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Zinc Oxide Surge Arrester Tester -
Diagnostic Leakage Current Analyzer for Live & Offline Substation Maintenance

The RAT-3000 Series Zinc Oxide Surge Arrester Tester evaluates the insulation integrity and zinc oxide valve degradation of high-voltage surge arresters (10 kV to 750 kV). Utilizing 3rd-harmonic Fourier analysis with phase compensation, the analyzer separates total leakage current into resistive and capacitive components without interrupting grid operation. Built for high-EMI substation environments, it provides real-time diagnostics for utility preventive maintenance and factory quality control.

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Standards & Calibration

IEC 60099-4:

Metal-oxide surge arresters without gaps for A.C. systems — Diagnostic leakage current test compliance.

IEEE C37.40 / C37.41:

Standard requirements and test procedures for high-voltage current-limiting devices.

DL/T 474.5:

Guide for insulation test on site — Metal oxide surge arrester test standards.

Traceable Calibration:

Every unit ships with a factory calibration certificate traceable to CNAS or ISO/IEC 17025 accredited laboratories. Phase calibration accuracy is verified under simulated 50 Hz/60 Hz high-field induction conditions.

Product Series

Model	Application Scope	Voltage Sampling Method	Core Feature
Field Portable	On-site live/offline testing (10 kV to 220 kV)	Wireless PT Secondary (up to 400m)	Dual-channel wireless voltage sync, Li-ion battery operated
Substation Master	EHV/UHV Substations (up to 750 kV)	Wireless / Wired / Voltage-Free	Advanced phase compensation for strong inter-phase interference
Benchtop QC	Factory manufacturing QA & Lab testing	Direct HV Transformer Input	Automated multi-spec batch evaluation, RS485/USB PLC integration

Technical Specifications

Parameter	Specification	Test Method / Standard
Full Leakage Current Range	0.000 mA to 20.00 mA (plus/minus 0.5 percent reading plus 2 digits)	True RMS Current Sensing
Resistive Current Range	0.000 mA to 20.00 mA (plus/minus 1.0 percent reading plus 2 digits)	Fundamental & Harmonic Waveform Decomposition
Capacitive Current Range	0.000 mA to 20.00 mA (plus/minus 0.5 percent reading)	Calculated via Phase Angle Differential
Harmonic Current Measurement	3rd, 5th, 7th Order Harmonic Components	FFT (Fast Fourier Transform) Analysis
Reference Voltage Input Range	AC 10 V to 250 V (PT secondary output)	Isolated Voltage Divider Circuit
Voltage Measurement Accuracy	Plus/minus 0.5 percent reading	True RMS
Phase Angle Range & Accuracy	0 degrees to 360 degrees, Accuracy: plus/minus 0.1 degree	Precision Zero-Crossing Synchronizer
Wireless Sync Range	Greater than 400 meters (line-of-sight)	433 MHz Encrypted Industrial RF Spectrum
Interference Compensation	Automatic plus/minus 90 degrees inter-phase angle correction	Software Fourier Algorithm
Display & Output	7-inch Sunlight-readable TFT Touch Screen	Real-time Waveform Display & Numeric Table
Data Storage / Interface	10,000 internal records, USB flash drive export	CSV format / PC Diagnostic Suite
Operating Power	Built-in 14.8V 5200mAh Lithium battery	Continuous field operation greater than 10 hours
Ingress Protection & Enclosure	IP65 (lid closed), Ruggedized ABS case	IEC 60529 standard enclosure
Weight & Dimensions	5.8 kg (main unit); 410 mm x 320 mm x 180 mm	Compact portable field chassis

Applications

In-Service Substation Diagnostics:

Live testing of metal-oxide surge arresters (MOSA) on 10 kV to 750 kV transmission lines without shutting down line voltage.

Moisture Ingress & Aging Identification:

Detection of internal dampness, surface contamination, and varistor valve degradation via 3rd-harmonic resistive current tracking.

Preventive Maintenance Shutdowns:

Offline measurement of total leakage current, fundamental resistive current, and power dissipation during scheduled maintenance outages.

Arrester Manufacturing Acceptance:

Quality assurance verification on the assembly line for voltage distribution and leakage stability prior to factory dispatch.

Quality Control & Manufacturing Support

01/

Our facility operates under an ISO 9001: 2015 certified quality management system dedicated to high-voltage test instrument manufacturing:

02/

Electromagnetic Compatibility (EMC): Circuit boards pass strict surge immunity and high-frequency noise suppression tests (IEC 61000-4-2/4/5) to prevent lockups inside EHV switchyards.

03/

Thermal Stress Burn-in: 100 percent of finished circuit assemblies undergo 72-hour environmental temperature cycling (-20 degrees Celsius to +60 degrees Celsius) before final calibration.

04/

OEM / ODM Customization:
Custom firmware language localized for European and North American regional compliance.
Custom branding, silkscreen panels, and transport case configurations.
Specialized voltage ratio settings for non-standard PT outputs.

Our Certificate

FAQ

Q: How does this analyzer isolate resistive leakage current from total current in live conditions?

A: The unit samples reference voltage from the PT secondary terminal (wired or via wireless radio link). Internal DSP firmware applies Fourier analysis (FFT) to determine the exact phase angle (phi) between the voltage and current vectors. This decomposes total leakage current (It) into resistive current (Ir = It times cosine of phi) and capacitive current (Ic = It times sine of phi), isolating varistor aging without disconnecting the arrester.

Q: How does the instrument correct phase angle errors caused by adjacent line interference?

A: In three-phase substation layouts, magnetic fields from neighboring phases cause phase shifts (inter-phase interference). The analyzer includes an integrated phase compensation module allowing operators to enter standard correction angles (e.g., plus/minus 30 degrees or custom angles) or select automated three-phase correction settings to calculate true single-phase resistive leakage.

Q: Can the tester operate without a PT voltage reference signal?

A: Yes. When PT secondary connections are inaccessible, the device operates in voltage-free harmonic mode. It calculates 3rd, 5th, and 7th harmonic current components to evaluate varistor degradation trends, providing an effective diagnostic indicator for routine screening.

Q: What is the maximum line-of-sight distance for wireless voltage sampling?

A: The high-power 433 MHz wireless RF transmission module maintains real-time voltage synchronization up to 400 meters in standard substation field layouts, eliminating the need to drag long reference cables across high-voltage yards.

Q: How are test results exported and analyzed?

A: Test results are stored onboard or exported via USB host in standard CSV format. The bundled PC diagnostic software allows asset managers to plot historical leakage current trend curves, evaluate deterioration speed, and generate formal PDF maintenance reports for utility asset audit records.

Q: What calibration documentation is provided with international shipments?

A: Each unit includes an OEM Factory Inspection Report along with an ISO/IEC 17025 accredited calibration certificate stating measured errors across current (0 to 20 mA), voltage (10 to 250 V), and phase angle (0 degrees to 360 degrees). Recalibration cycles are recommended every 12 months.

One-stop Cosmetic Tube Factory in China

Need a reliable diagnostic set for substation fleet maintenance or OEM distribution?
Contact our technical application team for detailed engineering documentation, tender support specs, or factory-direct pricing.

Email: wang@transformer-test.com
Lead Time: 5 to 10 business days for standard units; 15 to 20 business days for custom OEM branding.
Package Includes: Main Analyzer Unit, Wireless PT Voltage Sampling Transmitter, High-Precision Current Clamp / Sampling Cable, Grounding Cable, Power Adapter, Factory Calibration Certificate, Waterproof Pelican-style Transport Case.

Refine On (Hebei) Electric Power Technology Co., Ltd. is one of the most reliable lightning arrester tester manufacturers and suppliers in China, also supports customized service. Please feel free to wholesale advanced lightning arrester tester at competitive price from our factory. Contact us for quotation.

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