TROUBLE SHOOTING OF O.L.T.C
5 | Malfunction in transformer ( in case of OLTC) | Driverter switch fault | (1) Electrical tests. a. Measurement of insulation resistance. b. Measurement of voltage rat. c. Measurement of exciting current. |
(2) Gas analysis of OLTC oil. | |||
(3) Check any operation of relay | |||
(4) Check any external short circuit. | |||
5-1 | Operation of Buchholz relay simulationeously. | (1) Diverter switch fult. | (1) Action shall be same as diverter switch fault. |
(2) Faulty operation of relay | (2)-1 Check wiring. (2)-2 Check contacts. | ||
5-2 | Relay (No. 48) actuation for incomplete tap changing. | Diverter switch. | (1) Action shall be same as diverter switch fault. |
6 | Improper stopping positions due to incomplete tap changing or out-of stop in tap position | (1) Driving motor does not operate (2) Driving motor operare but incomplete tap-changing take place. (1) Excessive operating torque | (1)-1 Check any operation of circuit breaker, any improper voltage. (1)-2 Check motor, magnet brake pilot switches relays (No. 4866). (1)-3 Check control circuit. (2)-1 Check any slipping of magnetic brake. (2)-2 Check contact positions close and open. (2)-3 Check time setting value of relay No. 48T. (3)-1 Tap position where excessive torque ocurrs. (3)-2 Check torque value by manual operation at driving mechanism and its number manual operation. |
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