Integral connecting structure of transformer and current sensor

Abstract

The invention discloses a connecting structure of a transformer and a current sensor. The structure comprises the transformer and the current sensor, wherein a transformer shell is provided with a tap bushing of the transformer; a ground terminal is arranged in the tap bushing; a current sensor shell is internally provided with a sensor core; the sensor core is provided with a feed-through hole; a conducting element is arranged in the feed-through hole; the current sensor is directly and fixedly connected with the tap bushing of the transformer through the current sensor shell; one end of theconducting element is connected with the ground terminal, while the other end is connected with the current sensor shell. The sensor realizes seamless connection in real sense on the ground terminal and the current sensor;as the ground terminal is directly connected with the ground conducting element in the sensor, the integral structure does not change the mode of bushing tap grounding and does not affect the normal operation of main equipment; as the ground conducting element is arranged inside the sensor, the integral structure greatly reduces the serial in of a field electromagnetic interference signal of the transformer, improves the signal to noise ratio for the sensor collecting signals, and establishes good foundation for lossless sampling of a current signal.

Description

technical field [0001] The invention relates to a sensor used in a power system for on-line monitoring of the insulation performance of a power transformer. Background technique [0002] The transformer is the most important equipment in the power system, and its normal operation is the key to ensure the safe operation of the power grid. Therefore, the power sector needs to measure, evaluate and diagnose the operating status of the transformer. The insulation performance of the transformer bushing is a very important parameter for the operating state of the transformer. Generally, it can be monitored by analyzing and detecting the amplitude and phase changes of the ground current at the end screen of the transformer bushing. [0003] To accurately understand the insulation performance of the transformer bushing in the operating state, the extraction of the current signal is very critical. Only by obtaining the real and accurate current signal first can the follow-up link hav...

AI Technical Summary

Problems solved by technology

But there are also two problems, one is to lengthen the grounding lead, which increases the grounding inductance, and the other is that there is a distance between the end screen outlet and the core hole of the sensor, because it is in a strong electromagnetic field environment, it is susceptible to electromagnetic interference, and at the same time Working outdoors for a long time is easily affected by atmospheric conditions such as temperature and humidity, so this distance will introduce a lot of electromagnetic interference, which increases the signal-to-noise ratio of the collected signal

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