CN205178277U - Three -phase bus in cubical switchboard - Google Patents
Three -phase bus in cubical switchboard Download PDFInfo
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- CN205178277U CN205178277U CN201520284503.6U CN201520284503U CN205178277U CN 205178277 U CN205178277 U CN 205178277U CN 201520284503 U CN201520284503 U CN 201520284503U CN 205178277 U CN205178277 U CN 205178277U
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Abstract
The utility model relates to a three -phase bus in cubical switchboard, this three -phase bus are conventional rectangle one side or both sides increase an at least strengthening rib, this strengthening rib is rectangle, arc or trapezoidal, and the preparation material of three -phase bus can be for copper, aluminium, aluminum alloy or copper clad aluminium. The three -phase bus is for being " article style of calligraphy afterwards ", " preceding article style of calligraphy " or " notch cuttype " staggered arrangement in the cubical switchboard. The utility model discloses reduced electronic repulsion to the generating line move, heat stability's influence, effectively improved move between the generating line, heat stability, to power equipment's safety, the meaning that the reliability service has very important. Use special -shaped aluminium to arrange the back sectional area and improve one time, cost reduction 70%, sectional area, girth, coefficient of heat transfer, weight and cost each item parameter all are superior to the copper bar of present use, have extensive application prospect.
Description
Technical field
The present invention relates to a kind of three-phase bus be used in low-tension switch cabinet, particularly relate to a kind of structure of bus and the layout type in low voltage switchgear.
Background technology
At present, electric energy has become main energy sources and the power of modern society and mankind's activity, and the task of power supply is reasonably supply as required and distribute electric energy, therefore, just must reach the basic demand of safety, reliable, high-quality and economy.Electric power system be short-circuited fault time its impedance circuit when being significantly smaller than normal operation impedance, and produce higher than the normal operating current tens doubly even short circuit current of hundreds of times, its numerical value can reach several ten thousand and even hundreds of thousands ampere, namely powerful short circuit current is had by power consumption equipment and conductor, and produce powerful electric power and act on power consumption equipment and conductor, great threat is had, the dynamo-electric effect of Here it is short circuit current, i.e. the mechanism that produces of electric power to the safe operation of power consumption equipment and conductor.
Electric power system is once short circuit, then especially short-circuit impact electric current is very large for short circuit current, powerful electric power (interaction force between the current－carrying conductor be arranged in parallel be proportional to short circuit current square) is produced between adjacent current－carrying conductor, its result will make that equipment conductor deforms, unstability, make electric equipment and current-carrying part suffer badly damaged and cannot run even most probably.How rational in low-tension switch cabinet, arrange bus, be main feature of the present invention.
(control appliance is comprised) and transmits the carrier of main circuit current in low-voltage complete switch equipment, the general bus all adopting copper material, and prior art does not consider (see accompanying drawing 1) electrodynamical stability problem on busbar layout type or take certain measure for solving electrodynamical stability problem (see accompanying drawing 3).In accompanying drawing 1,1 is the laggard ordinary rectangular bus of three-phase, for three-phase be arranged in parallel, outer step down side of above receiving at the counter, under connect 5 low-voltage frame circuit breaker end opening terminals.2 is three-phase main bus bar bus fixed frame arranged in parallel, is fixed on switch cabinet body 4 by 8 main bus bar frame mounting rails.3 is three-phase main bus bar arranged in parallel, by 2 bus fixed frame and low voltage switchgear bodies, installs fixing.7 is distribution bus in three cabinets paralleled, and its upper end is connected with 3 main bus bars, and lower end is connected with the terminal suitable for reading of 5 frame circuit breakers.5 frame circuit breakers are fixed on the cabinet of low-tension switch cabinet by mounting panel.6 current transformers adopt core through type to be set on 1 bus.9 is three-phase bus clamping plate mounting rails, and it and 4 low-voltage switch cabinets are mounted with.10 is three-phase bus cleat insulators, and fixing bus is assembled together with 9.
Disclose a kind of copper bar installation structure of circuit breaker incoming line cabinet in patent 201420648801.4 " copper bar installation structure of circuit breaker incoming line cabinet ", see accompanying drawing 2.Comprise parallel fixing some main busbar on the insulator, main row is entered in side, row is propped up in upper end, bus-bar, lower end prop up row, also comprise two bus brace summers, main busbar props up to arrange by bus-bar and lower end and overlaps, side is entered main row overlap joint upper end and is propped up row, upper end is propped up ranking and is propped up directly over row in lower end, upper end is propped up row and is fixed in incoming line cabinet cabinet by the first bus brace summer, and lower end is propped up row and is fixed on incoming line cabinet cabinet both sides by the second bus brace summer.Can find out that bus is not all staggeredly arranged.
Disclose a kind of incoming line cabinet busbar erecting device and the incoming line cabinet with this device in patent 201420615860.1 " installation of incoming line cabinet busbar and the incoming line cabinet with this device ", see accompanying drawing 3.Comprise lead-in circuit breaker end opening vertical row, inlet wire horizontal busbar, lead-in circuit breaker vertical row suitable for reading, outlet horizontal busbar, three collets and insulated bolt; First collets, inlet wire horizontal busbar, lead-in circuit breaker vertical row suitable for reading and the 3rd collets compact siro spinning technology successively, and adopt two insulated bolts to fix.In this patent, the homophase centre of inlet wire and outlet is added insulating barrier, through insulated bolt in the connecting hole on busbar, the both sides of bus bar use collets, for solving the problem of electronic ability between bus.
Prior art Problems existing and shortcoming
What all adopt in two patents introduced in above background technology is copper busbar, and on busbar layout type, do not consider that dynamic, thermal stability that electrodynamic repulsion force causes reduce problem, or have employed certain measure raising dynamic thermal stability, but ineffective head it off, as patent 201420615860.1.Current existing busbar layout type Problems existing and shortcoming as follows:
(1) during bus arrangement, each position is layout arranged in parallel, and do not adopt an effective measure and solve electric power problem, therefore the anti-alternate electric power of three-phase horizontal bus is poor, causes dynamic, poor heat stability between busbar.Also there is larger impact for temperature rise heat radiation simultaneously, be unfavorable for the operating mode of switch cubicle long-time running.
(2) busbar layout type causes switch cabinet body width comparatively large, and floor space is large, and cost is high.
(3) the unreasonable non-ferrous metal that causes of layout type is wasted.
Domestic being proposed again adopts the using standard of Copper-Aluminum compound bus in low voltage complete set in the recent period, but does not have the application report adopting aluminum and its alloy bus in actual applications.In current low tension switch complete set of equipments, it is as follows why aluminum bus applies few basic reason:
1) conductance contrast copper busbar difference about about 30%, needs the sectional area increasing bus under identical ampacity;
2) the mechanical property ratio copper busbar of aluminium busbar is also mutually far short of what is expected, anti-dynamic, thermally-stabilised ability.
Although national standard has the standard about aluminum and its alloy bus, just specify there is not the precedent that special-shaped bus is applied in practice for rectangular bus bar.Also there are the report of applying in low-tension switch cabinet about aluminium busbar in more external companies, but have no the example of special-shaped bus application.
Summary of the invention
The present invention proposes a kind of three-phase bus be used in low-tension switch cabinet, the arranged mode of three-phase bus spatial intersecting in low-tension switch cabinet, effectively improve that bus is dynamic, thermal stability.Simultaneously, on the basis of existing rectangular bus bar, increase to devise and improve bus opposing at reinforcement that is dynamic, thermally-stabilised Down Highway deformability, improve the bending resistant section modulus of bus, reach the mechanical performance strengthening bus, also can increase sectional area and the girth of bus, this measure can have raising in various degree to anti-dynamic, the thermally-stabilised ability and the temperature rise of reduction equipment in long-term work improving bus simultaneously.
In order to realize object of the present invention, following technical scheme is proposed:
Be used in the three-phase bus in low-tension switch cabinet, described three-phase bus interlaced arrangement in switch cubicle.
Described three-phase bus is that " rear Chinese character pin-shaped ", " front Chinese character pin-shaped " or " notch cuttype " spatial intersecting are arranged in switch cabinet body.
Described three-phase bus shape is conventional rectangular.
Described three-phase bus is on rectangular bus bar, increase by least one muscle, and the shape of described muscle can be rectangle, circular arc or trapezoidal.
The material of described three-phase bus is copper, aluminium, aluminium alloy or copper cover aluminum.
Busbar in low-tension switch cabinet of the present invention adopts spatial intersecting layout type, adopts Novel special-shaped aluminium busbar simultaneously, is applied in low-voltage complete switch equipment, as the substitute of conventional copper bus material.The object of this measure is exactly in order to multiplex to aluminium busbar in voltage whole set switch cabinet.Solve aluminium busbar bottleneck problem in the application.Because China is the country of " the rich aluminium of poor copper ", if aluminum bus is more applied in voltage whole set switch cabinet, utilization for national resources has a very large progradation, has very important meaning for reduction low-voltage complete switch equipment cost simultaneously.
Adopt the beneficial effect of above technical scheme as follows:
(1) reduce that electrodynamic repulsion force moves bus, the impact of thermal stability, effectively improve dynamic, thermal stability between bus, the safety of power equipment, reliability service tool are of great significance.
(2) contrast with the low-tension switch cabinet of this example: (3150A) is for special-shaped bus 2:
As can be seen from above contrast: after using special-shaped aluminium to arrange, sectional area (doubling), girth, coefficient of heat transfer, weight and cost (reducing by 70%) parameters are all better than the copper bar used now, and visible special-shaped aluminium busbar has a wide range of applications.
Accompanying drawing explanation
Fig. 1 is the busbar type of attachment of prior art;
Fig. 2 is the sectional drawing of patent 201420648801.4;
Fig. 3 is the sectional drawing of patent 201420615860.1;
Fig. 4 is place bus vertically horizontal;
Fig. 5 places being staggered of bus vertically;
Fig. 6 keeps flat the horizontal of bus;
Fig. 7 keeps flat being staggered of bus;
Fig. 8 novel busbar type of attachment of the present invention;
Fig. 9 a prior art busbar arrangement end view;
Fig. 9 b is busbar arrangement end view of the present invention;
Figure 10 a prior art busbar arrangement vertical view;
Figure 10 b busbar arrangement vertical view of the present invention;
The horizontal outlet terminal displaced manner of three-phase of Figure 11 a breaker outgoing line busbar arrangement;
The three-phase isosceles triangle outlet terminal displaced manner of Figure 11 b breaker outgoing line busbar arrangement;
Figure 12 prior art standard rectangular bus;
Figure 13 the present invention abnormity rectangular bus bar 1;
Figure 14 the present invention abnormity rectangular bus bar 2;
Figure 15 the present invention abnormity rectangular bus bar 3;
Figure 16 the present invention abnormity rectangular bus bar 4;
Figure 17 the present invention abnormity rectangular bus bar 5;
Figure 18 the present invention abnormity rectangular bus bar 6;
The special-shaped bus 7 of Figure 19 double-sided belt muscle of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.
When selecting all kinds of high-low pressure equipment and conductor in electric power system, according to the feature of normal running conditions (comprising rated voltage, rated current, frequency, drop-out current etc.), short circuit condition (comprising thermally-stabilised, Dynamic stability and the duration of short-circuit etc.), environmental condition (comprising temperature, humidity, height above sea level medium state etc.) and various equipment and conductor, should consider and select.Wherein according to short circuit condition, heat is carried out to electric equipment and conductor, the check of dynamic stability is the vital work selecting electric equipment and conductor, be the design of all kinds of electric equipment and select time a key factor must considering, be also an important step in all kinds of power engineering design.In power engineering design, when selecting most of electric equipment, should first to its heat, dynamic stability in addition calculation check, to guarantee these electric equipments or conductor reliability of operation.
The dynamic stability of electric equipment or conductor refers to and unstability or distortion, not destroyed ability does not occur under short-circuit electromotive force effect, the short circuit dynamic stability verification of bus requires that bus-bar system is within the duration of short-circuit, the effect of the maximum stress produced because of short circuit current can be born, make bus-bar system in the natural frequency of vibration, meet the stable condition of mechanical resonance simultaneously.The thermal stability of electric equipment or conductor refers to the ability of its unlikely distortion, damage under Short circuit current heating effect effect, namely heat-stable entertoxin requires that electric equipment or conductor are under short circuit current effect, within a certain period of time not reason overheated and deform, phenomenon that deliquescing, contact melted etc. damage electrical equipment or conductor, thus ensure electrical equipment and conductor safety, reliablely and stablely work.
Flow through electric current in rectangular bus bar, just can generate an electromagnetic field between them, will electromagnetic force be produced; The direction of electromagnetic force and the sense of current flowing through rectangular bus bar about: simultaneously relevant again with the arrangement mode of rectangular bus bar, be simplify to calculate;
First consider:---when rectangular bus bar is parallel,
---bending or when intersecting electromagnetism force component Hasty omits;
When the length of parallel rectangular bus bar be greater than between them put spacing time, electromagnetic force is seen as along bus length direction and is uniformly distributed, and its size is calculated as follows:
F＝μ
0/2π*i
1 2i
2 2*L/a(N)
In formula: i
1, i
2---the instantaneous value (A) of electric current in rectangular bus bar
L---rectangular bus bar supports the centre-to-centre spacing (m) of fixture
A---the centre-to-centre spacing (m) between rectangular bus bar
μ
0---magnetic constant, permeability of vacuum is 4 π * 10
-7
The calculating of power during three-phase shortcircuit
In low-voltage distribution equipment, be generally the three-phase rectangular bus bar system configuring same centre-to-centre spacing at same plane, during three-phase shortcircuit, the power acted in middle conductor represents with following formula:
In formula: i
p3---the peak value (A) of short circuit current during symmetrical three-phase shortcircuit in rectangular bus bar
A
m---the coverage (m) between rectangular bus bar
Can through finding out by figure, adopt after being staggered, the distance between bus significantly increases, and can effectively reduce the electric power between bus, improves anti-dynamic, the heat-staple ability of bus.
In accompanying drawing 8,1 is the novel bus that " rear Chinese character pin-shaped " spatial intersecting is arranged, the low-pressure side of the outer transformer of upper end connecting cabinet, lower end connects the end opening outlet terminal of 5 frame circuit breakers.Whole bus is fixed on bus clip mounting rail 9 by single-phase insulated bus bar clamp 10 respectively, then is connected and fixed with low voltage switchgear body 4.2 is combined main bus frame, and it is that the main bus bar 3 of three-phase interlaced arrangement is fixed, then is arranged on low voltage switchgear body 4 after locating with main bus bar mounting rail 8.7 be interlaced arrangement cabinet in distribution bus, its upper end connects main bus bar 3.The upper end binding post 5 of lower end connecting frame circuit breaker.Whole bus two Combined three phase bus clips are fixed on switch cabinet body through mounting rail.Frame circuit breaker is fixed on low voltage switchgear body 4 through mounting panel 5.
Contrasted can be found out by Fig. 9, the arrangement of the bus of prior art Fig. 9 a is arranged in parallel, except install current transformer place due to reasons in structure wrong over, the buses at all the other places are level, layout arranged in parallel.And the bus arrangement of Fig. 9 b of the present invention, when all busbar arrangements, all adopt the arrangement of isosceles triangle spatial intersecting, decrease that electric power is dynamic on bus, heat-staple impact.
Overlook comparison diagram by Figure 10 also can contrast and can find out: the arrangement of the bus of prior art Figure 10 a is level, arranged in parallel, and the arrangement of the bus of Figure 10 b of the present invention, all adopt isosceles triangle to be staggered.With the change of busbar arrangement, the special-shaped bus temperature rise of falling in low-tension switch cabinet is had greatly improved space.
As can be seen from Figure 11 a breaker outgoing line busbar arrangement: for the horizontal outlet of circuit breaker three-phase when a plane, mode B phase bus being adopted angle outlet can be adopted, level is avoided in outlet and is staggered front to back, greatly can reduce the impact of alternate electric power on busbar like this, anti-dynamic, the thermally-stabilised ability of bus can be improved.
As can be seen from Figure 11 b breaker outgoing line busbar arrangement: if the outlet method of breaker body is isosceles triangle, then only need stagger before and after outgoing line busbar, the layout that fully staggers can be realized.
Can be found out by above-mentioned analysis, in the present invention, in cabinet, all bus arrangements all adopt the mode of " rear Chinese character pin-shaped " spatial intersecting arrangement, efficiently reduce the impact of electric power on bus-bar system, fairly obvious effect is had to dynamic, the thermal stability that improve bus-bar system, also remarkable result is had to the temperature rise heat radiation of bus, just used Novel special-shaped aluminium bus array, replaced widely used copper bus-bar, had very great meaning to the cost reducing low-tension switch cabinet.
For the shape of bus, conventional in current practical application is rectangle copper or aluminum bus, due in the conductance of aluminum bus and bending strength all lower than copper bus, therefore seldom to apply in practice.Also be that regulation is made to aluminum and its alloy bus rectangular bus bar in standard GB/T/T5585.2.But there is not the standard about special-shaped bus.The present invention is on the basis of original rectangular bus bar, adds reinforcement, and the bending strength both having enhanced bus in turn increases the heat-sinking capability of aluminium busbar.
This sentences 10mm*100mm bus is example: (10mm is bus thickness, and 100mm is bus width) present invention is described:
Figure 12 is the rectangular bus bar of prior art standard, Figure 13-Figure 18 is 6 kinds of special-shaped bus of the present invention, wherein Figure 13 is the special-shaped bus of circular arc 5*5 shape, Figure 14 is the special-shaped bus of circular arc 2.5*10 shape, Figure 15 is the special-shaped bus of trapezoidal 10*5 shape, Figure 16 is the special-shaped bus of trapezoidal 5*10 shape, and Figure 17 is the special-shaped bus of rectangle 10*5 shape, and Figure 18 is the special-shaped bus of rectangle 5*10 shape.Contrast special-shaped bus characteristic parameter data list contrast as calculated as follows:
Can complete conductive carrier with single special-shaped bus for small area analysis grade, the special-shaped bus of available two-sided increase reinforcement, see accompanying drawing 19, its result of use is than the better effects if of one-way reinforced.Connect above occasion at big current with two, owing to there being the bad process of the contact-making surface of muscle, therefore adopt the special-shaped bus of one-way reinforced.
In sum: the temperature rise of bus-bars conductor when short circuit is the function of the duration of short circuit current, hot equivalent short time current and conductor material; On the basis considering the smallest cross-sectional that busbar carrying capacity allows, the mode that being used in rectangular bus bar basis increases reinforcement obtains the intensity and rigidity, increasing heat radiation area that increase special-shaped bus, and the heat resistanceheat resistant stability for raising bus is all good measure; Now bus intensity may reduce slightly, but the fail safe of operation can not be had influence on, moreover all regulation duration of short-circuit is that 1s is as standard value in low-voltage distribution system, with the bus of the bus analogy aluminium material of copper material, consider basic ampacity time consider this point, therefore think thermally-stabilised by.This is also that available aluminum material replaces the feasible part of copper material.Above-described specific embodiment; further detailed description has been carried out to object of the present invention, technical scheme and beneficial effect; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a three-phase bus in switch cubicle, is characterized in that, described three-phase bus is that " rear Chinese character pin-shaped ", " front Chinese character pin-shaped " or " notch cuttype " spatial intersecting are arranged in switch cabinet body; Described three-phase bus is on rectangular bus bar, increase by least one muscle, and the shape of described muscle is rectangle, circular arc or trapezoidal.
2. three-phase bus in switch cubicle as claimed in claim 1, it is characterized in that, the material of described three-phase bus is copper, aluminium, aluminium alloy or copper cover aluminum.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520284503.6U CN205178277U (en) | 2015-05-05 | 2015-05-05 | Three -phase bus in cubical switchboard |
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| CN201520284503.6U CN205178277U (en) | 2015-05-05 | 2015-05-05 | Three -phase bus in cubical switchboard |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111430175A (en) * | 2020-04-02 | 2020-07-17 | 宝鸡同步电器有限公司 | Low-voltage large-current phase selection switch with symmetrical structure |
| CN111725706A (en) * | 2019-03-20 | 2020-09-29 | Abb瑞士股份有限公司 | Bus bar device |
| CN114361954A (en) * | 2020-03-23 | 2022-04-15 | 首瑞（天津）电气设备有限公司 | Low-voltage switch cabinet |
-
2015
- 2015-05-05 CN CN201520284503.6U patent/CN205178277U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111725706A (en) * | 2019-03-20 | 2020-09-29 | Abb瑞士股份有限公司 | Bus bar device |
| CN114361954A (en) * | 2020-03-23 | 2022-04-15 | 首瑞（天津）电气设备有限公司 | Low-voltage switch cabinet |
| CN114361954B (en) * | 2020-03-23 | 2023-08-08 | 首瑞（天津）电气设备有限公司 | Low-voltage switch cabinet |
| CN111430175A (en) * | 2020-04-02 | 2020-07-17 | 宝鸡同步电器有限公司 | Low-voltage large-current phase selection switch with symmetrical structure |
| CN111430175B (en) * | 2020-04-02 | 2022-04-29 | 宝鸡同步电器有限公司 | Low-voltage large-current phase selection switch with symmetrical structure |
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