It also can protect the magnetic restraint busbar protection from mal-operation possibly caused by variation of the secondary load of CT.

The principle of REB103 bus differential protection for the Three Gorges Left Bank Hydropower Station is introduced in detail.

The Characteristic of middle impedance relay was elaborated, as an example of bus differential protection of RADSS type.

This paper simply describes the mathematic model for computer setting calculation of bus aifferential protection,consideration of operation mode,protection setting principle,and setting calculation Program of the bus differential protection written basing on the above method.

3GS) HVDC interconnection project and give the advice for the future HVDC projects, we analyzed a fault trip of pole bus differential protection during the system debugging of Yidu-Huaxing 3GS HVDC that connects Central China Power Grid with East China Power Grid.

Digital bus protection based on optical current transducer;

Characteristics of distributed microprocessor-based bus protections;

Transient high-frequency current characteristics of UHV busbar fault and countermeasures in busbar protection;

XRB-220 adaptive busbar protection set;

Problems and countermeasures for microprocessor-based busbar protection;

The ANN model of bus-bar protection;

Interface problem between bus-bar protection and transformer protection;

This paper describes the status quo of power supply of the meso-low power supply system,analyzes the reasons for differential protection maloperation of the meso-low power supply system and its treatment,discusses the longitudinal differential protection principles for 10 kV power supply system and points out the necessity of bus-bar protection for 10KV power supply system.