Station AC current data acquisition device and acquisition method thereof

Abstract

The invention discloses a station AC current data acquisition device and acquisition method thereof. The device comprises a residual current monitoring screen, and the input end of the residual current monitoring screen is electrically connected with a background control terminal through a data transmission line. Data such as the current of the neutral grounding point at the low-voltage side of the transformer, the residual current of the whole station, the residual current of the feeder loop, the environment temperature and the like are monitored in real time, so that the internal current condition of the transformer substation can be mastered in time;at the same time, by monitoring the important or long-distance feeder cable body or armored current, the insulation state of the cable body is monitored, the on-off signal or the tripping signal of the switch is monitored in real time, the equipment operation condition of a low-voltage AC system is known more comprehensively, when the residual current exceeds the limit, the residual current terminal starts switch linkage control, a fault line is cut off in time, accident expansion is prevented, and practical application is facilitated.

Description

technical field [0001] The invention belongs to the field of current data collection, in particular to a station-use alternating current data collection device and a collection method thereof. Background technique [0002] The substation refers to the place where the voltage and current are transformed, received and distributed in the power system. The substation in the power plant is a step-up substation. Its function is to boost the power generated by the generator and feed it to the high-voltage power grid. In the existing life, AC cables fire accidents often occur inside substations, and there are two main reasons for fires in low-voltage AC cables: the first is that when a metal short circuit fault occurs in the cable, the sensitivity of the protective circuit breaker is insufficient, and it cannot The second is that when the insulation damage of the cable occurs and creepage arcs, due to the high resistance of the arc, it is a high-impedance grounding situation, and th...

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Problems solved by technology

[0002] The substation refers to the place where the voltage and current are transformed, received and distributed in the power system. The substation in the power plant is a step-up substation. Its function is to boost the power generated by the generator and feed it to the high-voltage power grid. In the existing life, AC cables fire accidents often occur inside substations, and there are two main reasons for fires in low-voltage AC cables: the first is that when a metal short circuit fault occurs in the cable, the sensitivity of the protective circuit breaker is insufficient, and it cannot The second is that when the insulation damage of the cable occurs and creepage arcs, due to the high resistance of the arc, it is a high-impedance grounding situation, and the protective circuit breaker cannot be tripped, but the temperature of the arc is very high at this time. cause cable fire

[0003] However, in the prior art, there is a lack of a station-use AC current data acquisition device to collect the current data of the cables inside the substation in real time, so that it is impossible to monitor the cable current in real time, and then take corresponding safety measures in time to avoid the cable fire. occur

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