Voltage channel sampling anomaly detection method of transformer substation relay protection device

Abstract

The invention discloses a voltage channel sampling anomaly detection method of a transformer substation relay protection device. The method comprises steps of S1-S8. The scheme is used for detecting arelay protection device in a transformer substation. Whether the voltage collected by a feeder device is normal or not is detected by comparing the voltage collected by the feeder device with the voltage collected by a PT measurement and control device, and therefore whether the feeder device works normally is judged. The process of detecting whether the voltage acquired by the PT measurement andcontrol device is normal is set in the scheme, so that the detection accuracy is improved. According to the scheme, comparison is carried out according to line voltage, and two typical wiring modes of PT star wiring and delta wiring are considered.

Description

technical field

[0001] The invention relates to the technical field of substation relay protection, in particular to a voltage channel sampling abnormal detection method of a substation relay protection device. Background technique

[0002] After the substation relay protection device has been in operation for a long time, the sampling circuit may be abnormal. In particular, the collection of voltage channels is directly related to the operation of the standby automatic switching device and the operation of the compound voltage blocking current protection logic. The voltage sampling circuit generally includes: voltage transformers, filter resistors, operational amplifiers, A / D chips, etc. Any abnormality of any device will cause abnormal sampling data, which is characterized by the following characteristics:

[0003] (1) The sampling raw data is all 0 or very small, which will cause the voltage vector calculation to be too small, or 0 or zero drift;

[0004] (2) The sample...

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