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.
About the Product
The EGP-3(6)DF Series voltage transformers, designed for indoor applications, are three-phase “grounding potential transformers” (GPT), or “grounding voltage transformers” (GVT). On the primary side, each phase of the voltage transformer, or potential transformer, comes with a fuse to protect against overload and short circuit currents. This type of voltage transformer features coils insulated with Araldite® epoxy resin, as well as a five-legged laminated core. The primary rated voltage is 3300V (Y connection) or 6600V (Y connection). When the VT, or PT, is used in conjunction with measuring or monitoring instruments, the secondary rated voltage is 110V (Y connection).
This voltage transformer can also be used as a grounding voltage transformer for ground-fault protection. When any one phase of the primary side is grounded in an abnormal or accidental situation, the tertiary rated voltage is 0~190V (open-delta connection) or 0~110V (open-delta connection). The tertiary side produces and transmits a ground fault voltage signal to a monitoring device or ground relay, by which the VT (PT) achieves its monitoring purpose and the protection of equipment or individuals.
Specifications*
Standard | IEC or IEEE | |
Frequency | 50 or 60 Hz | |
| System Voltage | Model: EGP-3DF | ≦ 3.6 kV |
Model: EGP-6DF | ≦ 7.2 kV | |
Connection | Y-Y-open△ | |
| Primary Fuses | 3 | |
Selection Table*
Model | Phase | Primary | Secondary Rated Voltage (V) | Tertiary | Burden / Accuracy | AC/BIL | Approx. |
EGP-3DF | 3 | 3300 | 110 | 190 (open△) or 110 (open△) | 3X200VA / 1.0CL + 3X200VA / 3P | 10/40 | 57 |
EGP-6DF | 3 | 6600 | 110 | 190 (open△) or 110 (open△) | 3X200VA / 1.0CL + 3X200VA / 3P | 20/60 | 57 |
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【Product Brochure】Grounding Voltage Transformers, EGP-3(6)DF Series
Easy-to-print document, containing product description, specifications, and a selection table.
【Product Dimensions】Grounding Voltage Transformers, EGP-3(6)DF Series
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.
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