Zinc Oxide Arrester Tester
The Zinc Oxide Arrester Tester (also known as Arrester Resistive Current Tester, Intelligent Arrester Characteristics Tester) is a precision instrument specifically designed to detect the electrical performance of zinc oxide arresters (MOA). It is widely used in live-line inspections of substations, outage maintenance, and laboratory acceptance tests. It can promptly identify dangerous defects such as internal insulation moisture and valve plate aging, making it a key device for ensuring the safe operation of power grids.
Core Working Principle
Under normal operating voltage, zinc oxide arresters primarily conduct capacitive current. When the arrester's internal components become damp or the valve plates age, the resistive current component significantly increases. Monitoring only the total current often masks early insulation defects. The core principle of this tester is to accurately separate the fundamental and harmonic components (such as 3rd to 9th harmonics) of the resistive current from the total current using high-precision sampling filter circuits, digital filtering technology, and Fourier harmonic analysis algorithms. By extracting the true fundamental resistive current, the instrument can sensitively assess the health of the arrester and effectively filter out on-site corona and electromagnetic interference.
Main Functions and Features
Modern zinc oxide arrester testers are highly intelligent and possess the following core features:
Multi-dimensional parameter measurement: Capable of comprehensively measuring total current, resistive current (fundamental peak and various harmonics), capacitive current, power frequency reference voltage, active power, and phase difference, and supports displaying real waveforms of voltage and current.
Multiple synchronization and sampling methods: Supports wired synchronization (PT secondary side sampling), wireless synchronization (transmission distance up to 1500 meters or more), electric field induction plate sampling, and voltage-free software angle setting, adapting to various complex on-site conditions.
Three-phase simultaneous measurement and anti-interference: Supports simultaneous three-phase current/voltage testing, greatly improving work efficiency. Built-in anti-interference calculation functions and angle compensation functions (such as automatic edge compensation) can completely solve the three-phase mutual interference problem at voltage levels of 220kV and above.
Portable and intelligent data management: Mostly adopts a handheld design (weight about 1kg-7.5kg), built-in large-capacity lithium battery, suitable for field environments without power supply. Equipped with a color touch screen, supports U-disk export of Word files, Bluetooth APP control, and mass data storage during power failure.
Reference for Core Technical Indicators
Equipment parameters vary slightly among different manufacturers; the following are typical ranges of technical indicators:
Measurement range: Total current, resistive current, and capacitive current are typically 0 to 20mA; reference voltage is typically 30V to 250V.
Measurement accuracy: The measurement error for total current and reference voltage is usually between ±2% and ±5%; the measurement error for the fundamental resistive current is generally around ±5%.
Power supply: Built-in high-energy lithium-ion battery (continuous working time usually greater than 7-8 hours), or supports external adapter.
Environmental adaptability: Operating temperature is usually -10℃ to 50℃, relative humidity ≤90% (non-condensing), with excellent field adaptability.
Main Application Fields
Power system operation and maintenance: Preventive tests, handover tests, and routine live-line inspections of arresters in substations of various voltage levels.
Line arrester survey: Condition assessment of gapless zinc oxide arresters on transmission lines.
Manufacturing and quality inspection: Factory tests, laboratory acceptance tests, and calibration of action counters and pollution meters for arrester manufacturers.
Representative Brands and Manufacturers
The technology of zinc oxide arrester testers on the market is mature, and representative manufacturers include:
Wuhan Moen Intelligent Electric (Fankester MOEORW): Its MEYB-BS series emphasizes handheld portability and high reliability, supports wireless transmission over 1500 meters, and has comprehensive anti-interference and three-phase simultaneous measurement functions.
Wuhan Binghua Wang Electric (BHW series): Designed specifically for on-site live detection, the main unit weighs only 1.0kg and can be held in one hand. Its voltage collector integrates an OLED screen, combining phase sequence detection and harmonic analysis functions, eliminating the need for additional instruments.
Wuhan UHV (UHV series): Products utilize advanced digital waveform analysis technology, support multiple synchronization methods, and maintain high-precision measurement in live-line, outage, and laboratory scenarios.
Huayi Electric (HYBLC-V series): Adopts a high-performance ARM processor with a DSP floating-point processing unit, offering extremely high computational accuracy, supporting both AC/DC power and Bluetooth data upload.
Selection Recommendations
Clarify test scenarios: If mainly used for routine live-line inspections in substations, it is recommended to choose handheld, lightweight (1-2kg) models that support wireless/voltage-free sampling to improve on-site work efficiency.
Focus on anti-interference capability: For high-voltage substations of 220kV and above, it is necessary to choose equipment with automatic phase-to-phase interference compensation (edge compensation) and digital filtering technology to ensure the accurate extraction of resistive current.
Data and compliance: Verify whether the equipment complies with the latest industry standards such as DL/T 474.5-2018 or DL/T 987-2005. Also, consider whether it supports U-disk export, Bluetooth APP control, and other functions for later report generation and integration into production management systems.
