Live-Line Instrument for Zinc Oxide Surge Arresters

Product Introduction

The MEYB-W302 Live-Line Testing Instrument for Zinc Oxide Surge Arresters is suitable for live or de-energized testing of zinc oxide surge arresters across various voltage levels, enabling timely detection of hazardous defects such as internal insulation moisture ingress and valve plate aging.

The instrument features simple operation and user-friendly design, with the entire measurement process controlled via a human-machine interface. It measures total current, resistive current and its harmonics, power frequency reference voltage and its harmonics, active power, and phase difference for zinc oxide surge arresters. A large screen displays true waveforms of voltage and current. Employing digital waveform analysis technology, the instrument utilizes software-based anti-interference methods such as harmonic analysis and digital filtering to ensure accurate and stable measurement results. It precisely analyzes fundamental wave content and harmonic content from the 3rd to 9th harmonics, while overcoming phase-to-phase interference to accurately measure the resistive current of edge-phase surge arresters.

Product Parameter (specification)

1. Power Supply	Internal lithium battery or DC 8.4V adapter
2. Measurement Range	Leakage Current;0-20mA (expandable); (Optional;Current clamp sensor 0-20mA.) Voltage;30-250V (expandable); (Optional;Electric field strength input range;30kV/m~300kV/m.) Angle;0-360º Resistive current;0-20mA (expandable); Capacitive current;0-20mA (expandable);
3. Measurement Accuracy	Current;When total current >100μA;±5% of reading ±1 digit; Voltage;When reference voltage signal >30V;±5% of reading ±1 digit.
4. Measurement Parameters
Leakage Current	Leakage Current;Full current waveform, fundamental rms value, peak value. Resistive Component of Leakage Current;Waveform, fundamental and harmonic rms values (1st, 3rd, 5th, 7th, 9th). Primary Peak Ir1p, Peak Irp. Capacitive Current Fundamental. Voltage;Voltage waveform, voltage rms value. Phase Angle Difference, Power Dissipation.
5. Lithium Battery Parameters	Charge time > 2.5 hours Continuous operating time > 7 hours Intermittent operating time > 7×24 hours
6. Unit Dimensions	Main unit;42cm × 34cm × 18cm
7. Unit Weight	Main unit;7.5kg

Product feature and application

1. Color Touchscreen: 7-inch high-definition color touchscreen with 800×480 resolution for interactive operation.

2. Multiple Synchronization Methods: Supports wired synchronization (with voltage); voltage-free synchronization via software angle setting or current analysis method to determine voltage reference.

3. Live/Dead Line Compatibility: Suitable for use on energized surge arresters, de-energized lines, or laboratory environments.

4. Wide measurement range: Voltage range 0-250V, current range 0-20mA.

5. Simultaneous three-phase testing: Truly achieves simultaneous measurement of three-phase current and voltage, enhancing efficiency; also supports single-phase or two-phase testing for flexible selection.

6. Safe and reliable: Internal circuitry operates at low voltage (≤8.4V); current and voltage sensors are fully isolated for safety.

7. Selectable Voltage Methods: Supports using three-phase or phase B voltage as reference; supports phase B electric field strength via induction plate as voltage reference (optional), facilitating voltage sampling; supports voltage measurement in maintenance power terminal boxes (busbar-related).

8. Selectable Current Methods: Can sample leakage current by connecting wires to both ends of the surge arrester counter.

Alternatively, current clamps can be used to collect leakage current from the arrester's grounding wire (optional).

9. Standard anti-interference processing: Features anti-interference calculation and angle compensation functions, completely resolving mutual interference between phases. Meets requirements for 220kV and higher voltage levels.

10. Built-in lithium battery: Standard high-energy lithium-ion battery included, ideal for power-free environments.

11. High-speed sampling: High sampling frequency combined with advanced digital signal processing delivers strong anti-interference performance and extremely high measurement accuracy.

12. Built-in calendar clock: Provides time reference for printing and saving data.

13. Massive test data storage: Features large-capacity storage for extensive data retention. Includes data storage, browsing, and power-off protection functions.

14. USB Data Export: Equipped with USB data export functionality, exporting data as Word files.

15. Bluetooth Control and Data Upload: Standard Bluetooth capability with Android Bluetooth app. Control, upload, and generate Word files via smartphone or tablet after installing the app.

16. Customizable Background Colors: Adjust screen colors to patterned blue or black backgrounds. Configure background brightness, standby brightness, and standby duration.

17. Built-in Training Materials: On-screen guides display various wiring configurations for field operation reference.

18. English Input for Test Data: Enter site, equipment, personnel, and remarks in English for clear labeling and printing of test records.

19. Language Switching: Directly toggle between Chinese and English interfaces to accommodate both domestic and international usage scenarios (optional).

20. Portable Design: Desktop-style main unit with an integrated dustproof and corrosion-resistant enclosure. Compact size and lightweight construction ensure easy portability.

21. Optional State Grid Communication Protocol Support: Optionally supports RS232, RS485, or Bluetooth protocols. Protocol specifications vary by province; specify requirements during customization.

22. Optional Features: Standard versions do not include optional functions; customers may customize based on specific needs.

Prodection details

MEYB-W302 Zinc Oxide Surge Arrester Live Testing Instrument is a specialized device for testing the electrical performance of zinc oxide surge arresters.

Company Qualifications

FAQ

1) How can the condition of a zinc oxide arrester be determined based on test data?

Resistive current testing lacks corresponding regulations (only a few provinces have enterprise standards), so this test cannot directly provide criteria for determining quality. Test data, like that from a multimeter or test waveform generator, can only provide precise measurements-it cannot indicate whether the arrester is good or bad.
Leakage current varies with the voltage rating of the zinc oxide arrester. Higher voltage ratings correspond to greater leakage currents. For fundamental full currents: - 10kV-35kV: Typically below 0.2mA - 110kV: Typically around 0.3mA - 220kV: Typically around 0.4mA - 500kV: Typically around 0.8mA Most customers develop their own criteria after extensive testing.
Measurement data typically includes fundamental full-current, peak full-current, fundamental resistive current, peak resistive current, and phase angle difference.
Three comparison methods exist: comparing test data with factory test reports (manufacturer data comparison), comparing test data with historical test data (longitudinal data comparison), and comparing test data with other zinc oxide surge arresters of the same model (cross-sectional data comparison).

(2) How to test valve-type surge arresters?

This equipment cannot test valve-type surge arresters. They contain a ball-type gap mechanism where voltage cannot exceed the gap voltage, effectively causing disconnection with zero leakage current.

(3) Why do phase angle differences vary among three-phase zinc oxide surge arresters?

This occurs when three-phase high-voltage lines are closely spaced, causing induced voltage from the other two phases to affect the phase in question. This results in a smaller phase angle for Phase A and a larger phase angle for Phase C. For 110kV and below, the impact is generally negligible. At 220kV, the probability is approximately 20%, and at 500kV and above, it rises to 50%. Most deviations are less than 2 degrees, though in rare cases, significant impacts exceeding 5 degrees can occur, causing Phase C's phase angle difference to exceed 90 degrees.
First, this is a normal physical phenomenon, not an issue with the testing principle or instrument. Second, instruments typically employ anti-interference calculation methods. Using both software and hardware techniques, they infer the actual angles of phases A and C based on the condition of phase B.

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