Generator Protective Relays Sample Clauses

Generator Protective Relays. Protective relay packages will be provided to minimize the effects from the following faults and malfunctions. Minimum level of protection and list of expected relay devices are noted below: o Generator phase faults. o Generator stator ground faults. o Stator open circuits and unbalanced currents. o Loss of excitation. o Backup protection for external system faults. o Reverse power. o Generator potential transformer circuit monitoring. o Underfrequency/overfrequency. o Inadvertent energization of the generator from the primary power system. Equipment furnished with the generators static excitation equipment will provide the following additional protection: o Underexcitation. o Overexcitation. o Generator field ground faults. o Excessive volts per hertz. Additionalgenerator protective monitoring equipment will be provided to protect against the following: o High-bearing temperatures. o Overspeed conditions. o Excessive vibrations. o Generator overheating. The generator protective relay packages are discussed in the following paragraphs. The functions may be part of a solid-state multifunction relay module or may be discrete relays. Primary relaying is fully duplicated per the RFP: o Generator Differential Relay (Device 87G). A generator differential relay will provide primary generator protection against three-phase and phase-to-phase faults within the generator. This relay will not detect ground faults within its zone of protection. Device 87-G1 relay will trip the generator lockout relay to remove all sources of fault current to the generator. o Generator Ground Relays (Device 59G). Device 59-N will be a low voltage pickup, overvoltage relay which will sense voltage across the generator neutral grounding transformer secondary resistor when a ground fault occurs in the generator, nonsegregated phase bus duct, generator transformer low voltage windings, or the surge protection and potential transformer equipment.