Because of its low secondary impedance, a Potential Transformer’s (PT) secondary can be shorted, resulting in a dangerously high current.
This high current can induce overheating, winding insulation burnout, and core saturation, resulting in voltage distortions.
Such conditions carry significant dangers, including
- Equipment damage,
- Fire threats, and
- Possibly complete pt failure.
Safe Practices:
Always connect the PT secondary to a high impedance load, such as a voltmeter or a protection relay.
Install fuses (or) MCBs to protect the circuit.
To avoid accidents, never short PT secondary cables during maintenance or testing.
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