High Voltage Booster
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The high voltage test transformer is produced based on the Ministry of Machinery and Electronics' "Test Transformer" standard, with extensive improvements over the original similar products. The AC/DC high voltage test transformer is a new type of product produced after improvements according to the national standard "JB∕T 9641-1999" based on the YD series test transformer.
Classification
YDj oil-immersed high voltage test transformer: large capacity, cheap price, easy maintenance, mainstream product.
YDQ inflatable high voltage test transformer: good arc extinguishing performance, light weight.
GTB dry-type high voltage test transformer: light weight, small volume, can be placed upside down, expensive.
YD(C) cascade high voltage test transformer: small capacity, low voltage, light weight, easy to transport and install.
Capacity Selection of Test Transformer
The formula for determining the nominal test transformer capacity Pn: Pn=KVn2ωCt×10-9.
Where: Pn----nominal test transformer capacity (KVA).
Vn-----effective value of the rated output high voltage of the test transformer (KV).
K-------safety factor. K≥1, when nominal voltage Vn≥1MV, K=2, when nominal voltage is lower, K value can be taken higher.
Ct------capacitance of the test object (PF).
ω----angular frequency, ω=2πf, f-----frequency of the test power supply.
The capacitance Ct of the test equipment can be measured by an AC bridge. Ct varies greatly and can be determined by the type of equipment. Typical data are as follows:
Simple bridge or suspension insulators: tens of microfarads.
Power transformers < 1000KVA - 1000PF> 1000KVA 1000 – 10000PF.
High voltage power cables and oil-impregnated paper insulation: 250 – 300PF/m.
Enclosed substations, SF6 gas insulation: 100 – 10000PF.
For different test voltages Vn, choose different (appropriate) safety factors K. The K values selected for different Vn are listed above for reference:
Vn = 50 – 100KV K=4 Vn = 150 – 300KV K=3 Vn > 300KV K=2.
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
