Battery Charger(DC System)RGTPP HISAR 2x600MW

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Battery ChargerRole Of Battery ChargerTo supply load requirement in normal conditionTo ensure float (low current) charging of batteriesTo ensure boost charging when batteries are discharged

Dual Charging Modes (Rectifier)Float Charger (Constant Voltage)Boost Charger (Constant Current)

Dual Mode Of OperationAuto ModeManual Mode

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Types of Battery Charger at RGTPPBattery Chargers used at RGTPP are:48 AH, 25 A/ 220 V Float cum Boost Charger300 AH, 45 A/ 220 V Float cum Boost Charger2140 AH, 330 A/ 220 V Float cum Boost Charger

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Manufacturer: Chabbi ElectricalsInput supply: AC supply, 3 phase, 415 V +/- 10%, 50 Hz

Two modes of operation:Float mode: Used to supply 240V to the system and give trickle charges to the battery bank to maintain the voltage of bank. Under normal conditions, the charger is always on float mode. It is a constant voltage source.Boost mode: When the batteries are discharged only than the charger is switched to boost mode to charge the discharged batteries. It is a constant current source. Under this mode you can control the current output through current limiter switch.

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Float ModeUnder healthy conditions, the charger supplies the dc load in float mode.Under float mode, charger supplies the load and also charges the batteries at trickle rate.Float mode is a constant voltage source and voltage output is 240V.

Boost ModeBoost mode is used to charged the discharged battery bank.It is a constant current mode and current can adjusted by the current limit switch on the charger panel.Charger can go on the boost mode only when the DCDB incomer is in OFF position.

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Scheme of Charger

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Thyristor Based Rectifier Bridge

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Operational featuresOperation panelThyristor based rectifier unitFloat cum boost switchTransformerCPC cardAnnunciation panel

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Operational Panel

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Thyristor based rectifier unit

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Float cum boost switchBy operating the given switch with the float cum boost key the charger can be operated in boost and float mode.The boost current limit switch is used limit the output current in the boost mode

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Transformer

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CPC cardAll the operation of the thyristors are regulated by the CPC card given.It controls the gate pulse to trigger the thyristor.It is an electronic card.

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Annunciation panel