Variable Frequency Resonant Test System

Product Introduction

The variable frequency resonant test system is used to conduct AC withstand voltage test on site for objects, including power cables.

At power frequency, since the large capacitance of test objects and required voltage, the power should be high. This system is characterized by small dimension, light weight and easy moving and can be composed by modules which can be combined in several ways. Its main components are frequency converter, HV reactor, capacitive voltage divider, and exciter transformer.

A variable frequency resonant system takes advantages of resonance theory. To achieve resonance, the capacitive reactance has to equal the inductive reactance (high voltage reactor). In a variable frequency resonance system, the reactor is non~variable; therefore, the frequency of the circuit is adjusted until resonance is achieved. This adjustment of the resonant circuit is commonly referred to as tuning.

Once the resonance has been achieved only the resistive (real) losses in the circuit have to be supplied. The output voltage and the incoming power drawn from the mains is a function of the Q or quality factor of the circuit. The higher the system Q is, the lower the incoming power requires.

Application

• AC withstand voltage tests for objects：

• SF6 switchgear

• GIS

• GIL

• XLPE power cable

• Power transformer

• Motor etc.

Product Features

• High Q value

• Transportable and easy to set up

• Wide variable frequency range: 20-300Hz

• Low partial discharge level

• Modules flexibly combined according to test requirements

• High voltage protection. High voltage protection is supplied to provide protection to the system when a test object breakdown or

• flashover occurs.