The complete set of frequency conversion series resonance test equipment is mainly designed and manufactured for AC withstand voltage testing of electrical main equipment such as 10kV, 35kV cables, 35kV main transformers, busbars, switches, insulators, etc; It can meet the requirements of high voltage and low current equipment testing conditions, as well as the requirements of low voltage AC withstand voltage testing such as 10kV cables; Below, we will learn about the testing method of the complete set of variable frequency series resonance testing equipment:

1. Current selection

According to the required current IC of the electrical equipment, select the rated output current In in the frequency conversion series resonance test set device to be greater than the required current IC. That is, In>IC, the required current IC can be estimated according to the following formula, and the rated output current In of the test transformer is 770A.

2. Voltage selection

According to the requirements of the test voltage, select a suitable frequency conversion series resonance test equipment, so that the rated voltage UN on the high voltage side of the test transformer is greater than the test voltage UC, i.e. UN>UC. Secondly, check whether the low voltage side voltage required for the test transformer matches the on-site power supply voltage and voltage regulator.

The voltage value of the complete set of variable frequency series resonance test equipment should not only meet the requirements of discovering insulation defects and checking the electrical strength of the insulation of the test sample, but also try to avoid causing significant damage to the insulation during the test process. Therefore, determining the appropriate test voltage value is of great significance. Therefore, the rated voltage of the frequency conversion series resonance test set is set to UN=330kV.

3. Selection of Capacity for Frequency Conversion Series Resonance Test Equipment

The capacity of the complete set of frequency conversion series resonance test equipment should be as large as possible than the calculated results, because the test line and test equipment have stray capacitance to the ground, which makes the estimated test current smaller than the actual value. Testing with 50Hz voltage, due to the large capacitance of the cable line, a large capacity testing transformer, voltage regulator, and power supply frequency conversion series resonance testing complete set of equipment are required for testing.

4. Detection of insulation defects using a complete set of frequency conversion series resonance test equipment

Insulation defect detection is the most rigorous, effective, and direct detection method, which has decisive significance in determining whether electrical equipment can continue to participate in operation. It is also an important means to ensure the insulation level of equipment and avoid insulation accidents; The insulation defect detection is close to the insulation level of the operating conditions of the inspection equipment, which is a destructive test on the equipment. It may cause new damage to the insulation layer or exacerbate the original damage to the insulation layer, but these damages will not rupture during the pressurization time. The insulation damage caused is irreparable and permanent. If the complete set of frequency conversion series resonance test equipment continues to be put into use, it will suffer great damage.