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).
* Model marked with an asterisk can be used as a circuit breaker operation power source due to its rated thermal burden of 1000VA (max.).
** Values according to Standard Values of Rated Voltage Factors by IEC 61869-3: 2011.
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
- Download Documents
CIC Company Profile
Learn about our company: history, strengths, products, global locations, and our Advanced Electricity Lab.
【Product Brochure】Single-Pole Voltage Transformers, or Three-Phase VT + GVT
Easy-to-print document, containing product description, features, and a selection table.
【Product Dimensions】Single-Pole Voltage Transformers, or Three-Phase VT + GVT
Download PDF for basic drawing(s) and dimensions of this product. For more detailed information, please contact CIC.
-
CT & PT Selection Guide: How to Choose a Current Transformer or Potential Transformer
How to select, based on application and power system attributes, the primary and secondary currents, burden, accuracy, rated frequency, type (indoor vs. outdoor), insulation material, etc.
- Related Products
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."
Three-Phase Grounding Voltage Transformer (GVT), or Grounding Potential Transformer (GPT), for MV Indoor Applications
EGP-3DF, EGP-6DF
This ground voltage transformer (GVT), or ground potential transformer (GPT), is a three-phase medium-voltage (MV) potential transformer for indoor applications. With a fuse for each phase, this PT (VT) features epoxy-insulated coils and a five-legged (five-limbed) laminated core. This voltage transformer is used with measuring or monitoring instruments, or for ground-fault protection.
36 kV Metal-Clad Voltage Transformer (Potential Transformer) for Indoor Application
EPF-30SE
Intended for the switchgear panels of a 36 kV power system, this single-pole epoxy-cast voltage transformer (potential transformer) for indoor application is covered with an aluminum box. The grounded aluminum box for shielding reduces the installation space requirement.
- Related News
08Oct 2024 Focus on Smart Energy: CIC Showcases Power Solutions at Successful Exhibition
Challenge Industrial Co., Ltd. (CIC) successfully showcased a range of power solutions at the “Energy Taiwan 2024” held from October 4 to 6 this year. The well-prepared exhibits included not only a variety of current transformers (CTs), voltage transformers (VTs), bushing current transformers (BCTs), and surge protection devices (SPDs) but also featured the most sought-after Smart Electronic Meters and Energy Management Systems (EMS).
Read More04Sep 2024 CIC Joins Energy Taiwan 2024 to Highlight Smart & Sustainable Energy Solutions
CIC is excited to join Energy Taiwan 2024 at the Taipei Nangang Exhibition Center, Hall 2.
Read More
