Medium-Voltage Potential Transformer | Elevate Power Distribution: Explore Premium Voltage Transformers | CIC

12/24 kV Epoxy-Cast Voltage Transformer (Potential Transformer), Power Source for Circuit Breaker Operation and Lighting (Model: EPF-20DZ) / 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.

Featured Products

12 kV & 24 kV Epoxy-Cast Voltage Transformer (Potential Transformer) or Control Power Transformer, as Power Source for Circuit Breaker Operation and Lighting | 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 12 kV & 24 kV Epoxy-Cast Voltage Transformer (Potential Transformer) or Control Power Transformer, as Power Source for Circuit Breaker Operation and Lighting, 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.

12/24 kV Epoxy-Cast Voltage Transformer (Potential Transformer), Power Source for Circuit Breaker Operation and Lighting (Model: EPF-20DZ)
Send Inquiry

12 kV & 24 kV Epoxy-Cast Voltage Transformer (Potential Transformer) or Control Power Transformer, as Power Source for Circuit Breaker Operation and Lighting

EPF-20DZ

This voltage transformer, cast with self-extinguishing epoxy resin, is a medium-voltage, indoor-type, single-phase potential transformer for a 12kV or 24kV power system for measuring and monitoring voltage signals. With a continuous output capacity of 4000 VA (max.), it can also serve in a small substation or a switchgear panel as a power source for circuit breaker operation and lighting equipment*.

* Power source for circuit breaker operation and lighting equipment: In this application, the voltage transformer can also be referred to as a "control power transformer" (CPT), "control transformer" (CTR), "industrial control transformer," or a "machine tool transformer."

Medium-Voltage Potential Transformer

About the Product

Single-phase indoor-use voltage transformer (potential transformer) EPF-20DZ, intended for a 12 or 24 kV power system, is designed for the measuring and monitoring of the voltage signal.

Due to its continuous output capacity of 4000VA (max.), this voltage transformer can be used in a small substation or a switchgear panel as a power source for circuit breaker operation and lighting equipment. This setup helps to conserve space and reduce cost.

In addition, the EPF-20DZ voltage transformer can be connected to one or two smaller-capacity voltage transformers to form a three-phase voltage transformer (3ϕ VT). This can be done via a V-V or Y-Y connection.

Cast in self-extinguishing Araldite® epoxy resin, the EPF-20DZ voltage transformer is characterized by superior insulation and excellent safety.

Product Features

  • Standard: IEC or IEEE*
  • System Voltage: 12 or 24 kV
  • Frequency: 50 or 60 Hz
  • Power source for circuit breaker operation and lighting
  • Option: Forming a three-phase VT (PT) through connection with one or two smaller-capacity voltage transformers (via a V-V or Y-Y connection)
  • No risk of oil leakage
  • Self-extinguishing
  • Includes a fuse on the secondary side

Selection Table

Model

Primary
Voltage
(kV)		Secondary Voltage
(V)

Burden / Accuracy

AC / BIL
(kV)

Thermal Burden
(VA)

Creepage
(mm)

EPF-20DZ

22 or 11

110

500VA/0.5CL
200VA/0.3CL

50/125

4000

531

22

220-110**

4000-2000

* Other standards and specifications available. 
** This specification comes with an added tap in the secondary winding so as to offer two voltage ratios (22-11 kV).

Download Documents
Related Products
  • Single-Pole Voltage Transformers (Potential Transformers), or Three-Phase VT (PT) + GVT (GPT)
    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."

  • 12 kV & 24 kV Epoxy-Cast Voltage Transformers (Potential Transformers) for Indoor Use
    12 kV & 24 kV Epoxy-Cast Voltage Transformers (Potential Transformers) for Indoor Use
    EPF-10B/20SE/20SI

    Widely used for 12~24 kV power systems and insulated with Araldite® epoxy resin, these voltage transformers, or potential transformers, are characterized by superior moisture resistance and excellent electrical properties. Customizable for different standards and requirements.

  • Conductive Shield Voltage Transformer (Potential Transformer) for 24 kV 4-Way Switchgear (Also Operation Power Source)
    Conductive Shield Voltage Transformer (Potential Transformer) for 24 kV 4-Way Switchgear (Also Operation Power Source)
    EPF-20FB

    This voltage transformer is a single-phase, epoxy-resin-cast medium-voltage potential transformer designed to also function as an operation power source*, specifically paired with 24kV 4-Way Switchgear. It features a high-voltage elbow-type connector on the primary side and includes an internal high-voltage power fuse for protection. The exterior of the voltage transformer is coated with a conductive metal mixture for shielding, and waterproof treatment can be requested for the secondary side. The voltage transformer has a rated burden and accuracy of 600 VA / 3.0 CL.* Operation power source: In this application, the voltage transformer can also be referred to as a "control power transformer" (CPT), "control transformer" (CTR), "industrial control transformer," or a "machine tool transformer."

  • Voltage Transformers (Potential Transformers) as Circuit Breaker Operation Power Source
    Voltage Transformers (Potential Transformers) as Circuit Breaker Operation Power Source
    EPF-3SF1, EPF-6SF2

    Voltage transformers EPF-3SF1 and EPF-6SF2 are medium-voltage, indoor-type potential transformers cast in epoxy resin, commonly installed on switchgear (3.3kV or 6.6kV) to serve as an auxiliary power source* for circuit breaker operation. Positioned atop the switch as an operational power source, these transformers can handle relatively high outputs for short durations. Featuring Class-F heat-resistant insulation material for the coils, each voltage transformer is equipped with two power fuses on the primary side to safeguard against overload and short-circuit currents.* Auxiliary power source: In this application, the voltage transformer may also be referred to as a "control power transformer" (CPT), "control transformer" (CTR), "industrial control transformer," or a "machine tool transformer."

  • Coil Molded Single-Phase Voltage Transformers (Potential Transformers), Indoor Use
    Coil Molded Single-Phase Voltage Transformers (Potential Transformers), Indoor Use
    EP-3SF/6SF Series

    Voltage transformers of the EP-3SF/6SF Series are coil-molded, single-phase, indoor-type, medium-voltage, epoxy-resin-insulated potential transformers suitable for power systems of 7.2kV or below. Made with either a laminated core (Model EP-3SF2) or a cut core (EP-3SF5 & EP-6SFK), the voltage transformer has two power fuses attached to the primary side. Specific models from this series can be used as an auxiliary power source for circuit breaker operation — that is, as a control power transformer (CPT), also referred to as a control transformer (CTR), industrial control transformer, or machine tool transformer.

  • Indoor Low-Voltage Single-Phase Voltage Transformers (Potential Transformers)
    Indoor Low-Voltage Single-Phase Voltage Transformers (Potential Transformers)
    S-N Series

    Single-phase voltage transformers, or potential transformers, for indoor locations of lower humidity. Class-A insulation material. Used with measuring or monitoring instruments, or as an auxiliary power source in the main panel or motor control panel. In the latter usage, this product can be referred to as a "control power transformer" (CPT), "control transformer" (CTR), "industrial control transformer," or a "machine tool transformer."