Zinc oxide arresters are crucial overvoltage protection devices in the power system, and their operational conditions directly affect the overall safety and stability of the power grid. After long-term operation, the internal valve plates of the arresters are prone to performance degradation due to factors such as moisture and aging. Therefore, it is necessary to regularly verify key operating parameters using professional detection devices. Specialized detection equipment can accurately collect core data such as the DC reference voltage and leakage current of the arresters, providing effective support for the assessment of the equipment’s health status.
Instrument Types and Technical Characteristics
Based on application scenarios and wiring forms, related detection devices can be classified into three categories:
DC Parameter Tester
Suitable for power-off maintenance conditions, it can complete offline detection of arresters in laboratories and substations.
The equipment is small and lightweight, easy to carry, and equipped with a fully automatic measurement mode. The operation process is simple; routine items can be completed within a short time for the full measurement of DC reference voltage and leakage current at 0.75 times the voltage, mainly used for preventive regular tests and factory quality inspections of arresters.
Live Testing Instrument
No equipment power-off operation is required; it can directly conduct on-site detection of arresters on energized operating lines. By analyzing the full current and resistive current data, the health condition of the equipment can be determined.
It can truly reflect the working state of the arresters under actual operating voltages, avoiding the problem of inability to replicate the actual conditions in offline testing and difficulty in discovering potential hazards. It is mainly used for online monitoring and power-off maintenance work.
Wireless and Three-Phase Simultaneous Measurement Type
Suitable for the detection of three-phase arresters groups and complex electromagnetic environment on-site conditions, integrating multiple advanced detection technologies.
It has the ability to wirelessly synchronize data collection, eliminating the need for long-distance wiring in the field; supports simultaneous measurement of three phases, significantly improving the efficiency of detection operations; built-in professional anti-interference programs and automatic angle compensation algorithms can effectively shield electromagnetic interference in the field, ensuring the accuracy of measurement results, especially suitable for work sites where voltage transformers are difficult to obtain power supply and electromagnetic interference is strong.
Core Measurement Parameters
The detection equipment comprehensively evaluates the operating performance of zinc oxide arresters through multiple key parameters:
Full Current: The total leakage current flowing through the arresters, used to reflect the overall insulation level of the equipment.
Resistive Current: The active component of the full current, is the core basis for judging moisture and valve plate aging of the equipment.
Capacitive Current: The reactive component of the full current, can assist in judging the working performance of the valve plates.
Phase Angle: The phase difference between voltage and current, mainly used for converting the resistive current component.
DC Reference Voltage: Specifically, the corresponding voltage under 1mA DC current condition, used to determine whether the valve plates are aging or deteriorating.
Harmonic Content: Covers multiple harmonic components of voltage and current, used to analyze the impact of grid harmonics on the operation status of the arresters.
Resistive Current is the most sensitive indicator for determining the health status of the arresters. Once the equipment is affected by moisture or valve plate aging, the resistive current value will significantly increase, requiring maintenance personnel to pay close attention and take timely measures.
Post time: May-13-2026