CN110244098A - Two into two go out formula combined connection box - Google Patents
Two into two go out formula combined connection box Download PDFInfo
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- CN110244098A CN110244098A CN201910677146.2A CN201910677146A CN110244098A CN 110244098 A CN110244098 A CN 110244098A CN 201910677146 A CN201910677146 A CN 201910677146A CN 110244098 A CN110244098 A CN 110244098A
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- 238000012795 verification Methods 0.000 claims abstract description 34
- 238000003756 stirring Methods 0.000 claims 1
- 230000005611 electricity Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/04—Housings; Supporting racks; Arrangements of terminals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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Abstract
The present invention relates to electrical equipment technical fields, specific open one kind two into two goes out formula combined connection box, it include: three current terminal subgroups, every group of current terminal subgroup includes current wiring terminal group on first, current wiring terminal group on second, the first lower current terminal subgroup and the second lower current terminal subgroup, and current wiring terminal group is shorted piece by electric current on one on first and the first lower current terminal subgroup is connected in series；Current wiring terminal group communicates short circuit with the second lower current terminal subgroup on second.The present invention provides one kind two into two and goes out formula combined connection box, facilitates do not have a power failure replacement or the electrification verification of electric energy meter, solves the problems, such as that existing combined connection box is easy wiring error, keep the wiring in secondary current circuit more acurrate and conveniently.
Description
Technical field
The present invention relates to electrical equipment technical fields, more particularly to one kind two into two to go out formula combined connection box.
Background technique
The a part of combined connection box as electric energy metering device, main function are that the secondary line for drawing mutual inductor passes through
Combined connection box end is connect with electric energy meter.Applied to metering device error, the on-line measurement of wiring situation, power utility check and band
The occasions such as charged renewal electric energy meter.
Fig. 1 is the structural schematic diagram of existing combined connection box, generally comprises A phase voltage terminals subgroup, A phase current
Terminals subgroup, B phase voltage terminals subgroup, B phase current terminals subgroup, C phase voltage terminals subgroup, C phase current wiring
Terminal group and zero curve terminals subgroup.
Wherein, every group of voltage terminal subgroup includes voltage link terminal group and once voltage terminal subgroup on two,
The voltage that upper voltage link terminal group and lower voltage terminal subgroup can be stirred by one is shorted piece and is connected in series.
Every group of current terminal subgroup includes current wiring terminal group and three lower current terminal subgroups on three, wherein
Current wiring terminal group and the first lower current terminal subgroup are shorted on first, current wiring terminal group and the second lower electricity on second
It flows terminals subgroup to be shorted, current terminal subgroup is shorted under current wiring terminal group and third in third；Electric current connects on first
The upper electric current that current wiring terminal group can be stirred by one in line end subgroup and second is shorted piece and is connected in series；Second lower electricity
The lower electric current that current terminal subgroup can be stirred by one under stream terminals subgroup and third is shorted piece and is connected in series.
In normal state: voltage connection sheet is in closed state, upper voltage link terminal group and lower voltage wiring terminal
Group conducting；Upper electric current is shorted piece and is in closed state, and current wiring terminal group is led in current wiring terminal group and second on first
It is logical；Lower electric current is shorted piece and is in an off state, and current terminal subgroup is not turned under the second lower current terminal subgroup and third.
In layout, all upper voltage link terminal groups and upper current wiring terminal group are in the one of combined connection box
Side, all lower voltage terminal subgroups and lower current terminal subgroup are in the other side on the other side, combined connection box
Electric current Wiring area uses the design of " three entrance holes, three outlet holes ":
(1) generally, when carrying out the connection of normal current loop: upper electric current is shorted piece and is in closed state, on first
Current wiring terminal group is connected in current terminal subgroup and second；Lower electric current is shorted piece and is in an off state, the second lower electric current
Current terminal subgroup is not turned under terminals subgroup and third；Under the electric current outflow connecting terminal K1 and second of current transformer
The connection of current terminal subgroup, electric current flow into connecting terminal K2 and connect with current terminal subgroup under third, the disengaging of electric energy meter
Two connecting terminals are connect with current wiring terminal group in current wiring terminal group on first and third respectively by secondary connecting line,
Following current loop: current transformer K1 --- the second lower current terminal subgroup --- electric current on second can be then formed at this time
--- upper electric current is shorted piece, and --- electric current connects current wiring terminal group --- electric energy meter --- terminals subgroup in third on first
Line end subgroup --- current terminal subgroup under third --- current transformer K2 is to form a circuit closed circuit.
(2) when needing live replacement of electric energy meter, being shorted voltage, piece is disconnected, lower electric current is shorted piece closure, the second lower electricity
It flows current terminal subgroup under terminals subgroup and third to be connected, upper electric current is shorted piece and disconnects, and current loop is as follows: Current Mutual Inductance
--- --- lower electric current is shorted piece --- current terminal subgroup under third --- electricity to the second lower current terminal subgroup to the K1 of device
The K2 of current transformer；Electric current secondary loop is shorted, and can carry out more changing jobs for electric energy meter, after completing replacement, keeps voltage short
Contact pin closure, lower electric current are shorted piece disconnection, upper electric current is shorted piece conducting；The normal wiring state of reconnection box.
(3) when need to access powermeter verification instrumeter detected when, by powermeter verification instrumeter respectively with second on electric current connect
Line end subgroup is connected with the first lower current terminal subgroup, so that electric current is shorted piece and is disconnected, then powermeter verification instrumeter is gone here and there
Couple in current loop, specifically, current loop is as follows: the K1 of current transformer --- the second lower current wiring terminal
--- --- powermeter verification instrumeter --- the first lower current terminal subgroup --- is on first for current wiring terminal group on second for group
Current terminal subgroup --- electric energy meter --- current wiring terminal group in third --- current terminal subgroup under third ---
The K2 of current transformer.
Therefore, existing combined connection box wiring is than more elegant, and is not the simple second lower current terminal subgroup
With second on current wiring terminal group be correspondingly connected with relationship, in practical operation, electric power personnel often because carelessness and wiring is wrong
Accidentally, for example, occur by the electric current inlet-outlet line of electric energy meter respectively with second on current wiring terminal in current wiring terminal group and third
Situations such as group connection.
If at the very start wiring malfunction, it is subsequent need replacing electric energy meter or access powermeter verification instrumeter when, electric power personnel
It is unable to reach purpose according to the switching that routine operation carries out lower electric current short circuit piece and upper electric current short circuit piece on off operating mode, causes to combine
Terminal box, which is not played, should effect, affect the normal maintenance work of measurement of power.
Summary of the invention
It is an advantage of the invention to provide one kind two into two to go out formula combined connection box, can facilitate not stopping for electric energy meter
Charged renewal or electrification verifying work solve the problems, such as that existing combined connection box is easy wiring error.
To achieve these objectives, on the one hand, the present invention provides one kind two into two and goes out formula combined connection box, comprising: A phase current connects
Line end subgroup, B phase current terminals subgroup and C phase current terminals subgroup；
Every group of current terminal subgroup includes current wiring terminal group on first, current wiring terminal group, on second
Once current terminal subgroup and the second lower current terminal subgroup, wherein current wiring terminal group is powered on by one on first
Stream is shorted piece and is connected in series with the described first lower current terminal subgroup；First lower current terminal subgroup passes through electric
Stream is shorted piece and is connected in series with described second time current terminal subgroup, on described second current wiring terminal group with it is described
Second lower current terminal subgroup is shorted；
On described first in current wiring terminal group and second current wiring terminal group be respectively positioned on described two into two go out formula connection
The top of splice grafting wire box, the described first lower current terminal subgroup and the second lower current terminal subgroup are respectively positioned on described two into two
The bottom of formula combined connection box out；
Described two into two go out formula combined connection box fronts be equipped with first verification terminal and second verification terminal, described first
It verifies current wiring terminal group on terminal and described first to be shorted, the second verification terminal and the described first lower current terminal
Subgroup is shorted.
Described two into two go out formula combined connection box further include A phase voltage terminals subgroup, B phase voltage terminals subgroup and
C phase voltage terminals subgroup, zero curve terminals subgroup.
Voltage terminal subgroup described in every group includes voltage link terminal group and once voltage terminal subgroup on two, on
The voltage that voltage terminal subgroup and lower voltage terminal subgroup can be stirred by one is shorted piece and is connected in series.
It should be noted that powermeter verification instrumeter is first distinguished when to concatenate calibration live into powermeter verification instrumeter progress
It is connected in parallel with the terminal box phase voltage terminal, then verifies terminal and the second verification terminal with the terminal box first respectively
Connection；The upper electric current for disconnecting terminal box afterwards is shorted piece, concatenates current loop in powermeter verification instrumeter, so that it may carry out scene
Calibration.
The beneficial effects of the present invention are: one kind two into two is provided and formula combined connection box, electric energy meter is able to achieve and does not have a power failure
The function of replacement or electrification verification solves the problems, such as that existing combined connection box is easy wiring error, makes secondary current circuit
Wiring is more acurrate and conveniently.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram for the combined connection box that background technique provides；
The structural schematic diagram that Fig. 2 goes out formula combined connection box for embodiment provides two into two.
In figure:
1, A phase voltage terminals subgroup；2, A phase current terminals subgroup；3, B phase voltage terminals subgroup；4, B phase current
Terminals subgroup；5, C phase voltage terminals subgroup；6, C phase current terminals subgroup；7, zero curve terminals subgroup；
8, current wiring terminal group on first；9, the first lower current terminal subgroup；
10, current wiring terminal group on second；11, the second lower current terminal subgroup；
12, current wiring terminal group in third；13, current terminal subgroup under third；
14, upper electric current is shorted piece；15, lower electric current is shorted piece；
16, upper voltage link terminal group；17, lower voltage terminal subgroup；
18, voltage is shorted piece；
19, the first verification terminal；20, the second verification terminal.
Specific embodiment
To enable the purpose of the present invention, feature, advantage more obvious and understandable, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that reality disclosed below
Applying example is only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
On the one hand, referring to fig. 2, the present embodiment provides one kind two into two to go out formula combined connection box, including A phase voltage terminals
Subgroup 1, A phase current terminals subgroup 2, B phase voltage terminals subgroup 3, B phase current terminals subgroup 4, C phase voltage terminals
Subgroup 5, C phase current terminals subgroup 6 and zero curve terminals subgroup 7.
Every group of current terminal subgroup include current wiring terminal group 10 in current wiring terminal group 8, second on first,
First lower current terminal subgroup 9 and the second lower current terminal subgroup 11, wherein current wiring terminal group 8 passes through on first
Electric current is shorted piece 14 and is connected in series or is disconnected with the described first lower current terminal subgroup 9 on one；First lower electric current wiring
Terminal group 9 is shorted piece 15 by electric current once and is connected in series or is disconnected with the described second lower current terminal subgroup 11, institute
Current wiring terminal group 10 on second is stated to be shorted with the described second lower current terminal subgroup 11.
On described first in current wiring terminal group 8 and second current wiring terminal group 10 be respectively positioned on described two into two go out formula
The top of combined connection box, the described first lower current terminal subgroup 9 and the second lower current terminal subgroup 11 are respectively positioned on described
Two into two go out the bottom of formula combined connection box.
Described two into two fronts for going out formula combined connection box are equipped with the first verification terminal 19 and the second verification terminal 20, described
First verification terminal 19 is connected to current wiring terminal group 8 on described first, under the second verification terminal 20 and described first
Current terminal subgroup 9 is connected to.
Voltage terminal subgroup described in every group includes voltage link terminal group 16 and once voltage terminal subgroup on two
17, the voltage that upper voltage link terminal group 16 and lower voltage terminal subgroup 17 can be stirred by one is shorted piece 18 and carries out series connection company
It connects.
On the other hand, provided in this embodiment two into two go out formula combined connection box and can realize that electric energy meter does not have a power failure and replace function
Can, go out formula combined connection box, current transformer and electric energy meter including two into two in the electric current secondary loop of metering device.Electric energy meter
Do not have a power failure replace when, lower electric current is shorted piece 15 and be in closed state, the current transformer respectively with described first time electric current
Terminals subgroup 9 and the second lower current terminal subgroup 11 connect；The electric energy meter respectively with described first on current terminal
Current wiring terminal group 10 connects in subgroup 8 and second.
In normal state: voltage connection sheet is in closed state, upper voltage link terminal group 16 and lower voltage terminal
Subgroup 17 is connected；Upper electric current is shorted piece 14 and is in closed state, current wiring terminal group 8 and the first lower current terminal on first
Subgroup 9 is connected；Lower electric current is shorted piece 15 and is in an off state, the first lower current terminal subgroup 9 and the second lower current terminal
Subgroup 11 is not turned on.
In layout, all upper voltage link terminal groups 16 and upper current wiring terminal group are in the top of combined connection box
Portion, all lower voltage terminal subgroups 17 and lower current terminal subgroup are in the bottom of combined connection box, the first checkout terminal
Son 19 and the second verification terminal 20 are in front, it is not easy to wrong.
Generally, when carrying out the connection of normal current loop: upper electric current is shorted piece 14 and is in closed state, and first powers on
It flows terminals subgroup 8 and the first lower current terminal subgroup 9 is connected；Lower electric current is shorted piece 15 and is in an off state, the first lower electricity
Stream terminals subgroup 9 and the second lower current terminal subgroup 11 are not turned on；Current transformer descends current terminal with first respectively
Subgroup 9 and the second lower current terminal subgroup 11 connect, electrical energy meter electricity flow into or out connecting terminal by secondary connecting line respectively with
Current wiring terminal group 10 connects in current wiring terminal group 8 and second on first, then can form following current loop at this time:
K1 --- the first lower current terminal subgroup 9 --- upper electric current is shorted piece 14 --- current terminal on first of current transformer
--- --- electric current is mutual for current wiring terminal group 10 on second --- the second lower current terminal subgroup 11 --- for electric energy meter for subgroup 8
The K2 of sensor.
When need not have a power failure replace electric energy meter when, being shorted voltage, piece 18 disconnects, lower electric current is shorted piece 15 and is closed, under first
Current terminal subgroup 9 and the second lower current terminal subgroup 11 are connected, and current loop is as follows: current transformer K1 --- and first
--- lower electric current is shorted piece 15 --- the second lower current terminal subgroup 11 --- current transformer to lower current terminal subgroup 9
K2；Electric current secondary loop is shorted, and can carry out more changing jobs for electric energy meter, after completing replacement, be closed voltage short circuit piece 18,
Lower electric current is shorted piece 15 and disconnects, and completes replacement.
In another aspect, the two of the present embodiment into two go out formula combined connection box can also realize electric energy meter charge verifying function,
Go out formula combined connection box, current transformer, electric energy meter and electric energy meter including two into two in the electric current secondary loop of metering device
Tester.The lower electric current is shorted piece 15 and is in an off state, and the upper electric current is shorted piece 14 and is in an off state, the electric current
The K1 and K2 of mutual inductor are connect with the described first lower current terminal subgroup 9 and the second lower current terminal subgroup 11 respectively；Institute
State electrical energy meter electricity flow into or out connecting terminal by secondary connecting line respectively with described first in current wiring terminal group 8 and second
Current terminal subgroup 10 connects；The powermeter verification instrumeter verifies terminal 20 with the first verification terminal 19 and second respectively
Connection.
It is understood that when need to access powermeter verification instrumeter detected when, by powermeter verification instrumeter respectively with
One verification terminal 19 and the second verification terminal 20 connect, and so that electric current is shorted piece 14 and disconnect, then powermeter verification instrumeter is gone here and there
Couple in current loop, specifically, current loop is as follows: the K1 of current transformer --- the first lower current terminal subgroup
9 --- the second verification terminal 20 --- powermeter verification instrumeter --- the first verification terminal 19 --- current wiring terminal groups on first
8 --- electric energy meter --- current wiring terminal group 10 on second --- the second lower current terminal subgroup 11 --- current transformers
K2.
It should be noted that provided in this embodiment two into two go out formula combined connection box mainly for traditional joint wiring
The electric current Wiring area of box is improved, and three hole standards is changed to diplopore standard, wiring is simple, not easy to make mistakes.On the other hand, originally
The two into two of embodiment offer go out formula combined connection box can be transformed to obtain on the basis of traditional combined connection box, change
It is simple to make process, improvement expenses are lower, are conducive to two into two popularizations and use for going out formula combined connection box.
Provided in this embodiment two into two go out the problem of formula combined connection box is connected there is no the three hole holes Xuan Liang, are conducive to drop
Low wiring error rate avoids the metering maintenance work to Electric Power Marketing System from impacting.
The description of above-described embodiment is provided with the purpose of illustration and description.It is not intended to exhaustion or the limitation disclosure.It is specific
Embodiment individual component or feature be generally free from the limitation of specific embodiment, but in where applicable, even if not having
It is specifically illustrated in or describes, can be interchanged and for selected embodiment.In many aspects, identical element or feature
Also it can change.This variation is not to be regarded as a departure from the disclosure, and all this modifications mean to be included in the disclosure
In the range of.
Example embodiment is provided, so that the disclosure will become thoroughly, and the range fully will be conveyed to ability
Technical staff in domain.In order to understand thoroughly embodiment of the disclosure, numerous details, such as specific component, device and side are illustrated
The example of method.Clearly for those skilled in that art, do not need using specific details, example embodiment can be with many
Different forms is implemented, and neither should be construed as limiting the scope of the present disclosure.In some example embodiments, not right
Well known process, well known apparatus structure and well known technology are described in detail.
Here, using specialized vocabulary only for describing the purpose of specific example embodiment, and not mean to limit
Purpose.Unless context clearly makes opposite expression, singular " one (a) " as used herein, " one (an) "
" being somebody's turn to do (the) " can mean also to include plural form.Term " including (comprises) ", " including (comprising) ",
" including (including) " and it is included in the interior meaning " with (having) ", and therefore specifies and there is stated spy
Sign, entirety, step, operation, element and/or component, but do not exclude the presence of or extraly have other spies of one or more
Sign, entirety, step, operation, element, component and/or combination thereof.Unless explicitly indicated the order executed, it is described herein
This method step, handling and operation are not interpreted as centainly needing to execute according to the specific order discussed and shown.Should also
Understand, it can be using additional or selectable step.
When element or layer be known as " ... on ", " with ... engage ", " being connected to " or " being connected to " another
Element or layer can be and engage, be connected to or couple directly on another element or layer, with another element or layer
To another element or layer, there may also be intervenient element or layers.In contrast, when element or layer are known as " straight
On connecing ... ", " with ... directly engage ", " being directly connected to " or " being directly coupled to " another element or layer, then may be used
Intervenient element or layer can be not present.Other words for being used to describe element relation should explain (example in a similar way
Such as, " ... between " and " between directly existing ... ", " adjacent " and " direct neighbor " etc.).Term "and/or" as used herein
Any and all combination of one or more including associated the enumerated project.Although may have been used art herein
Language first, second, third, etc. to describe various elements, component, regions, layers, and/or portions, these elements, component, region,
Layer and/or part are not limited by these terms.These terms can be served only for an element, component, region or part
It is distinguished with another element, component, region or part.Unless clearly showed that by context, herein using such as term " the
One ", the term of " second " and other numerical value is it is not intended that sequence or order.Therefore, lower section discuss first element, component,
Region, layer or part can be implemented using second element, component, region, layer or partial term without departing from the example
The introduction of example.
The relative terms in space, such as "inner", "outside", " below ", " in so-and-so lower section ", " lower part ", " top ",
" top " etc. can use herein for convenient for the purpose of description, to describe an element or feature as illustrated in the drawing and another
Relationship between outer one or more element or feature.The relative terms in space can mean the orientation comprising describing except the figure
Except the device different orientations.For example, if overturn the device in the figure, then it is described as " in other elements or feature
Element of the lower section " either " below element or feature " will be oriented to " in the top of other elements or feature ".Therefore,
Exemplary term " ... lower section " may include upwardly and downwardly two kinds orientations.The device can be otherwise orientated,
Such as it is rotated by 90 ° or other orientations, and explained with the opposite description in space herein.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (3)
1. one kind two goes out formula combined connection box into two characterized by comprising A phase current terminals subgroup (2), B phase current connect
Line end subgroup (4) and C phase current terminals subgroup (6)；
Every group of current terminal subgroup include current wiring terminal group (8) on first, current wiring terminal group (10) on second,
First lower current terminal subgroup (9) and second lower current terminal subgroup (11), wherein current wiring terminal group on first
(8) pass through electric current short circuit piece (14) and described first lower current terminal subgroup (9) on one to be connected in series；First lower electric current
Terminals subgroup (9) is shorted piece (15) by electric current once and carries out the company of series connection with described second lower current terminal subgroup (11)
It connects, current wiring terminal group (10) is shorted with described second lower current terminal subgroup (11) on described second；
On described first in current wiring terminal group (8) and second current wiring terminal group (10) be respectively positioned on described two into two go out formula
The top of combined connection box, described first lower current terminal subgroup (9) and second lower current terminal subgroup (11) are respectively positioned on
Described two into two go out the bottom of formula combined connection box；
Described two into two fronts for going out formula combined connection box are equipped with the first verification terminal (19) and the second verification terminal (20), described
First verification terminal (19) is connected to current wiring terminal group (8) on described first, it is described second verify terminal (20) with it is described
First lower current terminal subgroup (9) connection.
2. according to claim 1 two into two go out formula combined connection box, which is characterized in that further include A phase voltage terminals
Subgroup (1), B phase voltage terminals subgroup (3) and C phase voltage terminals subgroup (5), zero curve terminals subgroup (7).
3. according to claim 2 two into two go out formula combined connection box, which is characterized in that voltage wiring terminal described in every group
Group includes voltage link terminal group (16) and once voltage terminal subgroup (17) on two, upper voltage link terminal group (16) and
The voltage that lower voltage terminal subgroup (17) can stir by one is shorted piece (18) and is connected in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910677146.2A CN110244098A (en) | 2019-07-25 | 2019-07-25 | Two into two go out formula combined connection box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910677146.2A CN110244098A (en) | 2019-07-25 | 2019-07-25 | Two into two go out formula combined connection box |
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| CN110244098A true CN110244098A (en) | 2019-09-17 |
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| CN201910677146.2A Pending CN110244098A (en) | 2019-07-25 | 2019-07-25 | Two into two go out formula combined connection box |
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| CN108037336A (en) * | 2017-12-20 | 2018-05-15 | 上海国缆智能电气有限公司 | A kind of three-phase separated time electric energy meter novel integrated terminal box |
| CN208125793U (en) * | 2018-05-15 | 2018-11-20 | 国网福建省电力有限公司 | Modified electric energy meter Special test terminal box |
| CN209069994U (en) * | 2018-11-02 | 2019-07-05 | 海燕接线盒有限公司 | A kind of electric energy metering combined wiring box |
| CN210294366U (en) * | 2019-07-25 | 2020-04-10 | 广东电网有限责任公司 | Two-in and two-out combined junction box |
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