42. ©ABBGroup-42- 14-Nov-07 Busbar protection Bus bars For the 400kV and 765 kV substations that fall in this class of substations, duplication of bus bar protection is strongly recommended. It may be noted that even those 400 kV substations, which do not fall in this category initially, may become critical in future as the system grows. protection shall be integrated by the contractor and commissioned in conjunction with NEA. 11 kV Switchgear room 12 kV switchboard as described in the specification The substations shall be constructed as fully integrated turnkey packages. Associated control rooms, battery room, Other facilities required by NEA and described in the specification 3. of Control and relay Board and protection relay panels inclusive of internal wiring and with arrangement for external connection to various Switchyard equipments and Control room building equipments as necessary. Nominal System 400KV 220KV 132KV 33KV Voltage b) Highest System 420KV 245KV 145KV 36KV Voltage c) Number of Phases <----- Three supply of 400kv protection panels, 400kv low impedance bus bar protection panels, 400kv high impedance bus bar protection panels and 400kv phasor measurement system - 54 no.s *2016 j20331 132/33/11kv substation works in northern emirates. tender no. 71e/2015 fewa supply of 132kv control panels, 132kv relay insulation required. At 275kV and 400kV most circuits have one or two conductors per circuit. In order to match the ratings of high-capacity OHL circuits, very large cables will be required. Capabilities At 400kV and 275kV, EHV cables consist of a copper conductor, an insulation layer, a lead sheath and a protective plastic coating. Two different protection solutions will be given depending on which winding of the step up transformer will be considered as the main (i.e. primary or first) winding. 1 HV side of thestep-up 150mm diameter cables, made up of copper core, cross linked polyethylene insulation, seamless corrugated aluminium sheath and pvc outer sheath max. 18 cables would be needed, laid in 6 x groups of 3 separation required to allow heat to dissipate joints required every 500 - 800m (depends on cable manufacture) sealing end compounds required at … Busbar system Double busbar in incoming line and one extra transfer bus is being used .Fully numerical protection to all the line.Transfer bus can serve only in replace to one bus bar Components At incoming line Wave trapCvt (capacitive voltage transformer )Reactor (100mvar ),(for ferrenty effect)Lightning arrester (ring type structure can be PST PROTECTION CAN LET YOU DOWN Transformers (PST) [6], each rated at 600MVA, 400kV, 866A, 50Hz, ±40º with in total 64 tap positions (32 advance and 32 retard). Thus, every individual tap introduce phase angle shift of 1,25º. shall be star connected in accordance with [1,2]. The used PST protection scheme follows the protection Primary substations are associated with the power generating plants where the voltage is stepped up from low voltage (3.3, 6.6, 11, 33kV ) to 220kV or 400kV for transmitting the power so that huge amount of power can be transmitted over a large distance to load centers. 11 Primary Grid Electrical Power Substation: protection functions shall at least ensure there are no unprotected zones along the whole path of a circuit including busbars, CTs, Voltage Transformers (VTs), CBs, line trap, 181010_SOC_TOP_09.2_Best protection practices for HV EHV AC transmission system.docx. 181010_SOC_TOP_09.2_Best protecti