CN103399184B - Conveniently can adjust the combined connection box of phase sequence - Google Patents

Conveniently can adjust the combined connection box of phase sequence Download PDF

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Publication number
CN103399184B
CN103399184B CN201310337481.0A CN201310337481A CN103399184B CN 103399184 B CN103399184 B CN 103399184B CN 201310337481 A CN201310337481 A CN 201310337481A CN 103399184 B CN103399184 B CN 103399184B
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China
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terminal
described
upper terminal
current
voltage
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CN201310337481.0A
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Chinese (zh)
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CN103399184A (en
Inventor
刘桐然
常晓华
李彦国
高玉华
蒋林江
黄红瑕
孙新凤
杜瑞红
王玮
徐凌燕
刘剑冲
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国网冀北电力有限公司廊坊供电公司
国家电网公司
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Priority to CN201310337481.0A priority Critical patent/CN103399184B/en
Publication of CN103399184A publication Critical patent/CN103399184A/en
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Publication of CN103399184B publication Critical patent/CN103399184B/en

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Abstract

The invention discloses a kind of combined connection box that conveniently can adjust phase sequence, be applied in high and low pressure metering outfit on-the-spot.Described combined connection box comprises box body, lid and is positioned at the circuit board of box body; Its improvement is, the upper terminal group of first, second terminal group comprises left and right voltage upper terminal arranged side by side and left and right current upper terminal respectively; Intersect between first end subgroup and the voltage upper terminal of the second terminal group and be electrically connected; Intersect between the current upper terminal that first end subgroup is corresponding to the second terminal group and be electrically connected; Be provided with switch between each voltage lower terminal and corresponding with it two voltage upper terminals, between each current lower terminal and corresponding with it two current upper terminals, be provided with switch, by the gangbar interlock of insulation between multiple switch.Its beneficial effect is: when there is negative phase sequence, by promoting gangbar and adjust phase sequence quickly and safely, avoid rewiring or improved cross connect and the hidden trouble of equipment that causes and technique unsightly.

Description

Conveniently can adjust the combined connection box of phase sequence

Technical field

The present invention relates to a kind of combined connection box that conveniently can adjust phase sequence, be especially 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 made up of to secondary circuit three part 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: be also watt-hour meter is the core of electric power meter, is the electric energy that metering load consumption or power supply send.

2, mutual inductor comprises current transformer and voltage transformer (VT).The effect of mutual inductor: the effect lacking Part III

(1) range of electric energy meter is expanded.Voltage transformer (VT) changes low-voltage into high-voltage variable, and big current is transformed into small area analysis by current transformer.

(2) the manufacture specification of instrument is decreased.Except direct access electric energy meter, current transformer is all based on 5A, and voltage transformer (VT) is all based on 100V.

(3) isolated high voltage, big current, ensure that 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 loop that the potential winding of voltage transformer (VT), electric energy meter and the wire both connection are formed.Electric current secondary loop refers to the loop that the current coil of Current Transformer Secondary coil, electric energy meter and the wire both connection are formed.The secondary load of current transformer comprises secondary and connects contact resistance etc. between conductor impedance, the impedance of electric energy meter current coil, terminal.

As shown in Figure 1, the circuit board 100 of the combined connection box of prior art is provided with respectively for first end subgroup, the second terminal group and the 3rd terminal group that the voltage and current of the wherein mutual inductor of a phase in U, V, W three-phase of alternating current passes through.Described first end subgroup, the second terminal group are connected with the secondary circuit of U, V, W phase respectively with the 3rd terminal group, in FIG, represent respectively with a, b, c, in addition circuit board 100 are also provided with the U passed 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 described mutual inductor is connected and be arranged at described circuit board top for be connected with electric energy meter and with described lower end subgroup the corresponding upper end subgroup arranged; Each described lower end subgroup includes a voltage lower terminal and three current lower terminals, 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 with the voltage terminal in the upper end subgroup above it by the first brace 11, and the voltage circuit of secondary circuit is connected; Meanwhile, three current lower terminals realize the connection of three by two the second braces 21, prevent the open circuit of electric current secondary loop.

Electric energy meter combines wiring by installing combined connection box with secondary circuit (voltage secondary circuit and electric current secondary loop), can realize easily and safely on-the-spot on-load time ammeter checked and under electriferous state, tears table, dress table open, to ensure to prevent in operating process electric current secondary loop from opening a way and voltage secondary circuit short circuit, while, can also be avoided leaving behind the economic loss that on-load switch makes user have a power failure to cause.

But easily there is the problem of negative phase sequence in associating wiring, below introduce the problem that phase sequence is relevant.

Correct phase sequence, one of should be that namely abc, bca, cab(abc correspond to U, V, W) three kinds of forms, due to all uncontrollable factors that city, rural power grid distribution line and lead-in wire thereof are constructed, often there is the wiring error of the negative phase sequence of metering secondary, namely there are one of acb, bac or cba tri-kinds of forms in phase sequence, although negative phase sequence does not affect the normal operation of secondary circuit, but the reactive measurement of electric energy meter can be made to occur error and mistake, and then the power examination affected in electricity charge calculating, the tariff recovery of electric company is caused damage.

Due to all measurement problems that negative phase sequence may bring, must sequence examing be carried out when checking and accepting power transmission, for there is negative phase sequence, generally at table tail place, the wiring of any two measuring elements being exchanged, reaching the object adjusted into table phase sequence.But so there is following problem and hidden danger in operation:

(1) exchange wiring and must cause wires cross, cause secondary circuit to connect up unintelligible.

(2) need to operate combined connection box during work, add accident risk point.

(3) obscuring of electric current, pressure-wire may be there is when exchanging wiring, 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, provides a kind of energy safety, switches the combined connection box of phase sequence fast, can realize changing sequence operation without rewiring.

For solving the problem, the invention provides a kind of combined connection box that conveniently can adjust phase sequence, comprising box body, lid and being positioned at the circuit board of described box body;

Described circuit board is provided with respectively for first end subgroup, the second terminal group and the 3rd terminal group that the voltage and current of the wherein secondary circuit of a phase in U, V, W three-phase of alternating current 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 the mutual inductor of described secondary circuit is connected and be arranged at described circuit board top for be connected with electric energy meter and with described lower end subgroup the corresponding upper end subgroup arranged;

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 and the left voltage upper terminal that be set up in parallel and right voltage upper terminal corresponding with described voltage lower terminal respectively, and the upper end subgroup of first end subgroup, the second terminal group also comprises the first corresponding with the first current lower terminal respectively left current upper terminal and the first right current upper terminal, the second left current upper terminal corresponding with the second current lower terminal and the second right current upper terminal, the three left current upper terminal corresponding with the 3rd current lower terminal and the 3rd right current upper terminal;

Be electrically connected 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 between the right voltage upper terminal of first end subgroup and the left voltage upper terminal of the second terminal group;

First left current upper terminal of described first end subgroup is electrically connected with the first right current upper terminal of described second terminal group, and the first right current upper terminal of first end subgroup is electrically connected with the first left current upper terminal under described second terminal group;

Second left current upper terminal of described first end subgroup is electrically connected with the second right current upper terminal of described second terminal group, and the second right current upper terminal of first end subgroup is electrically connected with the second left current upper terminal under described second terminal group;

3rd left current upper terminal of described first end subgroup is electrically connected with the 3rd right current upper terminal of described second terminal group, and the 3rd right current upper terminal of first end subgroup is electrically connected with the 3rd left current upper terminal under described second terminal group;

Each described voltage lower terminal and being provided with between the left voltage upper terminal corresponding with it and right voltage upper terminal make described voltage lower terminal respectively with the switch of described left voltage upper terminal or the conducting of right voltage upper terminal, each described current lower terminal and being provided with between the left current upper terminal corresponding with it and right current upper terminal make described current lower terminal respectively with the switch of described left current upper terminal or right current upper terminal conducting, by the gangbar interlock of an insulation between multiple described switch.

As preferably, described switch comprises conducting strip and the driving lever be connected with described gangbar by described conducting strip; One end of described conducting strip is rotationally connected with on described voltage lower terminal or described current lower terminal, other end left-right rotation under the effect of described driving lever.

As preferably, described gangbar is positioned at the outside of described lid, described lid offers the chute that the described driving lever of multiple confession 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 PC plastics.

As preferably, the material of described conducting strip is copper.

The combined connection box that conveniently can adjust phase sequence of the present invention has following beneficial effect: at the on-the-spot negative phase sequence once occur causing due to second loop return wiring error of power transmission, by promoting gangbar and adjust phase sequence quickly and safely, avoid rewiring or improved cross connect and the hidden trouble of equipment that causes and technique unsightly.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the combined connection box of prior art.

Fig. 2 is the schematic diagram that conveniently can adjust the combined connection box of phase sequence of one embodiment of the present of invention.

Fig. 3 is the schematic diagram that the gangbar of stirring in Fig. 2 carries out 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 conveniently can adjust phase sequence of one embodiment of the present of invention, comprises box body, lid and is positioned at the circuit board of described box body;

As shown in Figure 2, described circuit board 100 is provided with respectively for first end subgroup, the second terminal group and the 3rd terminal group that the voltage and current of the wherein secondary circuit of a phase in U, V, W three-phase of alternating current 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 (comprising voltage transformer (VT) or current transformer) of described secondary circuit and be arranged at described circuit board top for be connected with electric energy meter and with described lower end subgroup the corresponding upper end subgroup arranged; Each described lower end subgroup includes a voltage lower terminal and three current lower terminals, 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 characteristic and prior art 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 are all set to two arranged side by side.That is: first end subgroup, the upper terminal group of the second terminal group comprises and the left voltage upper terminal that be set up in parallel and right voltage upper terminal corresponding with described voltage lower terminal respectively, described first end subgroup, the upper end subgroup of the second terminal group also comprises corresponding with current lower terminal respectively and the left current upper terminal be set up in parallel and right current upper terminal, namely the first current lower terminal is corresponding with the first left current upper terminal and the first right current upper terminal, second current lower terminal is corresponding with the second left current upper terminal and the second right current upper terminal, 3rd current lower terminal is corresponding with the 3rd left current upper terminal and the 3rd right current upper terminal.Wherein first end subgroup corresponds to a phase voltage Ua and a phase current Ia(Ia '), the second terminal group corresponds to b phase voltage Ub and b phase current Ib(Ib ').

As shown in Figure 2, annexation about between voltage terminal: be electrically connected between the left voltage upper terminal of first end subgroup and the right voltage upper terminal of the second terminal group, is electrically connected between the right voltage upper terminal of first end subgroup and the left voltage upper terminal of the second terminal group.

Continue with reference to Fig. 2, annexation about between current terminal: the first left current upper terminal of first end subgroup is electrically connected with the first right current upper terminal of the second terminal group, the first right current upper terminal of first end subgroup is electrically connected with the first left current upper terminal of the second terminal group; Second left current upper terminal of first end subgroup is electrically connected with 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 with the second left current upper terminal of the second terminal group; 3rd left current upper terminal of first end subgroup is electrically connected with 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 with the 3rd left current upper terminal of the second terminal group.Connection between above voltage terminal and the connection between current terminal connect by P.e.c., do not use wire, namely ensure neat, the specification at wiring scene, the problem such as prevent again the wiring that may occur loosely, and reduce wire and take up space.

In order to realize phase sequence adjustment, please refer to Fig. 2 and Fig. 3, each voltage lower terminal and being provided with between the left voltage upper terminal corresponding with it and right voltage upper terminal make voltage lower terminal respectively with the switch of left voltage upper terminal or the conducting of right voltage upper terminal, each current lower terminal and being provided with between the left current upper terminal corresponding with it and right current upper terminal make current lower terminal respectively with the switch of left current upper terminal or right current upper terminal conducting, linked by the gangbar 3 of an insulation between multiple switch.Because Fig. 2 is circuit theory diagrams, therefore switch only uses switch symbols to replace, and illustrate only conducting strip 4, and gangbar 3 is actually the relation parallel with circuit board 100, therefore gangbar 3 adopts dotted line frame to replace.

State is as shown in Figure 2 positive phase sequence state, and the lower end that the arrow in figure represents is end of incoming cables and input end, and upper end is leading-out terminal and output terminal.Each voltage lower terminal left voltage upper terminal all corresponding thereto connects, and each current lower terminal left current upper terminal all corresponding thereto connects, and false state is as shown in Figure 2 positive phase sequence, then need not adjust.Namely input end and output terminal are the phase sequence of abc.

If there is the situation of negative phase sequence, as shown in Figure 3, namely the input end of a phase is connected with the b of the inductor of secondary circuit, namely the order of bac is become in the phase sequence of the input end of circuit board 100, in the state of fig. 2, then also should be the phase sequence of bac at output terminal, be the state of negative phase sequence.As long as stir gangbar 3 to the right, be the state shown in Fig. 3, then all switches are converted to and the upper terminal conducting on the right side of it from the upper terminal conducting on the left of it: each voltage lower terminal right voltage upper terminal all is corresponding thereto connected, and each current lower terminal right current upper terminal all corresponding thereto connects.Due to the above-mentioned annexation existed between the upper voltage terminal of first end subgroup in the present invention and the second terminal group and upper current terminal, when 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 first end subgroup.Then the b phase voltage of the lower end subgroup input of first end subgroup and electric current are just connected by the upper end subgroup of the second terminal group and electric energy meter, a phase voltage and the electric current of the lower end subgroup input of the second terminal group are connected with regard to the upper end subgroup and electric energy meter passing through the second terminal group, namely the phase sequence of the output terminal (upper end) of such circuit board 100 is adjusted to the order of abc, namely achieves the phase sequence exchange of a phase and b phase.Thus only need to stir quick, the safety adjustment that namely gangbar 3 achieves phase sequence, and both need not rewiring, avoid the intersection of wiring, also need not carry out other operation to combined connection box, safe ready.Certainly, if there is the problem of negative phase sequence in the condition shown in figure 3, then only gangbar 3 need be stirred left.

Preferably, although attached not shown, in fact switch can comprise conducting strip and the driving lever be connected with gangbar 3 by shown conducting strip; 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, namely achieves left and right and switches connection.In the present embodiment, the copper that the material selection electric conductivity of conducting strip is excellent.

For the ease of operation, gangbar 3 is positioned at the outside of lid, be arranged in parallel with lid, lid offers multiple chute slided for driving lever, prevents rocking of driving lever and gangbar 3.

Preferably, 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 is all more than or equal to 4cm, makes to keep enough insulation distances between it.In order to ensure that it does not discharge further, be 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 conveniently can 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, 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.

In the technical foundation of existing combined connection box, carry out transformation form by describing the combined connection box that conveniently can adjust phase sequence of the present embodiment above, at the on-the-spot negative phase sequence once occur causing due to second loop return wiring error of power transmission, phase sequence can be adjusted quickly and safely, avoid rewiring or improved cross connect and the hidden trouble of equipment caused and technique unsightly.And avoid the problems such as the technique point not up to standard, dangerous that traditional adjustment phase sequence method brings, the engineering time can also be shortened, high and low pressure metering outfit can be widely used in on-the-spot.

In addition, with reference to Fig. 2, the technology according to the application is instructed; those skilled in the art can also do suitable distortion on the basis of the present embodiment; such as, the input end of the circuit board shown in Fig. 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 are also considered as protection scope of the present invention.

Claims (7)

1. conveniently can 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 first end subgroup, the second terminal group and the 3rd terminal group that the voltage and current of the wherein secondary circuit of a phase in U, V, W three-phase of alternating current 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 the mutual inductor of described secondary circuit is connected and be arranged at described circuit board top for be connected with electric energy meter and with described lower end subgroup the corresponding upper end subgroup arranged;
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 and the left voltage upper terminal that be set up in parallel and right voltage upper terminal corresponding with described voltage lower terminal respectively, and the upper end subgroup of first end subgroup, the second terminal group also comprises the first corresponding with the first current lower terminal respectively left current upper terminal and the first right current upper terminal, the second left current upper terminal corresponding with the second current lower terminal and the second right current upper terminal, the three left current upper terminal corresponding with the 3rd current lower terminal and the 3rd right current upper terminal;
Be electrically connected 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 between the right voltage upper terminal of first end subgroup and the left voltage upper terminal of the second terminal group;
First left current upper terminal of described first end subgroup is electrically connected with the first right current upper terminal of described second terminal group, and the first right current upper terminal of first end subgroup is electrically connected with the first left current upper terminal under described second terminal group;
Second left current upper terminal of described first end subgroup is electrically connected with the second right current upper terminal of described second terminal group, and the second right current upper terminal of first end subgroup is electrically connected with the second left current upper terminal under described second terminal group;
3rd left current upper terminal of described first end subgroup is electrically connected with the 3rd right current upper terminal of described second terminal group, and the 3rd right current upper terminal of first end subgroup is electrically connected with the 3rd left current upper terminal under described second terminal group;
Each described voltage lower terminal and being provided with between the left voltage upper terminal corresponding with it and right voltage upper terminal make described voltage lower terminal respectively with the switch of corresponding described left voltage upper terminal or the conducting of right voltage upper terminal, each described current lower terminal and being provided with between the left current upper terminal corresponding with it and right current upper terminal make described current lower terminal respectively with the switch of described left current upper terminal or right current upper terminal conducting, by the gangbar interlock of an insulation between multiple described switch.
2. conveniently can adjust the combined connection box of phase sequence as claimed in claim 1, it is characterized in that, described switch comprises conducting strip and the driving lever be connected with described gangbar by described conducting strip; One end of described conducting strip is rotationally connected with on corresponding described voltage lower terminal or described current lower terminal, other end left-right rotation under the effect of described driving lever.
3. conveniently can adjust the combined connection box of phase sequence as claimed in claim 2, it is characterized in that, described gangbar is positioned at the outside of described lid, described lid offers the chute that the described driving lever of multiple confession slides.
4. conveniently can adjust the combined connection box of phase sequence as claimed in claim 1 or 2, it is characterized in that, the distance between the described left voltage upper terminal be connected and right voltage upper terminal and between the left current upper terminal be connected and right current upper terminal is all more than or equal to 4cm.
5. conveniently can adjust the combined connection box of phase sequence as claimed in claim 1, it is characterized in that, the both sides of the described left voltage upper terminal of described first end subgroup and the second terminal group, 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. conveniently can adjust the combined connection box of phase sequence as claimed in claim 1, it is characterized in that, the material of described box body, lid is PC plastics.
7. conveniently can adjust the combined connection box of phase sequence as claimed in claim 2, it is characterized in that, the material of described conducting strip is copper.
CN201310337481.0A 2013-08-05 2013-08-05 Conveniently can adjust the combined connection box of phase sequence CN103399184B (en)

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CN103969480A (en) * 2014-05-06 2014-08-06 国网上海市电力公司 Junction box special for 35kV and over 35kV metering device
CN104297541A (en) * 2014-11-06 2015-01-21 淄博夸克医药技术有限公司 Transformation combined junction box with changeable phase sequence
CN105203801A (en) * 2015-09-16 2015-12-30 国网天津市电力公司 United junction box for electrical energy measuring
CN105680425B (en) * 2016-01-19 2018-04-13 国网黑龙江省电力有限公司绥化供电公司 Plug-in type current switching terminal for protective relaying device
CN105609577A (en) * 2016-03-09 2016-05-25 中利腾晖光伏科技有限公司 Solar photovoltaic cell module
CN107918038B (en) * 2017-05-12 2020-04-07 国网浙江省电力公司湖州供电公司 Switch type phase sequence switching combined junction box
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CN108548947A (en) * 2018-03-30 2018-09-18 上海电力学院 A kind of guillotine type electric energy metering combined wiring box

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