PD-free AC Withstand Voltage Test System

This PD-free AC Withstand Voltage Test System meets strict insulation inspection and partial discharge testing standards for all types of modern high-voltage apparatus. Equipped with premium SF6 gas insulated transformers, it eliminates pollution risks of traditional oil-filled test transformers while maintaining stable insulation and long service life. Many electrical manufacturers send purchase enquiries to source this complete test rig for mass production quality control.

Built around SF6 insulated core components, the PD-free AC Withstand Voltage Test System outputs stable 250kV voltage and restricts partial discharge within 5pC. It features automatic intelligent control, multi-stage reactive power compensation, low-noise operation and full safety interlocks, attracting continuous bulk orders from power utilities, industrial factories, universities and professional high-voltage labs.

Integrated Complete Test Platform

It supports testing on transformers, GIS switchgear, power cables, bushings, insulators and reactors. The whole unit combines high voltage transformer, coupling capacitor, voltage divider, current limiting reactor and intelligent control console into an all-in-one station, helping procurement teams save separate equipment purchasing costs.

When operating under rated voltage, this PD-free AC Withstand Voltage Test System keeps partial discharge ≤5pC, fully meeting factory acceptance tests, type certification, routine insulation checks and laboratory research requiring ultra-low PD levels. Its waveform distortion is controlled below 2%, generating stable, reproducible test data compliant with international industry standards.

Efficient Reactive Power Compensation

The built-in low-voltage compensation reactor cuts overall power consumption and boosts operating efficiency. Multi-level reactive power fine adjustment ensures steady voltage output under heavy complex test loads, a key highlight that drives long-term cooperative buyers to submit repeat bulk orders.

Reliable Intelligent Control & Multi-Layer Safety Protection

The control console realizes smooth voltage regulation and real-time data monitoring, allowing technicians to complete withstand voltage tests efficiently with full safety. Multi-protection designs including overvoltage cutoff, current limiting and discharge prevention greatly lower hazards during high-voltage experiments.

With optional 500kV high-output specification and superior partial discharge suppression performance, the PD-free AC Withstand Voltage Test System remains a top choice for power plants, electrical manufacturers and labs conducting insulation evaluation and high-voltage equipment verification.

Working Principle

The PD-free AC Withstand Voltage Test System relies on an SF6 insulated transformer to deliver steady 50Hz high-voltage AC power for inspection. A built-in coupling capacitor captures partial discharge signals in real time, while the voltage divider tracks output voltage throughout the whole test cycle. Matching compensation reactors automatically adjust reactive power demand, lowering power input and boosting overall operational efficiency.

Fitted with current-limiting reactors and full safety interlock modules, this unit shields both test samples and the host device from sudden overvoltage and flashover risks, delivering stable, secure testing results that win recognition from purchasing engineers.

Target Application Scenarios

Grid Power Operators

Ideal for substation equipment maintenance, project commissioning and insulation diagnosis on transformers, GIS cabinets and high-voltage switchgear. Many power station purchasers submit bulk procurement requests for this system to standardize regular inspection work.

Transformer Production Factories

Perfect for daily production spot checks, factory acceptance testing and official type certification of power & distribution transformers. Manufacturing procurement teams often reserve stock of this tester to shorten production inspection cycles.

Professional High-Voltage Labs

Its ultra-low partial discharge performance meets strict standards for product certification and new product R&D testing, attracting lab buyers to place long-term supply orders.

Universities & Research Institutions

Suitable for dielectric material research, insulation performance analysis and high-voltage major teaching experiments. Research project buyers frequently request customized configurations before formal ordering.

Factory & Mining Industrial Users

Applied to periodic preventive checks and insulation status evaluation of core power facilities onsite, helping enterprise procurement departments cut third-party testing outsourcing costs.

Application Range

1.Power transformer insulation testing    

2.GIS partial discharge inspection

3.AC voltage withstand testing

4.High voltage switchgear routine detection

5.Bushing performance test

6.Power cable withstand test

7.Solid insulator quality inspection

8.On-site factory acceptance test (FAT)

9.Product type test & certification support

10.High voltage laboratory research work

Weshine Core Strengths

Weshine Electric specializes in developing and manufacturing high voltage testing instruments and partial discharge measuring equipment. Our PD-free AC withstand voltage test systems adopt mature SF6 insulation technology, ultra-low partial discharge indicators, precise voltage sampling and comprehensive safety protection. Tailored for power grid operators, electrical manufacturers, third-party labs and research institutions, our equipment delivers accurate, safe and efficient testing for modern high-voltage power devices. Global project purchasers can arrange sample testing before signing formal framework procurement agreements.

FAQ

Q1: What are the key technical specifications?

Rated capacity: 250kVA. Rated output voltage: up to 500kV. Partial discharge level: ≤5pC. Waveform distortion: ≤2%. System noise: ≤50dB. Continuous operation: 30 minutes. Overvoltage capability: 110% for 1 minute.

Q2: Why SF6 insulation instead of oil-filled type?

SF6 gas eliminates oil carbonization byproducts that create false PD signals, ensures stable dielectric performance, zero pollution risk, and maintains ≤5pC background PD level for accurate FAT on transformers and GIS.

Q3: What applications does this system support?

Transformer insulation testing, GIS switchgear PD inspection, power cable withstand tests, bushing/insulator performance evaluation, FAT, type certification, and high-voltage laboratory research.

Q4: How does the reactive power compensation work?

The built-in low-voltage compensation reactor (200kvar, multi-tap motorized switching) fine-tunes reactive power in steps. This maintains steady voltage under heavy test loads and improves overall operating efficiency.

Q5: What safety protection features are included?

Multi-layer protections including overvoltage cutoff, current limiting, discharge prevention, and full safety interlock modules with current-limiting reactor to shield against sudden flashover risks.

Q6: Who is this system designed for?

Power grid operators, transformer manufacturing factories, professional high-voltage labs, universities/research institutions, and industrial factory/mining users for routine and type testing.

Purchase Guide

Share your high voltage test parameters with our sales team to obtain customized quotations and complete technical files for your procurement plan.

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