EQUIPMENT OF VEMIGIRI 400/220 KV SUBSTATION
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INTRODUCTION
The 400/220KV sub station, Vemagiri was commissioned at16:35 hrs on 10/09/2005 by energising the bus 1 from 400KV Kalapaka-Vemagiri circuit-1. It is located near to NH-5 opposite to Andhra Bhoomi press, at Vemagiri village in Kadiyam mandal, East-Godavari District which is at a distance of 10KM from the RJY Railway station. The construction of the project was taken up under the scheme of the SIMHADRI-VIZAG power transmission systems with financial assistance of Govt of Japan through JBIC. Initially the sub station was energised with 24no bays with 14nos 400KV feeders and 4nos 200KV feeders.


Elements of a substation
Substations generally have switching, protection and control equipment and one or more transformers. In a large substation, circuit breakers are used to interrupt any short circuits or overload currents that may occur on the network. Smaller distribution stations may use recloser circuit breakers or fuses for protection of distribution circuits. Substations do not usually have generators, although a power plant may have a substation nearby. Other devices such as capacitors and voltage regulators may also be located at a substation.


Transmission substation
A transmission substation connects two or more transmission lines. The simplest case is where all transmission lines have the same voltage. In such cases, the substation contains high-voltage switches that allow lines to be connected or isolated for fault clearance or maintenance. A transmission station may have transformers to convert between two transmission voltages, voltage control/power factor correction devices such as capacitors, reactors or static VAr compensators and equipment such as phase shifting transformers to control power flow between two adjacent power systems.