Abstract
The article deals with questions concerning to the main design parameters of differential-phase busbar protection switchgear with voltage 110–750 Kv of electric power stations and substations, the choice of which is provided by its selective and reliable operation in all possible power system conditions. Article contains the block diagram and operating characteristic of protection. The factors that have a direct impact on the determination error by the reacting body to protect the relationship between the phases of the currents circulating connections that are connected to the busbar system are determined. The influence degree of these factors as well as possible ways to tune away from its impact protection are given. Possibility of the differential-phase principle application for busbars protection on the basis of conditions for ensuring its sufficient sensitivity and selectivity in normal mode was analysed, when the external short circuit on the connections of the busbars and for faults in the protection zone of action. Guided by the assumptions made in carrying out an approximate calculation of the angular errors of the current transformers in the power system transient modes the characteristic which allows to set the dependence of the values of these errors on the lifetime of the transitional process in the electrical network is built
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