Interested to Buy Any Domain ? << Click Here >> for more details...
What are the protection schemes used for protection of
transformers ?
- 3 Answers
- 8362 Views
- Engineers India Limited, I also Faced
- E-Mail Answers
Answer Posted / s naved masood
For Transformers lesser than 1000KVA
1. Overcurrent protection at HT(fuses or overcurrent relays)
2. Overcurrent protection at LT (LT Air circuit breaker)
3. Moisture protection (Breather with silica gel)
4. Overburden protection (Temperature gauge)
5. surge protection (surge arrestors)
6. Pressure relieve valves
For transformers equal to or above 1 MVA
1. Overcurrent (IDMT and High set char relays)
2. surge protection (surge arrestors)
3. Oil temperature indicators (alarm + trip)
4. Winding temp indicators (alarm + trip)
5. Oil surge relay
6. Pressure relieve valves
7. sudden pressure relays
8. differential Protection
9. Restricted earth fault protection
10. Overfluxing protection
11. Buchholz relay (alarm + trip)
Also there are various tests that are done as a part of preventive maintenence.
1. winding resistance
2. turns ratio
3. Tan delta
4. Dissolved gas analysis
5. Furon analysis
6. Sweep frequency responce analysis
7. Partial discharge
8. Magnetic balance
10. Megger testing
| Is This Answer Correct ? | 18 Yes | 0 No |
Post New Answer View All Answers
is that any software calculator to calculate the size of cable
for what purpose the star point is done in ct
during installation time of transformer and alternator which points we have to observed?
Can we use BS 6651 and BS EN 62305 standards for computer room lightning ptotection in substation?
What is method of calculating the fault current for a MDB, 50KW, 3PH, 415V, 50HZ?
What is nichols chart?
Define noise?
1.4 What is meant by CT knee point voltage and how would you determine it
Battery is a voltage source? give one example of current source and why?
WHY BREAKER ARE USED IN SUBSTATIONS?
which IS or IEC is used for earthing,breakdown voltage of transformer oil, hv/pd testing and all type of electrical testing
in an electronic tri vector meter when the current and voltage sequence changes ? what is the effect of phase sequence on recording of meter
working principle of oil startar
by using pump duty, how we will can calculate the motor duty(KW)? is there any standard or formula.
Usually in the L & T make MCC feeders' power circuit,we have BMR after the MAIN CONTACTOR.,can we interchange their position, keeping the control logic same???
