Online detection system and online detection method for isolating switch

Abstract

The invention relates to an online detection system and an online detection method for an isolating switch. The system comprises a motor operating mechanism, the isolating switch and an online detection device, wherein the motor operating mechanism comprises a motor; the online detection device comprises a detection module, a conversion module, a switch and a centralized control terminal; the detection module is used for acquiring detection analog signals of the motor operating mechanism and the isolating switch; the detection analog signals comprise a temperature analog signal, a displacement analog signal and a switching value analog signal of the isolating switch and a current analog signal of the motor; the conversion module is used for finally converting the detection analog signals into detection optical signals and transmitting the detection optical signals to the centralized control terminal; and the centralized control terminal carries out centralized control on the received detection optical signals. The system and the method of the invention meet the intelligent power grid construction requirements by the state grid, and the safety, the reliability and the anti-interference performance are good.

Description

technical field [0001] The invention relates to the field of intelligent power grids, in particular to a system and method for on-line detection of an isolating switch. Background technique [0002] Isolating switch, commonly known as "knife switch", generally refers to a high-voltage isolating switch, that is, an isolating switch with a rated voltage of 1kV and above. [0003] According to the different voltage levels of the substation, the operating modes of the isolating switch operating mechanism are roughly divided into the following situations: Before 2003, the main knife and ground knife of the isolating switch of 500Kv and above were all electric and could be operated manually. Box operation, the main knife of the 220Kv isolating switch adopts electric and manual electric operation, the ground knife adopts manual operation, the main knife and the ground knife of the isolating switch with a voltage level of 110Kv and below are both manually operated, and the operating...

AI Technical Summary

Problems solved by technology

[0003] According to the different voltage levels of the substation, the operating modes of the isolating switch operating mechanism are roughly divided into the following situations: Before 2003, the main knife and ground knife of the isolating switch of 500Kv and above were all electric and could be operated manually. Box operation, the main knife of the 220Kv isolating switch adopts electric and manual electric operation, the ground knife adopts manual operation, the main knife and the ground knife of the isolating switch with a voltage level of 110Kv and below are both manually operated, and the operating mechanism of the above isolating switch cannot be realized Centralized control cannot meet the requirements of the State Grid for building an intelligent grid

[0004] The isolating switch is not a key device in the primary equipment of the substation, and the control and detection of the isolating switch have not received sufficient attention. In order to meet the requirements of the State Grid for building an intelligent grid, the provincial bureaus have carried out some modifications to the isolating switch, including The manual operating mechanism of the isolating switch is changed to an electric operating mechanism, but there is no unified technical requirement. The modified isolating switch cannot fully meet the requirements of the intelligent substation, and there are potential safety hazards. The specific performance is as follows:

[0005] 1. The isolating switch requires unattended operation. Its switch status and operating conditions are judged by the switch value. The switch value is connected to the measurement and control unit in the centralized control room through the control cable, and then transmitted to the background. If the control cable insulation problem occurs, it may Cause the occurrence of false opening or false closing of the main switch and the ground switch of the isolation switch. Since the isolation switch does not have the function of breaking the load, this will cause serious damage to the safety of the power grid.

[0006] 2. The contact condition of the conductive part of the electrically operated isolating switch still requires inspection personnel to regularly go to the site to measure the temperature, and the degree of online monitoring has not been realized

[0007] 3. After the electric operation isolating switch is operated by remote control, it is necessary to arrange on-site inspection personnel to verify the closing and opening of the switch.

[0008] 4. None of the existing isolating switches has the function of detecting the closing and opening current of the isolating switch

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