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1 Report on Industrial Visit to Power Grid 765/400 KV (GIS) Sub-Station No. of days of Visit : Two days Date(s) of Visit : 19 th September, 2017& 7 th October, 2017 Faculty In-charges : 4 Members 1. Mr.S.Ashokreddy, Asst.Prof 2. Mr.M.N.V.V.Brahmam,Asst.Prof 3. Mr. I.Srinu, Asst. Prof. 4. Mr. I.Muralikrishna, Asst. Prof. Student Co-Ordinator(s) : P. Subhash Kumar(CR) EEE-A : K. Satya Surendra (CR) EEE-B No. of Students Reporting Time Session closing Time Reporting Time Session closing Time : First Batch 66 Students IV EEE-B(2014 admitted batch) :Second Batch 72 Students IV EEE -A (2014 admitted batch) : 10:00A.M, 19 th September, 2017 (Batch-1) : 03:30P.M, 19 th September, 2017(Batch-1) : 10:00A.M, 07 th October, 2017 (Batch-2) : 03:30P.M, 07 th October, 2017 (Batch-2) Power Grid Corporation of India Limited (POWERGRID)765/400KV gas insulated Sub- Station, Surampalem authorities gave the permission for 2014admitted batch of IV year students to visit the Power Grid in two batches on 19 th September, 2017 & 07 th October, 2017and accordingly we proceeded to visit the GIS Sub-Station on above given dates from our college at 9:30 A.M along with 68 students of IV B.Tech Isem EEE-B as first batch accompanying with two Assistant Professors of EEE Department Mr. S. Ashokreddy and Mr. M. N. V. V. Brahmam,the other day from our college at 9:30 AM along with 72 students of IV

2 B.Tech I sem EEE-A as second batch accompanying with two Assistant Professor Mr. I. Srinu and Mr. I. Murali Krishna, both batches reached power grid by 09:45 A.M and met the Assistant General Manager. The Assistant General Manager permitted us at 10:00 A.M and provided three Assistant Engineers for explaining the overview and working of Power Grid and Switch-yard equipments and their functionality. Firstly they explained about the salient features of GIS power grid through a power point presentation, after that they split us into three groups facilitated by three Assistant Engineers and take us to total switch yard and substation Automation control Room. They explained about all the essential components of the 765KV/400KV substation. Also, they explained about SCADA and various programming done in the control room i.e., PLC control. Finally we checked out at 3:30 P.M after through observation of the Gas insulated Sub-Station and we came back to college at 3:40 P.M AN OVER VIEW OF THE POWER GRID 765/400KV GIS SUBSTATION: The following details were observed during the visit. The first thing which we observe in the GIS substation is electrical equipments: Power Transformers ( ICTs),Circuit breakers, Shunt & Bus Reactors, Line Reactors, Reactive compensation, Instrument Transformers, Isolators, Lightning / Surge Arrestors,Wave traps, Control panels,protection & Relay panels, P.L.C.C Equipments, Control & Power cables, Substation Automation, Fire Fighting equipment s and Auxiliary supplies: D.C. Supply- Battery & Battery chargers, D.G Sets,A.C & D.C panels / switch Boards. The increasing demand of electrical power in cities and industrial centers necessitates the installation of compact and efficient distribution and transmission network. High voltage gas insulated switchgear (GIS) is ideal for such applications. The range of application of SF₆ Gas Insulated Switchgear extends from voltage ratings of 72.5kV up to 800kV with breaking currents of upto 63kA, and in special cases upto 80kA. Both small transformer substations and large load-centre substations can be designed with GIS technology. The distinctive advantages of SF₆ Gas Insulated Switchgear are: compact, low weight, high reliability, low maintenance and long life. Extensive in-plant preassembly and testing of large units and complete bays reduces assembly and commissioning time on the construction site.

3 GIS equipment is usually of modular construction. All components such as busbars, disconnectors, circuit-breakers, instrument transformers, cable terminations and joints are contained in earthed enclosures filled with Sulphur Hexafluoride gas (SF₆). SF 6 acts as insulation between live parts & the earthed metal closure. Capacitor Voltage Transformers convert transmission class voltages to standardized low and easily measurable values, used for metering, protection and control of the high voltage system. Additionally, Capacitor Voltage Transformers serve as a coupling capacitor for coupling high frequency power line carrier signals to the transmission line. Lightning Arresters or Surge Arresters are always connected in Shunt to the equipment to be protected; they provide a low impedance path for the surge current to the ground. Line trap also is known as Wave trap. It traps Hi-frequency communication signals sent on the line from the remote substation and diverting them to the telecom/tele protection panel in the substation control room (through coupling capacitor tele protection panel in the substation control room(through coupling capacitor and LMU). Transformers are provided with many types of protections like differential protection, trip coil protection, trouble alarm protection, oil protection, PRV protection, OLTC protection, winding temperature protection, on-load tap changing, over flux, under voltage, HV/LV, E/F protection etc. Relay is used to sense the signals and these signals are send to Circuit Breaker at faulty condition. Relays used in the substation of Distance relays, Buchholz relay etc. Distance Relays are provided for distance protection at feeders. Buchholz relays are present in between the transformer main tank and the conservator tank. These relays are used for transformer protection. About The Company POWERGRID, A Navratna Public Sector Enterprise, is one of the largest transmission utilities in the world. POWERGRID wheels about 45% of the total power generated in the country on its transmission network. POWERGRID has a pan India presence with around77,000 Circuit Kms of Transmission network and 124 nos. of EHVAC & HVDC sub-stations with a total transformation capacity of 89,000 MVA.POWERGRID has also diversified into Telecom business and established a telecom network of more than 21,000 Kms across the country.

4 POWERGRID has consistently maintained the transmission system availability over 99% which is at par with the International Utilities. Vemagiri area in Andhra Pradesh has huge potential of Gas based generation projects due to availability of Gas in Krishna-Godavari basin. In this regard, 4 nos. of IPP generation projects with total installed capacity of about 5400MW have been granted LTA for quantum of 5150 MW. In view of above consideration the huge generation potential in this area a comprehensive transmission system has been planned so as to take care of the evacuation needs of generation projects of Vemagiri area. For this a 765/400 KV pooling station at vemagiri (GIS) is to be established through LILO of Gazuwaka Vijayawada S/c with bypass arrangements. All the power from different power plants will be pooled at Vemagiri pooling station shall be further dispersed through high capacity transmission corridors of 2xD/c 765 KV lines towards Hyderabad via Khammam to supply target beneficiaries in Southern region. Angul-Srikakulam pooling station 765 kv D/C line is connected to Vemagiri Pooling Station and charged at 765 kv. At Vemagiri Pooling Station this power is stepped down to 400 kv and connected to Gazuwaka and Vijayawada through LILO of existing Gazuwaka-Vijayawada S/C line at the Vemagiri Pooling Station. Presently, the flow on this line Angul-Srikakulam Pooling Station 765 kv D/C is MW and the line is in use. The grid is under construction for future expansion to connect a line from chilakalurpeta.

5 Co-ordinators HOD-EEE

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