35kV-level amorphous alloy dry-type transformer
By adopting an insulator support structure with grooved upper support plate and creepage groove in the 35kV amorphous dry-type transformer, the problem of poor ventilation of the core support structure was solved, achieving better heat dissipation and creepage distance, and improving the performance and safety of the transformer.
Patent Information
- Application Number
- CN202520385341.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-06
AI Technical Summary
Existing 35kV amorphous dry-type transformers have poor ventilation in their core support structure at high voltage levels, resulting in poor heat dissipation from the upper part of the windings and insufficient creepage distance, which affects transformer performance.
The structure employs an upper support plate with grooves and an insulator support structure with creepage grooves, combined with silicone and epoxy board insulation. The clamps are fixed to the iron core with bolts to enhance the support and insulation of the winding and the yoke, and increase the creepage distance.
It improves ventilation in the upper part of the winding, enhances heat dissipation, reduces partial discharge, and improves the performance and safety of the transformer.
Smart Images
Figure CN223828320U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of transformer, in particular to a 35kV non-crystalline alloy dry-type transformer. BACKGROUND
[0002] The 35kV non-crystalline dry-type transformer is air-insulated, and the yoke space span is large for the non-crystalline transformer at a high voltage level, and the non-crystalline strip is soft and needs to be supported to prevent the strip from being stressed. SUMMARY
[0003] The present application provides a 35kV non-crystalline alloy dry-type transformer which is simple in structure and convenient to use.
[0004] The present application is achieved by the following technical solutions:
[0005] The 35kV non-crystalline alloy dry-type transformer comprises a core, a low-voltage winding, an insulation cylinder and a high-voltage winding which are sequentially installed on the core from inside to outside, characterized in that: upper clamping pieces are installed on the left and right sides of the upper yoke of the core, and the upper yoke and the left and right upper clamping pieces are fixed together through bolts; the cross section of the upper clamping piece is L-shaped, an insulation pad is placed between the horizontal part of the upper clamping piece and the upper end of the winding, and the horizontal part of the upper clamping piece is screwed into a pressing nail to press the insulation pad tightly.
[0006] A plurality of support insulators are installed between the lower surface of the upper yoke of the core and the upper end of the winding, and an upper supporting plate is placed on the lower surface of the upper yoke; the support insulator is columnar and has a ring of creepage grooves on the surface; the surface of the upper supporting plate in contact with the yoke has a concave-convex groove, and a resin rod is embedded in the back of the upper supporting plate and inserted into the hole at the end of the support insulator to fix the support insulator and prevent displacement.
[0007] Further preferably, the outer side of the upper yoke of the core is wrapped with a silica gel plate for insulation and support of the non-crystalline core, and the outer side of the lower yoke of the core is wrapped with an epoxy plate for insulation and support of the non-crystalline core.
[0008] Further preferably, lower clamping pieces are installed on the left and right sides of the lower yoke of the core, and the lower yoke and the left and right lower clamping pieces are fixed together through bolts; the cross section of the lower clamping piece is inverted L-shaped, and an insulation pad is clamped between the horizontal part of the lower clamping piece and the lower end of the winding.
[0009] Further preferably, a triangular rib plate is connected between the horizontal part and the vertical part of the upper clamping piece; and a triangular rib plate is connected between the horizontal part and the vertical part of the lower clamping piece.
[0010] Further preferably, the support insulator is made of resin, and the upper support plate is made of epoxy plate.
[0011] The transformer core and winding are supported by the upper support plate with concave-convex grooves and the insulator with creepage grooves, so that the transformer is ensured to be energy-saving, safe and reliable in operation, and is mainly applied to the structure of 35kV non-crystalline alloy dry-type transformer.
[0012] The new structure supports the insulator by support, replaces the area with the point, effectively improves the ventilation effect of the upper winding, improves the heat dissipation condition of the iron yoke position, supports the insulator with the creepage groove, effectively increases the creepage distance between the winding and the iron yoke, reduces the partial discharge, and enhances the performance of the transformer. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is a front view schematic diagram of the transformer body of the utility model. Figure 2 、 Figure 3 It is a front view schematic diagram of the upper support plate. Figure 4 It is a support structure schematic diagram.
[0014] In the drawing: 1 silica gel plate, 2 upper support plate, 3 support insulator, 4 insulating pad, 5 epoxy plate, 6 non-crystalline iron core, 7 press nail, 8 low-voltage winding, 9 insulating cylinder, 10 high-voltage winding, 11 lower clamp, 12 rib plate, 13 resin rod. DETAILED DESCRIPTION
[0015] The drawing is one specific embodiment of the utility model.
[0016] The 35kV non-crystalline alloy dry-type transformer of the utility model comprises an iron core, a low-voltage winding, an insulating cylinder and a high-voltage winding which are sequentially installed on the iron core from inside to outside, upper clamps are installed on the left and right sides of the upper yoke of the iron core, and the upper yoke, the left and right upper clamps are fixed together through bolts; the cross section of the upper clamp is L-shaped, an insulating pad is placed between the horizontal part of the upper clamp and the upper end of the winding, and the horizontal part of the upper clamp is screwed into a press nail to press the insulating pad tightly.
[0017] A plurality of support insulators are installed between the lower surface of the upper yoke of the iron core and the upper end of the winding, and the lower surface of the upper yoke is provided with an upper support plate; the support insulator is columnar and has a ring of creepage grooves on the surface; the surface of the upper support plate in contact with the yoke is provided with concave-convex grooves, the back surface of the upper support plate is pre-buried with a resin rod, and the tail end of the resin rod is embedded in the hole at the end of the support insulator to fix the support insulator and prevent displacement.
[0018] The outer side of the upper yoke of the iron core is wrapped with a silica gel plate for insulation and support of the non-crystalline iron core, and the outer side of the lower yoke of the iron core is wrapped with an epoxy plate for insulation and support of the non-crystalline iron core.
[0019] The lower iron yoke is fixed together with the left and right lower clamping pieces through bolts; the cross section of the lower clamping piece is inverted L-shaped, and an insulating pad is clamped between the horizontal part of the lower clamping piece and the lower end of the winding.
[0020] The horizontal part and the vertical part of the upper clamping piece are connected with triangular rib plates; the horizontal part and the vertical part of the lower clamping piece are connected with triangular rib plates.
[0021] The support insulator is made of resin, and the upper support plate is also made of epoxy plate.
[0022] In the utility model, the support between the iron core and the winding is composed of the upper support plate with concave and convex grooves and the resin insulator with creepage groove; the resin rod is embedded in the hole of the resin support insulator, and is used for fixing the support insulator and preventing displacement.
[0023] It is proved by practice that the 35kV non-crystalline alloy dry-type transformer body structure can effectively improve the heat dissipation condition of the upper part of the winding and the position of the iron yoke; the support is made of the insulator with creepage groove, the creepage distance of the winding and the iron yoke can be increased, the partial discharge is reduced, and the performance of the transformer is improved.
[0024] The clamping piece and the winding support are provided with insulating pads; however, the lower iron yoke of the iron core is not supported to the winding; the upper iron yoke support is supported because of the distance between the iron core columns; the non-crystalline iron core is soft and cannot bear force, so the upper part needs to be supported.
Claims
1. A 35kV amorphous alloy dry-type transformer, comprising an iron core, and a low-voltage winding, an insulating cylinder, and a high-voltage winding sequentially mounted on the iron core from the inside out, characterized in that: Upper clamps are installed on the left and right sides of the upper yoke of the iron core, and the upper yoke and the left and right upper clamps are fixed together by bolts; the cross-section of the upper clamp is L-shaped, and an insulating pad is placed between the horizontal part of the upper clamp and the upper end of the winding. The horizontal part of the upper clamp is screwed into the pressure nail to press the insulating pad tightly. Several supporting insulators are installed between the lower surface of the upper yoke of the iron core and the upper end of the winding. An upper support plate is placed on the lower surface of the upper yoke. The supporting insulators are columnar with a series of creepage grooves on their surface. The side of the upper support plate that contacts the yoke has grooves. A resin rod is pre-embedded on the back of the upper support plate. The end of the resin rod is embedded in the hole at the end of the supporting insulator to fix the supporting insulator and prevent displacement.
2. The 35kV amorphous alloy dry-type transformer according to claim 1, characterized in that: The outer side of the upper yoke of the iron core is wrapped with a silicone plate for insulation and support of the amorphous iron core; the outer side of the lower yoke of the iron core is wrapped with an epoxy plate for insulation and support of the amorphous iron core.
3. The 35kV amorphous alloy dry-type transformer according to claim 1, characterized in that: Lower clamps are installed on the left and right sides of the lower yoke of the iron core, and the lower yoke and the left and right lower clamps are fixed together by bolts; the cross-section of the lower clamp is inverted L-shaped, and an insulating pad is sandwiched between the horizontal part of the lower clamp and the lower end of the winding.
4. The 35kV amorphous alloy dry-type transformer according to claim 1, characterized in that: A triangular rib connects the horizontal and vertical parts of the upper clamping member; a triangular rib connects the horizontal and vertical parts of the lower clamping member.
5. The 35kV amorphous alloy dry-type transformer according to claim 1, characterized in that: The supporting insulators are made of resin, and the upper support plate is also made of epoxy board.