Dual Canopy Mechanic Electrical Engineering Co., Ltd. is one of the leading manufacturers and suppliers of surge arrester testing in China. Please feel free to wholesale discount products for sale here and get quotation from our factory. Customized orders are welcome.
What is surge arrester testing?
The surge arrester testing functions as a specialized live-line diagnostic tool for evaluating insulation condition and aging progression in Metal Oxide Varistor (MOV)-based surge arresters while they remain fully energized. Over extended service periods, these protective devices endure repeated overvoltage transients, environmental moisture ingress, surface contamination buildup, and cumulative thermal cycling. These stressors gradually degrade the internal nonlinear resistive elements, a process that manifests most tellingly through an upward drift in resistive current component.
Field crews deploy this instrument to capture several diagnostic quantities: total leakage current, the resistive current fraction, third harmonic content, and active power dissipation. Tracking these indicators over time allows maintenance teams to build a clear picture of arrester health and spot deterioration patterns before they progress to failure. The entire assessment proceeds without de-energizing the protected circuit or removing any connections, preserving system continuity while delivering actionable condition data.
What is Product features?
800×480 color LCD touch screen, high-speed thermal printer; graphic and text display, intuitive interface, facilitating operation and use by on-site personnel.
The wireless transmission of PT signals can cover up to 400 meters. With on-demand configuration, it can reach up to 2000 meters.
Suitable for use in places such as live lightning arrester locations, power-off situations, or laboratory environments.
Achieve simultaneous measurement of three-phase current and three-phase voltage, thereby enhancing work efficiency; it also supports single-phase or two-phase testing, providing convenient selection. The instrument is equipped with only weak electricity, with the voltage not exceeding 12V; the current and voltage sensors are completely isolated, ensuring safety and reliability.
Support two sampling methods for voltage reference signals: wired synchronization and wireless synchronization; also support a voltage-free mode, where the voltage reference is calculated through software. Support taking the voltage reference from three phases or from the B-phase voltage; also support using the induction plate method to take the B-phase electric field strength as the voltage reference (optional).
It is equipped with a high-capacity lithium-ion battery, making it particularly suitable for areas without power supply.
Equipped with an embedded industrial-grade operating system, it supports direct shutdown mode; it comes with a USB interface, supporting data export; it can be externally connected with a USB mouse and keyboard for convenient operation.
The internal configuration features a 4GB SD card that can store a vast amount of experimental data, and it also has functions such as data management and storage.
It is equipped with upper-level management software and features such as historical data management, data analysis, and report printing.
High sampling frequency, advanced digital signal processing technology, strong anti-interference performance, and extremely high measurement accuracy.
With anti-interference computing function and angle compensation function, it completely resolves the situation of mutual interference among the three.
The instrument software is powerful, with built-in help documentation, accompanying wiring pattern illustrations, and the ability to adjust the background image and color in strong light. It also supports taking screenshots of the interface and saving them as BMP images.
A dust-proof, water-proof and corrosion-resistant engineering plastic sealed box is adopted, which is small in size, light in weight and easy to carry.
The three-phase wireless zinc oxide arrester live testing instrument is a specialized device used for detecting the electrical performance of zinc oxide arresters. This instrument is applicable for both live and offline detection of zinc oxide arresters of various voltage levels, enabling timely identification of dangerous defects such as internal insulation moisture and valve plate aging in the equipment.
The instrument is simple to operate and convenient to use. The entire measurement process is controlled by a computer. It can measure the total current, resistive current and its harmonics, power frequency reference voltage and its harmonics, active power and phase difference of zinc oxide arresters. The large screen can display the true waveforms of voltage and current. The instrument employs digital waveform analysis technology and uses software anti-interference methods such as harmonic analysis and digital filtering to ensure accurate and stable measurement results. It can accurately analyze the content of fundamental wave and 3-7th harmonics and can overcome the influence of phase-to-phase interference, correctly measuring the resistive current of the side-phase arresters.
What are some common use cases?
Live-Line Inspection and Preventive Testing: Real-time measurement of electrical parameters without power interruption, generating periodic, comparative data.
Baseline Establishment for Newly Commissioned Arresters: Recording initial parameters to serve as a benchmark for subsequent trend analysis.
Troubleshooting Operational Anomalies: Conducting targeted inspections in cases of overheating, unusual odors, or abnormal ground currents.
Pre- and Post-Thunderstorm Season Retesting: Verifying after the thunderstorm season whether performance degradation has occurred due to lightning strikes.
Pre- and Post-Replacement Comparison: Quantifying the degree of aging to provide a basis for replacement decisions.
Remote Technical Support: Remote guidance for issues such as measurement anomalies, data fluctuations, software data export, and report templates.
Spare Parts & Accessories Supply: Long-term supply of current clamps, sensors, batteries, connection cables, and other components.
Repair & Calibration: Factory-based repair and calibration services to meet technical supervision and audit requirements.
Refresher Training: Designed to accommodate personnel turnover within work teams, ensuring consistency in measurement methods and data comparability.
FAQ
Q1: Can the Surge Arrester Tester perform live-line testing?
A: Yes, this instrument is specifically designed for live testing while the equipment is in operation; it does not require a power outage or the disconnection of cables.
Q2: What is the difference between measuring total current and measuring resistive current?
A: The total current contains a significant capacitive component and is susceptible to system harmonics; the resistive current, however, is more sensitive to the aging of the arrester and serves as a more critical indicator for assessing its condition.
Q3: Under what circumstances is it determined that a surge arrester requires replacement?
A: Typically, this determination is made based on a comprehensive assessment that considers the magnitude of the increase in resistive current (compared to historical baseline data), the upward trend in active power consumption, and the limits specified by the manufacturer or relevant regulations; making a decision based solely on a single test result is not recommended.
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