Partial Discharge Test Equipment

Looking for accurate and reliable Partial Discharge Test Equipment for your high-voltage insulation testing? Weshine provides high-performance PD testing systems, including PD-free AC hipot test systems, multi-channel PD analyzers, and custom high-voltage testing solutions. Fully compliant with IEC 60270 standards for laboratory, factory acceptance, and routine testing.

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Partial Discharge Test Equipment for High Voltage Insulation Testing

As a professional Electrical Testing Equipment Supplier, Weshine provides advanced Partial Discharge Test Equipment designed to detect localized insulation defects before catastrophic failures occur. Partial discharge (PD) is an electrical discharge that only partially bridges the insulation between conductors. Left undetected, ongoing PD activity leads to progressive insulation deterioration and eventual equipment breakdown.

Implementing a robust Partial Discharge Testing System is critical for utilities, testing laboratories, and electrical equipment manufacturers. Our PD measurement systems allow engineers to:

• Detect insulation defects early during manufacturing, commissioning, or routine maintenance.

• Prevent unexpected equipment failures and unscheduled outages.

• Evaluate insulation condition under real-world AC voltage stress.

• Reduce long-term maintenance costs by prioritizing proactive asset management.

Whether you need a full laboratory High Voltage Testing Equipment Factory China setup or precise PD diagnostic tools, Weshine delivers complete high-voltage insulation testing solutions engineered for safety, accuracy, and international compliance.

Testing Applications for High Voltage Electrical Equipment

Our Partial Discharge Testing Equipment is engineered for high-voltage dielectric evaluation across a wide variety of power assets:

Power Transformers

• Applications: Transformer factory acceptance testing (FAT), routine quality control, and insulation condition assessment.

• Key Focus: Detecting localized void discharges and surface tracking in oil-paper insulation systems.

• Keywords: Transformer Partial Discharge Test, Transformer Insulation Testing.

High Voltage Cables

• Applications: Cable production line quality inspection, installation acceptance testing, and joint/termination integrity verification.

• Key Focus: Locating treeing phenomena, insulation voids, and structural defects in XLPE and EPR cables.

• Keywords: Cable Partial Discharge Testing Equipment, Cable Fault Diagnostics.

Switchgear & GIS

• Applications: Gas-insulated switchgear (GIS) testing, metal-enclosed switchgear insulation evaluation, and high-voltage component testing.

• Key Focus: Identifying floating electrode discharges, internal arcing, and surface contamination.

• Keywords: GIS Partial Discharge Testing, Switchgear Diagnostics.

Other High Voltage Assets

• Applications: High-voltage reactors, bushings, post insulators, instrument transformers, and custom electrical components.

Our Partial Discharge Testing Equipment Solutions

Instead of offering disconnected instruments, Weshine structures its Partial Discharge Measurement System portfolio around practical testing workflows and high-voltage power integration:

1. Multi-Channel PD Analyzers & Measurement Hardware

High-accuracy digital partial discharge measurement instruments designed for multi-phase acquisition and complex signal evaluation.

• Featured Systems:

  • 4-Channel PD Analyzer — Ideal for routine laboratory and factory acceptance testing requiring simultaneous phase monitoring.

  • 8-Channel PD Analyzer — Engineered for comprehensive diagnostic analysis across complex multi-terminal electrical equipment.

2. Integrated Cable Diagnostic & Fault Location Systems

For field operators requiring both insulation health evaluation and pinpoint defect identification in power cable networks.

• Featured System:

  • Mobile Cable Fault Location System — Portable field vehicle/cart system integrating surge generators, reflectometers, and pre-location technology.

3. Specialized Online Monitoring Solutions

For critical assets requiring continuous field surveillance:

• Featured System:

  • Partial Discharge Online Monitoring System — Continuous insulation status monitoring for substation transformers and MV/HV switchgear.

Partial Discharge Measurement Technology

Weshine’s Partial Discharge Measurement Systems adhere to rigorous electrical measurement principles to deliver dependable diagnostic data:

IEC 60270 Conventional Electrical Measurement

The gold standard for laboratory and factory acceptance testing. This method directly measures the apparent charge (expressed in picocoulombs, pC) generated by partial discharge activity, using coupling capacitors and high-frequency measuring impedances connected to the test object.

Phase Resolved Partial Discharge (PRPD) Analysis

Our digital measurement systems plot discharge magnitude against the phase angle of the applied AC voltage. PRPD patterns allow engineers to clearly distinguish between different defect types, such as internal voids, surface discharges, and corona activity.

Advanced Noise Reduction & Filtering

Complex industrial environments are subject to electromagnetic interference (EMI). Our digital software algorithms utilize digital bandpass filtering, phase windowing, and dynamic thresholding to isolate true insulation discharges from ambient background noise.

Standards Compliance for Partial Discharge Testing

All Weshine Partial Discharge Test Equipment is designed according to recognized international testing standards to satisfy global compliance requirements:

Standard	Application & Scope
IEC 60270	High-voltage test techniques – Partial discharge measurements
IEC 60060	High-voltage test techniques – General definitions and test requirements
IEC 60076-3	Power transformers – Insulation levels, dielectric tests, and external clearances in air
IEC 62271 Series	High-voltage switchgear and controlgear testing procedures
IEEE 400.3	Guide for Partial Discharge Testing of Shielded Power Cable Systems

Advantages of Our Partial Discharge Test Equipment

When sourcing high-voltage test systems from Weshine, you gain technical reliability, custom engineering, and long-term diagnostic accuracy:

• Accurate & Stable PD Measurement: Ultra-low internal background noise design ensures true pC quantification without false positives.

• Integrated High-Voltage Capability: We deliver seamless integration between the AC Hipot power source, coupling units, dynamic filtering, and measuring software.

• Tailored System Configurations: Customizable voltage ratings, kVA capacities, and channel options matched to your factory or testing laboratory footprint.

• Complete Technical Support: Backed by engineering guidance for equipment selection, system calibration, wiring configuration, and operator training.

Partial Discharge Testing Equipment Selection Guide

Selecting the appropriate PD testing system depends on your testing environment, test object, and voltage stress requirements:

1. Based on the Testing Object

• Transformers & Bushings: Require high-voltage AC Hipot excitation combined with multi-channel conventional or acoustic PD detection.

• Power Cables: Require low-frequency or resonant AC voltage sources paired with high-frequency CT (HFCT) sensors or coupling capacitors.

• Switchgear & GIS: Benefit from integrated withstand voltage test sets equipped with coupling units for apparent charge analysis.

2. Based on Voltage Level & Power Rating

Ensure your AC power supply capacity (kVA) can drive the capacitive load of the test object at the required test voltage (kV). A PD-free testing transformer or resonant test system is essential to prevent source-generated discharge interference.

3. Based on Application Environment

• Factory Acceptance / Laboratory Testing: Requires stationary, highly precise systems with broad bandwidth and full IEC 60270 compliance.

• Production Line Testing: Focuses on fast connection, automated voltage ramp-up, pass/fail thresholding, and repeatable test logging.

Why Choose Weshine as Your Electrical Testing Equipment Supplier?

Weshine is a dedicated manufacturer and supplier of comprehensive high-voltage testing solutions. We understand that accurate partial discharge measurement relies on the performance of the entire high-voltage test loop.

• Complete Testing Equipment Portfolio: We supply everything required for a fully operational HV test bay, including PD-free AC hipot test systems, impulse generators, DC high-voltage test sets, and general Electrical Testing Instruments.

• Engineering & Application Support: Our technical team assists from initial bay design and isolation transformer selection to on-site commissioning.

• Global B2B Supply Capability: Trusted by electrical utilities, transformer OEMs, cable manufacturers, and independent high-voltage testing service providers worldwide.

Frequently Asked Questions

Q1: What is a partial discharge test?

A partial discharge test is a non-destructive high-voltage test used to detect localized electrical discharges in electrical insulation. It measures the small electrical pulses or acoustic emissions caused by insulation voids or defects under voltage stress, allowing engineers to identify potential failures early.

Q2: Why is partial discharge testing critical for power transformers?

Partial discharge in a power transformer indicates localized degradation in its oil or solid insulation. Left unchecked, PD activity can erode the insulation medium, leading to phase-to-ground or phase-to-phase short circuits, catastrophic transformer failure, and expensive downtime.

Q3: What equipment is needed for an IEC 60270 compliant PD test?

An IEC 60270 test setup typically includes a low-discharge High Voltage Power Source (such as a PD-free AC Hipot Transformer), a Coupling Capacitor, a Measuring Impedance, a Calibrator, and a Digital PD Analyzer.

Q4: What is the difference between offline and online partial discharge testing?

Offline PD testing is performed while the equipment is de-energized and connected to an external high-voltage power source (e.g., during factory acceptance or overhaul). Online PD testing occurs while the equipment is energized and operating under normal grid conditions.

Q5: How does a PD-free AC Hipot Test System differ from a standard Hipot tester?

A standard AC Hipot tester only measures overall leakage current and verifies breakdown voltage. A PD-free AC Hipot system uses specialized high-voltage shielding, filtering, and low-discharge transformer design to ensure that the test source itself generates zero interference (< 2–5 pC), allowing accurate measurement of microscopic insulation defects within the test object.