CN116626456A - External voltage withstand test equipment for power transformer - Google Patents
External voltage withstand test equipment for power transformer Download PDFInfo
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- CN116626456A CN116626456A CN202310906963.7A CN202310906963A CN116626456A CN 116626456 A CN116626456 A CN 116626456A CN 202310906963 A CN202310906963 A CN 202310906963A CN 116626456 A CN116626456 A CN 116626456A
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- 230000005540 biological transmission Effects 0.000 claims description 41
- 230000007246 mechanism Effects 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 244000309464 bull Species 0.000 claims description 5
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses an externally applied withstand voltage test device of a power transformer, which comprises an insulating mounting plate fixedly mounted on a base, wherein three mounting grooves are formed in the insulating mounting plate from top to bottom, an insulating fixing plate is fixedly mounted on the right side wall of each mounting groove, a wire rod is fixedly mounted on each insulating fixing plate, an insulating connecting disc is fixedly mounted at the other end of each wire rod, and a first resistor rod, a second resistor rod and a third resistor rod are sequentially and fixedly mounted between the three insulating fixing plates and the corresponding insulating connecting disc from top to bottom. The advantages are that: the invention can automatically control the variation amplitude of the test voltage in unit time according to the test progress, does not need a worker to manually control the input size of the test voltage, is simpler and more convenient to operate, and the overall rising and reducing amplitude of the test voltage is more in accordance with the voltage variation requirement of an externally applied withstand voltage test, thereby effectively avoiding the problem of damage to the power transformer caused by improper test.
Description
Technical Field
The invention relates to the technical field of voltage transformer withstand voltage tests, in particular to an externally applied withstand voltage test device of a power transformer.
Background
The external voltage withstand test of the power transformer is also called as a power frequency voltage withstand test, and is used for conducting an insulation strength test under a specified voltage on the power transformer, checking the insulation level of a product, finding out insulation defects of a tested product and measuring the overvoltage capacity.
Through retrieving, patent document CN114047418A discloses a voltage withstand test equipment applied externally of power transformer, include the base plate with the support frame of fixed surface connection on the base plate, one side of support frame is connected with the voltage adjustment mechanism that is used for the input voltage change, the opposite side of support frame is connected with the collection mechanism that is used for corresponding different input voltage, voltage adjustment mechanism includes the second mounting disc, second mounting disc fixed connection is on the lateral wall of support frame, the back of support frame is connected with the actuating mechanism that makes second installation axle intermittent type rotate.
The external voltage withstand test equipment of the power transformer has the following defects:
the adjustment of the input voltage is realized by enabling the rotating rod to intermittently rotate in the resistor ring every time, and when in operation, a worker is required to continuously control the working condition of the driving motor, so that the operation is not simple and convenient;
since the test voltage should be uniformly increased at a speed of 3% per second after reaching 40% of the input voltage when the external withstand voltage test is performed, and the voltage should be rapidly and uniformly reduced to less than 25% of the test voltage within 5s after the voltage reaches the prescribed voltage and duration, the external withstand voltage test equipment of the conventional power transformer cannot meet the input of the voltage and the control of the reduction speed, and is liable to damage the power transformer.
Therefore, it is necessary to design an external withstand voltage test apparatus for a power transformer.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an externally applied voltage withstand test device of a power transformer, which solves the problems that the operation is not simple and convenient enough and the externally applied voltage withstand test device of the prior power transformer can not meet the input of voltage and reduce the speed control, and is easy to damage the power transformer.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides an outward applied withstand voltage test equipment of power transformer, includes the insulating mounting panel of fixed mounting on the base, three mounting groove has been seted up from top to bottom in the insulating mounting panel, every the right side wall of mounting groove all fixed mounting has insulating fixed disk, every on the insulating fixed disk all fixed mounting has the wire pole, every the wire pole other end all fixed mounting has insulating connection pad, three fixed mounting has first resistance bar, second resistance bar and third resistance bar from top to bottom in proper order between insulating fixed disk and the corresponding insulating connection pad, every all sliding connection has the slip cap on the wire pole, and every slip cap lower extreme all fixed mounting has the contact bar, every contact bar lower extreme respectively with corresponding first resistance bar, second resistance bar and third resistance bar;
every the equal fixed mounting of rear end of slip cap has insulating side lever, the cavity has been seted up at the back of insulating mounting panel, and cavity and a plurality of mounting groove all intercommunication, the movable groove has been seted up on the lateral wall of cavity, and sliding connection has the movable block in the movable groove, movable block lower extreme fixed mounting has the montant, all install coupling mechanism between montant and the a plurality of insulating side lever, movable inslot internal rotation is connected with the lead screw, and lead screw and movable block threaded connection, the installation cavity has been seted up in the insulating mounting panel, the lead screw is located the one end fixed mounting of installation cavity, the installation intracavity rotates and is connected with the mounting disc, and rotates on the mounting disc and be connected with three bull stick, every equal fixed mounting has connecting gear on the bull stick, one of them connecting gear meshes with fixed gear, install tertiary variable transmission mechanism on the mounting disc, and tertiary variable transmission mechanism cooperatees with three bull stick respectively.
Further, three input line holes are formed in the right side wall of the insulating mounting plate, the three input line holes are communicated with the three mounting grooves respectively, input wires are arranged in the input line holes respectively, the three input wires are fixedly connected with the right sides of the first resistor rod, the second resistor rod and the third resistor rod respectively, output wires are fixedly arranged on the left sides of the first resistor rod, the second resistor rod and the third resistor rod respectively, connecting seats are fixedly arranged at the other ends of the output wires respectively, output wires are fixedly connected to the front ends of the connecting seats respectively, three through holes are formed in the front end side wall of the insulating mounting plate, and each through hole is matched with the corresponding output wire respectively.
Further, a plurality of guide grooves are formed in the wire guide rod, guide blocks are slidably connected in each guide groove, and the guide blocks are fixedly connected with the inner wall of the sliding sleeve.
Further, coupling mechanism comprises slide hole, slide bar, slot, inserted bar, magnetic path and pull block, smooth Kong Kaishe is on the montant, slide bar sliding connection is on the slide hole, the slot is seted up on insulating side lever, inserted bar fixed mounting is on the slide bar, and the inserted bar cooperatees with the slot, magnetic path fixed mounting is inside the slot, and the magnetic path cooperatees with the inserted bar, pull block fixed mounting is on the one end that the slide bar is located outside the montant.
Further, driving motor is fixedly installed on the left side of the insulating mounting plate, driving rods are fixedly installed at the output ends of the driving motor, fixing sleeves are fixedly installed at one ends of the driving rods located in the mounting cavity, and the fixing sleeves are fixedly connected with the mounting plate.
Further, the three-stage variable speed transmission mechanism consists of a first driving gear, a second driving gear, a third driving gear, a driving shaft, an output gear, a first transmission gear, a second transmission gear, a third transmission gear, a servo motor and three rotating shafts, wherein the first driving gear, the second driving gear and the third driving gear are respectively and fixedly arranged at the other ends of the three rotating rods, the servo motor is fixedly arranged in a fixed sleeve, the driving shaft is fixedly arranged on the output of the servo motor, the output gear is fixedly arranged on the driving shaft, the three rotating shafts are respectively and rotatably connected to one end, close to the fixed sleeve, of the mounting disc, the first transmission gear, the second transmission gear and the third transmission gear are respectively and fixedly arranged on the three rotating shafts, the first transmission gear is meshed with the first output gear and the first driving gear, the second transmission gear is meshed with the second output gear and the driving gear, and the third transmission gear is meshed with the third output gear and the third driving gear.
Further, the diameters of the driving gear III, the transmission gear I, the driving gear II, the transmission gear II, the output gear, the driving gear I and the transmission gear III are gradually decreased.
Further, a control panel is fixedly installed on the left side wall of the insulating mounting plate, a set voltage display, an actual voltage display and a controller are fixedly installed on the control panel, three detection signal connecting holes are formed in the control panel, the two detection signal connecting holes are respectively electrically connected with the set voltage display, the actual voltage display and the controller, and the controller is electrically connected with the set voltage display, the actual voltage display, the driving motor and the servo motor.
Compared with the prior art, the invention has the advantages that:
1: through the cooperation of mounting disc, fixed gear, tertiary variable speed mechanism and three connecting gear, can control the variation amplitude of test voltage at unit time according to experimental progress automatically, need not the manual input size of control test voltage of staff, it is simpler and more convenient to operate to the whole rising and the reduction range of test voltage accords with the voltage variation requirement of external application withstand voltage test more, can effectively avoid the problem that leads to power transformer to damage because of the test inappropriateness.
2: through the cooperation of first resistance bar, second resistance bar and third resistance bar, can divide into three interval with the experimental voltage upper and lower limit of input power transformer for this equipment can carry out corresponding outward application withstand voltage test to the power transformer of different models, has improved the application scope of this equipment.
3: through the cooperation of montant, coupling mechanism and three insulating side lever, can drive the contact bar on the corresponding resistance bar when making the lead screw rotate as required and remove, avoid three contact bars to remove simultaneously and lead to the too big problem that causes servo motor overload operation of frictional force.
In summary, the invention can automatically control the variation amplitude of the test voltage in unit time according to the test progress, does not need a worker to manually control the input size of the test voltage, is simpler and more convenient to operate, and the overall rise and the reduction amplitude of the test voltage are more in accordance with the voltage variation requirement of the externally applied withstand voltage test, so that the problem of damage to the power transformer caused by improper test can be effectively avoided.
Drawings
Fig. 1 is a schematic structural diagram of an external voltage withstand test device for a power transformer according to the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the structure of FIG. 1 with the base and insulating mounting plate removed;
FIG. 4 is a schematic view of the back structure of FIG. 1;
FIG. 5 is a schematic view of the structure of FIG. 4 with the base and insulating mounting plate removed;
FIG. 6 is a cross-sectional view of FIG. 5 taken at the midpoint of the vertical rods;
FIG. 7 is an enlarged schematic view of the mounting plate and components thereon of FIG. 6;
FIG. 8 is a schematic view of the structure of the retaining sleeve and components thereon of FIG. 7 removed;
FIG. 9 is an enlarged schematic view of the portion A of FIG. 2;
FIG. 10 is an enlarged schematic view of the portion B of FIG. 6;
fig. 11 is an enlarged schematic view of the structure of the portion C in fig. 5.
In the figure: 1 base, 2 insulating mounting plate, 3 mounting groove, 4 insulating fixing plate, 5 insulating connecting disc, 6 input wire hole, 7 input wire, 8 output wire, 9 connecting seat, 10 output wire, 11 through hole, 12 first resistor rod, 13 second resistor rod, 14 third resistor rod, 15 wire rod, 16 sliding sleeve, 17 contact rod, 18 guide groove, 19 guide block, 20 insulating side rod, 21 moving groove, 22 moving block, 23 lead screw, 24 vertical rod, 25 sliding hole, 26 slide rod, 27 slot, 28 inserting rod, 29 magnetic block, 30 pull block, 31 fixing gear, 32 mounting cavity, 33 driving motor, 34 driving rod, 35 mounting plate, 36 connecting gear, 37 fixing sleeve, 38 driving gear one, 39 driving gear two, 40 driving gear three, 41 driving shaft, 42 output gear, 43 driving gear one, 44 driving gear two, 45 driving gear three, 46 control panel, 47 detecting signal connecting hole, 48 setting voltage display, 49 actual voltage display, 50 controller.
Description of the embodiments
Referring to fig. 1 to 11, an externally applied withstand voltage test device for a power transformer comprises an insulation mounting plate 2 fixedly mounted on a base 1, three mounting grooves 3 are formed in the insulation mounting plate 2 from top to bottom, an insulation fixing plate 4 is fixedly mounted on the right side wall of each mounting groove 3, a wire rod 15 is fixedly mounted on each insulation fixing plate 4, an insulation connecting disc 5 is fixedly mounted on the other end of each wire rod 15, a first resistance rod 12, a second resistance rod 13 and a third resistance rod 14 are sequentially and fixedly mounted between the three insulation fixing plates 4 and the corresponding insulation connecting discs 5 from top to bottom, the diameters of the first resistance rod 12, the second resistance rod 13 and the third resistance rod 14 are sequentially decreased, so that when input voltages are consistent, currents passing through the first resistance rod 12, the second resistance rod 13 and the third resistance rod 14 are sequentially increased, and thus test voltages for the power transformer are sequentially increased, the input voltage can be divided into three sections under the condition that the input voltages are not changed, the external voltage test device can be applied to the device, the first resistance rod 12, the second resistance rod 13 and the third resistance rod 14 are provided with different types of the device, and the externally applied voltage test device can be conveniently applied to the device are described as the device;
three input wire holes 6 are formed in the right side wall of the insulating mounting plate 2, the three input wire holes 6 are communicated with the three mounting grooves 3 respectively, an input wire 7 is mounted in each input wire hole 6, the three input wires 7 are fixedly connected with the right sides of a first resistor rod 12, a second resistor rod 13 and a third resistor rod 14 respectively, input voltages can be introduced into the corresponding resistor rods through the cooperation of the input wires 7 and are transmitted to the corresponding output wires 10 from the corresponding contact rods 17, output wires 8 are fixedly mounted on the left sides of the first resistor rod 12, the second resistor rod 13 and the third resistor rod 14, a connecting seat 9 is fixedly mounted on the other end of each output wire 8, an output wire 10 is fixedly connected to the front end of each connecting seat 9, three through holes 11 are formed in the front side wall of the insulating mounting plate 2, each through hole 11 is matched with the corresponding output wire 10 respectively, the output wire 10 is used for being connected with a power transformer winding, test voltages are input into the corresponding resistor rods, signals are newly connected to the other side of the power transformer, and the voltage is actually required to be input to the power transformer when the power transformer is in a large-level voltage state, and the power transformer is actually required to be subjected to a voltage transformer operation;
the sliding sleeves 16 are slidably connected to each wire rod 15, the lower ends of the sliding sleeves 16 are fixedly provided with contact rods 17, the lower ends of the contact rods 17 are respectively in contact with the corresponding first resistor rod 12, second resistor rod 13 and third resistor rod 14, under the cooperation of the contact rods 17, the voltage of the input resistor rod can be output from the contact positions of the contact rods 17 and the contact positions of the input resistor rod, so that the test voltage output from the resistor rod can be regulated within a corresponding range, the wire rods 15 are provided with a plurality of guide grooves 18, each guide groove 18 is internally and slidably connected with a guide block 19, the guide blocks 19 are fixedly connected with the inner wall of the sliding sleeve 16, and the moving direction of the sliding sleeve 16 on the wire rods 15 can be limited under the cooperation of the guide blocks 19 and the guide grooves 18;
the rear end of each sliding sleeve 16 is fixedly provided with an insulating side rod 20, the back surface of the insulating mounting plate 2 is provided with a cavity, the cavity is communicated with a plurality of mounting grooves 3, the side wall of the cavity is provided with a moving groove 21, a moving block 22 is in sliding connection with the moving groove 21, the lower end of the moving block 22 is fixedly provided with a vertical rod 24, a connecting mechanism is arranged between the vertical rod 24 and the plurality of insulating side rods 20, the moving groove 21 is rotationally connected with a screw rod 23, the screw rod 23 is in threaded connection with the moving block 22, under the action of the connecting mechanism, when an input voltage is connected to one input wire 7, the vertical rod 24 can be connected with the corresponding insulating side rod 20, and at the moment, the corresponding sliding sleeve 16 can be driven to slide on a corresponding resistance rod through the cooperation of the screw rod 23 and the moving block 22, so that the test voltage is controlled;
the connecting mechanism consists of a slide hole 25, a slide bar 26, a slot 27, an inserting rod 28, a magnetic block 29 and a pull block 30, wherein the slide hole 25 is formed in a vertical rod 24, the slide bar 26 is connected to the slide hole 25 in a sliding manner, the slot 27 is formed in an insulating side rod 20, the inserting rod 28 is fixedly arranged on the slide bar 26, the inserting rod 28 is matched with the slot 27, the magnetic block 29 is fixedly arranged in the slot 27, the magnetic block 29 is matched with the inserting rod 28, the pull block 30 is fixedly arranged at one end, outside the vertical rod 24, of the slide bar 26, one end, far away from the slide bar 26, of the inserting rod 28 is made of metal, when the inserting rod 28 is inserted into the slot 27, the connection between the vertical rod 24 and the corresponding insulating side rod 20 can be realized, and the connection stability between the inserting rod 28 and the slot 27 can be ensured under the action of the magnetic block 29;
a mounting cavity 32 is formed in the insulating mounting plate 2, a fixed gear 31 is fixedly mounted at one end of the screw rod 23, which is positioned in the mounting cavity 32, a mounting plate 35 is rotationally connected to one end of the mounting cavity 32, three rotating rods are rotationally connected to the mounting plate 35, a connecting gear 36 is fixedly mounted on each rotating rod, one of the connecting gears 36 is meshed with the fixed gear 31, when one of the rotating rods rotates on the mounting plate 35, the corresponding connecting gear 36 can drive the fixed gear 31 to rotate, so that driving force can be provided for the movement of the vertical rod 24, a driving motor 33 is fixedly mounted at the left side of the insulating mounting plate 2, a driving rod 34 is fixedly mounted at the output end of the driving motor 33, a fixed sleeve 37 is fixedly mounted at one end of the driving rod 34, which is positioned in the mounting cavity 32, and the fixed sleeve 37 is fixedly connected with the mounting plate 35, the driving motor 33 is designed to control the rotation of the mounting plate 35 in the mounting cavity 32, so that the positions of the three connecting gears 36 are changed, and one of the connecting gears 36 is kept meshed with the fixed gear 31;
the mounting plate 35 is provided with a three-stage variable speed transmission mechanism which is respectively matched with three rotating rods, the three-stage variable speed transmission mechanism consists of a first driving gear 38, a second driving gear 39, a third driving gear 40, a driving shaft 41, an output gear 42, a first driving gear 43, a second driving gear 44, a third driving gear 45, a servo motor and three rotating shafts, the first driving gear 38, the second driving gear 39 and the third driving gear 40 are respectively and fixedly arranged at the other ends of the three rotating rods, the servo motor is fixedly arranged in the fixed sleeve 37, the driving shaft 41 is fixedly arranged on the output of the servo motor, the output gear 42 is fixedly arranged on the driving shaft 41, the three rotating shafts are all rotationally connected to one end of the mounting plate 35 close to the fixed sleeve 37, the first driving gear 43, the second driving gear 44 and the third driving gear 45 are respectively and fixedly arranged on the three rotating shafts, the first transmission gear 43 is meshed with the output gear 42 and the first driving gear 38, the second transmission gear 44 is meshed with the output gear 42 and the second driving gear 39, the third transmission gear 45 is meshed with the output gear 42 and the third driving gear 40, the output power of the servo motor is a fixed value, when the servo motor works, the first transmission gear 43, the second transmission gear 44 and the third transmission gear 45 can be driven by the output gear 42 to rotate, then under the corresponding coordination of the first transmission gear 43, the second transmission gear 44 and the third transmission gear 45, the first driving gear 38, the second driving gear 39 and the third driving gear 40, the three rotating rods can rotate at different speeds, at the moment, when the three connecting gears 36 are respectively contacted with the fixed gears 31, the rotating speed of the screw rod 23 can also be changed, so that the moving speed of the vertical rod 24 can be controlled, the moving speed of the contact rod 17 on the resistance rod can be changed along with the moving speed, and the rising or reducing of the test voltage in unit time can be changed at the moment, so that the control of the test voltage change amplitude in different test time periods can be met conveniently;
the diameters of the driving gear III 40, the driving gear I43, the driving gear II 39, the driving gear II 44, the output gear 42, the driving gear I38 and the driving gear III 45 decrease in sequence, as can be seen from the dimensional design and fig. 8, when the output gear 42 rotates, the rotating speed of the connecting gear 36 corresponding to the position of the driving gear III 40 is slowest, the rotating speed of the connecting gear 36 corresponding to the position of the driving gear II 39 is in a state of no speed, the rotating speed of the connecting gear 36 corresponding to the position of the driving gear I38 is fastest, therefore, in the actual test, the connecting gear 36 corresponding to the position of the driving gear II 39 can be firstly contacted with the fixed gear 31, the test voltage steadily reaches 40% of the input voltage, then the connecting gear 36 corresponding to the position of the driving gear III 40 is rotated again, the test voltage is increased to the specified voltage at a speed of 3% per second from the 40%, at this time, the servo motor stops running and the test voltage is kept for a certain time, the connecting gear 36 corresponding to the position of the driving gear I38 is rotated again, the connecting gear 36 and the connecting gear 31 corresponding to the position of the driving gear I38 is contacted with the connecting gear 31, the connecting gear 31 and the connecting gear 31 to the connecting gear 31, the connecting gear 31 to the connecting gear and the connecting gear to the test voltage, the connecting gear to the right side is rotated fast, the test bar is rotated fast, and the test bar is then the test bar is rotated fast, and the test bar is turned down;
the left side wall of the insulating mounting plate 2 is fixedly provided with a control panel 46, the control panel 46 is fixedly provided with a set voltage display 48, an actual voltage display 49 and a controller 50, the control panel 46 is provided with three detection signal connection holes 47, the two detection signal connection holes 47 are respectively electrically connected with the set voltage display 48, the actual voltage display 49 and the controller 50, the controller 50 is electrically connected with the set voltage display 48, the actual voltage display 49, the driving motor 33 and the servo motor, the set voltage display 48 is used for detecting and displaying set voltage, the actual voltage display 49 is used for displaying and detecting test voltage, and the controller 50 is used for receiving voltage detection signals of the set voltage display 48 and the actual voltage display 49 and controlling the driving motor 33 and the working condition of the servo motor according to voltage.
In the invention, the connecting gear 36 corresponding to the position of the second driving gear 39 is contacted with the fixed gear 31 through the driving motor 33, then the vertical rod 24 is connected with the plurality of insulating side rods 20 through the connecting mechanism, the servo motor is opened to enable the plurality of sliding sleeves 16 to move to the rightmost side (as shown in fig. 2) on the plurality of resistance rods, at the moment, the resistance of the resistance rods is minimum, the voltage passing through the resistance rods is also minimum, then the input voltage is connected to the input lead 7 on the corresponding resistance rod according to the model of the power transformer, then the corresponding output line 10 is connected to the winding of the power transformer, meanwhile, the signal line is connected between the other side of the power transformer and the three detection signal connecting holes 47, the actual voltage is transmitted to the control panel 46, and the power transformer is grounded;
the input voltage is turned on, the device is electrified, the controller 50 is turned on, at this time, according to the detection data of the actual voltage display 49, the driving motor 33 stops running, the servo motor rotates forward to drive the contact rod 17 to move on the resistance rod at any speed, the test voltage is increased gradually, when the test voltage is increased to 40% of the input voltage, the servo motor stops running, the driving motor 33 works to enable the connecting gear 36 corresponding to the position of the driving gear three 40 to be in contact with the fixed gear 31, at this time, the servo motor continues to continuously transfer the test voltage to be increased to the specified voltage from 40% of the input voltage at a speed of 3% per second, then the servo motor stops running to keep the test voltage at the specified voltage for a certain time, after the test is completed, the driving motor 33 drives the mounting plate 35 to rotate again according to the instruction of the controller 50 to enable the connecting gear 36 corresponding to the first 38 position of the driving gear to be in contact with the fixed gear 31, and enables the servo motor to reversely rotate, so that the vertical rod 24 can quickly drive the contact rod 17 to move to the rightmost side of the resistance rod, the test voltage is quickly reduced, then the power supply is cut off, the whole operation is simpler and more convenient, the manual control of the input size of the test voltage by a worker is not needed, the integral rising and reducing amplitude of the test voltage are more in accordance with the voltage change requirement of the externally applied withstand voltage test, and the problem that the power transformer is damaged due to improper test can be effectively avoided.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides an outward applied withstand voltage test equipment of power transformer, includes insulating mounting panel (2) of fixed mounting on base (1), its characterized in that, three mounting groove (3) have been seted up from top to bottom in insulating mounting panel (2), every the right side wall of mounting groove (3) all fixed mounting has insulating fixed disk (4), every on insulating fixed disk (4) all fixed mounting wire pole (15), every wire pole (15) other end all fixed mounting has insulating connection pad (5), and is three between insulating fixed disk (4) and the insulating connection pad (5) that correspond is fixed mounting in proper order from top to bottom has first resistance bar (12), second resistance bar (13) and third resistance bar (14), every all sliding connection has sliding sleeve (16) on wire pole (15), and every sliding sleeve (16) lower extreme all fixed mounting contact bar (17), every contact bar (17) lower extreme respectively with corresponding first resistance bar (12), second resistance bar (13) and third resistance bar (14);
every the equal fixed mounting in rear end of slip cap (16) has insulating side lever (20), cavity has been seted up at the back of insulating mounting panel (2), and cavity and a plurality of mounting groove (3) all intercommunication, moving groove (21) have been seted up on the lateral wall of cavity, and sliding connection has movable block (22) in moving groove (21), movable block (22) lower extreme fixed mounting has montant (24), all install coupling mechanism between montant (24) and a plurality of insulating side lever (20), movable groove (21) internal rotation is connected with lead screw (23), and lead screw (23) and movable block (22) threaded connection, install installation cavity (32) in insulating mounting panel (2), one end fixed mounting that lead screw (23) are located installation cavity (32) has fixed gear (31), install mounting cavity (32) internal rotation and be connected with mounting disc (35), and rotate on mounting disc (35) and be connected with three bull stick, every all fixed mounting has coupling gear (36) on the bull stick, one of them coupling gear (36) and three-stage transmission mechanism are installed on the three-stage transmission respectively.
2. The external voltage withstand test device for the power transformer according to claim 1, wherein three input wire holes (6) are formed in the right side wall of the insulating mounting plate (2), the three input wire holes (6) are respectively communicated with the three mounting grooves (3), an input wire (7) is respectively mounted in each input wire hole (6), the three input wires (7) are respectively fixedly connected with the right sides of the first resistor rod (12), the second resistor rod (13) and the third resistor rod (14), an output wire (8) is fixedly mounted on the left sides of the first resistor rod (12), the second resistor rod (13) and the third resistor rod (14), an output wire (10) is fixedly mounted on the other end of each output wire (8), three through holes (11) are formed in the front side wall of the insulating mounting plate (2), and each through hole (11) is respectively matched with the corresponding output wire (10).
3. The external voltage withstand test device for the power transformer according to claim 1, wherein a plurality of guide grooves (18) are formed in the wire guide rod (15), guide blocks (19) are slidably connected in each guide groove (18), and the guide blocks (19) are fixedly connected with the inner wall of the sliding sleeve (16).
4. The external voltage withstand test device for the power transformer according to claim 1, wherein the connecting mechanism is composed of a sliding hole (25), a sliding rod (26), a slot (27), an inserting rod (28), a magnetic block (29) and a pull block (30), the sliding hole (25) is formed in a vertical rod (24), the sliding rod (26) is slidably connected to the sliding hole (25), the slot (27) is formed in an insulating side rod (20), the inserting rod (28) is fixedly mounted on the sliding rod (26), the inserting rod (28) is matched with the slot (27), the magnetic block (29) is fixedly mounted in the slot (27), the magnetic block (29) is matched with the inserting rod (28), and the pull block (30) is fixedly mounted at one end, located outside the vertical rod (24), of the sliding rod (26).
5. The external voltage withstand test device for the power transformer according to claim 1, wherein a driving motor (33) is fixedly arranged on the left side of the insulating mounting plate (2), a driving rod (34) is fixedly arranged at the output end of the driving motor (33), a fixing sleeve (37) is fixedly arranged at one end of the driving rod (34) positioned in the mounting cavity (32), and the fixing sleeve (37) is fixedly connected with the mounting plate (35).
6. The external pressure test device for a power transformer according to claim 5, wherein the three-stage variable speed transmission mechanism comprises a first driving gear (38), a second driving gear (39), a third driving gear (40), a driving shaft (41), an output gear (42), a first transmission gear (43), a second transmission gear (44), a third transmission gear (45), a servo motor and three rotating shafts, wherein the first driving gear (38), the second driving gear (39) and the third driving gear (40) are respectively and fixedly arranged at the other ends of the three rotating rods, the servo motor is fixedly arranged in a fixed sleeve (37), the driving shaft (41) is fixedly arranged on the output of the servo motor, the output gear (42) is fixedly arranged on the driving shaft (41), the three rotating shafts are respectively and rotatably connected to one end of the mounting disc (35) close to the fixed sleeve (37), the first transmission gear (43), the second transmission gear (44) and the third transmission gear (45) are respectively and fixedly arranged on the three rotating shafts, the first transmission gear (43) is meshed with the first output gear (42) and the second driving gear (38) and the second transmission gear (42) are meshed with the output gear (42), the third transmission gear (45) is meshed with the third output gear (42) and the third driving gear (40).
7. The device for testing the withstand voltage of the power transformer according to claim 6, wherein the diameters of the driving gear III (40), the transmission gear I (43), the driving gear II (39), the transmission gear II (44), the output gear (42), the driving gear I (38) and the transmission gear III (45) are sequentially decreased.
8. The external voltage withstand test device for the power transformer according to claim 6, wherein a control panel (46) is fixedly installed on the left side wall of the insulating installation plate (2), a set voltage display (48), an actual voltage display (49) and a controller (50) are fixedly installed on the control panel (46), three detection signal connection holes (47) are formed in the control panel (46), the two detection signal connection holes (47) are respectively electrically connected with the set voltage display (48), the actual voltage display (49) and the controller (50), and the controller (50) is electrically connected with the set voltage display (48), the actual voltage display (49), the driving motor (33) and the servo motor.
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| CN202310906963.7A CN116626456B (en) | 2023-07-24 | 2023-07-24 | External voltage withstand test equipment for power transformer |
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| CN202310906963.7A CN116626456B (en) | 2023-07-24 | 2023-07-24 | External voltage withstand test equipment for power transformer |
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