INDUSTRIES > POWER EQuIPMENT > Voltage Transformers > 36 kV Voltage Transformers
Indoor & Outdoor Voltage Transformers for Metering and Distribution
Indoor Precision, Outdoor Resilience
Our 36 kV VT series covers a range of indoor and outdoor applications, including:
Single-pole resin-cast VTs combinable into three-phase VT and Grounding Potential Transformer sets
Metal-clad shielding variants for electromagnetic protection
MOF (Metering Outfit) Billing VTs with exceptional UV resistance and resilience
Units can be manufactured to IEC, IEEE, and other international standards, with customization, outdoor variants, and ODM/OEM services available on request.
All units are type-tested and routine-tested through a TAF-accredited (ILAC member) laboratory. We offer a wide range of specifications alongside customization and ODM/OEM services, making these CTs a proven choice for utilities, factories, and major infrastructure projects worldwide.
Single-Pole Voltage Transformers, or Three-Phase VT (PT) + GVT (GPT)
EPF-10CE, EPF-20SK, EPF-20SL, EPF-20SNE, EPF-20DZE, EPF-30DE
Single-pole voltage transformers in this indoor medium-voltage range are epoxy-resin-cast units designed for 12 kV, 24 kV, and 36 kV power systems. Also referred to as potential transformers (PTs), these instrument transformers are molded in Araldite® epoxy resin and are self-extinguishing, providing reliable insulation performance and moisture resistance in switchgear applications. They operate with measuring and monitoring instruments for power system analysis and supervision or in conjunction with protective relays to support system safety and operational reliability.
- Standard: IEC or IEEE
- Application: Indoors
- Construction: Single-pole; cast in Araldite® epoxy resin; self-extinguishing
- System Voltage: 12 kV, 24 kV, and 36 kV
- Frequency: 50 or 60 Hz
- Models EPF-20SL, EPF-20SNE, and EPF-20DZE are available with single-voltage or dual-voltage primary ratings.
- EPF-20SL and EPF-30DE only: (Option) Elbow-type connector and tubular epoxy housing with a built-in primary fuse
- GVT (GPT) Functionality: Connect three voltage transformers (potential transformers) from this series through a Y-Y-open △ connection for the combined functionality of a three-phase VT (PT) and a grounding voltage transformer (grounding potential transformer) (i.e. 3Φ VT + GVT, or 3Φ PT + GPT).
For models EPF-20SL and EPF-20SNE, optional primary-side accessories include an elbow-type connector and a tubular epoxy housing with a built-in primary fuse. This configuration enhances operational safety, simplifies maintenance, and supports more compact switchgear panel design.
Certain models offer a rated thermal burden of 1000 VA or higher, enabling them to function not only as voltage transformers but also as a power source for circuit breaker operation in medium-voltage switchgear systems.
a M = Voltage ratio of the measuring winding.
b R = Residual voltage ratio of the residual voltage winding, as defined in IEC 61869-3:2011, Clause 3.1.308, intended for broken-delta (open-delta) connection of a set of three single-phase voltage transformers.
c Applicable only to configurations with a primary voltage of 22/√3 kV.
d Values according to Standard Values of Rated Voltage Factors by IEC 61869-3: 2011.
Outdoor-Type Voltage Transformers for Revenue Metering
VPF Series
Outdoor voltage transformers in the VPF Series are medium-voltage potential transformers designed to be part of a MOF (Metering Outfit) for revenue metering. Insulated with Araldite® UV-resistant cycloaliphatic epoxy resin, these 15.5–36.5 kV outdoor instrument transformers can withstand long-term exposure to solar ultraviolet radiation, salt fog, high temperature, high humidity, as well as other harsh environmental conditions.
- Standard: IEC or IEEE*
- Application: Outdoors; MOF (Metering Outfit) for revenue metering
- Construction:Insulated with UV-resistant cycloaliphatic epoxy resin
- Maximum System Voltage: 15.5 ~ 36.5 kV
- Frequency: 50 or 60 Hz
36 kV Epoxy-Cast Voltage Transformers
EPF-30SA, EPF-30SB
The EPF-30SA and EPF-30SB indoor-use voltage transformers (potential transformers), designed for a 36kV (max.) power system and insulated with Araldite® epoxy resin, have a high insulation level and superior moisture resistance. In addition, they have passed type testing and environmental testing according to IEC standards and can perform under the temperature condition of -45℃～+65℃.
The EPF-30SA and EPF-30SB medium-voltage voltage transformers (potential transformers) have been a preferred choice of major corporations of numerous countries.
- Standard: IEC or IEEE*
- Application: Indoors; suited to salty or polluted air, high humidity and high temperature
- Construction: Insulated with Araldite® epoxy resin
- System Voltage: ≦ 36 kV
- Frequency: 50 or 60 Hz
- Ambient Temperature: -45~+65°C
- Approximate Weight: 65 kg
36 kV Metal-Clad Voltage Transformer for Indoor Applications
EPF-30SE
Designed for the switchgear panels of a 36 kV (max.) power system, this single-pole indoor-use voltage transformer (potential transformer) is cast in Araldite® epoxy resin and covered with an aluminum box. The grounded aluminum box for shielding reduces the necessary distance between the voltage transformer and the panels (or other equipment). This epoxy-cast voltage transformer is characterized by excellent moisture resistance, superior electrical performance, and great reliability.
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