CN216818076U - Transformer voltage regulation pin configuration based on vacuum switch - Google Patents
Transformer voltage regulation pin configuration based on vacuum switch Download PDFInfo
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- CN216818076U CN216818076U CN202122881485.8U CN202122881485U CN216818076U CN 216818076 U CN216818076 U CN 216818076U CN 202122881485 U CN202122881485 U CN 202122881485U CN 216818076 U CN216818076 U CN 216818076U
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Abstract
The utility model provides a transformer voltage-regulating lead structure based on a vacuum switch, which comprises a column I, a column II, the vacuum switch, a first voltage-regulating coil and a second voltage-regulating coil, wherein the first voltage-regulating coil and the second voltage-regulating coil are respectively arranged on the column I and the column II, and the upper ends and the lower ends of the first voltage-regulating coil and the second voltage-regulating coil are respectively connected with the vacuum switch through a voltage-regulating lead. Compared with the prior art, the utility model discloses a can satisfy the switch and bear the weight of the electric current, have suitable insulation distance and reasonable insulating margin, and volume structure is less, has reduced production and cost of transportation.
Description
Technical Field
The utility model relates to the technical field of transformers, in particular to a transformer voltage-regulating lead structure based on a vacuum switch.
Background
The voltage regulation mode of the converter transformer in the current running and under-construction extra-high voltage direct current transmission project is on-load voltage regulation, the voltage regulation position is a network side neutral point, and the insulation level requirement of a voltage regulation lead is LI185AC95 kV. The converter transformer is generally of a two-column structure, the conventional structure of a voltage-regulating lead of the converter transformer is that two groups of oil-immersed on-load tap-changer are adopted, each group of on-load tap-changer is provided with two potential resistors, and each column of voltage-regulating lead is correspondingly connected with one group of on-load tap-changer respectively. Referring to fig. 1 and 2, the voltage regulating leads of two columns of the converter transformer are respectively led out from the upper part and the lower part of the voltage regulating coil, and the leads of the parallel part of the voltage regulating leads of the two columns are arranged in an upper layer and a lower layer, so that the insulation distance and the heat dissipation between the leads are ensured. And voltage regulating leads of the two columns respectively enter a group of oil-immersed on-load tap-changer to complete connection. And under the on-load tap-changer, the lower side beam of the iron core independently extends out of the bracket to support, and the result is the potential resistor configured by the switch.
Each column of voltage regulating lead of the conventional structure of the voltage regulating lead of the converter transformer is correspondingly connected with a group of on-load tap-changer respectively, so that the wiring principle is clear and the structure is simple. And the insulation distance between the voltage regulating leads and the surrounding structural members are completely met, and the reliability of the electrical performance is high. However, there are the following problems:
(1) each group of on-load tap-changer in the lead structure of the conventional converter transformer is provided with two potential resistors, and the potential resistors have larger volume and need to be supported by special brackets;
(2) in the lead structure of the conventional converter transformer, the distance between the return yoke in the long axis direction and the inner wall of the oil tank is large, and the using amount of transformer oil and steel is large;
(3) the insulation distance and the insulation margin in the conventional converter transformer lead structure are not reasonable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide a transformer voltage-regulating lead structure based on a vacuum switch, the utility model can meet the requirement of current bearing of the switch, has proper insulation distance and reasonable insulation margin, has smaller volume structure and reduces the production and transportation cost.
The purpose of the utility model can be realized by the following technical scheme:
the utility model provides a transformer voltage-regulating lead structure based on a vacuum switch, which comprises an I column, an II column, the vacuum switch, a first voltage-regulating coil and a second voltage-regulating coil, wherein the first voltage-regulating coil and the second voltage-regulating coil are respectively arranged on the I column and the II column, and the outlets of the upper end and the lower end of the first voltage-regulating coil and the second voltage-regulating coil are respectively connected with the vacuum switch through a voltage-regulating lead.
Preferably, the contacts at the upper end and the lower end of the first voltage regulating coil and the second voltage regulating coil are respectively connected with a voltage regulating lead in a cold pressure welding manner.
Preferably, the upper and lower ends of the first voltage regulating coil are connected with a first voltage regulating lead and a second voltage regulating lead respectively, and the first voltage regulating lead and the second voltage regulating lead are wired along a column side close to the vacuum switch and connected with the vacuum switch respectively.
Preferably, the outlet heads of the upper end and the lower end of the second voltage regulating coil are respectively connected with a third voltage regulating lead and a fourth voltage regulating lead, the fourth voltage regulating lead is connected with the third voltage regulating lead by winding to the upper end of the second voltage regulating coil along the side of a column far away from the vacuum switch, and is connected with the vacuum switch by routing along the tops of the I column and the II column.
Preferably, vacuum switch is equipped with upper tapping selector, lower floor's tapping selector, intermediate tap number terminal and current outflow end terminal, first pressure regulating lead and second pressure regulating lead are connected to upper tapping selector, third pressure regulating lead and fourth pressure regulating lead are connected to lower floor's tapping selector.
Preferably, the I post with II posts are equipped with first arrester and second arrester respectively, first arrester with the second arrester leads to vacuum switch respectively, first arrester and first pressure regulating lead wire and second pressure regulating lead wire all connect in upper shunting selector, the second arrester and third pressure regulating lead wire and fourth pressure regulating lead wire all connect in lower floor's shunting selector.
Preferably, the upper tapping selector and the lower tapping selector are respectively provided with a group of plate-type potential resistors, the head end of each group of plate-type potential resistors is connected with the middle tapping signal wiring terminal, and the tail end of each group of plate-type potential resistors is connected with the current outflow terminal wiring terminal.
Preferably, all the voltage regulating leads are 185mm2The electric density is 3.5A/mm2The lead cable of (1).
Preferably, an insulating clamping plate for insulation and heat dissipation is arranged between the adjacent voltage regulating leads.
Preferably, when the voltage regulating leads are parallel, the inner layer and the outer layer are distributed.
Compared with the prior art, the utility model has the following beneficial effects:
1. according to the vacuum switch designed by the utility model, the upper layer tapping selector and the lower layer tapping selector are respectively provided with the group of plate-type potential resistors, and the plate-type potential resistors are directly fixed on the vertical wire clamp, so that the structure is simpler and the operation is easier.
2. The vacuum switch-based transformer voltage regulating lead structure has the advantages that the size of the distance between the return yoke and the inner wall of the oil tank in the direction of the middle long axis is smaller, and the using amount of transformer oil and steel is saved to a certain extent.
3. According to the transformer voltage-regulating lead structure based on the vacuum switch, the inner layer and the outer layer are arranged when the voltage-regulating leads are parallel, so that the insulation distance and the heat dissipation between the adjacent voltage-regulating leads are ensured, and the insulation clamping plates for insulation and heat dissipation are arranged between the adjacent voltage-regulating leads, so that the transformer voltage-regulating lead structure meets the requirement of current bearing of the switch, and has a proper insulation distance and a reasonable insulation margin.
Drawings
FIG. 1 is a front view of a schematic diagram of a conventional construction of a voltage regulating lead of a converter transformer;
FIG. 2 is a top view of a schematic diagram of a conventional structure of a voltage regulating lead of a converter transformer;
FIG. 3 is a schematic top view of a voltage-regulating lead structure of the vacuum switch according to the present embodiment;
FIG. 4 is a front view of a schematic diagram of a voltage-regulating lead structure of a vacuum switch according to the present embodiment;
FIG. 5 is a left side view of a schematic diagram of a voltage-regulating lead structure of the vacuum switch according to the present embodiment;
FIG. 6 is a schematic diagram of the vacuum switch of the present embodiment based on the voltage-regulating lead structure of the vacuum switch;
FIG. 7 is a schematic diagram of the conventional construction of the voltage regulating leads of a converter transformer-the distance of the return yoke to the wall of the tank;
FIG. 8 is a schematic diagram of the vacuum switch-based pressure regulating lead structure-the distance from the return yoke to the wall of the tank;
labeled as: 11. i post, 12, II post, 21, first voltage regulating coil, 22, second voltage regulating coil, 3, vacuum switch, 41, first voltage regulating lead wire, 42, second voltage regulating lead wire, 43, third voltage regulating lead wire and 44, fourth voltage regulating lead wire.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Referring to fig. 3 and 4, the present embodiment provides a transformer voltage regulating lead structure based on a vacuum switch, including an I column 11, an ii column 12, a first voltage regulating coil 21, a second voltage regulating coil 22, a vacuum switch 3, a first voltage regulating lead 41, a second voltage regulating lead 42, a third voltage regulating lead 43 and a fourth voltage regulating lead 44.
The I column 11 and the II column 12 are respectively provided with a first pressure regulating coil 21 and a second pressure regulating coil 22 which are spiral, the upper end outlet and the lower end outlet of the first pressure regulating coil 21 are respectively connected with a first pressure regulating lead 41 and a second pressure regulating lead 42, and the first pressure regulating lead 41 and the second pressure regulating lead 42 are respectively wired and connected with the vacuum switch 3 through a three-way joint handle; the upper end of the second voltage regulating coil 22 is led out and the lower end is led out and is connected third voltage regulating lead 43 and fourth voltage regulating lead 44 respectively, and the fourth voltage regulating lead 44 winds to the upper end of the second voltage regulating coil 22 along a post side far away from the vacuum switch 3 upwards, is connected with the third voltage regulating lead 43, and walks along the top of I post 11 and II post 12 through the three-way union, is connected with the vacuum switch 3. When adjacent voltage regulating leads are parallel, an inner layer and an outer layer are arranged, so that the insulation distance and the heat dissipation between the adjacent voltage regulating leads are ensured. All voltage regulating leads are 185mm2The lead cable of (2) has an electrical density of about 3.5A/mm2And an insulating clamping plate for insulation and heat dissipation is arranged between the adjacent voltage regulating leads.
The neutral point lead wire adopts the form that bar copper and copper strand wires combine, and the rigidity bar copper is used for the centre gripping to guarantee mechanical properties, and the switch atress is prevented when the adjustment when the lead assembly of being convenient for of toughness copper strand wires and promotion switch. The steel plate has enough rigidity to ensure good stress and enough toughness to be easily adjusted during assembly.
And all the voltage regulating leads are vertically arranged, so that the space is saved.
Referring to fig. 6, the vacuum switch 3 is of VRG ii type from MR, germany, and the vacuum switch 3 is provided with an upper tap selector and a lower tap selector, wherein the upper tap selector is connected with a first voltage regulating lead 41 and a second voltage regulating lead 42, the lower tap selector is connected with a third voltage regulating lead 43 and a fourth voltage regulating lead 44, and all the voltage regulating leads respectively enter one layer of the vacuum switch 3 to complete connection. The I column 11 and the II column 12 are respectively provided with a first lightning arrester and a second lightning arrester which respectively pass through 50mm2Lead wire cable leadTo the vacuum switch 3, the first surge arrester is connected to the upper tap selector together with the first and second voltage regulating leads 41 and 42, and the second surge arrester is connected to the lower tap selector together with the third and fourth voltage regulating leads 43 and 44. Referring to fig. 5, the upper layer tapping selector and the lower layer tapping selector are respectively provided with a set of plate-type potential resistors, the plate-type potential resistors are directly fixed on the vertical wire clamp, the head end of each set of plate-type potential resistors is connected with the middle tapping signal wiring terminal of the vacuum switch 3, and the tail end of each set of potential resistors is connected with the current outflow terminal wiring terminal of the vacuum switch 3, so that the potential resistor function is completed.
Because the electric arc is extinguished in the sealed vacuum bubble in the switching process of the vacuum switch, the vacuum switch is different from an oil-immersed switch which takes insulating oil as an arc extinguishing medium, and compared with the oil-immersed switch, the vacuum switch has the following obvious advantages:
the contact has long service life. Compared with the vacuum interrupter in insulating oil, the vacuum interrupter only needs a small contact gap because the vacuum interrupter has better insulating property, so that the arc length is short, the arc extinguishing time is short, the contact abrasion is less, and the service life of the contact is greatly prolonged.
② oil-free carbonization. Because the arc is extinguished in the fully-closed vacuum interrupter during the vacuum switching process, the insulating oil in the switch is not needed to be directly used for extinguishing the arc, and the oil in the oil chamber of the tap switch cannot be carbonized, so that the reliability of arc extinguishing is improved.
And long maintenance interval. Due to the two advantages of the vacuum switch, the maintenance-free operation frequency is greatly improved to 30 ten thousand times compared with that of an oil immersed switch, the power failure time of the transformer and the maintenance cost are greatly reduced, the potential safety hazard in the maintenance process is reduced, the maintenance period is prolonged, and even the maintenance-free operation of the vacuum switch can be realized within the full period life of the transformer.
The assembly and wiring process of the transformer voltage-regulating lead structure based on the vacuum switch provided by the embodiment is as follows:
the lead wire assembly is carried out on the voltage regulating lead wire according to the designed voltage regulating lead wire structure, and firstly, the voltage regulating lead wire clamp is completely assembled on the device body according to the designed structure, wherein most of the wire clamps adopt the standardized design, 20mm thick laminated paper plates are selected, and through holes with the diameter of 22mm are drilled every 100mm, and M20 laminated wood insulating screw rods and insulating nuts are adopted for fastening the wire clamp. And assembling all voltage regulating lead cables to the wire clamp according to a designed structure for clamping, and completing the connection with the voltage regulating coil outlet, wherein the connection adopts cold pressure welding. The vacuum switch 3 is then assembled to the design position and the connection of the voltage regulating lead cable to the vacuum switch 3 is completed. The specific wiring process is as follows:
(1) lead wire preparation
And (4) checking and accepting the previous working procedure before starting work, and mainly checking whether the marks of the branch wires are complete or not.
Before wiring, drawing designers, process managers, quality specialists, general assembly workshop technicians, class leaders and backbones discuss and make wiring modes according to drawing and process related requirements, and follow-up products are wired strictly in a uniform mode.
(2) And measuring the levelness of the switch supporting plate by using a horizontal ruler, and measuring the height from the switch supporting plate to the bottom surface of the clamping piece by using a laser ruler to determine whether the requirements of a drawing are met.
(3) The vacuum switch 3 is hoisted on the switch supporting plate according to the drawing requirements, a special tool cushion block is manufactured according to the size of the switch supporting plate, and the vacuum switch 3 is temporarily cushioned by 15mm of lifting height and is consistent with the drawing size. The vacuum switch 3 is positioned according to the size from the center of the vacuum switch 3 to the center line of the body of the I-shaped column 11, and the vacuum switch 3 is fixed by bolts to prevent the switch from falling.
(4) The lead clamp is fixed on the corresponding limb plate of the clamp, the insulating screw and the nut are assembled and fixed without screwing, and the whole process is checked by reference to a drawing to confirm that the lead clamp is correct.
(5) The length of the pressure regulating lead is intercepted according to the length required by the drawing, the dust collector is started during the intercepting, and the lower part of the pressure regulating lead is simultaneously connected with the material receiving box.
(6) The length of the lead of the pressure regulating lead is measured, a certain radian is kept, so that the pressure regulating lead has enough expansion margin, and the vacuum switch 3 is prevented from being damaged due to stress. Each lead wire needs to have certain circular arc transition when turning, can not be folded into a right angle, and the bending radius must be larger than or equal to 30 mm.
(7) Arranging leads at the side of the vacuum switch 3 to ensure that each voltage regulating lead and an insulating column of the vacuum switch 3 have certain arc transition and cannot be bent into a right angle; the lead wires on the body sides of the I column 11 and the II column 12 are arranged, and the connecting part is arranged at the lower part of the lightning arrester.
(8) The bending part of the voltage regulating lead wire needs to be stripped of insulation, bound again, and half-overlapped in a single layer, so that no gap is ensured, and the binding is tight and smooth.
(9) The lightning arrester is not allowed to be directly contacted by hands in the assembling process, and gloves are required to be carried during installation and inspection. The lightning arrester needs to be arranged between the voltage-regulating lead poles, and the minimum insulation distance between the lightning arrester and the tapping lead is 150 mm. The number of the lightning arrester corresponds to the number of the voltage regulating lead wire one by one, and the connection mode adopts cold pressure welding.
(10) The transition resistance lead of the vacuum switch 3 is connected at the switch terminal position.
(11) The insulation distance is more than 25mm when the in-phase tap difference of the voltage regulating lead is more than 8 taps; the insulation distance between the dissimilar phase branch wires is larger than 40 mm.
(12) After the voltage regulating lead is connected, a special extra-high voltage pen is used for marking a tapping number on the surface of the voltage regulating lead. And each voltage regulating lead is not less than two marks.
(13) The neutral point lead is formed by cold-pressing a copper bar and a copper stranded wire, and the preparation position is positioned according to the size from the center of the lead to the center line of the I column 11.
(14) And a 15mm supporting cushion block on the switch bracket before the transformer body enters the tank is not removed.
(15) The terminal crimping position adopts semi-lap two-layer of semiconductor crepe paper (46# carbon black paper), and the distance between the starting end and the tail end of the semiconductor paper and the insulating layer is at least 10 mm.
The insulation distance of the transformer voltage-regulating lead structure based on the vacuum switch provided by the embodiment is shown in table 1:
| lead and corresponding electrode name | Minimum insulation distance (mm) |
| Branch connection line-box wall, oil tank aluminum shield, side column shield | 70 |
| Branch line-closed angle (R is more than or equal to 5mm) | 55 |
| Different-column wiring division: same/different number | 0/25 |
| Tapping on the same column: the number difference is less than or equal to 8/> 8 | 0/25 |
| Branch line-same pole switch contact: the number difference is less than or equal to 8/> 8 | 20/35 |
| Branch line-different |
35 |
| Branch line-lightning arrester | 150 |
| Net side tail-end-other tapping line | 60 |
| Arrester-box wall | 150 |
| Switch contact-box wall, side column shield | 100 |
Referring to fig. 7 and 8, in the conventional converter transformer lead structure, the dimension of the return yoke in the long axis direction from the inner wall of the oil tank is 1790mm, the dimension of the return yoke in the long axis direction from the inner wall of the oil tank of the transformer voltage-regulating lead structure based on the vacuum switch provided by the embodiment is 1260mm, the dimension of the converter transformer in the length direction is reduced by 520mm under the same condition, and the transformer oil and steel consumption is saved to a certain extent.
Each group of on-load tap-changer in the lead structure of the conventional converter transformer is provided with two potential resistors, and the potential resistors have large volume and need to be supported by a special bracket; the switch potential resistor in the transformer voltage-regulating lead structure based on the vacuum switch provided by the embodiment is of a plate type structure, is small in size, and can be fixed on a vertical wire clamp only, so that the structure is simple and the operation is easier.
Brackets for supporting two groups of on-load tap-changer are specially installed in the conventional converter transformer lead structure in measurement, the switch bracket has heavy weight and is difficult to assemble on site; according to the transformer voltage-regulating lead structure based on the vacuum switch, the switch bracket is directly welded on the side beam at the upper part of the iron core, and the structure is simple and easy to operate.
The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. The utility model provides a transformer pressure regulating pin configuration based on vacuum switch, its characterized in that includes I post (11), II post (12), vacuum switch (3) to and locate first voltage regulating coil (21) and second voltage regulating coil (22) on I post (11) and II post (12) respectively, first voltage regulating coil (21) with the play of the upper and lower end of second voltage regulating coil (22) respectively through connecting a voltage regulating lead wire with vacuum switch (3) are connected.
2. The transformer voltage-regulating lead structure based on the vacuum switch is characterized in that contacts at the upper end and the lower end of the first voltage-regulating coil (21) and the second voltage-regulating coil (22) are respectively connected with one voltage-regulating lead through cold pressure welding.
3. The transformer voltage-regulating lead structure based on the vacuum switch is characterized in that the outlet ends of the upper end and the lower end of the first voltage-regulating coil (21) are respectively connected with a first voltage-regulating lead (41) and a second voltage-regulating lead (42), and the first voltage-regulating lead (41) and the second voltage-regulating lead (42) are respectively routed along a column side close to the vacuum switch (3) and are connected with the vacuum switch (3).
4. The transformer voltage-regulating lead structure based on the vacuum switch is characterized in that the outlet heads of the upper end and the lower end of the second voltage-regulating coil (22) are respectively connected with a third voltage-regulating lead (43) and a fourth voltage-regulating lead (44), the fourth voltage-regulating lead (44) is connected with the third voltage-regulating lead (43) by winding the upper end of the second voltage-regulating coil (22) upwards along the side of a column far away from the vacuum switch (3), and is connected with the vacuum switch (3) by routing along the tops of an I column (11) and an II column (12).
5. The transformer voltage regulating lead structure based on the vacuum switch is characterized in that the vacuum switch (3) is provided with an upper layer tapping selector, a lower layer tapping selector, a middle tapping number binding post and a current outflow end binding post, the upper layer tapping selector is connected with a first voltage regulating lead (41) and a second voltage regulating lead (42), and the lower layer tapping selector is connected with a third voltage regulating lead (43) and a fourth voltage regulating lead (44).
6. The transformer voltage-regulating lead structure based on the vacuum switch is characterized in that the I column (11) and the II column (12) are respectively provided with a first lightning arrester and a second lightning arrester, the first lightning arrester and the second lightning arrester are respectively led to the vacuum switch (3), the first lightning arrester and a first voltage-regulating lead (41) and a second voltage-regulating lead (42) are both connected to an upper layer tapping selector, and the second lightning arrester and a third voltage-regulating lead (43) and a fourth voltage-regulating lead (44) are both connected to a lower layer tapping selector.
7. The transformer voltage-regulating lead structure based on the vacuum switch as claimed in claim 5, wherein the upper layer tapping selector and the lower layer tapping selector are respectively provided with a set of plate-type potential resistors, the head end of each set of plate-type potential resistor is connected with the middle tapping signal terminal, and the tail end of each set of plate-type potential resistor is connected with the current outlet terminal.
8. The transformer voltage-regulating lead structure based on the vacuum switch as claimed in claim 1, wherein all the voltage-regulating leads are 185mm in length2The electric density is 3.5A/mm2The lead cable of (1).
9. The transformer voltage-regulating lead structure based on the vacuum switch as claimed in claim 1, wherein an insulating clamping plate for insulation and heat dissipation is arranged between adjacent voltage-regulating leads.
10. The transformer voltage regulating lead structure based on the vacuum switch as claimed in claim 1, wherein when the voltage regulating leads are parallel, the inner layer and the outer layer are distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122881485.8U CN216818076U (en) | 2021-11-23 | 2021-11-23 | Transformer voltage regulation pin configuration based on vacuum switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122881485.8U CN216818076U (en) | 2021-11-23 | 2021-11-23 | Transformer voltage regulation pin configuration based on vacuum switch |
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| Publication Number | Publication Date |
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| CN216818076U true CN216818076U (en) | 2022-06-24 |
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| CN202122881485.8U Active CN216818076U (en) | 2021-11-23 | 2021-11-23 | Transformer voltage regulation pin configuration based on vacuum switch |
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2021
- 2021-11-23 CN CN202122881485.8U patent/CN216818076U/en active Active
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