Amrest Electricals Ltd. is a trusted name in the electrical power industry, renowned for manufacturing, exporting, and supplying high-precision Voltage Transformers (VTs) across India and international markets. Our transformers are specially designed for metering and protection in high-voltage and medium-voltage systems, ensuring safety, accuracy, and durability in critical power infrastructure.
Our Product Range
🔹 Indoor Dry-Type Resin Cast Voltage Transformers
🔹 Outdoor Oil-Cooled Voltage Transformers
🔹 Single Phase and Three Phase Designs Available
🔹 Three Phase Residual Voltage Transformers (RPT / RVT)
Indoor Dry-Type Resin Cast Voltage Transformers
Amrest Electricals Ltd. offers a premium range of Indoor Dry-Type Resin Cast Voltage Transformers (VTs) designed for accurate voltage measurement and reliable protection in medium and high-voltage systems. These transformers are encapsulated in high-quality epoxy resin, providing excellent dielectric strength, moisture resistance, and mechanical durability — ideal for indoor installations such as switchgear panels and control rooms.
Key Features:
- Type: Single Phase / Three Phase
- Voltage Class: Up to 33 kV
- Insulation: Epoxy Resin Encapsulated (Non-hygroscopic)
- Cooling: Naturally Air-Cooled (Dry Type)
- Secondary Voltage: 110 V or 110/√3 V
- Rated Burden: 10 VA to 500 VA at 0.8 PF lagging
- Frequency: 50/60 Hz
- Accuracy Class:
- Metering: 0.1, 0.2, 0.5, 1.0, 3
- Protection: 3P, 6P
Outdoor Oil-Cooled Voltage Transformers
Amrest Electricals Ltd. manufactures high-quality Outdoor Oil-Cooled Voltage Transformers (VTs) designed to deliver accurate voltage measurement and system protection in outdoor high-voltage power networks. Built for durability and performance, these transformers are oil-immersed and housed in robust weatherproof enclosures, ensuring stable operation in harsh environmental conditions.
Key Features:
- Type: Single Phase / Three Phase
- Voltage Class: Up to 220 kV
- Insulation Medium: Mineral Oil (Conforming to IS 335 / IEC 60296)
- Secondary Voltage: 110 V or 110/√3 V
- Rated Burden: 10 VA to 500 VA at 0.8 PF lagging
- Cooling Type: Oil Natural Air Natural (ONAN)
- Accuracy Class:
- Metering: 0.1, 0.2, 0.5, 1.0, 3
- Protection: 3P, 6P
- Frequency: 50/60 Hz
- Construction: Hermetically sealed or conservator type as per customer requirement
- Standards Compliance: IS 3156, IEC 60044-2, ANSI C57
Applications
- Revenue metering in substations
- Protection of power system equipment
- Voltage monitoring and indication
- Detection of residual voltage in unearthed and grounded networks
Technical Specifications
- Standard Secondary Voltage: 110 V or 110/√3 V
- Rated Burden: 10 VA to 500 VA at 0.8 lagging power factor
- Frequency: 50/60 Hz
- Insulation Class: A, B, or F
- Cooling:
- Dry Type – Resin Cast (Indoor)
- Oil-Immersed (Outdoor)
Accuracy Classes
🔸 For Metering Voltage Transformers:
 • 0.1 • 0.2 • 0.5 • 1.0 • 3.0
🔸 For Protective Voltage Transformers:
• 3PR • 6PR
🔸 For Residual Voltage Transformers (RPT/RVT):
 • 5PR • 6PR
Voltage Factor Options
We offer a range of standard and custom voltage factors including:
- 1.2 Continuous
- 1.5 for 30 Seconds
- 1.9 for 30 Seconds
(Specified as per system application and protection requirements)
Why Choose Amrest Voltage Transformers?
✅ High Measurement Accuracy
✅ Robust Design for Harsh Environments
✅ Reliable Electrical Insulation and Dielectric Strength
✅ Low Maintenance, Long Life
✅ Fully Compliant with IS 3156, IEC 60044-2, and ANSI Standards
✅ Customizable Solutions Available
We are Manufacturer, exporter and Supplier of Voltage Transformer, Potential Transformer for India, United Arab Emirates , Dubai , Sharjah , Saudi Arabia , Bahrain , Iraq , Kuwait , Oman , Qatar, Afghanistan, South Africa , Zambia , Tanzania , Ghana , Nepal , Bhutan , Bangladesh, Indonesia, Kenya , Malaysia, Turkey, Zimbabwe and other countries.