CN215870749U

CN215870749U - Device for auxiliary treatment of interphase short circuit

Info

Publication number: CN215870749U
Application number: CN202122214124.8U
Authority: CN
Inventors: 薛占钰; 邢进春; 杨贤; 丁同同
Original assignee: Baoding Yuxin Electrical Technology Co ltd
Current assignee: Baoding Yuxin Electrical Technology Co ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2022-02-18
Anticipated expiration: 2031-09-14

Abstract

The utility model discloses a device for auxiliary treatment of interphase short circuit, which comprises four switches, wherein a first switch and a second switch are respectively connected with a first phase and a second phase of a three-phase circuit breaker in parallel, a third switch is connected between a third phase lower port of the three-phase circuit breaker and the ground, and a fourth switch is connected between the second phase lower port of the three-phase circuit breaker and the ground. The device can realize the conduction of one fault phase and the grounding of the other fault phase under the condition that the existing three-phase circuit breaker cuts off a three-phase line.

Description

Device for auxiliary treatment of interphase short circuit

Technical Field

The utility model relates to the field of power supply system fault processing, in particular to a device for assisting in processing interphase short circuit in a power supply system.

Background

At present, the problems of complex operation, untimely operation, inaccurate positioning and the like exist in the processing of interphase short circuit faults of a power supply system, and the power supply quality is influenced. The utility model patent application 202011492758.3 and the utility model patent application 202011453632.5 provide a method for handling an inter-phase short circuit in a power supply system, according to which, when an inter-phase short circuit occurs, a faulty phase is maintained to be conducted and the remaining faulty phases are tripped, then the other faulty phase is grounded, a live phase is grounded to form a closed loop with the two faulty phases connected through the short circuit and generate a current or a current pulse, and then the current duration or the current pulse number is detected by a controlled switch and tripped to remove the fault. At present, rural power grids, urban power grids and small power systems mainly use ZW20-12 type outdoor high-voltage vacuum circuit breakers to switch on and off load currents, overload currents, short-circuit currents and the like. The circuit breaker can only open or close three phases at the same time, cannot realize independent on-off operation of each phase, and cannot realize the operation of maintaining the conduction of one fault phase and tripping off other fault phases when the interphase short circuit occurs, and then connecting the other fault phase with the ground or a common lead, so that the interphase short circuit fault is not convenient to process. How to reform transform this current power supply system to the interphase short circuit problem is the problem that expects to solve to convenient the handling.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for assisting in processing interphase short circuit, which can realize the conduction of one fault phase and the grounding of the other fault phase under the condition that the conventional three-phase circuit breaker cuts off a three-phase circuit, and is beneficial to the reconstruction of the conventional circuit so as to create conditions for processing the interphase short circuit fault.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a device for auxiliary treatment of interphase short circuit comprises four switches, wherein a first switch and a second switch are respectively connected with a first phase and a second phase of a three-phase circuit breaker in parallel, a third switch is connected between a third phase lower port of the three-phase circuit breaker and the ground, and a fourth switch is connected between the second phase lower port of the three-phase circuit breaker and the ground; when the three-phase circuit breaker cuts off a three-phase line, the first switch can be kept conductive after being closed, the third switch or the fourth switch can be connected with the corresponding phase to the ground after being closed, or when the three-phase circuit breaker cuts off the three-phase line, the second switch is closed to be kept conductive, and the third switch is closed to be connected with the third phase to the ground.

Preferably, the four switches are arranged in the switch box, five cabinet penetrating sleeves are arranged at the top of the switch box and distributed into two lines, two or three cabinet penetrating sleeves are arranged in the first line, three or two cabinet penetrating sleeves are arranged in the second line, and the distance between any cabinet penetrating sleeve and the adjacent cabinet penetrating sleeve in the same line or the other line is not less than 300 mm.

The utility model has the beneficial effects that: through setting up four switches, when taking place alternate short circuit, can realize that a trouble looks switches on and another trouble looks ground connection after three-phase circuit breaker cuts off the three-phase line, realize the transformation upgrading to current power supply system under the condition that does not change original three-phase circuit breaker to can better handle alternate short circuit fault, have with low costs, the advantage of easy popularization.

Drawings

FIG. 1 is a schematic view of the structure of the present invention

FIG. 2 is a schematic wiring diagram;

fig. 3 is a schematic diagram of the cabinet bushing arrangement.

Detailed Description

The utility model will be further illustrated by the following specific embodiments in conjunction with the accompanying drawings:

as shown in fig. 1 and 2, the power supply system has a power supply and a bus, wherein a plurality of groups of ABC three-phase outgoing lines are branched from the bus, and a three-phase breaker 100 is arranged on the outgoing lines to control whether to supply power to the line or a part of the area on the line. The utility model is arranged near a three-phase circuit breaker 100 and comprises a box body 1 and four switches, namely a first switch 2, a second switch 4, a third switch 3 and a fourth switch 5. Be equipped with five at the top of box 1 and wear the cabinet sleeve pipe, a looks inlet wire pipe 11, a looks outlet wire pipe 12, C looks inlet wire pipe 13, C looks outlet wire pipe 14, B looks inlet wire pipe 15 promptly, each intraductal corresponding binding post that is equipped with (binding post is located the part outside box 1 and is used for being connected with three-phase circuit breaker 100, binding post be located box 1 the part be used for with four switch connection), still be equipped with ground terminal 16 in the box, ground terminal 16 is connected with the earth. During wiring, a static contact of the first switch 2 is connected with a wiring terminal in the A-phase wire inlet pipe 11, a movable contact of the first switch 2 is connected with a wiring terminal in the A-phase wire outlet pipe 12, and then the two wiring terminals are connected with an upper opening and a lower opening of the A-phase of the three-phase circuit breaker in parallel outside the box body 1, so that after the three-phase circuit breaker is switched off, the first switch 2 is closed to conduct the A-phase again. The static contact of the third switch 3 is connected with the wiring terminal in the B-phase inlet wire tube 15, the terminal is also connected with the lower port of the B-phase of the three-phase circuit breaker outside the box body 1, and the movable contact of the third switch 3 is connected with the grounding terminal 16, so that when the three-phase circuit breaker cuts off a three-phase circuit, the third switch 3 is closed, and the B-phase can be grounded at the lower port of the three-phase circuit breaker. The static contact of the second switch 4 is connected with the wiring terminal in the C-phase wire inlet pipe 13, the movable contact of the second switch 4 is connected with the wiring terminal in the C-phase wire outlet pipe 14, the wiring terminal in the C-phase wire inlet pipe 13 is connected with the upper opening of the C-phase of the three-phase circuit breaker outside the box body 1, and the wiring terminal in the C-phase wire outlet pipe 14 is connected with the lower opening of the C-phase of the three-phase circuit breaker outside the box body 1, so that after the three-phase circuit breaker cuts off a circuit, the second switch 4 is closed to conduct the C-phase again. The static contact of the fourth switch 5 is connected with the wiring terminal in the C-phase outlet pipe 14, the movable contact of the fourth switch 5 is connected with the grounding terminal 16, and after the three-phase circuit breaker cuts off the three-phase line, the fourth switch 5 can connect the C-phase to the ground at the lower port of the three-phase circuit breaker.

In use, when an interphase short circuit occurs, the three-phase circuit breaker is tripped to cut off a three-phase line, if AB is a fault phase, the first switch 2 conducts the A phase, and the third switch 3 grounds the B phase at the lower port of the three-phase circuit breaker, so that a state that one fault phase is kept conducted and the other fault phase is grounded after being cut off by the three-phase circuit breaker 100 is formed, conditions are created for injection of subsequent current pulses or continuous currents, and the interphase short circuit fault can be processed according to the methods in the utility model patent application 202011492758.3 and the utility model patent application 202011453632.5. If the AC two-phase fault is detected, a is turned on, and the C phase is grounded by the fourth switch 5, whereas if the BC two-phase fault is detected, the C phase is maintained to be turned on, and the B phase is grounded. If ABC three phases fail, the A phase can be maintained to be conducted, and the B phase or the C phase is grounded.

As shown in fig. 3, the five cabinet-through bushings at the top of the switch cabinet 1 are distributed in two rows, the first row has two or three cabinet-through bushings, the second row has three or two cabinet-through bushings, the distance between any cabinet-through bushing and the adjacent cabinet-through bushing in the same row or another row is the same and is not less than 300 mm, and the layout is compact and meets the insulation requirement.

The above embodiments are only a few illustrations of the inventive concept and implementation, not limitations thereof, and the technical solutions without substantial changes are still within the scope of protection under the inventive concept.

Claims

1. The device for auxiliary treatment of the interphase short circuit comprises four switches, and is characterized in that a first switch and a second switch are respectively connected with a first phase and a second phase of a three-phase circuit breaker in parallel, a third switch is connected between a third phase lower port of the three-phase circuit breaker and the ground, and a fourth switch is connected between the second phase lower port of the three-phase circuit breaker and the ground; when the three-phase circuit breaker cuts off a three-phase line, the first switch can be kept conductive after being closed, the third switch or the fourth switch can be connected with the corresponding phase to the ground after being closed, or when the three-phase circuit breaker cuts off the three-phase line, the second switch is closed to be kept conductive, and the third switch is closed to be connected with the third phase to the ground.

2. The device for assisting in treating interphase short-circuits according to claim 1, wherein the four switches are installed in a switch box, five through-cabinet sleeves are arranged at the top of the switch box, the through-cabinet sleeves are distributed in two rows, the first row has two or three through-cabinet sleeves, the second row has three or two through-cabinet sleeves, and the distance between any through-cabinet sleeve and the adjacent through-cabinet sleeve in the same row or the other row is not less than 300 mm.