CN110244098A - Two-in two-out combined junction box - Google Patents

Abstract

The invention relates to the technical field of power equipment, and specifically discloses a two-input and two-out joint junction box, comprising: three current terminal groups, each group of current terminal groups includes a first upper current terminal group, a second upper current terminal group, and a second upper current terminal group. The terminal group, the first lower current connection terminal group and the second lower current connection terminal group, the first upper current connection terminal group is connected in series with the first lower current connection terminal group through an upper current short piece; the second upper current connection terminal group The terminal group is communicated and short-circuited with the second lower current connection terminal group. The invention provides a two-input and two-out joint junction box, which facilitates the replacement of electric energy meters without power failure or live calibration, solves the problem that the existing joint junction box is prone to wiring errors, and makes the wiring of the secondary current circuit more accurate and convenient. .

Description

Two-in two-out combined junction box

technical field

The invention relates to the technical field of electric equipment, in particular to a two-input and two-outlet combined junction box.

Background technique

As a part of the electric energy metering device, the joint junction box is mainly used to connect the secondary line from the transformer to the electric energy meter through the joint junction box terminal. It is used in occasions such as metering device error, on-line measurement of wiring status, electricity inspection, and live energy meter replacement.

Figure 1 is a schematic structural diagram of an existing joint junction box, which generally includes a phase A voltage terminal group, an A phase current terminal group, a B phase voltage terminal group, a B phase current terminal group, and a C phase voltage terminal group , C-phase current terminal group and zero line terminal group.

Wherein, each voltage connection terminal group includes two upper voltage connection terminal groups and a lower voltage connection terminal group, and the upper voltage connection terminal group and the lower voltage connection terminal group are connected in series through a movable voltage shorting piece.

Each group of current connection terminals includes three upper current connection terminal groups and three lower current connection terminal groups, wherein the first upper current connection terminal group and the first lower current connection terminal group are short-circuited, and the second upper current connection terminal group and The second lower current connecting terminal group is short-circuited, the third upper current connecting terminal group and the third lower current connecting terminal group are short-circuited; the first upper current connecting terminal group and the second upper current connecting terminal group pass through a movable upper The current shorting pieces are connected in series; the second lower current terminal group and the third lower current terminal group are connected in series through a movable lower current shorting piece.

Under normal conditions: the voltage connecting piece is in the closed state, the upper voltage terminal group and the lower voltage terminal group are conducting; the upper current shorting piece is in the closed state, the first upper current terminal group and the second upper current terminal group conduction; the lower current shorting piece is in the disconnected state, and the second lower current terminal group and the third lower current terminal group are not conducting.

In terms of layout, all upper voltage terminal groups and upper current terminal groups are on one side of the combined junction box, and all lower voltage terminal groups and lower current terminal groups are on the opposite side. The current wiring area adopts the design of "three incoming wire holes and three outgoing wire holes":

(1) Generally, when connecting a normal current loop: the upper current shorting piece is in a closed state, the first upper current terminal group and the second upper current terminal group are conducting; the lower current shorting piece is disconnected state, the second lower current terminal group and the third lower current terminal group are not conducting; the current outflow terminal K1 of the current transformer is connected to the second lower current terminal group, and the current flows into the third lower current terminal group K2. The current connection terminal group is connected, and the two connection terminals of the electric energy meter are respectively connected to the first upper current connection terminal group and the third upper current connection terminal group through the secondary connection line, then the following current loop can be formed at this time: current transformer K1 - the second lower current terminal group - the second upper current terminal group - the upper current shorting piece - the first upper current terminal group - the energy meter - the third upper current terminal group - the second Three times the current terminal group - current transformer K2 to form a current closed loop.

(2) When the electric energy meter needs to be replaced with electricity, the voltage short-connector is disconnected, the lower current short-connector is closed, the second lower current terminal group and the third lower current terminal group are turned on, and the upper current short-connector is disconnected. The current circuit is as follows: K1 of the current transformer—the second lower current terminal group—the lower current shorting piece—the third lower current terminal group—K2 of the current transformer; the current secondary circuit is shorted, The electric energy meter can be replaced. After the replacement is completed, the voltage short-connector is closed, the lower current short-connector is disconnected, and the upper-current short-connector is turned on; the normal connection state of the junction box is restored.

(3) When it is necessary to connect the electric energy meter calibrator for detection, connect the electric energy meter calibrator with the second upper current terminal group and the first lower current terminal group respectively, and then disconnect the upper current shorting piece, Then the electric energy meter calibrator is connected in series into the current loop, specifically, the current loop is as follows: K1 of the current transformer—the second lower current terminal group—the second upper current terminal group—electric energy meter calibration Meter - the first lower current terminal group - the first upper current terminal group - energy meter - the third upper current terminal group - the third lower current terminal group - K2 of the current transformer.

Therefore, the existing combined junction box wiring is more particular, and it is not a simple connection relationship between the second lower current terminal group and the second upper current terminal group. In actual operation, electric personnel often make wiring errors due to negligence, such as The current incoming and outgoing wires of the electric energy meter are respectively connected to the second upper current terminal group and the third upper current terminal group.

If the wiring is wrong at the beginning, when it is necessary to replace the electric energy meter or connect to the electric energy meter calibrator later, the electric personnel will switch the on-off state of the short-circuit link of the lower current and the short-connection of the upper current according to the conventional operation, and the purpose cannot be achieved, resulting in the combined The junction box did not play its due role, which affected the normal operation and maintenance of power system metering.

Contents of the invention

An object of the present invention is to provide a two-input and two-out joint junction box, which can facilitate the replacement of the electric energy meter without power failure or live calibration work, and solve the problem that the existing joint junction box is prone to wiring errors.

In order to achieve the above purpose, on the one hand, the present invention provides a two-input and two-out combined junction box, including: A-phase current terminal group, B-phase current terminal group and C-phase current terminal group;

Each group of current connection terminals includes a first upper current connection terminal group, a second upper current connection terminal group, a first lower current connection terminal group and a second lower current connection terminal group, wherein the first upper current connection terminal group passes through An upper current short-connection piece is connected in series with the first lower current connection terminal group; the first lower current connection terminal group is connected in series with the second lower current connection terminal group through the lower current short-connection piece, and the first lower current connection terminal group is connected in series through the lower current connection terminal group. The second upper current terminal group is short-circuited with the second lower current terminal group;

Both the first upper current terminal group and the second upper current terminal group are located on the top of the two-input-two-out joint junction box, and the first lower current terminal group and the second lower current terminal group are both Located at the bottom of the two-in two-out combined junction box;

The front of the two-input and two-out joint junction box is provided with a first verification terminal and a second verification terminal, the first verification terminal is short-circuited with the first upper current terminal group, and the second The verification terminal is short-circuited with the first lower current terminal group.

The two-input and two-out combined junction box also includes a phase A voltage terminal set, a B phase voltage terminal set, a C phase voltage terminal set, and a neutral line terminal set.

Each voltage connection terminal group includes two upper voltage connection terminal groups and a lower voltage connection terminal group, and the upper voltage connection terminal group and the lower voltage connection terminal group are connected in series through a movable voltage shorting piece.

It should be noted that, when connecting in series with the calibrator of the electric energy meter for on-site calibration, the calibrator of the electric energy meter is firstly connected in parallel with the phase voltage terminals of the junction box, and then connected with the first calibrator of the junction box respectively. The test terminal is connected to the second test terminal; finally, the upper current shorting piece of the junction box is disconnected, so that the current loop is connected in series to the electric energy meter calibrator, and the meter can be calibrated on site.

The beneficial effects of the present invention are: to provide a two-input and two-out combined junction box, which can realize the function of non-stop replacement or live calibration of the electric energy meter, solve the problem that the existing combined junction box is prone to wiring errors, and make the secondary current The wiring of the circuit is more accurate and convenient.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative efforts.

Fig. 1 is the structural representation of the joint junction box that background technology provides;

Fig. 2 is a schematic structural diagram of a two-input two-out combined junction box provided by the embodiment.

In the picture:

1. A-phase voltage terminal group; 2. A-phase current terminal group; 3. B-phase voltage terminal group; 4. B-phase current terminal group; 5. C-phase voltage terminal group; 6. C-phase current Terminal set; 7. Zero line terminal set;

8. The first upper current terminal group; 9. The first lower current terminal group;

10. The second upper current terminal group; 11. The second lower current terminal group;

12. The third upper current terminal group; 13. The third lower current terminal group;

14. Upper current shorting piece; 15. Lower current shorting piece;

16. Upper voltage terminal group; 17. Lower voltage terminal group;

18. Voltage shorting piece;

19. The first verification terminal; 20. The second verification terminal.

Detailed ways

In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following description The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.

On the one hand, referring to Fig. 2, this embodiment provides a two-input and two-out joint junction box, including A-phase voltage terminal group 1, A-phase current terminal group 2, B-phase voltage terminal group 3, B-phase current terminal group Connecting terminal group 4, C-phase voltage connecting terminal group 5, C-phase current connecting terminal group 6 and neutral line connecting terminal group 7.

Each set of current connection terminal groups includes the first upper current connection terminal group 8, the second upper current connection terminal group 10, the first lower current connection terminal group 9 and the second lower current connection terminal group 11, wherein the first upper current connection terminal group Connecting terminal group 8 carries out series connection or disconnection with described first lower current connecting terminal group 9 through an upper current shorting piece 14; The lower current connection terminal group 11 is connected or disconnected in series, and the second upper current connection terminal group 10 and the second lower current connection terminal group 11 are short-circuited.

The first upper current connection terminal group 8 and the second upper current connection terminal group 10 are all located on the top of the two-in-two-out joint junction box, and the first lower current connection terminal group 9 and the second lower current connection terminal group The terminal groups 11 are all located at the bottom of the two-input and two-out joint junction box.

The front of the two-in two-out joint junction box is provided with a first verification terminal 19 and a second verification terminal 20, and the first verification terminal 19 communicates with the first upper current terminal group 8, so The second verification terminal 20 communicates with the first lower current connection terminal group 9 .

The voltage connection terminal group described in each group all includes two upper voltage connection terminal groups 16 and one lower voltage connection terminal group 17, and the upper voltage connection terminal group 16 and the lower voltage connection terminal group 17 are connected by a movable voltage short-connection piece 18. connected in series.

On the other hand, the two-input and two-out combined junction box provided in this embodiment can realize the function of replacing the electric energy meter without power failure. The current secondary circuit of the metering device includes a two-input and two-out combined junction box, a current transformer and an electric energy meter . When the electric energy meter is replaced without power failure, the lower current shorting piece 15 is in a closed state, and the current transformer is respectively connected with the first lower current terminal group 9 and the second lower current terminal group 11; the electric energy meter They are respectively connected to the first upper current connection terminal group 8 and the second upper current connection terminal group 10 .

Under normal conditions: the voltage connecting piece is in a closed state, the upper voltage terminal group 16 and the lower voltage terminal group 17 are conducting; the upper current shorting piece 14 is in a closed state, the first upper current terminal group 8 and the first lower The current connecting terminal group 9 is conducting; the lower current connecting terminal group 15 is in an off state, and the first lower current connecting terminal group 9 and the second lower current connecting terminal group 11 are not conducting.

In terms of layout, all upper voltage terminal groups 16 and upper current terminal groups are at the top of the combined junction box, all lower voltage terminal groups 17 and lower current terminal groups are at the bottom of the combined junction box, the first check The terminal 19 and the second verification terminal 20 are both on the front side, so it is not easy to make mistakes.

Generally, when performing normal current loop connection: the upper current short-connector 14 is in a closed state, the first upper current terminal group 8 and the first lower current terminal group 9 are conducting; the lower current short-connector 15 is in an off state. In the open state, the first lower current terminal group 9 and the second lower current terminal group 11 are not conducting; the current transformers are respectively connected to the first lower current terminal group 9 and the second lower current terminal group 11, and the electric energy meter The current input and output terminals are respectively connected to the first upper current terminal group 8 and the second upper current terminal group 10 through the secondary connection line, then the following current loop can be formed at this time: K1 of the current transformer—the first lower current Terminal group 9—upper current shorting piece 14—first upper current terminal group 8—energy meter—second upper current terminal group 10—second lower current terminal group 11—current mutual inductance device K2.

When it is necessary to replace the electric energy meter without power failure, the voltage short-connector 18 is disconnected, the lower current short-connector 15 is closed, the first lower current terminal group 9 and the second lower current terminal group 11 are conducted, and the current circuit is as follows: Current transformer K1——the first lower current terminal group 9——lower current shorting piece 15——the second lower current terminal group 11——current transformer K2; the current secondary circuit is shorted, and it can be carried out After the replacement work of the electric energy meter is completed, the voltage short-connector 18 is closed and the lower current short-connector 15 is disconnected to complete the replacement.

On the other hand, the two-input and two-out joint junction box of this embodiment can also realize the live calibration function of the electric energy meter. Meter and energy meter calibrator. The lower current shorting piece 15 is in the disconnected state, the upper current shorting piece 14 is in the disconnected state, K1 and K2 of the current transformer are respectively connected with the first lower current terminal group 9 and the second The lower current connection terminal group 11 is connected; the electric energy meter current input and output connection terminals are respectively connected with the first upper current connection terminal group 8 and the second upper current connection terminal group 10 through the secondary connecting wire; the electric energy meter check The meter is connected to the first verification terminal 19 and the second verification terminal 20 respectively.

It can be understood that, when it is necessary to connect the electric energy meter calibrator for detection, the electric energy meter calibrator is connected to the first verification terminal 19 and the second verification terminal 20 respectively, and then the upper current shorting piece 14 is disconnected. On, the electric energy meter calibrator is connected in series into the current loop, specifically, the current loop is as follows: K1 of the current transformer—the first lower current terminal group 9—the second calibration terminal 20—the electric energy meter Calibrator—the first calibration terminal 19—the first upper current terminal group 8—energy meter—the second upper current terminal group 10—the second lower current terminal group 11—current transformer The K2.

It should be noted that the two-input and two-out joint junction box provided in this embodiment is mainly improved for the current connection area of the traditional joint junction box, and the three-hole system is changed to the two-hole system, so that the wiring is simple and less prone to errors. On the other hand, the two-input and two-out combined junction box provided in this embodiment can be obtained by transforming the traditional combined junction box. The transformation process is simple and the transformation cost is low, which is beneficial to the promotion and use.

The two-input and two-outlet combined junction box provided in this embodiment does not have the problem of selecting two holes for connection from three holes, which is beneficial to reduce the wiring error rate and avoid affecting the metering operation and maintenance work of the power marketing system.

The description of the foregoing embodiments has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and used in a selected embodiment, even if not specifically shown or described. In many respects, the same elements or features may also be varied. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.

Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous details are set forth, such as examples of specific parts, devices and methods, in order to provide a thorough understanding of the embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.

The terminology used herein is for the purpose of describing particular example embodiments only and no limitation is intended. As used herein, the singular forms "a", "an", and "the" may be meant to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "including" and "having" are inclusive and thus specify that there are stated features, integers, steps, operations, elements and/or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring performance in the specific order discussed and illustrated, unless an order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be employed.

When an element or layer is referred to as being "on," "bonded to," "connected to," or "coupled to" another element or layer, it can be directly on, or in contact with, another element or layer. An element or layer may be bonded, connected or coupled to another element or layer, and intervening elements or layers may also be present. In contrast, when an element or layer is referred to as being "directly on," "directly engaged with," "directly connected to," or "directly coupled to" another element or layer, there may not be intervening elements or layers in between. Other words used to describe the relationship between elements should be interpreted in a like fashion (eg, "between" versus "directly between," "adjacent" versus "directly adjacent," etc.). As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections are not constrained by these terms. limit. These terms may be only used to distinguish one element, component, region or section from another element, component, region or section. Terms such as the terms "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Spatial relative terms, such as "inside", "outside", "underneath", "below so-and-so", "below", "above", "upper", etc., are used herein for descriptive purposes , to describe the relationship between one element or feature and one or more other elements or features as shown in the figures. Spatially relative terms may be meant to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of upward and downward. The device may be otherwise oriented, such as rotated 90 degrees or at other orientations, and the spatially relative descriptions herein are interpreted.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

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.