Basic Principle of Variable Frequency Series Resonance:
The variable frequency series resonance withstand voltage test uses the inductance of the reactor and the capacitance of the test object to form an LC series circuit. By adjusting the output voltage frequency of the variable frequency power supply, series and parallel resonance is achieved, obtaining high voltage on the test object. This is a new method for high voltage testing, highly praised by experts, and has been widely used domestically and internationally.
2. Features of the Variable Frequency Series Resonance Test Device:
The variable frequency series resonance test device has a large output capacity, high output voltage, and can arbitrarily combine reactors for AC withstand voltage tests on different test objects.
The variable frequency series resonance test device is small in size and light in weight, with each piece weighing no more than 50kg, making it particularly convenient for field tests.
The variable frequency series resonance test device has good protection functions, including overvoltage protection, overcurrent protection, time protection, flashover protection, overheat protection, and module protection.
The variable frequency series resonance test device is extremely simple to operate and has both manual and automatic modes.
The variable frequency series resonance test device uses a large screen, making test data clear at a glance, and can print test results.
The variable frequency series resonance test device has no risk of overvoltage after the test object breaks down, causing relatively little damage to the test object.
The variable frequency series resonance test device requires small power supply capacity for testing, only a fraction of that required for power frequency transformer testing, solving the problem of difficulty in finding power sources on site.
3. Scope of Application:
Suitable for AC withstand voltage testing of 400mm2/35kV cross-linked cables with a length of 2000m.
4. Environmental Conditions for Use:
1 Ambient temperature: -10℃ to 40℃
2 Relative humidity: not more than 90%
3 Altitude: below 2500 meters
5. Standards Referenced and Implemented for Equipment Manufacturing
1 DL/T849.6—2004 High voltage resonant test devices;
2 GB 6450—1986 Dry-type power transformers;
3 DL/T848.2—2004 Test transformers;
4 GB/10229—1988 Reactors;
5 GB/T11920—1989 General technical conditions for control devices;
