Servo Control Voltage Stabilizer ( Oil Cooled )

No Potentiometer Adjustments, Full Digital Control

• All parameters are modified using the front-panel keypad rather than manual potentiometer trimming.
• Input voltage band, output voltage, and output voltage sensitivity are all independently configurable.

ONAN Cooling for Higher, Sustained Capacity

• Oil Natural, Air Natural (ONAN) cooling handles the thermal load across the full 3–3500 KVA range without forced-air fans, the same cooling principle used in oil-filled distribution transformers.
• Rated for Indoor or Outdoor application, versus the air-cooled range's indoor-only rating , relevant for stabilizers sited near outdoor transformer yards, DG sets, or substation infrastructure.
• IP40 degree of protection, a step up from the air-cooled unit's IP20, suited to less controlled installation environments.

Comprehensive Protection Set

• Electronic overload and short-circuit protection up to 30 KVA through the built-in MCB with manual bypass; above 30 KVA, MCB/MCCB protection is available as an option.
• Electronic over- and under-voltage trip with time delay, applied to both input and output.
• Phase reversal protection and cut-off.
• Single-phase prevention and cut-off.
• Neutral failure protection.
• Frequency cut-off protection.
• Earth neutral voltage cut-off protection.

Configurable Correction and Reset Behavior

• Correction speed adjustable from 8 to 70 V/sec (conditions apply) , a wider low-end range than the air-cooled unit's 16.6 V/sec minimum, giving finer control at the slow end for sensitive loads.
• Manual or automatic reset, with programmable time delay.
• Manual and automatic start facility, plus independent output start/stop control.
• Trip time delay adjustments with variable setting.

Metering and Status Visibility

• Digital metering (Class 1 accuracy, full scale ±1) covering input phase-to-neutral, input phase-to-phase, output phase-to-neutral, output phase-to-phase, load current across all phases, and frequency.
• Non-latching LED annunciation panel with dual-colour indication for overload latching conditions.
• Audio alarm for tripping conditions.
• LED display standard; LCD display available as an option.

Built for Indoor or Outdoor Industrial Duty

• Operating temperature range: 0°C to 45°C.
• Degree of protection: IP40.
• Cabinet finished in Siemens Grey RAL 7032, rated for indoor or outdoor installation.
• Input and output terminations include provisions for fixing cable glands.
• Conforms to IS 9815, the Indian standard for AC automatic voltage stabilizers.

Applications

• Large industrial and utility-scale loads – capacity up to 3500 KVA covers heavy machinery, large process plants, and facility-wide stabilization that exceeds what an air-cooled unit can handle.
• Outdoor or semi-outdoor installations – IP40 protection and an Indoor/Outdoor rating suit sites near outdoor transformer yards, substations, or DG set enclosures where an indoor-only stabilizer isn't practical.
• Continuous heavy-duty operation – ONAN cooling is well suited to sustained high-load operation, similar to how oil-cooled distribution transformers are chosen over dry-type units for continuous duty.
• Facilities with wide input voltage swings – three selectable input voltage range bands (295–465V, 340–480V, 360–460V) accommodate different grid stability conditions, and ranges can be customised to specific site requirements.