MV Indoor Epoxy-Cast Potential Transformers | Elevate Power Distribution: Explore Premium Voltage Transformers | CIC

Single-Pole Voltage Transformers (Potential Transformers), or Three-Phase VT (PT) + GVT (GPT) / Serving a diverse client base around the world, CIC is a leading manufacturer and supplier of current transformers, potential transformers (voltage transformers), distribution transformers, epoxy insulators, electronic meters, and other electrical and electronic products.

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Single-Pole Voltage Transformers (Potential Transformers), or Three-Phase VT (PT) + GVT (GPT) | Enhance Safety and Performance with Superior Epoxy Insulators | CIC

Based in Taiwan since 1974, CHALLENGE INDUSTRIAL CO., LTD. specializes in manufacturing high-quality electrical products, including Single-Pole Voltage Transformers (Potential Transformers), or Three-Phase VT (PT) + GVT (GPT), current transformers, voltage transformers, distribution transformers, epoxy insulators, and power capacitors. With over 45 years of expertise and technology collaboration with Germany's MWB, CIC is ISO certified and offers products recognized for reliability in various industrial applications.

Challenge Industrial Co., Ltd. (CIC) stands at the forefront of electrical innovation, specializing in the manufacturing of current transformers, voltage transformers, distribution transformers, epoxy insulators, and power capacitors. With a legacy built on over 45 years of engineering excellence and leveraging advanced German technology, CIC commits to delivering high-quality, ISO-certified electrical solutions. Their comprehensive product range, paired with an ISO-certified approach and a TAF-accredited laboratory, ensures reliability and performance for a diverse global market. CIC is your go-to source for electrical components that power progress and efficiency.

CIC has been offering customers high-capacity power capacitors since 1974, both with advanced technology and 50 years of experiences, CIC ensures each customer's demands are met.


Single-Pole Voltage Transformers (Potential Transformers), or Three-Phase VT (PT) + GVT (GPT)

EPF-10CE, EPF-10DE, EPF-20SK, EPF-20SL, EPF-30DE

Voltage transformers from this series are indoor medium-voltage single-phase epoxy-resin-cast potential transformers suitable for 12kV, 24kV, and 36kV power systems. They are used in conjunction with measuring instruments for system monitoring and analysis or in combination with protective relays. Specific models can be equipped with a combination fuse assembly on the primary side. Additionally, models with a maximum thermal burden of 1000 VA can also function as a power source for circuit breaker operation, meaning they can serve as "control power transformers" or "control transformers," also known as CPT or CTR, or "industrial control transformers" or "machine tool transformers."

MV Indoor Epoxy-Cast Potential Transformers

About the Product

Cast in Araldite® epoxy resin and designed for 12/24/36 kV power systems, these single-pole voltage transformers, or potential transformers, are self-extinguishing and are characterized by their superior insulation and excellent moisture resistance. These VTs (PTs) can be used with measuring or monitoring instruments for power system analysis and monitoring; alternatively, they can be paired with protective relays to maintain system safety during power supply.

For models EPF-20SL and EPF-30DE, optional accessories are offered, which include an elbow-type connector (for the primary side) and a tubular epoxy housing, which contains a built-in primary fuse. The tubular epoxy housing may be attached to the VT (PT) through the elbow-type connector. This option helps to enhance safety of operation, allow easier repair, and reduce the size of the switchgear panel.

Model EPF-20SL provides a rated thermal burden of 1000VA (maximum) and can be used as a power source for circuit breaker operation.

Product Features and Selection Tables
  • Indoor usage; cast in Araldite® epoxy resin for superior insulation
  • Standard: IEC or IEEE*
  • Frequency: 50 or 60 Hz
  • 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).

Single-Pole Potential Transformers (or Three-Phase PT + GPT) - Selection Table

* Model marked with an asterisk can be used as a circuit breaker operation power source due to its rated thermal burden of 1000VA (max.).


Single-Pole Potential Transformers (or Three-Phase PT + GPT) - Rated Voltage Factor Table

** Values according to Standard Values of Rated Voltage Factors by IEC 61869-3: 2011.


Single-Pole Potential Transformers (or Three-Phase PT + GPT)

Note: Other standards and specifications available.

Available Models

EPF-10CE, EPF-10DE, EPF-20SK, EPF-20SL, EPF-20SL with Fuse, EPF-30DE, EPF-30DE with Fuse




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