1.0 Scope. 2.0 Codes and Standards

Transcription

1 Table of Contents 1.0 Scope Codes and Standards Site Conditions General Requirements Technical Requirements Protection, Alarm, Control, Indication and Metering Requirements Reliability Fault Diagnostic Unit Tests and Acceptance Packing and Dispatch... 14

2 1.0 Scope This specification shall be used in conjunction with the purchase documents, Technical Particulars cum Data Sheet, and Key Single Line Diagram establishes the minimum requirements for design, engineering, manufacturing, testing at works and delivery in well packed condition and commissioning of Static UPS system along with the following major equipment. Rectifier / Charger Batteries Static inverter Electronic static switch and regulated transformer (where specified) in bypass circuit. Manual maintenance bypass switch. Metering, protection equipment and annunciation, synchronizing equipment & all logics. Outgoing feeders / Distribution boards as specified elsewhere. 2.0 Codes and Standards 2.1 The equipment shall comply with the latest editions and addenda of following relevant BIS specifications (IS) / IEC / BS specifications. Where IS codes are not available the relevant IEEE/IEC shall apply. IEC 146 Semiconductor Converters IS 3700 IS 3715 IS 4411 IS 5001 IS 5469 IEC IEC IS IS 2959 IS IS 7204 IS 2147 IS IS 1248 IS IS BS 4417 (IEC 146) IS 8623 (IEC 439) IS 694 (IEC 228) BS 9720 Essential rating and Characteristics of semiconductor devices Letter symbols for semi conducting devices Code of designation of semi conducting devices Guide for preparation of drawings for semiconductor devices Code of practice for the use of semiconductor junction devices Semiconductor converters; general requirements and line commutated converters. Secondary cells and batteries containing alkaline or other non-acid electrolytes - Vented nickel-cadmium prismatic rechargeable single cells Vented type Ni - Cd batteries Contactors for voltage not exceeding 1000V AC or 1200V DC Solid State inverters run from storage batteries Stabilised power supplies DC output Degree of protection provided by enclosure for low voltage switchgear and control gear LV Fuse Direct acting indicating analogue electrical measuring instruments and their accessories LV Switchgear and Controlgear Specification for control transformers for switchgear and control gear for voltages not exceeding 1000V AC Semiconductor rectifier equipments. Factory built assemblies of switchgear & control gear for voltages up to & including 1 kv and 1200V DC PVC insulated cables for switchgear and control gear wiring Custom built transformers and inductors of assessed quality.

3 IS2208 & IS9224 Cartridge fuses for voltages up to & including 650V. BS 2709 (IEC 119) Electrical performance of semiconductor rectifiers IS 5 Painting This list does not claim to be complete. The SUPPLIER is responsible for the complete and proper application of any relevant IS/IEEE/IEC/BS standard. 2.2 The equipment shall also conform to the Indian Electricity Rules and other statutory regulations currently in force. 2.3 In case of any contradiction between the standards listed in 2.1 and this specification, the requirements laid down in this specification shall prevail. 3.0 Site Conditions The UPS system shall be designed to operate under the conditions specified in the datasheet. If not specifically mentioned therein, a maximum ambient temperature of 50 deg. C, average relative humidity 100% and an altitude less than 1000mtr above MSL, atmospheric pollution aggressive, Dusty, pre-dominantly presence of fibre, cold dust, urea dust, ash etc. shall be taken into consideration. 4.0 General Requirements 4.1 UPS Requirement: i. UPS shall be used to feed : 115V AC, 50Hz, 1 phase (for Instrumentation load) parallel redundant power supply. The UPS shall be IGBT type and is backed up by nickel-cadmium (Ni-Cd) battery rated for 30 minutes. ii. The UPS system consists of the following : a) Duplicated sets of rectifiers and inverters. b) Servo Controlled Voltage Stabilizer (SCVS) in by-pass line. c) Ni-Cd battery banks (separate bank for each inverter). d) AC Distribution Board. iii. Each set of rectifier and inverter shall be rated at least 25% more than the peak load requirement. iv. Each battery bank shall be rated to feed UPS load for 30 minutes at rated capacity of the UPS. v. The UPS shall be fed from two feeders of emergency PMCC. vi. MODE OF OPERATION The mode of operation of this UPS shall be parallel redundant. If one inverter fails, the entire load shall be fed by the second inverter and vice versa shall be < 1ms (without interruption). If both the inverters fail simultaneously, the load will be transferred to SCVS and vice versa shall be within allowable frequency band, through static switch without interruption. The Servo Controlled Voltage Stabilizer (SCVS) shall work as a bypass source.

4 vii. UPS design is PWM based using IGBT. Each charger and SCVS has isolating transformer at the input. viii. The salient features of the UPS shall be as under: High Efficiency Compatible to feed nonlinear, high crest factor loads Microprocessor based monitoring system for UPS status and fault indications. High transient performance Low audible noise ix. UPS is provided with a static / power switch (with make before break type switch arrangement) so that in case of failure of any UPS it can be taken in Bypass / Maintenance mode. Under maintenance mode, complete power and control section shall get isolated and maintenance / trouble shooting of faulty UPS can be done without affecting the functioning of other healthy UPS and load. x. There is a provision of alarm and fault log on the LCD based display. All controls of UPS like ON, OFF, Bypass etc. are made possible through keypad. All electrical parameters like input and battery current, input and battery voltage, load current, battery status etc. are available on this LCD display. xi. Each UPS shall be provided with dedicated IBM compatible PC and compatible software so that all the parameters of UPS and alarms / faults can be logged into the computer through RS 485 port. These logs / trends of load can later be printed on dot matrix printer supplied with this PC. xii. The transfer time of UPS from inverter to bypass (SCVS), in case of failure of both inverters, is so selected that during this transition period, instrumentation / DCS etc. (which leads to tripping of plant) does not fail. xiii. Running load on UPS shall not exceed 70% of rated capacity of UPS at any time. xiv. The technical parameters of this UPS are as under: Input Rated Voltage : 415V + 10% (3 phase) Rated Frequency : 50Hz + 5% Output Rated Voltage : 115 V AC Voltage Regulation : Static (0-100% load) + 1% Dynamic for 100% load change : + 5% Regulation Time : Less than 25 msec Transient (for 100% load change) : + 5% During normal start up and voltage interruption during short circuit, the input voltage may be subject to transient voltage dip of 10% of normal voltage. Any other equipment / accessories not specifically mentioned herein, but necessary for completeness and satisfactory performance of the system, shall be provided. The UPS shall be suitable for indoor use. All components shall be of a quality and reliability that satisfies the requirements of a secure AC power to vital equipment performance, controlling, monitoring and safe guarding function in continuously operating petro-chemical process units, petroleum refineries, gas processing facilities and utility installation.

5 Components shall be capable of withstanding the thermal and dynamic stresses resulting from internal and external short circuits and circuit switching operations etc. The design of the UPS shall be such as to minimize the risk of short circuits and shall ensure personnel and operational safety. The vendor shall be responsible for design, engineering and manufacturing of the complete system to fully meet the intent and requirements of the specification and attached data sheets / drawings. UPS battery shall be Ni-Cd dual redundant type (2x100% rating) i.e. each UPS shall have individual battery. 5.0 Technical Requirements Each rectifier shall be designed for simultaneously feeding complete inverter load and float / rapid charging of the battery to its rated capacity within 10 hours. Each rectifier shall be equipped with automatic On Line as well as manual charging facility. The overload capacity & current limiting shall be adequate for the application. Harmonic filters if required shall be considered at input side. The facility for uninterrupted manual transfer in either direction through static switches shall also be provided. 5.1 UPS Design and Performance Requirements i. Incoming AC supply shall be converted to DC through heavy duty phase controlled Thyristors/IGBT rectifiers. The rectifiers shall operate according to the constant voltage current limiting principle and shall incorporate a soft start feature to gradually accept load on initial energizing. ii. iii. iv. The UPS system including the stabilized bypass shall be galvanically isolated from input and output power supply system by providing double / triple wound transformers (with proper shielding). All transformers shall be natural air cooled, dry type suitable for location inside panel. All rectifiers shall also have a triple wounded transformer at its input. Adequate transformer protection shall be provided. Protection device design shall consider the transformer inrush current. The RF filter shall be provided at the input and output of UPS to suppress radio frequency interference to permissible limits as specified in IS/IEC. Transient and surge protection circuit shall be provided in the output circuit of rectifiers to protect the UPS from surge and voltage spikes. Transients and surges on the mains input shall not result in tripping of rectifier unit or the initiation of battery discharge. v. The UPS shall be designed to draw power from the mains supply at a minimum power factor of 0.8 while working at rated load in normal operating UPS configuration. The vendor shall furnish variation of power factor when load varies from no load to full load. Also vendor has to size the UPS main and bypass feeders required on the basis of UPS rating. vi. vii. viii. ix. The UPS shall be provided with automatic sequence and power walk in circuit(s) with adjustable time delay up to 15 sec. such that the rectifiers and inverters can start operating automatically when incoming AC power is restored ensuring the UPS to be loaded automatically. Facility shall be provided to enable testing of rectifier independently without disconnection of inverter. Facility for initial charging of batteries shall also be provided. The inverters shall be disconnected during initial charging of the battery. Batteries shall be indoor, stationary, Ni-Cd pocket plate type as specified in data sheet. Unless specified otherwise in the data sheet, Ni-Cd battery of pocket plate type (positive plate). Plastic cell containers and fully insulated connector technology will be preferred. The

6 plastic cell containers shall be non-flammable, shock resistant and translucent, giving a visual indication of electrolyte level. x. Ampere hour of the battery shall be selected based on the following: xi. xii. xiii. xiv. xv. xvi. xvii. xviii. xix. xx. xxi. a) Minimum design temperature shall be as defined in the data sheets. b) Discharge duty cycle. c) End cell voltage of 1.14 V. d) Ageing factor of 0.8 The rectifiers / chargers shall be designed to completely charge the battery in a maximum time of 10 hours after complete discharge. Facilities shall be provided to initiate battery rapid charge operation by Manual & Automatic means for (1) conditions when power resumes after power failure and (2) under normal running of UPS. An auto charging sequence shall be provided for the rapid and float charging based on current sensing. In addition to above, the charging shall be transferred from rapid to float mode after a preset time adjustable through 0-24 hours timer. The rectifiers shall be sized based on the minimum inverter input load when inverter is delivering its rated output at 0.8 p.f lagging and recharge the battery to its nominal rated capacity. The DC load imposed by the inverters shall be considered under the worst case where only one rectifier is operating but the UPS load is equally shared by all the inverters. The rating of each rectifier shall be not less than the value calculated as follows: For Nickel Cadmium Batteries = min. Inverter input current AH The DC rectifiers shall sense the battery charging current and adjust the DC bus voltage to maintain the charging current to preset Level-A separate current control circuit shall also be provided for adjustment of battery current. The rectifiers shall be protected against reverse battery connection at DC link voltage bus. Subsequent to a discharge cycle when battery is connected to rectifier, the battery current shall be monitored, controlled and limited to set value automatically irrespective of the inverter input current. The battery may be taken out of service for maintenance during which period it shall be possible for the inverter to continue operation by drawing power from the rectifier. Ripple content at the DC link shall not exceed 3% even with battery disconnected. Battery shall be provided with a sensitive earth leakage protection relay for alarm purpose only. The inverter shall operate satisfactorily for variation of DC bus voltage from fully discharged condition of the battery to rapid charge voltage of the battery with Inverter output load current waveform having a relative harmonic content varying between 0 and 50%, the latter waveform having a crest factor not exceeding 2.5. Variation of load power factor shall be within 0.6 lag to 1.0 when varying from no load to full load condition. The UPS system shall be able to operate satisfactorily on rated loads (in KVA) with power factors in the range of 0.6 lag to 1.0, if not specified otherwise in the Data Sheet. Vendor shall furnish a graph showing the effect of variation in load power factor on UPS output parameters. The rated efficiency of the UPS system shall not be less than 85% at rated load and 0.8 pf. The UPS shall have the capacity to deliver a minimum output of 125% for 10 minutes and 150% for 10 seconds if not specified otherwise in the Data Sheet. The UPS shall be provided with current limiting circuit to avoid excessive loading beyond its permissible overload withstand capability. The inverters shall be phase locked to the stabilized bypass power supply as long as stabilized bypass supply frequency remain within +/- 6% of nominal.

7 When bypass supply frequency variation exceeds the above limits the inverters shall be delinked from mains. Free running frequency tolerance limit shall not exceed +/- 0.1%. Resetting / setting frequency band shall be 0.1 Hz. Meters shall also be provided for adjustment of synchronizing frequency from 1% to 6% in steps of 0.5%. xxii. xxiii. Unless otherwise specified, the voltage variation shall not exceed +/- 10% and complete recovery to normal steady state shall be within 0.1 sec. The above requirement shall be complied for following transient disturbances: a) 100% step load and unload (for hot stand by only) b) 50% step load c) Momentary interruption in power supply d) Load transfer to stabilized bypass supply e) Complete load transfer to other healthy inverter when one of the two parallel inverters develop a fault. The stabilized bypass supply shall have a continuous current rating equivalent to the rated output of the UPS unit and shall be capable of conducting a current ten times the rated output for the duration more than the fault clearing of the type of fuse / MCB provided. The load transfer devices may comprise either continuous rated static elements in both inverter and stabilized bypass supply or continuous rated electro-mechanical switching devices with short time rated static elements. xxiv. xxv. There shall be three number of Manual switch (two position ON & OFF) at the Output of UPS 1, UPS 2 and Bypass & located at final output i.e. after Static Switch & MCB s of respective inverters & Bypass modules. Switch is required to Connect / Isolate the distribution Panel. Suitable number and configuration of adequately rated static switches must be provided in the inverter(s) output and stabilized bypass supply to ensure positive isolation of faulty inverter section such that the other inverter and bypass circuits do not feed into the fault leading to under voltage / trip. The short time rating of all the static switches shall be at least 10 times the rated output for the duration more than the fault clearing time of the type of fuse / MCB provided. xxvi. Facility shall be provided to manually and automatically initiate transfer of the load from inverters to the stabilized bypass supply and manually from stabilized bypass supply to the inverters. Under voltage and over voltage sensing levels to initiate transfer shall be adjustable. The maximum transfer time between inverters and bypass supply shall not exceed 4 msec. and 20 msec. in synchronous and asynchronous mode respectively. xxvii. xxviii. (a) (b) When the manual maintenance bypass switch (MBS) is operated, it shall be possible to feed all critical loads from standby power source, while providing complete isolation to UPS and static switch. This shall ensure operator safety during maintenance. It shall be possible to test UPS operation without affecting critical loads, when MBS is operated. The criteria for automatic load transfer from inverter to the stabilized bypass supply shall be as follows: The load transfer shall only be possible when - The stabilized bypass output voltage is within +/- 5% of rated UPS output voltage and - The mains bypass frequency is within +/- 6 % Auto-transfer of the load from inverter to stabilized bypass supply shall be initiated when - The inverter output voltage drops below 95% of the nominal output voltage under steady state condition. The transfer shall be accomplished before the inverter voltage falls below 90% of the nominal value under transient conditions. OR

8 (c) xxix. xxx. xxxi. xxxii. xxxiii. xxxiv. xxxv. xxxvi. xxxvii. - The inverter output voltage exceeds 105% of the nominal output voltage under steady state condition. The transfer shall be accomplished before the inverter voltage reaches 110% of the nominal value under transient conditions. OR - The inverter output current exceeds its tolerable limits. The following transfer & retransfer operations shall be provided by static bypass switch (SBS) - Uninterrupted transfer to standby power initiated by output overload, DC voltages out of limits, over temperature. - Transfer to reverse power with 20 msec delay when the inverter & standby power source are not synchronized, in order to avoid damage to loads due to phase reversal. - Uninterrupted manual transfer to standby power shall be initiated from control panel. - All no break transfer & retransfer shall be inhibited when, voltage of inverter or standby power is out of limits, or frequency synchronization is out of limits. Conditions of Synchronization of Inverter(s) with By Pass (A) No Synchronization is required with Bypass supply when two inverters are running in parallel. (B) Synchronization is required with By-pass supply only when one Inverter running. All breakers shall be adequately rated for continuous rating as well as breaking capacity as applicable. Paralleling of breaker / switch / contactor poles to achieve the required current rating is not acceptable. All output isolating device shall be double pole type. MCB s / ACB s shall be provided for each outgoing feeder of the UPS. The rating shall be selected to achieve co-ordination with downstream devices to protect the UPS during short circuit. The rating of the largest branch circuit shall not exceed 25% of the system rating. All electronic power devices including thyristors, transistors, diodes etc shall be rated under operating conditions for approximately 200% of the maximum current carried by the device. All other electrical components such as transformers, reactors, breakers, contactors switches, bus bars etc shall be rated for at least 125% of the maximum required rating. No electronic device shall be subjected to PIV greater than 50% of its rated value. All the thyristors, diodes and other electronic devices of the UPS shall be protected with high speed semiconductor fuses. I 2 t co - ordination characteristics between fuse and semi conducting power devices shall be furnished. The outgoing circuits of ACDB shall be protected by MCB s / ACB s. Each inverter shall be designed to clear a fault in any of the branch circuit s up to a maximum rating of 25% of the system capacity without assistance of the stabilized bypass supply. In case of any fault in branch circuits, the load connected to the healthy circuits shall not get affected. The fault clearing time shall be less than 4msec. All PCBs shall be provided with a transparent epoxy coating environmental protection and tropicalisation. They shall be suitably located away from heat sources. All electronic control and monitoring printed circuit cards shall be suitable for easy replacement. Monitoring points shall be provided on each of the PCBs and the PCB shall be firmly clamped in position so that vibration or long usage does not result in loose contacts. All PCBs shall be placed in a manner to avoid replacement of a PCB by a wrong spare PCB. Failure of each PCB shall be indicated by visual alarms. Visual fault diagnostics shall preferably identify faults upto various sections in the card. UPS shall have forced air cooling & having non-metallic complete fan body & mounting structure. Tripping of cooling fan doesn't interlock with the running of UPS. However, temperature rise shall be interlocked with the running of the UPS. Forced ventilation of panel, if provided, shall be supplemented by 100% redundant fans. In normal operation, normal and redundant fans shall run together. The power supply for the fans shall be tapped from the inverter output. However, the rating of the UPS as specified in the Data Sheet shall be the net output of UPS after deducting power consumption for fans etc.

9 xxxviii. The fans shall be located to facilitate removal of faulty fan for maintenance without taking system shutdown. Maximum noise level from UPS system at 1 meter distance, under rated load with all normal cooling fans running, shall not exceed 75 db. 5.2 Construction i. Rectifier / charger and inverter, stabilized bypass supply and static switch sections shall be suitably housed in sheet steel panels complete with all interconnections. The panels shall be fabricated with 1.6 mm thick for doors and covers and 2 mm thick for frame from cold rolled sheet steel and structural steel. ii. iii. iv. The panels shall be floor mounting, free standing type, single front end type, fitted with suitable louvers for ventilation and cooling fans as required. Hinged doors shall be provided at the front and back with dust tight gaskets. Inter panel sheet steel barriers shall be used. The enclosure shall provide minimum IP 52 degree of protection, if not specified otherwise in the data sheet. The maximum and minimum operating height of the switches shall be 1800 mm and 300 mm respectively. Power cables up to 10 sq mm shall be Copper and 16sq mm and above shall be Aluminum and Control cables shall be multi cores of solid copper conductor. All cable entries shall be from bottom, if not specified otherwise in the Data Sheet. A removable bolted gland plate shall be provided along with Rolled Aluminum heavy duty double compression cable glands for external cable connections. Clamp type terminals shall be used for connection of all wires upto 10 sq. mm. Bolted type terminals suitable for cable lugs shall be provided for wire size above this. Bus-bars shall be color coded and live parts shall be shrouded to ensure complete safety to personnel intending routine inspection by opening the panel doors. Panels shall have suitable name plate and device tag numbers as per the schematic diagram. All wires shall be ferruled and terminals shall be numbered. v. All power and control switches shall be rotary type, mounted inside and shall be operable by opening the door. Space heater and suitable cubicle illumination shall be provided in each panel. All instruments shall be digital, flush mounted. Separate test terminals shall be provided for measuring and testing of the equipment to check the performance. vi. vii. viii. ix. A suitably sized earth bus shall be provided at the bottom of the panels, including ACDB running through the panel line up, with provision for each connection at both ends to Owner s main earth grid. The minimum size of earth bus shall be 25 X 3 sq. mm copper. All potential free metallic parts of various equipments shall be earthed suitably to ensure safety. All panels shall be of same height so as to form a panel line up which shall have good aesthetic appearance. Minimum size of power cable shall be 2.5 sq mm. Control cables shall be multi cores of 2.5 sq.mm solid copper conductor. However, wiring in the panel / switchboards may be by means of 1.5 sq mm solid Copper cables except CT wiring, which shall be 2.5 sq mm. x. All control wiring shall be encased in plastic channels having removable covers. Each wire shall be identified at both ends by PVC ferrules. Ferruling of wires shall be as per relevant IS. xi. All metal surfaces shall be thoroughly cleaned and de-greased to remove mill scale, rust, grease, dirt, etc. Fabricated steel structures shall be pickled and then rinsed to remove any trace of acid. The outside surface of all equipment shall be painted after suitable pretreatment by the application of two coats of rust and corrosion resisting epoxy based paints. The under - surface shall be made free from all imperfections before undertaking the finishing coat.

10 xii. xiii. After preparation of under -surface, the panels shall be spray painted with two coats of epoxy - based final paint or shall be epoxy powder - coated. The color / shade of the final paint shall be as per data sheet. Spray - painted finished panels shall be dried in stoving ovens in a dust free atmosphere. Panel finish shall be free from imperfections like pinholes, orange peels, runoff paint etc. 115 V UPS supply for Instrumentation shall be un-grounded /grounded neutral type. If UPS supply neutral is grounded the separate grounding electrode shall be provided apart from UPS body & protection earthing. The neutral earthing shall in no way be connected to the body/protection earthing. xiv. Battery isolator box shall be provided near the battery bank for maintenance of the batteries. 5.3 Battery Accessories The battery shall be complete with all accessories and devices including but not limited to the following (for each battery): i) Hydrometer (Syringe Type) 3 Nos. ii) Thermometer 3 Nos. iii) Cell Testing Voltmeter (3V-0-3V) 1 No. iv) Rubber Gloves 4 Pairs v) Spanner 1 No. vi) Acid Resistant Jugs And Funnels 2 Nos. Each vii) Wall Mounting Teakwood Holder 1 No. viii) Acid Alkali Jars 5 No. ix) Mixing Jars 5 No. x) Bolt Connectors Wrench 3 No. xi) Cell Lifting Straps 5 No. xii) 2 Kg Petroleum Jelly 5 No. xiii) Rubber Apron xiv) Cell Insulators xv) Rubber Syringe For Tapping Cells xvi) Clamp On Type Digital Miltimeter (AC / DC) 2 Nos. With Each Battery Bank With Each Battery Bank With Each Battery Bank 5.4 AC Distribution Board i. UPS and ACDBs shall be separate units. ii. iii. iv. Sheet steel enclosed (thickness frame 2.00 mm & doors and covers 1.6 mm) AC distribution board shall be provided as part of the complete UPS package. They shall accommodate AC feeders as indicated in the Data Sheet. The distribution board shall be floor mounted, fixed type with compartmentalized construction, having horizontal and vertical bus - bars. All bus bars shall be made of Electrolytic grade Tinned Copper and shall be provided with heat shrink sleeves. It shall be possible to operate the switches without opening the doors. Switches shall be provided with door interlocks. v. Vertical cable alley shall be provided for the termination of outgoing cables. Suitable supports shall be provided for supporting incoming and outgoing cables.

11 vi. vii. viii. ix. 20% spare outgoing feeders for future use shall be provided in each ACDB for each rating and type of feeder. All outgoing switches shall be air insulated load break type. UPS ACDB shall have ACB / MCCB s at Incomer and MCB s at all outgoings feeders of suitable rating as per load requirement. While deciding the ratings of these, co-ordination shall be checked with upstream and downstream breakers. Cable entry shall be from bottom. The degree of protection shall be IP Protection, Alarm, Control, Indication and Metering Requirements If not specified otherwise in the Data Sheet, following schedule shall be followed for alarm, control, indication and annunciation. Any additional devices / features considered necessary for reliable purpose of this item / operation and maintenance shall also be included in various panels and same shall be highlighted separately. An illuminated one line diagram indicating operational status shall be provided on the front of the panel in the active MIMIC. In addition to this Analog & Digital meters for all modules I/C Module: AC Voltmeter and Ammeter, Charger Module: Voltmeter, Ammeter and Frequency Meter, Inverter Module: Voltmeter, Ammeter and Frequency Meter and By-Pass Module: Voltmeter, Ammeter and Frequency Meter shall be provided. 6.1 Protection Protection for rectifier / charger units shall comprise as a minimum: AC side Under-voltage / over-voltage Mains failure DC side (including battery system protection) Over-voltage Under voltage Earth fault Internal faults Faults shall be indicated on LCD- display Protection for inverter unit shall comprise as a minimum: DC side Over-voltage Under-voltage AC side Over voltage Under voltage Current limitation Overload Internal faults Transformer protection shall be as per SUPPLIER standard if required. 6.2 Metering for following sections / circuits: Rectifier Circuits a) Incoming line voltages b) Input line currents c) DC voltage at each rectifier output d) DC current at each rectifier output e) Battery current for rapid and float charging / discharging Inverter Circuits

12 a) DC input current at each inverter b) AC voltage at each inverter output (AC voltage for 3 phase inverter with V SS ) c) AC current at each inverter output (AC currents for 3 phase inverter with A SS ) d) Frequency meter at each inverter output Stabilised Bypass Supply a) Frequency meter for incoming supply b) Voltmeter with selector switch for incoming supply c) Ammeter with selector switch for incoming supply ACDB Following shall be provided for each of the ACDB incomers: a) Voltmeter b) Ammeter 6.3 Indications for following circuits / sections a) AC mains ON -Rectifier b) AC mains ON -Bypass Rectifier (for each Rectifier) a) Rectifier output ON b) Battery on float charge c) Battery on rapid charge d) Rectifier Fault. e) Rectifier Failure. f) Disconnected Battery Bank. Inverters (for each inverter) a) DC input ON b) Load on inverter c) Inverter synchronized with mains d) Inverter Failure. Static switch inhibited (on account of poor quality of bypass supply) 6.4 Audio-visual Alarm (complete with Accept / Reset / Test facilities) separately for each circuit a) Mains failure b) Battery charge failure c) Battery Low Voltage. d) Battery High Voltage. e) Inverter high temperature f) Low voltage from inverter g) Inverter bypassed h) Inverter overloaded i) Static switch faulty j) All power fuse failures k) Load on bypass 2 Nos. changeover contacts shall be wired to the terminal strip, 1 No. for common remote alarm of UPS fault in owner s panel and 1 No. for load on stabilized bypass supply annunciation. 4-20mA signals of UPS current and voltage for each UPS module for remote monitoring.

13 6.5 Controls a) All the switches for starting, shut down and testing sequence b) Primary input circuit breakers for feeding chargers, bypass line and DC bus c) Inverter ON / OFF switch ( to initiate inverter operation) d) Static switch transfer test Push Button 6.6 User Menu / set points A keypad driven user menu shall contain at least the following a) Choice of language (for overseas makes) b) Bypass static switch control c) High rate charge command d) Selection of automatic high rate charge e) Battery discharge test f) All voltage, current, PF and protective settings including calibration data shall be digitally stored in a non-volatile memory. Different password levels shall be there for accessibility 7.0 Reliability a) All necessary care shall be taken in selection, design, manufacturing, testing and commissioning of the equipment for ensuring high system reliability. Vendor shall furnish the value MTBF, MTTR and Availability Factor. The above figures shall be substantiated by tests and field results. Following design consideration shall be taken into account to ensure maximum availability of the system. b) There shall be no common device, between main and redundant units (eg. Master oscillations etc.) In order to ensure that the failure of the same does not cause shutdown of more than one unit. c) It shall be possible to bring out any individual power circuit for maintenance without affecting the total UPS supply. d) Series parallel combination of smaller devices to achieve specified rating shall not be acceptable. e) All the components used shall be time tested and standardised. Vendor shall state the safety factors used in selecting such items as semiconductors, electrolytic capacitors, transformers etc. Vendors shall quote their nearest higher size that will meet the requirement of the specified UPS rating. f) UPS shall have dual redundant communication ports for communicating the status of breakers/ switches, alarms, faults etc in the UPS system to remote. g) The hardware, including control circuitry of the UPS, shall be suitable for temperatures and other adversities that will occur during UPS operation including overload. Burn-in tests under full load and overload conditions shall be carried out to minimize the possibility of early component or system failures and to prove the UPS design. The manufacturer shall provide test evidences to confirm that the minimum MTBF of individual component of UPS at 30 degree centigrade shall be at least for 100,000 hours. The design of the UPS shall be such that MTTR shall be minimized by the use of self diagnostic and monitoring features, with clearly labeled removable control cards. The manufacturer shall maintain complete spare parts program and service support for at least 20 years. 8.0 Fault Diagnostic Unit Each UPS set shall have provision for adding microprocessor based on- line fault diagnostic unit. This shall supervise the UPS operation continuously. It shall identify and locate faults immediately

14 so that corrective action can be taken. The software shall be provided on CD ROM drive. The fault diagnostic unit shall have provision for following minimum facilities: a) Automatic print out facilities for time, input / output voltages, currents, frequency under the following conditions UPS power source changeover from mains to battery UPS power source changeover from battery to mains Changeover from one inverter to other inverter Changeover time in case of inverter to stabilized bypass supply and from one inverter to other inverter Printout in case of UPS failure Output voltage and current waveform of UPS Type of failure incident along with diagnostic report b) In addition to the above, any other feature which vendor feels may be useful shall be provided and highlighted separately. 9.0 Tests and Acceptance 9.1 Testing of UPS shall be done in accordance with relevant Indian/ IEC codes. 9.2 The bidder shall submit the certificates of type tests performed on identical equipment as evidence of the compliance of the equipment with the type tests. 9.3 The bidder shall submit the certificates of routine and acceptance tests conducted on the purchased equipments. 9.4 All routine/ acceptance tests shall be performed at the manufacturer s works in the presence of Owner s representative. 9.5 The Owner / Purchaser or their representative shall be allowed to visit the manufacturing works for stage inspection during manufacturing stage. 9.6 The Bidder shall intimate the Owner / Purchaser 4 weeks in advance of the tests and submit the detailed schedule of tests Packing and Dispatch All the equipment shall be divided into several sections for protection and ease of handling during transportation. The equipment shall be properly packed for transportation by ship / rail or trailer. The panels shall be wrapped in polythene sheets before being placed in crates to prevent damage to finish. Crates shall have skid bottom for handling. Special notations such as Fragile, This side up, Centre of gravity, Weight etc shall be clearly marked on the package together with Tag Nos. P.O. Nos. etc. The equipment may be stored outdoors for long periods before erection. The packing should be suitable for outdoor storage in areas with heavy rains / high ambient temperature. All spares should be packed in separate wooden boxes and shall not be mixed up with main items which are being dispatched from vendor works. The packing list for spares should be strictly followed at the time of dispatch of spares. The one copy of packing list should be pasted on the wooden box and another copy should be kept in the box along with spares.