Power Frequency AC Withstand Voltage Test Device;Working Principle
1. AC, DC:
Input the power frequency power supply into the (or control console), and adjust the voltage through the auto voltage regulator to input into the primary winding of the test transformer. According to the principle, a power frequency high voltage can be obtained at the secondary (high voltage) side. This power frequency high voltage can be rectified and filtered by capacitor to obtain DC high voltage, whose amplitude is 1.4 times the effective value of the power frequency high voltage. However, when using DC, the short-circuit rod should be pulled out; when using AC, insert the short-circuit rod.
2. Test transformer with taps:
In order to simultaneously satisfy the contradiction between higher voltage and lower current, and lower voltage and higher current, the high voltage winding is divided into two windings, one with larger current and the other with smaller current. Then the two windings are connected in series and led out separately. The schematic diagram is shown below.
3. Cascade test transformer:
To obtain a test transformer with higher voltage, the cascade method can also be used to achieve higher voltage. Figure 2 shows the wiring diagram of a three-stage cascade test transformer. The capacity and voltage relationships of the three transformers satisfy: P1=2P2=3P3, U(total)=1U+2U+3U.
Power Frequency AC Withstand Voltage Test Device - Price Main Technical Indicators
: 1～300KVA Single unit rated output voltage:
(AC) 50, 100, 150, 200, 300KV
(DC) 70, 140, 210, 280KV
>Rated input voltage: 200V, 400V
> : 500/1, 1000/1, 1500/1, 2000/1, 3000/1
>Ratio error: ≤±1.5%
> : <10%
