Self-inspection circuit and self-inspection method of signal acquisition loop of vacuum degree monitoring device

Abstract

The invention discloses a self-inspection circuit and a self-inspection method of a signal acquisition loop of a vacuum degree monitoring device, which belongs to the technical field of online monitoring of electrical equipment, and includes a vacuum degree monitoring device and a self-inspection device connected to a core processing unit circuit of the vacuum degree monitoring device unit; the self-test unit includes a self-test button, a reset button, a self-test control relay, an alarm control relay, an optocoupler, a high-pass filter circuit, and a sensitivity adjustment circuit. Both the self-test button and the reset button are connected to the self-test control relay, and the self-test control The relay, the alarm control relay, the optocoupler and the alarm control module are connected in sequence, the self-check control relay controls the pulse generation module to send a pulse signal, the pulse signal enters the pulse counting module through the high-pass filter circuit and the sensitivity adjustment circuit, and the signal of the pulse counting module and the alarm control module connect. The invention can verify the effectiveness of the vacuum degree online monitoring system of the vacuum circuit breaker, avoid false alarms and missed guarantees, and ensure the reliability of power supply.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of electrical equipment, in particular to a self-inspection circuit and a self-inspection method of a signal acquisition loop of a vacuum degree monitoring device. Background technique [0002] The modern production process of vacuum circuit breakers can guarantee the service life of the vacuum interrupter to about 15 years. Temperature drop is one of the common electrical failures of vacuum circuit breakers, which has long threatened the safety of the power grid operation. The problem of real-time monitoring of the vacuum degree of the vacuum interrupter of the medium voltage vacuum degree circuit breaker has always been a hot topic of research by scholars at home and abroad. [0003] The on-line monitoring system for vacuum degree of vacuum circuit breaker designed based on the principle of high-frequency discharge pulse detection uses the metal plate antenna sensor installed next to...

AI Technical Summary

Problems solved by technology

In view of the signal perception and intelligent alarm effectiveness of the vacuum degree online monitoring unit of the vacuum circuit breaker during operation, it is necessary to design the self-test function of the device to realize regular self-test to ensure the effectiveness of the vacuum degree online monitoring system itself, so as to avoid online monitoring False alarms and leaks occur in the system. False alarm signals will trouble the operation and maintenance personnel, causing unnecessary power outages and maintenance, affecting the reliability of power supply. The role of the online monitoring system itself

[0004] None of the existing on-line vacuum monitoring devices for vacuum circuit breakers has a self-checking function. For example, the patent document with the publication number CN103413721 A discloses an online vacuum monitoring system for vacuum circuit breakers, which includes three-phase vacuum interrupters and separate induction stations. An electric field probe that describes the phase angle information of each phase of the vacuum interrupter, and also includes a control circuit connected to the electric field probe, and the control circuit performs vector summation on the phase angle information sensed by each of the electric field probes and then sends the into the central control mechanism; the patent document with publication number CN 109029837 A discloses a vacuum degree monitoring system for vacuum circuit breakers, including a front-end monitoring module, a signal amplification module, a rectification and filtering module, a central control module, a fault alarm module, and a data setting module , the human-computer interaction interface and the signal transmission module, the front-end monitoring module is connected to the vacuum circuit breaker, the front-end monitoring module includes a microwave generation unit, a signal acquisition unit and a noise acquisition unit, the signal acquisition unit is connected to the rectification and filtering module, and the rectification and filtering module is connected to the central The control module and the central control module are respectively connected with the microwave generation unit, the noise collection unit, the fault alarm module, the data setting module and the man-machine interface

The vacuum degree monitoring system of the vacuum circuit breaker disclosed in the above two patent documents does not have a self-check function, and cannot ensure the effectiveness of the vacuum degree on-line monitoring system itself, and there are cases of false alarms and leaks, which affect the reliability of power supply

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