An automatic electrical connection complete set of devices for voltage transformer tests

Abstract

The present invention discloses a complete set of automatic electrical connection devices for voltage transformer tests, including an automatic electrical connection device for transformer error tests, an automatic electrical connection device for transformer insulation resistance tests, and an automatic electrical connection device for transformer withstand voltage / partial discharge tests; the automatic electrical connection device for transformer error tests includes: an automatic crimping device for primary terminals of the transformer and an automatic crimping device for secondary terminals of the transformer. The automatic crimping device for primary terminals is used for the automatic electrical connection between the primary terminals of the transformer under test and the electrical device, and the automatic crimping device for secondary terminals is used for the automatic electrical connection between the secondary terminals of the transformer under test and the electrical device. The automatic electrical connection device for transformer error tests provided by the present invention is a standardized automatic device for transformer tests, which can be applied to the relevant tests of 2 sets of transformers in a group. Through combination and electrical series / parallel connection, the insulation resistance test and withstand voltage test of multiple sets of transformers in a group can also be realized, greatly enhancing the universality of the automatic electrical connection device.

Description

Technical Field

[0001] The present invention discloses a complete set of automatic electrical connection devices for voltage transformer tests, which relates to the field of automatic detection of power transformer products. Background Art

[0002] At present, the product detection assembly lines of power transformer manufacturing enterprises all adopt manual operation modes, with high labor costs, high labor intensity, low efficiency, and high personal safety risks. Therefore, it is very necessary to achieve unmanned automation of the product detection assembly line. And the automation of electrical connection in transformer electrical tests is an essential technical means for the automated assembly line. Although there are similar automatic crimping devices currently, they are only suitable for the detection of non-standard transformers, with complex structures, and can only achieve the wiring of a single transformer at a time. Generally, they are only applicable to the single-item test of transformer errors, with great limitations. There is no automatic crimping device suitable for a series of safety preventive tests such as partial discharge, power frequency withstand voltage, induced withstand voltage, and insulation resistance test of transformers, nor is there relevant equipment suitable for the fixed product factory inspection scenario of transformer manufacturing enterprises. There is a need for an automatic crimping device suitable for the detection of fixed-type multi-series standard transformers, which is very necessary for transformer manufacturing enterprises. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that during the product detection process of power transformer manufacturing enterprises, similar devices in the prior art are generally suitable for the detection of non-standard transformers, can only achieve the electrical connection of a single transformer at a time, are only applicable to the single-item test of transformer errors, with great limitations, and the detection efficiency of transformers is low.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: a complete set of automatic electrical connection devices for voltage transformer tests, including at least one set of complete sets of automatic electrical connection devices for transformer error tests; the complete set of automatic electrical connection devices for transformer error tests includes a primary terminal automatic crimping device and a secondary terminal automatic crimping device; the primary terminal automatic crimping device is used for the automatic electrical connection between the primary terminal of the transformer to be tested and the electrical device, and the secondary terminal automatic crimping device is used for the automatic electrical connection between the secondary terminal of the transformer to be tested and the electrical device; the crimping head of the secondary terminal automatic crimping device is a piano-key type electric claw; the primary terminal automatic crimping device includes a first crimping cylinder, the lower side of the first crimping cylinder is connected to the upper side of a horizontal movement positioning mechanism, and the lower side of the horizontal movement positioning mechanism is connected to two groups of primary terminal electrical connection components. Each group of electrical connection components includes 2 crimping heads, and the two groups form a 2x2 contact electrical contact mechanism for the automatic electrical connection of 2 voltage transformer tests.

[0005] The aforementioned automatic electric connection complete set device for voltage transformer tests. The horizontal movement positioning mechanism includes a support frame. The bottom of the support frame is connected to two parallel guide rail mounting plates. The guide rail mounting plates are connected to guide rails. Two slide plates are connected between the guide rails through sliders. A primary terminal electric connection component is connected to the bottom of each slide plate and moves towards or away from each other through the drive of an electric cylinder. The front and rear ends of the support frame are respectively connected to an electric cylinder mounting plate and an electric cylinder. The electric cylinder push rod connecting piece is of an L-shaped structure and is respectively connected to the electric cylinder push rod and the slide plate. A magnetic induction sheet is arranged at the end of each slide plate close to the sensor side, and cooperates with the magnetic induction sensor to output an electric cylinder braking signal to the PLC. The magnetic induction sensors are arranged on the left and right sides of the support frame. The primary terminal electric connection components are in two groups. The first insulator of each group of primary terminal electric connection components is arranged vertically. Its upper end is connected to the slide plate through a first shaft seat, and its lower end is connected to a crimping plate. Guide seats are connected in the shaft holes at both ends of the crimping plate. The crimping copper column passes through the hole in the middle of the guide seat. A spring is sleeved upwards from below the crimping copper column, and the inner seat of the crimping head is screwed into the external thread at the lower end of the crimping copper column.

[0006] The aforementioned automatic electric connection complete set device for voltage transformer tests. The secondary terminal automatic crimping device includes: a mounting bracket, a second crimping cylinder, and a secondary terminal electric connection component. The second crimping cylinder is connected to the mounting bracket, and the second crimping cylinder is connected to the secondary terminal electric connection component. The structure of the secondary terminal electric connection component includes an insulating mounting plate. Four sets of electric claws are symmetrically connected below the insulating mounting plate, and a grounding rod is symmetrically arranged in the middle. Each set of four sets of electric claws can simultaneously crimp a terminal of a double-secondary-winding type transformer. Two sets of four sets of electric claws can crimp the terminals of two double-secondary-winding type transformers. Each set of four sets of electric claws includes an insulating bottom plate. The two ends of the insulating bottom plate are connected to the insulating mounting plate through T-shaped connecting frames. A shaft is connected between the T-shaped connecting frames. Four second insulating sleeves are sleeved on the shaft. A piano-key type copper row is sleeved on each second insulating sleeve. Second insulating sleeves are arranged between the piano-key type copper row and the T-shaped connecting frame and between adjacent piano-key type copper rows. The piano-key type copper row is connected to the insulating mounting plate through a second spring. The grounding rod includes a third spring. The third spring is sleeved on the grounding copper rod, and the upper end of the grounding copper rod is connected to the insulating mounting plate.

[0007] The aforementioned automatic electrical connection complete set for voltage transformer tests includes two sets of automatic electrical connection devices for transformer error tests, forming a 4-position automatic electrical connection complete set for transformer insulation resistance tests: The isobaric pressure plates of the primary terminal automatic crimping devices of the two sets of automatic electrical connection devices for transformer error tests are connected in series through wires and then connected in equipotential parallel to form an electrical short circuit, and are connected to the high-voltage terminal of the insulation resistance tester through wires; The 4-position electric claws of the secondary terminal automatic crimping devices of the two sets of automatic electrical connection devices for transformer error tests are connected to the input end of the test circuit control switch through wires, and the output end of the test circuit control switch is connected to the low-voltage terminal of the insulation resistance tester.

[0008] The aforementioned automatic electrical connection complete set for voltage transformer tests is characterized by further comprising: a high-voltage switching device, which together with two sets of automatic electrical connection devices for transformer error tests forms a 4-position (4 units) automatic electrical connection complete set for transformer withstand voltage / partial discharge tests:

[0009] The isobaric pressure plates of the primary terminal automatic crimping devices of the two sets of automatic electrical connection devices for transformer error tests are connected in series through wires to form an equipotential; The two series connections form two different equipotential ends, which are then respectively connected to the corresponding switching copper bars of the A-pole electric contact automatic crimping mechanism and the B-pole electric contact automatic crimping mechanism of the high-voltage switching device through wires; The 4-position electric claws of the secondary terminal automatic crimping devices of the two sets of automatic electrical connection devices for transformer error tests are connected to the input end of the test circuit control switch through wires.

[0010] The aforementioned automatic electrical connection complete set device for voltage transformer tests, wherein the high-voltage switching device includes: an automatic crimping mechanism for A-pole electrical contacts and an automatic crimping mechanism for B-pole electrical contacts. The switching copper bars of the automatic crimping mechanism for A-pole electrical contacts and the automatic crimping mechanism for B-pole electrical contacts are respectively crimped to the crimping plates of the primary-end electrical connection components of the primary terminal automatic crimping device through wires; the automatic crimping mechanism for A-pole electrical contacts, the automatic crimping mechanism for B-pole electrical contacts, the high-voltage electrode busbar assembly, the A-pole floor assembly, and the B-pole floor assembly are all connected to the mounting frame; both the automatic crimping mechanism for A-pole electrical contacts and the automatic crimping mechanism for B-pole electrical contacts include a third crimping cylinder. The upper end of the third crimping cylinder is connected to the mounting frame through its mounting support, and the lower end is sequentially connected to a second shaft seat and a second insulator through an adapter plate; the high-voltage copper column is sleeved into the inner hole above the switching copper bar. There is a protruding step on the high-voltage copper column so that it is placed above the switching copper bar. The fourth spring is sleeved onto the high-voltage copper column, and the fourth spring and the copper column are sleeved into the hole at the lower end of the second insulator. The copper column nut is screwed into the external thread at the upper part of the high-voltage copper column to fix the switching copper bar to the second insulator, so that the fourth spring is compressed into an elastic state inside the second insulator; both the A-pole floor assembly and the B-pole floor assembly include a third insulator. The third insulator is connected to the mounting frame through an adapter plate. The lower end of the third insulator is connected to a grounding copper bar, and the grounding copper bar is connected to a grounding copper column. A fifth spring is arranged between the grounding copper bar and the grounding copper column; the high-voltage electrode busbar assembly includes three fourth insulators and a high-voltage busbar. The upper end of each fourth insulator is connected to the mounting frame, and the lower end is connected to the high-voltage busbar.

[0011] The beneficial effects achieved by the present invention: The automatic electrical connection complete set device for voltage transformer tests provided by the present invention, wherein the error test automatic electrical connection device can simultaneously realize the automatic electrical connection of 2 transformers through a 4-contact electrical contact mechanism.

[0012] The present invention is not only applicable to error tests but also applicable to the volt-ampere characteristics and turn-to-turn insulation tests of 2 grouped transformers. Through combination and electrical series / parallel connection, the insulation resistance tests and withstand voltage tests of multiple (multiples of 2) grouped transformers can also be realized, greatly improving the automation detection efficiency, simplifying the automation equipment for transformer tests, and enhancing the universality of the automatic electrical connection device.

[0013] The key-type electric claws of the secondary terminal automatic crimping device provided by the present invention solve the problem of the unsafe discharge phenomenon caused by the too small electrical clearance between the upper part of the high-voltage test pole-type crimping head and the primary high-voltage terminal: Through the key-type copper bar, finger-type pressing connection is realized, thereby reducing the distance between the contact and the high-voltage terminal, that is, increasing the test electrical clearance, so as to avoid the high-voltage test sparking phenomenon; in addition, the key-type electric claw pressing method can make the electrical contact more flexible and reliable, and improve the service life of the equipment.

[0014] The high-voltage switching device provided by the present invention, in cooperation with the withstand voltage / partial discharge test automatic electrical connection device, synchronously completes the power frequency withstand voltage, induced withstand voltage, and partial discharge tests of the mutual inductor, enhancing the function of the mutual inductor automatic detection production line. Brief Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the complete set of automatic electrical connection devices for the error test of the mutual inductor of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of the automatic crimping device for the primary terminal;

[0017] Figure 3 It is an exploded view of the horizontal movement positioning mechanism of the automatic crimping device for the primary terminal;

[0018] Figure 4 It is an exploded view of the primary terminal electrical connection assembly of the automatic crimping device for the primary terminal;

[0019] Figure 5 It is a schematic diagram of the structure of the automatic crimping device for the secondary terminal;

[0020] Figure 6 It is an exploded view of the secondary terminal electrical connection assembly of the automatic crimping device for the secondary terminal;

[0021] Figure 7 It is a schematic diagram of the complete set of automatic electrical connection devices for the insulation resistance test;

[0022] Figure 8 It is a schematic diagram of the complete set of automatic electrical connection devices for the withstand voltage / partial discharge test of the mutual inductor;

[0023] Figure 9 It is a schematic diagram of the high-voltage switching device of the complete set of automatic electrical connection devices for the withstand voltage / partial discharge test of the mutual inductor. Embodiment

[0024] The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention. Example

[0025] As Figure 1 One example provided: This embodiment provides a complete set of automatic electrical connection devices for the voltage transformer test, including: at least one automatic electrical connection device for the error test of the mutual inductor. The automatic electrical connection device for the error test of the mutual inductor includes: an automatic crimping device 1 for the primary terminal and an automatic crimping device 2 for the secondary terminal. When this embodiment is implemented, the automatic crimping device 1 for the primary terminal can be fixed above the corresponding workbench 3, and the secondary automatic crimping device 2 can be fixed on the side of the corresponding workbench 3. A fixed working position is formed on the workbench 3 to place the mutual inductor 4 to be tested, and the workbench 3 is not limited toFigure 1 Roller conveyor mechanism in.

[0026] like Figure 2 As shown: the primary terminal automatic crimping device 1 includes: a first crimping cylinder 11, a horizontal moving positioning mechanism 12 and a primary end electrical connection component 13, the lower side of the first crimping cylinder 11 is connected to the upper side of the horizontal moving positioning mechanism 12, the lower side of the horizontal moving positioning mechanism 12 is connected to the primary end electrical connection component 13, and the primary end electrical connection component 13 is driven by the electric cylinder to move toward or away from each other; the primary end electrical connection component 13 is a 2х2 contact electrical contact mechanism, and the 4-point electrical contact mechanism can crimp 2 transformers to be tested at the same time.

[0027] like Figure 3 As shown: the horizontal movement positioning mechanism 12 includes: a support frame 121, a guide rail 122 and a slide plate 123, a guide rail mounting plate 124, a slider 125, an electric cylinder mounting plate 126, an electric cylinder 127, a push rod connecting piece 128 of the electric cylinder 127, and a magnetic induction sensor 129; two parallel guide rail mounting plates 124 are connected to the bottom of the support frame 121, the guide rail mounting plate 124 is connected to the guide rail 122, two slide plates 123 are connected between the guide rails 122 through a slider 125, and each slide plate 123 is connected to a primary end electrical connection component 13; the front and rear ends of the support frame 121 are respectively connected to the electric cylinder mounting plates 126, each of the electric cylinder mounting plates 126 is connected to the electric cylinder 127, and its push rod connecting piece 128 is L-shaped, which respectively connects the push rod of the electric cylinder 127 and the slide plate 123;

[0028] The magnetic induction sensor 129 is installed on the support frame 121 and is numbered and positioned according to the model of the transformer being tested; the sensor sensing piece is installed on the slide plate 123 close to the support frame 121 and close to the position of the sensor 129. When the sensing piece moves to the position of the magnetic induction sensor, the PLC controller brakes the electric cylinder after receiving the corresponding signal and starts the first crimping cylinder 11 to start pressing down.

[0029] like Figure 4 As shown: each group of the primary-end electrical connection assembly 13 includes: a first shaft seat 131, a first insulator 132, a crimping copper column 133, a crimping plate 134, a guide seat 135, a first spring 137 and a threaded crimping joint 136: two first insulators 132 are vertically arranged, and their upper ends are connected to the first shaft seat 131, and their lower ends are connected to the crimping plate 134, the crimping plates 134 are arranged in parallel, and the axial holes at both ends of the crimping plates 134 are connected to the guide seat 135, the crimping copper column 133 passes through the hole in the middle of the guide seat 135, and the spring is inserted upward from the bottom of the crimping copper column 133, and is screwed into the lower end external thread of the crimping copper column 133 through the inner seat thread of the crimping joint 136.

[0030] like Figure 5As shown in the figure: The secondary terminal automatic crimping device 2 includes: a mounting bracket 21, a second crimping cylinder 22, and a secondary terminal electrical connection assembly 23; the second crimping cylinder 22 is connected to the mounting bracket 21, and the secondary terminal electrical connection assembly 23 is connected to the second crimping cylinder 22.

[0031] As Figure 6 shown in the figure: The secondary terminal electrical connection assembly 23 includes: an insulating mounting plate 231, two sets of 4-position electric claws 232, and a grounding rod 233; two sets of 4-position electric claws 232 are symmetrically connected under the insulating mounting plate 231, and the grounding rod 233 is symmetrically arranged between the two sets of 4-position electric claws 232;

[0032] The 4-position electric claws 232 can simultaneously crimp the terminals of a double-secondary-winding type transformer 4 (2 terminals for each winding, a total of 4 crimping heads 136), and the two sets of 4-position electric claws can crimp the terminals of 2 double-secondary-winding type transformers 4 (2×4 heads); the 4-position electric claws 232 include: a T-shaped connecting frame 2321, a shaft 2322, a second spring 2323, a piano-key type copper bar 2324, a first insulating sleeve 2325, a second insulating sleeve 2326, and an insulating bottom plate 2327; both ends of the insulating bottom plate 2327 are connected to the mounting insulating crimping plate 231 through the T-shaped connecting frame 2321, the shaft 2322 is connected between the T-shaped connecting frames 2321, 4 first insulating sleeves 2325 are sleeved on the shaft 2322, a piano-key type copper bar 2324 is sleeved on each first insulating sleeve 2325, second insulating sleeves 2326 are arranged between the piano-key type copper bar 2324 and the T-shaped connecting frame 2321 and between adjacent finger-type wiring bars 2324, and the piano-key type copper bar 2324 is connected to the insulating mounting plate 231 through the second spring 2323;

[0033] The grounding rod 233 includes: a third spring 2331 and a grounding copper bar 2332; the third spring 2331 is sleeved into the grounding copper bar 2332, and the upper end of the grounding copper bar 2332 is connected to the insulating mounting plate 231.

[0034] Based on Figure 1Error test electrical connection process of the embodiment: A set of automatic electrical connection complete sets of devices for transformer error testing simultaneously performs error testing on 2 transformers. The primary terminal automatic crimping device 1 of the complete set of devices drives the primary terminal electrical connection component 13 through the first crimping cylinder 11 to crimp with the corresponding primary terminals of the two transformers, connecting to both poles of the transformer. The crimping plate 134 of the primary terminal electrical connection component is connected to the error test power supply circuit through a wire, thus completing the automatic electrical connection of the primary circuit. The secondary automatic crimping device 2 of the complete set of devices drives the secondary terminal electrical connection component 23 through the second crimping cylinder 22 to crimp with the secondary terminals of the corresponding two transformers, and the electric claw 232 is connected to the error tester through a wire, thus completing the automatic electrical connection of the secondary test circuit and realizing the synchronous error test of 2 transformers.

[0035] As Figure 7 shown, there are two sets of automatic electrical connection devices for transformer error testing, which form a complete set of automatic electrical connection devices for transformer insulation resistance testing. The equal-potential crimping plates between the primary terminal automatic crimping devices of the two sets of automatic electrical connection devices for transformer error testing are connected in series through a wire, and then are connected in parallel for equal-potential to form an electrical short circuit, and are connected to the high-voltage end of the insulation resistance tester through a wire. The electric claws of the secondary terminal automatic crimping devices 2 of the two sets of automatic electrical connection devices for transformer error testing are connected to the input end of the test circuit control switch through a connecting wire, and the output end of the test circuit control switch is connected to the low-voltage end of the insulation resistance tester. The complete set of devices can simultaneously realize the electrical connection for the insulation resistance testing of 4 transformers, improve the corresponding test efficiency, and eliminate the bottleneck phenomenon of the production line.

[0036] Based on Figure 7 the insulation resistance test electrical connection process: The crimping head 136 of the primary terminal electrical connection component 13 of the two sets of automatic electrical connection devices for transformer error testing is driven to press down through the first crimping cylinder 11 to achieve equal-potential electrical connection with the primary terminals of 4 transformers. The crimping plate 134 of the primary terminal electrical connection component 13 is connected to the high-voltage end of the insulation resistance test device through a wire. The ground copper bar crimped by the secondary automatic crimping device of the two sets of automatic electrical connection devices for transformer error testing is driven to press down through the second cylinder 22 to make the electric claw 232 achieve electrical connection with the secondary terminals of the transformers. The electric claw is connected to the input end of the test circuit control switch (short-circuiting the secondary terminals of the transformers) through a connecting wire, and the output end of the test circuit control switch is connected to the low-voltage end of the insulation resistance test device. Embodiment

[0037] Figures 8 - 9 Two sets of automatic electrical connection devices for transformer error testing and a high-voltage switching device form a complete set of automatic electrical connection devices for transformer withstand voltage / partial discharge testing:

[0038] The equal potential is formed by connecting the isopotential crimping plates of the primary terminal automatic crimping device 1 of the two sets of transformer error test automatic electrical connection devices in series through wires; the two sets are connected in series to form two different equal potential terminals, and then they are respectively connected to the switching copper bars of the A-pole electrical contact automatic crimping mechanism Z1 and the B-pole electrical contact automatic crimping mechanism Z2 of the high-voltage switching device Z through wires; the 4-group electrical claws of the secondary terminal automatic crimping device 2 of the two sets of transformer error test automatic electrical connection devices are connected to the input end of the test circuit control switch through connecting wires.

[0039] The high-voltage switching device Z includes: an A-pole electrical contact automatic crimping mechanism Z1, a B-pole electrical contact automatic crimping mechanism Z2, a high-voltage electrode busbar assembly Z3, an A-pole floor assembly Z4, a B-pole floor assembly Z5, and a mounting frame Z6; the switching copper bars of the A-pole electrical contact automatic crimping mechanism Z1 and the B-pole electrical contact automatic crimping mechanism Z2 are respectively connected to the crimping plates 134 of the primary crimping assemblies of the two primary terminal automatic crimping devices 13 through wires;

[0040] The A-pole electrical contact automatic crimping mechanism Z1, the B-pole electrical contact automatic crimping mechanism Z2, the high-voltage electrode busbar assembly Z3, the A-pole floor assembly Z4, and the B-pole floor assembly Z5 are all connected to the mounting frame Z6;

[0041] Both the A-pole electrical contact automatic crimping mechanism Z1 and the B-pole electrical contact automatic crimping mechanism Z2 include: a third crimping cylinder mounting support Z11, a third crimping cylinder Z12, a cylinder adapter plate Z13, a second shaft seat Z14, a second insulator Z15, a fourth spring Z16, a switching copper bar Z17, a high-voltage copper column Z18, and a copper column nut Z19;

[0042] The upper end of the third crimping cylinder Z12 is connected to the mounting frame Z6 through the third crimping cylinder mounting support Z11, and the lower end is sequentially connected to the second shaft seat Z14 and the second insulator Z15 through the cylinder adapter plate Z13. The high-voltage copper column Z18 is sleeved into the inner hole above the switching copper bar Z17. There is a convex step on the high-voltage copper column Z18 so that the copper column is placed above the current-transferring connection copper bar. The fourth spring Z16 is sleeved onto the high-voltage copper column Z18, and the fourth spring Z16 and the copper column Z18 are sleeved into the hole at the lower end of the second insulator Z15. The copper column nut Z19 is screwed into the upper external thread of the high-voltage copper column Z18 to fix the switching copper bar Z17 to the second insulator Z15, so that the fourth spring Z16 is compressed into an elastic state inside the second insulator Z15;

[0043] Both the A-pole floor assembly Z4 and the B-pole floor assembly Z5 include: a third insulator Z41, an adapter plate Z42, a grounding copper bar Z43, a grounding copper column Z44, and a fifth spring Z45;

[0044] The third insulator Z41 is connected to the mounting bracket Z6 through an adapter plate Z42. A grounding copper bar Z43 is connected to the lower side of the third insulator Z41, and the grounding copper bar Z43 is connected to a grounding copper post Z44. A fifth spring Z45 is provided between the grounding copper bar Z43 and the grounding copper post Z44.

[0045] The high-voltage electrode busbar assembly Z3 includes: three fourth insulators Z31 and a high-voltage busbar Z32. The upper end of each fourth insulator Z31 is connected to the mounting bracket Z6, and the lower end of the fourth insulator Z31 is connected to the high-voltage busbar Z32.

[0046] Based on Figure 8 、 Figure 9 the automatic electrical connection process of the power frequency withstand voltage / partial discharge test of the current transformer:

[0047] Step 1): The automatic crimping device 1 of the primary terminals of the complete set of devices is fully pressed down by the corresponding cylinders to complete the electrical connection with the primary ends of 4 current transformers.

[0048] Step 2): The A-pole electrical contact automatic crimping mechanism Z1 and the B-pole electrical contact automatic crimping mechanism Z2 of the high-voltage switching device Z of the complete set of devices are simultaneously pressed down by their respective cylinders to achieve electrical contact with the high-voltage electrode copper bar Z3. The high-voltage electrode copper bar Z3 is connected to the high-voltage end of the withstand voltage / partial discharge tester through a wire.

[0049] Step 3): The automatic crimping device 2 of the secondary terminals of the complete set of devices is pressed down by the corresponding cylinders. The electric claws of the secondary component Z23 are electrically connected to the secondary terminals of the current transformer, and the grounding copper rod 233 is connected to the corresponding ground electrode. The electric claw 232 is connected to the loop controller through a wire. Through the controller switching, the secondary terminals of the current transformer are short-circuited and connected to the low-voltage end of the withstand voltage / partial discharge tester.

[0050] Based on Figure 8 、 Figure 9 the automatic electrical connection process of the induced withstand voltage test of the current transformer:

[0051] Step 1): The automatic crimping device 1 of the primary terminals of the complete set of devices is fully pressed down by the corresponding cylinders to complete the electrical connection with the primary ends of 4 current transformers.

[0052] Step 2): The automatic crimping device 2 of the secondary terminals of the complete set of devices is pressed down by the corresponding cylinders to be electrically connected to the secondary terminals.

[0053] Step 3): The loop controller of the secondary terminals switches the secondary b end of the current transformer to be grounded and the a end to be suspended.

[0054] Step 4): The A-pole electric contact automatic crimping mechanism Z1 of the high-voltage switching device Z of the complete set of devices presses down through the corresponding cylinder to make the switching copper bar in electrical contact with the high-voltage electrode busbar Z3 (the busbar is connected to the high-voltage power supply through a wire), and the B-pole electric contact automatic crimping mechanism Z2 pulls back through the corresponding cylinder to make its switching copper bar in electrical contact with the grounding copper column of the B-pole floor assembly Z5 (connected to the low end of the high-voltage power supply through a wire);

[0055] Step 5): The secondary terminal controller switches the grounding of the secondary a-terminal of the mutual inductor and the b-terminal is suspended;

[0056] Step 6): The B-pole electric contact automatic crimping mechanism Z2 of the high-voltage switching device Z of the complete set of devices presses down through the corresponding cylinder to make the switching copper bar in electrical contact with the high-voltage electrode busbar Z3, and the A-pole electric contact automatic crimping mechanism Z1 pulls back through the corresponding cylinder to make electrical contact with the grounding copper column of the A-pole floor assembly Z4.

[0057] The complete set of devices in this embodiment can simultaneously perform three high-voltage tests on 4 mutual inductors, namely power frequency withstand voltage, partial discharge, and induced withstand voltage, realizing full automation of high-voltage tests, shortening the production line beat, and greatly improving the detection efficiency.

[0058] The automatic electrical connection device for error testing provided by the present invention is a standardized automatic device for voltage transformer tests. It can simultaneously realize the automatic electrical connection of 2 mutual inductors. It is not only applicable to error testing but also to the volt-ampere characteristic and turn-to-turn insulation testing of 2 grouped mutual inductors. Through combination and electrical series / parallel connection, it can also realize the insulation resistance testing and withstand voltage test of multiple grouped mutual inductors, greatly improving the automation detection efficiency, simplifying the automation equipment for transformer tests, and enhancing the universality of the automatic electrical connection device.

[0059] The key-type electric claws of the secondary terminal automatic crimping device provided by the present invention solve the problem of unsafe discharge caused by too small electrical clearance in high-voltage tests. At the same time, the electrical contact is more flexible and reliable, improving the service life of the equipment.

[0060] The high-voltage switching device provided by the present invention, in cooperation with the withstand voltage / partial discharge test automatic electrical connection device, synchronously completes the power frequency withstand voltage, induced withstand voltage, and partial discharge tests of the mutual inductor, enhancing the function of the mutual inductor automatic detection production line.

[0061] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An automatic electrical connection complete set for voltage transformer tests, characterized in that, it includes: At least one set of automatic electrical connection complete sets for transformer error tests; The automatic electrical connection complete set for transformer error tests includes a primary terminal automatic crimping device and a secondary terminal automatic crimping device; the primary terminal automatic crimping device is used for the automatic electrical connection between the primary terminal of the transformer to be tested and the electrical device, The secondary terminal automatic crimping device is used for the automatic electrical connection between the secondary terminal of the transformer to be tested and the electrical device; the crimping head of the secondary terminal automatic crimping device is a piano key type electric claw; The 4-position piano key type electric claw includes an insulating base plate, both ends of the insulating base plate are connected to the insulating mounting plate through T-shaped connecting frames, a connecting shaft is connected between the T-shaped connecting frames, 4 second insulating sleeves are sleeved on the shaft, a piano key type copper row is sleeved on each second insulating sleeve, second insulating sleeves are arranged between the piano key type copper row and the T-shaped connecting frame and between adjacent piano key type copper rows, and the piano key type copper row is connected to the insulating mounting plate through a second spring; the grounding rod includes a third spring, the third spring is sleeved on the grounding copper rod, and the upper end of the grounding copper rod is connected to the insulating mounting plate; The primary terminal automatic crimping device includes a first crimping cylinder, the lower side of the first crimping cylinder is connected to the upper side of the horizontal movement positioning mechanism, the lower side of the horizontal movement positioning mechanism is connected to two groups of primary terminal electrical connection components, each group of electrical connection components includes 2 crimping heads, and the two groups form a 2x2 contact electrical contact mechanism, which can realize the automatic electrical connection of the primary terminals of 2 voltage transformers; The horizontal movement positioning mechanism includes a support frame, the bottom of the support frame is connected to two parallel guide rail mounting plates, the guide rail mounting plates are connected to guide rails, two slide plates are connected between the guide rails through sliders, and each slide plate is connected to a primary terminal electrical connection component below and moves towards or away from each other through the drive of an electric cylinder; When two sets of automatic electrical connection devices for transformer error tests form a 4-position automatic electrical connection complete set for transformer insulation resistance tests; The same-position crimping plates of the primary terminal automatic crimping devices of the two sets of automatic electrical connection devices for transformer error tests are connected in series through wires and then connected in equal potential parallel to form an electrical short circuit, and are connected to the high-voltage end of the insulation resistance tester through wires; the 4-position electric claws of the secondary terminal automatic crimping devices of the two sets of automatic electrical connection devices for transformer error tests are connected to the input end of the test circuit control switch through wires, and the output end of the test circuit control switch is connected to the low-voltage end of the insulation resistance tester.

2. The automatic electrical connection complete set for voltage transformer tests according to claim 1, characterized in that, The front and rear ends of the support frame are respectively connected to an electric cylinder mounting plate and an electric cylinder, and the electric cylinder push rod connecting piece is of an L-shaped structure and is respectively connected to the electric cylinder push rod and the slide plate; A magnetic induction sheet is arranged at the end of each slide plate close to the sensor side, and cooperates with the magnetic induction sensor to output an electric cylinder braking signal to the PLC, and the magnetic induction sensors are arranged on the left and right sides of the support frame; The primary terminal electrical connection components are two groups. The first insulators of each group of primary terminal electrical connection components are vertically arranged. The upper ends of the first insulators are connected to the slide plate through the first shaft seats. The lower ends of the first insulators are connected to the crimping plates. Guide seats are connected in the shaft holes at both ends of the crimping plates. The crimping copper posts pass through the holes in the middle of the guide seats. Springs are sleeved upward from below the crimping copper posts. The inner seat of the crimping head is screwed into the external thread at the lower end of the crimping copper post.

3. The automatic electrical connection complete set device for voltage transformer tests according to claim 1, characterized in that the secondary terminal automatic crimping device includes an installation bracket, and a second crimping cylinder is connected to the installation bracket. The second crimping cylinder is connected to the secondary terminal electrical connection component; the structure of the secondary terminal electrical connection component includes an insulating installation plate, and two groups of 4-position electric claws are symmetrically connected below the insulating installation plate, and a grounding rod is symmetrically arranged in the middle; Each group of 4-position electric claws can simultaneously crimp a terminal of a double-secondary-winding type transformer. Two groups of 4-position electric claws can realize the automatic electrical connection of the secondary terminals of 2 double-secondary-winding voltage transformers.

4. An automatic electrical connection complete set device for voltage transformer tests according to claim 1, characterized in that it further includes a high-voltage switching device. A 4-position transformer withstand voltage / partial discharge test automatic electrical connection complete set device is composed of two groups of transformer error test automatic electrical connection devices and the high-voltage switching device: The isopotentials are formed by series connection of the corresponding crimping plates of the primary terminal automatic crimping devices of the two groups of transformer error test automatic electrical connection devices through wires; two series connections form two different isopotential ends, and then they are respectively connected to the corresponding switching copper bars of the A-pole electrical contact automatic crimping mechanism and the B-pole electrical contact automatic crimping mechanism of the high-voltage switching device through wires; the 4-position electric claws of the secondary terminal automatic crimping devices of the two groups of transformer error test automatic electrical connection devices are connected to the input end of the test circuit control switch through wires.

5. The automatic electrical connection complete set device for voltage transformer tests according to claim 4, characterized in that the high-voltage switching device includes an A-pole electrical contact automatic crimping mechanism and a B-pole electrical contact automatic crimping mechanism; the switching copper bars of the A-pole electrical contact automatic crimping mechanism and the B-pole electrical contact automatic crimping mechanism are respectively connected to the crimping plates of the primary terminal electrical connection components of the primary terminal automatic crimping device through wires. The switching copper bars are switched between the high-voltage electrode and the grounding electrode by the reciprocating movement of the crimping mechanism to realize different types of withstand voltage tests for the transformer; the A-pole electrical contact automatic crimping mechanism, the B-pole electrical contact automatic crimping mechanism, the high-voltage electrode busbar assembly, the A-pole floor assembly and the B-pole floor assembly are all connected to the installation frame; both the A-pole electrical contact automatic crimping mechanism and the B-pole electrical contact automatic crimping mechanism include a third crimping cylinder. The upper end of the third crimping cylinder is connected to the installation frame through its installation support member, and the lower end is sequentially connected to the second shaft seat and the second insulator through the cylinder adapter plate; The high-voltage copper column is sleeved into the inner hole above the switching copper busbar. There is a convex step on the high-voltage copper column so that it is placed above the switching copper busbar. The fourth spring is sleeved onto the high-voltage copper column, and the fourth spring and the copper column are sleeved into the hole at the lower end of the second insulator. The copper column nut is screwed into the external thread at the upper part of the high-voltage copper column, and the switching copper busbar is fixed to the second insulator, so that the fourth spring is compressed into an elastic state inside the second insulator; Both the A-pole floor assembly and the B-pole floor assembly include a third insulator. The third insulator is connected to the mounting bracket through an adapter plate. The lower end of the third insulator is connected to the grounding copper busbar, and the grounding copper busbar is connected to the grounding copper column. A fifth spring is arranged between the grounding copper busbar and the grounding copper column; The high-voltage electrode busbar assembly includes three fourth insulators and a high-voltage busbar. The upper end of each fourth insulator is connected to the mounting bracket, and the lower end is connected to the high-voltage busbar.

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