CN211265245U - 35kV power transformer ware body insulation system and 35kV power transformer - Google Patents
35kV power transformer ware body insulation system and 35kV power transformer Download PDFInfo
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- CN211265245U CN211265245U CN202020271582.8U CN202020271582U CN211265245U CN 211265245 U CN211265245 U CN 211265245U CN 202020271582 U CN202020271582 U CN 202020271582U CN 211265245 U CN211265245 U CN 211265245U
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Abstract
The utility model discloses an insulation structure of a 35kV power transformer body, which comprises a low-voltage winding and a high-voltage winding; an insulation protection structure is arranged between the low-voltage winding and the high-voltage winding, the upper ends of the low-voltage winding and the high-voltage winding are provided with pressing plates, the lower ends of the low-voltage winding and the high-voltage winding are provided with bottom plates, and the pressing plates and the bottom plates are used for fixing the low-voltage winding and the high-voltage winding; the insulation protection structure is an insulation coaming, and the insulation coaming is parallel to the longitudinal sections of the low-voltage winding and the high-voltage winding; the lower surface of the pressure plate is provided with an annular groove at the position opposite to the insulating coaming, the groove width of the annular groove is 2 times of that of the insulating coaming, and the groove depth is 1/4 groove width; the minimum creep distance of the bottom of the annular groove relative to the insulating enclosing plate is 82 mm; the minimum creepage distance of the upper surface of the bottom plate relative to the lower surface is 88 mm; two turns of the high-voltage winding are wrapped by small angle rings. The utility model discloses reduce the main insulation distance, simplified insulation system, reduced manufacturing cost. The utility model discloses a 35KV power transformer has the utility model discloses a ware body insulation system.
Description
Technical Field
The utility model relates to a power transformer field especially relates to a 35kV power transformer ware body insulation system to and 35kV power transformer who has this ware body insulation system.
Background
In the lower end part insulation structure between high-low voltage windings of the current 35kV oil-immersed power transformer, the internal windings of the transformer mainly comprise two windings, namely a low-voltage winding and a high-voltage winding, the low-voltage winding and the high-voltage winding are arranged in sequence from inside to outside, the low-voltage winding and the high-voltage winding are positioned at adjacent positions, and the main insulation distance between the low-voltage winding and the high-voltage winding is determined by the insulation level of the high-voltage winding. The insulation level of the high-voltage winding is 200kV of full-wave impulse voltage and 85kV of short-time power frequency voltage. According to the insulation level, the existing main insulation distance between the high-voltage coil and the low-voltage coil is 18mm, and in order to deal with the insulation weak position of the end part of the low-voltage winding, large-angle rings playing an insulation role are arranged at the upper end part and the lower end part of the high-voltage coil; the low-voltage winding and the high-voltage winding are separated into a first oil duct on the outer diameter side of the low-voltage winding with the width of 6mm and a first oil duct on the inner diameter side of the high-voltage winding with the width of 7mm through an insulating cylinder with the thickness of 3mm (the other 2mm is a sleeving margin); in the existing structure, the main insulation structure between the high-voltage winding and the low-voltage winding is too complex, so that the manufacturing cost is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a 35kV power transformer ware body insulation system. The large-angle ring with the insulating function at the upper end part and the lower end part of the high-voltage winding is eliminated, the main insulating distance is reduced, the insulating structure is simplified, and the manufacturing cost is reduced. Correspondingly, the utility model also provides a 35KV power transformer who has ware body insulation system of the utility model.
To ware body insulation system, the utility model provides a following technical scheme: a35 kV power transformer body insulation structure comprises a low-voltage winding and a high-voltage winding; an insulation protection structure is arranged between the low-voltage winding and the high-voltage winding, the space between the low-voltage winding and the high-voltage winding is divided into a first oil duct on the outer diameter side of the low-voltage winding and a first oil duct on the inner diameter side of the high-voltage winding through the insulation protection structure, the upper ends of the low-voltage winding and the high-voltage winding are provided with pressing plates, the lower ends of the low-voltage winding and the high-voltage winding are provided with bottom plates, and the pressing plates and the bottom plates are used for fixing the low; the insulation protection structure is an insulation coaming, and the insulation coaming is parallel to the longitudinal sections of the low-voltage winding and the high-voltage winding; the lower surface of the pressure plate is provided with an annular groove at the position opposite to the insulating enclosing plate, the groove width of the annular groove is twice of that of the insulating enclosing plate, and the groove depth is 1/4 groove width; the minimum creepage distance of the groove bottom of the annular groove relative to the insulating enclosing plate is 82 mm; the minimum creep distance of the upper surface of the bottom plate relative to the lower surface is 88 mm; two turns of the high-voltage winding are wrapped by small angle rings. The groove width of the annular groove is 20mm, the groove depth is 5mm, and the width of the insulating enclosing plate is 10 mm.
As an optimization, in the insulation structure of the body of the 35kV power transformer, the small angle ring is formed by overlapping two by two N fan-shaped angle ring units, N is half of the number of coil stays of the low-voltage winding and the high-voltage winding, and the width of the overlapping position of the two fan-shaped angle ring units is at least 40 mm.
As an optimization, in the insulation structure of the body of the 35kV power transformer, the width of the joint of every two of the fan-shaped angle ring units is 40 mm.
Compared with the prior art, the utility model discloses a set up insulating bounding wall and set up the ring dress groove below the clamp plate to set up the groove width of annular groove into 20mm, the groove depth is 5mm, is 82mm with the minimum creep distance of the relative insulating bounding wall of tank bottom of annular groove simultaneously, and the minimum creep distance of the relative lower surface of upper surface of bottom plate is 88mm, sets up little angle ring at the terminal two-turn winding of high-voltage winding, the utility model discloses following beneficial effect has:
(1) the large-angle ring is cancelled, the manufacturing of the transformer body is facilitated, and the manufacturing cost is saved. For example, SZ11-20000/35 is taken as an example, the cost can be saved by 10 multiplied by 48 to 480 yuan per station by eliminating a large angle ring, and the cost can be saved by 300 to 800 yuan per station according to different capacity;
(2) meanwhile, the situation that the angle ring is not easy to insert under the condition of radial over-tolerance of the coil can be avoided;
(3) the utility model discloses a little angle ring structure is further simplified, further reduce cost.
To the transformer, the utility model provides a following technical scheme: 35kV power transformer, it has aforementioned the utility model discloses a 35kV power transformer ware body insulation system.
Preferably, in the 35kV power transformer, the annular groove has a groove width of 20mm, a groove depth of 5mm, and a width of the insulating surrounding plate is 10 mm.
As an optimization, in the aforementioned 35kV power transformer, the small angle ring is formed by overlapping N fan-shaped angle ring units two by two, where N is half of the number of coil stays of the low-voltage winding and the high-voltage winding, and the width of the overlapping portion of the fan-shaped angle ring units two by two is at least 40 mm. Furthermore, the width of the joint of every two of the fan-shaped angle ring units is 40 mm.
Compared with the prior art, the utility model discloses a 35kV power transformer has adopted aforementioned the utility model discloses a 35kV power transformer ware body insulation system has gained following profitable technological effect:
(1) the insulating structure of the transformer body cancels a large-angle ring, thereby facilitating the manufacture of the transformer body and saving the manufacturing cost. For example, SZ11-20000/35 is taken as an example, the cost can be saved by 10 multiplied by 48 to 480 yuan per station by eliminating a large angle ring, and the cost can be saved by 300 to 800 yuan per station according to different capacity;
(2) meanwhile, the situation that the angle ring is not easy to insert under the condition of radial over-tolerance of the coil can be avoided;
(3) the utility model discloses a little angle ring structure is further simplified, further reduce cost.
Drawings
Fig. 1 is a schematic view of the body insulation structure of the present invention;
fig. 2 is a top view of the structure of the small angle ring of fig. 1.
Detailed Description
The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.
The utility model discloses a 35kV power transformer has the utility model discloses a 35kV power transformer ware body insulation system. To 35kV power transformer body insulation structure, the utility model provides a following embodiment further explains.
Example 1. An insulation structure of a 35kV power transformer body is shown in figures 1 and 2 and comprises a low-voltage winding 6 and a high-voltage winding 3; be provided with insulating protection structure between low voltage winding 6 and the high voltage winding 3, separate into the first oil duct of 6 external diameter sides of low voltage winding and the first oil duct of 3 internal diameter sides of high voltage winding through insulating protection structure between with low voltage winding 6 and high voltage winding 3, low voltage winding 6 and high voltage winding 3's upper end is equipped with clamp plate 1, low voltage winding 6 and high voltage winding 3's lower extreme is equipped with bottom plate 5, clamp plate 1 and bottom plate 5 are used for fixed low voltage winding 6 and high voltage winding 3, its improvement point lies in:
the insulation protection structure is an insulation surrounding plate 2, the insulation surrounding plate 2 is parallel to the longitudinal sections of the low-voltage winding 6 and the high-voltage winding 3, and the width of the insulation surrounding plate 2 is 10 mm;
the lower surface of the pressure plate 1 is provided with an annular groove 11 at the position opposite to the insulating coaming 2, the groove width of the annular groove 11 is 20mm, and the groove depth is 5 mm;
the minimum creepage distance of the bottom of the annular groove 11 relative to the insulating enclosing plate 2 is 82 mm;
the minimum creepage distance of the upper surface of the bottom plate 5 relative to the lower surface is 88 mm;
two turns of the high-voltage winding 3 at the tail end are wrapped by small angle rings 4.
Example 2: the width of the annular groove 11 is 18mm, the depth of the groove is 5mm, and the width of the insulating coaming 2 is 9 mm.
Example 3: the width of the annular groove 11 is 21mm, the depth of the groove is 5mm, and the width of the insulating coaming 2 is 10.5mm
Example 4: the small angle ring 4 is formed by overlapping N fan-shaped angle ring units 40 in pairs, wherein N is half of the number of coil struts of the low-voltage winding 6 and the high-voltage winding 3, and the width of the overlapping part 41 of each fan-shaped angle ring unit is at least 40mm, preferably 40 mm.
The utility model discloses ware body insulation system's theory of operation: the utility model cancels the large-angle ring, which is convenient for the manufacture of the body and saves the manufacturing cost. Taking SZ11-20000/35 as an example, the cost can be saved by 10 × 48 to 480 yuan/station by eliminating a large angle ring, and the cost can be saved by 300 to 800 yuan/station according to different capacities; meanwhile, the condition that the angle ring is not easy to insert under the condition of radial over-tolerance of the coil can be avoided. The utility model discloses a little angle ring structure is further simplified, further reduce cost.
The description and applications of the present invention are illustrative and not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, without departing from the spirit and/or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the present invention.
Claims (8)
1. A35 kV power transformer body insulation structure comprises a low-voltage winding and a high-voltage winding; an insulation protection structure is arranged between the low-voltage winding and the high-voltage winding, the space between the low-voltage winding and the high-voltage winding is divided into a first oil duct on the outer diameter side of the low-voltage winding and a first oil duct on the inner diameter side of the high-voltage winding through the insulation protection structure, the upper ends of the low-voltage winding and the high-voltage winding are provided with pressing plates, the lower ends of the low-voltage winding and the high-voltage winding are provided with bottom plates, and the pressing plates and the bottom plates are used for fixing the low; the method is characterized in that:
the insulation protection structure is an insulation coaming, and the insulation coaming is parallel to the longitudinal sections of the low-voltage winding and the high-voltage winding;
the lower surface of the pressure plate is provided with an annular groove at the position opposite to the insulating coaming, the groove width of the annular groove is 2 times of that of the insulating coaming, and the groove depth is 1/4 groove width;
the minimum creepage distance of the groove bottom of the annular groove relative to the insulating enclosing plate is 82 mm;
the minimum creep distance of the upper surface of the bottom plate relative to the lower surface is 88 mm;
two turns of the high-voltage winding are wrapped by small angle rings.
2. The 35kV power transformer body insulation structure of claim 1, wherein: the groove width of the annular groove is 20mm, the groove depth is 5mm, and the width of the insulating enclosing plate is 10 mm.
3. The 35kV power transformer body insulation structure of claim 1 or 2, wherein: the small angle ring is formed by overlapping N fan-shaped angle ring units in pairs, N is half of the number of coil struts of the low-voltage winding and the high-voltage winding, and the width of the overlapping position of the fan-shaped angle ring units in pairs is at least 40 mm.
4. The 35kV power transformer body insulation structure of claim 3, wherein: the width of the joint of every two fan-shaped angle ring units is 40 mm.
5.35kV power transformer, its characterized in that: it has the 35kV power transformer body insulation structure of claim 1.
6. The 35kV power transformer of claim 5, wherein: the groove width of the annular groove is 20mm, the groove depth is 5mm, and the width of the insulating enclosing plate is 10 mm.
7. A35 kV power transformer according to claim 5 or 6, characterized in that: the small angle ring is formed by overlapping N fan-shaped angle ring units in pairs, N is half of the number of coil struts of the low-voltage winding and the high-voltage winding, and the width of the overlapping position of the fan-shaped angle ring units in pairs is at least 40 mm.
8. The 35kV power transformer of claim 7, wherein: the width of the joint of every two fan-shaped angle ring units is 40 mm.
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| CN202020271582.8U CN211265245U (en) | 2020-03-09 | 2020-03-09 | 35kV power transformer ware body insulation system and 35kV power transformer |
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| CN202020271582.8U CN211265245U (en) | 2020-03-09 | 2020-03-09 | 35kV power transformer ware body insulation system and 35kV power transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114360864A (en) * | 2021-12-01 | 2022-04-15 | 保定天威互感器有限公司 | Novel winding shielding structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114360864A (en) * | 2021-12-01 | 2022-04-15 | 保定天威互感器有限公司 | Novel winding shielding structure |
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