Digital zero sequence current transformer for column switch

A pole-mounted switch and zero-sequence current technology, which is applied in the field of digital zero-sequence current transformers for pole-mounted switches, can solve problems such as non-open circuit, easy saturation, and ferromagnetic resonance

Pending Publication Date: 2019-03-26
BEIJING SHUIMU YUANHUA ELECTRIC CO LTD
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  • Abstract
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Problems solved by technology

[0003] At present, the traditional zero-sequence current transformers are all electromagnetic zero-sequence current transformers. The magnetic flux density is low during normal operation, and the magnetic flux density is large during failure, which is prone to saturation problems, high internal resistance, small secondary load, and cannot be opened. It may cause ferromagnetic resonance, etc., and the output signal is a small AC signal

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  • Digital zero sequence current transformer for column switch
  • Digital zero sequence current transformer for column switch
  • Digital zero sequence current transformer for column switch

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Embodiment Construction

[0026] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] It should be clear that the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0028] figure 1 The connection diagram of the digital zero-sequence electronic transformer provided by the present invention; figure 2 A schematic diagram of the overall structure of the digital zero-sequence electronic transformer provided by the present invention; image 3 A schematic diagram of local details of the zero-sequence current PCB Rogowski coil winding provided by the present invention; Figure 4 Zero-sequence current PCB Rogowski coil embodiment provided for the present invention; Figure 5 A schema...

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Abstract

The invention discloses a digital zero sequence current transformer for a column switch, relates to the electronic transformer technology and eliminates magnetic saturation and ferroresonance problemsas the electronic transformer contains no core. The digital zero sequence current transformer includes a sensor module and a signal processing module, wherein the sensor module is used for outputtinga three-phase current in the column switch to the signal processing module, the sensor module is composed of an integrated PCB Rogowski coil, the integrated PCB Rogowski coil is formed by uniformly arranging a printed lead on a printed circuit board (PCB), and the signal processing module is used for converting the signal inputted by the sensor module into a digital signal and outputting the digital signal.

Description

technical field [0001] The invention relates to the technology of electric power system electronic transformers, in particular to a digital zero-sequence current transformer for pole-mounted switches. Background technique [0002] The safety and reliability of the power system operation are very important, and the zero-sequence current transformer is used to detect the neutral unbalanced current. When a leakage or fault occurs in the circuit, the phasor sum of the three-phase current is not equal to zero, and the resulting current is the zero-sequence current. [0003] At present, the traditional zero-sequence current transformers are all electromagnetic zero-sequence current transformers. The magnetic flux density is low during normal operation, and the magnetic flux density is large during failure, which is prone to saturation problems, high internal resistance, small secondary load, and cannot be opened. It may cause ferromagnetic resonance, etc., and the output signal i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25H01F38/30
CPCG01R19/25H01F38/30
Inventor 程干江叶闯杨幼军王保庆王保晶冯美玉王利广
Owner BEIJING SHUIMU YUANHUA ELECTRIC CO LTD
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