The conventional time function of electromechanical relays is hard to coordinate with other relays. In order to promote the application of inverse-time overcurrent relays, a new time function for microprocessor-type r...The conventional time function of electromechanical relays is hard to coordinate with other relays. In order to promote the application of inverse-time overcurrent relays, a new time function for microprocessor-type relay is proposed. The setting of the trip time for this relay is performed by determining the shortest trip time and the longest trip time, respectively. The results of analysis show that with the new time function, the inverse-time overcurrent relay is easy to coordinate with other relays and has a comparatively shorter trip time, and that the fault happens in the protective zone.展开更多
The failure of magnetic field diverter resistor, resulting from the main magnetic field winding broken as magnetic field weakening operation, is analysed. The method of adding overcurrent relay on every traction motor...The failure of magnetic field diverter resistor, resulting from the main magnetic field winding broken as magnetic field weakening operation, is analysed. The method of adding overcurrent relay on every traction motor branch is proposed.展开更多
基金TheNationalNaturalScienceFoundationofChina (No .6 9774 0 2 4 )
文摘The conventional time function of electromechanical relays is hard to coordinate with other relays. In order to promote the application of inverse-time overcurrent relays, a new time function for microprocessor-type relay is proposed. The setting of the trip time for this relay is performed by determining the shortest trip time and the longest trip time, respectively. The results of analysis show that with the new time function, the inverse-time overcurrent relay is easy to coordinate with other relays and has a comparatively shorter trip time, and that the fault happens in the protective zone.
文摘The failure of magnetic field diverter resistor, resulting from the main magnetic field winding broken as magnetic field weakening operation, is analysed. The method of adding overcurrent relay on every traction motor branch is proposed.
