Three Methods for testing electromagnetic potential transformer
Publish Time: 2021-11-30 Origin: Site
Three Methods for testing electromagnetic potential transformer
1. Oil immersion, SF6 gas type and solid transformer three method for potential transformer testing
2. Electromagnetic potential transformer method outlines test cycle, test content and recommended products
3. This technical methods is in line with the relevant specifications of the "Power Preventive Test Procedures"
Testing Method One- Oil immersion type for Electromagnetic potential transformer
Testing Name | Testing Content | Reference Equipment |
AC withstand voltage testing | 1. primary winding 0.8 times vaule test based on factory vaule 2. The secondary winding and the ground power frequency withstand voltage are 2 kV (use Mega) 3. Crack-type or hierarchical transformer multiplier induction withstand voltage test, 4. If 110kV voltage capacity is 5%, 220kV is 10% | |
Water content in oil | The content of dissolved gas components in oil (μ L / L): H2：150 At 220kV, the C2H2 value is: 2 At 110kV, the C2H2 value is: 3 | |
Partial discharge test (PD Test) | In the 110KV and 220KV system, using oil-immersive method to test potential transformer, once voltage is 1.2 um√3, and the local discharge is not greater than 20PC. | Partial discharge test system |
Testing Method Two- SF6 Gastype for Electromagnetic potential transformer
Testing Name | Testing Content | Reference Equipment |
Water content in gas | The content of dissolved gas components (μ l / L) in the gas: H2: 150 At 220kV, the C2H2 value is: 2 At 110kV, the C2H2 value is: 3 | |
AC withstand voltage test | 1.Primary winding 0.8 times vaule test based on factory vaule 2.The secondary winding and the ground power frequency withstand voltage are 2 kV (use Mega) 3.Crack-type or hierarchical transformer multiplier induction withstand voltage test, If 110kV voltage capacity is 5%, 220kV is 10% | |
Infrared test | At least once per year | Infrared thermal imager |
Testing Method Tree- solid type for Electromagnetic potential transformer
Testing Name | Testing Content | Reference Equipment |
Anemone current and excitation properties | If there is no significant difference in the no-load current and the factory value at the rated voltage, no-load current at the following test voltage is not greater than the maximum allowable current: Neutral point non-effective grounding system: 1.9UN / √3; Neutral point grounding system: 1.5UN / √3 | |
winding connections and polarity | Checking winding connections and polarity whther is same as nameplate after replacing the windings. |
Note: Above electromagnetic potential transformer configuration are just a conventional configuration, just for reference only, if you have any product questions,please feel free to contact us!