Voltage transient management for Alternating Current trains with vacuum circuit breakers

Alternating current power supplies and rolling stock with 25 kV (50 or 60 Hz) 15 (16.7 traction systems do not have the characteristics behaviour of a typical three-phase medium-voltage distribution system. Switching inductive loads vacuum circuit breaker (VCB) in MV poses familiar challenges as well some unique challenges, such crossing phase change neutral sections. Transformers represent highly due to their iron core and, thus, consequences energizing disconnecting transformer dealing energy stored its inductance must be considered within system context. The authors this study consider two transient phenomena associated switching single-phase, medium voltage, AC using VCB on railway stock: (i) transients that occur when transformer, particularly if lightly loaded (ii) pre-ignition inrush occurs transformer. Both can cause reliability problems, requiring increased maintenance resulting premature failures components. review use controlled other state-of-the-art methods prevent limit voltage load by means VCB. effective application techniques has been demonstrated previous research established practical applications manufacturers electrical network companies.