design of substations to be based on the following
xii. Power Supply to the sub station auxillaries
a. AC Supply;
2 HT supplies shall be arranged from independent
sources. In addition, a DG set of suitable capacity to be
b. DC Supply:
2 sets of 220 V batteries each equipped with own
charger for substations of 220 kV & above. 2 sets of 50
V batteries for PLCC system.
400KV Sub-Station Bareilly
Bareilly sub station is completed during
1996-2000.The whole substation is divided
into three part 400kv,220kv and 33 kv and a
common control room is used
In an electric power system, switchgear is the
combination of electrical disconnect
switches, fuses or circuit breakers used to
control, protect and isolate electrical equipment.
Switchgear is used both to de-energize
equipment to allow work to be done and to
clear faults downstream. This type of equipment
is important because it is directly linked to the
reliability of the electricity supply.
Functions of switchgear:
One of the basic functions of switchgear is
protection, which is interruption of short-
circuit and overload fault currents while
maintaining service to unaffected circuits.
Switchgear also provides isolation of
circuits from power supplies. Switchgear is
also used to enhance system availability by
allowing more than one source to feed a