CN114994443A - Transformer neutral point direct current magnetic bias current measuring instrument - Google Patents
Transformer neutral point direct current magnetic bias current measuring instrument Download PDFInfo
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- 230000017525 heat dissipation Effects 0.000 claims abstract description 11
- 238000012423 maintenance Methods 0.000 claims abstract description 11
- 230000007613 environmental effect Effects 0.000 claims abstract description 6
- 239000004065 semiconductor Substances 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 25
- 238000005057 refrigeration Methods 0.000 claims description 16
- 238000005485 electric heating Methods 0.000 claims description 13
- 239000000428 dust Substances 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 210000005069 ears Anatomy 0.000 claims 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20145—Means for directing air flow, e.g. ducts, deflectors, plenum or guides
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20181—Filters; Louvers
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
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- Microelectronics & Electronic Packaging (AREA)
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- Testing Electric Properties And Detecting Electric Faults (AREA)
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 guide shutter is arranged on a front box body penetrating through the temperature regulating box, heat dissipation shutters are arranged at the lower ends of two side box bodies penetrating through the measuring box, a plug-in plate mechanism is arranged in the measuring box and below the front box body penetrating through the measuring box, inner hexagon bolts are arranged in the middle of the front end and the rear end of the plug-in plate mechanism at two sides, four accommodating grooves are arranged at one side of a top box body penetrating through the measuring box, an embedded computer is arranged at the other side of the top end of the measuring box, and a sensor B interface is arranged at one side of the top end of the measuring box and behind the embedded computer; the invention is convenient for adjusting the temperature, avoids the influence of the environmental temperature on the service life of each component of the current measuring instrument, is convenient for the current measuring instrument to adapt to a wider grounding bar, and is convenient for the maintenance and the replacement of the mainboard.
Description
Technical Field
The invention relates to the field of measurement of direct current magnetic bias current of a transformer, in particular to a transformer neutral point direct current magnetic bias current measuring instrument.
Background
In recent years, ultrahigh voltage direct current transmission is widely applied to long-distance transmission in China due to the characteristics of economy and high efficiency, the problem that direct current transmission influences an alternating current transformer in a single-pole ground loop and double-pole unbalanced operation mode is increasingly highlighted with the operation of more and more direct current transmission lines, the monitoring of the direct current magnetic biasing condition of the transformer and the solving of the influence of the direct current magnetic biasing condition on the transformer become common knowledge of more and more learners and experts, and qualitative and quantitative research on the direct current magnetic biasing influence and treatment by technical personnel of various organizations is in progress at present.
Present transformer neutral point direct current magnetic biasing current measuring apparatu has certain drawback when using, present transformer neutral point direct current magnetic biasing current measuring apparatu is when using, receive ambient temperature's restriction, ambient temperature is too high or low measuring accuracy that all can influence current measuring apparatu excessively, and use the measuring apparatu to influence the life of each part of measuring box under high temperature or low temperature, and simultaneously, traditional measuring apparatu is big like the restriction of DC pincerlike table, the less ground connection row that can not adapt to the broad of calliper, in addition, the inside at the measuring box is installed to the mainboard of present measuring apparatu, the maintenance or change mainboard must wholly demolish the measuring box, it is long and troublesome consuming time, certain influence has been brought for 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 caused, the measurement accuracy of the current measuring instrument is influenced by overhigh or overlow external temperature, 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 traditional measuring instrument has large limitation, a caliper is smaller and 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 whole measuring box needs to be disassembled for maintenance or replacement, so that the time consumption is long and the trouble is caused.
The purpose of the invention can be realized by the following technical scheme:
a transformer neutral point direct current magnetic biasing current measuring instrument 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 guide shutter is arranged on a front box body penetrating through the temperature regulating box, heat dissipation shutters are arranged on two side box bodies penetrating through the measuring box and close to the lower end of the two side box bodies, a plugboard mechanism is arranged in the measuring box and close to the lower part of the front box body penetrating through the measuring box, hexagon socket bolts are arranged on the front end and the rear end of the plugboard mechanism and close to two sides in the middle, four containing grooves are formed in one side of a top box body penetrating through the measuring box and close to one side of the top end of the measuring box, an embedded computer is arranged at one side of the top end of the measuring box and behind the embedded computer, and a sensor A interface is arranged at the top end of the measuring box and behind the sensor B interface;
the utility model discloses a temperature regulation box, including measuring case, temperature regulation box, connecting wire, current sensor A and power cord, the top of measuring case and the one side that is located sensor A interface and sensor B interface are installed same alarm, the top of measuring case and the one side that is located the alarm install temperature sensor, the top of measuring case and the one side that is located temperature sensor install the ground terminal, four are accomodate the groove and have set gradually current sensor B from the front to the back, the connecting wire, current sensor A and power cord, the dust screen is installed to the back box that runs through the temperature regulation box, the temperature control module is installed by bottom one corner to the inside of temperature regulation box, the heating wire is installed in the front of dust screen, the water conservancy diversion fan is installed between two parties to the inside of temperature regulation box, the mount back mounted of water conservancy diversion fan has a plurality of semiconductor refrigeration piece.
As a further scheme of the invention, the plate inserting mechanism comprises a sealing plate, wherein connecting pieces are arranged in the middle of two sides of the sealing plate, a carrying plate is arranged at the back surface of the sealing plate close to the lower end, sliding grooves are arranged in the middle of two sides of the carrying plate, nine mounting holes which are arranged in a three-by-three matrix form penetrate through the upper end and the lower end of the carrying plate, a main plate is arranged in the measuring box and positioned at the upper end of the carrying plate, and the main plate is clamped with the carrying plate through the mounting holes.
As a further scheme of the invention, the current sensor A comprises two sensing half-frames which are symmetrically arranged up and down, 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 two frame lugs which penetrate through the same side, a connector is arranged in the middle of the front surface of the sensing half-frame at the lower end close to 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 installed at one side of the top end of the measuring box and located at the ground terminal, a stylus groove is formed at a position which penetrates through the top end of the measuring box and is located between the embedded computer and the accommodating groove, a stylus is arranged inside the stylus groove, a computer switch and a USB interface are installed 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 side of the dust screen, the plurality of semiconductor refrigerating sheets are spirally arranged on the back side of the flow guide fan fixing frame, and the heating wires, the flow guide fan and the semiconductor refrigerating sheets are electrically connected with the temperature control module.
As a further scheme of the invention, the plate inserting mechanism is connected with the measuring box through a connecting piece matched with an inner hexagon bolt, and the plate inserting mechanism is arranged in a drawing mode.
As a further scheme of the invention, the specific use steps of the transformer neutral point direct current magnetic bias current measuring instrument are as follows:
the method comprises the following steps: when in use, firstly, the current measuring instrument is arranged at a safe and stable position near a tested grounding bar and is switched on, then the current measuring instrument is connected with a grounding wire through a grounding terminal, then a power cord is taken out from the accommodating groove and is inserted into a power supply jack and is switched on, then a power switch is switched on, the temperature sensor senses the environment temperature and transmits temperature data to the mainboard and the temperature control module, if the environment temperature is higher than or lower than the highest or 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 flow guiding fan and the semiconductor refrigerating piece according to the environment temperature and in combination with the allowable use temperature interval of the current measuring instrument, and the temperature in the allowable use temperature interval of the current measuring instrument is regulated and controlled to be close to the environment temperature by utilizing the cooperation of the heating wire and the semiconductor refrigerating piece, guiding air flow by a flow guiding fan, enabling the air to pass through a dustproof net and then pass through the surfaces where the heating wire and the semiconductor refrigerating sheet are located, finally blowing out the air through a flow guiding shutter, adjusting the direction of a window of the flow guiding shutter, enabling the air with the temperature which is the same as that of the area between the heating wire and the semiconductor refrigerating sheet to blow towards each component on the measuring box, and adjusting the temperature of each component to enable the working temperature of each component not to be too high or too low;
step two: taking out the 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 an interface of the sensor A, selectively using the current sensor A and the current sensor B according to the number and the width of the grounding bars, wherein the wiring mode of the current sensor B is the same as that of the current sensor A, but the connecting wire needs to be connected onto the interface of the sensor B, connecting the current sensor A and the current sensor B onto the grounding bars after the connection of the current sensor A and the current sensor B and the measuring box is completed, adopting a method shared by the current sensor A and the current sensor B to unscrew and disassemble two butterfly fixing bolts in the current sensor A when the width between the grounding bars is larger, releasing the locking of frame lugs, clamping the two sensing half frames on one of the grounding bars, reinstalling the butterfly fixing bolts and screwing, then the current sensor B is arranged on the other row in the same way to finish the installation of the current sensor A and the current sensor B;
step three: pressing a computer switch on the embedded computer to start the embedded computer, automatically starting acquisition software, displaying a current value on an interface in a digital and waveform form, storing the value into a database according to a certain interval time, defaulting to once for five seconds, performing touch control by using a touch pen in a touch pen groove when operating the interface of the embedded computer, exiting the software after completing measurement, pressing the computer switch on the embedded computer to shut down, and pressing a power switch to disconnect a power supply after the embedded computer is shut down;
step four: maintenance or when changing the mainboard, demolish two hexagon socket head cap screw earlier and remove the locking to picture peg mechanism, buckle the shrouding again and take picture peg mechanism out from the measuring box along the direction of spout, later maintain the mainboard on the board of carrying, if need the mainboard change, then demolish the mainboard from the board of carrying, the mounting hole of deuterogamying is installed new mainboard on the board of carrying, and be connected to the mainboard according to original position with the circuit line that the measuring box inside was pulled out, push into the measuring box together with the mainboard with picture peg mechanism at last, two hexagon socket head cap screw of reinstallation can.
The invention has the beneficial effects that:
1. the invention is provided with a temperature sensor, an electric heating wire, a diversion fan, a semiconductor refrigeration piece and a temperature control module, wherein the temperature sensor senses the environment temperature and transmits temperature data to a mainboard and the temperature control module, if the environment temperature is higher than or lower than the highest or lowest allowable use temperature of a current measuring instrument, an alarm gives an alarm, the temperature control module regulates and controls the electric heating wire, the diversion fan and the semiconductor refrigeration piece according to the environment temperature and in combination with the allowable use temperature interval of the current measuring instrument, the temperature of the area between the electric heating wire and the semiconductor refrigeration piece is regulated and controlled to be close to the environment temperature by utilizing the matching of the electric heating wire and the semiconductor refrigeration piece and is in the allowable use temperature interval of the current measuring instrument, and air flow is guided by the diversion fan so that the air passes through a dust screen and then passes through the surface where the electric heating wire and the semiconductor refrigeration piece are located, finally, the air is blown out through the flow guide shutter, then the direction of a window of the flow guide shutter is adjusted, so that the air with the temperature which is the same as that of the area between the heating wire and the semiconductor refrigerating sheet is blown to each component on the measuring box, the temperature of each component is adjusted, the working temperature of each component is not too high or too low, the temperature is convenient to adjust, and the influence of the environmental temperature on the service life of each component of the current measuring instrument is avoided;
2. the current sensor A and the current sensor B are connected to the grounding bars by arranging the current sensor A and the current sensor B, when the width between the grounding bars is large, a method shared by the current sensor A and the current sensor B is adopted, two butterfly fixing bolts in the current sensor A are unscrewed and detached, the locking of frame lugs is released, two sensing half frames are clamped on one of the grounding bars, the butterfly fixing bolts are reinstalled and screwed, and the current sensor B is installed on the other grounding bar in the same way, so that the installation of the current sensor A and the current sensor B is completed, and the wide grounding bars are convenient to adapt;
3. through setting up picture peg mechanism, when maintenance or change mainboard, demolish two hexagon socket head cap bolts earlier and remove the locking to picture peg mechanism, buckle the shrouding again and take out picture peg mechanism from the measuring box along the direction of spout, later maintain the mainboard on the board of putting up, if need the mainboard change, then demolish the mainboard from the board of putting up, cooperate the mounting hole again and install new mainboard on the board of putting up, and will measure the inside circuit line that is pulled out of case and be connected to the mainboard according to original position, push the picture peg mechanism in the measuring box together with the mainboard at last, two hexagon socket head cap bolts of reinstallation can, be convenient for the maintenance and the change of mainboard.
4. According to the invention, the temperature sensor, the heating wire, the flow guiding fan, the semiconductor refrigeration sheet and the temperature control module are matched with each other, so that the temperature can be conveniently adjusted, the influence of the environmental temperature on the service life of each component of the current measuring instrument is avoided, the current measuring instrument can be conveniently adapted to a wider grounding bar by arranging the current sensor A and the current sensor B, and the maintenance and replacement of the mainboard are facilitated by arranging the plugboard mechanism.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a transformer neutral point DC magnetic bias current measuring instrument according to the present invention;
FIG. 2 is a top view of the overall structure of a transformer neutral point DC bias current measuring instrument according to the present invention;
FIG. 3 is a side view of the internal structure of a temperature-adjusting box in the transformer neutral point DC magnetic bias current measuring instrument according to the present invention;
FIG. 4 is a schematic structural diagram of a plug plate mechanism in the transformer neutral point DC magnetic bias current measuring instrument according to the present invention;
fig. 5 is a schematic structural diagram of a current sensor a in the transformer neutral point dc magnetic bias current measuring instrument according to the present invention.
In the figure: 1. a measuring box; 2. a temperature regulating box; 3. a flow guide shutter; 4. a heat dissipation louver; 5. a board inserting mechanism; 6. a hexagon socket head cap screw; 7. a receiving groove; 8. a sensor A interface; 9. a sensor B interface; 10. a power line; 11. a current sensor A; 12. connecting wires; 13. a current sensor B; 14. an embedded computer; 15. an alarm; 16. a ground terminal; 17. an electric heating wire; 18. a flow guiding fan; 19. a semiconductor refrigeration sheet; 20. closing the plate; 21. a connecting member; 22. building a support plate; 23. mounting holes; 24. a chute; 25. a sensing half-frame; 26. a frame ear; 27. a butterfly shaped dead bolt; 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 described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, a transformer neutral point dc magnetic bias current measuring instrument 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 body of the temperature adjusting box 2, heat dissipating shutters 4 are installed near lower ends of two side box bodies penetrating the measuring box 1, a board inserting mechanism 5 is installed inside the measuring box 1 and near a lower portion of the front box body penetrating the measuring box 1, hexagon socket head bolts 6 are installed near two sides and centered at front and rear ends penetrating the board inserting mechanism 5, four accommodating grooves 7 are opened near one side of a top box body penetrating the measuring box 1, an embedded computer 14 is installed near the other side of the top end 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 one side of the top end of the measuring box 1 and behind the sensor B interface 9;
the top of measuring box 1 and the one side that is located sensor A interface 8 and sensor B interface 9 install same alarm 15, the top of measuring box 1 and the one side that is located alarm 15 install temperature sensor 31, the top of measuring box 1 and the one side that is located temperature sensor 31 install ground terminal 16, four are accomodate and have been set gradually current sensor B13 from the front to the back in the groove 7, connecting wire 12, current sensor A11 and power cord 10, it installs dust screen 29 to run through the back box of adjusting the temperature case 2, temperature control module 30 is installed by bottom one corner to the inside of adjusting the temperature case 2, heating wire 17 is installed in the front of dust screen 29, the inside of adjusting the temperature case 2 is installed centrally and is had water conservancy diversion fan 18, a plurality of semiconductor refrigeration piece 19 is installed to the mount back of water conservancy diversion fan 18.
In this scheme, in order to facilitate the maintenance and the change of mainboard to set up picture peg mechanism 5, picture peg mechanism 5 includes shrouding 20, connecting piece 21 is all installed between two parties to the both sides of shrouding 20, the board 22 of taking is installed by the lower extreme in the back of shrouding 20, spout 24 has all been seted up between two parties to the both sides of board 22 of taking, run through the upper and lower end of board 22 of taking and set up nine mounting holes 23 that are three by three matrix arrangements, the mainboard is installed to the inside of measuring box 1 and the upper end that is located board 22 of taking, the mainboard passes through mounting hole 23 and board 22 joint of taking.
In the scheme, a current sensor A11 and a current sensor B13 are arranged for measurement, the current sensor A11 comprises two sensing half frames 25 which are symmetrically arranged up and down, frame lugs 26 are arranged on two sides of each sensing half frame 25, the same butterfly fixing bolt 27 is arranged at the upper end and the lower end of each two frame lugs 26 which penetrate through the same side, a connector 28 is arranged in the middle of the front surface of the sensing half frame 25 which is arranged at the lower end and close to the lower end, and the structure of the current sensor B13 is the same as that of the current sensor A11.
In this scheme, for the convenience of current measuring instrument's power supply, electrical socket and switch are installed to the top of measurement box 1 and the one side that is located ground terminal 16, run through the top of measurement box 1 and the position that is located between embedded computer 14 and the storage groove 7 has seted up the touch-pen groove, and the inside in touch-pen groove is provided with the touch-control pen, and computer switch and USB interface are installed by one side to the top surface of embedded computer 14, are the setting that can open and shut between measurement box 1 and the temperature regulating box 2.
In this embodiment, in order to adjust the temperature, the heating wires 17 are arranged spirally on the front surface of the dust screen 29, the plurality of semiconductor cooling fins 19 are arranged spirally on the back surface of the fixing frame of the flow guiding fan 18, and the heating wires 17, the flow guiding fan 18 and the semiconductor cooling fins 19 are all electrically connected to the temperature control module 30.
In the present embodiment, for the installation and the disassembly of the plate inserting mechanism 5, the plate inserting mechanism 5 is connected with the measurement box 1 through the connecting piece 21 in cooperation with the hexagon socket head cap screw 6, and the plate inserting mechanism 5 is arranged in a drawable manner.
When the transformer neutral point direct current 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 and is switched on, then the current measuring instrument is connected with a grounding wire through a grounding terminal 16, then a power cord 10 is taken out from a containing groove 7 and is inserted into a power jack and is powered on, then a power switch is switched on, a temperature sensor 31 senses the environment temperature and transmits temperature data to a main board and a temperature control module 30, if the environment temperature is higher than or lower than the highest or lowest allowable use temperature of the current measuring instrument, an 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 piece 19 according to the environment temperature and 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 piece 19 is regulated and controlled to be close to the environment temperature by utilizing the cooperation of the heating wire 17 and the semiconductor refrigerating piece 19, the temperature of the air flow is within the allowable use temperature range of the current measuring instrument, the air flow is guided by the flow guiding fan 18, the air passes through the dust screen 29 and then passes through the surface where the heating wire 17 and the semiconductor refrigerating sheet 19 are located, and finally is blown out through the flow guiding shutter 3, the window direction of the flow guiding shutter 3 is adjusted, the air with the temperature which is the same as the temperature of the area between the heating wire 17 and the semiconductor refrigerating sheet 19 is blown to each component on the measuring box 1, the temperature of each component is adjusted, the working temperature of each component is not too high or too low, the opening degree of the heat dissipation shutter 4 is adjusted according to the environmental temperature, the opening degree of the heat dissipation shutter 4 is larger when the temperature is higher, the opening degree of the heat dissipation shutter 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, and one end of the connecting wire 12 is screwed on the connecting port 28 on the current sensor A11, the other end is screwed on a sensor A interface 8, a current sensor A11 and a 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 the current sensor B13 needs to be connected on a sensor B interface 9, after the connection between the current sensor A11 and the current sensor B13 and the measuring box 1 is completed, the current sensor A11 and the current sensor B13 are connected on the grounding rows, when the width between the grounding rows is larger, a method shared by the current sensor A11 and the current sensor B13 is adopted, two butterfly fixing bolts 27 in the current sensor A11 are unscrewed and detached, the locking of the frame lugs 26 is released, the two sensing half frames 25 are clamped on one of the grounding rows, the butterfly fixing bolts 27 are remounted and screwed, and the current sensor B13 is installed on the other row in the same mode, 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 a digital and wave form, the values are stored in a database at certain intervals, five-second default storage is performed, a touch pen in a touch pen groove is used for touch control when the interface of the embedded computer 14 is operated, after the measurement is completed, the software is firstly withdrawn, then the computer switch on the embedded computer 14 is pressed to shut down, a power switch is pressed to cut off a power supply after the embedded computer 14 is shut down, when a mainboard is maintained or replaced, two hexagon socket bolts 6 are firstly removed to unlock the plugboard mechanism 5, then the plugboard mechanism 5 is pulled out of the measuring box 1 along the direction of the sliding groove 24 by buckling the hexagon socket bolt 20, then the mainboard on the support board 22 is maintained, if the mainboard needs to be replaced, the mainboard is detached from the carrying plate 22, a new mainboard is mounted on the carrying plate 22 by matching with the mounting hole 23, the circuit line pulled out from the inside of the measuring box 1 is connected to the mainboard according to the original position, and finally, the board inserting mechanism 5 and the mainboard are pushed into the measuring box 1 together, and then the two hexagon socket head cap screws 6 are mounted again.
The invention sets a temperature sensor 31, a heating wire 17, a diversion fan 18, a semiconductor refrigeration piece 19 and a temperature control module 30, the temperature sensor 31 senses the environment temperature and transmits the temperature data to a mainboard and the temperature control module 30, if the environment temperature is higher than or lower than the highest or lowest allowable use temperature of a current measuring instrument, an alarm 15 gives an alarm, the temperature control module 30 regulates and controls the heating wire 17, the diversion fan 18 and the semiconductor refrigeration piece 19 according to the environment temperature and in combination with the allowable use temperature interval of the current measuring instrument, the temperature in the area between the heating wire 17 and the semiconductor refrigeration piece 19 is regulated and controlled to be close to the environment temperature by the cooperation of the heating wire 17 and the semiconductor refrigeration piece 19 and is in the allowable use temperature interval of the current measuring instrument, the air flow is guided by the diversion fan 18, the air passes through a dust-proof net 29 and then passes through the surface where the heating wire 17 and the semiconductor refrigeration piece 19 are located, finally, the air is blown out through the flow guide shutter 3, then the direction of the window of the flow guide shutter 3 is adjusted, so that the air with the same temperature as the area between the heating wire 17 and the semiconductor refrigerating sheet 19 is blown to each component on the measuring box 1, the temperature of each component is adjusted, the working temperature of each component is not too high or too low, the temperature is convenient to adjust, and the influence of the environmental temperature on the service life of each component of the current measuring instrument is avoided; the current sensor A11 and the current sensor B13 are connected to the grounding bars by arranging the current sensor A11 and the current sensor B13, when the width between the grounding bars is large, the method shared by the current sensor A11 and the current sensor B13 is adopted, two butterfly fixing bolts 27 in the current sensor A11 are unscrewed and detached, the frame lugs 26 are unlocked, the two sensing half frames 25 are clamped on one of the grounding bars, the butterfly fixing bolts 27 are remounted and screwed, and the current sensor B13 is installed on the other grounding bar in the same way, so that the installation of the current sensor A11 and the current sensor B13 is completed, and the wide grounding bars are convenient to adapt; through setting up plugboard mechanism 5, when maintenance or change mainboard, demolish two hexagon socket head cap screw 6 earlier and remove the locking to plugboard mechanism 5, detain shrouding 20 again and take plugboard mechanism 5 out from measuring box 1 along the direction of spout 24, later maintain the mainboard on the board of taking 22, if need the mainboard change, then demolish the mainboard from taking board 22, cooperate mounting hole 23 again to install new mainboard on taking board 22, and be connected to the mainboard according to original position with the inside circuit line of being pulled out of measuring box 1, push plugboard mechanism 5 in measuring box 1 together with the mainboard at last, reinstall two hexagon socket head cap screw 6 can, be convenient for the maintenance and the change of mainboard.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments 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 utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A transformer neutral point direct current magnetic bias current measuring instrument is characterized in that: the temperature-regulating device comprises a measuring box (1) and a temperature-regulating box (2), a screen shaft is installed between the measuring box (1) and the temperature-regulating box (2), a flow-guiding shutter (3) is installed on a front box body penetrating through the temperature-regulating box (2), heat-radiating shutters (4) are installed on two side box bodies penetrating through the measuring box (1) close to the lower end, a plug-in plate mechanism (5) is installed inside the measuring box (1) and below the front box body penetrating through the measuring box (1), hexagon socket head bolts (6) are installed on the front end and the rear end of the plug-in plate mechanism (5) close to the two sides in the middle, four accommodating grooves (7) are formed in one side of the top end of the measuring box (1) close to one side, an embedded computer (14) is installed on the top end of the measuring box (1) close to the other side, a sensor B interface (9) is installed on one side of the top end of the measuring box (1) and behind the sensor B interface (9), and a sensor A interface (8) is installed on the rear end of the sensor B interface (9);
the top end of the measuring box (1) and one side of the sensor A interface (8) and one side of the sensor B interface (9) are provided with the same alarm (15), the top end of the measuring box (1) and one side of the alarm (15) are provided with the temperature sensor (31), the top end of the measuring box (1) and one side of the temperature sensor (31) are provided with the grounding terminal (16), the four accommodating grooves (7) are sequentially provided with the current sensor B (13) and the connecting wire (12) from front to back, the temperature control box comprises a current sensor A (11) and a power line (10), wherein a dust screen (29) is installed on a box body at the back side penetrating through the temperature control box (2), a temperature control module (30) is installed in the temperature control box (2) by leaning against one corner of the bottom end, an electric heating wire (17) is installed on the front side of the dust screen (29), a flow guide fan (18) is installed in the temperature control box (2) in the middle, and a plurality of semiconductor refrigerating pieces (19) are installed on the back side of a fixing frame of the flow guide fan (18).
2. The transformer neutral point direct current bias current measuring instrument according to claim 1, wherein: the flashboard mechanism (5) comprises a sealing plate (20), connecting pieces (21) are installed on two sides of the sealing plate (20) in the middle, a carrying plate (22) is installed on the back of the sealing plate (20) by the lower end, sliding grooves (24) are formed in the two sides of the carrying plate (22) in the middle, nine mounting holes (23) which are arranged in a three-by-three matrix mode are formed in the upper end and the lower end of the carrying plate (22) in a running-through mode, a main board is installed inside the measuring box (1) and located at the upper end of the carrying plate (22), and the main board is connected with the carrying plate (22) in a clamping mode through the mounting holes (23).
3. The instrument for measuring the direct current bias current of the neutral point of the transformer according to claim 1, wherein: the current sensor A (11) comprises two sensing half frames (25) which are symmetrically arranged up and down, frame ears (26) are arranged on two sides of each sensing half frame (25), the upper end and the lower end of each sensing half frame (25) which run through the same side are provided with the same butterfly-shaped fixing bolt (27), the front surface of each sensing half frame (25) which is arranged at the lower end is provided with a connecting port (28) by the lower end in the middle, and the structure of the current sensor B (13) is the same as that of the current sensor A (11).
4. The transformer neutral point direct current bias current measuring instrument according to claim 1, wherein: the utility model discloses a portable electronic thermometer with adjustable temperature, including measuring case (1), measuring case (1) and temperature adjusting box (2), measuring case (1)'s top and the one side that is located ground terminal (16) install electrical socket and switch, run through the top of measuring case (1) and be located embedded computer (14) and accomodate the position between groove (7) and seted up the touch-pen groove, the inside in touch-pen groove is provided with the touch-control pen, computer switch and USB interface are installed by one side to the top surface of embedded computer (14), are the setting that can open and shut between measuring case (1) and temperature adjusting box (2).
5. The transformer neutral point direct current bias current measuring instrument according to claim 1, wherein: the heating wire (17) is the spiral arrangement in the front of dust screen (29), and a plurality of semiconductor refrigeration piece (19) is the spiral arrangement 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 with temperature control module (30) electric connection.
6. The instrument for measuring the direct current bias current of the neutral point of the transformer according to claim 1, wherein: the inserting plate mechanism (5) is connected with the measuring box (1) through a connecting piece (21) matched with an inner hexagon bolt (6), and the inserting plate mechanism (5) is arranged in a drawing mode.
7. The transformer neutral point dc bias current measuring instrument according to any one of claims 1-6, wherein the transformer neutral point dc bias current measuring instrument is used by the following steps:
the method comprises the following steps: when the temperature-controlled electric heating wire is used, firstly, the current measuring instrument is placed at a safe and stable position near a measured grounding bar and is turned on, then the grounding wire is connected with the ground wire through a grounding terminal (16), then a power wire (10) is taken out from a containing groove (7) and is inserted into a power jack and is powered on, then a power switch is turned on, a temperature sensor (31) senses the environment temperature and transmits temperature data to a main board and a temperature control module (30), if the environment temperature is higher than or lower than the highest or lowest allowable use temperature of the current measuring instrument, an alarm (15) gives an alarm, and the temperature control module (30) regulates and controls the electric heating wire (17), a flow guiding fan (18) and a semiconductor refrigerating piece (19) according to the environment temperature and in combination with the allowable use temperature interval of the current measuring instrument, and controls the temperature of the area between the electric heating wire (17) and the semiconductor refrigerating piece (19) to be close to the environment temperature by utilizing the cooperation of the electric heating wire (17) and the semiconductor refrigerating piece (19) The temperature of the air flow is within the use temperature range allowed by the current measuring instrument, the air flow is guided by the flow guide fan (18), the air passes through the dustproof net (29), then passes through the surfaces where the electric heating wire (17) and the semiconductor refrigerating sheet (19) are located, and finally is blown out through the flow guide shutter (3), the window direction of the flow guide shutter (3) is adjusted, the air with the same temperature with the area between the electric heating wire (17) and the semiconductor refrigerating sheet (19) is blown to each component on the measuring box (1), the temperature of each component is adjusted, and the working temperature of each component is not too high or too low, meanwhile, the opening and closing degree of the heat dissipation shutter (4) is adjusted according to the environmental temperature, the opening degree of the heat dissipation shutter (4) is larger when the temperature is higher, and the opening degree of the heat dissipation shutter (4) is smaller when the temperature is lower, so that the heat dissipation or heat preservation in the measuring box (1) is convenient;
step two: taking out the 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 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 grounding bars, wherein the wiring mode of the current sensor B (13) is the same as that of the current sensor A (11), but needs to be connected onto a sensor B interface (9), connecting the current sensor A (11) and the current sensor B (13) with a measuring box (1) after completing the connection of the current sensor A (11) and the current sensor B (13), then connecting the current sensor A (11) and the current sensor B (13) onto the grounding bars, and adopting a method shared by the current sensor A (11) and the current sensor B (13) to unscrew and disassemble two butterfly fixing bolts (27) in the current sensor A (11) when the width between the grounding bars is larger, the locking of frame lugs (26) is released, two sensing half frames (25) are clamped on one of the grounding rows, butterfly fixing bolts (27) are installed again and screwed, and then a current sensor B (13) is installed on the other row in the same way, so that the installation of the current sensor A (11) and the current sensor B (13) is completed;
step three: pressing a computer switch on the embedded computer (14) to start the embedded computer (14), automatically starting acquisition software, displaying a current value on an interface in a digital and waveform mode, storing the value into a database according to a certain interval time, storing the value once by default for five seconds, performing touch control by using a touch pen in a touch pen groove when operating the interface of the embedded computer (14), exiting the software after completing measurement, pressing the computer switch on the embedded computer (14) to shut down, and pressing a power switch to cut off a power supply after the embedded computer (14) is shut down;
step four: when maintenance or change mainboard, demolish two hexagon socket head cap screw (6) earlier and remove the locking to picture peg mechanism (5), detain shrouding (20) again and take out picture peg mechanism (5) from measuring case (1) along the direction of spout (24), later maintain the mainboard on the board of carrying (22), if need the mainboard to be changed, then demolish the mainboard from carrying board (22), cooperate mounting hole (23) again and install new mainboard on carrying board (22), and will measure case (1) inside circuit line of being pulled out and be connected to the mainboard according to original position, push together picture peg mechanism (5) with the mainboard at last in measuring case (1), two hexagon socket head cap screw (6) of reinstallation can.
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| CN202210639422.8A CN114994443A (en) | 2022-06-07 | 2022-06-07 | Transformer neutral point direct current magnetic bias current measuring instrument |
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| CN202210639422.8A CN114994443A (en) | 2022-06-07 | 2022-06-07 | Transformer neutral point direct current magnetic bias current measuring instrument |
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