Three phase SERVO Voltage stabilizer

Three Phase Oilcooled Servo Voltage Stabilisers are used to prevent the ingress of dust and foreign particles. The transformer oil is used for cooling transformers inside the voltage stabilisers. Smaller ratings are widely used in industries like Spinning Mills & Garment.

Higher rating oilcooled servo voltage stabilisers are used for large machinery, for a group of machinery or the entire factory. They are designed to suit Unbalanced Loads and Unbalanced Input Supply Conditions. Induction motors operate at high efficiency and improve power factor when supplied with constant voltages. These servo voltage stabilisers protect expensive manufacturing equipment from High/Low Voltages, thus cutting maintenance costs.

Technical Specifications:

Type of Stabiliser Three Phase Stabiliser - Unbalanced Type
Construction Indoor Purpose
Type of Design Servo Stabiliser with O/P sensing feed-back system
Type Of Cooling Oilcooled
Servo Motor Type AC Synchronous Stepper Motor
Input Voltage Range 360V - 460V /340V - 460V / 340V - 480V / 310V - 480V

Designed as per customer requirement
Input Frequency 47 Hz - 53 Hz
Output Voltage 415 V; User Settable - 400 V (OR) 380 V (L - L)
Output Voltage Regulation ± 1 %
Control Design Microcontroller (DSP) based Control System
Waveform Distortion NIL (Output Waveform same as Input Waveform)
Effect of Load PF on O/P Voltage NIL
Correction Speed > 50 V/ Sec (Will vary for higher rating Stabilisers)
Response Time 10 milli sec
Efficiency ≥ 98 %
Under / Over Voltage Cut-Off Upper Limit +5% (Above set O/P Voltage)

Lower Limit -10% (Below set O/P Voltage)
Short Circuit Protection HRC Fuse (OR) Optional MCB / MCCB at Input
Output Over Load Protection Electronic Operative above 110% of rated output current
Phase Reversal Protection Built-in
Single Phasing Prevention Built-in
Stabiliser “ON/OFF” Operation User Settable Auto Restart 1 sec - 998 sec

User Settable Manual Restart
Display Type Backlight LCD Display (Will vary as per the Control system)
Parameters Displayed I/P & O/P Voltage (L-L & L-N), Hz, Amps R-Y-B

Will vary as per the Control system used
Front Panel Indications LED Indication for - Input Present, Output Normal
Front Panel User Interface MENU, UP/DOWN KEY, ENTER/SET KEY
Event Recorder Fault Analysis - Check for the Control System Used
Input / Output Connection Input / Output — Terminal Plate with Nut-Bolt arrangement
Emergency Manual Bypass Built-in (Upto 250 kVA Ratings)
Output Contactor Built-in (Upto 250 kVA Ratings)
Surge Protection Device (SPD) Optional
Ambient Temperature 0° C to 50° C
Rating in kVA 3 kVA to 2000 kVA
Design Standards As per IS:9815

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