Current loop monitoring system based on total station data comparison analysis

Abstract

The invention discloses a current loop monitoring system based on total station data comparison analysis. The current loop monitoring system comprises a first current sampling module; the first current sampling module is used for acquiring single current data of a single interval of a substation, and transmitting the acquired current data to a first current sampling judging module; the first current sampling judging model judges whether the acquired current data value is correct, and transmits the wrong current data value to a current sampling concentration judging device; a second current sampling module is used for acquiring two or more current data of a single interval of the substation, and transmitting the acquired current data to a second current sampling judging module, and the second current sampling judging module judges whether the acquired current data value is correct. The system compares and contrasts a first relationship and a second relationship, avoids false alarms, improves the accuracy of the alarm, and uses the current data of the whole station to perform horizontal and vertical comparison and analysis to find the fault point.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a current loop monitoring system based on the comparison and analysis of total station data. Background technique [0002] The existing secondary loop monitoring methods of current transformers include basic monitoring of secondary equipment such as protection and measurement and control, but the monitoring accuracy is low, and only the fault of the open circuit of the current loop can be detected. For example, the TA disconnection blocking method of the line protection of NARI is as follows: [0003] 1. If the self-produced zero-sequence current is less than 0.75 times the external zero-sequence current, or the external zero-sequence current is less than 0.75 times the self-produced zero-sequence current, the TA disconnection abnormal signal will be sent after a delay of 200ms; [0004] 2. If there is self-produced zero-sequence current but no zero-sequence voltage, and...

AI Technical Summary

Problems solved by technology

[0007] 1. Unable to effectively monitor the interference of the effective monitoring current loop

For example, in 2004, a 500kV main transformer malfunctioned when the line was faulty, which was caused by the interference current in the current loop and the protection malfunctioned.

But the protective device cannot correctly judge

[0008] 2. Unable to judge the shunt situation: For example, there are many times when the operator accidentally short-circuits or accidentally touches the CT secondary circuit, resulting in a sudden change in the current of the secondary circuit and resulting in a malfunction of the protection

[0009] 3. It is impossible to judge the wrong connection of CT winding: for example, a 500kV protection misuses the measurement and control winding. When the line fails, the protection malfunctions due to the saturation of the CT winding.

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