Cleaned the Relays

The ordered relays have not been received until this afternoon, so I tried to clean the old relays by myself. Because the pin surfaces were burned very much, I have to file them so that pin thickness became less than before. In order to check the refurbished relays, I put them back to test, however the circuit breaker shut down once again. Then I disconnected the transformer output to purify the test condition, I found the relay K2 was close in the beginning. After 1 minutes time delay the relay K3 should be closed, but the circuit breaker was shut down while K3 was reacting. I estimated the primary problem is K3 caused circuit breakdown. The refinished relay K3 may not be used again.