Electromagnetic short circuit current rapid identification device and method
A short-circuit current and identification device technology, which is applied in the direction of voltage/current isolation, measuring device, and current-only measurement, can solve problems such as malfunction and refusal to avoid losses and improve anti-interference ability
Active Publication Date: 2017-12-15
XI AN JIAOTONG UNIV
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Problems solved by technology
In addition, because the whole process uses weak current signals for data transmission, and short-circuit detection devices are mostly arranged in high-voltage, high-current working environments, there have been cases of malfunction and rejection caused by component failure and electromagnetic interference in practice.
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Embodiment Construction
[0025] The present invention will be further described through specific embodiments below in conjunction with the accompanying drawings.
[0026] attached figure 1 It is a schematic diagram of the overall structure of the electromagnetic short-circuit current rapid identification device in Embodiment 1 of the present invention, as figure 1 As shown, the electromagnetic short-circuit current identification device mainly includes a conductive bar 1, a yoke 2, a metal ring 3, a rotating shaft 4, a conductor 5 and a torsion spring 6, wherein the two ends of the conductive bar 1 are connected in series to the terminal to be identified. In the power supply line, the yoke 2 surrounds the conductive bar 1 with a fixed gap, and the yoke 2 has a fracture, and the metal ring 3 and the rotating shaft 4 are accommodated in the fracture, and the rotating shaft 4 passes through the The through holes provided by the metal ring 3 relative to the two frames allow the metal ring 3 to rotate aro...
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The present invention provides an electromagnetic short circuit current rapid identification device and method. In a process that short-circuit current rises, a surrounding magnetic field is enhanced quickly, when the magnetic field passes through a closed metal ring, eddy current is induced in the metal ring and the metal ring rotates around a rotating shaft under the effect of a magnetic field, once the metal ring rotates, the metal ring is separated from a conductor which is in contact with the metal ring, and the short circuit current is identified and judged through the change of a contact signal. The structure of the device is simple, at the same time, the quickness and accuracy of short circuit identification can be ensured, the device is particularly suitable for issuing action instructions for switch and current limiting device operating mechanisms, and the reliability of operation of electrical equipment is improved.
Description
technical field [0001] The invention belongs to the technical field of limiting and breaking fault currents in high-voltage, medium-voltage or low-voltage switchgear, and particularly relates to an electromagnetic short-circuit current rapid identification device and method. Background technique [0002] With the increase of power system capacity year by year, the short-circuit capacity and short-circuit current level of the power grid are also increasing, which has become an important problem restricting the operation and development of the power grid. The electrodynamic effect and thermal effect generated by the short-circuit current will cause severe impact on the electrical equipment and lines in the system. If the short-circuit current cannot be cut off within the allowed time, it will cause permanent damage to the electrical equipment in the system, and even cause The collapse of the entire power supply system. Especially for DC systems, the short-circuit current rise...
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IPC IPC(8): G01R19/00G01R15/20G01R31/02
CPCG01R15/20G01R19/0092G01R31/50
Inventor 吴翊何海龙荣命哲杨飞杨倬
Owner XI AN JIAOTONG UNIV