1
Reduction in Downtime via Interlocking
Date: 3rd March 2012
A tripping occurred since the Areva panels had a tripping command system if the DC supply failed.
This was removed by removing that function from the panel and a alarm using a contractor with a reset operation was made
For future purposes a downtime of 60 minutes was avoided.
2
How did the failure happen?DC Input to the battery charger
failed
The auxiliary to the Panels was now
supplied by Battery storage
No DC failure sign was indicated
The Charge at Battery tank finished
after sometime
There was now no DC supply to the
panels
The Master relay of Areva Panels
Tripped since the battery voltage was
reduced
Incomer no. 3 and Unit 5 (south)
tripped
Load now concentrated only
on Dhaula
Bus coupler Tripped due to interlocking
to avoid overloading of Dhaula power
There was no supply to Unit 1, 2, 5 (south) and
Gyaanpeeth
While Unit 3, Unit 4 and Unit-5(North) operated normally
on Dhaula
3
K1 (N.C.)
Push Button (N.O)
K2 (N.O.)
a1 b1
g h
K2
K1
MCB Output
Fed byUPS Power
Hooter
SLD of the Hooter Circuit
K1 (N.C.) K2 (N.C.)
e f e1 f1
Fed byUPS Power
4
Load loss per hour 70,000INR
Breakdown on transmission line will create breakdown for hours:
60minutes
Total savings 70,000.00INR
Savings Calculations
Now if the DC fails the Hooter will show the fault.
There is also a ‘Reset Button’ to accept the fault and bring it back to normal condition.
This is not a one time saving it is applicable for the future also.
Now Downtime of Unit 1, 2, 5 and Gyaanpeeth from DC failure can be avoided.
Hooter would run and action can be taken in time.
*This is not a one time saving. For future there will be no downtime due to this reason.
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