Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 37, Issue 3, Pages 2153-2162Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2021.3104906
Keywords
Voltage measurement; Capacitors; Monitoring; Voltage transformers; Substations; Phase measurement; Energy measurement; Algorithms; asset management; capacitor voltage transformer CCVT; CVT; health; monitoring; puncture; unbalance
Categories
Funding
- Swedish National Grid (Svenska kraftnat) [TPWRD-00159-2021]
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This article introduces a data-driven method for monitoring CVT capacitor punctures. This method improves transmission system stability, prevents equipment damage, reduces personnel risk, and corrects errors in energy measurement systems. The Swedish National Grid has successfully detected old punctures and expects to prevent future capacitor punctures using this method.
In 2014 a number of Capacitor Voltage Transformers (CVTs) exploded in the Swedish transmission grid. To address this problem, data driven methods for continuously monitoring CVTs were developed. Thanks to these methods, CVT capacitor punctures are now regularly noticed and addressed before causing serious damage. This paper describes the algorithms used to make this possible. Detecting all CVT capacitor punctures as they occur increases the transmission system stability, avoids equipment damage, lowers risks to personnel when visiting the substations and makes it possible to correct measurement errors in the energy measurement systems. Automatic supervision scripts, using energy meter data, are running continuously and will alert the service personal immediately when problems occur. With the algorithms proposed in this article, the Swedish National Grid (Svk) has detected many old punctures and expects no future capacitor punctures to go undetected. Detecting all new punctures enables Svk to save substantial future cost since planned actions now are possible.
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