Long Duration Overvoltages due to Current Backfeeding in Secondary Networks
- Resource Type
- Periodical
- Authors
- Salcedo, R.; Ran, X.; de Leon, F.; Czarkowski, D.; Spitsa, V.
- Source
- IEEE Transactions on Power Delivery IEEE Trans. Power Delivery Power Delivery, IEEE Transactions on. 28(4):2500-2508 Oct, 2013
- Subject
- Power, Energy and Industry Applications
Circuit faults
Metropolitan area networks
Surge protection
Power system transients
Fault location
Transient analysis
Substations
Time-domain analysis
overvoltages
power system transients
time-domain analysis
- Language
- ISSN
- 0885-8977
1937-4208
This paper analyzes long duration overvoltages due to backfeeding currents from the low-voltage network to the medium-voltage network through network protectors in heavily meshed underground distribution networks. Overvoltages above 3 p.u. may be developed as a result of a simultaneous occurrence of three phenomena: neutral displacement, Ferranti effect, and current chopping. A detailed model of a typical distribution network is utilized for the study. Time-domain simulations are performed using an Electromagnetic Transients Program-type program. The results demonstrate that overvoltages due to backfeeding last longer during peak load operating conditions, and the largest peak overvoltages occur at no load.