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Lightning protection counter
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  • Lightning protection counter

Lightning protection counter

1. Product introduction The LHJCQ3A-485 arrester online monitor is the latest design of the lightning arrester monitor with RS485 long-distance communication function. It can remotely transmit the full leakage current, resistive current, discharge frequency and discharge time of the arrester. The resistive current of the arrester can be measured by the external reference voltage to improve the measurement accuracy of the resistive current.

Category: Product Center

Key words: equipment


Product Description

1. Product introduction
The LHJCQ3A-485 arrester online monitor is the latest design of the lightning arrester monitor with RS485 long-distance communication function. It can remotely transmit the full leakage current, resistive current, discharge frequency and discharge time of the arrester. The resistive current of the arrester can be measured by the external reference voltage to improve the measurement accuracy of the resistive current.
2, monitoring principle
The leakage current in the MOA porcelain sleeve contains a capacitive component and a resistive component, mainly the fundamental component, and contains a rich harmonic component in addition to the fundamental component, which is caused by the nonlinear characteristics of the MOA. The main feature of whether the arrester is normal is to judge whether it is within the normal range. Therefore, the main task of the monitoring device is to extract the fundamental wave from the full current. Under normal conditions, its resistive current is much smaller than the capacitive current, so the full current is mainly expressed as capacitive current. The third harmonic analysis method is used to measure the third harmonic component in the leakage current. Since the MOA has good nonlinearity, when the MOA degradation causes the third harmonic component to increase rapidly, the MOA can be judged by judging the third harmonic component. The health of the situation.
3, product selection table
No. Model Voltage level, specification
1 LHJCQ3A-10/600 10KV, 1mA / 35KV, 2mA
2 LHJCQ3A-10/800 110KV,220KV, 3mA
3 LHJCQ3A-20/2000 500KV, 6mA