Product Introduction

        NDYH-VII Zinc Oxide Arrester Live Tester is a specialized instrument used to detect the electrical performance of zinc oxide arresters. It is suitable for live or de-energized testing of zinc oxide arresters at various voltage levels, enabling timely detection of hazardous defects such as internal insulation moisture and valve aging.

       The instrument is simple to operate and easy to use. The entire measurement process is controlled by a single-chip microcomputer. It can measure the full current, resistive current and its harmonics, power frequency reference voltage and its harmonics, active power, and phase difference of zinc oxide arresters. A large screen displays the true waveforms of voltage and current.

       Using digital waveform analysis technology, the instrument employs 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 the fundamental wave and 3rd to 7th harmonics, overcome phase-to-phase interference, and correctly measure the resistive current of side-phase arresters. The unit is equipped with a high-speed panel printer and rechargeable batteries, making it very convenient for field use. The instrument uses a unique high-speed magnetic isolation digital sensor to directly collect input voltage and current signals, ensuring data reliability and security.

Product Features

☆、Can measure resistive current using either direct testing or indirect testing via third harmonic analysis. 

☆、Simultaneously collects and displays three-phase voltage and three-phase current, achieving true three-phase simultaneous measurement. 
☆、Reference voltage signal can be obtained via 3PT, 1PT, no PT, wireless, or induction methods. 
☆、Equipped with rechargeable batteries, a calendar clock, and a micro printer; can store 256 sets of measurement data.
☆、Allows enabling or disabling side-phase compensation for convenient analysis of resistive current.
☆、Allows enabling or disabling waveform printing to save paper.

Technical Parameters

☆、Full current measurement range: 0~10mA RMS      

       Accuracy: ±(reading × 5% + 5μA)

☆、Accuracy of resistive current fundamental measurement (wired, excluding phase-to-phase interference):  ±(reading × 5% + 5μA)

☆、Current harmonic measurement accuracy: ±(reading × 10% + 10μA)

       Current channel input resistance: ≤2Ω

☆、Reference voltage input range: 25V~250V RMS   

       Accuracy: ±(reading × 5% + 0.5V)

☆、Voltage harmonic measurement accuracy: ±(reading × 10%)   Reference voltage channel input resistance: ≥1800kΩ

☆、Battery continuous operation time: Over 8 hours         

       Battery charging time: Over 2 hours

☆、AC charging: AC 220V ±10%，50Hz ±1%    

☆、Instrument weight: 5kg (excluding cable box)

☆、Instrument dimensions: 34cm×22cm×20cm