CN114994443B - Transformer neutral point DC magnetic bias current measuring instrument - Google Patents

Transformer neutral point DC magnetic bias current measuring instrument Download PDF

Info

Publication number
CN114994443B
CN114994443B CN202210639422.8A CN202210639422A CN114994443B CN 114994443 B CN114994443 B CN 114994443B CN 202210639422 A CN202210639422 A CN 202210639422A CN 114994443 B CN114994443 B CN 114994443B
Authority
CN
China
Prior art keywords
temperature
box
current sensor
sensor
measuring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202210639422.8A
Other languages
Chinese (zh)
Other versions
CN114994443A (en
Inventor
徐碧川
李唐兵
晏年平
胡睿智
陈�田
刘玉婷
王亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Zgd Electric Power Technology Co ltd
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
Original Assignee
Anhui Zgd Electric Power Technology Co ltd
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
Filing date
Publication date
Application filed by Anhui Zgd Electric Power Technology Co ltd, Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd filed Critical Anhui Zgd Electric Power Technology Co ltd
Priority to CN202210639422.8A priority Critical patent/CN114994443B/en
Publication of CN114994443A publication Critical patent/CN114994443A/en
Application granted granted Critical
Publication of CN114994443B publication Critical patent/CN114994443B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a transformer neutral point direct current magnetic bias current measuring instrument, which comprises a measuring box and a temperature regulating box, wherein a screen shaft is arranged between the measuring box and the temperature regulating box, a flow guiding shutter is arranged through a front box body of the temperature regulating box, heat dissipation shutters are arranged at the lower ends of two side box bodies penetrating through the measuring box, an inserting plate mechanism is arranged inside the measuring box and below the front box body penetrating through the measuring box, hexagon socket bolts are arranged at the centers of the front end and the rear end of the inserting plate mechanism, four storage grooves are formed in the side, close to one side, of a top box body penetrating through the measuring box, of an embedded computer is arranged at the other side, and a sensor B interface is arranged at the top end of the measuring box and at one side behind the embedded computer; the invention is convenient for adjusting the temperature, avoiding the influence of the environmental temperature on the service life of each component of the current measuring instrument, and simultaneously is convenient for the current measuring instrument to adapt to wider grounding bars and is convenient for the maintenance and replacement of the main board.

Description

Transformer neutral point DC magnetic bias current measuring instrument
Technical Field
The invention relates to the field of transformer direct-current magnetic bias current measurement, in particular to a transformer neutral point direct-current magnetic bias current measuring instrument.
Background
In recent years, ultra-high voltage direct current transmission is widely applied to long-distance transmission in China due to the economical and efficient characteristics, as more and more direct current transmission lines are put into operation, the problem of influence of direct current transmission on an alternating current transformer in a monopole earth loop and bipolar unbalanced operation mode is increasingly highlighted, monitoring of the direct current magnetic bias condition of the transformer and solving of the influence of the direct current magnetic bias condition on the transformer become common knowledge of more students and experts, and qualitative and quantitative researches on the influence and treatment of direct current magnetic bias by technicians of various institutions are currently underway.
The existing transformer neutral point direct current magnetic bias current measuring instrument has certain defects when in use, the existing transformer neutral point direct current magnetic bias current measuring instrument is limited by external temperature when in use, the measurement accuracy of the current measuring instrument can be influenced by the fact that the external temperature is too high or too low, the service life of each part of a measuring box can be influenced by using the measuring instrument at high temperature or low temperature, meanwhile, the traditional measuring instrument is large in limitation like a direct current clamp meter, calipers are small and cannot adapt to wider grounding bars, in addition, a main board of the existing measuring instrument is arranged in the measuring box, the measuring box must be integrally removed by maintenance or replacement, time is long and troublesome, and a certain influence is brought to practical use.
Disclosure of Invention
The invention aims to provide a transformer neutral point direct current magnetic bias current measuring instrument, which solves the technical problems that when the existing transformer neutral point direct current magnetic bias current measuring instrument is used, the limitation of external temperature is met, the measurement accuracy of the current measuring instrument is influenced by the fact that the external temperature is too high or too low, the service life of each part of a measuring box is influenced by using the measuring instrument at high temperature or low temperature, meanwhile, the limitation of the traditional measuring instrument such as a direct current clamp meter is large, a caliper is smaller and the traditional measuring instrument cannot adapt to a wider grounding bar, in addition, a main board of the existing measuring instrument is arranged in the measuring box, and the measuring box needs to be integrally removed for maintenance or replacement of the main board, so that the time is long and troublesome.
The aim of the invention can be achieved by the following technical scheme:
The utility model provides a transformer neutral point direct current magnetic bias current measuring apparatu, includes measuring box and temperature regulating box, install the screen axle between measuring box and the temperature regulating box, the water conservancy diversion shutter is installed to the front box that runs through the temperature regulating box, the heat dissipation shutter is all installed to the both sides box that runs through the measuring box near the lower extreme, measuring box's inside and run through measuring box front box and install picture peg mechanism down, the front and back end that runs through picture peg mechanism all installs hexagon socket head cap bolts near both sides in the middle, four storage tanks have been seted up near one side to the top box that runs through the measuring box, the embedded computer is installed near the opposite side on the top of measuring box, sensor B interface is installed to the top of measuring box and be located the rear one side of embedded computer, sensor A interface is installed on the top of measuring box and the rear of sensor B interface;
the utility model discloses a temperature control device, including temperature control module, temperature control fan, temperature control module's inside is installed near bottom one corner, the heating wire is installed in the front of temperature control module, the inside of temperature control module installs the guide fan in the middle of, the mount back of guide fan installs a plurality of semiconductor refrigeration piece in the front of having set gradually current sensor B, the connecting wire, current sensor A and power cord from front to back in four storage tanks, the back box that runs through the temperature control module installs the dust screen, the inside of temperature control module is installed near bottom one corner, the heating wire is installed in the front of dust screen, the inside of temperature control module is installed in the middle of the guide fan.
As a further scheme of the invention, the plugboard mechanism comprises a closing plate, connecting pieces are arranged at the centers of two sides of the closing plate, a carrying plate is arranged at the back of the closing plate near the lower end, sliding grooves are arranged at the centers of two sides of the carrying plate, nine mounting holes which are arranged in a three-by-three matrix are formed in the upper end and the lower end of the carrying plate in a penetrating manner, a main board is arranged in the measuring box and is positioned at the upper end of the carrying plate, and the main board is connected with the carrying plate in a clamping manner through the mounting holes.
As a further scheme of the invention, the current sensor A comprises two sensing half frames which are vertically and symmetrically arranged, frame lugs are arranged on two sides of each sensing half frame, the same butterfly-shaped fixing bolt is arranged at the upper end and the lower end of each frame lug penetrating through the two frame lugs on the same side, a connecting port is arranged at the middle of the front surface of each sensing half frame at the lower end, and the structure of the current sensor B is the same as that of the current sensor A.
As a further scheme of the invention, a power jack and a power switch are arranged at the top end of the measuring box and positioned at one side of the grounding terminal, a stylus groove is formed in a position penetrating through the top end of the measuring box and positioned between the embedded computer and the storage groove, a stylus is arranged in the stylus groove, a computer switch and a USB interface are arranged at one side of the top surface of the embedded computer, and the measuring box and the temperature regulating box are arranged in an openable and closable manner.
As a further scheme of the invention, the heating wires are spirally arranged on the front surface of the dustproof net, the plurality of semiconductor refrigerating sheets are spirally arranged on the back surface of the guide fan fixing frame, and the heating wires, the guide fan and the semiconductor refrigerating sheets are electrically connected with the temperature control module.
As a further scheme of the invention, the flashboard mechanism is connected with the measuring box through a connecting piece matched with an inner hexagon bolt, and the flashboard mechanism is in a drawable arrangement.
As a further scheme of the invention, the specific using steps of the transformer neutral point DC bias current measuring instrument are as follows:
Step one: when the temperature sensor is used, firstly, the current measuring instrument is placed at a safe and stable position near a measured grounding bar and is opened, then the grounding wire is connected with the ground wire through the grounding terminal, then the power wire is taken out from the storage groove and is inserted into the power jack and is connected with the power supply, then the power switch is opened, the temperature sensor senses the ambient temperature and transmits temperature data to the main board and the temperature control module, if the ambient temperature is higher than the highest using temperature of the current measuring instrument or the temperature is lower than the lowest allowable using temperature of the current measuring instrument, the alarm is given out by the alarm, at the moment, the temperature control module regulates and controls the electric heating wire, the flow guiding fan and the semiconductor refrigerating sheet according to the ambient temperature and the allowable using temperature range of the current measuring instrument, the temperature of the area between the electric heating wire and the semiconductor refrigerating sheet is regulated and is close to the ambient temperature by the cooperation of the electric heating wire and the semiconductor refrigerating sheet, then the air flow is guided by the flow guiding fan, the air passes through the surface where the electric heating wire and the semiconductor refrigerating sheet are located after passing through the dustproof network, finally, the window direction of the flow guiding shutter is blown out, and the temperature of the window is regulated to be higher than the temperature of the semiconductor refrigerating sheet or the semiconductor refrigerating sheet, and the temperature is more convenient to cool the window temperature is higher than the temperature of the inside the window.
Step two: taking out a connecting wire, screwing one end of the connecting wire onto a connecting port on the current sensor A, screwing the other end of the connecting wire onto a sensor A interface, selectively using the current sensor A and the current sensor B according to the number and the width of the grounding rows, wherein the wiring mode of the current sensor B is the same as that of the current sensor A, but the connecting wire is required to be connected onto the sensor B interface, after the connection of the current sensor A and the current sensor B with a measuring box is completed, connecting the current sensor A and the current sensor B onto the grounding rows, when the width between the grounding rows is large, unscrewing two butterfly-shaped fixing bolts in the current sensor A by adopting a method shared by the current sensor A and the current sensor B, unlocking frame lugs, clamping two sensing half frames onto one row of the grounding rows, reinstalling the butterfly-shaped fixing bolts, screwing the butterfly-shaped fixing bolts, and installing the current sensor B onto the other row in the same way, and completing the installation of the current sensor A and the current sensor B;
Step three: the method comprises the steps of pressing a computer switch on an embedded computer to start the embedded computer, automatically starting acquisition software, displaying a current value on an interface in the form of numbers and waveforms, storing the value in a database at certain intervals, storing the value once in five seconds by default, performing touch control by using a touch control pen in a touch pen groove when the interface of the embedded computer is operated, logging out of the software after measurement is completed, pressing the computer switch on the embedded computer to shut down, and pressing a power switch to turn off a power supply after the embedded computer is shut down;
Step four: when maintaining or changing the mainboard, demolish two hexagon socket head cap bolts earlier and release the locking to picture peg mechanism, withhold the shrouding again and take picture peg mechanism out from measuring box along the direction of spout, later maintain the mainboard on the embarkation board, if need the mainboard change, demolish the mainboard from the embarkation board, the new mainboard is installed on the embarkation board to the cooperation mounting hole again, and on being connected to the mainboard with measuring box inside the circuit line that is pulled out according to original position, push into measuring box with picture peg mechanism together with the mainboard at last, install two hexagon socket head cap bolts again can.
The invention has the beneficial effects that:
1. According to the invention, the temperature sensor, the heating wire, the guide fan, the semiconductor refrigerating sheet and the temperature control module are arranged, the temperature sensor senses the ambient temperature and transmits temperature data to the main board and the temperature control module, if the ambient temperature is higher than the highest use temperature of the current measuring instrument or lower than the lowest allowable use temperature of the current measuring instrument, the alarm gives an alarm, at the moment, the temperature control module regulates and controls the heating wire, the guide fan and the semiconductor refrigerating sheet according to the ambient temperature and in combination with the allowable use temperature range of the current measuring instrument, the temperature of the area between the heating wire and the semiconductor refrigerating sheet is regulated and controlled to be close to the ambient temperature by utilizing the cooperation of the heating wire and the semiconductor refrigerating sheet, the air flow is guided by the guide fan, the air flows through the dustproof net and then through the surface of the heating wire and the semiconductor refrigerating sheet, and finally the window direction of the guide shutter is regulated, so that the air isothermal with the temperature of the area between the heating wire and the semiconductor refrigerating sheet is blown to each part on the measuring box, the working temperature of each part is not excessively high or excessively low, the temperature of each part is convenient to regulate the temperature of each part, and the service life of the measuring instrument is avoided;
2. The current sensor A and the current sensor B are connected to the grounding row through the arrangement of the current sensor A and the current sensor B, when the width between the grounding rows is large, the two butterfly-shaped fixing bolts in the current sensor A are unscrewed and detached by adopting a method shared by the current sensor A and the current sensor B, locking of the frame lugs is released, the two sensing half frames are clamped on one row of the grounding rows, the butterfly-shaped fixing bolts are reinstalled and screwed, the current sensor B is installed on the other row in the same mode, and installation of the current sensor A and the current sensor B is completed, so that the wider grounding row can be conveniently adapted;
3. Through setting up picture peg mechanism, when maintaining or changing the mainboard, demolish two hexagon socket head cap bolts earlier and release the locking to picture peg mechanism, withhold the shrouding again and take out picture peg mechanism along the direction of spout from measuring box, later maintain the mainboard on the embarkation board, if need the mainboard change, demolish the mainboard from embarkation board, the new mainboard is installed on embarkation board to the installing hole of cooperation again, and the circuit line that will measure the inside quilt of case and pull out is connected to the mainboard according to original position, push into measuring box with picture peg mechanism together with the mainboard at last, install two hexagon socket head cap bolts again can, the maintenance and the change of mainboard of being convenient for.
4. According to the invention, the temperature sensor, the heating wire, the flow guide fan, the semiconductor refrigerating sheet and the temperature control module are mutually matched, so that the temperature can be conveniently adjusted, the influence of the ambient temperature on the service life of each component of the current measuring instrument is avoided, the current measuring instrument is conveniently adapted to a wider grounding bar through the arrangement of the current sensor A and the current sensor B, and the maintenance and replacement of a main board are conveniently realized through the arrangement of the plugboard mechanism.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a transformer neutral point DC bias current measuring instrument according to the present invention;
FIG. 2 is a top view showing the overall structure of a transformer neutral point DC bias current measuring instrument according to the present invention;
FIG. 3 is a side view showing the internal structure of a temperature regulating box in a transformer neutral point DC bias current measuring instrument according to the present invention;
FIG. 4 is a schematic diagram of a structure of a plug board mechanism in a transformer neutral point DC bias current measuring instrument according to the present invention;
fig. 5 is a schematic diagram of a structure of a current sensor a in a transformer neutral point dc bias current measuring apparatus according to the present invention.
In the figure: 1. a measuring box; 2. a temperature regulating box; 3. a deflector louver; 4. a heat dissipation louver; 5. the plugboard mechanism; 6. an inner hexagon bolt; 7. a storage groove; 8. a sensor A interface; 9. a sensor B interface; 10. a power line; 11. a current sensor A; 12. a connecting wire; 13. a current sensor B; 14. an embedded computer; 15. an alarm; 16. a ground terminal; 17. heating wires; 18. a guide fan; 19. a semiconductor refrigeration sheet; 20. a sealing plate; 21. a connecting piece; 22. a mounting board; 23. a mounting hole; 24. a chute; 25. a sensing half frame; 26. a frame ear; 27. butterfly-shaped fixing bolts; 28. a connection port; 29. a dust screen; 30. a temperature control module; 31. a temperature sensor.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, a dc bias current measuring apparatus for a neutral point of a transformer includes a measuring box 1 and a temperature adjusting box 2, a screen shaft is installed between the measuring box 1 and the temperature adjusting box 2, a flow guiding shutter 3 is installed through a front box of the temperature adjusting box 2, heat dissipating shutters 4 are installed through both side boxes of the measuring box 1 near lower ends, a socket board mechanism 5 is installed through the inside of the measuring box 1 near lower sides of the front box of the measuring box 1, hexagon socket bolts 6 are installed through the front and rear ends of the socket board mechanism 5 near both sides, four receiving slots 7 are provided near one side of a top box of the measuring box 1, an embedded computer 14 is installed near the other side of the top of the measuring box 1, a sensor B interface 9 is installed at one side of the rear of the embedded computer 14, and a sensor a interface 8 is installed at the rear of the sensor B interface 9 at the top of the measuring box 1;
The same alarm 15 is installed on the top end of the measuring box 1 and on one side of the sensor A interface 8 and the sensor B interface 9, the temperature sensor 31 is installed on the top end of the measuring box 1 and on one side of the alarm 15, the grounding terminal 16 is installed on one side of the top end of the measuring box 1 and on one side of the temperature sensor 31, the current sensor B13, the connecting wire 12, the current sensor A11 and the power wire 10 are sequentially arranged in the four storage grooves 7 from front to back, the dustproof net 29 is installed on the back box body penetrating through the temperature adjusting box 2, the temperature control module 30 is installed on one corner of the bottom end in the interior of the temperature adjusting box 2, the heating wire 17 is installed on the front face of the dustproof net 29, the guide fan 18 is installed in the middle in the interior of the temperature adjusting box 2, and a plurality of semiconductor refrigerating sheets 19 are installed on the back of the fixing frame of the guide fan 18.
In this scheme, for the maintenance and the change of mainboard of being convenient for have set up picture peg mechanism 5, picture peg mechanism 5 includes shrouding 20, and connecting piece 21 is all installed in the middle of the both sides of shrouding 20, and the back of shrouding 20 is close to the lower extreme and is installed and carry board 22, and spout 24 has all been seted up in the middle of the both sides of carrying board 22, has been seted up to the upper and lower end that runs through carrying board 22 and has been three by nine mounting holes 23 of three matrix arrangement, and the inside of measuring box 1 just is located carrying board 22's upper end and installs the mainboard, and the mainboard passes through mounting hole 23 and carries board 22 joint.
In this scheme, for being convenient for measure and set up current sensor A11 and current sensor B13, current sensor A11 includes two upper and lower symmetrical arrangement's sensing half-frames 25, and frame ear 26 is all installed to the both sides of sensing half-frame 25, runs through the upper and lower extreme that is located two frame ears 26 of same one side and installs same butterfly gim peg 27, and connector 28 is installed in the middle of the front of the sensing half-frame 25 that is located the lower extreme near the lower extreme, and current sensor B13's structure is the same with current sensor A11.
In this scheme, in order to be convenient for the power supply of electric current measuring apparatu, power jack and switch are installed on the top of measuring box 1 and lie in one side of ground terminal 16, and the stylus groove has been seted up to the position that runs through the top of measuring box 1 and lie in between embedded computer 14 and the storage tank 7, and the inside in stylus groove is provided with the stylus, and computer switch and USB interface are installed to the top surface of embedded computer 14 by one side, are openable and closable setting between measuring box 1 and the temperature regulating box 2.
In this scheme, in order to be convenient for adjust the temperature, heating wire 17 is the spiral at the front of dust screen 29 and arranges, and a plurality of semiconductor refrigeration piece 19 is the spiral at the back of water conservancy diversion fan 18 mount, and heating wire 17, water conservancy diversion fan 18 and semiconductor refrigeration piece 19 all are with temperature control module 30 electric connection.
In this scheme, for installation and dismantlement of picture peg mechanism 5, picture peg mechanism 5 is connected with measuring box 1 through connecting piece 21 cooperation hexagon socket head cap screw 6, and picture peg mechanism 5 is the pull setting.
When the transformer neutral point DC magnetic bias current measuring instrument is used, firstly, the current measuring instrument is placed at a safe and stable position near a measured grounding bar, the current measuring instrument is turned on, then the grounding wire is connected through a grounding terminal 16, then the power wire 10 is taken out from the storage groove 7, inserted into a power jack and connected with a power supply, then a power switch is turned on, a temperature sensor 31 senses the ambient temperature and transmits temperature data to a main board and a temperature control module 30, if the ambient temperature is higher than the highest use temperature of the current measuring instrument or lower than the lowest allowable use temperature of the current measuring instrument, an alarm 15 gives an alarm, and at the moment, the temperature control module 30 gives an alarm to a heating wire 17 according to the ambient temperature and in combination with the allowable use temperature range of the current measuring instrument, The flow guiding fan 18 and the semiconductor refrigerating sheet 19 are regulated and controlled, the temperature of the area between the heating wire 17 and the semiconductor refrigerating sheet 19 is regulated and controlled to be close to the ambient temperature by utilizing the cooperation of the heating wire 17 and the semiconductor refrigerating sheet 19 and is in the temperature range allowed by the current measuring instrument, then the air flow is guided by the flow guiding fan 18, the air passes through the dustproof net 29 and then passes through the surface where the heating wire 17 and the semiconductor refrigerating sheet 19 are positioned, finally the air is blown out by the flow guiding louver 3, the window direction of the flow guiding louver 3 is regulated, the air isothermal with the temperature of the area between the heating wire 17 and the semiconductor refrigerating sheet 19 is blown to each part on the measuring box 1, The temperature of each component is regulated to ensure that the working temperature of each component is not too high or too low, meanwhile, the opening and closing degree of the heat dissipation louver 4 is regulated according to the ambient temperature, the opening degree of the heat dissipation louver 4 is larger when the temperature is higher, the opening degree of the heat dissipation louver 4 is smaller when the temperature is lower, the heat dissipation or heat preservation inside the measuring box 1 is convenient, the connecting wire 12 is taken out, one end of the connecting wire 12 is screwed onto the connecting port 28 on the current sensor A11, the other end is screwed onto the sensor A interface 8, the current sensor A11 and the current sensor B13 are selectively used according to the number and the width of the grounding rows, wherein the wiring mode of the current sensor B13 is the same as that of the current sensor A11, But needs to be connected to the sensor B interface 9, after the connection of the current sensor A11 and the current sensor B13 with the measuring box 1 is completed, the current sensor A11 and the current sensor B13 are connected to the grounding rows, when the width between the grounding rows is large, the two butterfly-shaped fixing bolts 27 in the current sensor A11 are unscrewed and removed by adopting a method shared by the current sensor A11 and the current sensor B13, the locking of the frame lugs 26 is released, the two sensing half frames 25 are clamped on one row of the grounding rows, the butterfly-shaped fixing bolts 27 are reinstalled and screwed, the current sensor B13 is installed on the other row in the same way, The installation of the current sensor A11 and the current sensor B13 is completed, a computer switch on the embedded computer 14 is pressed to start the embedded computer 14, acquisition software is automatically started, current values are displayed on an interface in the form of numbers and waveforms, the values are stored in a database at certain intervals, the values are stored once in five seconds by default, a touch pen in a touch pen groove is adopted to perform touch control when the interface of the embedded computer 14 is operated, after the measurement is completed, the software is withdrawn firstly, then a computer switch on the embedded computer 14 is pressed to shut down, and when the power switch is pressed to cut off the power supply after the embedded computer 14 is closed, and the mainboard is maintained or replaced, The two hexagon socket bolts 6 are removed firstly to unlock the flashboard mechanism 5, then the flashboard mechanism 5 is pulled out of the measuring box 1 along the direction of the sliding groove 24 by the buckling sealing plate 20, then the main board on the carrying plate 22 is maintained, if the main board is required to be replaced, the main board is removed from the carrying plate 22, then a new main board is installed on the carrying plate 22 by matching with the installation holes 23, a circuit wire pulled out of the measuring box 1 is connected to the main board according to the original position, and finally the flashboard mechanism 5 and the main board are pushed into the measuring box 1 together, and the two hexagon socket bolts 6 are reinstalled.
According to the invention, the temperature sensor 31, the heating wire 17, the flow guiding fan 18, the semiconductor refrigerating sheet 19 and the temperature control module 30 are arranged, the temperature sensor 31 senses the ambient temperature and transmits temperature data to the main board and the temperature control module 30, if the ambient temperature is higher than the highest use temperature of the current measuring instrument or the temperature is lower than the lowest allowable use temperature of the current measuring instrument, the alarm 15 gives an alarm, at the moment, the temperature control module 30 regulates and controls the heating wire 17, the flow guiding fan 18 and the semiconductor refrigerating sheet 19 according to the ambient temperature in combination with the allowable use temperature interval of the current measuring instrument, the temperature of the area between the heating wire 17 and the semiconductor refrigerating sheet 19 is regulated and controlled to be close to the ambient temperature by utilizing the cooperation of the heating wire 17 and the semiconductor refrigerating sheet 19, the temperature in the allowable use temperature interval of the current measuring instrument is conducted by the flow guiding fan 18, the air flows through the surface of the heating wire 17 and the semiconductor refrigerating sheet 19 after passing through the dust-proof net 29, finally, the window direction of the heating wire 3 is regulated, the temperature of the air box 1 isothermal with the area between the heating wire 17 and the semiconductor refrigerating sheet 19 is blown out, and the temperature of each component is regulated and the temperature of each component on the temperature box is regulated, and the temperature of each component is not influenced by the temperature measuring instrument is prevented from being influenced by the temperature, and the temperature of each component is not influenced by the temperature regulation; the current sensor A11 and the current sensor B13 are connected to the grounding rows, when the width between the grounding rows is large, the two butterfly-shaped fixing bolts 27 in the current sensor A11 are unscrewed and detached to unlock the frame lugs 26, the two sensing half frames 25 are clamped on one of the grounding rows, the butterfly-shaped fixing bolts 27 are reinstalled and screwed, and the current sensor B13 is installed on the other grounding row in the same manner, so that the installation of the current sensor A11 and the current sensor B13 is completed, and the wider grounding rows can be conveniently adapted; through setting up picture peg mechanism 5, when maintaining or changing the mainboard, demolish two hexagon socket head cap bolts 6 earlier and release the locking to picture peg mechanism 5, withhold movable closing plate 20 again and take picture peg mechanism 5 out from measuring box 1 along the direction of spout 24, later maintain the mainboard on carrying plate 22, if need the mainboard change, demolish the mainboard from carrying plate 22, install new mainboard on carrying plate 22 again in cooperation with mounting hole 23, and connect measuring box 1 inside pulled out the circuit line to the mainboard according to original position, push into measuring box 1 together with picture peg mechanism 5 at last, install two hexagon socket head cap bolts 6 again can, the maintenance and the change of mainboard of being convenient for.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.

Claims (1)

1. A transformer neutral point direct current magnetic bias current measuring instrument is characterized in that: the intelligent temperature control device comprises a measuring box (1) and a temperature adjusting box (2), wherein a screen shaft is arranged between the measuring box (1) and the temperature adjusting box (2), a diversion shutter (3) is arranged on the front box body penetrating through the temperature adjusting box (2), heat dissipation shutters (4) are arranged on the lower ends of the box bodies on the two sides penetrating through the measuring box (1), a plugboard mechanism (5) is arranged on the lower sides of the front box body penetrating through the measuring box (1), hexagon socket bolts (6) are arranged on the front end and the rear end of the plugboard mechanism (5) on the centers of the two sides, four storage grooves (7) are formed on the sides of the box bodies on the top end penetrating through the measuring box (1), an embedded computer (14) is arranged on the other side of the top end of the measuring box (1), a sensor B interface (9) is arranged on one side of the rear of the top end of the embedded computer (14), and a sensor A interface (8) is arranged on the rear side of the sensor B interface (9);
The intelligent temperature control device is characterized in that the same alarm (15) is arranged at the top end of the measuring box (1) and positioned at one side of the sensor A interface (8) and the sensor B interface (9), a temperature sensor (31) is arranged at the top end of the measuring box (1) and positioned at one side of the alarm (15), a grounding terminal (16) is arranged at the top end of the measuring box (1) and positioned at one side of the temperature sensor (31), a current sensor B (13), a connecting wire (12), a current sensor A (11) and a power wire (10) are sequentially arranged in the four storage grooves (7) from front to back, a dustproof net (29) is arranged on a back box body penetrating through the temperature adjusting box (2), a temperature control module (30) is arranged at one corner of the inner side of the temperature adjusting box (2), an electric heating wire (17) is arranged on the front side of the dustproof net (29), a guide fan (18) is arranged in the middle of the inner part of the temperature adjusting box (2), and a plurality of semiconductor sheets (19) are arranged on the back of a fixing frame of the guide fan (18);
The plugboard mechanism (5) comprises a closing plate (20), connecting pieces (21) are arranged at the centers of two sides of the closing plate (20), a carrying plate (22) is arranged at the lower end of the back of the closing plate (20), sliding grooves (24) are formed in the centers of two sides of the carrying plate (22), nine mounting holes (23) which are arranged in a three-by-three matrix manner are formed in the upper end and the lower end of the carrying plate (22) in a penetrating manner, a main board is arranged in the measuring box (1) and is positioned at the upper end of the carrying plate (22), and the main board is connected with the carrying plate (22) in a clamping manner through the mounting holes (23);
The current sensor A (11) comprises two sensing half frames (25) which are vertically and symmetrically arranged, frame lugs (26) are arranged on two sides of each sensing half frame (25), the same butterfly-shaped fixing bolt (27) is arranged at the upper end and the lower end of each frame lug (26) which penetrates through the same side, a connecting port (28) is arranged at the center of the front surface of each sensing half frame (25) at the lower end near the lower end, and the structure of the current sensor B (13) is the same as that of the current sensor A (11);
The intelligent temperature control device is characterized in that a power jack and a power switch are arranged at the top end of the measuring box (1) and positioned at one side of the grounding terminal (16), a stylus groove is formed in a position penetrating through the top end of the measuring box (1) and positioned between the embedded computer (14) and the storage groove (7), a stylus is arranged in the stylus groove, the computer switch and a USB interface are arranged on one side of the top surface of the embedded computer (14), the measuring box (1) and the temperature adjusting box (2) are arranged in an openable manner, an electric heating wire (17) is spirally arranged on the front surface of the dust screen (29), a plurality of semiconductor refrigerating sheets (19) are spirally arranged on the back surface of the fixing frame of the guide fan (18), the electric heating wire (17), the guide fan (18) and the semiconductor refrigerating sheets (19) are electrically connected with the temperature control module (30), the plug board mechanism (5) is connected with the measuring box (1) through a connecting piece (21) in a matched mode of an inner hexagonal bolt (6), and the plug board mechanism (5) is in a drawable manner;
The specific using steps of the transformer neutral point direct current magnetic bias current measuring instrument are as follows:
Step one: when the device is used, firstly, the current measuring instrument is placed at a safe and stable position near a tested grounding row and is opened, then the grounding wire is connected through the grounding terminal (16), then the power wire (10) is taken out from the storage groove (7) and is plugged into the power jack and is connected with the power supply, then the power switch is opened, the temperature sensor (31) senses the ambient temperature and transmits temperature data to the main board and the temperature control module (30), if the ambient temperature is higher than the highest use temperature of the current measuring instrument or the temperature is lower than the lowest allowable use temperature of the current measuring instrument, the alarm (15) gives an alarm, at the moment, the temperature control module (30) regulates and controls the heating wire (17), the flow guiding fan (18) and the semiconductor refrigerating sheet (19) according to the ambient temperature and in combination with the allowable use temperature range of the current measuring instrument, the temperature of the heating wire (17) and the semiconductor refrigerating sheet (19) is matched, the temperature of the area between the heating wire (17) and the semiconductor refrigerating sheet (19) is regulated and controlled to be close to the ambient temperature in the allowable use temperature range of the current measuring instrument, then the air flow guiding fan (18) is led to the air flow through the air guiding window (29) and the air guiding window (3) is blown out through the air guiding window (3) at the end after the air guiding window (19), the temperature of the air which is isothermal with the temperature of the area between the heating wire (17) and the semiconductor refrigerating sheet (19) is blown to each part on the measuring box (1), the temperature of each part is regulated, the working temperature of each part is not too high or too low, meanwhile, the opening and closing degree of the radiating louver (4) is regulated according to the ambient temperature, the opening degree of the radiating louver (4) is larger when the temperature is higher, the opening degree of the radiating louver (4) is smaller when the temperature is lower, and the internal heat dissipation or heat preservation of the measuring box (1) is convenient;
Step two: taking out a connecting wire (12), screwing one end of the connecting wire (12) onto a connecting port (28) on a current sensor A (11), screwing the other end of the connecting wire onto a sensor A interface (8), selectively using the current sensor A (11) and a current sensor B (13) according to the number and the width of the grounding rows, unscrewing two butterfly fixing bolts (27) in the current sensor A (11) in the same way as the current sensor A (11), but needing to be connected onto a sensor B interface (9), completing the connection of the current sensor A (11) and the current sensor B (13) with a measuring box (1), connecting the current sensor A (11) and the current sensor B (13) onto the grounding rows, and when the width between the grounding rows is larger, screwing down two butterfly fixing bolts (27) in the current sensor A (11) and the current sensor B (13), releasing the locking of a frame (26), clamping the two butterfly fixing bolts (27) on the two butterfly fixing bolts and installing the current sensor A (13) on the other butterfly fixing bolts (27), and then installing the current sensor A (13) on the other butterfly fixing bolts (13) in the same way;
Step three: the method comprises the steps of pressing a computer switch on an embedded computer (14) to start the embedded computer (14), automatically starting acquisition software, displaying current values on an interface in the form of numbers and waveforms, storing the values in a database at certain intervals, storing the values once in five seconds by default, performing touch control by using a touch pen in a touch pen groove when the interface of the embedded computer (14) is operated, logging out of the software after measurement is completed, pressing the computer switch on the embedded computer (14) to shut down, and pressing a power switch to disconnect a power supply after the embedded computer (14) is shut down;
Step four: when maintaining or changing the mainboard, demolish two hexagon socket head cap screws (6) earlier and release the locking to picture peg mechanism (5), withhold movable closing plate (20) and take picture peg mechanism (5) out from measuring box (1) along the direction of spout (24), later maintain the mainboard on carrying board (22), if need mainboard change, demolish the mainboard from carrying board (22), install new mainboard on carrying board (22) again cooperation mounting hole (23), and connect the circuit line that measuring box (1) inside was pulled out to the mainboard according to original position, push into measuring box (1) together with the mainboard picture peg mechanism (5) at last, install two hexagon socket head cap screws (6) again can.
CN202210639422.8A 2022-06-07 Transformer neutral point DC magnetic bias current measuring instrument Active CN114994443B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210639422.8A CN114994443B (en) 2022-06-07 Transformer neutral point DC magnetic bias current measuring instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210639422.8A CN114994443B (en) 2022-06-07 Transformer neutral point DC magnetic bias current measuring instrument

Publications (2)

Publication Number Publication Date
CN114994443A CN114994443A (en) 2022-09-02
CN114994443B true CN114994443B (en) 2024-11-12

Family

ID=

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103197178A (en) * 2013-03-21 2013-07-10 辽宁省电力有限公司电力科学研究院 Device and method of on-line monitoring of transformer direct current magnetic bias
CN212135347U (en) * 2020-07-09 2020-12-11 哈尔滨科学技术职业学院 Computer is with quick-witted case of dismouting of being convenient for
CN112710882A (en) * 2020-12-01 2021-04-27 贵州电网有限责任公司 Batch meter with intelligent anti-electricity-stealing function

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103197178A (en) * 2013-03-21 2013-07-10 辽宁省电力有限公司电力科学研究院 Device and method of on-line monitoring of transformer direct current magnetic bias
CN212135347U (en) * 2020-07-09 2020-12-11 哈尔滨科学技术职业学院 Computer is with quick-witted case of dismouting of being convenient for
CN112710882A (en) * 2020-12-01 2021-04-27 贵州电网有限责任公司 Batch meter with intelligent anti-electricity-stealing function

Similar Documents

Publication Publication Date Title
CN208316141U (en) A kind of drawer type weak current box
CN114994443B (en) Transformer neutral point DC magnetic bias current measuring instrument
CN114994443A (en) Transformer neutral point direct current magnetic bias current measuring instrument
CN114242428B (en) Transformation ratio adjustable current transformer convenient to maintain
CN221746534U (en) Novel cluster type GPU rendering main cabinet
CN221746492U (en) Embedded temperature controller
CN219678190U (en) Charging station power distribution protection measurement and control terminal
CN217789803U (en) Communication network terminal box
CN221353280U (en) Magnetic furnace temperature tester
CN219918066U (en) Ammeter case fixed knot constructs
CN219536735U (en) Cable tunnel grounding circular flow monitoring device with wide measuring range and high precision
CN219935135U (en) High-sensitivity temperature control sensor for intelligent incubator
CN220961827U (en) Electric power engineering instrument detection device
CN219780690U (en) Function test control panel
CN112244680A (en) Concealed band control electric heating towel rack
CN215186079U (en) Smart power grids real-time supervision device
CN221650600U (en) Manual verification device for mutual inductor
CN221124716U (en) Industrial ground resistance data acquisition device
CN219799635U (en) Power load monitoring device
CN218525969U (en) Automatic microcomputer comprehensive protection measurement and control device applied to transformer substation
CN114527301A (en) Test bench for excitation regulation test of generator
CN212727686U (en) Intelligent operation and maintenance machine box
CN216699308U (en) High-temperature early warning distribution box of distribution box safety design
CN208188214U (en) A kind of electric appliances service electric power measurement plate
CN221378208U (en) Glowing filament test device

Legal Events

Date Code Title Description
PB01 Publication
SE01 Entry into force of request for substantive examination
GR01 Patent grant