Power Plant building
It is the place where two A C powers are generated in case of commercial
public power failure:
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No-break : All electronics equipment is fed by this uninterrupted
no-break power.
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Short-break: Power to non-operational impact devices such as air-conditioning,
lighting of buildings or antenna servos will be lost during a few seconds
in case of a commercial power cut
This building is divide in five main areas:
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Battery banks room
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Converters room
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Control room
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Transformers room
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Diesel Generators room
For those interested in technical details, see next paragraphs:
20 kV external commercial public power is routed to power plant building
through the prime feeder circuit breaker (1).
Two out of the three available 1000 kVA transformers (9
and 8 or 9 and 10) step down the external 20 kV to 390 V.
Two different powers are generated in this power plant in case of a
public power failure:
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No-break power
It is supplied by five AEG 80 kVA static converters (38,
40, 44, 46 and 48) connected in parallel. Each static converter has
its own battery bank in order to maintain the no-break power supply till
Diesel Generators Sets (DGS) are on-line. All station electronics (except
VIL2 and TS1 servos) are connected to no-break power.
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Short-break
It is supplied by four 400 kVA Diesel Generators Sets (20,
23, 26 and 29). They are connected in parallel. In case of a public
power failure, A C power will be lost momentarily in all devices connected
to short-break (air conditioning, lighting of all buildings....). As soon
as public power is lost, one master DGS will be started-up immediately
and then two other ones (depending of the load to be supplied) will be
synchronized automatically with the master DGS. Once they are all synchronized,
they will take all the short-break load. A C Power to all devices connected
to short-break will be delivered sequentially. The last one to be supplied
is the one with lowest priority and that corresponds to a maximum time
of 36 seconds without A C power. DGS's will be kept on till commercial
public power is restored.
An emergency by-pass device (50) allows to
connect the short-break line to no-break users without any interruption
in case it is detected a wrong parallel working condition of the operating
static converters. A dynamic 1 kW - 400 kW dummy load (54)
is provided for testing purposes of either the no-break equipment or any
DGS.
This room houses four 400 kVA Diesel Generators Sets. They are connected
in parallel. Three DGS are usually started-up (depending of the load to
be supplied) when there is a public mains cut. They will be kept on feeding
all station equipment till public power is back.
