CN110672912A - Leakage current mobile phone remote device - Google Patents
Leakage current mobile phone remote device Download PDFInfo
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- CN110672912A CN110672912A CN201810716886.8A CN201810716886A CN110672912A CN 110672912 A CN110672912 A CN 110672912A CN 201810716886 A CN201810716886 A CN 201810716886A CN 110672912 A CN110672912 A CN 110672912A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a leakage current mobile phone remote device which is arranged at a grounding current end of an iron core of a transformer and comprises a voltage division circuit, a proportional operation circuit, a low-pass filter circuit, an analog-to-digital conversion module, a wireless communication module and a micro-processing chip, wherein the input end of the voltage division circuit is electrically connected with the grounding current end of the iron core of the transformer; the voltage division circuit provides input voltage drop for the proportional operation circuit; the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit; the output end of the low-pass filter circuit is electrically connected with the input end of the analog-to-digital conversion module; the output end of the analog-to-digital conversion module is electrically connected with the input end of the micro-processing chip; the first output end of the micro-processing chip is electrically connected with the input end of the wireless communication module. The invention effectively realizes the detection and protection of the main transformer; and because the operational amplifier, the analog-to-digital conversion module and the microprocessing chip all use a unified power supply, a related voltage transformation circuit is omitted, and the device has a simpler structure and a smaller volume.
Description
Technical Field
The invention relates to the field of transformer detection, in particular to a mobile phone remote device for leakage current.
Background
The main transformer is one of the most important electric devices, and is directly related to the normal conversion and transmission of electric energy, and the main transformer mainly comprises an iron core, a winding and the like. And when the iron core fails, one of the common faults of the main transformer is caused. The iron core is grounded in multiple points, so that a closed loop is formed between the iron core and a ground screen to generate circulation, local or overall overheating of the iron core is caused, and the aging of an insulating material and the decomposition of insulating oil are accelerated due to the local or overall overheating of the iron core, so that the overall insulating property and the mechanical property of the iron core are reduced, and the safe and stable operation of the transformer is influenced. More serious possibility is that the grounding flat iron of the main transformer fuses or burns out the iron core, so that the potential of the iron core is suspended, and the transformer is damaged due to the discharge phenomenon. The most direct phenomenon of iron core multipoint grounding is that iron core grounding current becomes large.
Disclosure of Invention
The invention overcomes the defects of the detection of the existing main transformer and provides a novel leakage current mobile phone remote device. The invention effectively realizes the detection and protection of the main transformer by utilizing the voltage division circuit and the proportional operation circuit to sample and analyze the grounding current of the main transformer.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a leakage current mobile phone remote device is arranged at the grounding current end of an iron core of a transformer and comprises a voltage division circuit, a proportional operation circuit, a low-pass filter circuit, an analog-to-digital conversion module, a wireless communication module and a micro-processing chip,
the input end of the voltage division circuit is electrically connected with the grounding current end of the iron core of the transformer;
the voltage division circuit provides input voltage drop for the proportional operation circuit;
the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit;
the output end of the low-pass filter circuit is electrically connected with the input end of the analog-to-digital conversion module;
the output end of the analog-to-digital conversion module is electrically connected with the input end of the micro-processing chip;
and the first output end of the micro-processing chip is electrically connected with the input end of the wireless communication module.
The working process of the invention is as follows:
the grounding current of the iron core of the transformer is subjected to voltage division through the voltage division circuit, then further voltage division is performed through the proportional operation circuit, and filtering is performed through the low-pass filter circuit. And finally, transmitting the obtained filtering signal to a micro-processing chip. The micro-processing chip performs linear conversion according to the filtering signal to obtain a numerical value of the grounding current of the iron core of the transformer, and judges the iron core of the transformer. Meanwhile, the numerical value of the grounding current of the iron core of the transformer is transmitted to a handheld terminal of a remote worker through the wireless communication module.
In a preferred embodiment, the low-pass filter circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, a first capacitor, and a first operational amplifier,
one end of the second resistor is used as the input end of the low-pass filter circuit, and the other end of the second resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the inverting input end of the first operational amplifier is grounded;
the other end of the second resistor is electrically connected with one end of a third resistor;
the other end of the second resistor is electrically connected with one end of the first resistor;
the other end of the first resistor is electrically connected with the output end of the first operational amplifier;
the other end of the third resistor is electrically connected with the anode of the first diode;
the other end of the third resistor is electrically connected with the cathode of the second diode;
the cathode of the first diode is electrically connected with the anode of the second diode;
the other end of the third resistor is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is grounded;
the other end of the fourth resistor is electrically connected with the anode of the second diode;
the other end of the third resistor is electrically connected with one end of the first capacitor;
the other end of the first capacitor is electrically connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is used as the output end of the low-pass filter circuit.
In the preferred scheme, the low-pass filter circuit has the advantages of effectively eliminating the adverse effect of high-frequency clutter on electric energy storage and transmission, and having high precision and low cost.
In a preferred embodiment, the resistance values of the first resistor, the second resistor and the third resistor are all equal.
In a preferred embodiment, the parameters of the first diode and the second diode are the same.
In a preferred embodiment, the voltage divider circuit includes a fifth resistor and a sixth resistor, and the proportional operational circuit includes a second operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, wherein,
one end of the fifth resistor is used as the input end of the voltage division circuit, and one end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the sixth resistor is grounded;
the other end of the seventh resistor is electrically connected with the non-inverting input end of the second operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with the inverting input end of the second operational amplifier;
the other end of the seventh resistor is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is grounded;
the other end of the eighth resistor is electrically connected with one end of the tenth resistor;
the other end of the tenth resistor is electrically connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is used as the output end of the proportional operational circuit.
In a preferred embodiment, the resistance value of the seventh resistor is equal to the resistance value of the ninth resistor.
In a preferred embodiment, the second operational amplifier is ADA 4096.
In the preferred embodiment, the ADA4096 is a rail-to-rail operational amplifier with input overvoltage protection, and no inversion or latch-up occurs for a range of voltages higher or lower than the supply rail within 32V. When the acquisition end is suddenly disconnected or other problems cause overlarge acquisition voltage, overvoltage protection can be carried out on the testing device.
In a preferred embodiment, the leakage current mobile phone remote device further comprises a data storage, and an input end of the data storage is electrically connected to the second output end of the microprocessor chip.
In the preferred embodiment, the data memory is used for storing the value of the grounding current of the iron core of the transformer.
In a preferred embodiment, the leakage current handset remote device further comprises a first zener diode and a second zener diode, wherein,
the anode of the first voltage stabilizing diode is electrically connected with the output end of the low-pass filter circuit;
the cathode of the first voltage stabilizing diode is connected with a power supply;
the cathode of the second voltage stabilizing diode is electrically connected with the output end of the low-pass filter circuit;
and the anode of the second voltage stabilizing diode is grounded.
In the preferred embodiment, the first zener diode and the second zener diode provide a voltage stabilizing function.
In a preferred embodiment, the analog-to-digital conversion module is AD 7920.
In a preferred scheme, the operational amplifier, the analog-to-digital conversion module and the micro-processing chip all use the same power supply.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention effectively realizes the detection and protection of the main transformer by utilizing the voltage division circuit and the proportional operation circuit to sample and analyze the grounding current of the main transformer; and because the operational amplifier, the analog-to-digital conversion module and the microprocessing chip all use a unified power supply, a related voltage transformation circuit is omitted, and the device has a simpler structure and a smaller volume.
Drawings
FIG. 1 is a block diagram of an embodiment.
FIG. 2 is a circuit diagram of a low pass filter according to an embodiment.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a leakage current handset remote device is installed at a grounding current end of an iron core of a transformer, and comprises a voltage dividing circuit, a proportional operation circuit, a low pass filter circuit, an AD7920, a first zener diode, a second zener diode, a 2G communication module, an MSP430F149 and a TF card, wherein,
the input end of the voltage division circuit is electrically connected with the grounding current end of the iron core of the transformer;
the voltage division circuit provides input voltage drop for the proportional operation circuit;
the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit;
the output end of the low-pass filter circuit is electrically connected with the input end of the AD 7920;
the anode of the first voltage stabilizing diode is electrically connected with the output end of the low-pass filter circuit;
the cathode of the first voltage stabilizing diode is connected with a 5V power supply;
the cathode of the second voltage stabilizing diode is electrically connected with the output end of the low-pass filter circuit;
the anode of the second voltage stabilizing diode is grounded;
the output end of the AD7920 is electrically connected with the input end of the MSP430F 149;
a first output terminal of the MSP430F149 is electrically connected with an input terminal of the TF card;
a second output of the MSP430F149 is electrically connected to an input of the 2G communication module;
as shown in fig. 2, the low pass filter circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, a first capacitor, and a first operational amplifier,
one end of the second resistor is used as the input end of the low-pass filter circuit, and the other end of the second resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the inverting input end of the first operational amplifier is grounded;
the other end of the second resistor is electrically connected with one end of the third resistor;
the other end of the second resistor is electrically connected with one end of the first resistor;
the other end of the first resistor is electrically connected with the output end of the first operational amplifier;
the other end of the third resistor is electrically connected with the anode of the first diode;
the other end of the third resistor is electrically connected with the cathode of the second diode;
the cathode of the first diode is electrically connected with the anode of the second diode;
the other end of the third resistor is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is grounded;
the other end of the fourth resistor is electrically connected with the anode of the second diode;
the other end of the third resistor is electrically connected with one end of the first capacitor;
the other end of the first capacitor is electrically connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is used as the output end of the low-pass filter circuit;
the resistance values of the first resistor, the second resistor and the third resistor are all equal;
the parameters of the first diode and the second diode are the same.
Wherein, the voltage division circuit comprises a fifth resistor and a sixth resistor, the proportional operation circuit comprises a second operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, wherein,
one end of the fifth resistor is used as the input end of the voltage division circuit, and one end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the sixth resistor is grounded;
the other end of the seventh resistor is electrically connected with the non-inverting input end of the ADA 4096;
the other end of the fifth resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with the inverting input end of the ADA 4096;
the other end of the seventh resistor is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is grounded;
the other end of the eighth resistor is electrically connected with one end of the tenth resistor;
the other end of the tenth resistor is electrically connected with the output end of the ADA4096, and the output end of the ADA4096 is used as the output end of the proportional operation circuit;
the resistance value of the seventh resistor is equal to the resistance value of the ninth resistor.
The working process of the embodiment is as follows:
the grounding current of the iron core of the transformer is subjected to voltage division through the voltage division circuit, then further voltage division is performed through the proportional operation circuit, and filtering is performed through the low-pass filter circuit. The resulting filtered signal is passed through a pair of zener diodes and transmitted to the MSP430F 149. The MSP430F149 carries out linear conversion according to the filtering signal to obtain a numerical value of the grounding current of the iron core of the transformer, judges the iron core of the transformer, sends the numerical value of the grounding current of the iron core of the transformer to a handheld terminal of a remote worker through the 2G communication module, and the TF card stores the numerical value of the grounding current of the iron core of the transformer.
The same or similar reference numerals correspond to the same or similar parts;
the terms describing positional relationships in the drawings are for illustrative purposes only and are not to be construed as limiting the patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A leakage current mobile phone remote device is arranged at a grounding current end of an iron core of a transformer and is characterized by comprising a voltage division circuit, a proportional operation circuit, a low-pass filter circuit, an analog-to-digital conversion module, a wireless communication module and a micro-processing chip, wherein,
the input end of the voltage division circuit is electrically connected with the grounding current end of the iron core of the transformer;
the voltage division circuit provides input voltage drop for the proportional operation circuit;
the output end of the proportional operation circuit is electrically connected with the input end of the low-pass filter circuit;
the output end of the low-pass filter circuit is electrically connected with the input end of the analog-to-digital conversion module;
the output end of the analog-to-digital conversion module is electrically connected with the input end of the micro-processing chip;
and the first output end of the micro-processing chip is electrically connected with the input end of the wireless communication module.
2. The leakage current handset remote device of claim 1, wherein said low pass filter circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first diode, a second diode, a first capacitor, a first operational amplifier, wherein,
one end of the second resistor is used as the input end of the low-pass filter circuit, and the other end of the second resistor is electrically connected with the non-inverting input end of the first operational amplifier;
the inverting input end of the first operational amplifier is grounded;
the other end of the second resistor is electrically connected with one end of a third resistor;
the other end of the second resistor is electrically connected with one end of the first resistor;
the other end of the first resistor is electrically connected with the output end of the first operational amplifier;
the other end of the third resistor is electrically connected with the anode of the first diode;
the other end of the third resistor is electrically connected with the cathode of the second diode;
the cathode of the first diode is electrically connected with the anode of the second diode;
the other end of the third resistor is electrically connected with one end of the fourth resistor;
the other end of the fourth resistor is grounded;
the other end of the fourth resistor is electrically connected with the anode of the second diode;
the other end of the third resistor is electrically connected with one end of the first capacitor;
the other end of the first capacitor is electrically connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is used as the output end of the low-pass filter circuit.
3. The leakage current handset remote of claim 2, wherein the first resistor, the second resistor, and the third resistor are all of equal resistance.
4. The leakage current handset remote apparatus according to claim 2 or 3, wherein the first diode and the second diode have the same parameters.
5. The leakage current handset remote device according to claim 4, wherein the voltage divider circuit comprises a fifth resistor and a sixth resistor, and the proportional operational circuit comprises a second operational amplifier, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor, wherein,
one end of the fifth resistor is used as the input end of the voltage division circuit, and one end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the fifth resistor is electrically connected with one end of the seventh resistor;
the other end of the sixth resistor is grounded;
the other end of the seventh resistor is electrically connected with the non-inverting input end of the second operational amplifier;
the other end of the fifth resistor is electrically connected with one end of the eighth resistor;
the other end of the eighth resistor is electrically connected with the inverting input end of the second operational amplifier;
the other end of the seventh resistor is electrically connected with one end of the ninth resistor;
the other end of the ninth resistor is grounded;
the other end of the eighth resistor is electrically connected with one end of the tenth resistor;
the other end of the tenth resistor is electrically connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is used as the output end of the proportional operational circuit.
6. The leakage current handset remote device of claim 5, wherein the resistance of the seventh resistor is equal to the resistance of the ninth resistor.
7. The leakage current handset remote device of claim 5 or 6, wherein the second operational amplifier is ADA 4096.
8. The leakage current handset remote device of claim 7 further comprising a first zener diode and a second zener diode, wherein,
the anode of the first voltage stabilizing diode is electrically connected with the output end of the low-pass filter circuit;
the cathode of the first voltage stabilizing diode is connected with a power supply;
the cathode of the second voltage stabilizing diode is electrically connected with the output end of the low-pass filter circuit;
and the anode of the second voltage stabilizing diode is grounded.
9. The leakage current handset remote device of claim 1, 2, 3, 5, 6 or 8, further comprising a data memory, wherein an input of said data memory is electrically connected to the second output of said microprocessor chip.
10. The leakage current handset remote of claim 9, wherein the analog to digital conversion module is AD 7920.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810716886.8A CN110672912A (en) | 2018-07-03 | 2018-07-03 | Leakage current mobile phone remote device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810716886.8A CN110672912A (en) | 2018-07-03 | 2018-07-03 | Leakage current mobile phone remote device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110672912A true CN110672912A (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810716886.8A Pending CN110672912A (en) | 2018-07-03 | 2018-07-03 | Leakage current mobile phone remote device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110672912A (en) |
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2018
- 2018-07-03 CN CN201810716886.8A patent/CN110672912A/en active Pending
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