CN216312669U

CN216312669U - Device for auxiliary processing of interphase short circuit of dual-power-supply system

Info

Publication number: CN216312669U
Application number: CN202122587567.1U
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: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-04-15
Anticipated expiration: 2031-10-27

Abstract

The utility model discloses a device for auxiliary processing of interphase short circuit of a dual-power-supply system, which comprises six 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 and a fourth switch are respectively connected between the upper ports of the third phase and any other phase of the three-phase circuit breaker and the earth or a common lead, and a fifth switch and a sixth switch are respectively connected between the lower ports of the third phase and any other phase of the three-phase circuit breaker and the earth or the common lead. The device can realize the switching on of a fault phase and enable another fault phase to be grounded at the upper port of the switch or the lower port of the switch under the condition that the conventional three-phase circuit breaker cuts off a three-phase circuit, and can be directly used for modifying the conventional circuit so as to create conditions for removing an interphase short-circuit fault for a dual-power supply system.

Description

Device for auxiliary processing of interphase short circuit of dual-power-supply system

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 dual-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. Aiming at the processing method of the interphase short circuit of the dual-power-supply system, the detection loop can be manufactured twice by using the similar method, and the faults are respectively removed from the two sides of the fault point. In order to better maintain the conduction of a fault phase after the inter-phase short circuit of the dual-power supply system and enable the other fault phase to be grounded at the upper port or the lower port of the switch so as to remove the fault from two sides, a simple and quick device for assisting in processing the inter-phase short circuit is urgently needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a device for auxiliary processing of interphase short circuit of a dual-power-supply system, which can realize the conduction of one fault phase and enable the other fault phase to be grounded at the upper port of a switch or the lower port of the switch under the condition that the conventional three-phase circuit breaker cuts off a three-phase circuit.

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

a device for auxiliary processing of interphase short circuit of a dual-power-supply system comprises six 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 and a fourth switch are respectively connected between an upper port of a third phase and any other phase of the three-phase circuit breaker and the ground or a common lead, and a fifth switch and a sixth switch are respectively connected between a lower port of a third phase and any other phase of the three-phase circuit breaker and the ground or the common lead; when the three-phase circuit breaker cuts off a three-phase line, the first switch can be kept conducted after being closed, the second switch can be kept conducted after being closed, and the third switch, the fourth switch, the fifth switch or the sixth switch can be connected with the ground or a common lead through the corresponding phase after being closed.

Preferably, the third switch and the fourth switch are respectively connected between the upper ports of the third phase and the first phase of the three-phase circuit breaker and the ground or the common conductor, and the fifth switch and the sixth switch are respectively connected between the lower ports of the third phase and the second phase of the three-phase circuit breaker and the ground or the common conductor.

Preferably, the six switches are arranged in the switch box, six cabinet penetrating sleeves are arranged at the top of the switch box and distributed into two rows, three cabinet penetrating sleeves are arranged in each row, and the distance between any cabinet penetrating sleeve and the adjacent cabinet penetrating sleeve in the same row or another row is not less than 300 mm.

The utility model has the beneficial effects that: through setting up six switches, when the interphase short circuit takes place, can realize that a trouble looks (first phase or second phase) switches on through closed first switch or second switch after three-phase circuit breaker cuts off the three-phase circuit to through selecting to close one of other four switches and realize making another trouble looks at the upper reaches or the lower mouthful ground connection of switch, utilize this auxiliary device to cooperate current three-phase circuit breaker like this can realize constructing two trouble looks and short-circuit point in the purpose of a detection return circuit, thereby for dual power supply system from both sides excision fault point creation condition. The device can realize the transformation and the upgrade of the existing power supply system under the condition of not changing the original three-phase circuit breaker, thereby better processing the interphase short-circuit fault and having the advantages of low cost and easy popularization.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a wiring schematic of the present invention.

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 includes a power supply 1 and a power supply 2, an ABC three-phase line is provided between the power supply 1 and the power supply 2, a demarcation switch 3 is provided on the three-phase line, and the demarcation switch 3 is in an off state at a normal time. The three-phase circuit breakers are arranged on three-phase lines to serve as the partition switches 100, the section switches 1001 are arranged between the partition switches 100, a protection area (a dotted line frame) is formed by the lines between two adjacent partition switches 100, the partition switches 100 can control whether the power supply 1 or the power supply 2 supplies power to the area, the partition switches 100 need to have the capacity of cutting off short-circuit large current, the section switches 1001 only need to have the capacity of cutting off load current and do not need to have the capacity of cutting off the short-circuit large current, the cost is reduced, after an interphase short-circuit fault occurs, a detection loop comprising a short-circuit point and two fault phase conductors can be manufactured, a current pulse signal is injected into the detection loop, and the section switches can trip according to the preset current pulse number to cut off the fault. The present invention is disposed near each partition switch 100, and includes six switches, i.e., a first switch 4, a second switch 5, a third switch 6, a fourth switch 7, a fifth switch 8, and a sixth switch 9. The six switches are located in the box body 10, six cabinet penetrating sleeves are arranged at the top of the box body 10, namely an A-phase (as a first phase) incoming line pipe 11, an A-phase outgoing line pipe 12, a C-phase (as a second phase) incoming line pipe 13, a C-phase outgoing line pipe 14, a B-phase (as a third phase) incoming line pipe 15 and a B-phase incoming line pipe 16 are arranged in each box, corresponding wiring terminals are arranged in each box (the parts of the wiring terminals located outside the box body 10 are used for being connected with the partition switch 100, the parts of the wiring terminals located in the box body 10 are used for being connected with the six switches), a grounding terminal 16 is further arranged in the box body 10, and the grounding terminal 16 is connected with the ground. During wiring, a fixed contact 401 of the first switch 4 is connected with a wiring terminal in the a-phase wire inlet pipe 11, a movable contact 402 of the first switch 4 is connected with a wiring terminal in the a-phase wire outlet pipe 12, and then the two wiring terminals are connected in parallel with an upper port and a lower port of the a-phase of the partition switch 100 outside the box body 10 (the upper port and the lower port of the breaker switch refer to two ends of a breaker breaking point, generally, one end connected with a power supply is the upper port, the other end is the lower port, and the description is only used for respectively referring to one end of each of the two ends of the breaking point to show the difference), so that when the partition switch 100 is cut off, the first switch 4 is closed to switch on the a-phase again. The fixed contact 501 of the second switch 5 is connected with the connecting terminal in the C-phase incoming line pipe 13, the moving contact 502 of the second switch 5 is connected with the connecting terminal in the C-phase outgoing line pipe 14, the connecting terminal in the C-phase incoming line pipe 13 is connected with the upper port of the C-phase of the zone switch 100 outside the box body 10, and the connecting terminal in the C-phase outgoing line pipe 14 is connected with the lower port of the C-phase of the zone switch 100 outside the box body 10, so that after the zone switch 100 cuts off the line, the second switch 5 is closed to conduct the C-phase again. The fixed contact 601 of the third switch 6 is connected with the wiring terminal in the B-phase upper inlet wire inlet pipe 15, the movable contact 602 of the third switch 6 is connected with the grounding terminal 16, and the wiring terminal in the B-phase upper inlet wire inlet pipe 15 is connected with the B-phase upper inlet of the partition switch 100 outside the box body 10, so that the partition switch 100 can be grounded at the B-phase upper inlet after the third switch 6 is closed. The fixed contact 701 of the fourth switch 7 is connected with the wiring terminal in the phase a wire inlet tube 11 in the box body 10, so as to be connected with the upper opening of the partition switch 100, and the movable contact 702 of the fourth switch 7 is connected with the grounding terminal 16, so that the partition switch 100 can be grounded on the phase a upper opening after the fourth switch 7 is closed. The fixed contact 801 of the fifth switch 8 is connected with the wiring terminal in the B-phase lower inlet pipe 16 in the box body 10, the wiring terminal in the B-phase lower inlet pipe 16 is connected with the B-phase lower inlet of the partition switch 100 outside the box body 10, and the movable contact 802 of the fifth switch is connected with the grounding terminal 16, so that the B-phase lower inlet of the partition switch 100 can be grounded after the fifth switch 8 is closed. The fixed contact 901 of the sixth switch 9 is connected with the connection terminal in the C-phase outlet pipe 14 in the box body 10, and the movable contact 902 of the sixth switch 9 is connected with the grounding terminal 16, so that the partition switch 100 can be grounded at the C-phase lower port after the sixth switch 9 is closed.

The six cabinet penetrating sleeves at the top of the switch box body 10 are distributed into two rows, three cabinet penetrating sleeves are arranged in each row, the distance between any cabinet penetrating sleeve and the adjacent cabinet penetrating sleeve in the same row or the other row is the same and is not less than 300 millimeters, and the layout is compact and meets the insulation requirement.

When the present invention is used, if an interphase short-circuit fault occurs at point F (fig. 2), the sectionalizing switch 100 on the power supply 2 side can be tripped, one faulty phase is turned on, the other faulty phase is grounded, and the sectionalizing switch is turned off by current pulses to remove the fault. Then the demarcation switch 3 is closed, the fault point F is still a short-circuit point relative to the power supply 1, at this time, the partition switch 100 on one side of the power supply 1 is used for tripping, a fault phase is manufactured to be conducted by using the utility model, the other fault phase is grounded, then the current pulse is used for enabling the subsection switch to remove the fault from one side of the power supply 1 again (the grounding terminal 16 can be not grounded but connected with a common lead, a charged phase except the fault phase which is kept to be conducted is also circularly conducted or disconnected with the common lead, so that a detection loop with the current pulse can be manufactured, and the fault is eliminated.

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. A device for auxiliary processing of interphase short circuit of a dual-power-supply system comprises six 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 and a fourth switch are respectively connected between the upper ports of the third phase and any other phases of the three-phase circuit breaker and the earth or a common lead, and a fifth switch and a sixth switch are respectively connected between the lower ports of the third phase and any other phases of the three-phase circuit breaker and the earth or the common lead; when the three-phase circuit breaker cuts off a three-phase line, the first switch can be kept conducted after being closed, the second switch can be kept conducted after being closed, and the third switch, the fourth switch, the fifth switch or the sixth switch can be connected with the ground or a common lead through the corresponding phase after being closed.

2. An arrangement for auxiliary handling of an inter-phase short circuit in a dual power supply system according to claim 1, wherein the third and fourth switches are connected between the upper ports of the third and first phases of the three-phase circuit breaker and the earth or common conductor, respectively, and the fifth and sixth switches are connected between the lower ports of the third and second phases of the three-phase circuit breaker and the earth or common conductor, respectively.

3. The device for auxiliary processing of the interphase short circuit of the dual-power-supply system as recited in claim 1, wherein the six switches are installed in a switch box, six cabinet penetrating sleeves are arranged at the top of the switch box, the cabinet penetrating sleeves are distributed in two rows, each row has three cabinet penetrating sleeves, and the distance between any cabinet penetrating sleeve and the adjacent cabinet penetrating sleeve in the same row or another row is not less than 300 mm.