Localization of the current of commutator traction motors in constant operation modes of electric stock

Аннотация

A problem of evaluating the possibility of a proposed devise to limit motor current when supply voltage is restored after a short period of separation of a pantograph from a contact wire is formulated. An analysis of the transient processes in the circuits of the traction commutator motors under transient operation modes of the electric stocks and the current limiter in the course of voltage recovery on the pantograph after its separation from the contact wire, the assessment of the variants of feeding the excitation winding; calculation of the parameters of the proposed current limiters; development of variants of computer models; and investigation of the transient processes in the traction motor chain at the supply voltage recovery are carried out in the present article. The effect of excitation winding feeding on the additional power source, as well as the area of possible limitation and exclusion of the motor current inrushes I the course of voltage source recovery, are estimated. The variants of the discharge of the storage element on the excitation winding and the relationships between the capacitor parameters depending on the required value of the winding voltage are considered. A method of controlling excitation winding current from an independent source is implemented. The use of the method and the protection device allows one to increase the commutation resistance of the traction motors at the inrushes or the voltage recovery after loss of the contact of the pantograph with the contact wire, to decrease the possible commutation violation, and to reduce the number of failures.