Nuetral Earthing Transformers
Nuetral Earthing Transformers
(OP)
Can anyone explain how a nuetral earthing transformer (NET) works.
We have a three phase 6.6Kv system where the generation has no NER. I would like to know & understand the basic principles of how it works. i.e from the fault on the bus-bar, how the NET detects the fault, how it limits the current and where it limits the current.
I have attached a document that is a basic drawing I have made from the information avalible.
Thanks in advance
We have a three phase 6.6Kv system where the generation has no NER. I would like to know & understand the basic principles of how it works. i.e from the fault on the bus-bar, how the NET detects the fault, how it limits the current and where it limits the current.
I have attached a document that is a basic drawing I have made from the information avalible.
Thanks in advance






RE: Nuetral Earthing Transformers
Welcome to eng-tips!
There are a bunch of fellows who know this subject way better than I do, so wait for their responses too.
The attached pdf files did a pretty good job of helping me to understand.
Best to you,
Goober Dave
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RE: Nuetral Earthing Transformers
RE: Nuetral Earthing Transformers
Best to you,
Goober Dave
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RE: Nuetral Earthing Transformers
4160V pri: 240V secondary stepdown transformer. When 2400V is applied to the primary, 138V
is the voltage on the secondary. This would equate to a 86.5 amps and 1.6
ohm resistor across the secondary to limit the primary to 5 amps at 2400V.
If you use this transformer you will need atleast a 20.76kva transformer.
The reason for this is because you aren't using a direct 2400V pri: 240V sec
transformer and using those voltages. Since the voltages of the transformer
and the application differ, a derating is required.