Product Introduction
Wuhan UHV Power Technology Co.,Ltd., is a professional manufacturer and supplier of high-voltage power testing equipment in China.This instrument is designed for the measurement and analysis of leakage current in zinc oxide surge arresters (MOA). It is primarily used to measure resistive current in order to assess the degree of aging and moisture ingress of the zinc oxide elements. The on-site live testing complies with the requirements of the People's Republic of China power industry standard DL474.5-92 – Field Insulation Test Implementation Guide – Arrester Test. Additionally, the instrument can also be used in laboratory settings for factory and acceptance testing.
Product functions
Total leakage current measurement
Measures the total leakage current of the zinc oxide arrester to understand the overall operating condition.
Resistive current measurement
The most core function, used to determine abnormal conditions such as aging and moisture ingress of the zinc oxide valve plates in the arrester.
Capacitive current measurement
Analyzes the capacitive component of the leakage current, providing supplementary basis for arrester condition assessment.
Phase angle measurement and analysis
Analyzes the resistive and capacitive characteristics of the leakage current, assisting in judging the operating condition of the arrester.
Harmonic analysis
Extracts current signal characteristics through Fourier analysis, improving diagnostic capability for arrester condition.
On-site live testing
Can perform on-site testing while the arrester is in normal operation, mainly used for condition assessment of in-service arresters.
Các thông số kỹ thuật
| Phạm vi đầu vào điện áp tham chiếu (cực đại) | 10V ~ 200V, có thể tùy chỉnh (0-250V) |
| Full leakage current Measuring range (peak) | 100uA ~ 8mA, có thể tùy chỉnh (0-20mA) |
| Resistive current Measuring range (peak) | 100uA ~ 8mA, có thể tùy chỉnh (0-20mA) |
| Capacitive current Measuring range (peak) | 100uA ~ 8mA, có thể tùy chỉnh (0-20mA) |
| Phạm vi đo góc | 0°～90° |
| Quyền lực | 4W |
| Độ chính xác đo lường hệ thống | ± (đọc × 5% + 5 từ) (dòng điện hài không quá 2 mA) |
| nguồn điện xoay chiều | AC220V ±10%，50Hz ±1% |
Product Characteristics
1. User-Friendly Interface: Features a large-screen LCD display with full Chinese menu operation for ease of use.
2. High-Precision Data Processing: Utilizes high-precision sampling processing circuits and advanced Fourier harmonic analysis technology to ensure more reliable data.
3. Reliable Signal Acquisition: Employs a unique high-speed magnetically isolated digital sensor to directly collect input voltage and current signals, ensuring data reliability and safety.
4. Advanced Functions: Provides resistive current fundamental peak output and phase correction functions.
5. Data Storage & Printing: Equipped with a calendar clock and micro printer, and capable of storing measurement data.
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Application Scenarios
Substation routine operation and maintenance testing
Performs periodic leakage current testing on in-service zinc oxide arresters to assess equipment operating condition.
Preventive testing of zinc oxide arresters
Detects potential issues such as aging and moisture ingress in arresters by measuring parameters such as total leakage current and resistive current, used for fault prevention.
On-site live testing
Can be performed without de-energizing the arrester, suitable for on-site operation and maintenance scenarios such as substations and transmission lines.
Arrester condition assessment
Analyzes test data to determine whether the arrester currently has abnormalities, and observes trends in condition changes by combining with historical data.
Arrester factory testing
Used for performance testing of zinc oxide arresters during the manufacturing process.
Arrester acceptance testing
Performs acceptance testing on arresters after new installation or equipment retrofitting.
Power equipment maintenance and fault diagnosis
When abnormal operating parameters occur in the arrester, further locates issues through indicators such as resistive current, phase angle, and harmonics.
Power testing institutions / testing centers
Used for on-site testing, laboratory testing, and periodic condition assessment of arresters.
FAQ about Zinc Oxide Lightning Arrester Leakage Current Tester
Q: How does the Zinc Oxide Arrester Tester help identify aging or moisture problems in arresters?
A: The device further decomposes and analyzes the leakage current, with particular focus on the resistive current and related characteristic parameters. When the performance of the valve plates inside the arrester changes, the leakage current characteristics may also change accordingly. Therefore, regular testing combined with trend comparison against historical test data can be performed. In actual judgment, the test results should be evaluated together with the equipment's historical data, operating conditions, and other test results, rather than drawing conclusions based solely on a single parameter.
Q: Can one device cover zinc oxide arresters of different specifications? How should one determine this when making a purchase?
A: Whether it is applicable cannot be determined solely by the device name. Instead, confirmation should be based on the type of arrester under test, leakage current range, reference voltage requirements, and on-site wiring conditions. If the user's project involves multiple voltage levels or arresters of different specifications, it is recommended to verify the device range and test configuration against the actual project parameters before purchase, to avoid the situation where "the instrument can measure, but the range or on-site interface does not match."
Q: Why is it necessary to perform regular leakage current testing on zinc oxide arresters?
A: Zinc oxide arresters are subjected to continuous system operating voltage over the long term, and the performance of their internal valve plates may gradually change with operating time, temperature variations, and environmental conditions. Regular leakage current testing helps establish a continuous record of equipment operating condition, enabling trend changes to be identified before abnormalities develop into serious faults, thereby providing a basis for preventive maintenance and condition-based maintenance.
