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A SYSTEM FOR DIFFERENTIAL CURRENT PROTECTION INCLUDING HARMONIC RESTRAINT AND BLOCKING FOR A POWER TRANSFORMER
A SYSTEM FOR DIFFERENTIAL CURRENT PROTECTION INCLUDING HARMONIC RESTRAINT AND BLOCKING FOR A POWER TRANSFORMER
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机译：电力变压器差动电流保护系统，包括谐波约束和闭锁
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摘要
The invention relates to a system for differential current protection including harmonic restraint and blocking for a power transformer comprising a means for developing a differential current value (16) from processed winding values which are representative of current transformer (CT) secondary current values obtained from the windings of a power transformer means for developing an operating current value (44) from said differential current value; means for developing a restraining current value (62) from said processed winding current values means for obtaining at least one even harmonic value of said differential current value (32). Means for comparing (54) the sume (76) of the restraining current value (62) and the even harmonic values (82) with the operating current value and for producing an output signal (87R1) which in turn emerges as useful in producing a trip signal when the operating current value is larger than said sum.
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