ZXBLQ-IV MOA Energized Tester: Technical Overview

Introduction

Zinc Oxide Arresters (MOAs) are critical overvoltage protection components in 6–10kV distribution networks and medium-voltage power systems. Internal moisture ingress and aging degradation are typical failure modes that compromise their protective performance and may trigger grid faults. Traditional offline MOA testing requires scheduled power outages, which reduces power supply reliability and raises maintenance costs. The ZXBLQ-IV Zinc Oxide Arrester Energized Test Equipment enables non-intrusive, online leakage current measurement without service interruption, providing an efficient on-site solution for front-line power maintenance technicians.

System Composition and Working Principle

The ZXBLQ-IV test system consists of a dedicated high-voltage (HV) detector, sectional HV insulation rods, and a portable wireless receiver.

It adopts a clip-on current transformer (CT) with an integral measurement approach, paired with upgraded CT shielding technology to suppress on-site electromagnetic interference. The HV detector samples the leakage current from the MOA’s ground lead, and transmits real-time test data to the receiver via 433MHz wireless signal within an effective range of 30 meters. With a leakage current resolution of 1μA, the device supports high-sensitivity detection of early-stage MOA defects.

Core Technical Features

1. Uninterrupted Online Testing

The equipment fully supports live-line MOA testing with no power shutdown required, and completely resolves long-standing on-site testing difficulties for 6–10kV class zinc oxide arresters. Notably, it can perform accurate leakage current measurement even on arresters without built-in lightning counters, covering a wider range of field-installed devices.

2. High Precision and Strong Anti-Interference

With a 2 samples/second high-speed sampling rate and advanced digital signal processing technology, the tester delivers excellent electromagnetic interference immunity for complex substation and distribution site environments. It can accurately detect leakage currents as low as 10μA, with a full measurement range of AC 0.000mA to 30.00mA and automatic 50/60Hz frequency adaptation. Under reference conditions (23°C±5°C, below 80%RH), the measurement accuracy reaches ±2%±5dgt, supporting reliable online aging diagnosis of MOAs.

3. Safe and Efficient Field Operation

The tester eliminates the need for pole climbing and on-site wiring. Operators can complete full testing procedures at ground level with the matching insulation rods, which greatly improves work efficiency and guarantees personnel safety during live working scenarios.

4. Field-Oriented Practical Design

The 4-digit LCD display supports clear reading even in dark or low-light work environments.

The device stores up to 99 groups of test data, with data hold and historical data review functions for on-site record keeping.

Powered by 4 AAA alkaline batteries, it is equipped with a 5-minute auto power-off function to save energy, and triggers a low-battery reminder when voltage drops below 4.8V.

The optional battery-powered configuration adapts to field sites without mains power access.

The system features compact size and light weight: the HV detector weighs 335g, and the total weight with full insulation rods is only 2.5kg, enabling easy portability between work sites.

With drip-proof type II structural protection and 110kV/rms insulation strength per single rod, it is suitable for outdoor live-line testing scenarios.

Key Technical Specifications

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Application Value for Power Maintenance

For power system maintenance technicians, the ZXBLQ-IV energized tester provides a cost-effective tool for MOA condition screening. It avoids the economic loss and scheduling pressure caused by planned outages, and supports rapid batch inspection of distribution network arresters. By identifying early abnormal leakage current, maintenance teams can carry out targeted replacement and repair, preventing unplanned outages and improving overall grid operational reliability.

Conclusion

The ZXBLQ-IV Zinc Oxide Arrester Energized Test Equipment integrates high-precision detection, wireless data transmission and portable field design, effectively meeting the demand for online MOA condition assessment in medium-voltage power systems. Its reliable performance and user-friendly operation make it a practical technical tool for front-line power maintenance personnel.

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/