Variable Frequency Series Resonant Test System for High Voltage AC Withstand Testing Advanced AC Resonance Test Equipment for Power Cables, Transformers, GIS and Electrical Substations

The Variable Frequency Series Resonant Test System is a professional high-voltage testing solution designed to perform AC withstand voltage tests on capacitive electrical equipment. It is widely used by power equipment manufacturers, electrical testing laboratories, power utilities, EPC contractors, and electrical installation and maintenance companies.

The system adopts variable-frequency series resonance technology. By adjusting the excitation frequency, the inductive reactance of the high-voltage reactor can be matched to the capacitive reactance of the test object, establishing resonance within the configured operating range. This enables the system to generate the required high AC test voltage while the power supply primarily compensates for circuit losses.

Compared with conventional test arrangements that must directly supply the full reactive power of a highly capacitive load, a properly designed series resonant system can reduce the required input power and improve suitability for testing large-capacitance equipment.

The system can be configured according to the required test voltage, rated capacity, test-object capacitance, operating frequency, test duration, and applicable standards.

A typical system consists of a variable-frequency power supply, excitation transformer, high-voltage resonant reactor, capacitive voltage divider, control and measurement unit, and associated connection accessories.

• Variable-frequency resonance control for AC high-voltage testing.

• Configurable voltage and capacity ratings.

• Modular high-voltage reactor design for flexible configuration.

• Suitable for capacitive loads within the specified operating range.

• Reduced input power requirements compared with direct high-power test arrangements, subject to the test conditions.

• Adjustable test voltage and frequency.

• Digital voltage measurement and test data recording, depending on configuration.

• Overvoltage, overcurrent, and other configured protection functions.

• Suitable for laboratory and on-site testing applications.

• Customized solutions for different voltage classes and test objects.

• High-voltage and extra-high-voltage power cables

• XLPE cable installation acceptance testing

• Power transformers and reactors

• Gas-insulated switchgear (GIS)

• High-voltage circuit breakers and busbars

• Generators and selected rotating electrical machines

• Electrical substations

• High-voltage testing laboratories

• Electrical installation and maintenance projects

Please provide your required AC test voltage, equipment under test, cable length or test-object capacitance, test duration, and destination country. Our engineering team can evaluate the requirements and prepare a suitable technical proposal and quotation.