A voltage and current double monitoring lightning arrester action counter and method

Abstract

The invention discloses a lightning arrester action counter capable of monitoring voltage and current and a counting method. The counter comprises a voltage transformer, a current transformer, a sensor signal conditioning circuit and a counting circuit. The voltage transformer and the current transformer respectively detect voltage change and current change of grounding lead before and after an action of the lightening arrester, and send detection signals to the sensor signal conditioning circuit. The sensor signal conditioning circuit is used for carrying out shaping and filtering on the detection signals, and then transmitting the shaped and filtered detection signals to the counting circuit. The counting circuit counts the number of parameter features, meeting a preset condition, of fluctuation signals of the voltage and the current so as to obtain the frequency of the action of the lightening arrester. The parameters of voltage on two ends of the lightening arrester and discharging current of the lightening arrester are used as counting and judging basis, so the voltage change and the current change can be mutually confirmed, the accuracy of the counting is greatly improved and missed counting and mistaken counting are reduced.

Description

technical field [0001] The invention relates to an action counter and a method for a voltage and current double monitoring lightning arrester. Background technique [0002] The traditional surge arrester operation counter needs to disconnect the lightning protection ground wire and connect a valve R (non-linear resistor) in series. When the arrester operates, the discharge current flows through the valve R, and a voltage drop U will be generated on R. This voltage The drop U is used to drive the electromagnetic counter at the back to count the actions of the arrester. [0003] There are three deficiencies in this arrester action counter: [0004] 1. The series entry of the valve piece R reduces the flow capacity of the grounding wire and increases the residual voltage of the arrester; [0005] 2. It is necessary to disconnect the grounding down conductor, which is inconvenient to install and use, and there are risks in construction; [0006] 3. The counting criterion is t...

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Problems solved by technology

[0005] 2. It is necessary to disconnect the grounding down conductor, which is inconvenient to install and use, and there are risks in construction;

[0006] 3. The counting criterion is too simple, susceptible to external interference, and the reliability and accuracy are not high

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