Pressure type current transformer

Abstract

The invention discloses a pressure type current transformer, and belongs to the field of power systems. The invention aims to provide the pressure type current transformer for measuring the current of a measured circuit by using the left hand rule principle, namely the stress change of an electrified lead in a magnetic field. A bus passes through a shielding shell and an insulating layer and is clamped through a fixed clamping lock, a copper core is connected with a direct-current power supply, a pressure sensor A is arranged on the upper side of the copper core, a pressure sensor B is arranged on the lower side of the copper core, the pressure sensor A and the pressure sensor B are connected with a transmitter, the transmitter is connected with a processor through a shielding signal wire, and the processor is connected with a 485 bus. Compared with the traditional electromagnetic current transformer, the pressure type current transformer has the advantages of electromagnetic interference resistance, un-saturation, large measurement range, wide frequency band, digital signal transmission, small volume, light weight and the like.

Description

technical field [0001] The invention belongs to the field of power systems. Background technique [0002] Current transformer is an important equipment for electric energy measurement and relay protection in power system. Its accuracy and reliability are closely related to the safe, reliable and economical operation of power system. However, with the development of the power industry, the capacity of the power transmission system continues to increase, and the operating voltage level is getting higher and higher. At present, the highest voltage level of my country's power grid has reached 500 kV, and the next voltage level may be 750 kV or 1000 kV. At this time, the traditional electromagnetic current transformer has exposed a series of serious shortcomings: the insulation structure of the current transformer will be very complicated, and the cost will increase sharply; due to the inherent magnetic saturation and ferromagnetic resonance of the electromagnetic induction curre...

AI Technical Summary

Problems solved by technology

At this time, the traditional electromagnetic current transformer has exposed a series of serious shortcomings: the insulation structure of the current transformer will be very complicated, and the cost will increase sharply; due to the inherent magnetic saturation and ferromagnetic resonance of the electromagnetic induction current transformer , small dynamic range, narrow frequency band, and flammable and explosive oil, etc., it is difficult to meet the development needs of the new generation of power system on-line detection, high-precision fault diagnosis, power digital network, etc.

Images