Abstract
Condition monitoring is a highly effective prognostic tool for incipient insulation degradation to avoid sudden failures of electrical components and to keep the power network in operation. Improved operational performance of the sensors and effective measurement techniques could enable the development of a robust monitoring system. This paper addresses two main aspects of condition monitoring: an enhanced design of an induction sensor that has the capability of measuring partial discharge (PD) signals emerging simultaneously from medium voltage cables and transformers, and an integrated monitoring system that enables the monitoring of a wider part of the cable feeder. Having described the conventional practices along with the authors’ own experiences and research on non-intrusive solutions, this paper proposes an optimum design of a Rogowski coil that can measure the PD signals from medium voltage cables, its accessories, and the distribution transformers. The proposed PD monitoring scheme is implemented using the directional sensitivity capability of Rogowski coils and a suitable sensor installation scheme that leads to the development of an integrated monitoring model for the components of a MV cable feeder. Furthermore, the paper presents forethought regarding huge amount of PD data from various sensors using a simplified and practical approach. In the perspective of today’s changing grid, the presented idea of integrated monitoring practices provide a concept towards automated condition monitoring.
Highlights
Improved maintenance technology plays a major role to keep the electrical supply network in reliable operation
The paper combines several aspects of partial discharge (PD) monitoring including the mechanism of PD activity, the selection of a compatible and optimized design of a Rogowski coil for PD measurement, the installation of the sensors and the diagnostic possibilities
The design of the coil is based on the maximization of the gain-bandwidth product because it is considered important to have the output of the sensor proportional to the input
Summary
Improved maintenance technology plays a major role to keep the electrical supply network in reliable operation. [12] presenting an integrated monitoring solution, uses only two sensors to find the location of a fault on a cable section of 300 m long among several cable sections interconnected by ring-main-units (RMUs) This methodology is a usual practice based on the two-end measurement technique and does not provide a functionality to monitor multiple sections simultaneously. This paper proposes that multiple sensors have to be installed at suitable locations with appropriate measurement techniques to identify the location of the fault in an effective way Addressing these gaps, this paper focuses on the cross-component application of the induction sensor (Rogowski coil) by proposing an optimum design that is suitable for both MV cables and transformers.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
