The influences on longitudinal force of train include braking ratio, train configuration, coupler clearance and brake wave velocity, etc.

Analysis of the relationship between operation current and restraint coefficient for ratio restraint setting of differential relay;

By comparing the product restraint quantity with the ratio restraint quantity which used in the criterion of the differential protection, some new conceptions and schemes are proposed in this paper: (1)Identity of the product restraint criterion and the ratio restraint criterion.

In terms of the problems occured during the ratio restraint longitudinal differential protection operating especially the restraint current is decreased owing to the increment of unbalanced current and saturation of the longitudinal differential protection caused by CT in external short circuit transient fault.

Proper and different ratio brake coefficient are proposed,which should be selected to solve the misaction possibility beyond the distributed protecti.

Study on selection method of electric braking power for railway vehicles with AC drive;

This article deals with the design of the braking unit of the power supply of TMPs and the calculation method of their braking power and braking resistance, providing the basis for choosing ideal braking resistance of TMPs.

Design of locomotive braking shoes and foundation braking equipment based on braking power was investigated.

Analysis and treatment of maloperation problem of percentage restraint type generator longitudinal differential protection;

Application of compound percentage restraint in transformer differential protection;

Detailed analysis of several parameters about transformer percentage restraint type longitudinal differential protection;