High-voltage zero-sequence current power transformer with relatively good wire clamping fastness

Abstract

The invention discloses a zero-sequence current power transformer with relatively good wire clamping fastness, comprising a base tube, a core tube, two sets of pressing jaw assemblies, a plane nut and a current transformer; three press-connection lug bosses are arranged on the inner peripheral wall of the base tube; six radial limiting slide holes are arranged on the tube wall of the core tube; the current transformer is sleeved on the outer wall of the base tube; every set of pressing jaw assembly comprises three pressing jaws; the panel nut is rotationally arranged in the tube cavity of the core tube; a panel threaded part is respectively arranged at two sides of the panel nut upward along the radial direction of the core tube; a fastening part is arranged at the center of the plane nut; every panel threaded part is in engaged fit with the drive threaded part of every pressing jaw in a corresponding set of pressing jaw assembly; the panel nut drives the two panel threaded parts to carry out reciprocating rotation so as to synchronously drive every pressing jaw in the two sets of pressing jaw assemblies to be close to or be away from the center of the core tube. The zero-sequence current power transformer has relatively good anti-loose effect.

Description

technical field [0001] The invention belongs to the technical field of electric power, and in particular relates to a high-voltage zero-sequence current transformer with better clamping fastness. 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 protectio...

AI Technical Summary

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.

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