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Reliability and Cost-Effectiveness Analysis of Various HV Substation Configurations
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering. (QED-AM)ORCID iD: 0000-0002-2462-8340
2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Reliable power supply is one of the crucial factors for the development of any industry. Different technologies as well as configurations are available when it comes to investing in new electrical assets. According to [1], the circuit configurations of high voltage substations are strongly influenced by many factors, such as operational requirements, security standards, availability, maintainability, etc. There is always a trade-off between the technical requirements and the cost of investment. This paper aims to quantify the availability of a switchyard with two lines and two transformer bays for various switching configurations. Once the overall availability is determined, the decision for the selection of a switching configuration is made based on the cost-benefit analysis.

The voltage rating of a primary substation is decided based on the scale of an industry. Switching configuration is one of the major factors affecting the overall availability of the substation. Each switching configuration has its own pros and cons in terms of its operation, reliability and investment cost. It is impossible to achieve 100% availability of a substation with any kind of switching scheme. Availability and investment cost of a substation vary with the choice of the configuration and substation technology. There are mainly three available technologies - Air Insulated Switchgear (AIS), Gas Insulated Switchgear (GIS) and Mixed Technology Switchgear (MTS).

This paper evaluates possible choices for an example of supply which is very often seen in practice, providing guidelines for decision-making process in order to optimize profit of an industry, from the supply-reliability point of view. In this paper, a 220/66kV AIS substation for an upcoming process plant is under consideration. The scope of this paper is limited to assess the availability of primary side of the substation. There are two-line bays and two transformer bays in the 220kV switchyard. Down-stream to the 66kV side is not taken into consideration for the analysis purpose.

Place, publisher, year, edition, pages
Montreal, 2019. article id CIGRE-152
Keywords [en]
substation layout, reliability, availability, circuit breakers, disconnectors
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-265540OAI: oai:DiVA.org:kth-265540DiVA, id: diva2:1377925
Conference
14e congrès annuel de CIGRE Canada 14th annual congress of Cigre Canada, September 16-19, 2019
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, FPS7
Note

QC 20191213

Available from: 2019-12-13 Created: 2019-12-13 Last updated: 2019-12-13Bibliographically approved

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