STAND FOR IDENTIFYING SHORT-CIRCUIT CURRENTS OF INTER-SUBSTATION ZONE OF TRACTION NETWORK Russian patent published in 2023 - IPC G01R31/08 G01R19/28 B60M1/00 

FIELD: power supply.

SUBSTANCE: invention is related to a power supply system for a traction network and can be used to identify the short-circuit (SC) currents of an inter-substation section of an alternating current traction network with two-way power supply. The external power supply circuit is represented by three resistances Z₀₁, Z₀₂, Z₁₂ connected in a "triangle" scheme. Resistances Z₀₁ and Z₀₂ connect the inputs B_A and B_B of substations A and B with the second output of power source U_o, and resistance Z₁₂ connects the same inputs of substations A and B. Resistance Z₁₂ is calculated based on the actual cross section and length of the line. Resistances Z₀₁ and Z₀₂ are determined using the following expressions:

Z₀₁ = [(Z₁₂)²-2Z_C1Z₁₂]/[2(Z_C1-Z₁₂-Z_C2)] – √[(Z₁₂)⁴+4Z_C1Z_C2(Z₁₂)²]/[2(Z_C1-Z₁₂-Z_C2)], Z₀₂ = [(Z₁₂)²-2Z_C2Z₁₂]/[2(Z_C2-Z₁₂-Z_C1)] – [√{(Z₁₂)⁴+4Z_C1Z_C2(Z₁₂)²}]/[2(Z_C2-Z₁₂-Z_C1)], where Z_C1 and Z_C2 are SC resistances at inputs B_A and B_B of traction substations A and B. Based on the calculated resistances, the voltage of power source U_o and the readings of ammeters A_A and A_B, short-circuit currents I_A and I_B are determined for the corresponding circuits.

EFFECT: improving the accuracy of determining SC currents.

1 cl, 1 dwg