Field bus type AC current transformer

Abstract

The invention discloses a field bus type AC current transformer, which comprises a primary current conductor capacitive screen, a secondary electrostatic screen, a current transformer iron core for measurement, a current transformer iron core for protection, a current transformer secondary winding for measurement, a current transformer secondary winding for protection and a primary current conductor. The field bus type AC current transformer is characterized by further comprising a PCB (printed circuit board) and a field bus connector. An outgoing line of the current transformer secondary winding for measurement is connected to a secondary current input end for measurement of the PCB; an outgoing line of the current transformer secondary winding for protection is connected to a secondary current input end for protection of the PCB; the primary current conductor capacitive screen is connected to a secondary voltage input end of the PCB; and a signal output end of the PCB is connected to the field bus connector. The purposes of carrying out signal processing on state information and control information of alternating current under a field bus condition and performing signal interaction with a field bus are realized by using the field bus type AC current transformer.

Description

technical field [0001] Embodiments of the present invention relate to transformer technology, in particular to a field bus type AC current transformer. Background technique [0002] AC current transformers are widely used in 10kV power systems, including power distribution and power consumption devices and distribution network automation systems. In the era of distributed access to renewable energy, it is required that the current transformer used in the 10kV power system needs to have the ability to perform signal processing on the state information and control information of the AC current, as well as the ability to perform signal interaction with the field bus. [0003] At present, the current transformers used in the 10kV power system are only simple physical quantity converters in essence. The secondary winding converts the primary AC current into a secondary AC current that is inversely proportional to the number of turns of the primary winding and the secondary windi...

AI Technical Summary

Problems solved by technology

It can be seen that the existing current transformers only have the function of current proportional conversion or current-to-voltage proportional conversion, but cannot adaptively realize the signal processing of the state information and control information of the AC current, and the signal interaction with the field bus

[0004] Under the condition of fieldbus, the existing current transformer needs to use the digital processor or network host on site to realize the above-mentioned signal processing and interactive functions, which leads to the complex circuit of the 10kV power system under the condition of fieldbus, and the installation and maintenance are not easy. convenient

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