CN218630153U - Device for on-line monitoring of secondary circuit impedance of mutual inductor - Google Patents
Device for on-line monitoring of secondary circuit impedance of mutual inductor Download PDFInfo
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- CN218630153U CN218630153U CN202222663991.4U CN202222663991U CN218630153U CN 218630153 U CN218630153 U CN 218630153U CN 202222663991 U CN202222663991 U CN 202222663991U CN 218630153 U CN218630153 U CN 218630153U
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Abstract
The utility model discloses a device for mutual-inductor secondary circuit impedance on-line monitoring belongs to alternating current test technical field. The utility model discloses the device, include: fixing the cannula for CTEnergy coil CT 1 Secondary current measuring coil CT 2 A capacitor, a PCB circuit board, a shell and a cover plate; the inside CT fixed sleeve and the energy-taking coil CT that are used for placing of the shell 1 Secondary current measuring coil CT 2 The capacitor is installed on the PCB, a secondary circuit line of the current transformer penetrates through the CT fixed sleeve, and the energy-taking coil CT 1 And a secondary current measuring coil CT 2 And the cover plates are respectively penetrated on the secondary circuit lines and are used for covering the upper part of the PCB and sealing the shell. The utility model discloses can realize the real-time supervision of current transformer secondary circuit impedance.
Description
Technical Field
The utility model relates to an alternating current tests technical field to more specifically, relate to a device for mutual-inductor secondary circuit impedance on-line monitoring.
Background
When the low-voltage current transformer operates normally, the secondary loop load is composed of a lead, a terminal contact resistor, an instrument and a controller which are connected in series on the lead in a penetrating way, and the like. The secondary loop load of the low-voltage current transformer is in the milliohm order of magnitude, and the numerical value directly influences the error of the low-voltage current transformer. When the secondary connection terminal of the current transformer is connected in a false or rusted manner, the terminal contact resistance rises to hundreds of milliohms or even several ohms. The increase of the load of the secondary circuit directly causes the deterioration of the metering performance of the low-voltage current transformer, and may cause the heating of the secondary wiring terminal, which is not beneficial to the normal and stable operation of the equipment. How to determine whether the current transformer terminal is connected in a virtual mode or not and is rusted is a problem to be solved urgently.
Disclosure of Invention
To the above problem, the utility model provides a device for mutual-inductor secondary circuit impedance on-line monitoring, include: CT fixed casing tube, energy-taking coil CT 1 Secondary current measuring coil CT 2 A capacitor, a PCB circuit board, a shell and a cover plate;
the inside CT fixed sleeve and the energy-taking coil CT that are used for placing of shell 1 Secondary current measuring coil CT 2 The capacitor is installed on the PCB, a secondary circuit line of the mutual inductor penetrates through the CT fixed sleeve, and the energy-taking coil CT 1 And a secondary current measuring coil CT 2 The cover plates are respectively penetrated on the secondary circuit lines and are used for covering the PCB and sealing the shell;
the energy-taking coil CT 1 Energy is taken through a secondary circuit line, energy is buffered through a capacitor and then is supplied to the PCB, and the secondary current measuring coil CT 2 For measuring twoAnd the PCB is used for measuring a voltage signal of the secondary return line, converting the current signal and the voltage signal of the secondary return line into digital signals and then outputting the digital signals, and the digital signals are used for determining the impedance of a secondary loop of the transformer.
Optionally, the PCB is integrated with a main control unit, an a/D module, a terminal voltage measurement module and a bluetooth module;
the terminal voltage measuring module is used for measuring a voltage signal of a secondary return line;
the A/D module is used for converting the voltage signal and the current signal into digital signals and outputting the digital signals through the Bluetooth module;
the main control unit is used for controlling the A/D module, the terminal voltage measuring module and the Bluetooth module to act.
Optionally, a storage unit is further integrated on the PCB, and the storage unit is used for storing digital signals.
Optionally, the super capacitor is located in the energy-taking coil CT 1 And a secondary current measuring coil CT 2 In the meantime.
Optionally, the casing has a hole, and the hole of the casing and the hole of the CT fixing cannula are on the same horizontal line.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a device for mutual-inductor secondary circuit impedance on-line monitoring, include: CT fixed sleeve and energy-taking coil CT 1 Secondary current measuring coil CT 2 A capacitor, a PCB circuit board, a shell and a cover plate; the inside CT fixed sleeve and the energy-taking coil CT that are used for placing of shell 1 Secondary current measuring coil CT 2 The capacitor is installed on the PCB, a secondary circuit line of the mutual inductor penetrates through the CT fixed sleeve, and the energy-taking coil CT 1 And a secondary current measuring coil CT 2 The cover plates are respectively penetrated on the secondary circuit lines and are used for covering the PCB and sealing the shell; the energy-taking coil CT 1 Energy is taken through a secondary circuit line, energy is buffered through a capacitor and then is supplied to the PCB, and the secondary current measuring coil CT 2 The circuit board is used for measuring a current signal of the secondary circuit line and transmitting the current value to the PCB, the PCB is used for measuring a voltage signal of the secondary circuit line and converting the current signal and the voltage signal of the secondary circuit line into digital signals to be output, and the digital signals are used for determining the impedance of the secondary circuit of the transformer. The utility model can realize the real-time monitoring of the impedance of the secondary circuit of the mutual inductor, and supply power to the PCB circuit board by the self-energy-taking of the energy-taking coil without using an external power supply; whether the transformer terminal is connected in a virtual mode or not and is rusted or not can be determined by monitoring the impedance of the secondary loop, and the impedance can be used as an important criterion for judging whether the metering performance of the transformer is degraded or not.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
fig. 2 is a schematic diagram of the PCB of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, which, however, may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of thoroughly and completely disclosing the present invention and fully conveying the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments presented in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the utility model provides a be used for mutual inductanceThe device for online monitoring the impedance of the secondary circuit of the device comprises: CT fixed sleeve and energy-taking coil CT 1 Secondary current measuring coil CT 2 A capacitor, a PCB circuit board, a shell and a cover plate;
the inside CT fixed sleeve and the energy-taking coil CT that are used for placing of shell 1 Secondary current measuring coil CT 2 The capacitor is installed on the PCB, a secondary circuit line of the current transformer penetrates through the CT fixed sleeve, and the energy-taking coil CT 1 And a secondary current measuring coil CT 2 The cover plates are respectively penetrated on the secondary circuit lines and are used for covering the PCB and sealing the shell;
the energy-taking coil CT 1 Energy is taken through a secondary circuit line, energy is buffered through a capacitor and then is supplied to the PCB, and the secondary current measuring coil CT 2 The circuit board is used for measuring a current signal of the secondary return line and transmitting the current value to the PCB, the PCB is used for measuring a voltage signal of the secondary return line and converting the current signal and the voltage signal of the secondary return line into a digital signal to be output, and the digital signal is used for determining the impedance of the secondary return circuit of the current transformer.
As shown in fig. 2, a main control unit, an a/D module, a terminal voltage measuring module and a bluetooth module are integrated on the PCB;
the terminal voltage measuring module is used for measuring a voltage signal of a secondary return line;
the A/D module is used for converting the voltage signal and the current signal into digital signals and outputting the digital signals through the Bluetooth module;
the main control unit is used for controlling the actions of the A/D module, the terminal voltage measuring module and the Bluetooth module.
The PCB is further integrated with a storage unit, and the storage unit is used for storing digital signals.
Wherein, the super capacitor is positioned in the energy-taking coil CT 1 And a secondary current measuring coil CT 2 In the meantime.
The casing is provided with a hole, and the hole of the casing and the hole of the CT fixed cannula are on the same horizontal line.
Wherein, the shell is fixed with the end part of the current transformer through screws.
The utility model realizes the acquisition of secondary current and terminal voltage aiming at the current transformer; the Bluetooth wireless communication with the terminal is realized; energy-taking coil CT 1 The energy is obtained through the secondary circuit line, non-contact energy obtaining can be achieved, power is supplied to the acquisition, calculation and communication unit, and metering of the low-voltage current transformer is not affected.
Meanwhile, the current waveform characteristic analysis and secondary actual load calculation can be completed through the terminal according to the digital signals.
As shown in FIG. 1, the super capacitor and the micro CT (energy-taking coil CT) on the PCB circuit board 1 And a secondary current measuring coil CT 2 ) Sharing the inner space of the shell, and the super capacitor is positioned in the energy-taking coil CT 1 And a secondary current measuring coil CT 2 In between.
The current transformer secondary circuit impedance on-line monitoring device is arranged at the end part of the low-voltage current transformer. The utility model discloses the shell of device is fixed in the mutual-inductor through the long screw in the middle of on, does not change original low-voltage current transformer structure, the pattern is simple, the simple installation.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model can realize the real-time monitoring of the impedance of the secondary circuit of the current transformer, and supply power to the PCB circuit board by the self-energy-taking of the energy-taking coil without using an external power supply; whether the terminal of the current transformer is in virtual connection and rusted or not can be determined by monitoring the impedance of the secondary loop, and the impedance can be used as an important criterion for judging whether the metering performance of the current transformer is degraded or not.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The embodiment of the present invention provides a scheme that can be implemented by various computer languages, for example, object-oriented programming language Java and transliteration type scripting language JavaScript, etc.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. An apparatus for online monitoring of transformer secondary loop impedance, the apparatus comprising: CT fixed sleeve and energy-taking coil CT 1 Secondary current measuring coil CT 2 A capacitor, a PCB circuit board, a shell and a cover plate;
the inside CT fixed sleeve and the energy-taking coil CT that are used for placing of shell 1 Secondary current measuring coil CT 2 The capacitor is installed on the PCB, a secondary circuit line of the mutual inductor penetrates through the CT fixed sleeve, and the energy-taking coil CT 1 And a secondary current measuring coil CT 2 The cover plates are respectively penetrated on the secondary circuit lines and are used for covering the PCB and sealing the shell;
the energy-taking coil CT 1 Energy is taken through a secondary circuit line, energy is buffered through a capacitor and then is supplied to the PCB, and the secondary current measuring coil CT 2 The circuit board is used for measuring a current signal of the secondary circuit line and transmitting the current value to the PCB, the PCB is used for measuring a voltage signal of the secondary circuit line and converting the current signal and the voltage signal of the secondary circuit line into digital signals to be output, and the digital signals are used for determining the impedance of the secondary circuit of the transformer.
2. The device of claim 1, wherein the PCB circuit board is integrated with a main control unit, an A/D module, a terminal voltage measuring module and a Bluetooth module;
the terminal voltage measuring module is used for measuring a voltage signal of a secondary return line;
the A/D module is used for converting the voltage signal and the current signal into digital signals and outputting the digital signals through the Bluetooth module;
the main control unit is used for controlling the actions of the A/D module, the terminal voltage measuring module and the Bluetooth module.
3. The apparatus of claim 2, wherein the PCB circuit board further has a memory unit integrated thereon, the memory unit being configured to store digital signals.
4. The apparatus of claim 1, wherein the super capacitor is located in the energy pick-up coil CT 1 And a secondary current measuring coil CT 2 In the meantime.
5. The device of claim 1, wherein the housing has a bore that is level with the bore of the CT fixation cannula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222663991.4U CN218630153U (en) | 2022-10-10 | 2022-10-10 | Device for on-line monitoring of secondary circuit impedance of mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222663991.4U CN218630153U (en) | 2022-10-10 | 2022-10-10 | Device for on-line monitoring of secondary circuit impedance of mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218630153U true CN218630153U (en) | 2023-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222663991.4U Active CN218630153U (en) | 2022-10-10 | 2022-10-10 | Device for on-line monitoring of secondary circuit impedance of mutual inductor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218630153U (en) |
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2022
- 2022-10-10 CN CN202222663991.4U patent/CN218630153U/en active Active
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