Main keywords and important concept point for this articles are Voltage transformer, voltage transformer test, what is voltage transformer, VT test
Voltage transformer VT test procedure
This test also is considered as one of the main test and its purpose is to test:
- Voltage transformer ratio.
- Voltage transformer polarity.
- Voltage transformer winding
- Megger test (insulation).
Required equipment for VT Test
- CPC 100.
- Multi-meter (Fluke).
Mechanical checked and visual inspection for VT test
- Check tightness of connection.
- Check ferrules.
Voltage transformer test connection
- Connect two leads from CPC device to primary side of voltage transformer and other two lead of CPC with secondary side of VT, then press start from VT page of CPC.
- Using CPC with same connection but from different page, you can measure winding resistance.
- To check the loop burden: inject the rated secondary voltage and measure the current. Burden will be the injected voltage* measured current and then compare it with VT burden.
- Insulation test: Using megger to test insulation by 1 kilo volt injection for 1 minute, this test should be done between primary to secondary and secondary to ground, But for primary to ground 5 kilo volt injection for 1 minute.
- See figure below which shows connection of VT Test.
Industry coded for Voltage Transformer
NESC: National Electrical Safety Code
NFPA: National Fire Protection Association
NEC: National Electrical Code (2008 Edition)
ASTM: American Society for Testing and Materials
IEC: International Electrical Commission
IEEE : Institute of Electrical and Electronic Engineers
NETA : National Testing Association
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Main keywords and important concept point for this articles are Voltage transformer, voltage transformer test, what is voltage transformer, VT test.