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.
| 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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