VS-CLXZ270-108 Variable Frequency Series Resonance Test System

Products Details

The VS-CLXZ270-108 Variable Frequency Series Resonance Test System is specifically developed for field and laboratory AC withstand voltage testing of medium- and high-voltage electrical equipment. By utilizing the principle of series resonance, the system produces high-voltage output while significantly reducing the required input power, improving testing efficiency and reducing operating costs.

The complete system consists of a variable frequency power supply, dual excitation transformers, eight dry-type high-voltage reactors, a capacitive voltage divider, a compensation capacitor, and dedicated connection cables. Through flexible series and parallel combinations of the reactors, the system can accommodate a wide range of test objects including long-distance XLPE power cables, power transformers, switchgear, and instrument transformers.

The intelligent frequency converter automatically locates the resonance point and maintains stable resonance throughout the testing process. Operators can choose between automatic, semi-automatic, and manual operating modes according to field requirements. Real-time monitoring of voltage, current, frequency, resonance status, and test duration ensures accurate and repeatable test results.

The system provides excellent electrical performance with waveform distortion below 1%, resonance quality factor Q ≥ 30, and output frequency adjustable from 30Hz to 300Hz. Built-in automatic voltage stabilization maintains test voltage stability within 1.0%, ensuring reliable testing performance even under changing load conditions.

Designed for demanding field applications, the equipment features multiple protection functions including overvoltage, overcurrent, flashover, detuning, undervoltage, zero-position interlock, and emergency stop protection. The rugged aluminum enclosure and shock-resistant structure ensure reliable operation during transportation and on-site testing.

Product Guide

How the System Works

The system generates an adjustable frequency output through the variable frequency power supply and dual excitation transformers. By changing the operating frequency, the inductive reactance of the reactors matches the capacitive reactance of the test object, creating a series resonance condition.

At resonance, high voltage is generated across the test object while only a small amount of power is drawn from the power source. This significantly improves testing efficiency and minimizes power requirements. The intelligent controller continuously tracks the resonance point and automatically adjusts the operating frequency to maintain stable resonance conditions throughout the test.

Features

1、Variable frequency series resonance technology

2、Rated capacity up to 270kVA

3、Maximum output voltage up to 108kV

4、Output frequency range from 30Hz to 300Hz

5、Output waveform distortion ≤1%

6、Automatic resonance point searching

7、Automatic frequency tracking and stabilization

8、Automatic, semi-automatic, and manual operation modes

9、Eight dry-type high-voltage reactors

10、Dual excitation transformer design

11、Automatic voltage stabilization function

12、Voltage stability up to 1.0%

13、Large touchscreen display interface

14、Real-time voltage and frequency curve display

15、Data storage for up to 50 test records

16、USB data export and printing support

17、Comprehensive protection system

18、Portable and field-friendly structure

Application Scenarios

Power Cable Testing

Suitable for AC withstand voltage testing of 35kV XLPE cables up to 2km and 10kV cables up to 5km.

Power Transformer Testing

Used for insulation verification and dielectric testing of 10kV and 35kV power transformers.

Switchgear Testing

Provides AC withstand voltage testing for high-voltage switchgear and circuit breakers.

CT and PT Testing

Ideal for current transformer and voltage transformer insulation testing.

Substation Commissioning

Widely used for acceptance testing of newly installed electrical equipment before energization.

Preventive Maintenance Programs

Supports periodic insulation assessment to improve equipment reliability and reduce unexpected failures.

Applications

1、XLPE Power Cable AC Withstand Voltage Testing

2、Power Transformer Testing

3、Distribution Transformer Testing

4、High Voltage Switchgear Testing

5、Current Transformer Testing

6、Voltage Transformer Testing

7、Substation Commissioning Tests

8、Preventive Maintenance Testing

9、Factory Acceptance Testing (FAT)

10、Electrical Equipment Insulation Evaluation

Weshine Advantages

Weshine Electric specializes in the development and manufacturing of high-voltage testing equipment and resonance testing systems. The VS-CLXZ Series Variable Frequency Series Resonance Test Systems combine advanced resonance technology, intelligent frequency control, automatic tuning, and comprehensive safety protection. Designed for utilities, electrical contractors, manufacturers, and testing laboratories, Weshine solutions provide accurate, efficient, and reliable AC withstand voltage testing for modern power systems.