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A case study on Capacitive Voltage Transformer (CVT) behaviour on multiple earthing of CVT secondary circuit in a 400 kV Transmission line. by Yogeshwar Singh Rana; Vibhay Kumar; Sushil Sharma; Naresh Kumar is a scholarly article available to read on EtoBox.

What is A case study on Capacitive Voltage Transformer (CVT) behaviour on multiple earthing of CVT secondary circuit in a 400 kV Transmission line. about?

The neutral point of secondary circuits of Instrument transformers e.g., Capacitive Voltage Transformer and Current Transformer (CVT & CT) must be earthed, IEEE emphasises that the secondary of instrument transformer must be grounded to protect the connected equipment and to ensure safety of working personnel. It recommends grounding of all in-service secondary circuits at the first point of its application (for CVT, typically a relay or meter) to counter the rise in electrostatic potential in secondary circuit due to stray capacitance. On the contrary, if the secondary neutral point of CVT has multiple earthing, the output voltage is not a replication of primary voltage during fault. This leads to mal-operation or non-operation of protection relays. As no discrepancy in secondary voltages is sensed by relays during normal operation, hence multiple earthing remains unnoticed and thereby compromising the integrity of relay operation. In this case study the behaviour of CVT having multiple neutral earthing has been illustrated, based on the site experience along with disturbance records and relay data. This paper, based on field data and vectorial mathematical analytics establishes t

Author

Yogeshwar Singh Rana; Vibhay Kumar; Sushil Sharma; Naresh Kumar

Publisher

ACM

Published

2021

Language

EN