CN212113428U - Oil-immersed simple vacuum on-load tap-changer - Google Patents
Oil-immersed simple vacuum on-load tap-changer Download PDFInfo
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- CN212113428U CN212113428U CN202021244832.5U CN202021244832U CN212113428U CN 212113428 U CN212113428 U CN 212113428U CN 202021244832 U CN202021244832 U CN 202021244832U CN 212113428 U CN212113428 U CN 212113428U
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Abstract
The utility model discloses an oil-immersed simple vacuum on-load tap-changer, which comprises an oil chamber, a signal panel, a driving motor, a switching core, a tap selector and a transmission shaft I; the signal panel is arranged on the driving motor; the switching core comprises a supporting framework, an energy storage component, a vacuum arc extinguishing system, a cam system, an operation structure and a transmission shaft II; the supporting framework is arranged above the inner part of the oil chamber; the energy storage component is arranged on the upper part of the support framework and is meshed with the first transmission shaft and can drive the cam system to act with the operation structure; the vacuum arc extinguishing system is arranged at the bottom of the supporting framework; the cam system is arranged on the support framework and is linked with the energy storage component; the operating structure is arranged on the supporting framework and can be driven by the cam system to open and close an internal circuit of the vacuum arc extinguishing system. The utility model discloses it is small, with low costs, the fault rate is low, does not need regular oil strain or change transformer oil, and its shunting selector installs and keep apart with transformer body transformer oil phase in airtight oiliness room, and the fortune dimension cost is few.
Description
Technical Field
The utility model relates to an oily vacuum combination formula on-load tap-changer technical field, concretely an oily formula simple and easy type vacuum on-load tap-changer.
Background
The existing oil-immersed combined on-load tap-changer can only be used for the voltage regulation mode of Y-connection neutral point of a coil, and if the existing oil-immersed combined on-load tap-changer needs to be used for the voltage regulation mode of the coil except for the voltage regulation mode of Y-connection neutral point, the existing oil-immersed combined on-load tap-changer can only select a combined on-load tap-changer or three single-phase combined on-. The performance of the combined type on-load tap-changer is not good as that of the combined type on-load tap-changer, and when the combined type on-load tap-changer with good performance needs to be selected, only three single phases can be selected, so that the design and manufacturing cost of the transformer can be greatly increased.
In addition, the tapping selector of the existing oil-immersed combined on-load tapping switch is directly installed in the transformer, the tapping selector is in direct contact with the transformer oil of the transformer body, and due to mechanical abrasion of the switch in the operation process, abraded metal particles or solid particles can be dissipated in the transformer oil to pollute the transformer oil of the transformer body; when the tapping selector is in failure to cause contact burning loss, the tapping selector is directly arranged in the transformer body, and the capacity generated when the contact is burnt directly carries out carbonization and decomposition on the transformer oil in the transformer body to pollute the transformer oil in the transformer body; the existing tapping selector adopts sliding friction when the screw rod is used for transmission, so that the friction resistance is large, the abrasion is large, more metal particles are generated, more faults are generated, and the later-stage use and maintenance are inconvenient.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide an oil immersed vacuum on-load tap changer which is small in size, low in cost, free from the need of regular oil filtration or transformer oil replacement, and the tap selector of which is installed in the closed oil chamber and isolated from the transformer oil phase of the transformer body, and the rolling screw rod is used as the transmission rod.
The utility model aims at realizing through the following technical scheme:
an oil immersed simple vacuum on-load tap-changer comprises a fully sealed cylindrical oil chamber, a signal panel and a driving motor which are arranged outside the top of the oil chamber, a switching core and a tap selector which are respectively arranged in the oil chamber from top to bottom, and a first transmission shaft; the signal panel is arranged on the driving motor; the middle part of the transmission shaft I is meshed with the driving motor, the upper end of the transmission shaft I extends into the signal panel to be meshed with the signal panel, and the lower end of the transmission shaft I extends downwards into the oil chamber; the switching core comprises a supporting framework, an energy storage component, a vacuum arc extinguishing system, a cam system, an operation structure and a transmission shaft II; the supporting framework is arranged above the inner part of the oil chamber; the energy storage component is arranged at the upper part of the support framework and is meshed with the first transmission shaft and can drive the cam system to act with the operating structure; the vacuum arc extinguishing system is arranged at the bottom of the supporting framework; the cam system is arranged on the support framework and is linked with the energy storage component; the operating structure is arranged on the supporting framework and can be driven by the cam system to open and close an internal circuit of the vacuum arc extinguishing system; the upper end of the second transmission shaft is rotatably connected with the energy storage component, and the lower end of the second transmission shaft is connected with the tapping selector.
Furthermore, the support framework comprises a mounting plate, an insulating lath and a first insulating mounting plate; the mounting plate is fixed above the inner part of the oil chamber; the number of the insulating battens is multiple, and the insulating battens are vertically fixed around the bottom of the mounting plate; the insulating mounting plate I is fixed on the inner side of the bottom of the insulating lath; the mounting plate, the insulating lath and the insulating mounting plate form a cage-shaped structure.
Further, the energy storage component comprises an energy storage system, a groove poking piece, a mounting sleeve and a grooved wheel; the energy storage system is arranged on the mounting plate, and an energy storage end of the energy storage system is meshed with a lower end of the transmission shaft; the groove poking piece is arranged on the energy releasing end of the energy storage system and can rotate under the driving of the energy storage system; the grooved pulley is rotatably arranged on the mounting sleeve and matched with the groove shifting piece, and rotates under the action of shifting of the groove shifting piece, and rotates by 60 degrees once per action.
Furthermore, the vacuum arc extinguishing system comprises three vacuum arc extinguishing chamber groups and is arranged on the first insulating mounting plate, each vacuum arc extinguishing chamber group corresponds to one phase switching unit, each vacuum arc extinguishing chamber group is provided with three vacuum arc extinguishing chambers, and the three vacuum arc extinguishing chamber groups are arranged on the circumference at 120 degrees; the lower end of each vacuum arc-extinguishing chamber group is arranged on the first insulating mounting plate, and each vacuum arc-extinguishing chamber group is electrically connected with the tapping selector through a metal connecting plate; the bottom of the insulating lath is provided with a leading-out moving contact corresponding to each vacuum arc-extinguishing chamber group and electrically connected with the vacuum arc-extinguishing chamber of each vacuum arc-extinguishing chamber group; leading-out static contacts are arranged on the side wall of the oil chamber corresponding to the leading-out moving contacts in a one-to-one manner; one end of the leading-out static contact is in contact with and electrically connected with the leading-out moving contact, and the other end of the leading-out static contact extends out of the oil chamber and is connected with the transformer output sleeve and used for current leading-out.
Further, the cam system comprises an insulating transmission tube and an insulating cam; the insulating transmission pipe is sleeved outside the transmission shaft, the upper end of the insulating transmission pipe is fixed on the grooved pulley and synchronously rotates with the grooved pulley, and the lower end of the insulating transmission pipe is fixedly connected with the insulating cam; the insulating cam is a disc which is sleeved outside the transmission shaft and is provided with six bulges at the periphery.
Furthermore, the operating mechanisms are arranged above each vacuum arc-extinguishing chamber one to one, and each operating mechanism comprises a mounting bracket, a pull rod, a return spring and a lever; the mounting bracket is mounted on the inner side of the insulating lath and positioned above the vacuum arc-extinguishing chamber; the lower end of the pull rod is connected with the upper end of the vacuum arc extinguish chamber and can be pulled upwards to break an internal circuit of the vacuum arc extinguish chamber, the upper end of the pull rod penetrates through the mounting bracket upwards and extends above the mounting bracket, and an annular plug is fixed at the lower end of the pull rod; the reset spring is sleeved outside the pull rod and positioned between the mounting bracket and the annular plug, and is used for pushing the pull rod to move downwards for resetting so as to close the internal circuit of the vacuum arc extinguish chamber again; the lever is of an inverted L-shaped structure, the transverse section of the lever is positioned above the mounting bracket, and the vertical section of the lever is positioned between the mounting bracket and the insulating cam and can deflect towards the mounting bracket under the pushing of the peripheral bulge of the insulating cam; one end of the horizontal section of the lever, which is close to the insulating cam, is hinged on the mounting bracket, one end of the horizontal section of the lever, which is far away from the insulating cam, is hinged with the upper end of the pull rod, so that the insulating cam can push or pull the lever, and a ball bearing is arranged at the position, corresponding to the insulating cam, of the vertical end of the lever. Under the drive of an energy storage system, the vertical section of the lever deflects towards the mounting bracket under the pushing of the peripheral bulge of the insulating cam, so that the horizontal section upwarps by taking the hinged part as a circle center, the pull rod is pulled to move upwards to disconnect the internal circuit of the vacuum arc extinguish chamber, when the vertical section of the lever is positioned between the two bulges of the insulating cam, the vertical section does not bear the pushing force of the insulating cam any more, the pull rod is pushed back downwards to the original position under the action of the reset spring, and the internal circuit of the vacuum arc extinguish chamber is closed again.
Further, the energy storage system is a spring energy storage system, and the energy storage system adopts a spring energy storage system adopted in the existing on-load tap-changer.
Furthermore, each group of vacuum arc extinguishing chamber is provided with three vacuum arc extinguishing chambers, namely a V1 branch, a V2 branch and a V3 branch; and a transition resistor is arranged on the first insulating mounting plate between the V2 branch and the V3 branch.
Further, the oil chamber comprises a head cover, a box body, a flange, an insulating cylinder and a cylinder bottom; the head cover is fixed at the top of the box body; the bottom of the box body is fixed at the top of the flange; the signal panel and the driving motor are arranged on the top of the outer side of the box body; the mounting plate and the energy storage system are mounted in the box body; the flange is fixed at the top of the insulating cylinder; the insulating cylinder is an insulating cylinder body with an upper opening and a lower opening; the leading-out static contact is arranged on the wall of the insulating cylinder; a plurality of rows of tapping static contacts are fixed on the outer side of the lower part of the wall of the insulating cylinder from top to bottom; one end of the tapping static contact extends into the insulating cylinder, and the other end of the tapping static contact is positioned outside the insulating cylinder and is connected with a transformer coil tap; a support piece positioned above the tapping static contact is fixed on the inner side of the wall of the insulating cylinder; the cylinder bottom is fixed at the bottom of the insulating cylinder.
Furthermore, the joint of the head cover and the box body is sealed through a first sealing ring; the connection part of the box body and the flange is sealed through a second sealing ring; the joint of the flange and the insulating cylinder is sealed through a third sealing ring; the joint of the leading-out static contact and the insulating cylinder is sealed through a fourth sealing ring; the joint of the tapping static contact and the insulating cylinder is sealed by a sealing ring V; the joint of the support piece and the insulating cylinder is sealed through a sixth sealing ring; the connection part of the cylinder bottom and the insulating cylinder is sealed by a seventh sealing ring.
Furthermore, the tapping selector comprises a fixed cage-shaped support, a moving contact system and a guide rod.
The fixed cage-shaped support is arranged in the insulating cylinder and comprises a second insulating mounting plate, a third insulating mounting plate and an insulating support piece; the second insulating mounting plate is transversely fixed on the support; the insulating mounting plate III is transversely arranged below the insulating mounting plate II; the insulating support piece is arranged between the second insulating mounting plate and the third insulating mounting plate, and two ends of the insulating support piece are respectively fixed on the second insulating mounting plate and the third insulating mounting plate; a bearing hole is respectively arranged on the second insulating mounting plate and the third insulating mounting plate correspondingly; bearing seats are arranged in the bearing holes of the second insulating mounting plate and the third insulating mounting plate, and bearings are arranged in the bearing seats; the second insulating mounting plate, the third insulating mounting plate and the insulating support piece form a fixed cage-shaped structure together.
The moving contact system comprises a screw rod, an insulating mounting plate IV, a ball nut, a sleeve, an insulating support, a moving contact and a shielding case; the screw rod is positioned between the second insulating mounting plate II and the third insulating mounting plate, two ends of the screw rod are respectively mounted in bearings of the second insulating mounting plate II and the third insulating mounting plate, and the top of the screw rod extends upwards out of the top of the second insulating mounting plate; the four insulating mounting plates are sleeved outside the screw rod and the insulating support and are positioned between the second insulating mounting plate and the third insulating mounting plate; the ball nut is connected outside the screw rod in a threaded manner; the sleeve is fixed at the top of the screw rod through a pin and is connected with the second transmission shaft; the insulating bracket is fixed on the four outer sides of the insulating mounting plate corresponding to the guide rod; the moving contact is arranged on the insulating support and is in contact with the guide rod; the shielding case is installed on the fourth insulating installation plate and is located right above the ball nut.
The guide rods are a plurality of metal rods arranged on the outer side of the insulating support piece, each guide rod corresponds to one row of tapping static contacts, the guide rods are arranged between the second insulating mounting plate and the third insulating mounting plate, and two ends of each guide rod are respectively fixed on the second insulating mounting plate and the third insulating mounting plate; and a contact electrically connected with the upper end of the guide rod is arranged on the second insulating mounting plate corresponding to the upper end of the guide rod, and the contact is in contact with and electrically connected with the metal connecting plate of the switching core.
The utility model discloses possess following advantage:
(1) on-load tap-changer is all littleer than traditional combination formula switch in external diameter size and height, design and manufacturing cost are little.
(2) Select for use combination formula on-load tap-changer when transformer coil design for except that Y connects the voltage regulation mode outside the neutral point, select for use the utility model discloses on-load tap-changer is than selecting for use traditional combination formula on-load tap-changer cost will be low a lot.
(3) The utility model is arranged in the closed oil chamber, the generated particles are in the oil chamber and are not in contact with the transformer oil of the transformer body, the transformer body is not polluted, even if the contact burning loss does not damage the transformer body (when the tapping selector generates faults, such as the burning loss of moving and static contacts, the utility model is arranged in the oil chamber, the negative effect generated by the faults is in the oil chamber, thus the transformer body is not influenced) by adopting the ball screw, compared with the traditional sliding screw, the ball screw has flexible transmission, small friction resistance and high precision, the advantages enable the tapping selector to be not easy to be blocked and to act more accurately in the operation process, further reduce the fault rate of the tapping selector, and reduce the damage to the transformer caused by the fault of the tapping selector to the minimum or no damage.
(4) On-load tap-changer further reduces manufacturing cost with the electric operation part integrated to the switch head.
(5) On-load tap-changer is vacuum on-load tap-changer, can not decompose transformer oil when on-load tap-changer switches over, does not need regular oil strain or change transformer oil, has reduced the fortune maintenance cost for the later stage use of transformer.
Drawings
Fig. 1 is a diagram comparing the shapes of the tap changer of the present invention and the conventional tap changer;
fig. 2 is a schematic structural diagram of the oil-immersed simple vacuum on-load tap-changer of the present invention;
fig. 3 is a schematic structural view of a switching core in an oil immersed simple vacuum on-load tap changer of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 5 is a schematic diagram of the structure of the insulation cam adjusting the closing and opening of the V1-V3 branch circuit in FIG. 4;
FIG. 6 is an enlarged view of a portion of FIG. 2 at B;
fig. 7 is a schematic structural view of an oil chamber in the oil-immersed simple vacuum on-load tap-changer of the present invention;
fig. 8 is a schematic structural view of a tapping selector in an oil-immersed simple vacuum on-load tap changer of the present invention;
fig. 9 is a top view of the movable contact system in the tap selector;
shown in the figure: 1-signal disc, 2-driving motor, 3-oil chamber, 4-switching core, 5-tapping selector, 6-transmission shaft I, 7-transmission shaft II, 8-mounting plate, 9-insulating lath, 10-insulating mounting plate I, 11-energy storage system, 12-groove shifting piece, 13-mounting sleeve, 14-grooved pulley, 15-insulating transmission pipe, 16-insulating cam, 17-mounting bracket, 18-pull rod, 19-reset spring, 20-lever, 21-vacuum arc-extinguishing chamber, 22-metal connecting plate, 23-leading-out moving contact, 24-leading-out moving contact, 25-transition resistor, 26-annular plug, 27-ball bearing, 28-end cover, 29-sealing ring I, 30-box body, 31-a second sealing ring, 32-a flange, 33-a third sealing ring, 35-an insulating cylinder, 35-a fourth sealing ring, 36-a tapping static contact, 37-a fifth sealing ring, 38-a supporting piece, 39-a sixth sealing ring, 40-a cylinder bottom, 41-a seventh sealing ring, 42-a second insulating mounting plate, 43-a third insulating mounting plate, 44-an insulating supporting piece, 45-a bearing, 46-a bearing seat, 47-a guide rod, 48-a screw rod, 49-a fourth insulating mounting plate, 50-a ball nut, 51-a shielding cover, 52-an insulating support, 53-a movable contact, 54-a sleeve, 55-a pin and 56-a contact.
Detailed Description
The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.
It should be understood that the drawings of the present application are only used to match the contents disclosed in the specification, so as to be known and read by those skilled in the art, and not to limit the practical limitations of the present invention, so that the present application does not have any technical significance, and any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope of the present application without affecting the function and the achievable purpose of the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be considered as the scope of the present invention without substantial changes in the technical content.
As shown in fig. 2-9, the utility model discloses an oil-immersed simple vacuum on-load tap-changer, which comprises a fully-sealed cylindrical oil chamber 3 (the oil chamber 3 is responsible for bearing the whole switch and simultaneously separates a switching core 4 and a tap selector 5 from the outside), a signal panel 1 and a driving motor 2 which are arranged outside the top of the oil chamber 3, a switching core 4 (the switching core 4 is used for switching a transformer coil from one tap to another under the condition of no power interruption) and a tap selector 5 (is responsible for selecting a transformer coil tap), which are respectively arranged inside the oil chamber 3 from top to bottom, and a first transmission shaft 6 (which transmits the torque of the driving motor 2 to the switching core 4); the signal panel 1 is arranged on the driving motor 2; the middle part of the transmission shaft I6 is meshed with the driving motor 2, the upper end of the transmission shaft I extends into the signal panel 1 to be meshed with the signal panel 1, and the lower end of the transmission shaft I extends downwards into the oil chamber 3; the switching core 4 comprises a supporting framework, an energy storage component, a vacuum arc extinguishing system, a cam system, an operation structure and a second transmission shaft 7; the supporting framework is arranged above the inside of the oil chamber 3; the energy storage component is arranged at the upper part of the support framework and is meshed with the first transmission shaft 6 and can drive the cam system to act with the operation structure; the vacuum arc extinguishing system is arranged at the bottom of the supporting framework; the cam system is arranged on the support framework and is linked with the energy storage component; the operating structure is arranged on the supporting framework and can be driven by the cam system to open and close an internal circuit of the vacuum arc extinguishing system; the upper end of the second transmission shaft 7 is rotatably connected with the energy storage component, and the lower end of the second transmission shaft is connected with the tapping selector 5.
As shown in fig. 2 and 3, the support framework comprises a mounting plate 8, an insulating lath 9 and an insulating mounting plate I10; the mounting plate 8 is fixed above the inside of the oil chamber 3; the number of the insulating laths 9 is multiple, and the insulating laths are vertically fixed around the bottom of the mounting plate 8; the insulation mounting plate I10 is fixed on the inner side of the bottom of the insulation lath 9 (the insulation mounting plate I10 is used for fixing a vacuum arc extinguishing system, and the insulation level of the part is increased by slotting); the mounting plate 8, the insulating lath 9 and the insulating mounting plate 10 form a cage-shaped structure.
As shown in fig. 2 and 3, the energy storage component includes an energy storage system 11, a groove poking piece 12, a mounting sleeve 13 and a sheave 14; the energy storage system 11 is arranged on the mounting plate 8, and the energy storage end of the energy storage system 11 is meshed with the lower end of the first transmission shaft 6 (is responsible for energy storage, high-speed operation and locking of operation completion of the whole switching core 4, and the structure of the energy storage system adopts the currently common energy storage system); the groove poking piece 12 is arranged on the energy releasing end of the energy storage system 11 and can be driven by the energy storage system 11 to rotate; the mounting sleeve 13 is a tubular body fixed at the center of the bottom of the mounting plate 8; sheave 14 is rotatably mounted on mounting sleeve 13 and is engaged with groove-poking member 12, and sheave 14 can be poked by groove-poking member 12 to rotate for 60 degrees (groove-poking member 12 and sheave 14 also adopt the currently common structure for engaging with energy storage system 11).
As shown in fig. 2 to 4, the vacuum arc extinguishing system includes three vacuum arc extinguishing chamber groups and is installed on an insulating mounting plate one 10 (installed on the top of the edge of the insulating mounting plate one 10), each vacuum arc extinguishing chamber group corresponds to one phase switching unit, each vacuum arc extinguishing chamber group is provided with three vacuum arc extinguishing chambers 21, and the three vacuum arc extinguishing chamber groups are arranged on the circumference at 120 degrees; the lower end of each vacuum arc-extinguishing chamber group is arranged on the first insulating mounting plate 10, and each vacuum arc-extinguishing chamber group is electrically connected with the tapping selector 5 through a metal connecting plate 22; the bottom of the insulating lath 9 is provided with a leading-out moving contact 23 corresponding to each vacuum arc-extinguishing chamber group and electrically connected with the vacuum arc-extinguishing chamber of each vacuum arc-extinguishing chamber group; lead-out static contacts 24 (providing contacts for lead-out taps of the transformer) are arranged on the side wall of the oil chamber 3 corresponding to the lead-out moving contacts 23 in a one-to-one manner; one end of the leading-out static contact 24 is in contact with and electrically connected with the leading-out moving contact 23, and the other end of the leading-out static contact extends out of the oil chamber 3 to be connected with an output sleeve of the transformer and used for current leading-out. The leading movable contact 23 is matched with the leading fixed contact 24 to lead out the current of the switching core 4.
As shown in fig. 2 and 3, the cam system comprises an insulating transmission tube 15 and an insulating cam 16; the insulating transmission pipe 15 is sleeved outside the second transmission shaft 7, the upper end of the insulating transmission pipe is fixed on the grooved pulley 14 and synchronously rotates with the grooved pulley 14, and the lower end of the insulating transmission pipe is fixedly connected with the insulating cam 16; the insulating cam 16 is a disc which is sleeved outside the second transmission shaft 7 and is provided with six bulges at the periphery.
As shown in fig. 3 and 6, the operating mechanisms are arranged above each vacuum arc-extinguishing chamber 21 one by one, and comprise a mounting bracket 17, a pull rod 18, a return spring 19 and a lever 20; the mounting bracket 17 is mounted on the inner side of the insulating lath 9 and positioned above the vacuum arc-extinguishing chamber 21; the lower end of the pull rod 18 is connected with the upper end of the vacuum arc-extinguishing chamber 21 and can be pulled upwards to break an internal circuit of the vacuum arc-extinguishing chamber 21, the upper end of the pull rod upwards penetrates through the mounting bracket 17 and extends above the mounting bracket 17, and the lower end of the pull rod 18 is fixed with an annular plug 26; the reset spring 19 is sleeved outside the pull rod 18 and positioned between the mounting bracket 17 and the annular plug 26, and is used for pushing the pull rod 18 to move downwards to reset so as to close the circuit in the vacuum arc extinguish chamber 21 again; the lever 20 is of an inverted L-shaped structure, the transverse section of the lever is positioned above the mounting bracket 17, and the vertical section of the lever is positioned between the mounting bracket 17 and the insulating cam 16 and can deflect towards the mounting bracket 17 under the action of the convex periphery of the insulating cam 16; one end of the horizontal section of the lever 20 close to the insulating cam 16 is hinged on the mounting bracket 17, one end of the horizontal section far away from the insulating cam 16 is hinged with the upper end of the pull rod 18, and a ball bearing 27 is arranged at the vertical end of the lever 20 corresponding to the insulating cam 16 in order to facilitate the insulating cam 16 to push or pull the lever. Under the driving of the energy storage system 11, the vertical section of the lever 20 is pushed by the protrusion on the periphery of the insulating cam 16 to deflect towards the mounting bracket 17 by taking the hinged position of the lever 20 and the mounting bracket 17 as a circle center, so that the horizontal section of the lever 20 upwarps by taking the hinged position as the circle center, the pull rod 18 is pulled to move upwards to disconnect the internal circuit of the vacuum arc-extinguishing chamber 21, and the return spring 19 is in a compressed state at the moment; when the vertical section of the lever 20 is located between the two protrusions of the insulating cam (in the recessed portion), the vertical section of the lever 20 is no longer pushed by the insulating cam 16, and the pull rod 18 is pushed back to the original position downward under the elastic force of the return spring 19, so as to push the internal circuit of the vacuum interrupter 21 to be closed again.
Further, the energy storage system 11 is a spring energy storage system, and the energy storage system 11 is a spring energy storage system adopted in an existing on-load tap-changer.
As shown in fig. 4, each group of vacuum interrupter chambers is provided with three vacuum interrupter chambers 21, i.e., a V1 branch, a V2 branch, and a V3 branch; and a transition resistor 25 is arranged on the first insulating mounting plate 10 between the branch V2 and the branch V3. The transition resistor 25 is used when the two coils are bridged.
As shown in fig. 7, the oil chamber 3 includes a head cover 28, a case 30, a flange 32, an insulating tube 34, and a tube bottom 40; the head cover 28 is fixed (fixed by bolts or screws) on the top of the box body 30 to seal the top of the box body 30, and the joint of the head cover 28 and the box body 30 is sealed by a first sealing ring 29 (which is responsible for sealing the oil chamber 3 and supporting the driving motor 2); the bottom of the box body 30 is fixed (fixed through bolts or screws) on the top of the flange 32, the upper opening and the lower opening of the box body 30 (the top of the box body 30 is sealed by the head cover 28, the bottom of the box body is communicated with the inner hole of the flange 32 and the insulating cylinder 34), and the joint of the box body 30 and the flange 32 is sealed through a second sealing ring 31; the signal panel 1 and the driving motor 2 are arranged at the top of the outer side of the box body 30; the mounting plate 8 and the energy storage system 11 are mounted in the box body 30; the flange 32 is fixed (fixed by bolts or screws) at the top of the insulating cylinder 34, and the joint of the flange 32 and the insulating cylinder 34 is sealed by a third sealing ring 33; the insulating cylinder 34 is an insulating cylinder body with an upper opening and a lower opening, and is a supporting component of the whole switching core 4 and the tapping selector 5; the leading-out static contact 24 (made of metal conductive material) is arranged on the upper part of the wall of the insulating cylinder 34; the connection part of the leading-out static contact 24 and the insulating cylinder 34 is sealed through a fourth sealing ring 35; a plurality of rows of tapping static contacts 36 (a plurality of tapping static contacts are arranged in each row and made of metal conductive materials) are fixed on the outer side of the lower part of the wall of the insulating cylinder 34 from top to bottom; one end of the tapping static contact 36 extends into the insulating cylinder 34 and can be contacted with the moving contact 53, and the other end is positioned outside the insulating cylinder 34 and is connected with a transformer coil tap; the joint of the tapping static contact 36 and the insulating cylinder 34 is sealed by a seal ring five 37; a support 38 positioned above the tapping static contact 36 is fixed (fixed by a bolt or a screw) on the inner side of the wall of the insulating cylinder 34; the joint of the support 38 and the insulating cylinder 34 is sealed by a sealing ring six 39; the bottom 40 is fixed (fixed by bolts or screws) at the bottom of the insulating cylinder 34 to seal the bottom of the insulating cylinder 34, and the joint of the bottom 40 and the insulating cylinder 34 is sealed by a seven-seal ring 41.
As shown in fig. 8 and 9, the tap selector includes a fixed cage-shaped bracket, a movable contact system, and a guide rod 47.
The fixed cage-shaped bracket is arranged in the insulating cylinder 34 and comprises a second insulating mounting plate 42, a third insulating mounting plate 43 and an insulating support 44; the second insulating mounting plate 42 is transversely fixed on the supporting piece 38, and a plurality of grooves are formed in the second insulating mounting plate 42 (at special positions) to increase creepage distance, so that the capacity of increasing the insulating level of the switch is achieved; the third insulating mounting plate 43 is transversely arranged below the second insulating mounting plate 42; the insulating support pieces 44 (three insulating rod-shaped bodies which are uniformly arranged) are arranged between the second insulating mounting plate 42 and the third insulating mounting plate 43, and two ends of each insulating support piece are respectively fixed on the second insulating mounting plate 42 and the third insulating mounting plate 43 (the two ends of each insulating support piece 44 are thinned and are provided with external threads, and then pass through the second insulating mounting plate 42 and the third insulating mounting plate 43 and are respectively locked on the second insulating mounting plate 42 and the third insulating mounting plate 43 through insulating nuts); a bearing hole is respectively arranged on the second insulating mounting plate 42 and the third insulating mounting plate 43 correspondingly; bearing seats 46 are arranged in the bearing holes of the second insulating mounting plate 42 and the bearing holes of the third insulating mounting plate 43, and bearings 45 are arranged in the bearing seats 46; the second insulating mounting plate 42, the third insulating mounting plate 43 and the insulating support 44 form a fixed cage-shaped structure together.
The moving contact system comprises a screw rod 48, an insulating mounting plate IV 49, a ball nut 50, a sleeve 54, an insulating bracket 52, a moving contact 53 (made of metal conductive materials) and a shielding case 51; the screw rod 48 is positioned between the second insulating mounting plate 42 and the third insulating mounting plate 43, two ends of the screw rod are respectively mounted in the bearings 45 of the second insulating mounting plate 42 and the third insulating mounting plate 43, and the top of the screw rod 48 extends upwards out of the top of the second insulating mounting plate 42; the fourth insulating mounting plate 49 is sleeved outside the screw rod 48 and the insulating support 44, is positioned between the second insulating mounting plate 42 and the third insulating mounting plate 43, and is responsible for supporting the whole moving contact system; the ball nut 50 is in threaded connection with the outside of the screw rod 48 (in threaded fit with the screw rod 48), and the ball nut 50 is fixed on the insulating mounting plate IV 49 and is connected with the insulating mounting plate IV 49 into a whole; the sleeve 54 is fixed on the top of the screw rod 48 through a pin 55, is connected with the lower end of the second transmission shaft 7 and is driven by the second transmission shaft 7 to rotate, and is responsible for receiving and transmitting the moment of the moving contact system; the insulating supports 52 are fixed (fixed by bolts or screws) on the outer sides of the four insulating mounting plates 49 corresponding to the guide rods 47, and each insulating support 52 corresponds to one guide rod 47 and one row of tapping static contacts 36 and is responsible for supporting the moving contact 53; the moving contact 53 is mounted on the insulating support 52 and is in contact with (electrically connected with) the guide rod 47, and is responsible for selecting a transformer coil and transmitting the current of the transformer coil; the shielding cover 51 is installed on the fourth insulating mounting plate 49 and located right above the ball nut 50, and is responsible for shielding an electric field of the ball nut 50.
The guide rods 47 are a plurality of metal rods located outside the insulating support 44, each guide rod 47 corresponds to one row of tapping static contacts, the guide rods 47 are arranged between the second insulating mounting plate 42 and the third insulating mounting plate 43, and two ends of each guide rod 47 are respectively fixed on the second insulating mounting plate 42 and the third insulating mounting plate 43 (two ends of each guide rod 47 are respectively locked on the second insulating mounting plate 42 and the third insulating mounting plate 43 through nuts after passing through the second insulating mounting plate 42 and the third insulating mounting plate 43 by external threads); and a contact 56 which is electrically connected with the upper end of the guide rod 47 is arranged on the second insulating mounting plate 42 corresponding to the upper end of the guide rod 47, and the contact 56 is contacted and electrically connected with the metal connecting plate 22 of the switching core 4. Contact 56 cooperates with metal web 22 to conduct current from tap selector 5 to switching core 4.
The left diagram in fig. 1 is the on-load tap-changer of the present invention, and the right diagram is the conventional on-load tap-changer, and the dimensions of the two are compared as follows.
| The present on-load tap-changer | Traditional combined on-load tap-changer | |
| Outer diameter | 514mm | 570mm |
| Height | 841mm | 1813mm |
Therefore, the on-load tap-changer has the advantages that the volume, particularly the height, of the on-load tap-changer is obviously smaller than that of a traditional on-load tap-changer, and the manufacturing cost can be greatly reduced.
When the driving motor 2 rotates to drive the first transmission shaft 6 to rotate, the first transmission shaft 6 transmits torque to the energy storage system 11 and the signal panel 1; the energy storage system 11 receives the torque, stores energy by itself, transmits the torque to the sleeve 54 of the tapping selector 5 through the second transmission shaft 7, receives the torque by the sleeve 54 and transmits the torque to the screw rod 48; the screw rod 48 rotates to drive the moving contact system of the tapping selector 5 to slide so as to select the transformer coil tap; after the tap of the transformer coil is selected, the energy storage system 11 stores energy, releases the energy instantly to drive the cam system to rotate at a high speed, and the cam system rotates to switch on and off the vacuum arc extinguishing system according to a preset program, so that current is switched from one tap to the other tap of the transformer coil, and voltage regulation is completed; meanwhile, the signal panel 1 gives a stop signal to the driving motor 2, and the driving motor 2 stops running.
The moving contact system of the tapping selector 5 is matched with the tapping static contact 36 of the tapping selector 5, a transformer tap is selected in advance, and the moving contact system is driven by the ball nut 50 and the ball screw 48 to slide up and down; the conductor bars 47 transmit the current of the coil taps to the movable contact system. The specific operation is as follows: when the sleeve 54 receives the torque transmitted by the second transmission shaft 7, the screw rod 48 is driven to rotate, and the screw rod 48 transmits the torque to the ball nut 50; the ball nut 50 drives the four insulating mounting plates 49 to move up and down along the guide rods 47, the moving of the four insulating mounting plates 47 drives the moving contacts 53 to slide up and down along the guide rods 47, and the moving contacts 47 slide up and down to realize the disconnection or connection with the tapping static contacts 36, so that the transformer coils are selected.
As shown in fig. 5, a, the switch is in a quiescent state. When the energy storage system 11 releases energy to drive the groove poking piece 12 to rotate, the groove poking piece 12 pokes the grooved pulley 14 to rotate, the grooved pulley 14 and the insulating transmission pipe 15 of the cam system are fixed into a whole to drive the insulating cam 16 of the cam system to rotate together, according to a preset program, when the insulating cam 16 rotates, the protrusion on the periphery of the insulating cam 16 pokes the corresponding vertical section of the lever 20 to deflect towards the direction of the mounting bracket 17, so that the horizontal section of the lever 20 is upwards tilted by taking a hinged point of the lever on the mounting bracket 17 as a circle center, and the pull rod 18 is pulled to upwards move to disconnect the internal circuit of the vacuum arc-; with the rotation of the insulating cam 16, when the vertical section of the lever 20 is located between two protrusions of the insulating cam 16 (i.e. when the insulating cam 16 rotates according to a preset program, so that the area between two adjacent protrusions on the periphery of the insulating cam 16 is opposite to the vertical section of the lever 20), the vertical section of the lever 20 is no longer pushed by the insulating cam 16, and under the elastic force of the return spring 19, the pull rod 18 is pushed back downwards to the original position, and the internal circuit of the vacuum interrupter 21 corresponding to the lever 20 is re-closed. That is, the lever 20 drives the pull rod 18 to move up and down under the poking or pushing of the insulating cam 16, and the pull rod 18 drives the circuit inside the vacuum arc-extinguishing chamber 21 to be opened and closed.
As shown in b in fig. 5, the peripheral protrusion of the insulating cam 16 rotates to the side of the vertical section of the lever 20 corresponding to the branch V2 (i.e. when the vertical section of the lever 20 is located between two peripheral protrusions of the insulating cam 16), the lever 20 corresponding to the branch V2 is not pushed by the insulating cam 16, at this time, under the action of the return spring 20, the pull rod 18 is pushed back downward to the original position, the internal circuit of the vacuum interrupter 21 corresponding to the lever 20 is closed, and the branch V2 is closed.
As shown in c in fig. 5, the insulating cam 16 continues to rotate according to the preset program, the protrusion on the periphery of the insulating cam 16 rotates to contact with the vertical section of the lever 20 corresponding to the V1 branch and pokes the lever 20 of the V1 branch, the protrusion on the periphery of the insulating cam 16 pokes or pushes the vertical section of the lever 20 of the V1 branch to deflect towards the mounting bracket 17, so that the horizontal section of the lever 20 tilts upward with the hinged joint as a center, the pull rod 18 is pulled to move upward to disconnect the internal circuit of the V1 branch vacuum interrupter 21, and the V1 branch is also disconnected.
As shown in d of fig. 5, the insulating cam 16 continues to rotate according to the preset program, the protrusion on the periphery of the insulating cam 16 rotates to the side of the vertical section of the lever 20 of the branch V3 (i.e. when the vertical section of the lever 20 of the branch V3 is located between two peripheral protrusions of the insulating cam 16), the lever 20 of the branch V3 is not pushed by the insulating cam 16, at this time, under the elastic force of the return spring 19, the pull rod 18 is pushed back downwards to the original position, the internal circuit of the vacuum interrupter 21 corresponding to the lever 20 is re-closed, and the branch V3 is closed.
As shown in e in fig. 5, similarly, the insulating cam 16 continues to rotate according to a preset program, and finally the lever 20 of the V2 branch is toggled, the protrusion on the periphery of the insulating cam 16 rotates to contact with the vertical section of the lever 20 corresponding to the V2 branch and pushes or toggles the lever 20 of the V2 branch, when the protrusion on the periphery of the insulating cam 16 pushes or toggles, the vertical section of the lever 20 of the V2 branch deflects toward the mounting bracket 17, so that the horizontal section of the lever 20 tilts up with the hinged point as a circle center, the pull rod 18 is pulled to move up to disconnect the internal circuit of the vacuum arc-extinguishing chamber 21 of the V2 branch, and thus the V2 branch is disconnected, the whole process is completed by switching once, and the current passes through the original V1 branch by switching to the V3.
The protection scope of the present invention is not limited to the technical solution disclosed in the specific embodiment, and all the modifications, equivalent replacements, improvements, etc. made by the technical entity of the present invention to the above embodiments all fall into the protection scope of the present invention.
Claims (10)
1. An oil immersed simple vacuum on-load tap-changer comprises an oil chamber, a signal panel, a driving motor, a switching core, a tap selector and a transmission shaft I; the signal panel is arranged on the driving motor; the middle part of the transmission shaft I is meshed with the driving motor, the upper end of the transmission shaft I extends into the signal panel to be meshed with the signal panel, and the lower end of the transmission shaft I extends downwards into the oil chamber; the method is characterized in that: the switching core comprises a supporting framework, an energy storage component, a vacuum arc extinguishing system, a cam system, an operation structure and a transmission shaft II; the supporting framework is arranged above the inner part of the oil chamber; the energy storage component is arranged at the upper part of the support framework and is meshed with the first transmission shaft and can drive the cam system to act with the operating structure; the vacuum arc extinguishing system is arranged at the bottom of the supporting framework; the cam system is arranged on the support framework and is linked with the energy storage component; the operating structure is arranged on the supporting framework and can be driven by the cam system to open and close an internal circuit of the vacuum arc extinguishing system; the upper end of the second transmission shaft is rotatably connected with the energy storage component, and the lower end of the second transmission shaft is connected with the tapping selector.
2. The oil-immersed simple vacuum on-load tap-changer according to claim 1, characterized in that: the supporting framework comprises a mounting plate, an insulating lath and a first insulating mounting plate; the mounting plate is fixed above the inner part of the oil chamber; the number of the insulating battens is multiple, and the insulating battens are vertically fixed around the bottom of the mounting plate; the insulating mounting plate I is fixed on the inner side of the bottom of the insulating lath; the mounting plate, the insulating lath and the insulating mounting plate form a cage-shaped structure.
3. The oil-immersed simple vacuum on-load tap-changer according to claim 2, characterized in that: the energy storage component comprises an energy storage system, a groove poking piece, a mounting sleeve and a grooved wheel; the energy storage system is arranged on the mounting plate, and an energy storage end of the energy storage system is meshed with a lower end of the transmission shaft; the groove poking piece is arranged on the energy releasing end of the energy storage system and can rotate under the driving of the energy storage system; the grooved pulley is rotatably arranged on the mounting sleeve and matched with the groove shifting piece, and rotates under the action of shifting of the groove shifting piece, and rotates by 60 degrees once per action.
4. The oil-immersed simple vacuum on-load tap-changer according to claim 3, characterized in that: the vacuum arc extinguishing system comprises three vacuum arc extinguishing chamber groups and is arranged on the first insulating mounting plate, each vacuum arc extinguishing chamber group corresponds to one phase switching unit, each vacuum arc extinguishing chamber group is provided with three vacuum arc extinguishing chambers, and the three vacuum arc extinguishing chamber groups are arranged on the circumference at an angle of 120 degrees; the lower end of each vacuum arc-extinguishing chamber group is arranged on the first insulating mounting plate, and each vacuum arc-extinguishing chamber group is electrically connected with the tapping selector through a metal connecting plate; the bottom of the insulating lath is provided with a leading-out moving contact corresponding to each vacuum arc-extinguishing chamber group and electrically connected with the vacuum arc-extinguishing chamber of each vacuum arc-extinguishing chamber group; leading-out static contacts are arranged on the side wall of the oil chamber corresponding to the leading-out moving contacts in a one-to-one manner; one end of the leading-out static contact is in contact with and electrically connected with the leading-out moving contact, and the other end of the leading-out static contact extends out of the oil chamber and is connected with the transformer output sleeve and used for current leading-out.
5. The oil-immersed simple vacuum on-load tap-changer according to claim 4, characterized in that: the cam system comprises an insulating transmission pipe and an insulating cam; the insulating transmission pipe is sleeved outside the transmission shaft, the upper end of the insulating transmission pipe is fixed on the grooved pulley and synchronously rotates with the grooved pulley, and the lower end of the insulating transmission pipe is fixedly connected with the insulating cam; the insulating cam is a disc which is sleeved outside the transmission shaft and is provided with six bulges at the periphery.
6. The oil-immersed simple vacuum on-load tap-changer according to claim 5, characterized in that:
the operating mechanisms are arranged above each vacuum arc-extinguishing chamber one to one and comprise mounting brackets, pull rods, return springs and levers; the mounting bracket is mounted on the inner side of the insulating lath and positioned above the vacuum arc-extinguishing chamber; the lower end of the pull rod is connected with the upper end of the vacuum arc extinguish chamber and can be pulled upwards to break an internal circuit of the vacuum arc extinguish chamber, the upper end of the pull rod penetrates through the mounting bracket upwards and extends above the mounting bracket, and an annular plug is fixed at the lower end of the pull rod; the reset spring is sleeved outside the pull rod and positioned between the mounting bracket and the annular plug, and is used for pushing the pull rod to move downwards for resetting so as to close the internal circuit of the vacuum arc extinguish chamber again; the lever is of an inverted L-shaped structure, the transverse section of the lever is positioned above the mounting bracket, and the vertical section of the lever is positioned between the mounting bracket and the insulating cam and can deflect towards the mounting bracket under the pushing of the peripheral bulge of the insulating cam; one end of the lever transverse section, which is close to the insulating cam, is hinged on the mounting bracket, and the other end of the lever transverse section, which is far away from the insulating cam, is hinged with the upper end of the pull rod; under the drive of an energy storage system, the vertical section of the lever deflects towards the mounting bracket under the pushing of the peripheral bulge of the insulating cam, so that the horizontal section upwarps by taking the hinged part as a circle center, the pull rod is pulled to move upwards to disconnect the internal circuit of the vacuum arc extinguish chamber, when the vertical section of the lever is positioned between the two bulges of the insulating cam, the vertical section does not bear the pushing force of the insulating cam any more, the pull rod is pushed back downwards to the original position under the action of the reset spring, and the internal circuit of the vacuum arc extinguish chamber is closed again.
7. The oil-immersed simple vacuum on-load tap-changer according to claim 1, characterized in that: each group of vacuum arc extinguishing chamber is provided with three vacuum arc extinguishing chambers, namely a V1 branch, a V2 branch and a V3 branch; and a transition resistor is arranged on the first insulating mounting plate between the V2 branch and the V3 branch.
8. The oil-immersed simple vacuum on-load tap-changer according to any one of claims 4 to 6, characterized in that: the oil chamber comprises a head cover, a box body, a flange, an insulating cylinder and a cylinder bottom; the head cover is fixed at the top of the box body; the bottom of the box body is fixed at the top of the flange; the signal panel and the driving motor are arranged on the top of the outer side of the box body; the mounting plate and the energy storage system are mounted in the box body; the flange is fixed at the top of the insulating cylinder; the insulating cylinder is an insulating cylinder body with an upper opening and a lower opening; the leading-out static contact is arranged on the wall of the insulating cylinder; a plurality of rows of tapping static contacts are fixed on the outer side of the lower part of the wall of the insulating cylinder from top to bottom; one end of the tapping static contact extends into the insulating cylinder, and the other end of the tapping static contact is positioned outside the insulating cylinder and is connected with a transformer coil tap; a support piece positioned above the tapping static contact is fixed on the inner side of the wall of the insulating cylinder; the cylinder bottom is fixed at the bottom of the insulating cylinder.
9. The oil-immersed simple vacuum on-load tap-changer according to claim 8, characterized in that: the joint of the head cover and the box body is sealed through a first sealing ring; the connection part of the box body and the flange is sealed through a second sealing ring; the joint of the flange and the insulating cylinder is sealed through a third sealing ring; the joint of the leading-out static contact and the insulating cylinder is sealed through a fourth sealing ring; the joint of the tapping static contact and the insulating cylinder is sealed by a sealing ring V; the joint of the support piece and the insulating cylinder is sealed through a sixth sealing ring; the connection part of the cylinder bottom and the insulating cylinder is sealed by a seventh sealing ring.
10. The oil-immersed simple vacuum on-load tap-changer according to claim 8, characterized in that: the tapping selector comprises a fixed cage-shaped bracket, a moving contact system and a guide rod; the fixed cage-shaped support is arranged in the insulating cylinder and comprises a second insulating mounting plate, a third insulating mounting plate and an insulating support piece; the second insulating mounting plate is transversely fixed on the support; the insulating mounting plate III is transversely arranged below the insulating mounting plate II; the insulating support piece is arranged between the second insulating mounting plate and the third insulating mounting plate, and two ends of the insulating support piece are respectively fixed on the second insulating mounting plate and the third insulating mounting plate; a bearing hole is respectively arranged on the second insulating mounting plate and the third insulating mounting plate correspondingly; bearing seats are arranged in the bearing holes of the second insulating mounting plate and the third insulating mounting plate, and bearings are arranged in the bearing seats; the second insulating mounting plate, the third insulating mounting plate and the insulating support piece form a fixed cage-shaped structure together; the moving contact system comprises a screw rod, an insulating mounting plate IV, a ball nut, a sleeve, an insulating support, a moving contact and a shielding case; the screw rod is positioned between the second insulating mounting plate II and the third insulating mounting plate, two ends of the screw rod are respectively mounted in bearings of the second insulating mounting plate II and the third insulating mounting plate, and the top of the screw rod extends upwards out of the top of the second insulating mounting plate; the four insulating mounting plates are sleeved outside the screw rod and the insulating support and are positioned between the second insulating mounting plate and the third insulating mounting plate; the ball nut is connected outside the screw rod in a threaded manner; the sleeve is fixed at the top of the screw rod through a pin and is connected with the second transmission shaft; the insulating bracket is fixed on the four outer sides of the insulating mounting plate corresponding to the guide rod; the moving contact is arranged on the insulating support and is in contact with the guide rod; the shielding cover is arranged on the fourth insulating mounting plate and is positioned right above the ball nut; the guide rods are a plurality of metal rods arranged on the outer side of the insulating support piece, each guide rod corresponds to a row of tapping static contacts, the guide rods are arranged between the second insulating mounting plate and the third insulating mounting plate, and two ends of each guide rod are respectively fixed on the second insulating mounting plate and the third insulating mounting plate; and a contact electrically connected with the upper end of the guide rod is arranged on the second insulating mounting plate corresponding to the upper end of the guide rod, and the contact is in contact with and electrically connected with the metal connecting plate of the switching core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021244832.5U CN212113428U (en) | 2020-07-01 | 2020-07-01 | Oil-immersed simple vacuum on-load tap-changer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021244832.5U CN212113428U (en) | 2020-07-01 | 2020-07-01 | Oil-immersed simple vacuum on-load tap-changer |
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| CN212113428U true CN212113428U (en) | 2020-12-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816232A (en) * | 2020-12-31 | 2021-05-18 | 北京中瑞和电气有限公司 | Arc discharge explosion-proof test device in on-load tap-changer oil |
-
2020
- 2020-07-01 CN CN202021244832.5U patent/CN212113428U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112816232A (en) * | 2020-12-31 | 2021-05-18 | 北京中瑞和电气有限公司 | Arc discharge explosion-proof test device in on-load tap-changer oil |
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| TR01 | Transfer of patent right |
Effective date of registration: 20221227 Address after: 563000 A1 (office building), Phase I of Relocation and Capacity Expansion Technical Transformation Project, No. 1, Wuhan Road, Huichuan District, Zunyi, Guizhou Patentee after: Guizhou Chenting Power Equipment Manufacturing Co.,Ltd. Address before: No. 561, Linchuan Road, Zunyi District, Guizhou Province Patentee before: GUIZHOU CHANGZHENG ELECTRIC Co.,Ltd. |
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