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PROTECTIVE RELAY, AND METHOD AND PROTECTIVE RELAY SYSTEM FOR ESTIMATING TIMING TO ZERO RESIDUAL MAGNETIC FLUX
PROTECTIVE RELAY, AND METHOD AND PROTECTIVE RELAY SYSTEM FOR ESTIMATING TIMING TO ZERO RESIDUAL MAGNETIC FLUX
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机译:用于估计零剩余磁通量的定时的保护继电器以及方法和保护继电器系统
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摘要
PROBLEM TO BE SOLVED: To prevent malfunction by breaking a main transformer so that the residual magnetic flux of the iron core of the main transformer may be settled within a given zero range, when a protective relay outputs a trip signal and breaks the main transformer from a power system. ;SOLUTION: A protective relay has a system input means 1 which measures the primary voltage V1 and current 11 and the secondary voltage V2 and current 12 of a main transformer 1, and outputs output signals 11-14. This has a protective relay operating circuit 2 which detects the accident of a power system or inside a transformer with the data 11-14 of the system input means 1, and outputs trip signals 21. A forecasting circuit 5 forecasts the timing to zero the residual magnetic fluxes of the iron core of the main transformer with the data 11-14 of the system input means 1. A logical circuit 3 takes the AND of the trip signal 21 of the protective relay operating circuit 2 and a magnetic flux forecast signal 55 of the forecasting circuit 5, and outputs a trip signal 31. Therefore, the residual magnetic flux of the iron core of the main transformer is settled within the specified zero range.;COPYRIGHT: (C)1997,JPO
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