Device with rapid switching arc extinction function

Abstract

The utility model discloses a device with a rapid switching arc extinction function. The device comprises a first bus and a second bus which run in parallel, the first bus and the second bus are connected through a bus tie switch; the first bus is connected with a first arc extinguishing cabinet; the second bus is connected with a second arc extinguishing cabinet; buscouple switch locking terminals of the first arc extinguishing cabinet and the second arc extinguishing cabinet are connected with change-over switches, and lines where the change-over switches are located are connected with normally open auxiliary contacts of the buscouple switches; according to the utility model, the switching switch is connected to the bus tie switch locking terminal of the arc suppression cabinet, and the line where the switching switch is located is connected with the bus tie switch, so that the rapid switching of the two arc suppression cabinets can be realized through the switching switch, and the tedious operation process is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to 6-35kV medium voltage power system technical field, especially relates to a device of quick throw -in and -off arc extinction function. BACKGROUND

[0002] In recent years, arc extinction cabinet is widely used in industrial and mining enterprise power grid, and its advantage is that when single-phase grounding fault occurs in power grid, microcomputer arc extinction device can rapidly judge grounding fault nature, and converts arc grounding into stable metallic grounding within two cycles, and current is flowed into reliable grounding net through metallic grounding, arc grounding, step voltage and grounding heat effect caused by arc grounding are avoided, single-phase arc grounding is eliminated and arc grounding overvoltage is effectively limited.

[0003] But some deficiencies are found in the operation process, in the single bus section dual power 6-35kV power supply system, usually two section buses are parallel operation (namely bus tie switch is in the closed position), if each installation is installed one arc extinction cabinet on two section buses, when single-phase grounding fault occurs in power supply system, two arc extinction cabinets will act, thereby the same phase of two section buses is grounded respectively.

[0004] But when single-phase grounding fault in power grid is eliminated, two grounding points caused by two arc extinction cabinets still exist in the system, which can form mutual lockout for two arc extinction cabinets and cannot be restored, which will inevitably cause serious influence on the safety and reliability of power supply system. INVENTION CONTENTS

[0005] The utility model aims at providing a device of quick throw -in and -off arc extinction function, and solves the quick throw -in and -off of arc extinction cabinet under double bus condition.

[0006] The utility model adopts the following technical scheme: a device of quick throw -in and -off arc extinction function, including parallel operation's first bus and second bus;

[0007] The first bus and the second bus are connected through bus tie switch;

[0008] The first bus is connected with first arc extinction cabinet;

[0009] The second bus is connected with second arc extinction cabinet;

[0010] The bus tie switch terminal of first arc extinction cabinet and second arc extinction cabinet is connected with switch, and the switch is connected with the normally open auxiliary contact of bus tie switch on the line.

[0011] Further, the first arc extinction cabinet and the second arc extinction cabinet all include microcomputer arc extinction controller;

[0012] The switch is connected with microcomputer arc extinction controller, and the microcomputer arc extinction controller is connected with the auxiliary contact of current limiting fuse.

[0013] Further, the microcomputer arc-extinguishing controller is connected to the auxiliary contact of the vacuum contactor.

[0014] Further, the first bus is connected with a first control assembly:

[0015] The first control assembly comprises a first knife switch connected with the first bus, the first knife switch being connected with a first overvoltage protector, a first fuse and a first current-limiting fuse respectively;

[0016] The first fuse is further connected with a first voltage transformer;

[0017] The first current-limiting fuse is further connected with a first vacuum contactor.

[0018] Further, the second bus is connected with a second control assembly:

[0019] The second control assembly comprises a second knife switch connected with the second bus, the second knife switch being connected with a second overvoltage protector, a second fuse and a second current-limiting fuse respectively;

[0020] The second fuse is further connected with a second voltage transformer;

[0021] The second current-limiting fuse is further connected with a second vacuum contactor.

[0022] The device has the advantages that: the switching switch is connected to the locking terminal of the bus coupler of the arc-extinguishing cabinet, and the line connected with the switching switch is connected with the bus coupler, so that the switching switch can be used to quickly put into and take out the two arc-extinguishing cabinets, and complicated operation processes are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A principle diagram of the device for quickly putting into and taking out the arc-extinguishing function is provided for the utility model embodiment;

[0024] Figure 2 An arc-extinguishing cabinet control principle diagram is provided for the utility model embodiment.

[0025] Wherein: 10. the first bus; 20. the second bus;

[0026] 30. the first control assembly; 31. the first knife switch; 32. the first overvoltage protector; 33. the first fuse; 34. the first voltage transformer; 35. the first current-limiting fuse; 36. the first vacuum contactor;

[0027] 40. the second control assembly; 41. the second knife switch; 42. the second overvoltage protector; 44. the second fuse; 44. the second voltage transformer; 45. the second current-limiting fuse; 46. the second vacuum contactor;

[0028] 50. the bus coupler. DETAILED DESCRIPTION

[0029] The utility model will be described in detail below in combination with the drawings and specific embodiments.

[0030] In view of the above problems of the double bus system, it is usually necessary to carry out power-off operation on the PT (voltage transformer) to convert the PT into a maintenance state, remove (put on) the current limiting fuse, and then exit (put in) the arc suppression function. When removing the current limiting fuse of the arc suppression cabinet, a work ticket needs to be handled, the PT needs to be operated by switching, and the operation takes a long time (about 30 minutes), which delays the fault handling, and the PT switching operation is carried out in the grounded state, which has unsafe factors and a large risk coefficient.

[0031] The utility model discloses a device of quick putting and taking arc suppression function, as shown in Figure 1 The first bus 10 and the second bus 20 are connected through a bus tie switch 50; the first bus 10 is connected with a first arc suppression cabinet; the second bus 20 is connected with a second arc suppression cabinet; the bus tie switch of the first arc suppression cabinet and the second arc suppression cabinet is connected with a switching switch, and the switching switch is connected with the normally open auxiliary contact of the bus tie switch 50.

[0032] The utility model discloses a device of quick putting and taking arc suppression function, as shown in

[0033] The first arc suppression cabinet and the second arc suppression cabinet both include a microcomputer arc suppression controller; the switching switch is connected with the microcomputer arc suppression controller, and the microcomputer arc suppression controller is connected with the auxiliary contact of the current limiting fuse. Through the setting, the switching switch only cuts off the conversion function of the arc suppression cabinet, and does not affect the alarm function of the arc suppression cabinet.

[0034] The microcomputer arc suppression controller is connected with the auxiliary contact of the vacuum contactor. Through the connection with the auxiliary contact of the vacuum contactor, the arc suppression function can be realized.

[0035] The first bus 10 is connected with a first control assembly 30: the first control assembly 30 includes a first knife switch 31 connected with the first bus 10, and the first knife switch 31 is connected with a first overvoltage protector 32, a first fuse 33 and a first current limiting fuse 35 respectively; the first fuse 33 is further connected with a first voltage transformer 34; and the first current limiting fuse 35 is further connected with a first vacuum contactor 36.

[0036] The second busbar 20 is connected to a second control component 40. The second control component 40 includes a second disconnect switch 41 connected to the second busbar 20. The second disconnect switch 41 is connected to a second overvoltage protector 42, a second fuse 43, and a second current limiting fuse 45. The second fuse 43 is also connected to a second voltage transformer 44. The second current limiting fuse 45 is also connected to a second vacuum contactor 46.

[0037] In this utility model, a current-limiting fuse, a vacuum contactor, and a microcomputer arc-suppression controller are added to a voltage transformer to form an arc-suppression cabinet.

[0038] In summary, this device can quickly activate and deactivate the arc suppression device, effectively shortening the fault handling time, avoiding electrical short circuit accidents caused by arc overvoltage, and there are no safety risks during operation.

[0039] like Figure 2 As shown, JZa represents the A-phase auxiliary contact of the vacuum contactor, JZb represents the B-phase auxiliary contact of the vacuum contactor, JZc represents the C-phase auxiliary contact of the vacuum contactor, YTM represents the microcomputer arc suppression controller, SA represents the switching switch, DL represents the auxiliary contact of the bus tie switch, FUa represents the A-phase current limiting fuse, FUb represents the B-phase current limiting fuse, FUc represents the C-phase current limiting fuse, and SB represents the external reset switch.

[0040] The switching switch SA and the auxiliary contact DL (normally open) of the bus tie switch 50 are connected in series to the vacuum contactor closing circuit inside the arc suppression cabinet. The two ends of this circuit are respectively connected to the +KM terminal of the positive DC bus and the YTM (i.e., the microcomputer arc suppression controller). The aforementioned switching device is installed on the arc suppression cabinet of the dual power supply 6-35kV section bus in the single bus section.

[0041] When two busbars are running in parallel, manually switch one set of changeover switches SA to the closed position (arc suppression device out of operation) and the other set of changeover switches SA to the open position (arc suppression device into operation).

[0042] When a single-phase ground fault occurs in the power supply system, the arc suppression device in operation will activate and ground the faulty phase of a section of the busbar, while another set of arc suppression devices will only issue a grounding alarm signal. After the fault is cleared, there will be only one grounding point in the system, which can quickly restore the signal and bring the system back to normal.

[0043] When the two busbars are running in separate configurations, both sets of switching switches SA are manually switched to the open position (both sets of arc suppression cabinets are used as arc suppression devices). The two busbars represent two independent systems, and there will be no situation where the two arc suppression cabinets are mutually locked.

[0044] The utility model discloses a switch is installed on high -voltage PT switch cabinet, simple structure, when the single -phase ground fault of power grid occurs through the breaking of switch, solved the repeated use of arc -extinguishing device in the same system, leads signal to be unable to return to normal, greatly shorten the fault processing time, avoided the arc light short circuit accident, makes the system fast recovery normal.

[0045] The switch is installed on high -voltage PT switch cabinet, and wiring is simple, and the operation mode is switched flexibly, and when the single -phase ground fault of power grid occurs, can be fast through the breaking of switch, solved the arc -extinguishing device signal and cannot return to normal, greatly shorten the fault processing time, avoided the arc light short circuit accident.

Claims

1. A device for fast switching on and off arc extinction function, characterized in that, The first busbar (10) and the second busbar (20) are connected through a bus tie switch (50); The first busbar (10) is connected with a first arc-extinguishing cabinet; The second busbar (20) is connected with a second arc-extinguishing cabinet; The bus tie switch locking terminals of the first arc-extinguishing cabinet and the second arc-extinguishing cabinet are connected with a switching switch, and the switching switch is connected with a normally open auxiliary contact of the bus tie switch (50). The first arc-extinguishing cabinet and the second arc-extinguishing cabinet both comprise a microcomputer arc-extinguishing controller; 2. A device for quick switching on and off of arc extinction function as claimed in claim 1 wherein, The switching switch is connected with the microcomputer arc-extinguishing controller, and the microcomputer arc-extinguishing controller is connected with an auxiliary contact of a current limiting fuse.

3. The device of claim 2, wherein, The microcomputer arc-extinguishing controller is connected with an auxiliary contact of a vacuum contactor. The first busbar (10) is connected with a first control assembly (30); 4. A device for quick switching on and off of arc extinction function as claimed in claim 2 or 3 wherein, The first control assembly (30) comprises a first knife switch (31) connected with the first busbar (10), and the first knife switch (31) is connected with a first overvoltage protector (32), a first fuse (33) and a first current limiting fuse (35) respectively; The first fuse (33) is further connected with a first voltage transformer (34); The first current limiting fuse (35) is further connected with a first vacuum contactor (36). The second busbar (20) is connected with a second control assembly (40); 5. A device for quick switching on and off of arc extinction function as claimed in claim 2 or 3 wherein, The second control assembly (40) comprises a second knife switch (41) connected with the second busbar (20), and the second knife switch (41) is connected with a second overvoltage protector (42), a second fuse (43) and a second current limiting fuse (45) respectively; The second fuse (43) is further connected with a second voltage transformer (44); The second current limiting fuse (45) is further connected with a second vacuum contactor (46). ​

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