Widely fluctuating mains supply is always a cause of concern to the user of modern precision and sophisticated Electrical and Electronic equipment, like computer & NC/CNC machine tools. Even the performance of more rugged equipment like induction Motors & heaters, deteriorates with fluctuating supply voltage.

"SEI " Servo - controlled Voltage Stabilizer is an effective & economic solution to this cronic problem. These are made in large varieties to meet every need of all types of industries.

SPECIFICATION: -
*Any one output will be available.
Non standard models are made to customer's specific requirement to cater any other input voltage range / output voltage/ frequency/ capacity etc.

3 Phase models with single voltage-sensing relay and single drive motor are suitable for fairly balanced supply voltage and load.

To over come unbalanced voltage and load conditions, 3 Nos 1 Phase units mounted in a single cabinet and connected in star are recommended.

BUILT IN A FEATURE: -

• A Voltmeter with switch to indicate input/output voltages.
• Long term stability 1%.
• Output Setting - 5 Volts by a lockable potentiometer.
• High efficiency above 95%.
• Indication for "Power ON", "Input too low" & "Input too high".
• A drive motor of special construction having high torque, low speed output with instant start/stop/reverse characteristic and short circuit proof.

CONSTRUCTION :-
Lower capacity units, up to 50 KVA are in air cooled single unit construction. Higher capacity units will be in two piece construction for the convenience of transportation & installation. Inter connecting cables/busbars will be provided with the equipment. Both section will be floor mounting type, and either one or both may be oil cooled depending on requirement.

OPREATION :-
The voltage stabilizer works on a simple principal of adding or a substracting a voltage to the supply voltage in appropriate quantity to correct it to the required level. This voltage to be added or substracted is obtained from the main itself, using a VARIPaC - a continuously variable voltage auto Transformer , driven by a servo motor under the control of voltage sensing relay. This relay senses the output voltage continuously with a highly stable reference and directs the drive motor to correct the output voltage to the set level.

SALIENT FEATURES :-

• Fully solid state voltage sensing relay using professional grade components.
• No relays - No Chattering - No RF interference.
• Fast acting.
• Fully tropicallised, most suitable for weather conditions prevailing in Indian sub - continent.
• Variable transformer and voltage sensing relay - most important components are made in house under strict quality control.
• Variation in the supply , frequency and load p.f. has no effect on the output voltage setting.
• No harmonic destortion is introduced by the stabilizer.

OPTIONAL FEATURES :-

• Suitable switch fuse unit on input/ output side.
• Over voltage / under voltage protection relays.
• Over load protection relay.
• Remote sensing facility.

SEI AC voltage stabilizer confirm to IS - 9815.

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