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CN-122026272-A - Multi-mode fault current mechanical guiding device of power distribution system

CN122026272ACN 122026272 ACN122026272 ACN 122026272ACN-122026272-A

Abstract

The invention relates to the technical field of electric equipment circuit protection, in particular to a multi-mode fault current mechanical guiding device of a power distribution system, which comprises a supporting box, a power distribution box and a power distribution box, wherein a dual-mode fault current guiding mechanism is arranged in the supporting box; the system comprises a support box, a leakage current starting valve unit, a leakage inversion boosting grid-connected circuit, a bypass safety circuit and a bypass safety circuit, wherein the leakage current starting valve unit is positioned in the support box, the leakage inversion boosting grid-connected circuit is positioned in the support box, the bypass safety circuit is positioned in the support box, intelligent identification and selective guiding of fault current are achieved through cooperation of a dual-mode fault current guiding mechanism and the leakage current starting valve unit, automatic switching of multiple working modes is completed, and a grading and reliable safety protection path is formed. The invention realizes intelligent identification and grading protection of fault current through mechanical path switching based on the current threshold, overcomes the protection limitation of 'one-trip' of the traditional single-threshold electronic switch, and realizes the organic unification of safety, energy conservation and intelligence.

Inventors

  • SENG XUEMING
  • HE TAO
  • Xue Tiansheng
  • LI QUAN

Assignees

  • 漏四堡电力科技有限公司

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. A multi-mode fault current mechanical steering device for an electrical distribution system, comprising: The support box (1) is internally provided with a bimodal fault current guiding mechanism; a leakage current starting valve unit (2) positioned in the supporting box (1); the leakage inversion boosting grid-connected circuit (3) is positioned in the supporting box (1); The bypass safety circuit (4) is positioned in the supporting box (1) and comprises two input ends and an output end; The intelligent identification and selective guidance of fault current are realized through the cooperative coordination of the dual-mode fault current guiding mechanism and the leakage current starting valve unit (2), so that the automatic switching of multiple working modes is completed, and a graded and reliable safety protection path is formed.
  2. 2. The multi-mode fault current mechanical guiding device of the power distribution system according to claim 1, wherein the dual-mode fault current guiding mechanism comprises an input end, a low current output end and a high current output end, wherein the input end is connected with stable direct current processed by a rectifying and filtering circuit, the low current output end is electrically connected with the input end of a leakage current starting valve unit (2), and the high current output end is electrically connected with the input end of a bypass safety circuit (4).
  3. 3. The multi-mode fault current mechanical guiding device of the power distribution system according to claim 1, wherein the leakage current starting valve unit (2) comprises an input end and two output ends, and the two output ends are respectively and electrically connected with the input ends of the leakage inversion boosting grid-connected circuit (3) and the bypass safety circuit (4) to form multi-mode fault current guiding.
  4. 4. The multi-mode fault current mechanical guiding device of the power distribution system according to claim 1, wherein the dual-mode fault current guiding mechanism comprises a driving mechanism, a transmission mechanism and an insulating disc (11), the insulating disc (11) is arranged on the bottom wall of the supporting box (1), a functional cavity is arranged at one end of the insulating disc, two conductive sliding rods (12) which are in disconnection arrangement are arranged in the functional cavity, a rotary valve core (13) is arranged at the center of the insulating disc (11) and is electrically connected with the conductive sliding rods (12), two wiring terminals (14) are arranged at one end of the insulating disc (11), and the two conductive sliding rods (12) are electrically connected with a leakage current starting valve unit (2) or a bypass safety circuit (4) through the adjacent wiring terminals (14).
  5. 5. The multi-mode fault current mechanical guiding device for a power distribution system according to claim 4, wherein the rotary valve core (13) comprises an insulating valve rod (131) rotatably installed at the central position of the insulating disc (11), a through insulating tube (132) is arranged on the side wall of the insulating valve rod (131), a conductive slip ring (133) is arranged at one end, far away from the insulating valve rod (131), of the insulating tube (132), and is electrically coupled with the conductive sliding rod (12), and the conductive slip ring (133) is electrically connected with an input electric wire (134).
  6. 6. A multi-mode fault current mechanical guide device for an electrical distribution system according to claim 5, wherein the input wire (134) passes through the insulating tube (132) and the insulating valve stem (131), and a rectifying and filtering circuit is connected to an end of the input wire remote from the conductive slip ring (133).
  7. 7. A multi-mode fault current mechanical guiding device for an electrical distribution system according to claim 4, wherein one end of the insulating disc (11) is provided with a groove, and the connection terminal (14) is located in the groove of the insulating disc (11).
  8. 8. The multi-mode fault current mechanical guide device of the power distribution system according to claim 4, wherein the driving mechanism comprises an exciting coil (31) which is arranged on the bottom wall of the supporting box (1) to form a driving source, and the exciting coil (31) is connected in series in a main line of the rectifying and filtering circuit.
  9. 9. The multi-mode fault current mechanical guiding device of the power distribution system according to claim 4, wherein the transmission mechanism comprises a plate seat (21), the plate seat is fixedly arranged on the bottom wall of the supporting box (1) and is positioned between the driving mechanism and the insulating disc (11), a transmission shaft (22) is arranged in a penetrating and sliding mode at the center of the plate seat (21), an armature (23) is arranged at one end, close to the driving mechanism, of the transmission shaft (22), a T-shaped section of the transmission shaft (22), a spring (24) is arranged between the transmission shaft (22) and the plate seat (21), a first transmission rod (25) is hinged to one end, close to the insulating disc (11), of the transmission shaft (22), a second transmission rod (26) is hinged to one end, close to the transmission shaft (22), of the first transmission rod (25), and the second transmission rod (26) is fixedly connected with the rotary valve core (13) through a fastener.
  10. 10. A multi-mode fault current mechanical guide device for an electrical distribution system according to claim 9, wherein the armature (23) is arranged coaxially with the exciting coil (31), and when the exciting coil (31) is energized, the armature (23) is axially displaced by electromagnetic force.

Description

Multi-mode fault current mechanical guiding device of power distribution system Technical Field The invention relates to the technical field of electric equipment circuit protection, in particular to a multi-mode fault current mechanical guiding device of a power distribution system. Background Leakage current faults are a common safety hazard in low voltage power distribution systems. When the insulation of an electrical device ages, wets or is damaged, leakage currents of varying degrees can occur, resulting in an increase in the voltage to ground (i.e., leakage voltage) of the device housing. When the leakage voltage exceeds the safe extremely low voltage (usually 50V), the personal electric shock accident is extremely easy to occur, meanwhile, the continuous leakage current can generate electric arc and heat, and if the leakage voltage cannot be effectively discharged or cut off, the electric fire disaster can be caused. At present, the traditional leakage protection device mostly adopts an electronic leakage switch with a single threshold value, and when the leakage current exceeds a set value, the circuit is directly cut off. The protection mode of the one-knife switch has obvious limitations that, on one hand, for slight leakage current which does not exceed an action threshold value, the traditional protector does not respond, so that the leakage energy is continuously wasted and insulation aging can be accelerated for a long time, and on the other hand, when serious overcurrent or short-circuit faults occur, the response speed and the current-resisting capacity of the electronic switch are limited, the voltage is difficult to drop to a safety range in a very short time, and a protection blind area exists. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a multi-mode fault current mechanical guiding device of a power distribution system, which can solve the problems in the background art. The aim of the invention can be achieved by the following technical scheme: A multi-mode fault current mechanical steering device for an electrical distribution system, comprising: The support box is internally provided with a bimodal fault current guiding mechanism; the leakage current starting valve unit is positioned in the supporting box; The leakage inversion boosting grid-connected circuit is positioned in the supporting box; The bypass safety circuit is positioned in the supporting box and comprises two input ends and an output end; The intelligent identification and selective guidance of fault current are realized through the cooperative coordination of the dual-mode fault current guiding mechanism and the leakage current starting valve unit, the automatic switching of multiple working modes is completed, and a graded and reliable safety protection path is formed. Preferably, the bimodal fault current guiding mechanism comprises an input end, a low current output end and a high current output end, wherein the input end is connected with the stable direct current processed by the rectifying and filtering circuit, the low current output end is electrically connected with the input end of the leakage current starting valve unit, and the high current output end is electrically connected with the input end of the bypass safety circuit. Preferably, the leakage current starting valve unit comprises an input end and two output ends, wherein the two output ends are respectively and electrically connected with the input ends of the leakage inversion boosting grid-connected circuit and the bypass safety circuit to form multi-mode fault current guiding. Preferably, the bimodal fault current guiding mechanism comprises a driving mechanism, a transmission mechanism and an insulating disc, wherein the insulating disc is arranged on the bottom wall of the supporting box, a functional cavity is formed in one end of the insulating disc, two conductive sliding rods which are disconnected are arranged in the functional cavity, a rotary valve core is arranged in the center of the insulating disc and is electrically connected with the conductive sliding rods, two wiring terminals are arranged at one end of the insulating disc, and the two conductive sliding rods are electrically connected with the leakage current starting valve unit or the bypass safety circuit through the adjacent wiring terminals respectively. Preferably, the rotary valve core comprises an insulating valve rod, the insulating valve rod is rotatably arranged at the central position of the insulating disc, a through insulating pipe is arranged on the side wall of the insulating valve rod, an electric conduction slip ring is arranged at one end, far away from the insulating valve rod, of the insulating pipe, electric coupling is formed between the insulating pipe and the electric conduction slip ring, and the electric conduction slip ring is electrically connected with an input wire. Preferably, the input wire passes