CN219372027U

CN219372027U - Low-voltage reactive compensation switching switch

Info

Publication number: CN219372027U
Application number: CN202223497211.XU
Authority: CN
Inventors: 步显彬; 李亚惠; 李东冰
Original assignee: Shenyang Huifeng Electric Power Automation Co ltd
Current assignee: Shenyang Huifeng Electric Power Automation Co ltd
Priority date: 2022-12-27
Filing date: 2022-12-27
Publication date: 2023-07-18
Anticipated expiration: 2032-12-27

Abstract

The utility model relates to a low-voltage reactive compensation on-off switch, which comprises a box body, a thyristor controlled silicon and a triggering device, wherein the thyristor controlled silicon and the triggering device are arranged in the box body; the thyristor controlled silicon inlet end is connected with an external power supply, the outlet end is connected with a power grid system, and the thyristor controlled silicon is also connected with a triggering device. The trigger device is used for receiving an external trigger signal, comparing the trigger signal with a power grid signal, when the power grid signal reaches a zero position, the trigger device triggers the thyristor, so that an NPN junction or a PNP junction inside the thyristor is conducted or closed, the effect of fast switching is achieved, and no inrush current exists in the switching process, so that the influence of the inrush current on a power grid system is effectively avoided, and the service life of the power grid system is prolonged.

Description

Low-voltage reactive compensation switching switch

Technical Field

The utility model relates to the technical field of switch-off switches, in particular to a low-voltage reactive compensation switching switch.

Background

The existing low-voltage reactive compensation switching switch in China generally adopts contactors, compound switches or thyristors in the conventional mode.

When the contactor is used as a switching switch, in the switching process of the contactor, the power grid voltage is not zero or is in a high peak value at the moment of closing the contact, so that a closing surge is caused. Experiments show that the switching-on inrush current can be up to 50 times of rated current of the capacitor, which not only affects the service lives of the capacitor and the contactor, but also can impact a power grid to affect the normal operation of other equipment. In order to reduce the switching on current, the current limiting resistor is added in the loop to control the switching on current, and the switching on current can be controlled within 20 times of rated current, but the accident rate is still high and the maintenance cost is high from the long-term operation condition.

And secondly, when the composite switch is used as a reactive compensation switching switch, the composite switch is formed by connecting an alternating current contactor and a controllable silicon in parallel, and when the composite switch is conducted, the thyristor is utilized to realize surge-free current switching. After the switching is completed, the main circuit of the AC contactor is closed and exits the thyristor. Because of the mutual limitation between the alternating-current contactor and the thyristor, the compound switch cannot obtain large on-state current, the reverse withstand voltage can only reach 1600V, the switching process is complex, the thyristor is frequently disconnected and is easy to hit, and the abrasion can lead to higher failure rate.

And when the thyristor in the traditional form is used as a switching switch, the switching switch has the advantages of large integral size, small power, complex installation and maintenance and poor integral aesthetic degree.

Disclosure of Invention

First, the technical problem to be solved

In view of the above-mentioned shortcomings and disadvantages of the prior art, the utility model provides a low-voltage reactive compensation switching switch, which solves the technical problems of short service life, high failure rate, large whole volume, small power and complex installation and maintenance caused by adopting a contactor, a compound switch and a traditional thyristor controlled silicon as a switching switch in the prior art.

(II) technical scheme

In order to achieve the purpose, the utility model provides a low-voltage reactive compensation switching switch, which comprises the following specific technical scheme:

a low-voltage reactive compensation on-off switch comprises a box body, a thyristor controlled silicon and a triggering device, wherein the thyristor controlled silicon and the triggering device are arranged in the box body;

the thyristor controllable silicon inlet end is connected with an external power supply, and the outlet end is connected with a power grid system;

the thyristor controlled silicon is also connected with the triggering device.

Further, the number of the thyristors is 2, and the thyristors comprise an A-phase thyristor and a C-phase thyristor which are connected in parallel;

the trigger device is connected with the A-phase thyristor controlled silicon and the C-phase thyristor controlled silicon respectively.

Further, the heat radiator is also included;

the heat dissipation device is in heat conduction connection with the thyristor controlled silicon and is used for dissipating heat of the thyristor controlled silicon.

Further, the heat dissipating device comprises a heat dissipating fin and a heat dissipating fan;

the radiating fan is arranged in the box body and used for spraying air flow to the radiating fin, and the radiating fin is connected with the thyristor through heat conduction.

Further, the heat dissipation device also comprises a temperature detection device;

the temperature detection device is arranged on the radiating fin and is electrically connected with the radiating fan.

Further, a power supply indicating device and an operation indicating device are also arranged on the box body, 2 observation windows are correspondingly arranged on the front cover plate of the box body, and the 2 observation windows are respectively connected with the power supply indicating device and the operation indicating device;

the power supply indicating device is connected with an external power supply, and the operation indicating device is connected with the thyristor controlled silicon.

Preferably, the power supply indicating device and the operation indicating device are any one of a character indicating device and a light indicating device.

Further, the box body is also provided with a threading hole, and the threading hole is arranged on the back plate of the box body.

Further, a signal interface is also arranged on the box body, and the signal interface is a terminal interface and is respectively connected with the triggering device and the radiating extension.

Further, the box body is also provided with a plurality of radiating holes, and the radiating holes are used for radiating heat of the box body.

(III) beneficial effects

The low-voltage reactive compensation switching switch provided by the utility model fills the blank of the prior art.

According to the utility model, the thyristor controlled silicon and the triggering device are arranged, wherein the triggering device is used for receiving an external triggering signal, comparing the triggering signal with a power grid signal, and when the power grid signal reaches a zero position, the triggering device triggers the thyristor controlled silicon to enable an NPN junction or a PNP junction in the thyristor controlled silicon to be conducted or closed, so that the effect of rapid switching is achieved, and no inrush current exists in the switching process, so that the influence of the inrush current on a power grid system is effectively avoided, and the service life of the power grid system is prolonged. In the utility model, the thyristor controlled silicon is used as a contactless switch, and the thyristor controlled silicon has no arcing in the switching process, thereby effectively avoiding the danger of arc re-burning.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation on the application, in which:

FIG. 1 is a front view of a low voltage reactive compensation on-off switch in an embodiment;

FIG. 2 is a schematic diagram of the internal structure of a low-voltage reactive compensation on-off switch in an embodiment;

FIG. 3 is a rear view of a low voltage reactive compensation on-off switch in an embodiment;

fig. 4 is a top view of a low voltage reactive compensation on-off switch in an embodiment.

[ reference numerals description ]

1. A case; 2. a heat radiation fan; 3. a heat sink; 4. a thyristor controlled silicon; 5. a triggering device; 6. a heat radiation hole; 7. a box body mounting hole; 8. a threading hole; 9. an exhaust hole of the fan; 10. a signal interface; 11. and an observation window.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the preferred embodiments of the present utility model will be described in more detail with reference to the accompanying drawings in the preferred embodiments of the present utility model. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the utility model. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

In the description of the present embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present embodiment and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present embodiment.

Referring to fig. 1, the embodiment provides a low-voltage reactive compensation switching switch, which comprises a box body 1, a thyristor controlled silicon 4 arranged in the box body 1 and a triggering device 5. The wire inlet end of the thyristor controlled silicon 4 is connected with an external power supply through a cable, and the wire outlet end is connected with a power grid system through a cable. The thyristor controlled silicon 4 is also connected with the triggering device 5, the triggering device 5 is used for receiving an external triggering signal and comparing the received triggering signal with a power grid signal detected by the triggering device 5, when the power grid signal reaches a zero position, the triggering device 5 controls the thyristor controlled silicon 4 to trigger, so that an NPN junction or a PNP junction in the thyristor controlled silicon 4 is turned on or off, the purpose of quick switching is achieved, quick switching of a power grid system is further achieved, no surge and overvoltage are generated in the switching process, and damage of the surge current and overvoltage to the power grid system is effectively avoided.

It can be understood that the low-voltage reactive compensation switching switch of this embodiment adopts zero-crossing triggering technology, and the power grid signal of the power grid system is detected in real time through the triggering device 5, and the power grid signal is compared with the received external triggering signal, when the power grid signal crosses zero, the thyristor controlled silicon 4 is triggered through the triggering device 5, the switching speed is fast, and no inrush current and overvoltage are generated in the switching process, so that the capacitor in the power grid system can be rapidly cut off, and the influence of the inrush current and the overvoltage on the capacitor is avoided.

In the embodiment of the disclosure, the number of the thyristors 4 is 2, and the thyristors comprise an A-phase thyristor and a C-phase thyristor which are connected in parallel, so that when one thyristor 4 fails, the normal use of the other thyristor 4 is not influenced, and the switching use of the low-voltage reactive compensation switching switch is further ensured.

It can be understood that the thyristor controlled silicon 4 of the embodiment is used as a contactless switch, the thyristor controlled silicon 4 has no arc discharge and no mechanical contact in the switching process, and the danger of arc reignition can be effectively avoided.

In this embodiment, as shown in fig. 3, the box 1 is further provided with a threading hole 8, the threading hole 8 is used for inserting a cable, the threading hole 8 is located on the back plate of the box 1, the number is multiple, the threading hole is respectively used for inserting an incoming cable and an outgoing cable of the a-phase thyristor and the C-phase thyristor, the cable is hidden at the rear side of the box 1, and cannot be seen from the front side of the box 1, so that the box 1 has the effects of convenience in installation and overall attractive appearance.

Further, the low-voltage reactive compensation switching switch of the embodiment further comprises a heat dissipation device, wherein the heat dissipation device is connected with an external power supply and is in heat conduction connection with the thyristor controlled silicon 4, and is used for dissipating heat of the thyristor controlled silicon 4.

Specifically, the heat dissipating device of the present embodiment includes a heat dissipating fan 2 and a heat dissipating fin 3. The heat dissipation fan 2 is used for spraying gas to the heat dissipation fins 3, the heat dissipation fins 3 are connected with the thyristor controlled silicon 4 in a heat conduction mode, heat generated by the thyristor controlled silicon 4 is transferred to the heat dissipation fins 3 in a heat conduction mode, and the flowing gas takes away the heat on the heat dissipation fins 3, so that the heat dissipation effect is achieved.

Further, the heat dissipating device further comprises a temperature detecting device, and the temperature detecting device is arranged on the heat dissipating fin 3 and is electrically connected with the heat dissipating fan 2. The temperature detection device is used for detecting the temperature of the radiating fins 3, and when the detected temperature exceeds a set value, the radiating fan 2 is controlled to start to radiate heat. According to the embodiment, the intelligent control of the heat dissipation fan 2 is realized by setting the temperature detection device, and when the temperature is lower than a set value, the heat dissipation fan 2 does not need to be started, so that the energy consumption of the low-voltage reactive compensation on-off switch is greatly reduced.

As an example, the temperature detection device is a temperature sensor, and can accurately sense the temperature change of the thyristor controlled silicon 4, so as to accurately control the start and stop of the heat dissipation fan 2.

In this disclosed embodiment, still be provided with fan exhaust hole 9 on the box 1, fan exhaust hole 9 locates on the backplate of box 1, and the size of fan exhaust hole is greater than the diameter setting of radiator fan 2, and the air current of the jetting of radiator fan 2 of being convenient for flows out box 1 to form the air current that flows, and then dispel the heat to the components and parts in the box 1, in order to ensure the long-term stable work of the low-voltage reactive compensation on-off switch of this embodiment.

Further, as shown in fig. 2, the low-voltage reactive compensation switching switch of this embodiment further includes a power supply indicating device and an operation indicating device, and two observation windows 11 are correspondingly disposed on the front cover plate of the box body 1, where the two observation windows 11 respectively correspond to the power supply indicating device and the operation indicating device.

When the low-voltage reactive compensation switching switch of the embodiment is connected with the external power supply, the power supply indicating device prompts that the power supply is on so that an operator can perform related operation.

The power supply indication device of the embodiment can be light indication or text indication, and is convenient for operators to check. As the preferable scheme, the power supply indicating device is an LED indicating lamp, and when an external power supply is communicated, the LED indicating lamp is lightened, so that an operator can conveniently check the power supply from an observer.

In this embodiment, the operation indicating device is connected to the thyristor 4, and when the thyristor 4 is triggered, the operation indicating device indicates that the thyristor 4 is operating. The operation indicating device corresponds to the A-phase thyristor controlled silicon and the C-phase thyristor controlled silicon respectively, and can display the operation states of the two thyristors 4 respectively.

The operation indicating device can be a text display device or a light display device, and as a preferable scheme, the operation indicating device is a light indicating device and comprises 4 LED lamps which are distributed in an upper row and a lower row. The upper row of 2 LED lamps is used for indicating the running state of the A-phase thyristor controlled silicon, and the lower row of 2 LED lamps is used for indicating the running state of the C-phase thyristor controlled silicon. When the A-phase thyristor and the C-phase thyristor are triggered normally, 4 LED indicator lamps are turned on simultaneously; when the A-phase thyristor controlled silicon is triggered normally and the C-phase thyristor controlled silicon is not triggered abnormally, the upper row of 2 LED indicator lamps are lighted, and the lower row of 2 LED indicator lamps are not lighted; similarly, when the C-phase thyristor is normally triggered and the A-phase thyristor is abnormally not triggered, the lower row of 2 LED indicator lamps are lighted, and the upper row of two LED indicator lamps are not lighted, so that an operator is prompted as to which phase thyristor 4 fails, and the operator can conveniently replace and maintain the LED indicator lamps.

In this embodiment, the triggering device 5 receives an external triggering signal through the signal interface 10, and the signal interface 10 is a 6-terminal interface. The front 2-bit terminal is used for guiding an external trigger signal to the trigger device 5, so that the trigger device 5 triggers the thyristor controlled silicon 4. The middle two-bit terminal is used for being externally connected with an AC380V indicator lamp, so that the working state of the low-voltage reactive compensation switching switch can be more intuitively observed; the last two terminals are used for connecting an AC220V power supply which is used for providing working power for the triggering device 5 and the cooling fan 2 in the box body 1.

Further, as shown in fig. 1 to 4, the front cover plate, the back plate and the two side plates of the box body 1 in this embodiment are respectively provided with a heat dissipation hole 6, and the heat dissipation holes 6 are used for helping the low-voltage reactive compensation on-off switch to achieve the effect of rapid heat dissipation and temperature reduction, so that the low-voltage reactive compensation on-off switch can work stably for a long time.

In this embodiment, as shown in fig. 3, the installation mode of the box 1 is wall-mounted installation, the backboard of the box 1 is correspondingly provided with a box installation hole 7, the box installation hole 7 is used for inserting a screw, and the low-voltage reactive compensation on-off switch of this embodiment is fixed to a corresponding position through the screw, so that the installation is quick and the maintenance is convenient.

The above-mentioned specific structure of the low-voltage reactive compensation switching switch of this embodiment adopts zero-crossing triggering technology, through setting up trigger device 5 and thyristor controlled silicon 4, trigger device 5 with thyristor controlled silicon 4 fast to reach the purpose of quick switching, and the production of no inrush current and overvoltage in the switching process, thereby effectively avoid the influence of inrush current and overvoltage to the electric wire netting system.

Secondly, the thyristor controlled silicon 4 of the embodiment is a contactless switch, has no mechanical contact, has no arc reignition in the switching process, can rapidly cut off a power grid system, has no overvoltage, and is safe and reliable.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art who is skilled in the art to which the present utility model pertains will appreciate that the technical scheme and the inventive concept according to the present utility model are equally substituted or changed within the scope of the present utility model.

Claims

1. The low-voltage reactive compensation switching switch is characterized by comprising a box body (1), a thyristor controlled silicon (4) and a triggering device (5), wherein the thyristor controlled silicon (4) and the triggering device (5) are arranged in the box body (1);

the inlet end of the thyristor controlled silicon (4) is connected with an external power supply, and the outlet end of the thyristor controlled silicon is connected with a power grid system;

the thyristor controlled silicon (4) is also connected with the triggering device (5).

2. The low-voltage reactive compensation switching switch according to claim 1, characterized in that the number of thyristors (4) is 2, comprising a-phase thyristor and C-phase thyristor connected in parallel with each other;

the triggering device (5) is connected with the A-phase thyristor controlled silicon and the C-phase thyristor controlled silicon respectively.

3. The low voltage reactive compensation switching switch of claim 1, further comprising a heat sink;

the heat dissipation device is connected with the thyristor (4) in a heat conduction way and is used for dissipating heat of the thyristor (4).

4. A low voltage reactive compensation switching switch according to claim 3, characterized in that the heat sink comprises a heat sink (3) and a heat sink fan (2);

the radiating fan (2) is arranged in the box body (1) and used for blowing air flow to the radiating fins (3), and the radiating fins (3) are connected with the thyristor controlled silicon (4) in a heat conduction mode.

5. The low voltage reactive compensation switching switch of claim 4, wherein said heat sink means further comprises temperature sensing means;

the temperature detection device is arranged on the radiating fin (3) and is electrically connected with the radiating fan (2).

6. The low-voltage reactive compensation switching switch according to claim 1, wherein a power supply indicating device and an operation indicating device are further arranged on the box body (1), 2 observation windows (11) are correspondingly arranged on a front cover plate of the box body (1), and the 2 observation windows (11) are respectively connected with the power supply indicating device and the operation indicating device;

the power supply indicating device is connected with the external power supply, and the operation indicating device is connected with the thyristor controlled silicon (4).

7. The low voltage reactive compensation switching switch of claim 6, wherein the power indication means and the run indication means are any one of a text indication means or a light indication means.

8. The low-voltage reactive compensation switching switch according to claim 1, wherein a threading hole (8) is further arranged on the box body (1), and the threading hole (8) is arranged on a back plate of the box body (1).

9. The low-voltage reactive compensation switching switch according to claim 4, wherein the box body (1) is further provided with a signal interface (10), and the signal interface (10) is a terminal interface and is respectively connected with the triggering device (5) and the heat dissipation fan (2).

10. The low-voltage reactive compensation switching switch according to any one of claims 1 to 9, characterized in that a plurality of heat dissipation holes (6) are further provided on the case (1), and a plurality of the heat dissipation holes (6) are used for dissipating heat from the case (1).