Transformation substation leakage current and capacitive current online monitoring management system and working method thereof

Abstract

The invention relates to a transformation substation leakage current and capacitive current online monitoring management system and a working method of the system. The system comprises a voltage sensor module, a first voltage acquisition module, a fist processor module, a current sensor module, a second voltage acquisition module and a second processor module. The voltage sensor module is used for acquiring bus voltage signals. The first voltage acquisition module is used for acquiring electric supply signals located at the bus end. The first processor module is used for calculating corresponding fundamental wave amplitude according to the bus voltage signals and the electric supply signals at the bus end so that a first phase angle of the bus voltage signals relative to the electric supply signals can be acquired. The current sensor module is used for acquiring field leakage current and capacitive current signals. The second voltage acquisition module is used for acquiring electric supply signals located in the field. The second processor module is used for calculating corresponding fundamental wave amplitude according to the leakage current and capacitive current signals and the electric supply signals located in the field so that a second phase angle of the leakage current and capacitive current signals relative to the electric supply signals can be acquired. The first processor module and the second processor module are connected with a centralized control device, and the centralized control device is used for calculating corresponding parameters of the leakage current and capacitive current signals.

Description

technical field [0001] The invention relates to an on-line monitoring device for the insulation state of capacitive equipment in a distributed substation. The device is used for on-line detection of the insulation state of the capacitive equipment and lightning arresters in the substation, and belongs to the field of on-line monitoring of high-voltage electrical equipment in substations, especially capacitive equipment. Background technique [0002] At present, the detection work of electrical equipment in substations in my country is mainly to conduct regular preventive tests in accordance with the requirements of the preventive "Test Regulations" for electrical equipment. According to the results of the test, the operating status of the equipment is judged, so as to determine whether it can continue to be put into operation. However, such a test interval is long, and a power outage is required during operation, making it difficult to diagnose faults and defects in time. ...

AI Technical Summary

Problems solved by technology

The hardware structure of this method is complex, and the anti-interference processing of the signal and the stability of the zero-crossing comparator are very demanding, and it is difficult to ensure long-term stable operation. In addition, the secondary voltage supply monitoring system of the bus PT needs to be used as a measurement reference, but The PT signal of the busbar cannot be supplied to all the on-site measurement units at the same time, and the signal line is long, and the analog signal is easily interfered by the electromagnetic field of the substation during long-distance transmission, which will cause distortion and distortion of the signal, and eventually lead to inaccurate measurement results

In the past, the sampling synchronization signal was difficult to realize at the substation site. Some of them used GPS satellite timing to allow on-site detection and sampling to perform synchronous actions. However, such a cost is high. Each on-site detection unit must be equipped with a GPS satellite module, which is unbearable for users.

[0004] The utility model patent "Distributed substation capacitive equipment insulation state online detection device" authorized announcement number CN201845069U discloses a distributed substation capacitive equipment insulation state online detection device, which also has the technical problem of synchronous sampling

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