CN213457084U - Transformer core grounding current detection device - Google Patents
Transformer core grounding current detection device Download PDFInfo
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- CN213457084U CN213457084U CN202021225770.3U CN202021225770U CN213457084U CN 213457084 U CN213457084 U CN 213457084U CN 202021225770 U CN202021225770 U CN 202021225770U CN 213457084 U CN213457084 U CN 213457084U
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Abstract
The utility model discloses a transformer core ground current detection device, including current sensor, analog-to-digital conversion unit, microprocessor unit, wireless communication unit, memory cell, power module, electro-optical conversion device, optical coupling subassembly, optic fibre, photoelectric sensor and shielding box, current sensor's output is connected the electro-optical conversion device, and the light signal of electro-optical conversion device gets into optic fibre and transmits to photoelectric sensor through the coupling of optical coupling subassembly; the microprocessor unit, the analog-digital conversion unit and the photoelectric sensor are placed in the inner shielding box, the inner shielding box is provided with an opening, and the optical fiber penetrates into the inner shielding box from the outer shielding box through the opening. The utility model has the advantages that: the transformer core grounding current detection device reduces the influence of a complex electromagnetic environment near the transformer on a measuring circuit signal and improves the detection precision of the core current through the arrangement of the double shielding boxes and an electro-optic-electrical signal conversion mechanism.
Description
Technical Field
The utility model relates to a power transformer ground current detection area specifically is a transformer core ground current detection device.
Background
In the case of a power transformer without a neutral point grounded, when there is a phase contact, although the equipment connected to the phase can operate, if the equipment on the phase leaks electricity, a human body directly receives the phase voltage after touching the equipment, and in addition, the voltage to ground of the other two phases without a contact will rise and become unstable, seriously jeopardizing the safety of personnel, equipment and a power supply system. The method for detecting the grounding current of the transformer core is an effective method for monitoring the grounding of the power transformer, and can provide accurate reference data for power operation and maintenance personnel.
Chinese patent grant publication No. CN 204694765U, grant publication date 2015 year 10 month 07 date, discloses a transformer core ground current detection device based on internet of things, which is in communication connection with a transformer core current sensor. The transformer iron core current sensor is arranged on a flat steel grounding wire and used for collecting analog current signals on the grounding wire. This transformer core ground current detection device based on internet of things embeds singlechip control circuit, signal conditioning circuit, clock module, ZIGBEE communication module, data storage circuit, wireless communication module, serial communication interface circuit and the power supply circuit for above-mentioned circuit power supply, and the device can carry out real time monitoring to transformer core electric current through thing networking wireless transmission. However, the electromagnetic environment near the transformer is severe, and the transformer core grounding current detection device in the above patent cannot acquire high signal-to-noise ratio data, so that it is necessary to design a transformer core grounding current detection device capable of working in a complicated electromagnetic environment.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is how to design a transformer core ground current detection device that can be under complicated electromagnetic environment reliable and stable operation.
The utility model discloses a solve the technical scheme that above-mentioned problem adopted and be: a transformer core grounding current detection device comprises a current sensor, an analog-to-digital conversion unit, a microprocessor unit, a wireless communication unit, a storage unit and a power supply module, wherein a signal of the current sensor is processed by the analog-to-digital conversion unit and then transmitted to the microprocessor unit for operation, the storage unit and the wireless communication unit are in communication connection with the microprocessor unit, the device further comprises an electro-optical conversion device, an optical coupling component, an optical fiber, a photoelectric sensor and a shielding box, the output end of the current sensor is connected with the electro-optical conversion device, an optical signal of the electro-optical conversion device is coupled into the optical fiber through the optical coupling component and transmitted to the photoelectric sensor, and the photoelectric sensor is in communication connection with the analog-to-digital; the shielding box includes outer shielding box and interior shielding box, is the electrically conductive metal box of ground connection, place microprocessor unit, analog-to-digital conversion unit and photoelectric sensor in the interior shielding box, place current sensor, electro-optical conversion device and optical coupling subassembly between outer shielding box and the interior shielding box, interior shielding box is equipped with the opening, and optic fibre passes through the opening penetrates in the interior shielding box from the outer shielding box. The outer shielding box can shield most of interference electromagnetic waves near the power transformer, the inner shielding box further reduces noise of the signal processing circuit, the signal to noise ratio of the detection current signal is further improved, in addition, a current sensor and an electro-optical conversion device which are arranged between the outer shielding box and the inner shielding box can convert an electric signal into an optical signal, the optical signal is transmitted to a photoelectric sensor in the inner shielding box through an optical coupling component and an optical fiber, optical signal transmission is used outside the inner shielding box, the interference of complex electromagnetic waves to the signals can be further reduced, in addition, the attenuation of the optical fiber signals is less, and the optical fiber signal attenuation is suitable for long-distance signal transmission.
Preferably, the grounding current detection device for the iron core of the voltage instrument further comprises a low-frequency pulse measurement circuit which is electrically connected with the analog-to-digital conversion unit and used for detecting a low-frequency pulse signal in the inner shielding box. The low-frequency pulse measuring circuit can assist operation and maintenance personnel to judge the data quality of the grounding current of the transformer core, and when the low-frequency pulse signal in the inner shielding box is strong, the reliability of circuit data can be judged to be poor.
Preferably, the electro-optical conversion device is a light emitting diode.
Preferably, the optical coupling assembly comprises an optical fiber fixing disc, a lens barrel and a focusing lens group, wherein the optical fiber fixing disc is fixed at one end of the lens barrel through threads on the inner wall of the lens barrel, the focusing lens group is sleeved at the other end of the lens barrel and faces to the light emitting side of the photodiode, the light beam of the photodiode is focused to the position of the optical fiber core by adjusting the position of the focusing lens group, the focusing lens group comprises a sleeve and a convex lens, and the sleeve is sleeved on the outer side wall of the lens barrel; the sleeve is provided with a threaded hole and a screw, and the screw is used for fixing the sleeve and the lens cone. The optical coupling component is simple in structure and can efficiently couple optical signals generated by the light emitting diode into the fiber core of the optical fiber.
Preferably, the current sensor is a hall current sensor.
Preferably, the microprocessor unit is an STM32L152C8T6 microprocessor. The microprocessor of the model can be low in power consumption and can enable the device to stably run for a long time.
Preferably, the electro-optical sensor is an avalanche photodiode.
Preferably, a fuse is arranged on the grounding wire of the inner shielding box. The fuse is used for overcurrent protection and protecting electronic circuit elements in the inner shielding box.
Preferably, the grounding current detection device for the iron core of the voltage transformer further comprises an antenna box, wherein the antenna box is connected with the wireless communication unit and arranged on the outer side of the outer shielding box.
Preferably, the power supply module is a disposable lithium battery and is arranged between the outer shielding box and the inner shielding box.
The utility model has the advantages that: the transformer core grounding current detection device can reduce the influence of a complex electromagnetic environment near a transformer on a measuring circuit signal to the greatest extent through the arrangement of double shielding boxes and an electro-optic-electrical signal conversion mechanism, and improves the detection precision of the core current.
Drawings
Fig. 1 is a schematic structural view of the present invention, wherein the left side is a perspective view and the right side is a front sectional view.
Fig. 2 is a block diagram of the present invention.
Fig. 3 is an analog-to-digital conversion circuit of the present invention.
Fig. 4 is a schematic diagram of a circuit of a microprocessor unit according to the present invention.
In the figure: 1. the device comprises a current sensor, 2, a shielding box, 3, a circuit module, 4, a power supply module, 5, an antenna box, 6, a light emitting diode, 7, an optical coupling component, 8, an optical fiber, 9, a wireless communication unit, 10, a microprocessor unit, 11, an analog-to-digital conversion unit, 12, a photoelectric sensor, 13, a storage unit, 14, an indicator light, 15 and a low-frequency pulse measuring circuit.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The utility model discloses a solve the technical scheme that above-mentioned problem adopted and be: fig. 1 is the utility model relates to a transformer core ground current detection device's structural schematic diagram, wherein the left side picture is the stereogram, the right side picture is the front section structure picture, the iron core passes current sensor 1, this current sensor is hall current sensor, its output voltage is 0~5V, shielding box 2 is integration design casing, inside has set up the circular iron core cabin, circuit module 3 and power module 4, power module 4 is disposable lithium cell, the complete machine can use the embedment to handle and increase the seal, shielding box 2 side is equipped with antenna box 5, use antenna box 5 to fix the PCB antenna at shielding box 2's surface, the protection antenna does not receive external disturbance. The bottom of the shielding box 2 is provided with an installation lug, so that the field installation is convenient.
Fig. 2 is the utility model relates to a transformer core ground current detection device's structural block diagram, shielding box 2 include outer shielding box 17 and interior shielding box 16, are the conductive metal box of ground connection, wherein, are equipped with the fuse on the earth connection of interior shielding box 16 for overcurrent protection protects the inside electronic circuit component of interior shielding box 16. A current sensor 1, a light emitting diode 6, an optical coupling component 7 and an optical fiber 8 are arranged between an outer shielding box 17 and an inner shielding box 16, the current sensor 1 is a Hall current sensor, the inner shielding box 16 is provided with an opening, and the optical fiber 8 penetrates into the inner shielding box 16 from the inside of the outer shielding box 17 through the opening and is finally connected to the input end of a photoelectric sensor 12 in the inner shielding box 16. The wireless communication unit 9, the microprocessor unit 10, the analog-to-digital conversion unit 11, the photoelectric sensor 12, the storage unit 13, the indicator light 14 and the low-frequency pulse measuring circuit 15 are placed in the inner shielding box 16, the photoelectric sensor 12 is an avalanche photodiode, a PMT or a single photon detector, analog electric signals of the photoelectric detector 12 and the low-frequency pulse detecting circuit 15 are amplified and filtered by the analog-to-digital conversion unit 11 to be converted into digital signals, the low-frequency pulse measuring circuit 15 is used for detecting low-frequency pulse signal period measurement in the inner shielding box, a frequency measuring principle of a counting method is adopted, operation and maintenance personnel can be assisted in judging the data quality of transformer core grounding current, the graph in FIG. 3 is an analog-to-digital conversion circuit diagram of the analog-to-digital conversion unit 11, the digital signals are subjected to data operation by the microprocessor unit 10, the microprocessor model of the microprocessor unit 10 is, the microprocessor of the model can consume low power and can lead the device to operate stably for a long time, and the circuit schematic diagram of the microprocessor is shown in figure 4. The microprocessor unit 10 exchanges data with the outside through the wireless communication unit 9 and the antenna box 5 on the outer shielding box 17, the storage unit 13 and the indicator lamp 14 are connected to the microprocessor unit 10, and the indicator lamp 10 is used for flashing when the number of the low-frequency pulse signals exceeds a set value.
The output voltage of the Hall current sensor 1 is selected to be 0-5V, the output end of the Hall current sensor is connected with a light emitting diode 6 with a wave band of 555-570 nm, the light intensity of the light emitting diode 6 changes along with the output voltage of the Hall current sensor 1, and an optical signal is transmitted to the input end of a photoelectric sensor 12 in an inner shielding box 16 through an optical coupling component 7 and an optical fiber 8. The optical coupling assembly 7 comprises an optical fiber fixing disc, a lens barrel and a focusing lens group, wherein the optical fiber fixing disc is fixed at one end of the lens barrel through threads on the inner wall of the lens barrel, a band-pass filter with a 555-570 nm waveband is arranged in the lens barrel, the focusing lens group is sleeved at the other end of the lens barrel and faces to the light emitting side of the photodiode 6, the light beam of the photodiode 6 is focused to the position of an optical fiber 8 fiber core by adjusting the position of the focusing lens group, the focusing lens group comprises a sleeve and a convex lens, and the sleeve is; the sleeve is provided with a threaded hole and a screw, and the screw is used for fixing the sleeve and the lens cone.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the scope of the claims.
Claims (10)
1. A transformer core grounding current detection device comprises a current sensor, an analog-to-digital conversion unit, a microprocessor unit, a wireless communication unit, a storage unit and a power supply module, wherein the signal of the current sensor is processed by the analog-to-digital conversion unit and then transmitted to the microprocessor unit for operation, and the storage unit and the wireless communication unit are in communication connection with the microprocessor unit, and the transformer core grounding current detection device is characterized by further comprising an electro-optical conversion device, an optical coupling component, an optical fiber, a photoelectric sensor and a shielding box,
the output end of the current sensor is connected with an electro-optical conversion device, an optical signal of the electro-optical conversion device is coupled into an optical fiber through an optical coupling component and is transmitted to the photoelectric sensor, and the photoelectric sensor is in communication connection with the analog-to-digital conversion unit;
the shielding box includes outer shielding box and interior shielding box, is the electrically conductive metal box of ground connection, place microprocessor unit, analog-to-digital conversion unit and photoelectric sensor in the interior shielding box, outer shielding box with place current sensor, electro-optical conversion device and optical coupling subassembly between the interior shielding box, interior shielding box is equipped with the opening, optic fibre passes through the opening penetrates in the interior shielding box from the interior shielding box of outer shielding box.
2. The transformer core grounding current detection device of claim 1, further comprising a low-frequency pulse measurement circuit electrically connected to the analog-to-digital conversion unit for detecting a low-frequency pulse signal in the inner shielding box.
3. The apparatus of claim 1, wherein the electro-optical converter is a light emitting diode.
4. The transformer core grounding current detection device according to claim 3, wherein the optical coupling assembly comprises an optical fiber fixing disc, a lens barrel and a focusing lens group, one end of the lens barrel fixes the optical fiber fixing disc through threads on the inner wall of the lens barrel, the focusing lens group is sleeved at the other end of the lens barrel and faces to the light emitting side of the photodiode, the light beam of the photodiode is focused to the position of the optical fiber core by adjusting the position of the focusing lens group,
the focusing lens group comprises a sleeve and a convex lens, and the sleeve is sleeved on the outer side wall of the lens barrel;
the sleeve is provided with a threaded hole and a screw, and the screw is used for fixing the sleeve and the lens cone.
5. The apparatus of claim 1, wherein the current sensor is a hall current sensor.
6. The transformer core grounding current detection device as claimed in claim 1, wherein the microprocessor unit has a microprocessor model number of STM32L152C8T 6.
7. The apparatus as claimed in claim 1, wherein said photo sensor is an avalanche photodiode.
8. The apparatus of claim 1, wherein a fuse is disposed on a ground line of the inner shielding box.
9. The transformer core grounding current detection device of claim 1, further comprising an antenna box connected to the wireless communication unit and disposed outside the outer shielding box.
10. The transformer core grounding current detection device of claim 1, wherein the power supply module is a disposable lithium battery and is arranged between the outer shielding box and the inner shielding box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021225770.3U CN213457084U (en) | 2020-06-29 | 2020-06-29 | Transformer core grounding current detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021225770.3U CN213457084U (en) | 2020-06-29 | 2020-06-29 | Transformer core grounding current detection device |
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| CN213457084U true CN213457084U (en) | 2021-06-15 |
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| CN202021225770.3U Active CN213457084U (en) | 2020-06-29 | 2020-06-29 | Transformer core grounding current detection device |
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