Our Products

We manufacture high efficiency servo controlled voltage stabilizers which are suitable for weather conditions in Indian subcontinent. It works effectively under voltage fluctuations and helps in obtaining one output. It is fast acting, and any variation in the supply, frequency, load and P.F. does not have effect on the output voltage setting. The stabilizer is provided with a fully solid state voltage sensing relay using professional grade components. The important components of the stabilizer are made under strict quality control.


Features

• The servo stabilizer has a long term stability and efficiency as high as 95%.
• It is provided with a drive motor that has a high torque, low speed out put and short-circuit proof.
• It has an output setting of /- 5 Volts and a proper indication for "Power ON", "Input too low" & "Input too high".

Specifications
Standard models SEI Voltage stabilizers are made to following specifications :

	1 Phase	3 Phase
Input	180V – 260V	360V – 460V
Output	230V - 240V*	380 / 400V / 415V*
Frequency	50 / 60 Hz
Capacity	1 KVA to 1000 KVA

*Any one output voltage will be available.
Non standard models are made to customer's 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 Features

• A voltmeter with switch to indicate input / output voltages.
• Long term stability of ± 1%
• Output setting - ± 5 Volts by a lockable potentiometer
• High efficiency above 95%
• Indications 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 characteristics and short circuit proof

Construction : The voltage stabilizers are air cooled/oil cooled constructed depending on requirement of the customer

Operation
The Voltage Stabilizer works on a simple principle of adding or a subtracting a voltage to the supply voltage in appropriate quantity to correct it to the required level. This voltage to be added or subtracted is obtained from the mains 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, compares 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
• 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 stabilizers confirm to IS-9815