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Spiral type hollow coil current-sensing device

A current sensor, air-core coil technology, applied in the direction of inductors, voltage/current isolation, circuits, etc., can solve the problems of slow response, poor linearity, low anti-electromagnetic interference ability, etc., to achieve low cost, improve saturation characteristics and linearity The effect of improving the measurement accuracy and anti-electromagnetic interference ability

Inactive Publication Date: 2007-05-23
长沙同庆电气信息有限公司
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AI Technical Summary

Problems solved by technology

[0006] In order to solve the existing problems of current sensors such as easy saturation, slow response, poor linearity, and low anti-electromagnetic interference ability, the present invention provides a spiral tube type hollow sensor with high precision, good linearity, and strong anti-electromagnetic interference ability. coil current sensor

Method used

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  • Spiral type hollow coil current-sensing device
  • Spiral type hollow coil current-sensing device
  • Spiral type hollow coil current-sensing device

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Embodiment Construction

[0022] See Figure 3, 1 in Figure 3 is a non-magnetic straight cylindrical frame, 2 and 3 are the head and tail ends of the secondary coil wound on the frame, and the secondary coil is evenly and densely wound on the frame with thinner enamelled copper wire. Winding from the head end to the tail end of the skeleton, and then winding back to the head end, repeated winding in this way can finally form a multi-layer multi-turn helical tube sensing coil, preferably in an odd number of turns, so that it is easy to distinguish the head and tail ends of the coil, so that it is convenient for adjacent coils The secondary coils on the skeleton are connected at the head end or at the end in turn, as can be seen from Figure 2.

[0023] In Fig. 1, 4, 5, 6, 7 are all the same helical tube sensing coils wound with secondary coils, and are closely and evenly distributed on a circle around a center, leaving gaps for primary conductors to pass through. The primary conductor 8 surrounds half of ...

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Abstract

The invention discloses a helical tube hollow coil current sensor, including even number, more than four, of helical tube sensing coils winding on the non-magnetic straight-shaped frame, and all helical tube sensing coils surrounding an axis with parallel symmetric distribution, and serial connecting according to limitation mode, and its configuration makes that a public electromagnetic field induces the electromotive force in all of the helical tube sensing coils to stack and mutual counteract, and it retains the two ends as the output signal ends, to form the second coil. The first coil surrounds half number of the helical tube sensing coils without mutual adjacent, to establish a single-circle or multi-circle helical tube coils, or close to each second helical tube coils to windingly make the same number of serial connecting multi-circle single-layer or multi-layer helical tube coil. The invention has the advantages of strong electromagnetic resistance interference ability, high precision, good linearity, and fast response, suitable for the production of the sensor head of electronic current transformer, and also can be used to produce the current sensor for secondary measurement, monitoring and computer protection devices of conventional current transformer.

Description

technical field [0001] The invention relates to a current sensor, in particular to a helicoidal hollow coil current sensor for measurement and protection in a power system. Background technique [0002] At present, the current transformers used in power systems are mainly electromagnetic current transformers. In order to meet the needs of power system development and power system automation and digitization, current transformers using other induction principles have also been developed at home and abroad. According to the selection of the sensor head, it is mainly divided into two types: pure optical current transformer based on the Faraday magneto-optical effect principle and electronic current transformer based on Rogowski (hollow) coil. [0003] The electromagnetic current transformer is composed of an iron core and primary and secondary windings. Its main disadvantages are: 1. The technical requirements for insulation are complicated, and it is flammable and explosive. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/18H01F38/28
Inventor 周有庆龚伟吴桂清彭红海
Owner 长沙同庆电气信息有限公司
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