TROUBLE SHOOTING OF TRANSFORMER
TROUBLE SHOOTING OF TRANSFORMER
NO.
TROUBLES
CAUSE
ACTION
1
Stop of transformer
(Except OLTC)
Internal fault of
main tank
(1) Check on relay  
     operation.
(2) Electrical tests
-1  Measurement of insulation resistance

-2 Measurement of winding resistance

-3 Measurement of voltage ratio.

-4 Measurement of exciting current
(3) Gas analysis of    
     transformer
1-1
Operation of differntial relay and buchholz relay or pressure relief device operate simultaneously
 (1) Internal fault
Action shall be same as internal
fault procedures.


1-2
Operation of buchholz relay and pressure relief device
 (2) Internal fault
Action shall be same as internal
fault procedures.
1-3
simultaneously
Operation of
differential
relay only
 (1) Internal fault

 (2) Inrush current        
      at time of       
      energyization
(1) Action shall be same  
     as internal fault
     procedures.

(2)-1 Setting values of
        relays.
  (2)-2 Value of inrush   
          current.
1-4
Operation of buchholz relay (trip) only
 (1) Internal fault

 (2) Faulty   
      operation
(1) Action shall be same as internal fault procedures.

(2)-1 Check wiring.
(2)-2 Check contacts.
1-5
Operation of pressure device Only
 (1) Interal fault
 (2) Faulty Operation
(1) Action shall be same as internal fault procedures.
(2)-1 Check wiring.
(2)-2 Check contacts.
1-6
Winding temp.
indicator or
oil temp. indicator
 (1) Internal fault
 (2) Faulty operation
 (3) Stop of cooling   
      fan.
(1) Action shall be same as internal fault procedures.
 (2)-1 Check wiring
 (2)-2 Sudden variation of oil  temperature.
(3)    Check cooling fan.
2
Operation of
buchholz: relay
(alarm) only
 (1) Internal fault
 (2) Trapped air or   
      evoluation of   
      dissolved gases
 (1) Action shall be same as    
      internal fault procedures.
  (2) -1 Analysis of gas   
           accumulated
  in Buchholz Relay.
 (2)-2 Sudden variation of oil    
          temperature.
3
Operation of relays such as overcurrent relay, ground relay, arrestor etc.

(1) Internal fault
(2) External faults such as short- circuit
In the system


(1) Action shall be same as   
       internal fault procedures.

(2) -1 Check any sign of
         Heavy current
            circulation in the
            windings.
(2) -2 Check any sign of
          on-load tap changer interrupting heavy short-circuit current.
(2) -3 Short-circuit current value, its duration time.



4
Abnormality is found in recording devices
- ditto -
- ditto -

         High   
 temperature rise
Period required to Reach the maximum temperature and ambient temperature, Load factor or type of load. Connection diagram of bank and internal connection tap voltage.

    If the oil temperature is about 80`C over, the transformer must not be operated continuously.

Burned coil
Date and time of burning.       Installation site. Perod of use(immediately after operation period). Cause of failure:
   Overload
    Lighting
Short circuiting
(internal or external)
Others
Existence or absense of copper powder. Operation of protective devices (primary and secondary)



  Local heating

Heated point. Load factor or type of load. Smoke.   Discoloration.






Insulation resistance
failure
Insulation resistance:     
  
High voltage winding to low voltage winding and tank. Low voltage winding to high voltage winding and tank.
High voltage winding to low voltage winding. Temperature and humidity at which mea surement is made.
Installation site (indoors or outdoors). History of the transformer.
Dielectric strangth of the insulation oil.



Noise
Operating conditions
(overload, normal)

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 )

Post a Comment

  1. oZzy moved away ever before, I miss his cock, and
    i am always hungry for intercourse.
    FUCK MY PUSSY!

    My web site :: hcg injections
    Also see my webpage > hcg injections

    ReplyDelete
  2. You rеally make it sеem so еaѕу with yοur prеsentation but I find thіs matter to be гeally
    something that I thinκ I ωould neѵer undеrstand.
    It ѕеems too сomplex anԁ еxtremеly broаd
    for me. I am looking fогward foг yоur next post,
    I will try to get the hang οf it!

    My ωеb page ... ohm'S law

    ReplyDelete

 
Top