Residual voltage free large-through-flow lightning arrester monitor detection device for extra-high voltage engineering

Abstract

The invention discloses a residual voltage free large-through-flow lightning arrester monitor detection device for extra-high voltage engineering, comprising a lightning arrester, wherein the lightning arrester is grounded through a conducting wire, the middle of the conducting wire is disconnected, when the lightning strikes the lightning arrester, the voltage can break through an open circuit atthe middle of the conducting wire, so that the conducting wire is connected, the monitor device further comprises a lightning arrester monitor, the lightning arrester monitor is provided with a powersupply, the power supply is connected with a capacitor through a rectifier circuit and charges the capacitor, the capacitor is connected in series with a counter, a thyristor is connected to a loop between the capacitor and the counter, a gate pole of the thyristor is connected to the conducting wire through the induction coil, the anode and the cathode of the thyristor are respectively connectedwith the capacitor and the counter, when current passes through the conducting wire, the induction coil induces the current and electrifies the gate pole of the thyristor so as to trigger the thyristor to act, and the capacitor discharges the counter, so that the counter acts.

Description

technical field [0001] The invention belongs to the technical field of monitoring equipment detection for lightning arresters, and in particular relates to a detection device for lightning arrester monitors with no residual voltage and large flow current used in UHV projects. Background technique [0002] The monitor for surge arresters with no residual voltage and large flow current (referred to as JCQ(W) type monitor) has the characteristics of no residual voltage, large flow current, and high precision. It does not need an external power supply when working. It is suitable for high-voltage AC power grids. Gapless metal oxide surge arresters with continuous current (full current) greater than 0.2mA (effective value) have been widely used in UHV substations. Because it is different from traditional surge arrester monitors in terms of composition and working principle, it cannot be tested by traditional test methods. [0003] The arrester monitor is composed of a discharge ...

AI Technical Summary

Problems solved by technology

In the monitor with no residual voltage and large current surge arrester, the operating condition of the discharge counter not only needs to simulate the external high voltage of the lightning strike, but also needs to provide the working current to charge the internal capacitor of the monitor, so the above test method cannot meet the operating conditions of the discharge counter; the leakage current meter A high-impedance current loop is used, and the general current calibration device cannot inject current, so an additional large-capacity current calibration device is required for testing, and additional equipment must be carried during the test

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