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.


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.
Relay (No. 48) actuation for incomplete tap changing.
     Diverter switch.
(1) Action shall be same as diverter switch fault.
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.
معلومات عن التدوينة 21 فبراير 2014 عدد الزيارات: (850) عدد التعليقات: 2 الكاتب:iHussam للإبلاغ عن رابط معطوب اضغط هنا للإبلاغ عن رابط معطوب اضغط هنا جميع الحقوق محفوظة ( إتفاقية نقل ونشر المحتوى )

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