Voltage Transformer or Potential Transformer
Voltage Transformers (VTS) - Importance
Voltage transformers are the next important component of Protection.
Voltage Transformers:
- are used for measuring and protection
- may be single phase or three phase
- provide isolation from high voltages
- must operate in the linear region to prevent accuracy problems
- must be capable of driving the burden, specified by relay manufacturer
Types of Voltage Transformers (VTS)
There are two basic types of VTs-Electromechanical VTs and Capacitor VTS.
Electromechanical VTs
- Are similar to a power transformer
- May not be economical above 132kV
- Robust and more reliable
Capacitor VTs
- Used at high voltages (132 Kv or above)
- Main difference is that CVT has a capacitor divider on the front end
- Require maintenance as capacitor is used
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