CN210867163U - Overcurrent protection circuit, electric cabinet and electric equipment - Google Patents
Overcurrent protection circuit, electric cabinet and electric equipment Download PDFInfo
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- CN210867163U CN210867163U CN201921800733.8U CN201921800733U CN210867163U CN 210867163 U CN210867163 U CN 210867163U CN 201921800733 U CN201921800733 U CN 201921800733U CN 210867163 U CN210867163 U CN 210867163U
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Abstract
The application discloses overcurrent protection circuit, electric cabinet and consumer. Wherein the overcurrent protection circuit includes: a main controller; the first phase line is used for supplying power and is connected with the main controller; the first overcurrent breaker is arranged on the first phase line; the current transformer is arranged on the first phase line; the current transformer is connected with the main controller and used for inducing the current of the first phase line and sending the current to the main controller, so that the main controller triggers over-current protection when the current is over-current. Compared with the prior art, when the first overcurrent breaker cannot act in time, the current transformer can sense and trigger overcurrent protection in time, the safety is greatly improved, and the damage to the electric equipment caused by overcurrent is avoided, so that the reliability is improved.
Description
Technical Field
The application relates to the technical field of electric cabinets, in particular to an overcurrent protection circuit, an electric cabinet and electric equipment.
Background
At present, the control of a plurality of large-scale equipment can not be separated from an independent electric cabinet, along with the application of the electric cabinet is more and more common, people pay more and more attention to the safety of the electric cabinet, and the safe operation of the electric cabinet is a guarantee for the normal operation of the equipment. In the common fault types of the electric cabinet, the internal devices, the internal circuits and even the whole electric cabinet are particularly common because of the over-current. In the related art, the design of the electric cabinet usually only has overcurrent protection of devices such as a circuit breaker and the like, but the device can quickly respond to overcurrent protection only in the instant overcurrent, and when overcurrent faults occur, if the devices are insensitive to motion, major safety events such as device burnout and line burnout can occur.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an overcurrent protection circuit, an electric cabinet and electric equipment so as to solve the problem that in the related art, overcurrent protection actions of devices such as a circuit breaker are insensitive and unsafe in time.
The purpose of the application is realized by the following technical scheme:
an overcurrent protection circuit for use in an electrical cabinet, the overcurrent protection circuit comprising:
a main controller;
the first phase line is used for supplying power and is connected with the main controller;
the first overcurrent breaker is arranged on the first phase line;
the current transformer is arranged on the first phase line;
the current transformer is connected with the main controller and used for inducing the current of the first phase line and sending the current to the main controller, so that the main controller triggers over-current protection when the current is over-current.
Optionally, the first phase line is connected to the main controller through a transformer;
the current transformer is arranged on one side of the transformer, which is connected with the first phase line.
Optionally, the current transformer is located between the transformer and the first overcurrent breaker.
Optionally, the phase sequence protector, the second phase line and the third phase line are further included; the phase sequence protector is provided with a normally open contact switch;
the phase sequence protector is characterized in that a first phase line end of the phase sequence protector is connected with the first phase line, a second phase line end of the phase sequence protector is connected with the second phase line, a third phase line end of the phase sequence protector is connected with the third phase line, and a normally open contact switch is arranged on the first phase line.
Optionally, the device further comprises a central line and an indicator light; one end of the indicator light is connected with the neutral line, and the other end of the indicator light is connected with the first phase line.
Optionally, one end of the indicator light is connected to the neutral line through a fuse, or the other end of the indicator light is connected to the first phase line through a fuse.
Optionally, the host controller comprises a DDC.
An electric cabinet comprises an electric cabinet main body and the overcurrent protection circuit arranged on the electric cabinet main body.
Optionally, an electric cabinet door is arranged on the electric cabinet main body; and a manual operator connected with the main controller is arranged on the electric control box door.
An electric consumer comprising an electric cabinet as described above.
This application adopts above technical scheme, has following beneficial effect:
in the overcurrent protection circuit of the present application, on the one hand, a first overcurrent breaker is provided on the first phase line supplying power, and when an instantaneous overcurrent occurs, the power supply can be cut off by the first overcurrent breaker to realize overcurrent primary protection, on the other hand, a current transformer is also arranged on the first phase line, the current transformer can induce the current on the first phase line, send the induced current to the main controller at any time, if the induced current is over-current, trigger the main controller to perform over-current protection, which is equivalent to adding a layer of over-current protection to realize multiple over-current protection, compared with the related art, when the first overcurrent breaker cannot act in time, the current transformer can sense and trigger overcurrent protection in time, the safety is greatly improved, and the damage to the electric equipment caused by overcurrent is avoided, so that the reliability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an overcurrent protection circuit according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of an overcurrent protection circuit according to another embodiment of the present application.
Fig. 3 is a schematic partial structural diagram of an electric cabinet according to another embodiment of the present application.
Fig. 4 is a schematic partial structural diagram of an electric cabinet according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
At present, the control of a plurality of large-scale equipment can not be separated from an independent electric cabinet, along with the application of the electric cabinet is more and more common, people pay more and more attention to the safety of the electric cabinet, and the safe operation of the electric cabinet is a guarantee for the normal operation of the equipment. In the common fault types of the electric cabinet, the internal devices, the internal circuits and even the whole electric cabinet are particularly common because of the over-current. In the related art, the design of the electric cabinet usually only has overcurrent protection of devices such as a circuit breaker and the like, but the device can quickly respond to overcurrent protection only in the instant overcurrent, and when overcurrent faults occur, if the devices are insensitive to motion, major safety events such as device burnout and line burnout can occur. In order to solve the above technical problem, the present application provides the following solutions, which are described in detail below.
Examples
Referring to fig. 1, fig. 1 is a schematic structural diagram of an overcurrent protection circuit according to an embodiment of the present application.
As shown in fig. 1, the present embodiment provides an overcurrent protection circuit applied in an electrical control box, the overcurrent protection circuit including:
a main controller 101;
a first phase line 102 for supplying power, connected to the main controller 101;
a first overcurrent breaker 103 arranged on the first phase line 102;
a current transformer 104 disposed on the first phase line 102;
the current transformer 104 is connected to the main controller 101, and configured to sense a current of the first phase line 102 and send the current to the main controller 101, so that the main controller 101 triggers an overcurrent protection when the current is overcurrent.
It should be noted that, how to trigger the overcurrent protection through the received current is an existing mature technology, the present application may refer to the implementation directly, for example, when the current is greater than a first preset value, it is considered that the overcurrent is instantaneously triggered, and the overcurrent protection needs to be triggered, and for example, when the current is continuously preset for a time period greater than a second preset value (less than the first preset value), it is considered that the overcurrent is long, and the overcurrent protection needs to be triggered. Typical overcurrent protection actions include shutdown and the like.
In the overcurrent protection circuit of the application, on one hand, a first overcurrent breaker 103 is arranged on a first phase line 102 for supplying power, when instant overcurrent occurs, the power supply can be cut off through the first overcurrent breaker 103 to realize overcurrent primary protection, on the other hand, a current transformer 104 is also arranged on the first phase line 102, the current transformer 104 can induce the current on the first phase line 102 and send the induced current to a main controller 101 at any time, if the induced current is overcurrent, the main controller 101 is triggered to perform overcurrent protection, namely, a layer of overcurrent protection is added to realize multiple overcurrent protection, compared with the related technology, when the first overcurrent breaker 103 cannot act in time, the current transformer 104 can induce and trigger the overcurrent protection in time, the safety is greatly improved, and the damage to electric equipment caused by the overcurrent is avoided, thereby improving reliability.
It will be appreciated that, as shown in fig. 2, the first phase line 102 is connected to the main controller 101 through a transformer 114, and the transformer 114 converts the power provided by the first phase line 102 into the power required by the main controller 101. Accordingly, the current transformer 104 is disposed on the side of the transformer 114 connected to the first phase line 102, so that the overcurrent protection is faster and more accurate by disposing the current transformer 104 on the side of the power input. Further, to ensure a fast response, the current transformer 104 is located between the transformer 114 and the first over-current breaker 103.
The current transformer 104 may be of various types, and specifically, the types that may be used may include, but are not limited to, LMZJ 1-0.550/5A.
The first overcurrent breaker 103 can be in various models, and specifically, the model that can be adopted can include, but is not limited to, A9F 29310.
To further increase safety, in some embodiments, optionally, the overcurrent protection circuit may further include a phase sequence protector 105, a second phase line 108, and a third phase line 109; the phase sequence protector 105 has a normally open contact switch 1051; the phase sequence protector 105 has a first phase line end connected to the first phase line 102, a second phase line end connected to the second phase line 108, a third phase line end connected to the third phase line 109, and a normally open contact switch 1051 disposed on the first phase line 102. The phase sequence protector 105 can detect whether the phase sequence of the circuit is correct, and if the phase sequence is incorrect, the normally open contact switch 1051 is closed, the first phase line 102 is disconnected, and therefore the power supply is disconnected, and safety protection is performed.
The phase sequence protector 105 may be of various types, and specifically, the type that can be used may include, but is not limited to, BPB 01.
The second phase line 108 may also be provided with a second overcurrent breaker 106, so as to further realize overcurrent protection and improve safety. Similarly, a third overcurrent breaker 107 may be disposed on the third phase line 109, so as to further implement overcurrent protection.
In some embodiments, optionally, the overcurrent protection circuit further includes a neutral line 110 and an indicator light 111; one end of the indicator 111 is connected to the neutral line 110, and the other end is connected to the first phase line 102. In this way, the operation is indicated by the indicator lamp 111 and is lighted during operation. Optionally, one end of the indicator 111 is connected to the neutral line 110 through a fuse 112, or the other end of the indicator 111 is connected to the first phase line 102 through a fuse 112. Thus, the indicator lamp 111 is connected in series with the protective tube 112, thereby further realizing overcurrent safety protection.
The host controller 101 may be of various types, and may include, but is not limited to, a Direct Digital Control (DDC), and a specific model may be POL 638.
The specific structure of an overcurrent protection circuit according to the embodiment of the present application will be described in more detail below by taking a main controller of POL638 as an example.
A model POL638 DDC host controller may provide a data input X1, a common M, a hand operator connection port T-H1, a first power input 0V, a second power input 24V, and so on.
In an application scenario of this embodiment, the electric cabinet includes an electric cabinet main body, as shown in fig. 3, a circuit board 113 is disposed in the electric cabinet main body, a wire slot 1131 is disposed on the circuit board 113, and a part of the overcurrent protection circuit may be disposed on the circuit board 113.
In this embodiment, the overcurrent protection circuit includes the main controller 101, the first phase line 102, the second phase line 108, the third phase line 109, the neutral line 110, the first overcurrent breaker 103, the second overcurrent breaker 106, the third overcurrent breaker 107, the transformer 114, the current transformer 104, the phase sequence protector 105, the fuse 112, and the indicator 111.
The main controller 101, the first overcurrent breaker 103, the second overcurrent breaker 106, the third overcurrent breaker 107, the transformer 114, the current transformer 104 and the phase sequence protector 105 are arranged on a circuit board 113. The circuit board 113 is provided with a terminal board 115, and the first phase line 102, the second phase line 108, the third phase line 109 and the neutral line 110 are connected to the first phase line terminal L1, the second phase line terminal L2, the third phase line terminal L3 and the neutral line terminal N on the ac power supply side through the terminal board 115 in a one-to-one correspondence. Further, a ground terminal PE on the ac power supply side is grounded.
In addition, the electric cabinet main body is further provided with an electric cabinet door, and as shown in fig. 4, the electric cabinet door 117 is provided with the above hand operator 116 and the indicator lamp 111 connected with the main controller 101.
Based on this, as shown in fig. 2, the specific structure of the overcurrent protection circuit provided in this embodiment is as follows:
a first end of the first phase line 102 is connected to a first phase line terminal L1 on the ac power supply side via a terminal block 115, and a second end is connected to a first end of the primary winding I of the transformer 114; the first overcurrent breaker 103, the current transformer 104 and the normally open contact switch 1051 of the phase sequence protector 105 are further sequentially arranged on the first phase line 102 and between the wiring board 115 and the transformer 114.
The second phase wire 108 has a first end connected to a second phase wire terminal L2 on the ac power supply side via a terminal block 115, and a second end connected to a second phase wire terminal of the phase sequence protector 105 via a second overcurrent breaker 106.
The third phase line 109 has a first end connected to a third phase line terminal L3 on the ac power supply side via a terminal block 115, and a second end connected to a third phase line terminal of the phase sequence protector 105 via a third overcurrent breaker 107.
A first phase terminal of the phase sequence protector 105 is connected to the first phase 102 between the first excess current breaker 103 and the current transformer 104.
The fuse 112 is connected at a first end to the first phase line 102 between the terminal block 115 and the first excess current breaker 103 via the indicator lamp 111 and at a second end to the neutral line 110.
The second terminal of the primary winding I of the transformer 114 is connected to the neutral line 110, the first terminal of the secondary winding II is connected to the 24V terminal of the main controller 101, and the second terminal is connected to the 0V terminal of the main controller 101.
The transformer 114 can convert the 0-220V power into 0-24V power.
The first output terminal S1 of the current transformer 104 is connected to the terminal X1 of the main controller 101, and the second output terminal S2 is connected to the terminal M of the main controller 101, which is also connected to ground.
The hand operator connection end T-H1 of the main controller 101 is connected to the hand operator 116, and the hand operator 116 may be a liquid crystal touch screen for displaying and controlling the operation of the device.
Multiple overcurrent protection can be realized through the structure.
Another embodiment of the present application further provides an electric cabinet, which includes an electric cabinet main body, and the overcurrent protection circuit provided on the electric cabinet main body as described in any of the above embodiments.
Optionally, an electric cabinet door is arranged on the electric cabinet main body; and a manual operator connected with the main controller is arranged on the electric control box door.
For a specific implementation of the electric cabinet provided in the embodiment of the present application, reference may be made to the implementation of the overcurrent protection circuit described in any of the above examples, and details are not described here.
Another embodiment of the present application further provides an electric device, including the electric cabinet according to any of the above embodiments.
The specific implementation of the electric equipment provided in the embodiment of the present application may refer to the implementation of the electric cabinet described in any of the above examples, and details are not described here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. An overcurrent protection circuit, applied to an electric control box, comprising:
a main controller;
the first phase line is used for supplying power and is connected with the main controller;
the first overcurrent breaker is arranged on the first phase line;
the current transformer is arranged on the first phase line;
the current transformer is connected with the main controller and used for inducing the current of the first phase line and sending the current to the main controller, so that the main controller triggers over-current protection when the current is over-current.
2. The overcurrent protection circuit as recited in claim 1 wherein the first phase line is connected to the main controller through a transformer;
the current transformer is arranged on one side of the transformer, which is connected with the first phase line.
3. The overcurrent protection circuit of claim 2 wherein the current transformer is located between the transformer and the first overcurrent breaker.
4. The overcurrent protection circuit of claim 1, further comprising a phase sequence protector, a second phase line, and a third phase line; the phase sequence protector is provided with a normally open contact switch;
the phase sequence protector is characterized in that a first phase line end of the phase sequence protector is connected with the first phase line, a second phase line end of the phase sequence protector is connected with the second phase line, a third phase line end of the phase sequence protector is connected with the third phase line, and a normally open contact switch is arranged on the first phase line.
5. The overcurrent protection circuit of claim 1 further comprising a neutral line and an indicator light; one end of the indicator light is connected with the neutral line, and the other end of the indicator light is connected with the first phase line.
6. The overcurrent protection circuit as recited in claim 5, wherein one end of said indicator light is connected to said neutral line through a fuse, or wherein the other end of said indicator light is connected to said first phase line through a fuse.
7. The overcurrent protection circuit of claim 5 wherein the main controller comprises a DDC.
8. An electric cabinet, characterized by comprising an electric cabinet main body and the overcurrent protection circuit as set forth in any one of claims 1 to 7 provided on the electric cabinet main body.
9. The electric cabinet according to claim 8, wherein the electric cabinet main body is provided with an electric cabinet door; and a manual operator connected with the main controller is arranged on the electric control box door.
10. An electric consumer, characterized in that it comprises an electric cabinet according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921800733.8U CN210867163U (en) | 2019-10-24 | 2019-10-24 | Overcurrent protection circuit, electric cabinet and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921800733.8U CN210867163U (en) | 2019-10-24 | 2019-10-24 | Overcurrent protection circuit, electric cabinet and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210867163U true CN210867163U (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921800733.8U Active CN210867163U (en) | 2019-10-24 | 2019-10-24 | Overcurrent protection circuit, electric cabinet and electric equipment |
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| Country | Link |
|---|---|
| CN (1) | CN210867163U (en) |
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2019
- 2019-10-24 CN CN201921800733.8U patent/CN210867163U/en active Active
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