Antijamming signal transferring cable and high-speed high-amplitude pulse current sensor

Abstract

The antijamming signal transferring cable consists of enameled twisted pair line, insulating layer, shield layer and protective jacket. The high-speed and high-amplitude pulse current sensor includes the antijamming signal transferring cable, Hall chip, shielding cover and conductor section. The antijamming signal transferring cable is split into two signal lines connected to the two signal electrodes of the Hall chip and the power transmission line are connected to the power electrodes of the Hall chip. The Hall chip is installed inside the shield cover, the shield cover is connected with the shielding layer of the antijamming signal transferring cable to constitute one current sensing element and the current sensing element is connected to the conductor section to constitute a current sensor.

Description

1. Technical field [0001] The invention relates to a signal transmission cable with high anti-interference ability in a high-speed changing non-uniform strong magnetic field and a current sensor for measuring high-speed high-amplitude pulse current. 2. Background technology [0002] For the measurement of high-speed and high-amplitude pulse currents, current sensors made of Rogowski coils are generally used at present (see "Lightning Current Automatic Monitoring System", Lin Yunzhi, etc., Department of Electrical Engineering, Tsinghua University, "New Technology of Electrical Engineering and Energy", P59-62, 2000, p. 4 issues). Since the output voltage of this type of current sensor is proportional to the rate of change of the measured current over time rather than the amplitude of the measured current, the output voltage needs to be integrally transformed in actual use, which not only increases the cost of signal processing difficult and will reduce the measurement accurac...

AI Technical Summary

Problems solved by technology

[0004] 1. The conventional Hall current sensor adopts a ferromagnetic magnetic circuit, which is limited by the saturation flux density of ferromagnetic materials. The upper limit current that this Hall current sensor can measure is limited by its power consumption and volume, and the capacity has not yet been reached. Ten thousand ampere Hall current sensor coverage;

[0005] 2. Instead of using a ferromagnetic magnetic circuit, the Hall chip is directly placed near the current-carrying conductor of the measured current. Although the measurable current amplitude is almost unlimited, it requires the transmission line connected to the Hall chip to change at a high speed. It has excellent anti-interference performance in the non-uniform strong magnetic field. At present, the transmission cable connected to the Hall chip usually uses a multi-core shielded cable. Each core wire of this cable is a single or multiple copper wires wrapped by a plastic sheath. , when this type of cable (even if its core wire is a twisted pair) is connected to the electrodes or leads of the Hall chip, a large lead loop area will be formed at the connection, and the large-area lead loop is connected to the measured high-speed high-amplitude The cross-linking of the magnetic field lines generated by the value current will generate a large additional induction signal proportional to the rate of change of the measured current with time, and the superposition of the additional induction signal and the Hall signal proportional to the measured current will greatly improve the measurement accuracy. reduced, or even impossible to obtain correct measurement results

In addition, ordinary multi-core shielded cables can only achieve electrical shielding but not magnetic shielding. When this kind of cable is in a high-speed changing strong pulse magnetic field, the core wire of the cable will also be induced with additional induction signals that seriously affect the measurement results.

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