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Home / H.T. Automatic Voltage Regulator

H.T. Automatic Voltage Regulator – Step-less Linear Rolling Contact Type

Range : Up to 15,000 KVA in 11 & 33 KV Class

Overview

H.T. Automatic Voltage Stabilizers are designed to maintain a stable input voltage, protecting transformers and critical equipment from overloads caused by supply fluctuations. They handle wide voltage variations, ensuring that the output voltage stays within ±1% of the rated value, even under varying load conditions.
The stabilizers use advanced rolling contact technology combined with a servo mechanism and solid-state relay to continuously monitor and adjust voltage. This ensures precise, reliable voltage regulation, maintaining optimal performance and safeguarding equipment against power irregularities.

Applications

H.T. Automatic Voltage Regulators are essential in various industries that require a stable input voltage for smooth operation of electrical systems. Common sectors include:

  • Power Plants
  • Manufacturing Units
  • Chemical Plants
  • Data Centers
  • High-tech Research Facilities
  • Large-Scale Commercial Operations
These stabilizers are particularly beneficial in regions where power supply instability is a concern, ensuring that sensitive equipment operates without interruption or damage due to voltage surges or dips.

Construction Features

The H.T. Automatic Voltage Regulator boasts an efficient and robust design, built to ensure long-lasting performance in demanding environments. Key construction details include:

1. Dual-Tank Design: The stabilizer is constructed with two tanks, one housing the transformer and the other for servicing the moving parts of the rolling contacts and other internal components, ensuring easy maintenance without disturbing the main transformer.

2. Rolling Contact Mechanism: Carbon rollers are mounted on a fiber-glass carrier board and move along the helical coil track to regulate the voltage. These rollers are connected to the output terminals to maintain the desired voltage level.

3. Compensating Windings: Parallel compensating windings near the regulating coil help reduce core flux fringing, ensuring the reactance of the regulator remains constant at all times.

4. Solid-State Relay: A solid-state relay continuously monitors voltage fluctuations and triggers the motor that drives the roller mechanism, ensuring voltage adjustments within ±1%.

Specifications

  • Capacity: Up to 14,000 KVA
  • Phases: 3 Phase
  • Frequency: 50 Hz
  • Voltage Range: 11 KV / 33 KV
  • Tapping: -30% to +20%
  • Insulation: Class ‘A’
  • Vector Group: Dyn 11
  • Duty Cycle: Continuous
  • Winding: Electrolytic Grade Copper Wound
  • Terminals: As per required specifications

Standard Fittings

  • Rating & Diagram Plate: Displays unit specifications and electrical diagram.
  • Earthing Terminals: Provides safe grounding for the equipment.
  • Lifting Lugs: Facilitates easy lifting during installation.
  • Thermometer Pocket: Allows installation of a temperature monitoring thermometer.
  • Oil Conservator with Drain Plug: Maintains oil levels and enables drainage.
  • Air Release Hole with Plug: Releases trapped air for smooth operation.
  • Oil Level Indicator: Monitors and indicates transformer oil levels.
  • Explosion Vent with Diaphragm: Releases pressure to prevent damage in case of internal faults.
  • Top-Filter Valve: Filters oil to remove contaminants.
  • Inspection Cover: Provides access for maintenance and inspection.
  • Silica Gel Breather: Absorbs moisture from incoming air.
  • Drain-Cum-Bottom-Filter Valve: Drains sludge and filters contaminants from the bottom.
  • Cooling Radiators: Dissipates heat for efficient transformer cooling.
  • Uni/Bi-Directional Rollers: Ensures precise voltage regulation in both directions.

Why Choose Reliable Power Systems’ H.T. Automatic Voltage Regulator?

1. Precision Voltage Control: Ensures voltage stability within ±1% for uninterrupted equipment performance.

2. Long-Lasting Durability: Robust design with high-quality materials guarantees longevity and minimal maintenance

3. Efficient Performance: Equipped with advanced rolling contact technology for efficient and responsive voltage regulation.

4. Wide Range of Applications: Ideal for industries requiring reliable and continuous voltage regulation

  • Input Voltage: 3 Phase, AC 380V, 480V, 415V, 220V ±10%, 50-60Hz
  • Output DC Voltage: Up to 400V
  • Output DC Current: Up to 20,000 Amps
  • Protection Class: IP31 (optional: up to IP44)
  • Efficiency: ≥90% at rated output
  • Power Factor: ≥0.93 at rated output
  • Ambient Temperature: Max. 50°C (Water Cooling); Max. 40°C (Forced Air Cooling)
  • Cooling Options: Water or Forced Air Cooling
  • Regulation Range: Stepless, 0-100%
  • Control Precision: Voltage/Current < 0.5%
  • Duty Ratio: Continuous operation at rated loads, up to 2000m altitude
  • Control Mode: Constant Current/Voltage/Power (AHM)
  • Operation Mode: Local/Remote
  • Relative Humidity: 15%-85% RH
  • Interface: RS485, RS232, MODBUS TCP, Profibus-DP, Profinet, Analog (0-10V,
    4-20mA)
  • Parallel Connection: No Limit
  • HMI Options: Touch Panel or Digital Meters/Buttons