A method for checking the integrity of AC circuit by pressurizing the low-voltage side of railway traction station

Abstract

The invention discloses a method for verifying the integrity of an AC circuit by pressurizing the low-voltage side of a railway traction station. short-circuit current, select a power supply with appropriate capacity and a power line capable of carrying the current to connect to the primary circuit of the traction substation; by adjusting the switching status of the primary circuit of the traction substation, complete the inspection of the 27.5kV side voltage circuit and the 220kV side voltage circuit respectively. Circuit inspection, protection measurement current circuit inspection, main transformer differential polarity circuit inspection; according to the inspection results, judge whether each inspected circuit is normal. The invention makes up for the pressure on the high-voltage side and the short-circuit on the low-voltage side in the past. The sampling value of the microcomputer device is too low and the measurement accuracy is not enough, which makes it difficult to judge the state of the AC circuit through the data when the measurement error is included.

Description

technical field [0001] The invention relates to the field of power transmission, in particular to a method for verifying the integrity of an AC circuit by pressurizing the low-voltage side of a railway traction station. Background technique [0002] In the past, after the construction of the railway traction substation was completed and tested, due to various reasons, the current and voltage sampling was not in place, the main transformer differential polarity circuit was wrong, the current circuit was open circuit and the voltage circuit was short circuited during the power transmission process due to various reasons. Issues such as safety hazards will affect the opening of power transmission and have a negative impact on the reputation of production enterprises. In the past, the method of adding voltage on the high-voltage side of the transformer and short-circuiting the low-voltage side collected the voltage and current values ​​of each circuit, and analyzed whether the c...

AI Technical Summary

Problems solved by technology

When the high-voltage side is connected with a 400V three-phase AC power supply and the low-voltage side is open, the voltage data collected by the microcomputer protection device is only about 0.182V. The collected secondary current value on the high-voltage side is only about 0.004A, and the secondary current value on the low-voltage side is only about 0.005A, while the measurement accuracy of the microcomputer protection device is 0.001. When the measurement error is included, it is difficult to judge from the data AC loop status

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