Protective Relays, Synchronizing and Metering Sample Clauses

Protective Relays, Synchronizing and Metering. This section covers the furnishing and installation of protective relays, synchronizing and metering for the plant electrical systems and equipment. Protective relays for the switchyard will be furnished and installed by others. The Contractor shall coordinate with -------------------------------------------------------------------------------- EPC - Exhibit B -------------------- TENASKA GEORGIA GENERATION PROJECT Page 111 of 132 -------------------------------------------------------------------------------- the switchyard Contractor to ensure that protective relays for the total plant are coordinated. Protective relays shall be provided for optimum protection of the gas turbine generator, step-up transformers, station auxiliaries, and personnel in the event of electrical faults or abnormal system conditions. Protective relays for the gas turbine generators shall be provided as described in Exhibit H. The protection system shall be designed such that the protective device nearest the fault operates first, with backup protection being provided by subsequent relay stages. Selectivity shall apply to phase-to-phase and three phase, as well as to ground faults. The generator zone protection or turbine trip shall shut down the GTG and isolate them from the electric power system. Transformer differential, overcurrent protection and sudden pressure relays shall be applied to the main and auxiliary transformers. The generator and overall system protection relay devices supplied for the project shall consist of the minimum level of protection as follows: Description Function ----------- -------- Overexcitation Volts per Hertz 24 Sync Check 25 Bus Undervoltage 27B Undervoltage 27 Reverse Power or Anti-Motoring 32 Loss of Excitation 40 Negative Sequence Current 46 Transformer Neutral Overcurrent 51N Generator Ground Fault 59GN Voltage Balance 60 Bus Ground Fault 59B Generator Differential 87G Transformer Differential 87T Generator Lockout 86G Transformer Lockout 86T DC Field Ground 64 Phase Fault 51V Over/Under Frequency 81 O/U Auxiliary Power Running Trip 94AR Auxiliary Power Transformer Overcurrent 50/51 Out of Step 78 -------------------------------------------------------------------------------- EPC - Exhibit B -------------------- TENASKA GEORGIA GENERATION PROJECT Page 112 of 132 -------------------------------------------------------------------------------- Protective relays shall be electrical-mechanical or solid state type electric utility grade in indivi...
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Related to Protective Relays, Synchronizing and Metering

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