CN115831653A - Knife switch and electric energy calculation method thereof - Google Patents
Knife switch and electric energy calculation method thereof Download PDFInfo
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- CN115831653A CN115831653A CN202211433900.6A CN202211433900A CN115831653A CN 115831653 A CN115831653 A CN 115831653A CN 202211433900 A CN202211433900 A CN 202211433900A CN 115831653 A CN115831653 A CN 115831653A
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Abstract
The invention provides a knife switch and an electric energy calculation method thereof, wherein the knife switch comprises: the bottom plate is provided with an incoming line static contact, an outgoing line static contact and a moving contact blade, the bottom plate is provided with a fixing groove, the current transformer penetrates through the static contact and is installed in the fixing groove, the incoming line static contact is electrically connected with an incoming line of the knife switch, and the outgoing line static contact is electrically connected with an outgoing line of the knife switch; the moving contact blade is suitable for rotating around a hinge point, and has a conducting state in contact with the incoming line static contact and a disconnecting state arranged at intervals with the incoming line static contact, and the hinge point is connected with the outgoing line static contact; and the current transformer is electrically connected with the outlet static contact and is used for acquiring a current signal of the knife switch. According to the knife switch and the electric energy calculation method thereof, 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 of a knife switch box body and the requirement of the product size is avoided, and the convenience of measuring the current is improved.
Description
Technical Field
The invention relates to the field of knife switches, in particular to a knife switch and an electric energy calculation method thereof.
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 a branch box and a grid-connected box, the knife switch is widely applied because the knife switch has an obvious disconnection point and is convenient to operate.
In the prior art, a mutual inductor is additionally arranged on a knife switch to measure the current value passing through the knife switch, and a lead is externally connected to a wire outlet end of the knife switch to be connected with the mutual inductor. However, the mode of adding the mutual inductor has higher requirements on the space of the knife switch box body and the size of the product, and does not utilize the miniaturization design of the product.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problems that the requirement on the space and the product size of a knife switch box body is higher and the miniaturization design of a product is not utilized in a mode of additionally adding a mutual inductor in the prior art, thereby providing the knife switch and the electric energy calculation method thereof.
According to a first aspect, the present invention provides a knife switch comprising: the bottom plate is provided with an incoming line static contact, an outgoing line static contact and a moving contact blade, the bottom plate is provided with a fixing groove, the current transformer passes through the static contact and is arranged in the fixing groove, wherein,
the incoming line static contact is electrically connected with an incoming line of the knife switch, and the outgoing line static contact is electrically connected with an outgoing line of the knife switch;
the moving contact blade is suitable for rotating around a hinge point, and has a conducting state in contact with the incoming line static contact and a disconnecting state arranged at intervals with the incoming line static contact, and the hinge point is connected with the outgoing line static contact;
the current transformer penetrates through the outgoing line static contact and is used for collecting current signals of the knife switch.
In one embodiment, the knife switch further comprises: and the input end power supply of the voltage division circuit is connected with the stationary contact end.
In one 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 used for generating corresponding pulse signals according to current signals collected 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 tail end of the voltage division circuit is used for supplying power to the electric energy metering chip and the microprocessor.
In one embodiment, the knife switch further comprises: and the display module is connected with the microprocessor and displays the electric energy value.
In one embodiment, the knife switch further comprises: and the communication module is connected with the microprocessor to realize the communication between the microprocessor and external equipment.
In one embodiment, the knife switch further comprises: a storage module connected to the microprocessor for storing the electrical energy value.
In one 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 performing 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.
According to a second aspect, the present invention provides a method for calculating the electric energy of a knife switch, which is applied to the knife switch according to any one of the first aspect, and the method comprises:
acquiring a current signal acquired by a current transformer and a power supply voltage signal of the knife switch;
generating a corresponding pulse signal based on the current signal and the supply voltage signal;
and calculating the electric energy value of the knife switch based on the pulse signal.
In one embodiment, the generating a corresponding pulse signal based on the current signal and the supply voltage signal includes:
calculating active power, active energy, a current effective value and a voltage effective value corresponding to the current signal and the power supply voltage signal;
and generating a corresponding pulse signal based on the active power, the active energy, the current effective value and the voltage effective value.
The technical scheme of the invention has the following advantages:
the embodiment of the invention provides a knife switch, which is characterized in that a current transformer is arranged on a bottom plate of the knife switch to collect a current signal of the knife switch, so that the limitation of the space of a knife switch box body and the requirement of the product size is avoided, and the convenience of measuring current is improved.
The embodiment of the invention also provides an electric energy calculation method of the knife switch, which obtains the electric energy value of the knife switch by obtaining the current signal and the voltage signal of the knife switch and calculating the current signal and the voltage signal so as to record or count the electric energy value of the knife switch.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a knife switch according to an embodiment of the present invention;
fig. 2 is a block diagram of a knife switch according to an embodiment of the present invention;
fig. 3 is a flowchart of an electric energy calculation method for a knife switch according to an embodiment of the present invention.
Description of reference numerals:
1. a base plate; 11. leading in a static contact; 12. an outgoing line static contact; 13. a moving contact blade; 14. fixing grooves; 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 technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to facilitate the collection of the current value of the knife switch, an embodiment of the present invention provides a knife switch, as shown in fig. 1 and 2, the knife switch includes a bottom plate 1 and a current transformer 2, wherein,
an inlet static contact 11 is arranged on the bottom plate 1, and the inlet static contact 11 is electrically connected with an inlet wire of the knife switch;
the bottom plate 1 is also provided with an outlet static contact 12, and the outlet static contact 12 is electrically connected with an outlet of the knife switch;
the bottom plate 1 is also provided with a movable contact blade 13, the movable contact blade 13 is suitable for rotating around a hinge point, and has a conducting state in contact with the incoming line static contact 11 and a disconnecting state arranged at intervals with the incoming line static contact 11, and the hinge point is connected with the outgoing line static contact 12;
the bottom plate 1 is provided with a fixing groove 14, the current transformer 2 penetrates through the fixed contact and is installed in the fixing groove 14, and the current transformer 2 penetrates through the outgoing line fixed contact 12 and is used for collecting current signals of the knife switch.
In the embodiment of the invention, the incoming line static contact 11 and the outgoing line static contact 12 are fixedly arranged on the bottom plate 1, and the outgoing line static contact 12 is provided with a fixing hole for connecting the moving contact blade 13 to form pin connection. The moving contact blade 13 has a plurality ofly, and the interval sets up, and moving contact blade 13's other end fixedly connected with crossbeam 15, fixedly connected with handle 16 on the crossbeam 15. In fig. 1, 4 movable contact blades 13 are taken as an example, which is only taken as an example and is not limiting. The worker operates the handle 16 to rotate the beam 15 synchronously, thereby turning on and off the knife switch.
The current transformer 2 collects phase current signals, wherein the current transformer 2 may be a current transformer for an instrument, or may be a current transformer of other types, and the type of the current transformer 2 is not limited herein.
It should be noted that fig. 1 is only used as an example of the positions of the incoming line static contact 11 and the outgoing line static contact 12, and in practical application, the positions of the incoming line static contact 11 and the outgoing line static contact 12 may be interchanged.
Specifically, in one embodiment, the knife switch further includes a voltage dividing circuit 3, and an input terminal power supply of the voltage dividing circuit 3 is connected with the stationary contact terminal.
In the embodiment of the invention, the voltage division circuit 3 samples each phase voltage, the circuit power supply 4 can directly obtain each phase voltage signal from the voltage division circuit 3, and outputs two 12V power supplies through the power management circuit by adopting an auxiliary power supply mode, and different direct current voltage outputs are realized through a Low DropOut regulator (LDO), so that power supply for each module is realized, and the acquisition of the 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 includes an Electromagnetic Interference (EMI) unit, a rectifying and filtering unit, a high-frequency transformer, a PWM control chip unit, a feedback unit, a rectifying and outputting filtering unit, and a voltage stabilizing output unit.
Specifically, in one embodiment, the knife switch further comprises: an electric 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 collected 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 division circuit 3 is used for supplying power to the electric energy metering chip 5 and the microprocessor 6
In the embodiment of the present invention, the electric energy metering chip 5 may be a high-precision analog-to-digital converter, or may be another chip capable of implementing electric energy metering, and 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 through a chip built in the microprocessor 6.
In particular, in one embodiment, the knife switch further comprises a display module 7, the display module 7 being connected to the microprocessor 6 for displaying the electric energy value.
In the embodiment of the invention, the knife switch is provided with the protective cover shell which is used for protecting the internal structure of the knife switch. The knife switch is provided with a display module 7, and the display module 7 may be a display screen or other devices capable of realizing a display function, which 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 see the current electric energy value in real time through the display module 7, and therefore the electric energy value of the knife switch and the electric energy value of the electric energy meter can be compared conveniently to judge whether electricity stealing occurs or not.
Specifically, in one embodiment, the knife switch further includes a communication module 8, and the communication module 8 is connected to the microprocessor 6 to enable the microprocessor 6 to communicate with an external device.
In the embodiment of the present invention, the communication module 8 may implement communication between the microprocessor 6 and an external device in a wired communication or wireless communication manner, where the external device may be an electronic device such as a mobile phone, a computer, and a tablet computer, and is not limited herein. The communication module 8 may implement communication by using an RS485 communication protocol, and may implement communication by using 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 a terminal customer can conveniently know the real-time use condition of the knife switch in time.
In particular, in an embodiment, the knife switch further comprises a memory module 9, the memory module 9 being connected to the microprocessor 6 for storing the electrical energy value.
In the embodiment of the present invention, the storage module 9 may be a memory or other devices capable of realizing storage, and the storage module 9 stores the calculation result of the microprocessor 6 and the calculation data generated in the calculation process, so that a user can 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 configured to perform low-pass filtering processing on a current signal collected by the current transformer 2.
In the embodiment of the present invention, the signal processing circuit receives the current signal collected by the current transformer 2, and performs high-pass filtering and dc gain processing on the current signal to convert the current signal into an analog signal. The current signal is processed through the signal processing circuit, and the electric energy metering chip 5 can calculate the electric energy conveniently according to the current signal.
In particular, 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 invention, high-frequency noise is firstly filtered from the current signal and the voltage signal by the sampling filter and the high-pass filter, and the direct-current gain processing is carried out 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 squaring circuit, a low-pass filter and an open square circuit.
Through the embodiment, 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 of a knife switch box body and the requirement of the product size is avoided, and the convenience of measuring the current is improved.
The embodiment of the present invention further provides a method for calculating an electric energy of a knife switch, which is applied to the knife switch, as shown in fig. 3, and the method includes the following steps S101 to S103.
Step S101: and acquiring a current signal acquired by the current transformer and a power supply voltage signal of the knife switch.
In the embodiment of the invention, the current signal acquired by the current transformer arranged in the knife switch fixing groove is acquired, and the current transformer is arranged in the knife switch, so that the assembly is convenient and the measurement precision is high. And acquiring a power supply voltage signal of the knife switch so as to calculate the electric energy according to the current signal and the power supply voltage signal.
Step S102: based on the current signal and the supply voltage signal, a corresponding pulse signal is generated.
In the embodiment of the invention, the current signal and the power supply voltage signal are subjected to low-pass filtering and direct-current gain processing to obtain current sampling data and voltage sampling data. And (3) passing the current sampling data and the voltage sampling data through a squaring circuit, a low-pass filter and a squaring circuit to obtain a current effective value and a voltage effective value, performing integral calculation on the average active power to obtain an active energy, and generating a pulse signal. The implementation means for generating the pulse signal according to the current sampling data and the voltage sampling data is the prior art, and is not described herein again.
Step S103: and calculating the electric energy value of the knife switch based on the pulse signal.
In the embodiment of the invention, the pulse signals are processed through a program algorithm built in the microprocessor, the number of input pulses is accumulated, and accurate metering of electric energy is realized according to the pulse constant. The implementation means for calculating the electric energy value according to the number of input pulses is the prior art, and is not described herein again.
Specifically, in an embodiment, the generating a corresponding pulse signal based on the current signal and the supply voltage signal in the step S102 specifically includes the following steps:
step S1021: and calculating the active power, the active function quantity, the current effective value and the voltage effective value corresponding to the current signal and the power supply voltage signal.
Step S1022: and generating a corresponding pulse signal based on the active power, the active energy, the current effective value and the voltage effective value.
In the embodiment of the invention, the current sampling data and the voltage sampling data corresponding to the current signal and the power supply voltage signal are processed by a squaring circuit, a low-pass filter and a square-open circuit to obtain a current effective value and a voltage effective value, and the average active power is subjected to integral calculation to obtain the active energy. Based on the active power, the active energy, the current effective value and the voltage effective value, a plurality of electrical digital values are output through a Serial Peripheral Interface (SPI) to generate corresponding pulse signals. After the microprocessor obtains the pulse signals, the number of the input pulses is accumulated and calculated through an algorithm program arranged in the system, accurate metering of electric energy is realized according to the size of a pulse constant, and data are transmitted through various interfaces and then are transferred to an internal memory.
Through the embodiment, the electric energy value of the knife switch is obtained by acquiring the current signal and the voltage signal of the knife switch and calculating the current signal and the voltage signal, so that the electric energy value of the knife switch can be recorded or counted conveniently.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A knife switch, comprising: the bottom plate is provided with an incoming line static contact, an outgoing line static contact and a moving contact blade, the bottom plate is provided with a fixing groove, the current transformer is arranged in the fixing groove, wherein,
the incoming line static contact is electrically connected with the incoming line of the knife switch, and the outgoing line static contact is electrically connected with the outgoing line of the knife switch;
the moving contact blade is suitable for rotating around a hinge point, and has a conducting state in contact with the incoming line static contact and a disconnecting state arranged at intervals with the incoming line static contact, and the hinge point is connected with the outgoing line static contact;
the current transformer penetrates through the outgoing line static 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 division circuit is connected with the stationary 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 used for generating corresponding pulse signals according to current signals collected 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 tail end of the voltage division circuit is used for supplying power to the electric energy metering chip and the microprocessor.
4. The knife switch of claim 3, further comprising: and the display module is connected with the microprocessor and displays the electric energy value.
5. The knife switch of claim 3, further comprising: and the communication module is connected with the microprocessor to realize the communication between the microprocessor and external equipment.
6. The knife switch of claim 3, further comprising: a storage module connected to the microprocessor for storing the electrical energy value.
7. The knife switch of 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 performing 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 a squaring circuit.
9. A blade switch power calculation method applied to the blade switch according to any one of claims 1 to 8, the method comprising:
acquiring a current signal acquired by a current transformer and a power supply voltage signal of the knife switch;
generating a corresponding pulse signal based on the current signal and the supply voltage signal;
and calculating the electric energy value of the knife switch based on the pulse signal.
10. The method of claim 9, wherein generating the corresponding pulse signal based on the current signal and the supply voltage signal comprises:
calculating active power, active energy, a current effective value and a voltage effective value corresponding to the current signal and the power supply voltage signal;
and generating a corresponding pulse signal based on the active power, the active energy, the current effective value and the voltage effective value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433900.6A CN115831653A (en) | 2022-11-16 | 2022-11-16 | Knife switch and electric energy calculation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211433900.6A CN115831653A (en) | 2022-11-16 | 2022-11-16 | Knife switch and electric energy calculation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115831653A true CN115831653A (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211433900.6A Pending CN115831653A (en) | 2022-11-16 | 2022-11-16 | Knife switch and electric energy calculation method thereof |
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| Country | Link |
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| CN (1) | CN115831653A (en) |
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- 2022-11-16 CN CN202211433900.6A patent/CN115831653A/en active Pending
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