Current transformer and alarm device thereof

Abstract

The utility model discloses a current transformer and an alarm device thereof, the alarm device comprises a monitoring wire harness group electrically connected with a secondary winding of the current transformer, and the monitoring wire harness group comprises a first monitoring wire and a second monitoring wire; an alarm unit is arranged on the inner side of the alarm unit main body, a first wiring terminal and a second wiring terminal are arranged on the alarm unit main body, the first wiring terminal is connected with the first monitoring line, and the second wiring terminal is connected with the second monitoring line; the alarm unit main body is also provided with a wiring terminal switching assembly, and the wiring harness connecting end switching assembly switches the positions of the first wiring terminal and the second wiring terminal, so that one of the first monitoring line and the second monitoring line is electrically connected with the alarm unit. According to the utility model, the phenomenon that the monitoring wire harness is damaged due to overheating during use can be effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of current transformers, and in particular relates to a secondary winding alarm device for a low-voltage current transformer. Background Art

[0002] Current transformers are used to convert large currents into specified small currents. They are essential components for ammeters, watt-hour meters, and current control systems. When there is a problem with the internal output line of the current transformer, the temperature will be too high. In order to reduce the phenomenon of overheating and damage to the equipment, an alarm device is usually set to monitor the equipment, which can effectively reduce the heat of the equipment.

[0003] Since the secondary winding of the low-voltage current transformer will transmit a certain amount of heat energy to the monitoring harness of the secondary winding connected to the alarm device during operation, and the monitoring harness will also generate a certain amount of heat energy when it is working, the monitoring harness will gather a large amount of heat energy when it is working, and ultimately the monitoring harness of the alarm device will be easily damaged due to overheating during use. Utility Model Content

[0004] To this end, the utility model proposes an alarm device for a secondary winding of a current transformer, which can effectively reduce the damage of a monitoring harness due to overheating during use.

[0005] In view of the above technical problems, the utility model provides the following technical solutions:

[0006] An alarm device for a current transformer comprises a monitoring wire harness group electrically connected to a secondary winding of the current transformer, the monitoring wire harness group comprising a first monitoring line and a second monitoring line; an alarm unit body, an alarm unit is arranged inside the alarm unit body, a first wiring terminal and a second wiring terminal are arranged on the alarm unit body, the first wiring terminal is connected to the first monitoring line, and the second wiring terminal is connected to the second monitoring line; a wiring terminal switching component is also arranged on the alarm unit body, the wiring harness connection end switching component switches the position of the first wiring terminal and the second wiring terminal, so that one of the first monitoring line and the second monitoring line is electrically connected to the alarm unit.

[0007] In some embodiments of the utility model, the terminal switching assembly includes: a power connection piece, fixedly connected to the alarm unit; an insulating support assembly, rotatably connected to the alarm unit body, and the first terminal and the second terminal are installed on the insulating support assembly; a rotation drive device, which drives the insulating support assembly to rotate between a first position and a second position, and when the insulating support assembly is in the first position, the first terminal is electrically connected to the power connection piece; when the insulating support assembly is in the second position, the second terminal is electrically connected to the power connection piece.

[0008] In some embodiments of the utility model, the insulating support assembly includes: an insulating rotating shaft, which is drivingly connected to the output shaft of the rotating drive device; an insulating support plate, which is fixedly connected to the insulating rotating shaft, and the first connecting terminal and the second connecting terminal are installed on the insulating support plate, and the distances from the first connecting terminal and the second connecting terminal to the axis of the insulating rotating shaft are equal.

[0009] In some embodiments of the utility model, the first terminal and the second terminal respectively include: a first connecting end located on a first side of an insulating support sheet and a second connecting end located on a second side of the insulating support sheet; the first connecting end is electrically connected to a monitoring harness group, and the second connecting end includes an insulating guide ring fixedly connected to the insulating support sheet, an insulating guide body slidably connected to the insulating guide ring, and a conductive portion fixedly connected to the insulating guide body on a side away from the insulating support sheet, a connecting wire is inserted into the insulating guide body, one end of the connecting wire is electrically connected to the first connecting end, and the other end is electrically connected to the conductive portion.

[0010] In some implementation modes of the present invention, the conductive portion is a hemisphere, and the radius of the hemisphere is greater than the thickness of the power connection sheet.

[0011] In some implementations of the utility model, an elastic member is arranged between the insulating support sheet and the insulating guide body, and the elastic force of the elastic member is suitable for moving the insulating guide body in a direction away from the insulating support sheet.

[0012] In some implementation modes of the utility model, the rotary drive device is a rotary motor, and the rotary drive device is transmission-connected to the insulating shaft via a gear transmission assembly.

[0013] Some implementation modes of the utility model further include a control chip and a time relay, and the control chip controls the rotation of the rotary drive device according to the set value of the time relay.

[0014] The utility model also provides a current transformer, which comprises the alarm device.

[0015] The technical solution of the utility model has the following technical effects compared with the prior art:

[0016] In the alarm device of the current transformer provided by the utility model, the terminal switching component can switch the monitoring harness electrically connected to the alarm unit, so that the first monitoring harness and the second monitoring harness are electrically connected to the alarm unit in turn. The intermittent use of the monitoring harness group can give each monitoring line a certain cooling time for cooling, thereby effectively reducing the damage of the monitoring harness due to overheating during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0018] Figure 1 A schematic diagram of a specific implementation of the alarm device for the current transformer of the utility model;

[0019] Figure 2 It is a schematic diagram of a terminal switching assembly in an alarm device of a current transformer of the utility model;

[0020] Figure 3 This utility model Figure 1 Top view at point A in the middle;

[0021] Figure 4 It is a cross-sectional view of the second connection end of the first wiring terminal / the second wiring terminal in the utility model. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] like Figure 1 The figure shows a specific implementation of the alarm device of the current transformer of the utility model (hereinafter referred to as the alarm device). Due to the related circuit problems of the secondary winding of the low-voltage current transformer, it will generate more heat energy during operation, and the heat energy will be directly transmitted to the secondary winding of the low-voltage current transformer. In order to reduce the damage of the monitoring harness due to overheating during use, the alarm device is used to monitor the secondary winding of the current transformer and send an alarm signal when it is detected that the heat of the secondary winding is higher than the preset value.

[0027] like Figure 1 , Figure 2 As shown, the alarm device includes a monitoring harness group electrically connected to the secondary winding of the current transformer, the monitoring harness group includes a first monitoring harness 2 and a second monitoring harness 3; an alarm unit body 1, an alarm unit is arranged inside the alarm unit body 1, a first wiring terminal 7 and a second wiring terminal 9 are arranged on the alarm unit body 1, the first wiring terminal 7 is connected to the first monitoring harness 2, and the second wiring terminal 9 is connected to the second monitoring harness 3; a wiring terminal switching component is also arranged on the alarm unit body 1, the wiring harness connection end switching component switches the position of the first wiring terminal 7 and the second wiring terminal 9, so that one of the first monitoring wiring harness 2 and the second monitoring wiring harness 3 is electrically connected to the alarm unit.

[0028] In the above alarm device, the terminal switching assembly can switch the monitoring harness electrically connected to the alarm unit, so that the first monitoring harness 2 and the second monitoring harness 3 are electrically connected to the alarm unit in turn. The intermittent use of the monitoring harness group can give each monitoring line a certain cooling time to cool down, thereby effectively reducing the damage caused by overheating when the monitoring harness is in use. When the first monitoring harness 2 is electrically connected to the alarm unit, the heat energy transmitted to the first monitoring harness 2 by the secondary winding of the low-voltage current transformer and the heat energy generated when the first monitoring harness 2 transmits electrical energy will cause the temperature of the first monitoring harness 2 to rise rapidly. When the use time of the first monitoring harness 2 reaches the set time, the first monitoring harness 2 and the second monitoring harness 3 are switched through the terminal switching assembly, so that the first monitoring harness 2 and the alarm unit are powered off, and the second monitoring harness 3 and the alarm unit are electrically connected. At this time, the first monitoring harness 2 that is powered off from the alarm unit will only receive the heat energy transmitted by the secondary winding, and will automatically cool down, thereby effectively reducing the damage caused by overheating when the monitoring harness is in use.

[0029] Specifically, in an optional implementation manner, Figure 2 , Figure 3As shown, the terminal switching assembly includes a power strip 8 fixedly connected to the alarm unit; an insulating support assembly rotatably connected to the alarm unit body 1, and a rotating drive device 12 that drives the insulating support assembly to rotate between a first position and a second position. The first terminal 7 and the second terminal 9 are installed on the insulating support assembly; when the insulating support assembly is in the first position, the first terminal 7 is electrically connected to the power strip 8; when the insulating support assembly is in the second position, the second terminal 9 is electrically connected to the power strip 8. Since the first terminal 7 is electrically connected to the first monitoring harness 2, and the second terminal 9 is electrically connected to the second monitoring harness 3, the first monitoring harness 2 and the second monitoring harness 3 are intermittently electrically connected to the alarm unit.

[0030] Specifically, in an optional embodiment, the insulating support assembly includes an insulating shaft 5 drivingly connected to the output shaft of the rotating drive device 12; an insulating support sheet 6 fixedly connected to the insulating shaft 5, the first wiring terminal 7 and the second wiring terminal 9 are installed on the insulating support sheet 6, and the first wiring terminal 7 and the second wiring terminal 9 are at the same distance from the axis of the insulating shaft 5. When the insulating shaft 5 drives the insulating support sheet 6 to rotate, it will drive the two power terminals to abut against the power sheet 8 in turn, and when the power sheet 8 and the power terminals abut against each other, they are electrically connected together, thereby completing the transmission of electricity.

[0031] Specifically, in an optional embodiment, the first wiring terminal 7 and the second wiring terminal 9 respectively include: a first connection end located on the first side of the insulating support sheet 6 and a second connection end located on the second side of the insulating support sheet 6. The first connection end is electrically connected to the first monitoring harness 2 / the second monitoring harness 3, and the connection method can be plug-in, winding connection, etc. Figure 4 As shown, the second connection end includes an insulating guide ring 13 fixedly connected to the insulating support sheet 6, an insulating guide body 14 slidably connected to the insulating guide ring 13, and a conductive portion 15 fixedly connected to the insulating guide body 14 on a side away from the insulating support sheet 6, and a connecting wire 16 is inserted into the insulating guide body 14, one end of the connecting wire 16 is electrically connected to the first connection end, and the other end is electrically connected to the conductive portion 15. By adopting the sliding guide structure of the insulating guide body 14 and the insulating guide ring 13, the insulating guide body 14 can be guided so that the insulating guide body 14 is always opposite to the power connection sheet 8.

[0032] Specifically, in an optional embodiment, the conductive part 15 is a hemisphere, and the radius of the hemisphere is greater than the thickness of the power connection sheet 8. At this time, the curvature of the hemisphere allows the conductive part 15 to move smoothly to the power connection sheet 8, reducing the jamming phenomenon.

[0033] Specifically, in an optional embodiment, an elastic member 17 is provided between the insulating support sheet 6 and the insulating guide body 14, and the elastic force of the elastic member 17 is suitable for moving the insulating guide body 14 in a direction away from the insulating support sheet 6. When the conductive portion 15 and the power connection sheet 8 are opposite to each other, the conductive portion 15 is pushed by the elastic member 17, so that the conductive portion 15 and the power connection sheet 8 are closely abutted, thereby reducing the phenomenon of poor contact between the two.

[0034] Specifically, in an optional embodiment, the rotary drive device 12 is a rotary motor, and the rotary drive device 12 is connected to the insulating shaft 5 via a gear transmission assembly. The gear transmission assembly includes a first gear 10 fixedly connected to the insulating shaft 5, and a second gear 11 connected to the output shaft of the rotary drive device 12, and the first gear 10 is meshed with the second gear 11.

[0035] Specifically, in an optional embodiment, the alarm device further includes a control chip and a time relay, and the control chip controls the rotation of the rotation drive device 12 according to the set value of the time relay. Specifically, the working principle of the alarm device is as follows: first, the alarm unit is electrically connected through the first monitoring harness 2, and the heat energy transmitted to the first monitoring harness 2 by the secondary winding of the current transformer and the heat energy when the first monitoring harness 2 transmits electrical energy will cause the temperature of the first monitoring harness 2 to rise rapidly; when the use time of the first monitoring harness 2 reaches the set time, a signal is input to the control chip through the time relay, and then the start and stop and rotation direction of the rotation drive device 12 are controlled by the control chip, and the insulating support plate 6 is driven to rotate by the rotation drive device 12, so that the first terminal 7 and the power strip 8 connected to the first monitoring harness 2 are separated, so that the first monitoring harness 2 and the alarm unit are powered off, and the second terminal 9 and the power strip 8 connected to the second monitoring harness 3 are offset, so as to complete the electrical connection between the spare second monitoring harness 3 and the alarm unit.

[0036] The utility model also provides a specific implementation of a current transformer, which includes the above-mentioned alarm device, and the specific structure and working principle are not repeated here.

[0037] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present utility model.

Claims

1. An alarm device for a current transformer, characterized in that: include: A monitoring wire harness group electrically connected to the secondary winding of the current transformer, the monitoring wire harness group comprising a first monitoring wire and a second monitoring wire; An alarm unit body, wherein the alarm unit is arranged inside the alarm unit body, a first wiring terminal and a second wiring terminal are arranged on the alarm unit body, the first wiring terminal is connected to the first monitoring line, and the second wiring terminal is connected to the second monitoring line; a wiring terminal switching component is also arranged on the alarm unit body, and the wiring harness connection end switching component switches the positions of the first wiring terminal and the second wiring terminal so that one of the first monitoring line and the second monitoring line is electrically connected to the alarm unit.

2. The alarm device for a current transformer according to claim 1, characterized in that: The terminal switching assembly comprises: A power strip, fixedly connected to the alarm unit; An insulating support assembly, rotatably connected to the alarm unit body, the first wiring terminal and the second wiring terminal being mounted on the insulating support assembly; A rotation drive device drives the insulating support assembly to rotate between a first position and a second position. When the insulating support assembly is in the first position, the first terminal is electrically connected to the power connection piece; when the insulating support assembly is in the second position, the second terminal is electrically connected to the power connection piece.

3. The alarm device for a current transformer according to claim 2, characterized in that: The insulating support assembly comprises: An insulating rotating shaft, drivingly connected to the output shaft of the rotary drive device; The insulating support sheet is fixedly connected to the insulating shaft, the first wiring terminal and the second wiring terminal are installed on the insulating support sheet, and the distances from the first wiring terminal and the second wiring terminal to the axis of the insulating shaft are equal.

4. The alarm device for a current transformer according to claim 3, characterized in that: The first wiring terminal and the second wiring terminal respectively include: A first connection end located on a first side of an insulating support sheet and a second connection end located on a second side of the insulating support sheet; the first connection end is electrically connected to a monitoring harness group, the second connection end comprises an insulating guide ring fixedly connected to the insulating support sheet, an insulating guide body slidably connected to the insulating guide ring, and a conductive portion fixedly connected to the insulating guide body away from a side of the insulating support sheet, a connecting wire is inserted into the insulating guide body, one end of the connecting wire is electrically connected to the first connection end, and the other end is electrically connected to the conductive portion.

5. The alarm device for a current transformer according to claim 4, characterized in that: The conductive part is a hemisphere, and the radius of the hemisphere is greater than the thickness of the power connection sheet.

6. The alarm device for a current transformer according to claim 5, characterized in that: An elastic member is arranged between the insulating support sheet and the insulating guide body, and the elastic force of the elastic member is suitable for moving the insulating guide body in a direction away from the insulating support sheet.

7. The alarm device for a current transformer according to claim 3, characterized in that: The rotary drive device is a rotary motor, and the rotary drive device is transmission-connected to the insulating shaft via a gear transmission assembly.

8. The alarm device for a current transformer according to claim 2, characterized in that: It also includes a control chip and a time relay, and the control chip controls the rotation of the rotary drive device according to the set value of the time relay.

9. A current transformer, characterized in that: The invention comprises the alarm device described in any one of claims 1 to 8.

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