Abstract
The conditions of RZA device operation at different earth methods of contact system masts are under analysis. The analysis of the ways of SC current behavior at different methods of contact system mast grounding is carried out, the factors influencing the scenarios of development and circuit parameters of SC are emphasized. 
 The investigation object is an operating area of the railway located in the far East of Russia, and investigation subjects are its devices of relay protection of the contact system feeders. There are used methods of a structured observation and statistical analysis of in-situ resistance measurement results of contact system masts and parameters measured with protection, a simulation method of traction power supply system, method of data visualization on a complex plane. 
 There is carried out a type classification of contact system mast earth, the analysis of short circuit current behavior at different earth types of ac contact system mast is fulfilled, the estimate of the impact degree of transient resistance arising at the moment of short circuit under conditions of remote protection operation is carried out. 
 The most probable reason of remote protection non-operation in case of short circuit on non-earthed contact system masts is revealed. On the basis of the results obtained in the course of full-scale measurement there is compiled a diagram of a share distribution of contact system masts with the different value of active resistance. It is determined that the overwhelming majority of contact system masts have less 20 kOhm active resistance, but there is marked the presence of contact system masts with a high value of active resistance that is evidence of unintentional un-earth which worsens deeply the operation of relay protection devices. According to the results of the investigations carried out there is offered a method of data visualization on a complex plane on the basis of the results of the modeling of traction power supply system parameters and in-situ measurements which allows approaching in a complex way to the solution of the problem in relay protection device operation stability increase under conditions of heavy-freight motion intensity and volume increase.
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