Zinc Oxide Arrester Tester
The Zinc Oxide Arrester Tester (also known as Resistive Current Tester, MOA Live Line Tester) is the core detection equipment for daily inspection and preventive testing in substations. It is mainly used to measure parameters such as total current, resistive current and its harmonics, capacitive current, power loss, and phase difference of zinc oxide arresters, thereby accurately determining whether the valve discs are damp, aged, or deteriorated. It is a key instrument for ensuring power grid lightning protection safety.
Core Working Principle
During normal operation, a zinc oxide arrester mainly carries capacitive current. When the valve discs become damp or aged, the resistive current component increases significantly. The core task of the tester is to accurately separate the resistive current from the total leakage current.
Mainstream technical routes include:
Technical Route Principle Advantages Applicable Scenarios
Compensation Method (Fundamental Wave Method) Collect PT secondary voltage as reference, calculate resistive current fundamental wave through phase difference Strong anti-interference, high precision, mainstream solution 110kV and above substations
Third Harmonic Method Measure third harmonic current to deduce resistive current Suitable for gapless MOA Specific types of arresters
Current Method (No PT Mode) Set angle or calculate voltage reference through software algorithm No PT wiring required, convenient operation No PT signal or quick troubleshooting
Currently, the compensation method is the industry standard solution. Combined with digital filtering and Fourier harmonic analysis technology, it can effectively eliminate system harmonics and on-site electromagnetic interference.
Selection Core: Match by Voltage Level and Testing Scenario
1. Voltage Level and Precision Requirements
Application Scenario Recommended Type Precision Requirement
Daily inspection of 35kV and below distribution stations Total current type or basic resistive current type ±5% is sufficient
Preventive testing of 110kV～220kV substations Resistive current type (supports fundamental wave separation) ±2%～±5%
500kV and above/UHV stations Harmonic analysis type (supports 3rd～9th harmonics) Within ±2%, with edge phase correction
Electric Power Research Institute arbitration/metrology calibration High precision type ±0.5%～±1%
Key Tip: 110kV and above substations must choose resistive current or harmonic analysis type. Total current type cannot capture early insulation deterioration signals.
2. Synchronization Method (Determines On-site Efficiency)
Wired Synchronization (PT Secondary Side) Directly take reference voltage from PT secondary terminals Highest precision, most stable Requires wiring, limited distance (≤40m)
Wireless Synchronization Voltage collector wirelessly transmits reference signal No long-distance wiring required, safe and efficient Transmission distance needs to be ≥1000m to be practical
Induction Plate/Electric Field Induction Non-contact induction of electric field to obtain voltage Completely wiring-free, most convenient Slightly lower precision, susceptible to electric field distribution
No PT Mode (Current Method) Software algorithm calculates voltage reference Usable when no PT signal Lowest precision, only for quick troubleshooting
Large substations or outdoor stations should prioritize wireless synchronization (transmission distance ≥1000m). Indoor compact stations can choose wired synchronization.
3. Number of Channels
Single Channel: Phase-by-phase testing, low cost, suitable for small stations
Three-channel Synchronization: Complete three-phase measurement with one wiring, efficiency improved by over 60%, and equipped with automatic inter-phase interference compensation function, essential for 110kV and above stations
Parameter Item Conventional Model High-end Model
Total Current Range 0～20mA 0～30mA (expandable)
Resistive Current Range 0～10mA 0～20mA
Voltage Acquisition Range 0～250V 0～500V
Current Measurement Accuracy ±5% reading ±1 digit ±2% reading ±5μA
Voltage Measurement Accuracy ±2% reading ±1 digit ±2% reading ±0.2V
Harmonic Analysis Order 3rd～7th 3rd～9th
Wireless Transmission Distance 30～400m 1000～5000m
Data Storage 200～500 sets Over 1000 sets
Unit Weight 5～7kg ≤1kg (handheld)
Battery Life 6～8 hours Over 8 hours
Essential Function Checklist (Hard Procurement Indicators)
Resistive current fundamental wave separation: Must support. Measuring total current alone cannot determine valve disc deterioration
Automatic inter-phase interference compensation: Essential for 220kV and above stations, solves edge phase measurement deviation
Compatibility with multiple synchronization methods: Support at least two of wired + wireless + induction
Three-phase simultaneous measurement: Complete ABC three-phase testing with one wiring, greatly improving efficiency
Harmonic analysis: Support at least 3rd～7th harmonics, high-end models support 3rd～9th
Data export and report generation: Support USB drive export to Word/Excel, with PC software
Built-in lithium battery: Battery life ≥6 hours, meeting full-day on-site operations
Anti-interference design: Digital filtering + hardware shielding, stable readings in strong electromagnetic environments
Real-time waveform display: Color touch screen, voltage and current waveforms displayed on the same screen
Local and Mainstream Manufacturer Resources
Based on past selection experience, Jiangsu (especially the Yangzhou Baoying area) is the core industrial belt for domestic power testing instruments and electric heating equipment. The zinc oxide arrester tester field also gathers a large number of manufacturers. When procuring, prioritize local industrial belts, which have significant advantages in after-sales response and logistics costs.
Arrester resistive current tester, supports three-phase simultaneous measurement, color touch screen, USB data export, suitable for daily preventive testing of 10kV～220kV substations.
KE-MOA zinc oxide arrester tester, supports wired/wireless/induction three synchronization methods, built-in lithium battery with 8-hour battery life, outstanding cost-effectiveness.
SE-MOA series, 7-inch color screen, supports 3rd～9th harmonic analysis, with inter-phase interference compensation, suitable for 220kV and above stations.
GDYZ-203/301A series, wired + wireless dual synchronization, wireless transmission distance over 1000m, three-channel simultaneous measurement, total current accuracy ±3%, qualified supplier of State Grid/China Southern Power Grid, exported to over 90 countries.
Adopts high-speed magnetic isolation digital sensor, accuracy ±2%, supports three-phase simultaneous measurement and automatic compensation, continuous operation over 8 hours, outstanding cost-effectiveness.
Dual-frequency signal acquisition + adaptive filtering algorithm, leakage current detection error ≤±0.5mA, supports 10kV～500kV detection, main unit weight 5kg, anti-interference capability recognized in outdoor detection scenarios.
: IP67 protection rating, -40℃～+70℃ wide temperature operation, integrates IoT and AI technology for remote diagnosis, market share over 60% in extreme scenarios such as plateau photovoltaics/desert wind power.
: Nearly 30 years of R&D experience, HRSL-300/301 series, supports high-voltage direct sampling (no PT), used by hundreds of large power plants and power bureaus nationwide.
MEYB-BS series, wireless transmission distance 1500m (optional 5000m), 8-inch full touch color screen, supports 485 wired/wireless/no-voltage three synchronization methods.
HZYHX-V series, 7-inch color screen, voltage acquisition 0～500V, current 0～30mA, wide range, suitable for 500kV and above stations.
Products have passed CNAS test reports from Kapp Testing Research Institute. After-sales provides 24-hour online response, 2-hour remote troubleshooting, and 48-hour on-site service within the province.
Executive Standards
DL/T 987-2005: General Technical Conditions for Zinc Oxide Arrester Resistive Current Testers
DL/T 474.5-2006/2018: Guide for Implementation of On-site Insulation Tests—Arrester Tests
DL/T 596-1996/2021: Preventive Test Code for Electric Power Equipment
GB 11032: AC Gapless Metal Oxide Arresters
Usage Precautions
PT secondary side wiring must be equipped with a fuse (0.1A) to prevent misoperation from damaging the PT
The arrester grounding down conductor must be reliably connected, and the current clamp clamping position must be secure
Maintain a safe distance during live testing, prioritize wireless mode, reduce high-voltage leads
Pay attention to phase sequence during three-phase testing. Incorrect wiring will cause phase difference calculation errors
Confirm the arrester counter is normal before measurement. Abnormal counters will affect current acquisition
Enable anti-interference mode in strong electromagnetic environments, and take multiple measurements for averaging if necessary
After testing, remove the current line first, then the voltage line, to prevent induced voltage from causing injury
