Wfg42438
Electrical
- Apr 10, 2017
- 67
Hello Everyone,
In the past, I have heard many engineers place high importance on modeling a generator's decrement Curve.
My basic understanding is that this curve represents the fault current that the generator can produce in the case of a 3-phase fault at the generator terminals.
What I need some clarification on is how this curve affects the protective device trip curve settings.
I know for example for a transformer we want to make sure our trip curve is to the left and below the XFMR damage curve.
However for a generator's decrement curve what exactly is the goal at hand or rule of thumb when adjusting the trip curve of an Overcurrent relay for the generator?
Shown below are generic TCC samples I found online, any help or guidance on this would be much appreciated!
In the past, I have heard many engineers place high importance on modeling a generator's decrement Curve.
My basic understanding is that this curve represents the fault current that the generator can produce in the case of a 3-phase fault at the generator terminals.
What I need some clarification on is how this curve affects the protective device trip curve settings.
I know for example for a transformer we want to make sure our trip curve is to the left and below the XFMR damage curve.
However for a generator's decrement curve what exactly is the goal at hand or rule of thumb when adjusting the trip curve of an Overcurrent relay for the generator?
Shown below are generic TCC samples I found online, any help or guidance on this would be much appreciated!
