Protection
Protection
(OP)
Could any body plz advise protection approach for dealing with utility,
some literature available on web in regard to co-gen applications.
I beleive there are some experts here on this. Any piece of word would be appreciated.
Thanks
some literature available on web in regard to co-gen applications.
I beleive there are some experts here on this. Any piece of word would be appreciated.
Thanks






RE: Protection
RE: Protection
RE: Protection
RE: Protection
Please see my question below:
we have a 500 kw co-gen at 600 V, which is still at design stage, actually we have to connect to existing distribution switchgear which is being fed from local utility. As waross said, discussing with local utility,
we will do that but what basic protection scheme can I go for, at this stage I need to get a basic understanding of
single line diagram involved. Plz advise where I can find some literture available on some basic schemes.
Thanks
RE: Protection
Reverse Current protection,
Over current protection,
Fault current protection, and
Acceptable Syncronizing gear.
The most basic system that I have seen was installed on a set of 2 600 KW sets and 3 350 KW sets., Prime power for a small community.
1> Fault current and overload protection.:
Provided by a circuit breaker. Further overload protection was provided by the "Dead Rack" setting in the engines fuel injection pump, which limited the maximum power output of the engine to 600 KW.
2> Reverse power protection was provided by a reverse current relay and a shunt trip in the main breaker.
3> Syncronizing was with a syncro-scope and manual closing of the main breaker.
There are a lot more desirable features which you will probable choose to add in the end. This will give you a very bare minimum to build on by adding other features.
yours
RE: Protection
RE: Protection
Protection functions you may care to become familiar with, in addition to those listed by waross, would be some form of zone protection (differential or REF) for the generator, and loss of grid connection (vector shift or ROCOF). In the UK, loss of grid protection is loosely referred to as 'G59' protection after the Electricity Associaition document G59/1 which details the requirements. Google on any of 'G59 protection', 'ROCOF', or 'vector shift' will find a lot of information.
The following document has some interesting discussion, although it is obviously biased heavily toward UK practice:
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RE: Protection
This might help a little, in addition to the other good comments above.
RE: Protection
My first step would be to ask the utility about the protection they would like you to have.
RE: Protection
Similarly, inverters for interactive solar generation include a relay that disconnects from the line when there is a power failure and can sense when 1 or more inverters are the sole source of power. Some of this is done with voltage sensing and some of this is done with impedance sensing. That is, the line impedance that a solar inverter sees changes dramatically when the utility opens its circuit breaker or fuse.