Capacitor intelligent device and monitoring method thereof

Abstract

The invention provides a capacitor intelligent device and a monitoring method thereof. The device comprises a voltage sensor, a current sensor, a temperature sensor, a multi-channel analog-to-digital (AD) conversion device, a transmission module and a user background analysis and diagnosis system. The monitoring method comprises the following steps of: sampling a voltage signal, a current signal and a temperature signal of a single capacitor by using the voltage sensor, the current sensor and the temperature sensor respectively; transmitting the signals to a multi-channel AD converter; and transmitting the signals to a host computer by using the wired or wireless transmission module. Thus, on-line monitoring of voltage, current, capacitance and temperature of the single capacitor can be realized, namely when a fault takes place in the single capacitor, the voltage and the current at the two ends of the capacitor vary and can be discovered by working personnel in the host computer for early warning.

Description

technical field [0001] The invention belongs to the technical field of power system equipment, and more specifically relates to an on-line monitoring and protection device and method for a capacitor compensation device. Background technique [0002] Capacitor is a kind of power system equipment, which is mainly used for capacitive reactive power compensation provided to the power system. [0003] Generally, capacitors are used in groups. Depending on the capacity of the entire group and the capacity of the unit, the number required for each group is also different, ranging from a few units to hundreds of units. [0004] At present, the monitoring of capacitor devices in the market is the unbalance monitoring between phases or single-phase segments of the whole group of capacitors, and there is no monitoring for a single capacitor, that is, when one or several capacitors in the whole group of capacitors are partially or completely damaged. , The protection device disconnects...

AI Technical Summary

Problems solved by technology

[0004] At present, the monitoring of capacitor devices in the market is the unbalance monitoring between phases or single-phase segments of the whole group of capacitors, and there is no monitoring for a single capacitor, that is, when one or several capacitors in the whole group of capacitors are partially or completely damaged. , the protection device disconnects the switch, and the maintenance personnel should measure the capacity of each capacitor according to the actual situation, judge whether each capacitor is good or bad, and replace it after finding the damaged capacitor

[0005] The above detection work can only be carried out after the capacitor is damaged, the relay protection of the device is activated, and the switch trips, and the damage degree of the faulty capacitor cannot be accurately judged on site. Normal operation of power system equipment

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