Co-Generation type Switchgear
Co-Generation type Switchgear
(OP)
All,
I am looking for technical data, typical vendors, who can or actually have used 15kv, 6000A, 60KA switchgear. I was able to find one at PACS industries, can anyone share me their experience?
Thanks,
Bpn
I am looking for technical data, typical vendors, who can or actually have used 15kv, 6000A, 60KA switchgear. I was able to find one at PACS industries, can anyone share me their experience?
Thanks,
Bpn






RE: Co-Generation type Switchgear
2000A, 21 kA symm. (500 MVA) is more common. But then I haven't seen it all.
Rafiq Bulsara
http://www.srengineersct.com
RE: Co-Generation type Switchgear
What is your application?
RE: Co-Generation type Switchgear
RE: Co-Generation type Switchgear
60kA at 15kV is one of the trade-offs generator manufacturers have to make. It's not a particularly high fault level by the standards of a generator bus. As David has said, the alternatives are insulate the stator to a higher level,or to run the machine close-coupled to the GSU transformer and synchronise at the HV breaker. The former solution makes the machine considerably larger and more expensive because of the amount of active material lost and replaced by insulation. The latter, if used in a multi-unit generating station, may increase the number of HV breakers required, which are even more expensive than the LV generator bus breakers.
I'll see if I can find a couple of links to gen breakers later on. The ratings are quite impressive.
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If we learn from our mistakes I'm getting a great education!
RE: Co-Generation type Switchgear
RE: Co-Generation type Switchgear
At this voltage I've seen 6000A switchgear, 63kA, arc-resistance to boot made by Powell switchgear. I am sure there are others.
RE: Co-Generation type Switchgear
You need to look at the assymmetry, the associated large DC component and the long time to first current zero crossing. Generator breakers are a totally different animal to a distribution breaker, often comprising a bank of single-pole breakers.
Have a look at ABB's HECS range for a typical GCB: http://www.abb.co.uk/product/us/9AAC30200091.aspx
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If we learn from our mistakes I'm getting a great education!
RE: Co-Generation type Switchgear
RE: Co-Generation type Switchgear
For the OP, here's a Siemens product which looks like a great fit for your application. The HECS is a little on the large side. ht
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If we learn from our mistakes I'm getting a great education!
RE: Co-Generation type Switchgear
Use isophase bus to interconnect the generator, a dedicated generator breaker, and a GSU transformer. You can also direct tap the GSU isophase to feed the plant Auxiliary transformer for medimum voltage (6.6 kV, 4.16 kV or??). This is the design that the majority of combined cycle or cogeneration plants use.
Generator breakers can be supplied by ABB, Areva (now Alstom?), Hitachi, Siemens, and another Asian supplier that I can't recall right now (Hyundai, Toshiba?). All build to the ANSI or IEC standard. Pricing is very competetive.
This gear is not draw out. Everyhting is fixed in place and can be equipeed with built in disconnect switches and grounding switches.