CN215868952U - Open-circuit prevention structure of current transformer and measurement switch - Google Patents

Abstract

The utility model provides an open-circuit prevention structure of a current transformer and a measurement switch. The utility model discloses an open-circuit prevention structure of a current transformer, which comprises the current transformer, a wire holder and a measuring unit, wherein a plug of the measuring unit is in plug-pull fit with the wire holder, an insulating partition plate is arranged in the plug in a protruding way towards the wire holder, the wire holder comprises at least one pair of short circuit reset elastic sheets, when the plug is inserted into the wire holder, the insulating partition plate separates the at least one pair of short circuit reset elastic sheets to separate two output ends of the current transformer, and a secondary side loop of the current transformer is disconnected; when the plug is pulled out of the wire holder, the at least one pair of short circuit reset elastic sheets are reset and closed, the secondary side loop of the current transformer is closed, the open circuit is prevented, and the current transformer is prevented from being burnt.

Description

Open-circuit prevention structure of current transformer and measurement switch

Technical Field

The utility model relates to the field of low-voltage electric appliances, in particular to an open-circuit prevention structure of a current transformer and a measurement switch.

Background

The measurement switch is an intelligent and modular switching device formed by deeply integrating the traditional switch with functions of high-precision measurement, communication, high-precision clock, event alarm, recording, freezing and the like based on the requirement of misalignment analysis and replacement of the conventional electric energy meter in combination with an application scene of a meter box. Meanwhile, the high-precision measurement data of the measurement switch can provide support for line loss analysis and load analysis of the transformer area, and the requirement of fine management of power utilization is met. The measuring switch comprises a current transformer and a pluggable measuring unit which are arranged in the measuring switch shell, and the current transformer is electrically connected with the measuring unit and used for testing the current in the main loop.

At present, when the main loop of the equivalent measuring switch is communicated with a large current, the secondary side signal lead of the current transformer detects a corresponding induced current, when the measuring unit is pulled out in an electrified way, the secondary side of the current transformer of the measuring switch can be opened, the secondary side of the current transformer can generate high voltage and generate electric arc due to long-time opening, the main loop current transformer is easy to burn, and the main body of the measuring switch is burnt or the product function is damaged.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a current transformer open-circuit prevention structure and a measuring switch for preventing a circuit transformer from being burnt when a measuring unit is separated from a wire holder.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides an open-circuit prevention structure of a current transformer, which comprises the current transformer, a wire holder and a measuring unit, wherein the current transformer is electrically connected with the wire holder; the plug is provided with an insulating partition plate in a protruding mode towards the wire holder, the wire holder comprises at least one pair of short circuit reset elastic sheets which are matched with the insulating partition plate and arranged oppositely, and the at least one pair of short circuit reset elastic sheets are connected with a secondary side loop of the current transformer;

when the plug is plugged into the wire holder, the insulating partition plate separates the at least one pair of short circuit reset elastic sheets, the secondary side loop of the current transformer is disconnected, and when the plug is pulled out of the wire holder, the at least one pair of short circuit reset elastic sheets are reset and closed, and the secondary side loop of the current transformer is closed.

Preferably, the plug comprises a plug body and a contact pin arranged on the plug body; the insulating partition plate is convexly arranged on the lower surface of the plug body; the wire holder comprises a wire holder body and an elastic sheet joint which is arranged on the wire holder body and is in contact fit with the contact pin, and the elastic sheet joint is electrically connected with the current transformer; the at least one pair of short circuit reset elastic sheets are arranged on the wire holder body.

Preferably, the length of the contact pin extending out of the lower surface of the plug body is greater than the length of the insulating partition plate protruding out of the lower surface of the plug body; when the plug is inserted into the wire holder, the contact pin is firstly in contact fit with the elastic sheet joint, and at least one pair of short circuit reset elastic sheets are isolated behind the insulating partition plate; when the plug is pulled out of the wire holder, the insulating partition plate is separated from the at least one pair of short circuit reset elastic sheets firstly so as to reset the at least one pair of short circuit reset elastic sheets, and the plug pins are separated from the elastic sheet connectors.

Preferably, each short circuit reset elastic sheet of each pair of short circuit reset elastic sheets comprises a protruding part facing to the other short circuit reset elastic sheet; when the plug is not inserted, the protruding parts of the two short circuit reset elastic sheets are in contact fit.

Preferably, an opening for inserting the insulating partition plate is formed at one end, inserted towards the insulating partition plate, of each pair of short circuit reset elastic sheets; the end of the insulating partition plate is provided with a chamfer convenient for inserting into the opening.

Preferably, the middle part of the wire holder body is provided with a hollow cavity for installing the at least one pair of short circuit reset elastic sheets, the two sides of the hollow cavity are provided with joint installation holes for installing elastic sheet joints, the elastic sheet joints and the short circuit reset elastic sheets are provided with pins with one ends of the wire holder body, the pins are connected with a current transformer, the reset elastic sheets and the elastic sheet joints are respectively installed in the hollow cavity and the joint installation holes, and the pins extend out of the lower surface of the wire holder body.

Preferably, the middle part of the lower surface of plug body is located in the insulation barrier protrusion, and the both sides of plug body are equipped with the contact pin mounting hole that is used for installing the contact pin, and the one end of contact pin stretches out to the upper surface of plug body from the contact pin mounting hole, and the other end stretches out the lower surface of plug body.

Preferably, the wire holder is fixedly mounted on the connection circuit board.

Preferably, a secondary side loop of the current transformer is connected with a short-circuit resistor in parallel.

The utility model also provides a measurement switch which comprises the open-circuit prevention structure of the current transformer.

The utility model discloses an open-circuit prevention structure of a current transformer, which comprises the current transformer, a wire holder and a measuring unit, wherein a plug of the measuring unit is in plug-pull fit with the wire holder, an insulating partition plate is arranged in the plug in a protruding way towards the wire holder, the wire holder comprises at least one pair of short circuit reset elastic sheets, when the plug is inserted into the wire holder, the at least one pair of short circuit reset elastic sheets are separated to separate two output ends of the current transformer, and a secondary side loop of the current transformer is disconnected; when the plug is pulled out of the wire holder, the at least one pair of short circuit reset elastic sheets are reset and closed, the secondary side loop of the current transformer is closed, the open circuit is prevented, and the current transformer is prevented from being burnt.

The length of the contact pin extending out of the lower surface of the plug body is greater than the length of the insulating partition plate protruding out of the lower surface of the plug body; when the plug is inserted into the wire holder, the contact pin is firstly in contact fit with the elastic sheet joint, and at least one pair of short circuit reset elastic sheets are isolated behind the insulating partition plate; when the plug is pulled out of the wire holder, the insulating partition plate is separated from the at least one pair of short circuit reset elastic sheets firstly so as to reset the at least one pair of short circuit reset elastic sheets, and the insulating partition plate is separated from the elastic sheet connector after the contact pin, so that the current transformer is prevented from being burnt out when the plug is pulled out of the wire holder, and the electricity utilization safety is improved.

In addition, a secondary side loop of the current transformer is connected with a short-circuit resistor in parallel, and the current transformer prevents an open-circuit structure and the short-circuit from being connected in parallel, so that the electrical safety is improved.

Drawings

FIG. 1 is a schematic view of a measurement switch according to the present invention;

FIG. 2 is a schematic view of another structure of the measurement switch of the present invention;

FIG. 3 is an exploded view of the wire holder and plug of the present invention;

FIG. 4 is a schematic view of the structure of the connection wiring board and the wiring holder of the present invention;

FIG. 5 is a schematic view of a measurement unit according to the present invention;

FIG. 6 is a schematic view of the contact structure of the connector base and the plug of the measuring unit of the present invention;

FIG. 7a is a schematic view of the plug of the present invention just inserted into the wire holder;

FIG. 7b is a schematic view of the plug of the present invention fully inserted into the wire holder;

FIG. 7c is a schematic view of the plug of the present invention being pulled out of the wire holder;

FIG. 8a is a schematic diagram of the shorting resistor of the present invention to prevent an open circuit;

FIG. 8b is a schematic diagram of the open circuit prevention structure of the current transformer of the present invention for preventing an open circuit;

fig. 8c is a schematic diagram of the parallel connection of the short-circuit resistor and the open-circuit prevention structure of the current transformer.

Detailed Description

The following describes a specific embodiment of the open-circuit prevention structure and the measurement switch of the current transformer according to the present invention with reference to the embodiments shown in fig. 1 to 8 c. The current transformer open-circuit prevention structure and the measuring switch of the present invention are not limited to the description of the following embodiments.

As shown in fig. 1, the measurement switch of the present invention includes a switch body 100 and a current transformer open-circuit prevention structure. The current transformer open-circuit prevention structure includes a current transformer 110 installed in the switch body 100.

Specifically, as shown in fig. 1, 2, and 4, the two ends of the switch body 100 are respectively provided with a connection terminal, the current transformer 110 is disposed near the connection terminal at one end, the connection circuit board 200 is located above the current transformer 110, and the connection base 210 is disposed at a corner of the connection circuit board 200 near the connection terminal at one end. The measuring switch has simple and compact structure.

As shown in fig. 3, the open-circuit prevention structure of the current transformer includes a current transformer 110, a wire holder 210 fixedly mounted on the connection circuit board 200, and a measuring unit 300, wherein the current transformer 110 is electrically connected to the wire holder 210, and a plug 310 of the measuring unit 300 is plugged into the wire holder 210 to electrically connect the current transformer 110 to the measuring unit 300; the plug 310 is provided with an insulating partition 320 protruding towards the wire holder 210, the wire holder 210 comprises at least one pair of short circuit reset spring pieces 220 which are matched with the insulating partition 320 and oppositely arranged, and the at least one pair of short circuit reset spring pieces 220 is connected with a secondary side loop of the current transformer 110; when the plug 310 is plugged into the wire holder 210, the insulating partition 320 separates the at least one pair of short circuit reset spring pieces 220, the secondary side loop of the current transformer 110 is opened, and when the plug 310 is pulled out of the wire holder 210, the at least one pair of short circuit reset spring pieces 220 are reset to be closed, and the secondary side loop of the current transformer 110 is closed.

The utility model discloses an open-circuit prevention structure of a current transformer, which comprises the current transformer, a wire holder and a measuring unit, wherein a plug of the measuring unit is in plug-pull fit with the wire holder, an insulating partition plate is arranged in the plug in a protruding way towards the wire holder, the wire holder comprises at least one pair of short circuit reset elastic sheets, when the plug is inserted into the wire holder, the at least one pair of short circuit reset elastic sheets are separated to separate two output ends of the current transformer, and a secondary side loop of the current transformer is disconnected; when the plug is pulled out of the wire holder, the at least one pair of short circuit reset elastic sheets are reset and closed, the secondary side loop of the current transformer is closed, the open circuit is prevented, and the current transformer is prevented from being burnt.

As shown in fig. 5, the plug 310 is located at a corner of the measuring unit 300, and the plug 310 is located opposite to the wire holder 210, so as to facilitate the plug 310 and the wire holder 210 to be inserted into and pulled out from each other.

As shown in fig. 3 and 6, the plug 310 includes a plug body 350 and pins 330 mounted on the plug body 350, and the lower surface of the plug body 35 is protruded with an insulating spacer 320. The plug body 350 is provided with a pin mounting hole 3501 for mounting the pin 330, one end of the pin 330 extends from the pin mounting hole 3501 to the upper surface of the plug body 350, and the other end extends from the lower surface of the plug body 350.

Specifically, as shown in the drawings, the plug body 350 is square, the insulating partition 320 is protruded from the middle of the lower surface of the plug body 350, and is used for separating at least one pair of short circuit reset spring pieces 220 of the wire holder 210, pin mounting holes 3501 are formed in two sides of the plug body 350, and 3 pin mounting holes 3501 are formed in each side. It should be noted that the shape of the plug body 350 is not limited in the present application, and the plug body 350 may also be configured to be circular or other shapes; the number of the pin mounting holes 3501 is not limited, and the number of the pin mounting holes 3501 may be set according to the number of the pins 330 required by the product. When mounting, the pin 330 extends from the lower surface of the plug body 350 to the upper surface of the plug body 350 from the pin mounting hole 3501, and the other end extends from the lower surface of the plug body 350, in order to limit the mounting position of the pin 330, a limiting structure may be disposed on the pin 330, for example, a limiting protrusion is disposed on the outer side wall of the pin 330.

As shown in fig. 3 and 6, the wire holder 210 includes a wire holder body 250 and a spring tab 230 mounted on the wire holder body 250 and in contact fit with the contact pin 330, wherein the spring tab 230 is electrically connected to the current transformer 110; at least one pair of short circuit reset spring pieces 220 are arranged on the wire holder body 250; the spring plate connector 230 and the short circuit reset spring plate 220 are provided with pins 240 at one end of the wire holder body 250, and the pins 240 are connected with the current transformer 110.

As shown in the figure, the short circuit reset spring plates 220 are three pairs, and three sets of spring plate connectors 230 are respectively disposed on two sides of the short circuit reset spring plates 220. The number and location of the spring fingers 230 should be opposite to the pins 330. The number and the arrangement positions of the short circuit reset spring 220 and the spring tab 230 are not limited, wherein the short circuit reset spring 220 can be arranged on one side of the wire holder body 250, and correspondingly, the insulating partition 320 is arranged on one side of the plug body 350. The number of the short circuit reset spring 220 and the spring connector 230 can be adjusted according to actual conditions.

As shown in fig. 3, a hollow cavity 2501 for installing at least one pair of short circuit reset spring pieces 220 is disposed in the middle of the wire holder body 250, connector installation holes 2502 for installing the spring piece connectors 230 are disposed on two sides of the hollow cavity 2501, and after the reset spring pieces 220 and the spring piece connectors 230 are respectively installed in the hollow cavity 2501 and the connector installation holes 2502, the pins 240 extend out of the lower surface of the wire holder body 250. As shown in the drawings, the wire holder body 250 is square, the hollow cavity 2501 in the middle of the wire holder body 250 is a rectangular cavity, and three square connector mounting holes 2502 are respectively formed on two sides of the hollow cavity 2501. The shape of the wire holder body 250 is not limited in the present application, and the shape of the wire holder body 250 may be circular or other shapes. The shape, number and position of the hollow cavity 2501 and the connector mounting holes 2502 are limited, and the shape, number and position of the hollow cavity 2501 and the connector mounting holes 2502 can be adjusted according to actual conditions. During installation, three pairs of short circuit reset spring plates 220 are installed in the hollow cavity 2501, the installation spring plate connectors 230 are respectively installed in the connector installation holes 2502 on two sides, and the pins 240 extend out of the lower portion of the wire holder body 250 and are connected with the current transformer.

As shown in fig. 3 and 6, in order to prevent the secondary circuit of the current transformer from being opened after the plug 310 is separated from the wire holder 210, the short circuit reset spring 220 should be shorted before the plug 310 is separated from the wire holder 210. The length of the contact pin 330 extending out of the lower surface of the plug body 350 is greater than the length of the insulating partition 320 protruding out of the lower surface of the plug body 350; when the plug 310 is inserted into the wire holder 210, the contact pin 330 is firstly in contact fit with the elastic sheet connector 230, and the insulating partition 320 isolates at least one pair of short circuit reset elastic sheets 220; when the plug 310 is pulled out of the wire holder 210, the insulating partition 320 is separated from the at least one pair of short circuit reset spring pieces 220 to reset the at least one pair of short circuit reset spring pieces 220, and the pin 330 is separated from the spring piece connector 230. The length of the contact pin extending out of the lower surface of the plug body is greater than the length of the insulating partition plate protruding out of the lower surface of the plug body; when the plug is inserted into the wire holder, the contact pin is firstly in contact fit with the elastic sheet joint, and at least one pair of short circuit reset elastic sheets are isolated behind the insulating partition plate; when the plug is pulled out of the wire holder, the insulating partition plate is separated from the at least one pair of short circuit reset elastic sheets firstly so as to reset the at least one pair of short circuit reset elastic sheets, and the insulating partition plate is separated from the elastic sheet connector after the contact pin, so that the current transformer is prevented from being burnt out when the plug is pulled out of the wire holder, and the electricity utilization safety is improved.

Specifically, the present application is explained with reference to fig. 7a, 7b and 7 c:

as shown in fig. 7a, when the plug 310 is just inserted into the wire holder 210, the pins 330 of the plug 310 are first connected to the spring contacts 230 of the wire holder 21.

As shown in fig. 7b, when the plug 310 is fully inserted into the wire holder 210, the insulating spacer 320 is in contact with and engaged with the short circuit reset spring 220 to isolate the short circuit reset spring 220.

As shown in fig. 7c, when the plug 310 is pulled out of the wire holder 210, the insulating partition 320 is separated from the at least one pair of short circuit resetting elastic pieces 220 to reset the at least one pair of short circuit resetting elastic pieces 220, and the secondary side of the current transformer is shorted first. The plug 310 continues to be pulled out of the wire holder 210 until it is completely removed, and the pin 330 is removed from the spring tab 230.

As shown in fig. 3, each short circuit reset spring piece 220 of each pair of short circuit reset spring pieces 220 comprises a protrusion 2201 facing the other short circuit reset spring piece 220; when the plug 310 is not inserted, the protruding portions 2201 of the two short circuit reset elastic sheets 220 are in contact fit. Preferably, the protrusion is rounded or pointed. As shown in the figure, the protrusion 2201 is pointed, and when processing, the protrusion 2201 can be formed by bending the upper portion of the short circuit reset spring 220.

Further, as shown in fig. 3, an opening 2202 for facilitating the insertion of the insulating spacer 320 is formed at an end of each pair of short reset spring pieces 220 inserted toward the insulating spacer 320. The opening 2202 has any one of a sharp-angled shape, a semicircular arc shape, and a semi-frame shape. The end of the insulating partition 320 is provided with a chamfer 3201 to facilitate insertion into the opening 2202. When the insulating partition 320 is inserted, the end of the insulating partition 320 is inserted from the opening 2202, so that the two short circuit reset spring pieces 220 are conveniently isolated, and the secondary side of the current transformer is disconnected.

As shown in fig. 8a and 8b, the measurement switch realizes an open circuit, and besides the open circuit prevention structure of the current transformer shown in fig. 8b, a short-circuit resistor may be connected in parallel to the secondary side loop of the current transformer 110. Alternatively, as shown in fig. 8c, a short-circuit resistor is connected in parallel to the open-circuit prevention structure of the current transformer. The secondary side loop of the current transformer is connected with a short-circuit resistor in parallel, and the current transformer prevents an open-circuit structure and the short-circuit from being connected in parallel, so that the electrical safety is improved.

The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims (10)

1. The utility model provides a current transformer prevents open circuit structure which characterized in that: the current transformer (110), the wire holder (210) and the measuring unit (300) are included, the current transformer (110) is electrically connected with the wire holder (210), and a plug (310) of the measuring unit (300) is matched with the wire holder (210) in a plugging and pulling mode so as to electrically connect the current transformer (110) and the measuring unit (300);

the plug (310) is provided with an insulating partition plate (320) in a protruding mode towards the wire holder (210), the wire holder (210) comprises at least one pair of short circuit reset elastic sheets (220) which are matched with the insulating partition plate (320) and are oppositely arranged, and the at least one pair of short circuit reset elastic sheets (220) are connected with a secondary side loop of the current transformer (110);

when the plug (310) is inserted into the wire holder (210), the insulating partition plate (320) separates the at least one pair of short circuit reset elastic sheets (220), the secondary side loop of the current transformer (110) is disconnected, and when the plug (310) is pulled out of the wire holder (210), the at least one pair of short circuit reset elastic sheets (220) are reset to be closed, and the secondary side loop of the current transformer (110) is closed.

2. The current transformer open-circuit prevention structure according to claim 1, characterized in that: the plug (310) comprises a plug body (350) and pins (330) mounted on the plug body (350); the insulating partition plate (320) is arranged on the lower surface of the plug body (350) in a protruding mode;

the wire holder (210) comprises a wire holder body (250) and a spring plate connector (230) which is arranged on the wire holder body (250) and is in contact fit with the contact pin (330), and the spring plate connector (230) is electrically connected with the current transformer (110); the at least one pair of short circuit reset spring pieces (220) are arranged on the wire holder body (250).

3. The current transformer open-circuit prevention structure according to claim 2, characterized in that: the length of the contact pin (330) extending out of the lower surface of the plug body (350) is greater than the length of the insulating partition plate (320) protruding out of the lower surface of the plug body (350);

when the plug (310) is inserted into the wire holder (210), the contact pin (330) is firstly contacted and matched with the elastic sheet joint (230), and at least one pair of short circuit reset elastic sheets (220) are isolated after the insulating partition plate (320);

when the plug (310) is pulled out of the wire holder (210), the insulating partition plate (320) is separated from the at least one pair of short circuit reset elastic sheets (220) firstly so as to reset the at least one pair of short circuit reset elastic sheets (220), and the pin (330) is separated from the elastic sheet connector (230).

4. The current transformer open-circuit prevention structure according to any one of claims 1 to 3, characterized in that: in each pair of short circuit reset spring plates (220), each short circuit reset spring plate (220) comprises a protrusion (2201) facing to the other short circuit reset spring plate (220); when the plug (310) is not inserted, the protruding parts (2201) of the two short circuit reset elastic sheets (220) are in contact fit.

5. The current transformer open-circuit prevention structure according to claim 4, characterized in that: an opening (2202) for inserting the insulating partition plate (320) is formed at one end, inserted towards the insulating partition plate (320), of each pair of short circuit reset elastic sheets (220); the end of the insulating partition (320) is provided with a chamfer (3201) for facilitating insertion into the opening (2202).

6. The current transformer open-circuit prevention structure according to claim 2, characterized in that: the middle part of wire holder body (250) is equipped with the installation cavity (2501) of at least a pair of short circuit reset shell fragment (220), the both sides of cavity (2501) are equipped with joint mounting hole (2502) that are used for installing shell fragment joint (230), shell fragment joint (230) and short circuit reset shell fragment (220) are equipped with stitch (240) with the one end of wire holder body (250), and stitch (240) are connected with current transformer (110), reset shell fragment (220) and shell fragment joint (230) are installed respectively in cavity (2501) and joint mounting hole (2502), and the lower surface of wire holder body (250) is stretched out in stitch (240).

7. The current transformer open-circuit prevention structure according to claim 2, characterized in that: the middle part of the lower surface of plug body (350) is located in insulating barrier (320) protrusion, and the both sides of plug body (350) are equipped with contact pin mounting hole (3501) that are used for installing contact pin (330), and the one end of contact pin (330) stretches out to the upper surface of plug body (350) from contact pin mounting hole (3501), and the other end stretches out the lower surface of plug body (350).

8. The current transformer open-circuit prevention structure according to claim 2, characterized in that: the wire holder (210) is fixedly arranged on the connecting circuit board (200).

9. The current transformer open-circuit prevention structure according to claim 1, characterized in that: and a secondary side loop of the current transformer (110) is connected with a short-circuit resistor in parallel.

10. A measurement switch, characterized in that: comprising the current transformer open-circuit prevention structure of any one of claims 1 to 9.

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