This test aimed to test the closing/opening time for circuit breaker and to make sure that there is no pole discrepancies between poles (red, yellow and blue) and CB closing/opening time within acceptable range according to factory test result.
Timing test for Circuit breaker and megger test
Required equipment for Timing test for Circuit breaker
- EGIL breaker analyzer.
- B10E (used as DC supply and can resist high burden equipment).
- Merger.
- High potential test kit.
Timing and megger test connection
- Connect B10 as external DC supply for closing (in case of measurement of closing time) circuit or opening (in case of measurement of opening time) circuit, for switching device that should be tested.
- Connect breaker analyzer in the circuit of opening or closing using dry contact from device to give command of open or close to the switching device and take contact from this device to work as feedback signal from the device while being closed or opened to measure CB closing/opening time.
- After opening or closing, the breaker analyzer will print the result which should be compared with factory test result to be sure that result within acceptable range.
- To start megger test: inject 1 KV for 1 minutes, when breaker open inject between the same pole (red-red, yellow-yellow and blue-blue) and when breaker close inject between pole and ground, between pole to pole.
High potential AC test
Applying high potential AC voltage when the breaker in service position line to line and line to ground in the next article.
Industry coded for Circuit breaker testing
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
MOTOR SOLO RUN TEST PROCEDURE FOR INDUCTION MOTOR