INS Kolkata Class Destroyer Ship Electrical System

The electrical system of the Kolkata class destroyer warships consists of total 14 EDCs (Energy/Electrical Distribution Centre) - 7 in FWD section and the other 7 in AFT section of the ship. There are total 4 feeder circuits - 2 in FWD section and the other 2 in AFT section.
There are total 5 alternators - 4 gas turbine AC generators (GTG) / Alternators (Wartsila WCM 1000) namely J1, J3, M2, M4 and 1 diesel alternator K manufactured by Kirloskar Electricals.
Each of them have 3 phase output voltage in the range 380-400 V, output current of 2500 Amp and power output of 1 MW.
Their operation temperature is maintained as - Operating Temperature <= 500 degree Celsius.
Normally, the GTG J1 and J3 are used in the FWD section whereas M2 and M4 are used in the AFT section of the ship.
The diesel alternator K is common to both the sections of the ship.
The EDCs are the interface circuitry between the alternators and the bus circuitry.
The feeder circuitry functions as an interface between the bus circuitry and the ship’s on-board electrical equipment.
The power generated by the alternators energizes the bus circuitry.
More than one alternator can be used to energize the bus by combining them and putting their output in parallel connection.
The combination or separation of the alternators is controlled through the EDCs.
The alternator outputs are connected or disconnected from the bus through their individual EDCs for e.g. EDC 1, 2, 13, 14.
The EDCs generally consist of heavy duty circuit breakers and relays. The EDCs can be operated manually or in semi-automatic mode. The automatic operation can be executed through electronic controller units (ECU).The semi-automatic and fully automatic mode of operations require some amount of manual monitoring at regular time intervals.
The feeder network consists of circuit breakers, current limiting, over voltage protection and voltage regulating circuitry.
The alternators in the FWD section can also be used to energize the AFT section of the ship and vice-versa.
The diesel alternator K is used in the case of emergency situation or when the ship is on shore as an alternate mode of electrical power supply. While sailing ashore, the GTGs are used.
When the ship is docked on shore, the shore supply is coupled to the EDCs instead of the alternator power output through Shore Control Box (SCB).

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