Hydro Generators at speed no load.
Hydro Generators at speed no load.
(OP)
How long can a hydro synchronise generator be at speed-no-load and not tied to the system? Do you just use this setup for testing?
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Hydro Generators at speed no load.
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Hydro Generators at speed no load.Hydro Generators at speed no load.(OP)
How long can a hydro synchronise generator be at speed-no-load and not tied to the system? Do you just use this setup for testing?
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RE: Hydro Generators at speed no load.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Hydro Generators at speed no load.
Assuming I understood what you were asking.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Hydro Generators at speed no load.
An operator on Friday went from full load to SNL and opened the Gen Breaker, Wicket gates were at 10%. This continued for 8 hours. Note: This unit was not condensing.
I was under the impression when the unit is tied electrically to the grid it is in a much more stable condition since its being controlled by frequency via the Governor System - versus untied and being controlled by just the governor system.
Also with the Gen Breaker open is all relay protection still in place?
I've been operating for 34 years and have never seen this done. I dont understand the logic here - simply why would some one think it is ok to do that? This is a new guy.
RE: Hydro Generators at speed no load.
RE: Hydro Generators at speed no load.
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Hydro Generators at speed no load.
Bill
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"Why not the best?"
Jimmy Carter
RE: Hydro Generators at speed no load.
When I visited a hydro plant with synchronous condenser capability, the operator explained that the condenser units are dewatered using compressed air after synchronization so that they spin freely.
RE: Hydro Generators at speed no load.
rasevskii
RE: Hydro Generators at speed no load.
The Walley are fine, G&F shock the fish every spring to bleed their eggs for the fish hatchery. I tried throwing a net back there once - they didn't care for it much.
Thanks again
RE: Hydro Generators at speed no load.
RE: Hydro Generators at speed no load.
RE: Hydro Generators at speed no load.
or
Do you throw electrodes in the water and shock Walley electrically?
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Hydro Generators at speed no load.
Muthu
www.edison.co.in
RE: Hydro Generators at speed no load.
Since the above were equipped with turbine-type runners and cavitation became a definite problem at any wicket gate opening below about 70%, operation at SNL was avoided as much as possible, and minimized when unavoidable.
As bacon4life alluded to, units whose runners are sited below tailrace elevation can employ compressed-air 'tailrace suppression' to enable units to stay on line as synchronous condensers, but this is an expensive option and would have to have a significant favourable cost-benefit ratio to even be considered.
Question: was there a new requirement to provide a minimum flow over downstream riffle beds where fish might rest and recoup before attempting to jump some falls or rapids?
RE: Hydro Generators at speed no load.
Some of us use the hydro units more as a control for water, not just power. So it might be assumed they were just letting water through, because they did not need the energy.
RE: Hydro Generators at speed no load.
Wolf
RE: Hydro Generators at speed no load.
Even though the generator breaker is open, protection is typically still in service (don't typically monitor breaker status to activate protective relays). Relays typically monitor the breaker status and are smart enough to know what to activate etc. A big factor here could be the switchyard configuration.