Product Overview
The XHDD405 Wireless Zinc Oxide Surge Arrester Live Tester is a portable instrument used to detect internal defects such as poor contact between valve blocks of gapless zinc oxide arresters (MOA) in power systems of 10kV and below. In accordance with the Preventive Test Code for Power Equipment DL/T596, the operating condition of metal-oxide arresters shall be checked before each thunderstorm season and when necessary. Unlike conventional DC testers that require the arrester to be disconnected, the XHDD405 measures the resistive current and its harmonics while the arrester remains energized, enabling fast, safe and efficient live-line assessment without interrupting power supply.
Target Users
This instrument is designed for electrical maintenance teams of rubber and plastic manufacturing plants, who need regular live checks of arresters protecting sensitive production lines; university and vocational college electrical engineering teaching laboratories, which require portable, easy-to-operate instruments for practical training on arrester condition assessment; hotel and resort facility engineering departments, which maintain distribution systems around the clock without service interruption; and port and shipping terminal electrical maintenance crews, who need reliable live-line testing in harsh outdoor environments.
Performance Features
Wireless live-line measurement: the arrester stays connected during testing, and the operator works at a safe distance;
Six test modes: full current, resistive current fundamental wave, 3rd harmonic resistive current, 5th harmonic resistive current, capacitive current and arrester power consumption;
Harmonic analysis of the 3rd, 5th and 7th orders for in-depth diagnosis of arrester aging and moisture ingress;
Adopts full digital processing with a built-in mathematical model, providing high and stable measurement accuracy;
Automatically senses ambient temperature and records it in the test results;
Can store 120 groups of test data without loss after power failure, supporting real-time viewing and printing;
Wireless remote control testing at up to 100 meters for convenient and efficient field operation;
Portable design with built-in rechargeable battery supporting continuous work of more than 8 hours.
Technical Specifications
| Item |
Specification |
| Current measurement range |
0 ~ 10mA RMS, accuracy ±(5% + 5μA) |
| Voltage input range |
25V ~ 250V RMS, accuracy ±(5% + 0.5V) |
| Harmonic analysis |
3rd / 5th / 7th harmonic, accuracy ±(10% + 10μA) |
| Wireless transmission |
433MHz, remote distance up to 100m |
| Data storage |
120 groups, retained after power failure |
| Charging time / battery life |
2 - 3 hours / ≥8 hours continuous work |
| Ambient temperature / humidity |
-10°C ~ 50°C / ≤85% RH at 25°C |
Wireless Live-Line Testing Principle and Data Management
During a live-line test, a current clamp is connected to the ground lead of the surge arrester to acquire the full leakage current signal, while the voltage signal is obtained from the secondary side of the voltage transformer or through the test voltage lead. The tester analyzes the fundamental wave and harmonic components of the resistive current to evaluate the operating condition of the arrester. The measured data, together with the automatically sensed ambient temperature, is transmitted to the handheld unit through the 433MHz wireless link, allowing the operator to stay away from high-voltage areas during the whole process. Up to 120 groups of test records can be stored in the instrument, and they remain intact after power-off; stored records can be reviewed in real time and printed on site, which is convenient for establishing maintenance files and comparing historical data before and after each thunderstorm season.
FAQ
Q1: What parameters does the XHDD405 measure?
It measures the full current, resistive current fundamental wave, 3rd and 5th harmonic resistive current, capacitive current and arrester power consumption of the metal-oxide surge arrester, and performs 3rd to 7th harmonic analysis for condition diagnosis.
Q2: Can the arrester remain energized during the test?
Yes. The XHDD405 is a live-line tester: the arrester does not need to be disconnected from the system. The current signal is obtained through a clamp on the ground lead, which avoids power outage and greatly improves testing efficiency.
Q3: Which power systems is it suitable for?
It is designed for gapless zinc oxide arresters (MOA) in power systems of 10kV and below, with a voltage input range of 25V to 250V, and can be widely used in distribution networks, industrial plants, substations and renewable energy stations.
Q4: How does the wireless function help field testing?
The 433MHz wireless link transmits data over up to 100 meters, so the operator can control the test and read results from a safe distance away from the high-voltage area, which is both safer and more convenient for single-person operation.
Q5: How are test records managed?
The instrument stores up to 120 groups of test data, which is retained without loss after power failure. Records can be viewed in real time and printed on site, making it easy to build maintenance archives and compare results across thunderstorm seasons.
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