YHXZB-Technical Scheme for 300kVA/50kV Variable Frequency Series Resonant Voltage Withstand Test Device
1Basic principle of frequency conversion series resonance:
1.1 Variable frequency series resonance withstand voltage test is a new method of high voltage testing that uses the inductance of a reactor and the capacitance of the test object to form an LC series circuit, adjusts the voltage frequency output of the variable frequency power supply, achieves series parallel resonance, and obtains high voltage on the test object. It is highly praised by experts and has been widely used at home and abroad.

2Characteristics of frequency conversion series resonance test device:
2.1 The variable frequency series resonance test device has a large output capacity, high output voltage, and the ability to freely combine reactors for AC withstand voltage testing of different test samples.
2.2 The frequency conversion series resonance test device has the advantages of small size, light weight, with each piece weighing no more than 50kg, and is particularly convenient for field testing.
2.3 The frequency conversion series resonance test device has good protection functions, including overvoltage protection, overcurrent protection, time protection, flashover protection, overheating protection, module protection, etc.
The 2.4 variable frequency series resonance test device has extremely simple operation and has two modes: manual and automatic.
The 2.5 variable frequency series resonance test device adopts a large screen, which makes the test data clear at a glance and can print the test results.
The 2.6 variable frequency series resonance test device has no risk of overvoltage after the test sample breaks down, and the damage to the test sample is relatively small.
The power supply capacity required for the 2.7 variable frequency series resonance test device is small, only a fraction of the power supply capacity required for the power frequency transformer test, solving the problem of difficulty in finding on-site power supply.

3Scope of application:
3．1Meet 400mm²/20kV cross-linked cable, AC withstand voltage test with a length of 2000m.

4. Environmental conditions for use:
4.1 Environmental temperature: -10 ℃ to 40 ℃
4.2 Relative humidity: not exceeding 90%
4.3 Altitude: below 2500 meters

5. Equipment manufacturing reference and execution standards
5.1 DL/T849.6-2004 High Voltage Resonance Test Device;
5.2 GB 6450-1986 dry-type power transformers;
5.3 DL/T848.2-2004 Test Transformer;
5.4 GB/10229-1988 Reactor;
5.5 GB/T11920-1989 General Technical Conditions for Control Devices;
5.6 GB/T16927.1-1997 High Voltage Test Techniques;
5.7 IEC358-1990 Coupling capacitors and capacitive voltage dividers.