CN218896586U - Knife switch - Google Patents
Knife switch Download PDFInfo
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- CN218896586U CN218896586U CN202223058585.1U CN202223058585U CN218896586U CN 218896586 U CN218896586 U CN 218896586U CN 202223058585 U CN202223058585 U CN 202223058585U CN 218896586 U CN218896586 U CN 218896586U
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- knife switch
- fixed contact
- electric energy
- microprocessor
- current transformer
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Abstract
The present utility model provides a knife switch comprising: the device comprises a bottom plate and a current transformer, wherein the bottom plate is provided with an incoming line fixed contact, an outgoing line fixed contact and a moving contact blade, the bottom plate is provided with a fixed slot, the current transformer passes through the fixed contact and is installed in the fixed slot, the incoming line fixed contact is electrically connected with an incoming line of a knife switch, and the outgoing line fixed contact is electrically connected with an outgoing line of the knife switch; the movable contact blade is suitable for rotating around a hinge point, has a conducting state in contact with the incoming line fixed contact and a disconnecting state arranged at intervals with the incoming line fixed contact, and the hinge point is connected with the outgoing line fixed contact; and the current transformer is electrically connected with the outgoing line static contact and is used for collecting current signals of the knife switch. According to the knife switch provided by the utility model, the current transformer is arranged on the bottom plate of the knife switch to collect the current signal of the knife switch, so that the limitation of the space and the product size requirement of the box body of the knife switch is avoided, and the convenience of measuring the current is improved.
Description
Technical Field
The utility model relates to the field of knife switches, in particular to a knife switch.
Background
The knife switch is also called a knife switch or an isolating switch, and can play a role of isolating a power supply in a circuit so as to ensure the safety of the circuit and equipment. In the branch box and the grid-connected box, the knife switch is widely applied because of having obvious disconnection points and being convenient to operate.
In the prior art, a current value passing through a knife switch is measured by adding a mutual inductor to the knife switch, and an outgoing line end of the knife switch is externally connected with a lead to be connected with the mutual inductor. However, the space and product size requirements of the knife switch box body are high in a mode of adding the mutual inductor, and the product miniaturization design is not utilized.
Disclosure of Invention
Therefore, the technical problem to be solved by the utility model is to overcome the problems that the space and the product size of the box body of the knife switch are high in the mode of adding the mutual inductor in the prior art, and the miniaturization design of the product is not utilized, so that the knife switch is provided.
According to a first aspect, the present utility model provides a knife switch comprising: the base plate is provided with an incoming line fixed contact, an outgoing line fixed contact and a moving contact blade, the base plate is provided with a fixed slot, the current transformer passes through the fixed contact and is arranged in the fixed slot, wherein,
the incoming line fixed contact is electrically connected with an incoming line of the knife switch, and the outgoing line fixed contact is electrically connected with an outgoing line of the knife switch;
the movable contact blade is suitable for rotating around a hinge point and is provided with a conducting state in contact with the incoming line fixed contact and a disconnecting state arranged at intervals with the incoming line fixed contact, and the hinge point is connected with the outgoing line fixed contact;
the current transformer passes through the outgoing line fixed contact and is used for collecting current signals of the knife switch.
In an embodiment, further comprising: the knife switch further comprises: and the input end power supply of the voltage dividing circuit is connected with the fixed contact end.
In an embodiment, the knife switch further comprises: an electric energy metering chip and a microprocessor, wherein,
the electric energy metering chip is connected to the current transformer and the first output end of the voltage dividing circuit and is used for generating corresponding pulse signals according to current signals acquired by the current transformer and voltage signals output by the voltage dividing circuit;
the microprocessor is connected with the electric energy metering chip and calculates the electric energy value of the knife switch according to the pulse signal;
and the output end of the voltage dividing circuit is used for supplying power to the electric energy metering chip and the microprocessor.
In an embodiment, the knife switch further comprises: and the display module is connected with the microprocessor and used for displaying the electric energy value.
In an embodiment, the knife switch further comprises: and the communication module is connected with the microprocessor and is used for realizing communication between the microprocessor and external equipment.
In an embodiment, the knife switch further comprises: and the storage module is connected with the microprocessor and used for storing the electric energy value.
In an embodiment, the knife switch further comprises: the input end of the signal processing circuit is connected with the current transformer, the output end of the signal processing circuit is connected with the electric energy metering chip, and the signal processing circuit is used for carrying out low-pass filtering processing on current signals collected by the current transformer.
In one embodiment, the signal processing circuit includes a sampling filter, a high pass filter, a low pass filter, a squaring circuit, and an open squaring circuit.
In one embodiment, the power metering chip is an analog-to-digital converter.
In one embodiment, the communication module is connected to the microprocessor through an RS485 communication protocol.
The technical scheme of the utility model has the following advantages:
the embodiment of the utility model provides a knife switch, wherein a current transformer is arranged on a bottom plate of the knife switch to collect current signals of the knife switch, so that the limitation of space and product size requirements of a box body of the knife switch is avoided, and convenience in measuring current is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a knife switch according to an embodiment of the present utility model;
fig. 2 is a block diagram of a knife switch according to an embodiment of the present utility model.
Reference numerals illustrate:
1. a bottom plate; 11. a wire inlet fixed contact; 12. a static outlet contact; 13. a moving contact blade; 14. a fixing groove; 15. a cross beam; 16. a handle; 2. a current transformer; 3. a voltage dividing circuit; 4. a circuit power supply; 5. an electric energy metering chip; 6. a microprocessor; 7. a display module; 8. a communication module; 9. and a storage module.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. 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.
In order to facilitate the collection of the current value of the knife switch, in the embodiment of the utility model, a knife switch is provided, as shown in fig. 1 and 2, and the knife switch comprises a bottom plate 1 and a current transformer 2, wherein,
the bottom plate 1 is provided with an incoming line fixed contact 11, and the incoming line fixed contact 11 is electrically connected with an incoming line of the knife switch;
an outgoing line fixed contact 12 is further arranged on the bottom plate 1, and the outgoing line fixed contact 12 is electrically connected with an outgoing line of the knife switch;
the bottom plate 1 is also provided with a moving contact blade 13, the moving contact blade 13 is suitable for rotating around a hinge point, the moving contact blade has a conducting state contacted with the incoming line fixed contact 11 and a disconnecting state arranged at intervals with the incoming line fixed contact 11, and the hinge point is connected with the outgoing line fixed contact 12;
the bottom plate 1 is provided with a fixed slot 14, the current transformer 2 passes through the fixed contact and is arranged in the fixed slot 14, and the current transformer 2 passes through the outgoing fixed contact 12 and is used for collecting current signals of the knife switch.
In the embodiment of the utility model, an incoming line fixed contact 11 and an outgoing line fixed contact 12 are fixedly arranged on a bottom plate 1, and a fixed hole for connecting a moving contact blade 13 is arranged on the outgoing line fixed contact 12 to form pin connection. The movable contact blades 13 are arranged at intervals, the other end of each movable contact blade 13 is fixedly connected with a cross beam 15, and the cross beams 15 are fixedly connected with handles 16. In fig. 1, 4 movable contact blades 13 are taken as an example, which is not limiting. The staff rotates the crossbeam 15 synchronously through the operation handle 16, so that the on-off of the knife switch is realized.
The current transformer 2 collects current signals of each phase, wherein the current transformer 2 can be a current transformer for instruments or can be a current transformer of other types, and the types of the current transformers 2 are not limited.
It should be noted that fig. 1 is only an example of the positions of the incoming line fixed contact 11 and the outgoing line fixed contact 12, and in practical application, the positions of the incoming line fixed contact 11 and the outgoing line fixed contact 12 may be interchanged.
Specifically, in an embodiment, the knife switch further comprises a voltage dividing circuit 3, and an input end power supply of the voltage dividing circuit 3 is connected with the fixed contact end.
In the embodiment of the utility model, the voltage dividing circuit 3 samples each phase of voltage, the circuit power supply 4 can directly obtain each phase of voltage signal from the voltage dividing circuit 3, two paths of 12V power supplies are output through the power management circuit in an auxiliary power supply mode, different direct current voltage outputs are realized through the low dropout linear voltage regulator (Low DropOut regulator, LDO), so that power supply to each module is realized, and collection of power supply voltage of the knife switch is completed.
Specifically, the power management circuit is a switching power supply circuit, and the switching power supply circuit comprises an electromagnetic interference unit (Electromagnetic Interference, EMI), a rectifying and filtering unit, a high-frequency transformer, a PWM control chip unit, a feedback unit, a rectifying and output filtering unit and a voltage stabilizing and output unit.
Specifically, in an embodiment, the knife switch further comprises: an electrical energy metering chip 5 and a microprocessor 6, wherein,
the electric energy metering chip 5 is connected to the first output ends of the current transformer 2 and the voltage dividing circuit 3 and is used for generating corresponding pulse signals according to the current signals acquired by the current transformer 2 and the voltage signals output by the voltage dividing circuit 3;
the microprocessor 6 is connected with the electric energy metering chip 5 and calculates the electric energy value of the knife switch according to the pulse signal;
the output end of the voltage dividing circuit 3 is used for supplying power to the electric energy metering chip 5 and the microprocessor 6.
In the embodiment of the present utility model, the electric energy metering chip 5 may be a high-precision analog-digital converter, or may be another chip capable of realizing electric energy metering, which is not limited herein. The electric energy metering chip 5 receives the current signal collected by the current transformer 2 and receives the voltage signal output by the voltage dividing circuit 3. The electric energy metering chip 5 converts the current signal and the voltage signal into digital signals for processing, converts the current signal and the voltage signal into pulse signals, and sends the pulse signals to the microprocessor 6. After the microprocessor 6 receives the pulse signal, the electric energy is calculated by a chip built in the microprocessor 6.
Specifically, in one embodiment, the knife switch further includes a display module 7, where the display module 7 is connected to the microprocessor 6 to display the electric energy value.
In the embodiment of the utility model, the knife switch is provided with the protective cover shell for protecting the internal structure of the knife switch. The knife switch is provided with a display module 7, and the display module 7 can be a display screen or other devices capable of realizing a display function, and is not limited herein. The display module 7 acquires the electric energy value of the knife switch in real time and displays the electric energy value, so that a user can conveniently see the current electric energy value in real time through the display module 7, and the electric energy value of the knife switch is conveniently compared with the electric energy value of the electric energy meter, so that whether the condition of power stealing occurs or not is judged.
Specifically, in one embodiment, the knife switch further includes a communication module 8, where the communication module 8 is connected to the microprocessor 6, so as to implement communication between the microprocessor 6 and an external device.
In the embodiment of the present utility model, the communication module 8 may implement communication between the microprocessor 6 and an external device by using a wired communication or a wireless communication method, and the external device may be an electronic device such as a mobile phone, a computer, or a tablet computer, which is not limited herein. The communication module 8 may use RS485 communication protocol to implement communication, or may implement communication via other communication protocols, which is not limited herein. The communication between the microprocessor 6 and the external equipment is realized through the communication module 8, so that the real-time service condition of the knife switch can be conveniently and timely known by a terminal client.
Specifically, in one embodiment, the knife switch further comprises a memory module 9, wherein the memory module 9 is connected to the microprocessor 6 for storing the electrical energy value.
In the embodiment of the present utility model, the storage module 9 may be a memory, or may be other devices capable of implementing storage, where the storage module 9 stores the calculation result of the microprocessor 6 and the calculation data generated in the calculation process, so as to facilitate the user to query the calculation process and the calculation result.
Specifically, in an embodiment, the knife switch further includes a signal processing circuit (not shown in the figure), an input end of the signal processing circuit is connected to the current transformer 2, an output end of the signal processing circuit is connected to the electric energy metering chip 5, and the signal processing circuit is used for performing low-pass filtering processing on a current signal collected by the current transformer 2.
In the embodiment of the utility model, the signal processing circuit receives the current signal collected by the current transformer 2, carries out high-pass filtering and direct-current gain processing on the current signal, and converts the current signal into an analog signal. The current signal is processed by the signal processing circuit, so that the electric energy metering chip 5 can calculate electric energy according to the current signal conveniently.
Specifically, in one embodiment, the signal processing circuit includes a sampling filter, a high pass filter, a low pass filter, a squaring circuit, and an open squaring circuit.
In the embodiment of the utility model, high-frequency noise is filtered out of a current signal and a voltage signal through a sampling filter and a high-pass filter, direct-current gain processing is performed to obtain current sampling data and voltage sampling data, and the current sampling data and the voltage sampling data are calculated to obtain instantaneous active power. And then the average active power is output through a low-pass filter. And then obtaining a current effective value and a voltage effective value through a square circuit, a low-pass filter and an open square circuit.
Through above-mentioned embodiment, through installing current transformer on the bottom plate of knife switch to gather the current signal of knife switch, thereby not receive the restriction of the space and the product size requirement of knife switch box, increase the convenience of measuring the electric current.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.
Claims (10)
1. A knife switch, comprising: the base plate is provided with an incoming line fixed contact, an outgoing line fixed contact and a moving contact blade, the base plate is provided with a fixed slot, the current transformer is arranged in the fixed slot, wherein,
the incoming line fixed contact is electrically connected with an incoming line of the knife switch, and the outgoing line fixed contact is electrically connected with an outgoing line of the knife switch;
the movable contact blade is suitable for rotating around a hinge point and is provided with a conducting state in contact with the incoming line fixed contact and a disconnecting state arranged at intervals with the incoming line fixed contact, and the hinge point is connected with the outgoing line fixed contact;
the current transformer passes through the outgoing line fixed contact and is used for collecting current signals of the knife switch.
2. The knife switch of claim 1, further comprising: and the input end power supply of the voltage dividing circuit is connected with the fixed contact end.
3. The knife switch of claim 2, further comprising: an electric energy metering chip and a microprocessor, wherein,
the electric energy metering chip is connected to the current transformer and the first output end of the voltage dividing circuit and is used for generating corresponding pulse signals according to current signals acquired by the current transformer and voltage signals output by the voltage dividing circuit;
the microprocessor is connected with the electric energy metering chip and calculates the electric energy value of the knife switch according to the pulse signal;
and the output end of the voltage dividing circuit is used for supplying power to the electric energy metering chip and the microprocessor.
4. A knife switch according to claim 3, further comprising: and the display module is connected with the microprocessor and used for displaying the electric energy value.
5. A knife switch according to claim 3, further comprising: and the communication module is connected with the microprocessor and is used for realizing communication between the microprocessor and external equipment.
6. A knife switch according to claim 3, further comprising: and the storage module is connected with the microprocessor and used for storing the electric energy value.
7. A knife switch according to claim 3, further comprising: the input end of the signal processing circuit is connected with the current transformer, the output end of the signal processing circuit is connected with the electric energy metering chip, and the signal processing circuit is used for carrying out low-pass filtering processing on current signals collected by the current transformer.
8. The knife switch of claim 7 wherein the signal processing circuit comprises a sampling filter, a high pass filter, a low pass filter, a squaring circuit, and an open squaring circuit.
9. A knife switch according to claim 3, wherein the power metering chip is an analog-to-digital converter.
10. The knife switch of claim 5, wherein the communication module is coupled to the microprocessor via an RS485 communication protocol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223058585.1U CN218896586U (en) | 2022-11-16 | 2022-11-16 | Knife switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223058585.1U CN218896586U (en) | 2022-11-16 | 2022-11-16 | Knife switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218896586U true CN218896586U (en) | 2023-04-21 |
Family
ID=85996139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223058585.1U Active CN218896586U (en) | 2022-11-16 | 2022-11-16 | Knife switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218896586U (en) |
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2022
- 2022-11-16 CN CN202223058585.1U patent/CN218896586U/en active Active
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| CB03 | Change of inventor or designer information |
Inventor after: Liu Hui Inventor after: Pan Xiangxiang Inventor after: Yu Lei Inventor after: Bao Xiaozhong Inventor after: Chen Yueyue Inventor after: Liu Jinmiao Inventor after: Wang Kang Inventor before: Liu Hui Inventor before: Pan Xiangxiang Inventor before: Yu Lei Inventor before: Bao Xiaozhong Inventor before: Chen Yueyue Inventor before: Liu Jinmiao |