CN106327842B - Looped netowrk cabinet temperature and current wireless acquisition device and acquisition method thereof - Google Patents
Looped netowrk cabinet temperature and current wireless acquisition device and acquisition method thereof Download PDFInfo
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- CN106327842B CN106327842B CN201610949344.6A CN201610949344A CN106327842B CN 106327842 B CN106327842 B CN 106327842B CN 201610949344 A CN201610949344 A CN 201610949344A CN 106327842 B CN106327842 B CN 106327842B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 33
- 229910052802 copper Inorganic materials 0.000 claims description 18
- 239000010949 copper Substances 0.000 claims description 18
- 238000004891 communication Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 3
- 229920006362 Teflon® Polymers 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000001012 protector Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010125 resin casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The invention relates to a collecting device, in particular to a ring main unit temperature and current wireless collecting device and a collecting method thereof. The cable head comprises a cable head, the cable head in be equipped with the cable, still include the collection locating component who cup joints mutually with the cable, collection locating component's outer wall be equipped with control assembly, cable head and control assembly between be equipped with sensing component. A ring main unit temperature and current wireless acquisition device and an acquisition method thereof are compact in structure, convenient to assemble and disassemble and capable of acquiring data.
Description
Technical Field
The invention relates to a collecting device, in particular to a ring main unit temperature and current wireless collecting device and a collecting method thereof.
Background
At present, a wired method is generally adopted for collecting the temperature and the current of the ring main unit, and high-voltage and low-voltage isolation cannot be effectively realized; the infrared method is more convenient to collect temperature, but the power supply problem and the accurate optical communication problem need to be considered when collecting current, the result is complex, and the installation and maintenance are inconvenient; part of wireless acquisition methods use batteries for power supply, the batteries are frequently replaced, and the danger of high-temperature battery explosion exists; and in part of wireless acquisition methods, closed coils are used for getting electricity, so that the installation and maintenance are difficult.
Disclosure of Invention
The invention mainly solves the defects in the prior art, and provides a ring main unit temperature and current wireless acquisition device and an acquisition method thereof, wherein the ring main unit temperature and current wireless acquisition device has a compact structure, can be installed without disassembling and assembling a primary loop, is convenient to install, works in an oversaturated state, is used for providing a power supply for a circuit board and measuring the working current of a circuit, and has the advantages of compact structure, capability of realizing open-close type ring iron core outer winding enameled wire structure, no need of disassembling and assembling a primary loop, and convenience in installation.
The technical problem of the invention is mainly solved by the following technical scheme:
a temperature and current wireless acquisition device for a ring main unit comprises a cable head, wherein a cable is arranged in the cable head, and the temperature and current wireless acquisition device also comprises an acquisition positioning component sleeved with the cable;
the collecting and positioning assembly comprises a left half-coil shell and a right half-coil shell, the left half-coil shell and the right half-coil shell are movably connected in a matching mode, coils are arranged in the left half-coil shell and the right half-coil shell respectively, the two coils are communicated through two-hole plug connectors, a cable clamp is arranged in the middle of the left half-coil shell and the right half-coil shell, and the cable is positioned through the cable clamp;
the control assembly comprises a control box, a control circuit board is arranged in the control box, and the two-hole plug connector is connected with the control circuit board;
the sensing assembly comprises three hole plug connectors which are connected with a control circuit board in an inserting mode, the three hole plug connectors are connected with a temperature sensor through wires, and the temperature sensor is arranged in a cable head.
Preferably, the left half-coil shell comprises a left half-coil bottom shell, a left half-coil cover plate matched with the left half-coil bottom shell is arranged at the upper part of the left half-coil bottom shell, and the coil is arranged in the left half-coil bottom shell; the right half coil shell comprises a right half coil bottom shell, the upper part of the right half coil bottom shell is provided with a right half coil cover plate matched and connected with the right half coil bottom shell, and the coil is arranged in the right half coil bottom shell; the left half-coil bottom shell and the right half-coil bottom shell are movably positioned through copper shaft sleeves; the control box is arranged at the outer end of the bottom shell of the right half coil.
Preferably, the control box comprises a control box bottom shell, the control circuit board is arranged in the control box bottom shell, a control box top cover is arranged at the outer end of the control box bottom shell, and a control button connected with the control circuit board is arranged in the control box top cover.
Preferably, the control circuit board comprises a microprocessor, a voltage stabilizing circuit, a current collecting circuit, a temperature collecting circuit, a wireless communication module, an overvoltage and overcurrent protection circuit, an opening and closing type coil, a thermistor and a high-precision current transformer, wherein the voltage stabilizing circuit, the current collecting circuit and the temperature collecting circuit are respectively in one-way connection with the microprocessor, and the wireless communication module is in two-way connection with the microprocessor; the overvoltage and overcurrent protection circuit is in one-way connection with the voltage stabilizing circuit, and the high-precision current transformer is in one-way connection with the current acquisition circuit; the thermistor is in one-way connection with the temperature acquisition circuit; the open-close type coil is respectively connected with the overvoltage and overcurrent protection circuit and the high-precision current transformer in a one-way mode.
A collecting method of a ring main unit temperature and current wireless collecting device is carried out according to the following steps:
(1) and assembling:
the acquisition positioning assembly, the control assembly and the sensing assembly are assembled to ensure that the assembly is error-free and can be normally used;
manufacturing a coil: uniformly winding the enameled copper wire on a semicircular iron core, wherein the enameled copper wire needs to be compact and uniform, and copper wire joints with certain lengths are uniformly distributed from the left half coil and the right half coil;
fixing a coil: firstly, a connector of a left half-coil enameled copper wire is transmitted into a lead connecting hole of a bottom shell of a left coil and then penetrates through a copper shaft sleeve; then connecting the other joint of the left half-coil enameled copper wire by 1.5mm2After the Teflon high-temperature wire is conductedThen is connected with the two-hole connector; then, the left half coil is placed in the bottom shell of the left coil, and the position is adjusted to ensure that the opening of the iron core is flush with the opening of the bottom shell; finally, the coil is fixed by epoxy resin casting, and the uniform casting is carried out without generating air bubbles. After 24 hours, the epoxy resin is completely solidified, the left half-coil cover plate is buckled on the bottom shell, and the left half-coil cover plate is completely clamped by aiming at the pins; the right half coil and the left half coil are assembled and fixed in the same process;
coil final assembly: placing the left half-coil belt bottom shell on a platform, inserting a copper shaft sleeve into a splicing hole of the left half-coil bottom shell, aligning the splicing hole of the right half-coil bottom shell with the copper shaft sleeve, then sleeving the copper shaft sleeve into the splicing hole of the right half-coil bottom shell, clamping a cable at the inner side of the coil bottom shell, paying attention to the fact that the opening direction is opposite to the direction of the copper shaft sleeve, and finally respectively penetrating two fixing screws M4 and 16 into opening fixing holes at two ends of the left and right bottom shells and screwing the fixing screws tightly;
assembling a control circuit board: firstly, placing a control circuit board in a bottom shell of a control panel, and aligning to an opening of a connector; then fixing the control circuit board in the bottom shell of the control panel by using four M3 x 6 screws; then, inserting 3 LEDs connected with the leads of the control circuit board into the indicating lamp holes of the top cover of the control board, paying attention to the moderate and consistent height, and fixing the LEDs by using glass cement; finally, the control panel top cover is buckled on the control panel bottom shell, and 2M 4 screws penetrate through 2 holes at the bottom end of the control panel top cover and are fixed on the control panel bottom shell;
final assembly: 2M 4 x 65 screws penetrate through 2 holes in the upper end of the top cover of the control plate, then penetrate through the bottom shell of the control plate and fixing holes in the left half-coil base, and are fixed by using gaskets and nuts;
(2) and mounting a collecting device:
screwing out M4X 16 screws at two ends of the half-coil shell and the right half-coil shell, enabling the left half-coil shell and the right half-coil shell to be in a separated state, enabling the cable clamp to be in a separated state, clamping the cable into the cable clamp, properly rotating the cable clamp to enable the cable to be completely attached to the cable clamp, placing the cable clamp in the left half-coil shell and the right half-coil shell, and fixing the left half-coil shell and the right half-coil shell through the M4X 16 screws; the temperature sensor is fixed on the cable head;
(3) and data acquisition:
when the current value of the primary lead is larger than 10A, the open-close type high-precision current transformer mounted on the primary lead induces current, is protected by an over-voltage and over-current protection circuit and is stabilized to Vcc =3.3V by a voltage stabilizing circuit to supply power to all chips on a circuit board; a current loop induced by the open-close type current transformer needs to pass through the small current transformer, a high-precision current signal induced by the small current transformer is processed into a 0-3.3V voltage signal through a current sampling circuit, the voltage signal is sent to an ADC pin of the microprocessor for sampling, a current value is obtained, the current measurement range is 10-2000A, and the measurement precision is +/-1%;
the temperature sensor adopts a PT100 thermistor, and is sent to a microprocessor for ADC sampling after being output through a temperature sampling circuit, and a temperature value is obtained through calculation, wherein the temperature measuring range is-30-220 ℃, and the temperature measuring precision is +/-1 ℃;
the microprocessor calculates the working current value of the ring main unit and the temperature value of the cable head, judges whether short circuit or overtemperature fixation exists or not, and displays fault information on site if the fault exists, and lights the corresponding light-emitting diode;
meanwhile, the microprocessor also sends the acquired current value, temperature value and fault information to the monitoring host of the low-voltage side in a wireless mode through the wireless communication module, so that the effective electrical isolation of the high-voltage side and the low-voltage side is realized. The maximum wireless transmitting power of the acquisition device can reach 0dBm, the working current does not exceed 20mA, the wireless communication distance in an open area can reach 50 meters, and the communication distance can still exceed 10 meters after the acquisition device passes through a 1-layer metal screen protector.
The temperature probe is sleeved with a metal sleeve, fixed on the cable head and connected to the control circuit board through a high-temperature metal lead.
The shell is made of polycarbonate material and has the characteristics of firmness, high temperature resistance and insulation.
The interior epoxy resin is poured, and the structure is fully insulated and sealed, and is dustproof and waterproof.
The open-close type installation mode is simple without disassembling and assembling the cable once; the cable clamp is made of rubber materials, has good flexibility and high friction coefficient, increases the fixing reliability and the applicability of cables with different diameters, and can effectively buffer the vibration generated when the ring main unit is opened and closed.
Therefore, the ring main unit temperature and current wireless acquisition device and the acquisition method thereof have the advantages of compact structure, convenience in disassembly and assembly and data acquisition.
Drawings
FIG. 1 is a schematic illustration of an explosive structure according to the present invention;
FIG. 2 is a schematic view of the assembled structure of the present invention;
FIG. 3 is a schematic structural view of the acquisition positioning assembly of the present invention;
FIG. 4 is a schematic view of a cable clamp according to the present invention;
fig. 5 is a control block diagram of the control circuit board in the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example 1: as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the ring main unit temperature and current wireless acquisition device comprises a cable head 1, wherein a cable 2 is arranged in the cable head 1, the ring main unit temperature and current wireless acquisition device further comprises an acquisition positioning component sleeved with the cable 2, a control component is arranged on the outer wall of the acquisition positioning component, and a sensing component is arranged between the cable head 1 and the control component;
the collecting and positioning assembly comprises a left half-coil shell and a right half-coil shell, the left half-coil shell and the right half-coil shell are movably connected in a matching mode, coils 3 are arranged in the left half-coil shell and the right half-coil shell respectively, the two coils 3 are communicated through two-hole plug connectors 4, a cable clamp 5 is arranged in the middle of the left half-coil shell and the right half-coil shell, and the cable 2 is positioned through the cable clamp 5;
the control assembly comprises a control box, a control circuit board 6 is arranged in the control box, and the two-hole plug connector 4 is connected with the control circuit board 6;
the sensing assembly comprises three hole plug connectors 7 which are connected with the control circuit board 6 in an inserting mode, the three hole plug connectors 7 are connected with the temperature sensor 8 through wires, and the temperature sensor 8 is arranged in the cable head 5.
The left half-coil shell comprises a left half-coil bottom shell 9, a left half-coil cover plate 10 matched with the left half-coil bottom shell 9 is arranged at the upper part of the left half-coil bottom shell 9, and the coil 3 is arranged in the left half-coil bottom shell 9; the right half coil shell comprises a right half coil bottom shell 11, a right half coil cover plate 12 matched and connected with the right half coil bottom shell 11 is arranged at the upper part of the right half coil bottom shell 11, and the coil 3 is arranged in the right half coil bottom shell 11; the left half coil bottom shell 9 and the right half coil bottom shell 11 are movably positioned through a copper shaft sleeve 13; the control box is arranged at the outer end of the right half coil bottom shell 11.
The control box comprises a control box bottom shell 14, the control circuit board 6 is arranged in the control box bottom shell 14, a control box top cover 15 is arranged at the outer end of the control box bottom shell 14, and a control button 16 connected with the control circuit board 6 is arranged in the control box top cover 15.
The control circuit board 6 comprises a microprocessor 17, a voltage stabilizing circuit 18, a current collecting circuit 19, a temperature collecting circuit 20, a wireless communication module 21, an overvoltage and overcurrent protection circuit 22, an opening-closing coil 23, a thermistor 24 and a high-precision current transformer 25, wherein the voltage stabilizing circuit 18, the current collecting circuit 19 and the temperature collecting circuit 20 are respectively in one-way connection with the microprocessor 17, and the wireless communication module 21 is in two-way connection with the microprocessor 17; the overvoltage and overcurrent protection circuit 22 is in one-way connection with the voltage stabilizing circuit 18, and the high-precision current transformer 25 is in one-way connection with the current acquisition circuit 19; the thermistor 24 is connected with the temperature acquisition circuit 20 in a unidirectional way; the open-close type coil 23 is respectively connected with the overvoltage and overcurrent protection circuit 22 and the high-precision current transformer 25 in a one-way mode.
A collecting method of a ring main unit temperature and current wireless collecting device is carried out according to the following steps:
(1) and assembling:
the acquisition positioning assembly, the control assembly and the sensing assembly are assembled to ensure that the assembly is error-free and can be normally used;
manufacturing a coil: uniformly winding the enameled copper wire on a semicircular iron core, wherein the enameled copper wire needs to be compact and uniform, and copper wire joints with certain lengths are uniformly distributed from the left half coil and the right half coil;
fixing a coil: firstly, a connector of a left half-coil enameled copper wire is transmitted into a lead connecting hole of a bottom shell of a left coil and then penetrates through a copper shaft sleeve; then connecting the other joint of the left half-coil enameled copper wire by 1.5mm2The Teflon high-temperature lead is connected with the two-hole connector; then, the left half coil is placed in the bottom shell of the left coil, and the position is adjusted to ensure that the opening of the iron core is flush with the opening of the bottom shell; finally, the coil is fixed by epoxy resin casting, and the uniform casting is carried out without generating air bubbles. After 24 hours, the epoxy resin is completely solidified, the left half-coil cover plate is buckled on the bottom shell, and the left half-coil cover plate is completely clamped by aiming at the pins; the right half coil and the left half coil are assembled and fixed in the same process;
coil final assembly: placing the left half-coil belt bottom shell on a platform, inserting a copper shaft sleeve into a splicing hole of the left half-coil bottom shell, aligning the splicing hole of the right half-coil bottom shell with the copper shaft sleeve, then sleeving the copper shaft sleeve into the splicing hole of the right half-coil bottom shell, clamping a cable at the inner side of the coil bottom shell, paying attention to the fact that the opening direction is opposite to the direction of the copper shaft sleeve, and finally respectively penetrating two fixing screws M4 and 16 into opening fixing holes at two ends of the left and right bottom shells and screwing the fixing screws tightly;
assembling a control circuit board: firstly, placing a control circuit board in a bottom shell of a control panel, and aligning to an opening of a connector; then fixing the control circuit board in the bottom shell of the control panel by using four M3 x 6 screws; then, inserting 3 LEDs connected with the leads of the control circuit board into the indicating lamp holes of the top cover of the control board, paying attention to the moderate and consistent height, and fixing the LEDs by using glass cement; finally, the control panel top cover is buckled on the control panel bottom shell, and 2M 4 screws penetrate through 2 holes at the bottom end of the control panel top cover and are fixed on the control panel bottom shell;
final assembly: 2M 4 x 65 screws penetrate through 2 holes in the upper end of the top cover of the control plate, then penetrate through the bottom shell of the control plate and fixing holes in the left half-coil base, and are fixed by using gaskets and nuts;
(4) and mounting a collecting device:
screwing out M4X 16 screws at two ends of the half-coil shell and the right half-coil shell, enabling the left half-coil shell and the right half-coil shell to be in a separated state, enabling the cable clamp to be in a separated state, clamping the cable into the cable clamp, properly rotating the cable clamp to enable the cable to be completely attached to the cable clamp, placing the cable clamp in the left half-coil shell and the right half-coil shell, and fixing the left half-coil shell and the right half-coil shell through the M4X 16 screws; the temperature sensor is fixed on the cable head;
(5) and data acquisition:
when the current value of the primary lead is larger than 10A, the open-close type high-precision current transformer mounted on the primary lead induces current, is protected by an over-voltage and over-current protection circuit and is stabilized to Vcc =3.3V by a voltage stabilizing circuit to supply power to all chips on a circuit board; a current loop induced by the open-close type current transformer needs to pass through the small current transformer, a high-precision current signal induced by the small current transformer is processed into a 0-3.3V voltage signal through a current sampling circuit, the voltage signal is sent to an ADC pin of the microprocessor for sampling, a current value is obtained, the current measurement range is 10-2000A, and the measurement precision is +/-1%;
the temperature sensor adopts a PT100 thermistor, and is sent to a microprocessor for ADC sampling after being output through a temperature sampling circuit, and a temperature value is obtained through calculation, wherein the temperature measuring range is-30-220 ℃, and the temperature measuring precision is +/-1 ℃;
the microprocessor calculates the working current value of the ring main unit and the temperature value of the cable head, judges whether short circuit or overtemperature fixation exists or not, and displays fault information on site if the fault exists, and lights the corresponding light-emitting diode;
meanwhile, the microprocessor also sends the acquired current value, temperature value and fault information to the monitoring host of the low-voltage side in a wireless mode through the wireless communication module, so that the effective electrical isolation of the high-voltage side and the low-voltage side is realized. The maximum wireless transmitting power of the acquisition device can reach 0dBm, the working current does not exceed 20mA, the wireless communication distance in an open area can reach 50 meters, and the communication distance can still exceed 10 meters after the acquisition device passes through a 1-layer metal screen protector.
Claims (2)
1. The utility model provides a looped netowrk cabinet temperature and wireless collection system of electric current, includes cable head (1), cable head (1) in be equipped with cable (2), its characterized in that: the cable head is characterized by also comprising an acquisition positioning component sleeved with the cable (2), wherein the outer wall of the acquisition positioning component is provided with a control component, and a sensing component is arranged between the cable head (1) and the control component;
the collecting and positioning assembly comprises a left half-coil shell and a right half-coil shell, the left half-coil shell and the right half-coil shell are movably connected in a matching mode, coils (3) are arranged in the left half-coil shell and the right half-coil shell respectively, the two coils (3) are communicated through two-hole plug connectors (4), a cable clamp (5) is arranged in the middle of the left half-coil shell and the right half-coil shell, and the cable (2) is positioned through the cable clamp (5);
the control assembly comprises a control box, a control circuit board (6) is arranged in the control box, and the two-hole plug connector (4) is connected with the control circuit board (6);
the sensing assembly comprises a three-hole plug connector (7) which is plugged with the control circuit board (6), the three-hole plug connector (7) is connected with a temperature sensor (8) through a lead, and the temperature sensor (8) is arranged in the cable head (5);
the left half-coil shell comprises a left half-coil bottom shell (9), a left half-coil cover plate (10) matched and connected with the left half-coil bottom shell (9) is arranged at the upper part of the left half-coil bottom shell (9), and the coil (3) is arranged in the left half-coil bottom shell (9); the right half coil shell comprises a right half coil bottom shell (11), the upper part of the right half coil bottom shell (11) is provided with a right half coil cover plate (12) matched and connected with the right half coil bottom shell (11), and the coil (3) is arranged in the right half coil bottom shell (11); the left half-coil bottom shell (9) and the right half-coil bottom shell (11) are movably positioned through a copper shaft sleeve (13); the control box is arranged at the outer end of the right half coil bottom shell (11);
the control box comprises a control box bottom shell (14), the control circuit board (6) is arranged in the control box bottom shell (14), a control box top cover (15) is arranged at the outer end of the control box bottom shell (14), and a control button (16) connected with the control circuit board (6) is arranged in the control box top cover (15);
the control circuit board (6) comprises a microprocessor (17), a voltage stabilizing circuit (18), a current collecting circuit (19), a temperature collecting circuit (20), a wireless communication module (21), an overvoltage and overcurrent protection circuit (22), an open-close type coil (23), a thermistor (24) and a high-precision current transformer (25), wherein the voltage stabilizing circuit (18), the current collecting circuit (19) and the temperature collecting circuit (20) are respectively in one-way connection with the microprocessor (17), and the wireless communication module (21) is in two-way connection with the microprocessor (17); the overvoltage and overcurrent protection circuit (22) is in one-way connection with the voltage stabilizing circuit (18), and the high-precision current transformer (25) is in one-way connection with the current acquisition circuit (19); the thermistor (24) is connected with the temperature acquisition circuit (20) in a unidirectional way; the open-close type coil (23) is respectively connected with the overvoltage and overcurrent protection circuit (22) and the high-precision current transformer (25) in a one-way mode.
2. The method for acquiring the ring main unit temperature and current wireless acquisition device according to claim 1, is characterized by comprising the following steps:
(1) and assembling:
the acquisition positioning assembly, the control assembly and the sensing assembly are assembled to ensure that the assembly is error-free and can be normally used;
manufacturing a coil: uniformly winding the enameled copper wire on a semicircular iron core, wherein the enameled copper wire needs to be compact and uniform, and copper wire joints with certain lengths are uniformly distributed from the left half coil and the right half coil;
fixing a coil: firstly, a connector of a left half-coil enameled copper wire is transmitted into a lead connecting hole of a bottom shell of a left coil and then penetrates through a copper shaft sleeve; then connecting the other joint of the left half-coil enameled copper wire by 1.5mm2The Teflon high-temperature lead is connected with the two-hole connector; then, the left half coil is placed in the bottom shell of the left coil, and the position is adjusted to ensure that the opening of the iron core is flush with the opening of the bottom shell; finally, the coil is fixed by epoxy resin in a pouring way, and the coil is poured uniformly without generating bubbles; after 24 hours, the epoxy resin is completely solidified, the left half-coil cover plate is buckled on the bottom shell, and the left half-coil cover plate is completely clamped by aiming at the pins; assembling and fixing process of right half coil and left half coilThe same;
coil final assembly: placing the left half-coil belt bottom shell on a platform, inserting a copper shaft sleeve into a splicing hole of the left half-coil bottom shell, aligning the splicing hole of the right half-coil bottom shell with the copper shaft sleeve, then sleeving the copper shaft sleeve into the splicing hole of the right half-coil bottom shell, clamping a cable at the inner side of the coil bottom shell, paying attention to the fact that the opening direction is opposite to the direction of the copper shaft sleeve, and finally respectively penetrating two fixing screws M4 and 16 into opening fixing holes at two ends of the left and right bottom shells and screwing the fixing screws tightly;
assembling a control circuit board: firstly, placing a control circuit board in a bottom shell of a control panel, and aligning to an opening of a connector; then fixing the control circuit board in the bottom shell of the control panel by using four M3 x 6 screws; then, inserting 3 LEDs connected with the leads of the control circuit board into the indicating lamp holes of the top cover of the control board, paying attention to the moderate and consistent height, and fixing the LEDs by using glass cement; finally, the control panel top cover is buckled on the control panel bottom shell, and 2M 4 screws penetrate through 2 holes at the bottom end of the control panel top cover and are fixed on the control panel bottom shell;
final assembly: 2M 4 x 65 screws penetrate through 2 holes in the upper end of the top cover of the control plate, then penetrate through the bottom shell of the control plate and fixing holes in the left half-coil base, and are fixed by using gaskets and nuts;
(2) and mounting a collecting device:
screwing out M4X 16 screws at two ends of the half-coil shell and the right half-coil shell, enabling the left half-coil shell and the right half-coil shell to be in a separated state, enabling the cable clamp to be in a separated state, clamping the cable into the cable clamp, properly rotating the cable clamp to enable the cable to be completely attached to the cable clamp, placing the cable clamp in the left half-coil shell and the right half-coil shell, and fixing the left half-coil shell and the right half-coil shell through the M4X 16 screws; the temperature sensor is fixed on the cable head;
(3) and data acquisition:
when the current value of the primary lead is larger than 10A, the open-close type high-precision current transformer mounted on the primary lead induces current, is protected by an overvoltage and overcurrent protection circuit and is stabilized to Vcc (3.3V) by a voltage stabilizing circuit to supply power to all chips on a circuit board; a current loop induced by the open-close type current transformer needs to pass through the small current transformer, a high-precision current signal induced by the small current transformer is processed into a 0-3.3V voltage signal through a current sampling circuit, the voltage signal is sent to an ADC pin of the microprocessor for sampling, a current value is obtained, the current measurement range is 10-2000A, and the measurement precision is +/-1%;
the temperature sensor adopts a PT100 thermistor, and is sent to a microprocessor for ADC sampling after being output through a temperature sampling circuit, and a temperature value is obtained through calculation, wherein the temperature measuring range is-30-220 ℃, and the temperature measuring precision is +/-1 ℃;
the microprocessor calculates the working current value of the ring main unit and the temperature value of the cable head, judges whether short circuit or overtemperature fixation exists or not, and displays fault information on site if the fault exists, and lights the corresponding light-emitting diode;
meanwhile, the microprocessor also sends the acquired current value, temperature value and fault information to the monitoring host machine on the low-voltage side in a wireless mode through the wireless communication module, so that the electrical effective isolation of the high-voltage side and the low-voltage side is realized; the maximum wireless transmitting power of the acquisition device can reach 0dBm, the working current does not exceed 20mA, the wireless communication distance in an open area can reach 50 meters, and the communication distance can still exceed 10 meters after the acquisition device passes through a 1-layer metal screen protector.
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| CN201610949344.6A CN106327842B (en) | 2016-10-26 | 2016-10-26 | Looped netowrk cabinet temperature and current wireless acquisition device and acquisition method thereof |
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| CN115183869A (en) * | 2022-07-20 | 2022-10-14 | 华中农业大学 | Photosynthetic active radiation measuring device for plant canopy |
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