Modelling a Disconnect Switch
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Pablo Mourente Miguel
Abstract
This article presents a model to simulate disconnecting switches in transient studies. The distance between contacts of a disconnecting switch does not change instantaneously; it takes several seconds to complete the full movement from closed to open, or vice-versa. The disconnecting switches are able to operate with lower current amplitudes, so a disconnecting switch is operated only when the circuit breaker is in open position. However, even with the circuit breaker open, there is a current flowing through the grading capacitors. The grading capacitors in conjunction with the busbar capacitance form a capacitive divider, and there is a floating voltage in the busbar. When the contacts of the disconnecting switch move, the withstand voltage varies and an electric arc appears. This arc is unstable and is interrupted and reignited several times. Each arc reignition causes a sudden voltage change that propagates through the busbar and impacts any connected equipment.
The developed model, with the withstand voltage variation and the electric arc behaviour taken into account, calculates the fast transient overvoltages originated during a disconnecting switch operation. The amplitude and waveform of these overvoltages may then be used to evaluate the impact on insulation ageing.
References
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Artikel in diesem Heft
- Research Article
- Modelling a Disconnect Switch
- New Numerical Integration Methods for Simulation of Electromagnetic Transients
- Protection Systems and Earthing Schemes for Microgrids: Main Aspects and Fault Analysis
- Maxmize the House Roof PV Solar Output by Using Maximum Power Point Box (MPPB)
- Implementation of Single-Phase Two-Switch Midpoint Unidirectional Multilevel Converter System
- LIM Control Strategy Supported by Genetic Algorithm with Unbalanced AC Source
- Economical Feasibility of Photovoltaic Array Power Increase by Alternative Structures Inclusion
- Multi-Stage Optimal Placement of Branch PMU in Active Distribution Network
- Study on the Impacts of Uncertain Meteorological Parameters on Line Transmission Capacity
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- Smart Battery Charging Station for ElectricVehicle Using Half Bridge Power Converter
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