CN103399184A - Joint junction box convenient for adjusting phase sequence - Google Patents
Joint junction box convenient for adjusting phase sequence Download PDFInfo
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- CN103399184A CN103399184A CN2013103374810A CN201310337481A CN103399184A CN 103399184 A CN103399184 A CN 103399184A CN 2013103374810 A CN2013103374810 A CN 2013103374810A CN 201310337481 A CN201310337481 A CN 201310337481A CN 103399184 A CN103399184 A CN 103399184A
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Abstract
The invention discloses a joint junction box convenient for adjusting a phase sequence, and is applied to high and low voltage metering equipment fields. The joint junction box comprises a box body, a box cover and a circuit board located in the box body. The joint junction box has the improvements that the upper terminal groups of the first and second terminal groups respectively comprise left and right upper voltage terminals and left and right upper current terminals, wherein the upper terminals of the first and second terminal groups are electrically connected in a cross manner, the upper current terminals corresponding to the first and second terminal groups are electrically connected in a cross manner, a change-over switch is arranged between each lower voltage terminal and two upper voltage terminals corresponding to the lower voltage terminal, a change-over switch is arranged between each lower current terminal and two upper current terminals corresponding to the lower current terminal, and the change-over switches are linked through insulative linkage rods. The joint junction box has the beneficial effects that once an anti-phase sequence occurs, the linkage rods are pushed to quickly and safely adjust the phase sequence so as to avoid equipment hidden dangers and unattractive process caused by rewiring or cross junction.
Description
Technical field
The present invention relates to a kind of combined connection box that can conveniently adjust phase sequence, especially be applicable to the working-yard of high pressure for the secondary connection of the measuring apparatus of low pressure.
Background technology
Electric power meter is comprised of to secondary circuit three parts of mutual inductor electric energy meter, mutual inductor (current transformer, voltage transformer (VT)), electric energy meter.The effect of each several part is respectively:
1, the effect of electric energy meter: also being watt-hour meter, is the core of electric power meter, is load consumption or the electric energy that power supply sends of metering.
2, mutual inductor comprises current transformer and voltage transformer (VT).The effect of mutual inductor: lack the effect of third part
(1) enlarge the range of electric energy meter.Voltage transformer (VT) changes high-voltage variable into low-voltage, and current transformer becomes little electric current by large current transformation.
(2) reduced the manufacture specification of instrument.Except direct access electric energy meter, current transformer is all take 5A as main, and voltage transformer (VT) is all take 100V as main.
(3) isolated high voltage, large electric current, guaranteed the safety of personnel and instrument.
3, secondary circuit comprises voltage secondary circuit and electric current secondary loop
Wherein, voltage secondary circuit refers to the potential winding of voltage transformer (VT), electric energy meter and connects the loop that the two wire forms.Electric current secondary loop refers to the current coil of Current Transformer Secondary coil, electric energy meter and connects the loop that the two wire forms.The secondary load of current transformer comprises that secondary connects wire impedance, the impedance of electric energy meter current coil, the contact resistance between terminal etc.
As shown in Figure 1, the circuit board 100 of the combined connection box of prior art is provided with respectively for U, the V of alternating current, first end subgroup, the second terminal group and the 3rd terminal group that the wherein voltage and current of the mutual inductor of a phase in the W three-phase passes through.Described first end subgroup, the second terminal group and the 3rd terminal group are connected with the secondary circuit of U, V, W phase respectively, in Fig. 1, with a, b, c, represent respectively, on circuit board 100, also are provided with in addition the U that passes through for zero line
0.Described first end subgroup, the second terminal group and the 3rd terminal group comprise respectively be arranged at described circuit board bottom for the lower end subgroup that is connected with described mutual inductor be arranged at described circuit board top for electric energy meter, be connected and with the upper end subgroup of the corresponding setting of described lower end subgroup; Each described lower end subgroup includes a voltage lower terminal and three current lower terminals, and described three current lower terminals i.e. the first current lower terminal, the second current lower terminal and the 3rd current lower terminal.Wherein each voltage lower terminal is connected by the voltage terminal in the upper end subgroup of the first brace 11 and its top, makes the voltage circuit connection of secondary circuit; Simultaneously, three current lower terminals are realized three's connection by two the second braces 21, prevent the open circuit of electric current secondary loop.
Electric energy meter is combined wiring by combined connection box is installed with secondary circuit (voltage secondary circuit and electric current secondary loop), in the time of can realizing easily and safely on-the-spot on-load, ammeter is checked and electriferous state under tear table, dress table open, with the economic loss that guarantees in operating process to prevent electric current secondary loop open circuit and voltage secondary circuit short circuit, while to avoid leaving behind on-load switch has a power failure the user to cause.
But the problem that easily occurs negative phase sequence in the associating wiring, below introduce the relevant problem of phase sequence.
Correct phase sequence, one of should be that abc, bca, cab(abc are namely corresponding to U, V, W) three kinds of forms, all uncontrollable factors due to city, rural power grids distribution line and lead-in wire construction thereof, the wiring error that the negative phase sequence of metering secondary often occurs, be that one of acb, bac or tri-kinds of forms of cba have appearred in phase sequence, although negative phase sequence does not affect the normal operation of secondary circuit, but error and mistake appear in the reactive measurement that can make electric energy meter, and then affect the power examination in electricity charge calculating, the electricity charge of electric company are reclaimed and caused damage.
All measurement problems that may bring due to negative phase sequence, must carry out sequence examing when checking and accepting power transmission, for negative phase sequence occurring, generally will the wiring of any two measuring elements exchange at table tail place, and reach the purpose of adjusting into the table phase sequence.But so operation exists following problem and hidden danger:
(1) exchange wiring and must cause wire to intersect, cause the secondary circuit wiring unintelligible.
(2) while working, need to operate combined connection box, increase the accident risk point.
(3) while exchanging wiring, obscuring of electric current, pressure-wire may occur, cause serious consequence.
Summary of the invention
In view of the foregoing defects the prior art has, the problem to be solved in the present invention is, provide a kind of can safety, switch fast the combined connection box of phase sequence, without rewiring, can realize changing the order operation.
For addressing the above problem, the invention provides a kind of combined connection box that can conveniently adjust phase sequence, comprise box body, lid and be positioned at the circuit board of described box body;
Described circuit board is provided with respectively for U, the V of alternating current, first end subgroup, the second terminal group and the 3rd terminal group that the wherein voltage and current of the secondary circuit of a phase in the W three-phase passes through;
Described first end subgroup, the second terminal group and the 3rd terminal group comprise respectively be arranged at described circuit board bottom for the lower end subgroup that is connected with the mutual inductor of described secondary circuit be arranged at described circuit board top for electric energy meter, be connected and with the upper end subgroup of the corresponding setting of described lower end subgroup;
Each described lower end subgroup includes a voltage lower terminal and three current lower terminals, and described three current lower terminals are the first current lower terminal, the second current lower terminal and the 3rd current lower terminal;
Wherein the upper terminal group of first end subgroup, the second terminal group comprises respectively left voltage upper terminal and right voltage upper terminal corresponding with described voltage lower terminal and that be set up in parallel, the upper end subgroup of first end subgroup, the second terminal group also comprise the first corresponding with the first current lower terminal respectively left current upper terminal and the first right current upper terminal, with corresponding the second left current upper terminal of the second current lower terminal and the second right current upper terminal, three left current upper terminal and the three right current upper terminal corresponding with the 3rd current lower terminal;
Between the left voltage upper terminal of described first end subgroup and the right voltage upper terminal of the second terminal group, be electrically connected to, between the right voltage upper terminal of first end subgroup and the left voltage upper terminal of the second terminal group, be electrically connected to;
The first left current upper terminal of described first end subgroup is electrically connected to the first right current upper terminal of described the second terminal group, and the first right current upper terminal of first end subgroup is electrically connected to the first left current upper terminal under described the second terminal group;
The second left current upper terminal of described first end subgroup is electrically connected to the second right current upper terminal of described the second terminal group, and the second right current upper terminal of first end subgroup is electrically connected to the second left current upper terminal under described the second terminal group;
The 3rd left current upper terminal of described first end subgroup is electrically connected to the 3rd right current upper terminal of described the second terminal group, and the 3rd right current upper terminal of first end subgroup is electrically connected to the 3rd left current upper terminal under described the second terminal group;
Between each described voltage lower terminal and the left voltage upper terminal corresponding with it and right voltage upper terminal, be provided with make described voltage lower terminal respectively with the switch of described left voltage upper terminal or the conducting of right voltage upper terminal, between each described current lower terminal and the left current upper terminal corresponding with it and right current upper terminal, be provided with make described current lower terminal respectively with the switch of described left current upper terminal or right current upper terminal conducting, between a plurality of described switches by the gangbar interlock of an insulation.
As preferably, described switch comprises conducting strip and the driving lever that described conducting strip is connected with described gangbar; One end of described conducting strip is rotationally connected with on described voltage lower terminal or described current lower terminal, and the other end is left-right rotation under the effect of described driving lever.
As preferably, described gangbar is positioned at the outside of described lid, on described lid, offers the chute that the described driving lever of a plurality of confessions slides.
As preferably, the distance between described left voltage upper terminal and right voltage upper terminal and between left current upper terminal and right current upper terminal is all more than or equal to 4cm.
As preferably, the both sides of described left voltage upper terminal, right voltage upper terminal, the first left current upper terminal, the second left current upper terminal, the 3rd left current upper terminal, the first right current upper terminal, the second right current upper terminal, the 3rd right current upper terminal and voltage lower terminal, current lower terminal are equipped with insulating spacer.
As preferably, the material of described box body, lid is the PC plastics.
As preferably, the material of described conducting strip is copper.
The combined connection box that can conveniently adjust phase sequence of the present invention has following beneficial effect: when the on-the-spot in a single day appearance of power transmission slips up due to the secondary circuit wiring negative phase sequence that causes, can adjust quickly and safely phase sequence by promoting gangbar, avoid rewiring or improved cross connect and the hidden trouble of equipment and the technique that cause are not attractive in appearance.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of the combined connection box of prior art.
Fig. 2 is the schematic diagram that can conveniently adjust the combined connection box of phase sequence of one embodiment of the present of invention.
Fig. 3 stirs the schematic diagram that the gangbar in Fig. 2 is carried out the phase sequence adjustment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but not as a limitation of the invention.
The combined connection box that can conveniently adjust phase sequence of one embodiment of the present of invention, comprise box body, lid and be positioned at the circuit board of described box body;
As shown in Figure 2, described circuit board 100 is provided with respectively for U, the V of alternating current, first end subgroup, the second terminal group and the 3rd terminal group that the wherein voltage and current of the secondary circuit of a phase in the W three-phase passes through; Described first end subgroup, the second terminal group and the 3rd terminal group comprise respectively the lower end subgroup that is connected for the mutual inductor with described secondary circuit (comprising voltage transformer (VT) or current transformer) that is arranged at described circuit board bottom be arranged at described circuit board top for electric energy meter, be connected and with the upper end subgroup of the corresponding setting of described lower end subgroup; Each described lower end subgroup includes a voltage lower terminal and three current lower terminals, and described three current lower terminals i.e. the first current lower terminal, the second current lower terminal and the 3rd current lower terminal.Above technical characterictic and prior art are same or similar, repeat no more.
As shown in Figure 2, improvement of the present invention is, by the upper terminal in the upper end subgroup of first end subgroup, the second terminal group, is no matter that voltage upper terminal or current upper terminal all are set to two arranged side by side.that is: first end subgroup, the upper terminal group of the second terminal group comprises respectively left voltage upper terminal and right voltage upper terminal corresponding with described voltage lower terminal and that be set up in parallel, described first end subgroup, the upper end subgroup of the second terminal group also comprises and the left current upper terminal and the right current upper terminal that are set up in parallel corresponding with current lower terminal respectively, namely the first current lower terminal is corresponding with the first left current upper terminal and the first right current upper terminal, the second current lower terminal is corresponding with the second left current upper terminal and the second right current upper terminal, the 3rd current lower terminal is corresponding with the 3rd left current upper terminal and the 3rd right current upper terminal.Wherein the first end subgroup is corresponding to a phase voltage Ua and a phase current Ia(Ia '), the second terminal group is corresponding to b phase voltage Ub and b phase current Ib(Ib ').
As shown in Figure 2, about the annexation between voltage terminal: between the left voltage upper terminal of first end subgroup and the right voltage upper terminal of the second terminal group, be electrically connected to, between the right voltage upper terminal of first end subgroup and the left voltage upper terminal of the second terminal group, be electrically connected to.
Continuation is with reference to Fig. 2, about the annexation between current terminal: the first left current upper terminal of first end subgroup is electrically connected to the first right current upper terminal of the second terminal group, and the first right current upper terminal of first end subgroup is electrically connected to the first left current upper terminal of the second terminal group; The second left current upper terminal of first end subgroup is electrically connected to the second right current upper terminal of the second terminal group, and the second right current upper terminal of first end subgroup is electrically connected to the second left current upper terminal of the second terminal group; The 3rd left current upper terminal of first end subgroup is electrically connected to the 3rd right current upper terminal of the second terminal group, and the 3rd right current upper terminal of first end subgroup is electrically connected to the 3rd left current upper terminal of the second terminal group.Connection and the connection between current terminal between above voltage terminal can connect by P.e.c., do not use wire, namely guarantee neat, the standard at wiring scene, prevent again the problems such as the wiring that may occur is not firm, and reduce wire and take up space.
In order to realize the phase sequence adjustment, please refer to Fig. 2 and Fig. 3, between each voltage lower terminal and the left voltage upper terminal corresponding with it and right voltage upper terminal, be provided with make the voltage lower terminal respectively with the switch of left voltage upper terminal or the conducting of right voltage upper terminal, between each current lower terminal and the left current upper terminal corresponding with it and right current upper terminal, be provided with make current lower terminal respectively with the switch of left current upper terminal or right current upper terminal conducting, between a plurality of switches by gangbar 3 interlocks of an insulation.Because Fig. 2 is circuit theory diagrams, therefore switch only uses switch symbols to replace, and only shows conducting strip 4, gangbar 3 is actually the relation parallel with circuit board 100, therefore gangbar 3 adopts the dotted line frame to replace.
State as shown in Figure 2 is the positive phase sequence state, and the lower end that the arrow in figure represents is that end of incoming cables is input end, and upper end is that leading-out terminal is output terminal.Each voltage lower terminal all corresponding with it left voltage upper terminal connects, and all left current upper terminal connections corresponding with it of each current lower terminal, if state shown in Figure 2 is positive phase sequence, needn't adjust.It is the phase sequence that input end and output terminal are abc.
If the situation of negative phase sequence occurs, as shown in Figure 3, namely the input end of a phase is connected with the b of the inductor of secondary circuit, namely in the phase sequence of the input end of circuit board 100, become the order of bac, under state shown in Figure 2, at output terminal, also should be the phase sequence of bac, be the state of negative phase sequence.As long as stir gangbar 3 to the right, be state shown in Figure 3, all switches are converted to the upper terminal conducting with its right side from the upper terminal conducting with its left side: each the voltage lower terminal all right voltage upper terminal corresponding with it is connected, all right current upper terminal connections corresponding with it of each current lower terminal.Due to the above-mentioned annexation that exists between the upper voltage terminal of first end subgroup in the present invention and the second terminal group and upper current terminal, when the switch transition switch, just the upper end subgroup corresponding connection of the lower end subgroup of first end subgroup with the second terminal group, simultaneously the upper end subgroup corresponding connection of the lower end subgroup of the second terminal group with the first end subgroup.The b phase voltage of the lower end subgroup input of first end subgroup and electric current are just connected by upper end subgroup and the electric energy meter of the second terminal group, a phase voltage and the electric current of the lower end subgroup input of the second terminal group are just connected by upper end subgroup and the electric energy meter of the second terminal group, the phase sequence of the output terminal of circuit board 100 (upper end) namely is adjusted into the order of abc like this, has namely realized the phase sequence exchange of a phase and b phase.Thereby only need to stir gangbar 3 namely realized phase sequence fast, safety adjusts, both needn't rewiring, avoid the intersection of wiring, also needn't carry out other operation, safe ready to combined connection box.Certainly, if the problem of negative phase sequence under state shown in Figure 3, occurs, only need stir gangbar 3 left and get final product.
As preferred version, although not shown in accompanying drawing, the driving lever that shown in fact switch can comprise conducting strip and incite somebody to action, conducting strip was connected with gangbar 3; One end of described conducting strip is rotationally connected with on voltage lower terminal or current lower terminal, and the other end is left-right rotation under the effect of driving lever, has realized that namely the left and right switching connects.In the present embodiment, the good copper of material selection electric conductivity of conducting strip.
For the ease of operation, gangbar 3 is positioned at the outside of lid, with lid, be arranged in parallel, on lid, offers a plurality of chutes for the driving lever slip, prevents rocking of driving lever and gangbar 3.
As preferred version, in the present embodiment, the distance between left voltage upper terminal and right voltage upper terminal and between left current upper terminal and right current upper terminal, all more than or equal to 4cm, makes between it to keep enough insulation distances.In order to guarantee that further it does not discharge, and is equipped with insulating spacer in the both sides of each described left voltage upper terminal, right voltage upper terminal, the first left current upper terminal, the second left current upper terminal, the 3rd left current upper terminal, the first right current upper terminal, the second right current upper terminal, the 3rd right current upper terminal and voltage lower terminal, current lower terminal.
In order to improve the range of application that can conveniently adjust the combined connection box of phase sequence of the present embodiment, the material of box body, lid is PC (Polycarbonate) plastics, i.e. polycarbonate, and it is good heat-resisting and fire-retardant composite, and has certain rigidity.Wherein the shape of box body, lid can be identical with prior art, therefore repeats no more.
The combined connection box that can conveniently adjust phase sequence by above description the present embodiment is to transform and form on the technical foundation of existing combined connection box, when the on-the-spot in a single day appearance of power transmission slips up due to the secondary circuit wiring negative phase sequence that causes, can adjust quickly and safely phase sequence, avoid rewiring or improved cross connect and the hidden trouble of equipment and the technique that cause are not attractive in appearance.And the problems such as technique point not up to standard, dangerous of having avoided traditional adjustment phase sequence method to bring, can also shorten the engineering time, can be widely used in high and low pressure metering outfit scene.
In addition, with reference to Fig. 2, according to the application's technology instruction; those skilled in the art can also do suitable distortion on the basis of the present embodiment; for example, the input end of circuit board shown in Figure 2 and output terminal are exchanged, this also should be considered as protection scope of the present invention.
Certainly, the above is the preferred embodiment of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (7)
1. can conveniently adjust the combined connection box of phase sequence, comprise box body, lid and be positioned at the circuit board of described box body;
Described circuit board is provided with respectively for U, the V of alternating current, first end subgroup, the second terminal group and the 3rd terminal group that the wherein voltage and current of the secondary circuit of a phase in the W three-phase passes through;
Described first end subgroup, the second terminal group and the 3rd terminal group comprise respectively be arranged at described circuit board bottom for the lower end subgroup that is connected with the mutual inductor of described secondary circuit be arranged at described circuit board top for electric energy meter, be connected and with the upper end subgroup of the corresponding setting of described lower end subgroup;
Each described lower end subgroup includes a voltage lower terminal and three current lower terminals, and described three current lower terminals are the first current lower terminal, the second current lower terminal and the 3rd current lower terminal;
It is characterized in that,
Wherein the upper terminal group of first end subgroup, the second terminal group comprises respectively left voltage upper terminal and right voltage upper terminal corresponding with described voltage lower terminal and that be set up in parallel, the upper end subgroup of first end subgroup, the second terminal group also comprise the first corresponding with the first current lower terminal respectively left current upper terminal and the first right current upper terminal, with corresponding the second left current upper terminal of the second current lower terminal and the second right current upper terminal, three left current upper terminal and the three right current upper terminal corresponding with the 3rd current lower terminal;
Between the left voltage upper terminal of described first end subgroup and the right voltage upper terminal of the second terminal group, be electrically connected to, between the right voltage upper terminal of first end subgroup and the left voltage upper terminal of the second terminal group, be electrically connected to;
The first left current upper terminal of described first end subgroup is electrically connected to the first right current upper terminal of described the second terminal group, and the first right current upper terminal of first end subgroup is electrically connected to the first left current upper terminal under described the second terminal group;
The second left current upper terminal of described first end subgroup is electrically connected to the second right current upper terminal of described the second terminal group, and the second right current upper terminal of first end subgroup is electrically connected to the second left current upper terminal under described the second terminal group;
The 3rd left current upper terminal of described first end subgroup is electrically connected to the 3rd right current upper terminal of described the second terminal group, and the 3rd right current upper terminal of first end subgroup is electrically connected to the 3rd left current upper terminal under described the second terminal group;
Between each described voltage lower terminal and the left voltage upper terminal corresponding with it and right voltage upper terminal, be provided with make described voltage lower terminal respectively with the switch of described left voltage upper terminal or the conducting of right voltage upper terminal, between each described current lower terminal and the left current upper terminal corresponding with it and right current upper terminal, be provided with make described current lower terminal respectively with the switch of described left current upper terminal or right current upper terminal conducting, between a plurality of described switches by the gangbar interlock of an insulation.
2. the combined connection box that can conveniently adjust phase sequence as claimed in claim 1, is characterized in that, described switch comprises conducting strip and the driving lever that described conducting strip is connected with described gangbar; One end of described conducting strip is rotationally connected with on described voltage lower terminal or described current lower terminal, and the other end is left-right rotation under the effect of described driving lever.
3. the combined connection box that can conveniently adjust phase sequence as claimed in claim 2, is characterized in that, described gangbar is positioned at the outside of described lid, on described lid, offers the chute that the described driving lever of a plurality of confessions slides.
4. the combined connection box that can conveniently adjust phase sequence as claimed in claim 1 or 2, is characterized in that, the distance between described left voltage upper terminal and right voltage upper terminal and between left current upper terminal and right current upper terminal is all more than or equal to 4cm.
5. the combined connection box that can conveniently adjust phase sequence as claimed in claim 1, it is characterized in that, the both sides of described left voltage upper terminal, right voltage upper terminal, the first left current upper terminal, the second left current upper terminal, the 3rd left current upper terminal, the first right current upper terminal, the second right current upper terminal, the 3rd right current upper terminal and voltage lower terminal, current lower terminal are equipped with insulating spacer.
6. the combined connection box that can conveniently adjust phase sequence as claimed in claim 1, is characterized in that, the material of described box body, lid is the PC plastics.
7. the combined connection box that can conveniently adjust phase sequence as claimed in claim 2, is characterized in that, the material of described conducting strip is copper.
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| CN201310337481.0A CN103399184B (en) | 2013-08-05 | 2013-08-05 | Conveniently can adjust the combined connection box of phase sequence |
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| CN201310337481.0A CN103399184B (en) | 2013-08-05 | 2013-08-05 | Conveniently can adjust the combined connection box of phase sequence |
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| CN103399184A true CN103399184A (en) | 2013-11-20 |
| CN103399184B CN103399184B (en) | 2015-08-26 |
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| CN201310337481.0A Active CN103399184B (en) | 2013-08-05 | 2013-08-05 | Conveniently can adjust the combined connection box of phase sequence |
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