Performance on-line monitoring device for power distribution switch cabinet lightning arrester and monitoring method thereof

Abstract

The invention discloses a performance on-line monitoring device for a power distribution switch cabinet lightning arrester and a monitoring method thereof. The monitoring device comprises a microprocessor circuit, temperature signal conditioning circuits, current signal conditioning circuits, an in-cabinet temperature signal conditioning circuit, a display circuit, a keyboard circuit, a power supply circuit, a communication interface circuit in bidirectional communication connection with the microprocessor circuit, temperature sensors, current sensors and an in-cabinet temperature sensor; the temperature signal conditioning circuits, the current signal conditioning circuits, the in-cabinet temperature signal conditioning circuit, the display circuit, the keyboard circuit and the power supply circuit are in one-way communication connection with the microprocessor circuit; the temperature sensors and the current sensors are arranged on a lightning arrester in a power distribution switch cabinet, and the in-cabinet temperature sensor is arranged in the power distribution switch cabinet; and the microprocessor circuit performs on-line monitoring and a performance judgment of the lightning arrester according to acquired monitoring data. Accurate, timely and efficient on-line monitoring of performance of the lightning arrester of the power distribution switch cabinet is achieved, and, through utilization of a total leakage current of the lightning arrester and a combination with temperature data of a body of the lightning arrester, whether a fault occurs in the lightning arrester is comprehensively determined, so safe operation of switch equipment is ensured.

Description

technical field [0001] The invention relates to a monitoring device and a monitoring method, in particular to an on-line monitoring device for arrester performance of a power distribution switch cabinet and a monitoring method thereof, belonging to the technical field of safe operation monitoring of switchgear. Background technique [0002] Power generation (substation) substations and transmission lines are high-incidence areas of lightning disasters, and whether it is direct lightning or induction lightning, it may not only cause damage to the facilities in the area, but also bring impact to external equipment connected to it (or even similar) . Therefore, before the high-voltage lines of the power system are sent to the user's own transformer, a complete set of lightning protection devices should be installed. [0003] At present, the oxide arrester is widely implemented in our country, which obviously improves the safety of the power system and produces huge economic be...

AI Technical Summary

Problems solved by technology

However, research has found that the total leakage current value of the oxide arrester cannot fully reflect the insulation condition of the zinc oxide arrester; for example, when the peak value of the resistive current increases from 50uA to 250uA, the increase of the full current may only be a few percent , and the peak value of the resistive leakage current is an important indicator that causes the heat of the arrester to reduce its insulation characteristics, and the resistive current cannot be obtained directly, so there are defects such as untimely monitoring and inappropriate judgment of the working status of the arrester.

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