-
is a transformer, or a bank of transformers, that
supplies the AC to power the auxiliary equipment and lighting in each station
Station Service
-
True/False
In Distributing Stations, unlike Receiving Stations, the bulk of the station service load is single-phase power
True
-
True/False
Distributing Stations usually have only one Station Service Bank.
Most have an alternate path to the Station Service power source.
True
-
What is the High protection for Station Service
- Fuses (liquid filled or expulsion types)
- Protective relays that trip CBs
-
What is the low side Station Service Protection
- Fuses (cartridge type)
- CBs (toggle type with thermal an/or magnetic elements)
-
Station Service high side protection is designed to interrupt the
total
connected load
-
The low side protection is designed to interrupt the
faulted circuit.
-
True/False
The DC system provides a source of power to the station that is
available regardless of the integrity of the AC system
True
-
Receiving Stations use a large size transformer, connected open delta, to supply .
3 phase 240/480V AC power
-
True/False
Receiving Stations usually have two separate station service banks, each capable of carrying total station service load
True
-
If station service is to out more than 2 hours, what do you do?
Arrange for a backup generator
-
What are some critical AC powered auxiliary devices supplied by Station Service
- • Bank cooling fans and pumps
- • Pumping equipment for 230kV oil cables
- • Battery charger
- • Synchronous condenser auxiliary equipment
-
What are some less critical AC powered auxiliary devices supplied by Station Service
- Station Lighting
- RTU battery charger
- Relay AC potential (34.5kV Capacitors)
- CB air compressors
- Alarm circuits
- etc...
-
What are some DC powered auxiliary devices supplied by Station Service
- • CB Controls (local and remote)
- • CB operating mechanism
- • Indicating lights
- • Relay protection
- • Alarm Circuits
- • Emergency Lights
- • Miscellaneous equipment when AC fails (clock, oscillograph)
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