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
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【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.
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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.
