Improved three-phase power zero-sequence current transformer
A technology of three-phase power and zero-sequence current, which is applied in the field of electric power, can solve problems such as restrictions on application and promotion, and achieve the effects of ensuring stability, reliability, easy installation, and high strength
Inactive Publication Date: 2016-05-25
胡小青
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Problems solved by technology
[0003] Most of the existing zero-sequence current transformers are installed by means of flange installation or bonding. The installation location generally needs to be reserved, so its application and promotion are more restricted.
Method used
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Embodiment 1
[0014] This embodiment is an improved three-phase power zero-sequence current transformer, see Figure 1 to Figure 6 As shown, it includes a base pipe 1 , a core pipe 2 , two sets of pressing jaw assemblies 3 , two flat nuts 4 and a current transformer 8 .
[0015] The inner peripheral wall of the base pipe is provided with three crimping bosses 11 along the axial direction of the base pipe, and the inner wall of each crimping boss is provided with an arc-shaped groove 111; the inner peripheral wall of the base pipe is also provided with four positioning slides along the axial direction of the substrate Slot 12; the core tube and the base tube are concentrically arranged and located in the base tube lumen; the outer peripheral wall of the core tube is provided with four supporting convex plates 21 protruding radially along the core tube, and the outer ends of each supporting convex plate are located at corresponding to a positioning chute, so that the core tube is supported an...
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The invention discloses an improved three-phase power zero-sequence current transformer, which comprises a base tube, a core tube, two sets of press claw components, two flat nuts and a current transformer body, wherein the current transformer body sleeves the base tube; crimping bosses are arranged on the base tube; radial limiting slide holes are formed in the tube wall of the core tube; a stopping table is arranged on the inner circumference wall of the core tube; the two flat nuts are rotationally arranged in a tube cavity of the core tube; the two flat nuts are separately located at two sides of the stopping table; drive thread parts in each set of press claw component all are located at one side, far away from the stopping table, of the corresponding flat nut; each flat nut comprises a fastening part and a plane thread part which is meshed and matched with the drive thread parts of the press claws in the corresponding set of press claw component; each plane thread part is annular; an archimedes spiral groove is arranged on each plane thread part; a thread groove matched with each archimedes spiral groove is arranged on each drive thread part of each pressure claw component; and each flat nut drives the plane thread part thereof to rotate in a reciprocating manner, so that corresponding one set of press claw component is driven. The improved three-phase power zero-sequence current transformer has an excellent anti-looseness effect.
Description
technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to an improved three-phase electric zero-sequence current transformer. Background technique [0002] The basic principle of zero-sequence current protection is based on Kirchhoff's current law: the algebraic sum of the complex current flowing into any node in the circuit is equal to zero. When the line and electrical equipment are normal, the vector sum of the currents of each phase is equal to zero. Therefore, the secondary side winding of the zero-sequence current transformer has no signal output, and the actuator does not operate. When an electric shock or leakage fault occurs, the vector sum of the currents of each phase is not zero, and the fault current causes magnetic flux in the iron core of the zero-sequence current transformer, and the current generated by the zero-sequence current transformer is the zero-sequence current. When the protection mechanism ...
Claims
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IPC IPC(8): H01F38/30H01F27/06
CPCH01F38/30H01F27/06H01F2038/305
Inventor 胡小青
Owner 胡小青