541-A 1000 3636 400kV N'Sagar Line-I M L&T 9 RM-14 NP-5538-A 1000 3636 400kV N'Sagar Line-II M L&T 10 RM-15 NP-5537-A 1000 3636 400kV Gajwel Line M L&T 11 RM-16 NP-5546-A 1000 3636 400kV Hyderabad-II Line M L&T 12 RM-17 NP-5545-A 1000 3636 400kV Warangal Line M L&T 13 RM-18 NP-5536-A 1000 3636 400kV Hyderabad-III Line M L&T 14 RM-19 NP-5544-A 1000 3636 400kV Hyderabad- IV Line - M L&T 15 RM-20 NP-5512-A 1000 3636 400kV Ditchipally line M L&T 16 RM-47 NP-4078-A 1000 3636 400kV side of GT-7 M SMLnew 17 RM-49 NP-4079-A 500 3636 400kV side of TT-4 M SMLnew 18 RM-28 NP-0115-A 500 3636 400 kv side of ICT-I C SMLold 19 RM-29 NP-4120-A 500 3636 400 kv side of ICT-II C SMLnew 20 RM-30 NP-0160-A 500 3636 400 kv side of ICT-III C SMLold 21 RM-31 NP-0170-A 500 3636 400 kv side of ICT-IV C SMLold 22 RM-32 NP-0222-A 500 3636 400 kv side of ICT-V C SMLold 23 RM-21 NP-4083-A 1000 3636 400kV Bhadravati Line-I C SMLnew 24 RM-22 NP-4081-A 1000 3636 400kV Bhadravati Line-II C SMLnew 25 RM-23 NP-0212-A 1000 3636 400kV N'Sagar Line-I C SMLold 26 RM-24 NP-0216-A 1000 3636 400kV N'Sagar Line-II C SMLold 27 RM-25 NP-0111-A 1000 3636 400kV Gajwel Line C SMLold 28 RM-26 NP-0255-A 1000 3636 400kV Hyderabad-II Line C SMLold 29 RM-27 NP-0840-A 1000 3636 400kV Warangal Line C SMLold 30 RM-38 NP-0186-A 1000 3636 400kV Hyderabad-III Line C SMLold 31 RM-39 NP-0109-A 1000 3636 400kV Hyderabad-IV Line C SMLold 32 RM-40 NP-0249-A 1000 3636 400kV Ditchipally line C SMLold 33 AP-08 NP-0154-A 1000 1200 132kV side of ICT-I S SMLold 34 AP-10 NP-6160-A 1000 1200 132kV side of ICT-II S L&T 35 AP-12 NP-0237-A 1000 2000 220kV side of ICT-III S SMLold 36 AP-14 NP-0238-A 1000 2000 220kV side of ICT-IV S SMLold 37 AP-16 NP-0269-A 1000 2000 220kV side of ICT-V S SMLold Category : M- Main meter, C- Check meter, S- Standby meter SRLDC 28-46 SEMs IN SOUTHERN REGION

38 RM-01 NP-0114-A 500 3636 400kV side of GT-1 S SMLold 39 RM-02 NP-0183-A 500 3636 400kV side of GT-2 S SMLold 40 RM-03 NP-0190-A 500 3636 400kV side of GT-3 S SMLold 41 RM-04 NP-0259-A 1000 3636 400kV side of GT-4 S SMLold 42 RM-05 NP-0654-A 1000 3636 400kV side of GT-5 S SMLold 43 RM-06 NP-0230-A 1000 3636 400kV side of GT-6 S SMLold 44 RM-07 NP-0258-A 500 3636 400kV side of TT-1 S SMLold 45 RM-08 NP-0270-A 500 3636 400kV side of TT-2 S SMLold 46 RM-09 NP-0231-A 500 3636 400kV side of TT-3 S SMLold 47 SR-MF NP-0239-A Master Frequency Meter M SMLold Total no. of SEMs 47 2) Talcher STPP Stage-II Sl. No. Location Id. Meter Sl. No CT- Ratio PT- Ratio Place of Installation Category Make 1 TL-14 NP-5066-A 2000 3636 400 kv Inter connector-1 with ER M L&T 2 TL-15 NP-5076-A 2000 3636 400 kv Inter connector-2 with ER M L&T 3 TL-31 NP-4094-A 2000 3636 400 kv HVDC feeder-1 M SMLnew 4 TL-32 NP-4095-A 2000 3636 400 kv HVDC feeder-2 M SMLnew 5 TL-33 NP-4090-A 2000 3636 400 kv HVDC feeder-3 M SMLnew 6 TL-34 NP-4097-A 2000 3636 400 kv HVDC feeder-4 M SMLnew 7 TL-16 NP-5069-A 2000 3636 400 kv Inter connector-1 with ER C L&T 8 TL-17 NP-5070-A 2000 3636 400 kv Inter connector-2 with ER C L&T 9 TL-41 NP-4006-A 2000 3636 400 kv HVDC feeder-1 C SMLnew 10 TL-42 NP-4096-A 2000 3636 400 kv HVDC feeder-2 C SMLnew 11 TL-43 NP-4005-A 2000 3636 400 kv HVDC feeder-3 C SMLnew 12 TL-44 NP-4032-A 2000 3636 400 kv HVDC feeder-4 C SMLnew 13 TL-45 NP-4009-A 1000 3636 400 kv side of GT-3 S SMLnew 14 TL-47 NP-4003-A 1000 3636 400 kv side of GT-4 S SMLnew 15 TL-49 NP-4001-A 1000 3636 400 kv side of GT-5 S SMLnew 16 TL-51 NP-4068-A 1000 3636 400 kv side of GT-6 S SMLnew 17 TL-57 NP-4064-A 100 3636 400 kv side of SUT-2 (for U-3&4) S SMLnew 18 TL-59 NP-4066-A 100 3636 400 kv side of SUT-3 (for U-5&6) S SMLnew 19 TL-46 NP-4038-A 1000 3636 400 kv side of GT-3 C SMLnew 20 TL-48 NP-4004-A 1000 3636 400 kv side of GT-4 C SMLnew 21 TL-50 NP-4002-A 1000 3636 400 kv side of GT-5 C SMLnew 22 TL-52 NP-4069-A 1000 3636 400 kv side of GT-6 C SMLnew 23 TL-58 NP-4065-A 100 3636 400 kv side of SUT-2 (for U-3&4) C SMLnew 24 TL-60 NP-4067-A 100 3636 400 kv side of SUT-3 (for U-5&6) C SMLnew Total no. of SEMs 24 Category : M- Main meter, C- Check meter, S- Standby meter SRLDC 28-46 SEMs IN SOUTHERN REGION