<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>A low impedance fault on a transmission line causes large fault currents that can lead current transformers in the switchyard that supplies the fault to saturation. If the fast automatic reclosing is implemented the current transformers additionally enter saturation. After the definitive trip, the residual magnetic energy in the current transformers is discharged via secondary circuits. The measuring inputs of the protective devices are connected to the secondary of the current transformers, and if the current is large and lasts long enough consequence can be an unwanted operation of the protective device. This paper gives an example of an unwanted operation of circuit breaker failure protection, which is a function within distributed busbar protection, as a consequence of such an event.</p>
</abstract>

A low impedance fault on a transmission line causes large fault currents that can lead current transformers in the switchyard that supplies the fault to saturation. If the fast automatic reclosing is implemented the current transformers additionally enter saturation. After the definitive trip, the residual magnetic energy in the current transformers is discharged via secondary circuits. The measuring inputs of the protective devices are connected to the secondary of the current transformers, and if the current is large and lasts long enough consequence can be an unwanted operation of the protective device. This paper gives an example of an unwanted operation of circuit breaker failure protection, which is a function within distributed busbar protection, as a consequence of such an event.

Influence of Current Transformer Saturation on Numerical Protection Relays – A Case Study of Circuit Breaker Failure Protection

B&H Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

A low impedance fault on a transmission line causes large fault currents that can lead current transformers in the switchyard that supplies the fault to...

Influence of Current Transformer Saturation on Numerical Protection Relays – A Case Study of Circuit Breaker Failure Protection

Published Online: Oct 26, 2022

Page range: 78 - 85

Received: Sep 01, 2021

Accepted: Oct 01, 2021

DOI: https://doi.org/10.2478/bhee-2021-0021

Keywords
numerical protection, distance protection, automatic reclosing, distributed busbar protection, breaker failure protection, current transformer saturation

© 2021 Sead Arnautalić et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Influence of Current Transformer Saturation on Numerical Protection Relays – A Case Study of Circuit Breaker Failure Protection

Published Online: Oct 26, 2022

Page range: 78 - 85

Received: Sep 01, 2021

Accepted: Oct 01, 2021

DOI: https://doi.org/10.2478/bhee-2021-0021

Keywordsnumerical protection, distance protection, automatic reclosing, distributed busbar protection, breaker failure protection, current transformer saturation

© 2021 Sead Arnautalić et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
numerical protection, distance protection, automatic reclosing, distributed busbar protection, breaker failure protection, current transformer saturation