Technical Analysis of ZX-MOA Lightning Arrester Leakage Current Tester

Introduction

Metal Oxide Arresters (MOAs, also named lightning arresters) are core overvoltage protection components in power systems, which suppress transient overvoltage to safeguard transmission lines, transformers and other critical equipment. The DC reference voltage (U1mA) and leakage current under 0.75 U1mA are two key parameters to evaluate the insulation status and aging degree of zinc oxide arresters. The ZX-MOA Lightning Arrester Leakage Current Tester is a specialized instrument developed for detecting these two indicators, providing efficient, accurate and reliable testing solutions for power testing technicians.

Core Features & Working Principle

1. Automatic Measurement with High Efficiency

The tester adopts a closed-loop adjustment control mechanism to guarantee the precision of 1mA current and 0.75 times DC reference voltage. With a built-in microcomputer to manage the full measurement process, the instrument can automatically complete the test of 1mA DC reference voltage and leakage current under 0.75 U1mA for zinc oxide arresters with one button press. The whole testing cycle takes only about 15 seconds, which significantly improves work efficiency and is highly applicable for batch measurement in substation commissioning and periodic maintenance.

2. Integrated Compact Structure

This device integrates a high-voltage power supply module, measurement unit and control system into a single chassis. With all components concentrated in one enclosure, it has the advantages of small volume and light weight, reduces the transportation burden for on-site testing, and adapts well to various complex working environments of power facilities.

3. Optimized Design with Simple Connection

Benefiting from special process design for internal circuits and external interfaces, the tester features simple and clear wiring operation. It lowers the operational difficulty for field personnel, reduces the risk of wiring errors in high-voltage scenarios, and further ensures the safety of operators and the reliability of test results.

Key Technical Indicators

The main performance parameters of the ZX-MOA tester cover measurement range, accuracy and environmental adaptability, as specified below:

Voltage measurement range: 0–30kV, 0–60kV or 0–120kV for option, suitable for MOA testing of different voltage levels

Current measurement range: 0–2000μA

Voltage measurement accuracy: ±1%

Operating ambient temperature: 0℃ ~ +40℃

Relative humidity: ≤85% (at 25℃)

Altitude limit: < 1000m

Power supply: 220V±10% AC, 50±1Hz, compatible with standard on-site power supply of power systems

Application Significance for Power Maintenance

For front-line power testing technicians, the ZX-MOA tester effectively solves the pain points of traditional MOA DC characteristic tests, such as complex operation, long time consumption and high manual intervention. Its automatic measurement mode reduces human-induced errors, and the portable integrated design meets the demand of mobile testing across multiple work sites.

Regular MOA performance testing with this instrument helps technicians identify potential defects including internal dampness, valve plate aging and insulation degradation of arresters in time. It supports early elimination of hidden dangers, avoids power accidents caused by arrester failure, and effectively improves the operational reliability of transmission and distribution networks.

Conclusion

The ZX-MOA Lightning Arrester Leakage Current Tester combines high measurement accuracy, high automation and excellent portability. It is a practical and reliable special test tool for power equipment maintenance personnel, providing strong technical support for condition evaluation, routine maintenance and fault diagnosis of metal oxide arresters in power systems.

 GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/