CN218956674U - Traveling wave current sampling circuit for pole switch and pole switch - Google Patents
Traveling wave current sampling circuit for pole switch and pole switch Download PDFInfo
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- CN218956674U CN218956674U CN202223135243.5U CN202223135243U CN218956674U CN 218956674 U CN218956674 U CN 218956674U CN 202223135243 U CN202223135243 U CN 202223135243U CN 218956674 U CN218956674 U CN 218956674U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model relates to a traveling wave current sampling circuit for a pole switch and the pole switch, which comprises: the electronic current transformer is used for collecting current signals of the power transmission line; the input end of the filtering circuit is connected with the output end of the electronic current transformer, and the filtering circuit comprises a low-pass filtering circuit and a band-pass filtering circuit and is used for filtering the current signals to obtain travelling wave current signals in the current signals; and the input end of the acquisition circuit is connected with the output end of the filter circuit and is used for acquiring traveling wave current signals, converting the traveling wave current signals into digital signals from analog signals and transmitting the converted traveling wave current signals. The filtering circuit can filter out currents except traveling wave current signals in current signals collected by the electronic current transformer, so that the traveling wave current signals are extracted, analog signals are converted into digital signals through the collecting circuit, and fault positioning equipment in the power transmission line can perform fault positioning through the extracted traveling wave signals.
Description
Technical Field
The application relates to the technical field of signal acquisition of transmission lines, in particular to a traveling wave current sampling circuit for a pole-mounted switch and the pole-mounted switch.
Background
The distribution network is taken as the last link of the power system and bears the heavy duty of connecting the transmission line with the distribution user. The power distribution network has the characteristics of wide coverage range, complex running environment, severe working conditions, high failure occurrence and the like. To improve the reliability of the power supply of the distribution network and reduce the fault influence range, a large number of pole switches are generally configured for rapidly isolating fault sections.
The traditional pole switch mainly adopts an electromagnetic current transformer to collect current signals, but the electromagnetic current transformer has the problems of large size, small dynamic range, saturation phenomenon, easy ferromagnetic resonance generation and the like, so that the electromagnetic current transformer is gradually eliminated by the market at present. With the continuous advancement of digital substations and smart grids, electronic current transformers are increasingly being used.
In the related art, after the pole switch collects the current signal through the electronic current transformer, only the power frequency part in the current signal can be extracted to judge the fault type and the fault interval of the power transmission line, but the high-frequency signal, such as the traveling wave current signal, can be accurately positioned for the fault of the power transmission line, but cannot be extracted.
Therefore, how to extract the high-frequency signal for accurately positioning the fault of the power transmission line from the current signal collected by the electronic current transformer is a technical problem to be solved.
Disclosure of Invention
The main aim of the application is to provide a traveling wave current sampling circuit for a pole switch and a pole switch, and aims to solve the technical problem that high-frequency signals in current signals acquired by an electronic current transformer cannot be extracted in the related art.
In a first aspect, the present application provides a traveling wave current sampling circuit for a pole-mounted switch, comprising:
the electronic current transformer is used for collecting current signals of the power transmission line;
the input end of the filtering circuit is connected with the output end of the electronic current transformer, and the filtering circuit comprises a low-pass filtering circuit and a band-pass filtering circuit and is used for filtering the current signals so as to obtain travelling wave current signals in the current signals;
and the input end of the acquisition circuit is connected with the output end of the filter circuit and is used for acquiring the traveling wave current signal, converting the traveling wave current signal into a digital signal from an analog signal and transmitting the converted traveling wave current signal.
In some embodiments, the traveling wave current sampling circuit for a pole switch further comprises:
and the input end of the signal following circuit is connected with the output end of the electronic current transformer, and the output end of the signal following circuit is connected with the input end of the filter circuit and is used for inhibiting the rising rate of the input voltage.
In some embodiments, the signal follower circuit comprises: the first operational amplifier, the capacitor C1, the resistor R1 and the resistor R2;
the positive input end of the first operational amplifier is connected with the output end of the electronic current transformer, the positive input end of the first operational amplifier is grounded through a capacitor C1, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through a resistor R1, and the output end of the first operational amplifier is connected with the input end of the filter circuit through a resistor R2.
In some embodiments, the traveling wave current sampling circuit for a pole switch further comprises:
and the input end of the amplifying circuit is connected with the output end of the filtering circuit, and the output end of the amplifying circuit is connected with the input end of the acquisition circuit and is used for amplifying the travelling wave current signal.
In some embodiments, the amplifying circuit includes: an amplifier, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5;
the reference port REF_LOGIC of the amplifier is grounded, the negative input port-IN of the amplifier is connected with the output port VOUT of the amplifier through a resistor R4, the positive input port +IN of the amplifier is connected with the output end of the filter circuit through a resistor R3, the positive input port +IN is grounded through a capacitor C2, the power supply negative electrode-VS of the amplifier is connected with-5V voltage, the power supply negative electrode-VS is connected with the compensation capacitor port CCOMP of the amplifier through a capacitor C5, the power supply positive electrode +VS of the amplifier is connected with +5V voltage, the DISABLE port is grounded through a capacitor C3, the output port VOUT is connected with the input end of the acquisition circuit through a resistor R5, and the output end of the resistor R5 is grounded through a capacitor C4.
In some embodiments, the acquisition circuit comprises a second operational amplifier, a resistor R6, a resistor R7, a resistor R8, a capacitor C6 and a capacitor C7;
the positive input port of the second operational amplifier is connected with the output end of the amplifying circuit through a resistor R6, the input end of the resistor R6 is grounded through a capacitor C6, the output end of the resistor R6 is grounded through a resistor R7, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier outputs the acquired traveling wave current signal through a resistor R8, and the output end of the resistor R8 is grounded through a capacitor C7.
In some embodiments, the low-pass filter circuit is a second-order low-pass filter circuit for filtering a current signal of the current signals having a frequency higher than a traveling wave current frequency;
the band-pass filter circuit is a second-order band-pass filter circuit and is used for filtering a current signal with the frequency outside a traveling wave current frequency interval in the reserved current signal to obtain the traveling wave current signal.
In some embodiments, the electronic current transformer is configured to collect a power frequency current signal, a traveling wave current signal, and a current clutter of the power transmission line.
In some embodiments, the rated transformation ratio of the electronic current transformer is 600A/1V.
In a second aspect, the present application also provides an on-column switch having a travelling wave current sampling circuit for an on-column switch as described in any one of the above.
The application provides a traveling wave current sampling circuit for pole-mounted switch and pole-mounted switch, include: the electronic current transformer is used for collecting current signals of the power transmission line; the input end of the filtering circuit is connected with the output end of the electronic current transformer, and the filtering circuit comprises a low-pass filtering circuit and a band-pass filtering circuit and is used for filtering the current signals to obtain travelling wave current signals in the current signals; and the input end of the acquisition circuit is connected with the output end of the filter circuit and is used for acquiring traveling wave current signals, converting the traveling wave current signals into digital signals from analog signals and transmitting the converted traveling wave current signals. The filtering circuit can filter out currents except traveling wave current signals in current signals collected by the electronic current transformer, so that the traveling wave current signals are extracted, analog signals are converted into digital signals through the collecting circuit, and fault positioning equipment in the power transmission line can perform fault positioning through the extracted traveling wave signals.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a traveling wave current sampling circuit for a pole switch according to an embodiment of the present application;
FIG. 2 is a schematic diagram showing a specific structure of a signal follower circuit;
FIG. 3 is a schematic diagram showing a specific structure of an amplifying circuit;
fig. 4 is a schematic diagram of a specific structure of the acquisition circuit.
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1 to 4, the present application provides a traveling wave current sampling circuit for a pole switch, which includes:
the electronic current transformer is used for collecting current signals of the power transmission line.
And the input end of the filtering circuit is connected with the output end of the electronic current transformer, and the filtering circuit comprises a low-pass filtering circuit and a band-pass filtering circuit and is used for filtering the current signals so as to obtain travelling wave current signals in the current signals.
And the input end of the acquisition circuit is connected with the output end of the filter circuit and is used for acquiring the traveling wave current signal, converting the traveling wave current signal into a digital signal from an analog signal and transmitting the converted traveling wave current signal.
In some embodiments, the electronic current transformer is used for collecting various current signals such as power frequency current signals, traveling wave current signals, current clutter and the like on the power transmission line, and the rated transformation ratio of the electronic current transformer is 600A/1V.
In some embodiments, the low-pass filter circuit in the filter circuit is a second-order low-pass filter circuit for filtering a current signal with a frequency higher than a traveling wave current frequency in the current signal; the band-pass filter circuit in the filter circuit is a second-order band-pass filter circuit and is used for filtering a current signal with the frequency outside a traveling wave current frequency interval in the reserved current signal, obtaining the traveling wave current signal and outputting the obtained traveling wave signal to the next circuit.
It is worth to say that the electronic current transformer sends the collected current signals to the filtering circuit, and the second-order low-pass filtering circuit and the second-order band-pass filtering circuit filter out the current signals with frequencies outside the traveling wave current frequency interval, so that the traveling wave current signals are extracted from various current signals. The sampling circuit can be connected with a digital signal processing chip DSP in the fault accurate positioning device on the transmission line, the acquisition circuit acquires traveling wave current signals obtained through filtering, converts the traveling wave current signals into digital signals from analog signals, then sends the traveling wave current signals converted into the digital signals into the digital signal processing chip DSP, and then the fault accurate positioning device performs fault positioning according to the traveling wave signals. Wherein. The specific method for accurate fault location based on traveling wave current signals is known to those skilled in the art and is not described in detail herein.
Preferably, the traveling wave current sampling circuit for a pole switch further includes: the signal follower circuit is arranged between the electronic current transformer and the filter circuit, the input end of the signal follower circuit is connected with the output end of the electronic current transformer, and the output end of the signal follower circuit is connected with the input end of the filter circuit and used for inhibiting the rising rate of input voltage.
Specifically, as shown in fig. 2, the signal follower circuit includes: the first operational amplifier, the capacitor C1, the resistor R1 and the resistor R2; the positive input end of the first operational amplifier is connected with the output end of the electronic current transformer, the positive input end of the first operational amplifier is grounded through a capacitor C1, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through a resistor R1, and the output end of the first operational amplifier is connected with the input end of the filter circuit through a resistor R2. The first operational amplifier may be an operational amplifier UA.
The signal follower circuit has the characteristics of high input impedance and low output impedance, can improve the impedance matching and carrying capacity of the circuit and reduce the signal attenuation by utilizing the characteristic that the voltage of the capacitor cannot be suddenly changed and suppressing the voltage rising rate of the device through the parallel capacitor. Meanwhile, the electronic current transformer is arranged between the electronic current transformer and the amplifying circuit to play a role in isolation, so that the amplifying circuit is prevented from interfering the electronic current transformer.
Preferably, the traveling wave current sampling circuit for a pole switch further includes: the amplifying circuit is arranged between the filtering circuit and the sampling circuit, the input end of the amplifying circuit is connected with the output end of the filtering circuit, and the output end of the amplifying circuit is connected with the input end of the collecting circuit and is used for amplifying the travelling wave current signal.
Specifically, as shown in fig. 3, the amplifying circuit includes: amplifier, resistor R3, resistor R4, resistor R5, capacitor C2, capacitor C3, capacitor C4, and capacitor C5. The reference port REF_LOGIC of the amplifier is grounded, the negative input port-IN of the amplifier is connected with the output port VOUT of the amplifier through a resistor R4, the positive input port +IN of the amplifier is connected with the output end of the filter circuit through a resistor R3, the positive input port +IN is grounded through a capacitor C2, the power supply negative electrode-VS of the amplifier is connected with-5V voltage, the power supply negative electrode-VS is connected with the compensation capacitor port CCOMP of the amplifier through a capacitor C5, the power supply positive electrode +VS of the amplifier is connected with +5V voltage, the DISABLE port is grounded through a capacitor C3, the output port VOUT is connected with the input end of the acquisition circuit through a resistor R5, and the output end of the resistor R5 is grounded through a capacitor C4.
The amplifier in the amplifying circuit may be an amplifier AD8021, where the amplifier AD8021 has low voltage noise and low current noise characteristics.
In some embodiments, as shown in fig. 4, the acquisition circuit includes: the second operational amplifier, the resistor R6, the resistor R7, the resistor R8, the capacitor C6 and the capacitor C7; the positive input port of the second operational amplifier is connected with the output end of the amplifying circuit through a resistor R6, the input end of the resistor R6 is grounded through a capacitor C6, the output end of the resistor R6 is grounded through a resistor R7, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier outputs the acquired traveling wave current signal through a resistor R8, and the output end of the resistor R8 is grounded through a capacitor C7. Wherein the second operational amplifier is an AD8544 operational amplifier.
In this embodiment, various current signals on the transmission line are collected through the electronic circuit transformer, then the collected current signals are filtered through the low-pass filter circuit and the band-pass filter circuit in the filter circuit, so that traveling wave current signals are extracted from the various current signals, then the extracted traveling wave current signals are amplified through the amplifying circuit, so that the collection circuit can well collect the traveling wave current signals, the traveling wave current signals are converted into digital signals through the traveling wave current signals by analog signals, and the converted signals are sent to the fault accurate positioning equipment, so that the fault accurate positioning equipment can accurately position faults according to the traveling wave current signals. And a signal follower circuit is arranged between the electronic current transformer and the filter circuit, so that the loss of the current of the electronic current transformer is realized, the isolation function can be realized, and the interference of the amplifying circuit to the electronic current transformer is avoided.
The embodiment of the application also provides a pole-mounted switch, which is provided with the pole-mounted switch of the traveling wave current sampling circuit for the pole-mounted switch.
It should be noted that, for convenience and brevity of description, specific working procedures of the above-described apparatus and each module and unit may refer to corresponding procedures in the foregoing embodiments, and are not repeated herein.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A traveling wave current sampling circuit for a pole-mounted switch, comprising:
the electronic current transformer is used for collecting current signals of the power transmission line;
the input end of the filtering circuit is connected with the output end of the electronic current transformer, and the filtering circuit comprises a low-pass filtering circuit and a band-pass filtering circuit and is used for filtering the current signals so as to obtain travelling wave current signals in the current signals;
and the input end of the acquisition circuit is connected with the output end of the filter circuit and is used for acquiring the traveling wave current signal, converting the traveling wave current signal into a digital signal from an analog signal and transmitting the converted traveling wave current signal.
2. The traveling wave current sampling circuit for a pole switch according to claim 1, further comprising:
and the input end of the signal following circuit is connected with the output end of the electronic current transformer, and the output end of the signal following circuit is connected with the input end of the filter circuit and is used for inhibiting the rising rate of the input voltage.
3. The traveling wave current sampling circuit for a pole switch according to claim 2, wherein said signal follower circuit comprises: the first operational amplifier, the capacitor C1, the resistor R1 and the resistor R2;
the positive input end of the first operational amplifier is connected with the output end of the electronic current transformer, the positive input end of the first operational amplifier is grounded through a capacitor C1, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through a resistor R1, and the output end of the first operational amplifier is connected with the input end of the filter circuit through a resistor R2.
4. The traveling wave current sampling circuit for a pole switch according to claim 1, further comprising:
and the input end of the amplifying circuit is connected with the output end of the filtering circuit, and the output end of the amplifying circuit is connected with the input end of the acquisition circuit and is used for amplifying the travelling wave current signal.
5. The traveling wave current sampling circuit for a pole switch according to claim 4, wherein said amplifying circuit comprises: an amplifier, a resistor R3, a resistor R4, a resistor R5, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5;
the reference port REF_LOGIC of the amplifier is grounded, the negative input port-IN of the amplifier is connected with the output port VOUT of the amplifier through a resistor R4, the positive input port +IN of the amplifier is connected with the output end of the filter circuit through a resistor R3, the positive input port +IN is grounded through a capacitor C2, the power supply negative electrode-VS of the amplifier is connected with-5V voltage, the power supply negative electrode-VS is connected with the compensation capacitor port CCOMP of the amplifier through a capacitor C5, the power supply positive electrode +VS of the amplifier is connected with +5V voltage, the DISABLE port is grounded through a capacitor C3, the output port VOUT is connected with the input end of the acquisition circuit through a resistor R5, and the output end of the resistor R5 is grounded through a capacitor C4.
6. The traveling wave current sampling circuit for a pole switch according to claim 5, wherein the acquisition circuit comprises a second operational amplifier, a resistor R6, a resistor R7, a resistor R8, a capacitor C6 and a capacitor C7;
the positive input port of the second operational amplifier is connected with the output end of the amplifying circuit through a resistor R6, the input end of the resistor R6 is grounded through a capacitor C6, the output end of the resistor R6 is grounded through a resistor R7, the negative input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier outputs the acquired traveling wave current signal through a resistor R8, and the output end of the resistor R8 is grounded through a capacitor C7.
7. The traveling wave current sampling circuit for a pole switch according to claim 1, wherein:
the low-pass filter circuit is a second-order low-pass filter circuit and is used for filtering a current signal with the frequency higher than the traveling wave current frequency in the current signal;
the band-pass filter circuit is a second-order band-pass filter circuit and is used for filtering a current signal with the frequency outside a traveling wave current frequency interval in the reserved current signal to obtain the traveling wave current signal.
8. The traveling wave current sampling circuit for a pole switch according to claim 1, wherein the electronic current transformer is configured to collect a power frequency current signal, a traveling wave current signal and a current clutter of the power transmission line.
9. The traveling wave current sampling circuit for a pole switch according to claim 1, wherein the rated transformation ratio of the electronic current transformer is 600A/1V.
10. A pole-mounted switch, characterized in that it comprises a travelling wave current sampling circuit for pole-mounted switches according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223135243.5U CN218956674U (en) | 2022-11-22 | 2022-11-22 | Traveling wave current sampling circuit for pole switch and pole switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223135243.5U CN218956674U (en) | 2022-11-22 | 2022-11-22 | Traveling wave current sampling circuit for pole switch and pole switch |
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| Publication Number | Publication Date |
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| CN218956674U true CN218956674U (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223135243.5U Active CN218956674U (en) | 2022-11-22 | 2022-11-22 | Traveling wave current sampling circuit for pole switch and pole switch |
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| CN (1) | CN218956674U (en) |
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- 2022-11-22 CN CN202223135243.5U patent/CN218956674U/en active Active
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Address after: 430223 No. 8, floor 24, unit 07, podium building, phase II R & D building, laser engineering design headquarters, No. 3, Guanggu Avenue, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee after: Wuhan Three Phase Electrical Co.,Ltd. Address before: 430223 No. 8, floor 24, unit 07, podium building, phase II R & D building, laser engineering design headquarters, No. 3, Guanggu Avenue, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee before: Wuhan pinxun Technology Co.,Ltd. |