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CN-117169784-B - Transformer test device

CN117169784BCN 117169784 BCN117169784 BCN 117169784BCN-117169784-B

Abstract

The invention discloses a transformer test device, which comprises three bus bar copper assemblies, two sliding contact assemblies and a pushing device, wherein the three bus bar copper assemblies are electrically connected with 3-phase sleeve wiring terminals of a transformer respectively, the two sliding contact assemblies comprise a plurality of sliding block contacts in sliding fit, the sliding block contacts are arranged at intervals, the bus bar copper assemblies are connected and disconnected through the sliding contact assemblies, and the pushing device is used for driving the sliding block contacts of the sliding contact assemblies to move so as to enable the sliding block contacts to be electrically connected or disconnected. The operation personnel can realize the quick connection and disconnection between the transformer terminals through controlling the pushing device, and meanwhile, the structure is simple and the operation is convenient. And when the opening and closing device is in a closing state, the contact of the sliding block contacts is realized, compared with a disconnecting link, the contact between the sliding block contacts is surface contact, the contact is more reliable, the contact area is larger, the shearing force during opening and closing of the disconnecting link is not generated, and the problem of abrasion of the contact surface is solved.

Inventors

  • ZHANG PENGFEI
  • He Houpeng
  • DENG XINFENG
  • HAO YI
  • HAN XIAOXIANG
  • LI ZENGHONG
  • GUO DONGDONG
  • MA ZHANGSHUN
  • WANG SHANSHAN

Assignees

  • 西安西电变压器有限责任公司
  • 中国西电电气股份有限公司

Dates

Publication Date
20260505
Application Date
20230907

Claims (13)

  1. 1. A transformer test device, characterized by comprising a switching-on/off device (100), the switching-on/off device (100) comprising: the three bus bar copper bar assemblies (120) are respectively electrically connected with the 3-phase sleeve wiring terminals of the transformer; The sliding contact assembly (130) comprises a plurality of sliding contact heads (132) which are matched in a sliding way, each sliding contact head (132) is arranged at intervals, a first bus bar copper assembly (120) and a second bus bar copper assembly (120) are respectively and electrically connected to different sliding contact heads (132) of one sliding contact assembly (130), a second bus bar copper assembly (120) and a third bus bar copper assembly (120) are respectively and electrically connected to different sliding contact heads (132) of the other sliding contact assembly (130), and in a natural state, each sliding contact head (132) keeps an electric disconnection state; the pushing device (150) is used for driving the sliding block contacts (132) of the sliding contact assembly (130) to move so that the sliding block contacts (132) are electrically connected or disconnected, the pushing device (150) comprises a lifting mechanism (153), the sliding block contacts (132) of the sliding contact assembly (130) are arranged at intervals along the height direction, and when the lifting mechanism (153) performs lifting action, the sliding block contacts (132) are pushed to be electrically connected or disconnected.
  2. 2. The transformer testing device according to claim 1, wherein the buss bar copper assembly (120) comprises: a copper bar support device (122); The plurality of bus copper bars (121), each bus copper bar (121) is arranged on the copper bar supporting device (122) at intervals through corresponding insulating supports, and at least two bus copper bars (121) are electrically connected to two different slider contacts (132) of the sliding contact assembly (130).
  3. 3. The transformer test device of claim 2, wherein one or more of the buss bars (121) of the buss bar assembly (120) are electrically connected to one of the slider contacts (132) of the slider contact assembly (130).
  4. 4. The transformer testing device according to claim 2, wherein the pushing device (150) comprises: and a driving device (151), wherein the driving device (151) is used for driving the lifting mechanism (153) to do lifting motion.
  5. 5. The transformer testing device according to claim 4, wherein the sliding contact assembly (130) further comprises a first elastic member (131), the first elastic member (131) being disposed between the lifting mechanism (153) and the slider contact (132) of the lowest side of the sliding contact assembly (130).
  6. 6. The transformer test device according to claim 5, wherein the slider assembly (130) further comprises a sliding guide bar (133), each slider contact (132) is slidably fitted on the sliding guide bar (133), and a stopper for restricting a lower limit position of an upper slider contact, which is the slider contact (132) other than the slider contact (132) located at the lowermost side, is provided on the sliding guide bar (133).
  7. 7. The transformer testing device according to claim 6, wherein the sliding contact assembly (130) further comprises a second elastic member (134) sleeved on the sliding guide rod (133) and positioned below the uppermost sliding contact (132).
  8. 8. The transformer test device according to claim 4, wherein the lifting mechanism (153) is a screw mechanism or a rack-and-pinion mechanism, the driving device (151) is a driving motor, the driving device (151) drives the rotating member of the lifting mechanism (153) to rotate through a transmission mechanism (152), and the moving member of the lifting mechanism (153) performs lifting motion.
  9. 9. The transformer test device according to claim 2, wherein the busbar assembly (120) comprises 4 of the busbars (121) and the slider assembly (130) comprises 5 of the slider contacts (132); The two bus bars (121) on the upper side of the first bus bar assembly (120) are electrically connected with the second slider contact (132) from top to bottom of the first slider contact assembly (130), and the two bus bars (121) on the lower side of the first bus bar assembly (120) are electrically connected with the fourth slider contact (132) from top to bottom of the first slider contact assembly (130); One bus bar copper (121) at the uppermost side of the second bus bar copper assembly (120) is respectively and electrically connected with a first sliding contact (132) from top to bottom of the two sliding contact assemblies (130), the two bus bar copper (121) at the middle of the second bus bar copper assembly (120) is respectively and electrically connected with a third sliding contact (132) from top to bottom of the two sliding contact assemblies (130), and one bus bar copper (121) at the lowermost side of the second bus bar copper assembly (120) is respectively and electrically connected with a fifth sliding contact (132) from top to bottom of the two sliding contact assemblies (130); The two bus bars (121) on the upper side of the third bus bar assembly (120) are electrically connected with the second slider contact (132) of the second slider assembly (130) from top to bottom, and the two bus bars (121) on the lower side of the third bus bar assembly (120) are electrically connected with the fourth slider contact (132) of the second slider assembly (130) from top to bottom.
  10. 10. The transformer testing device according to any one of claims 1-9, wherein the switching-on/off device (100) further comprises a base (110), and the busbar assembly (120), the sliding contact assembly (130), and the pushing device (150) are all disposed on the base (110).
  11. 11. The transformer testing device of claim 10, further comprising a mobile lifting platform (200), the mobile lifting platform (200) comprising: a walking chassis (204), the bottom of which is provided with a walking wheel (205); The shear type connecting rod mechanism (201) is arranged on the walking chassis (204), a lifting platform (206) is arranged at the upper part of the shear type connecting rod mechanism (201), and the base (110) is arranged on the lifting platform (206); And the lifting hydraulic cylinder (203) is used for driving the scissor-type link mechanism (201) to act so as to drive the lifting platform (206) to do lifting action.
  12. 12. The transformer testing device according to claim 11, characterized in that supporting feet (207) are provided on the walking chassis (204).
  13. 13. The transformer test device according to claim 12, wherein the mobile lifting platform (200) further comprises a tensioning wire rope (202), one end of the tensioning wire rope (202) is connected to the walking chassis (204) or the supporting foot (207), and the other end is connected to the lifting platform (206).

Description

Transformer test device Technical Field The invention relates to the technical field of transformer temperature rise tests, in particular to a transformer test device. Background In the liquid-immersed transformer temperature rise test, it is generally necessary to short-circuit the low-voltage side terminals of the transformer. When the temperature rise of the winding is measured, the resistance of the winding needs to be rapidly measured after the power supply is disconnected, and then the average temperature of the winding is obtained by deduction of the resistance. The resistance measurement is preferably carried out as soon as possible after the winding has been connected to the measuring device, and the national standard GB/T1094.2 suggests that the time from the disconnection of the power supply to the measurement of the first effective thermal resistance should not exceed 2 minutes for a transformer with a rated capacity of less than 100MVA, 3 minutes for a transformer with a rated capacity of not less than 100MVA to less than 500MVA, and 4 minutes for a transformer with a rated capacity of not less than 500 MVA. In the prior art, the transformer terminal short-circuit connection is usually performed by adopting a fastening piece connection mode, namely, the wiring copper bar is connected with the low-voltage side terminal of the transformer through the fastening piece, and the fastening piece is required to realize short circuit, so that long time is required for dismounting or mounting. In order to rapidly realize short circuit and open circuit, a mode of realizing short circuit connection of transformer terminals by using a disconnecting link also exists in the prior art, the disconnecting link is added on a circuit for shorting each low-voltage side terminal, and the opening and closing operation of the short circuit is realized by using the disconnecting link. The contact surface of the disconnecting link is usually in line contact, so that the contact surface is easy to wear during disconnecting link disconnection and disconnection, and the reliability of the contact surface is reduced. Therefore, how to reduce the abrasion to the contact surface and improve the switching reliability on the basis of realizing the rapid switching between the transformer terminals is a technical problem which needs to be solved by the technicians in the field at present. Disclosure of Invention In view of the above, an object of the present invention is to provide a transformer test apparatus capable of reducing abrasion to a contact surface and improving the switching reliability on the basis of realizing rapid switching between transformer terminals. In order to achieve the above object, the present invention provides the following technical solutions: a transformer test device, includes divide-shut brake device, divide-shut brake device includes: the three bus bar copper bar assemblies are respectively and electrically connected with the 3-phase sleeve wiring terminals of the transformer; The two sliding contact assemblies comprise a plurality of sliding contact heads which are in relative sliding fit, the sliding contact heads are arranged at intervals, a first bus bar copper assembly and a second bus bar copper assembly are respectively and electrically connected to different sliding contact heads of one sliding contact assembly, and a second bus bar copper assembly and a third bus bar copper assembly are respectively and electrically connected to different sliding contact heads of the other sliding contact assembly; and the pushing device is used for driving the sliding block contacts of the sliding contact assembly to move so as to enable the sliding block contacts to be electrically connected or disconnected. Optionally, in the above transformer test apparatus, the busbar assembly includes: A copper bar supporting device; the plurality of bus copper bars are arranged on the copper bar supporting device at intervals through corresponding insulating supports, and at least two bus copper bars are electrically connected to two different sliding block contacts of the sliding contact assembly. Optionally, in the above transformer test apparatus, one or more of the bus bars of the bus bar assembly are electrically connected to one of the slider contacts of the slider assembly. Optionally, in the above transformer test device, the pushing device includes: A driving device; the driving device is used for driving the jacking mechanism to do lifting motion, the sliding block contacts of the sliding contact assembly are arranged at intervals along the height direction, and when the jacking mechanism does lifting motion, the sliding block contacts are pushed to be electrically connected or disconnected. Optionally, in the above transformer test apparatus, the sliding contact assembly further includes a first elastic member disposed between the lifting mechanism and the slider contact on the lowermost side of the slid