Online monitoring device for temperature of contact arms of high-voltage circuit breaker of 10-KV high-current switch cabinet

Abstract

The invention discloses an online monitoring device for temperature of contact arms of a high-voltage circuit breaker of a 10-KV high-current switch cabinet. The online monitoring device comprises a power supply conversion panel, a current transformer, a digital temperature sensor, a wireless encoding and transmitting module as well as a wireless receiving and decoding module and a temperature display and alarm device, wherein the power supply conversion panel is installed on the contact arms; the current transformer supplies power to the power conversion panel; the wireless receiving and decoding module and the temperature display and alarm device are located outside the switch cabinet; the wireless encoding and transmitting module is used for reading temperature data of the digital temperature sensor, processing the temperature data into an encoded signal and wirelessly transmitting the signal; the wireless receiving and decoding module for receiving and decoding codes is connected with the temperature display and alarm device; the power supply conversion panel comprises two high-power clamping diodes which are in reverse parallel connection with an output end of the current transformer, and a rectifier filter circuit which is in parallel connection with the output end of the current transformer; and the rectifier filter circuit is connected with a wide-voltage stabilizing circuit, consisting of a current-limiting resistor and a high-power wide-voltage stabilizing tube. According to the online monitoring device for temperature of the contact arm of the high-voltage circuit breaker of the 10-KV high-current switch cabinet, the electricity is obtained by sensing, a work power supply obtained by the device itself is stable and reliable and the uninterrupted passive power supplying for the wireless encoding and transmitting module is realized.

Description

【Technical field】 [0001] The invention relates to a monitoring device for a contact arm of a circuit breaker, in particular to an online monitoring device for the temperature of a contact arm of a high-voltage circuit breaker of a 10kV high-current switch cabinet. 【Background technique】 [0002] The monitoring of the temperature of power equipment is a very important topic being studied at home and abroad. The removable switchgear is widely used in the power supply and power consumption departments. The circuit breaker is the switchgear to ensure the safe and reliable operation of the power transmission and distribution system. One of the key components, the normal operation of the circuit breaker is related to the stability of the power system. The accident caused by the failure of the circuit breaker has been listed as one of the eighteen major anti-accident measures of the State Grid Corporation of China. The contact between the dynamic and static contact arms of the circ...

AI Technical Summary

Problems solved by technology

When the ambient temperature is too high, the presence of dust, smoke and steam will affect the temperature measurement value, and the internal equipment cannot be measured through the cabinet, so it can only be used for testing the circuit breaker installed in the fixed switch cabinet. temperature, and the removable switchgear is a closed structure, the switchgear must be closed during operation, and it cannot be measured, so it is not practical

[0005] 2. Optical fiber temperature measurement products have good electrical insulation and can isolate the high voltage in the switch cabinet. Therefore, the temperature sensor connected by optical fiber can be directly installed on the circuit breaker in the removable switch cabinet. Accurately measure the operating temperature of the contact arm of the circuit breaker in such an environment, but the optical fiber temperature measurement system is complex, the technical requirements are high, and it is not resistant to high temperature environments. The surface of the optical fiber used to isolate high voltage may be polluted by dust. The performance is reduced, which limits the application of optical fiber temperature measurement products to a certain extent. In addition, the temperature sensor adopts an active design and must use a battery. There is a risk of explosion, and it is inconvenient to install the measurement point. Can't replace the battery

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