Vacuum circuit breaker modelling for the assessment of transient recovery voltages: Application to various network configurations

• Published in: Electric power systems research 2018-03, Vol.156, p.35-43
• Main Authors: Bak, C.L., Borghetti, A., Glasdam, J., Hjerrild, J., Napolitano, F., Nucci, C.A., Paolone, M.
• Format: Article
• Language: English
• Subjects: Cable inrush currents; Circuit breakers; Circuits; Computer simulation; Electric cables; Electric currents; EMTP simulations; Insulation; Modelling; Motor inrush currents; Offshore energy sources; Parameter identification; Recovery; Simulation; Surge protectors; Switching; Transient recovery voltages; Vacuum circuit breakers; Vacuum technology; Wind farms; Wind power
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/j.epsr.2017.11.010

•The use of vacuum circuit breaker models for transient recovery voltages simulation is presented.•The models are validated against measurements in a water-pumping plant and in an offshore wind farm.•Detailed vacuum circuit breaker models significantly improve the agreement between measurement and simulation results.•The adjustment of the VCB model parameters is necessary to fit the simulations for both opening and closing manoeuvres. Vacuum circuit breakers (VCBs) are widely used for medium voltage applications when low maintenance, long operating life, and large number of allowable switching cycles are required. The accurate estimation of the transient recovery voltages (TRVs) associated with their switching operation is indispensable for both VCB sizing and insulation coordination studies of the components nearby the switching device. In this respect, their accurate modelling, which is the object of the paper, becomes crucial. In particular, the paper illustrates two applications of a VCB model, which show the model capabilities of simulating TRVs due to opening/closing operation, namely the switching of large electrical motors and the switching of cables collecting offshore wind farms (OWFs). Data from digital fault recorder (DFR) in a water-pumping plant and from a measurement campaign in an OWF using a high-bandwidth GPS-synchronised measurement system, respectively, are used for model validation. It is shown that the inclusion of detailed VCB models significantly improves the agreement between the measurements related to both pre- and restrikes and the corresponding simulation results obtained by using two well-known electromagnetic transient simulation environments, namely, EMTP-RV and PSCAD/EMTDC. The procedure adopted for the identification of the VCB model parameters is described.