Rogowski coil type current sensor with broken-line-shaped air gap channel
A technology of current sensor and Rogowski coil, which is applied in the direction of only measuring current, voltage/current isolation, measuring current/voltage, etc., and can solve problems such as failure of electromagnetic shielding of online monitoring sensors
Active Publication Date: 2021-12-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology
Therefore, the design and invention of this kind of Rogowski coil current sensor with zigzag air gap channel can effectively solve the problem of electromagnetic shielding failure of on-line monitoring sensors
Method used
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Embodiment Construction
[0018] Such as Figure 5 As shown, this implementation provides a Rogowski coil current sensor with a zigzag air gap channel that can be placed on the transformer bushing to measure the current signal online.
[0019] (1) Coil
[0020] The coil [2] is formed by winding a copper enameled wire [5] on a ring magnetic core [6]. The diameter of the copper enameled wire is 1 mm, and it is evenly wound on the toroidal magnetic core [6], and 200 turns are wound as required. The annular magnetic core [6] is a ferrite with good magnetic permeability, which is circular in shape, with an inner diameter of 404mm, an outer diameter of 428mm, and a height of 12mm. When the measured current passes through the coil ring along the central axis of the coil ring, the current will generate a time-varying magnetic field around it, and an electromotive force will be induced at both ends of the copper enameled wire [5].
[0021] (2) shielding case
[0022] The shielding case [1] is made of metal ...
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The invention provides a Rogowski coil type current sensor with a broken-line-shaped air gap channel. The sensor is composed of a shielding shell, a coil and a cushion block. The shielding shell is made of metal materials, the overall shape of the shielding shell is annular, the portion, close to the outer side, of the interior of the annular axial section is an inner cavity wrapped by the shielding shell, the portion, close to the inner side, of the interior of the annular axial section is provided with multiple layers of inner walls, air gaps are reserved between the inner walls, gaps are reserved in the inner walls of all the layers so that the air gaps between the layers can be communicated, and therefore a broken-line-shaped air gap channel can be formed. The broken-line-shaped air gap channel enables the inner cavity of the shielding shell to be communicated with the outside. An external interference magnetic field can be greatly attenuated after being subjected to multi-layer shielding of the broken-line-shaped air gap channel. And the coil is fixed in an inner cavity close to the outer side in the annular section of the shielding shell through a cushion block. According to the invention, the anti-interference capability of the coil type current sensor can be improved, and the measured current magnetic field is not influenced.
Description
technical field [0001] The invention belongs to the field of on-line monitoring of electrical equipment, and specifically refers to a Rogowski coil current sensor with a zigzag air gap channel that can effectively measure current signals when the electrical equipment is in normal operation. Background technique [0002] With the in-depth development of the Internet of electric energy and the advancement of electric energy substitution in more fields, the dependence of human civilization on electric energy will only continue to increase. Less power outages or no power outages, improving the reliability of power supply are of great significance to improving customer experience in using electricity and ensuring the continuous and stable operation of the current industrial system, and will also have a profound impact on the development of the power market. Opening high-voltage leads can no longer meet the needs of the current power grid for safety and reliability, and online mon...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01R19/00G01R15/18
CPCG01R19/0092G01R15/18
Inventor 程养春魏思芸彭磊沙雨飞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)