Circuit Breaker Test CHECKLIST

Transcription

1 Circuit Breaker Test CHECKLIST Zensol recommends this list of important points in order to be well prepared to perform tests using a circuit breaker analyzer. This process will also help you analyze the results more effectively. A. Before testing (11 points) Step Description Results A1 A2 A3 A4 A5 A6 Make of Circuit Breaker Model of Circuit Breaker Number of contacts Circuit Breaker build date Circuit breaker voltage rating (KV) Number of breakers similar to the one tested A7 CB user manual YES NO A8 Picture of the Circuit breaker YES NO A9 Do you know where to install the displacement transducer? YES NO A10 Do you know where to install the accelerometers? YES NO A11 Do you know where to install the cables? YES NO B. During the tests (8 points) Step Description Result B1 History of interventions on the Circuit Breaker YES NO B2 Make sure the mounting base to screw the accelerometer is properly glued YES NO B3 Ambient temperature C B4 Picture of circuit breaker nameplate YES NO B5 Overall picture of circuit breaker YES NO

2 B6 Picture showing location of accelerometer YES NO B7 Picture showing location of cables and clamps YES NO B8 Ensure presence and viability of data files for analysis (raw data) YES NO C. After testing (7 points) Systematic analysis method Step Description Result C1 Perform an Excel export to obtain an overview of the results YES NO C2 Timing conformity with manufacturers recommendations YES NO C3 Attempt to associate the impacts with the CB mechanism in order to identify and locate events in the vibro-acoustic signature YES NO C4 With all the elements gathered before and during the tests, we recommend the following visual analysis: Timing analysis: -Verify that the timing is conform with the manufacturer s recommendations (excel report) Motion analysis: -Verify that the Total travel, over travel, bouncing and average speed are conform with the manufacturer s recommendations Vibration analysis: - Time between impacts (examine tool) - Shape (scale tool) - Amplitudes (examine tool) Superposing and comparing traces: - contacts of a CB compared to ones of the same type C5 Observation and identification of anomalies C6 Recommendations for future tests C7 Transfer and share with Zensol the data and pictures. YES NO

3 EXAMPLE A. BEFORE TESTING A1. Make of Circuit Breaker ABB A2. Model of Circuit Breaker HPL A3. Number of contacts 3 A4. Circuit breaker build date 2005 A5. Circuit breaker voltage rating (kv) 254kV A6. Number of OLTCs similar to the one tested: 6 A7. CB user manual:

4 A8. Picture of the Circuit Breaker:

5 A9. Do you know where to install the displacement transducer?:

6 A10. Do you know where to install the accelerometer?

7 A11. Do you know where to install the cables?

8 DURING THE TESTS B1. History of interventions on the Circuit Breaker: YES. B2. Make sure the mounting base to screw the accelerometer is properly glued: B3. Ambient temperature: 20 degrees Celsius. B4. Picture of the circuit breaker nameplate:

9 B5. Overall picture of the Circuit Breaker

10 B6. Picture showing location of accelerometer:

11 B7. Picture showing location of cables:

12 B8. Ensure presence and viability of data files for analysis (raw data): Extension: «.wdt»

13 B. AFTER TESTING C1. Perform an Excel export to obtain an overview of the results: Excel export: C2. Timing conformity with manufacturer recommendations YES C3. Attempt to associate the impacts with the CB mechanism: In this example, the motion has a bump at the same time the contact closes. This means the mechanical components are affecting each other.

14 C4. Suggested analysis: With all the elements gathered before and during the tests, we recommend the following visual analysis: Timing analysis: -Verify that the timing is conform with the manufacturer s recommendations (excel report) Motion analysis: -Verify that the Total travel, over travel, bouncing and average speed are conform with the manufacturer s recommendations Vibration analysis: - Time between impacts (examine tool) - Shape (scale tool) - Amplitudes (examine tool) Superposing and comparing traces: - contacts of a CB compared to ones of the same type C5. Observation and identification of anomalies: This example shows an assembly problem after some repairs on a HPL 230KV circuit breaker. Phase C Phase B Phase A

15 Here you can see the assembly problem. Inverted position Correct position C6. Recommendations for future tests: Ex: The impact s amplitude is very low. It would be preferable to change the location of the accelerometer for the next tests in order to have higher amplitudes. C7. Transfer and share with Zensol the data and pictures: YES.