High Voltage Withstand Tester
Darui Electric recommends for you:
The High Voltage Withstand Tester is suitable for insulation strength testing of various high-voltage electrical equipment, electrical components, and insulating materials under power frequency or DC high voltage in power systems, industrial and mining enterprises, scientific research departments, etc..
It is an essential and important equipment in high-voltage testing. It features small size, light weight, compact structure, complete functions, strong universality, and convenient use.
Main Features
◇ Adopts a unique structure of axisymmetric unequal-sided octagonal shell; can output dual high voltage.
◇ The oil level in the oil tank is lower than the tank edge, avoiding oil leakage.
◇ The wiring terminals are on the tank cover, avoiding collisions and improving mechanical and electrical performance.
◇ The product features compact structure, stable electrical performance, sufficient capacity, small size, light weight, and convenient use and maintenance.
Technical Parameters
◆ Product types: AC, AC/DC, AC series, AC/DC series.
◆ Input voltage: AC (0～200) V or (0～400) V.
◆ Output voltage: AC (0～200) kV or DC (0～280) kV.
◆ Capacity range: 0.5～200KVA.
◆ Rated capacitance: 1~400kVA;
Capacity Selection
The formula for determining the rated capacity Pn of the standard test transformer: Pn=KVn2ωCt×10-9
Where: Pn----rated capacity of the standard test transformer (kVA)
Vn-----effective value of the rated output high voltage of the test transformer (kV)
K------safety factor. K≥1, when the rated voltage Vn≥1MV, K=2; when the rated voltage is lower, a higher K value can be selected.
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
Simple graded bushings: 100 – 1000PF
Voltage transformers: 200 – 500PF
Power transformers: < 1000kVA - 1000PF
> 1000kVA: 1000 – 10000PF
High-voltage power cables and oil-impregnated paper insulation: 250 – 300PF/m
Gas insulation: - 60PF/m
Enclosed substations, SF6 gas insulation: 100 – 10000PF
For different test voltages Vn, select 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.
