CN-122025372-A - Epoxy casting dry-type transformer for mobile equipment and heat dissipation control method thereof

CN122025372ACN 122025372 ACN122025372 ACN 122025372ACN-122025372-A

Abstract

The invention discloses an epoxy casting dry type transformer for mobile equipment and a heat dissipation control method thereof, wherein the transformer comprises an iron core, a low-voltage winding, a high-voltage winding and an axial flow fan, the iron core is divided into two iron core sections along the stacking direction of the iron core, and a longitudinal iron core air passage with an axial through up and down is formed between the two iron core sections; the low-voltage winding is internally provided with an axially-through low-voltage longitudinal large air passage, the high-voltage winding is internally provided with an axially-through high-voltage longitudinal large air passage, the air outlet of the axial flow fan is arranged towards the lower end ports of the three groups of air passages, a forced air cooling heat dissipation structure with the cooperation of the iron core and the winding is formed, the transformer iron core and the winding are enabled to conduct overall high-efficiency heat dissipation, the temperature rise control capability of the transformer under the high-capacity working condition is improved, the problem that the heat dissipation efficiency is low due to the fact that the iron core is not provided with the through air passage, the winding air passage is unreasonable, and the air supply path deviation of the fan is caused in the prior art is solved, and the suitability and the operation reliability of the epoxy casting dry transformer in a prefabricated cabin type mobile transformer substation are remarkably improved.

Inventors

ZHANG KUI
GUO BAILIANG
DING YANG
Peng zhongshan
YUAN TAO
LIU WENSONG
XU YEPING
HUANGFU CHENCHEN
GENG JIAN
WANG ZHIGANG
DONG XIN
SUN XIAOHUI

Assignees

江苏宏源电气有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260127

Claims (10)

1. The epoxy casting dry type transformer for the mobile equipment comprises a three-phase three-limb iron core (1), a low-voltage winding (2), a high-voltage winding (3) and an axial flow fan (7), and is characterized in that the iron core (1) is divided into two split type iron core sections along the stacking direction of the iron core, a longitudinal iron core air passage (1 a) which is completely penetrated from top to bottom in the axial direction is formed between the two iron core sections, a low-voltage longitudinal large air passage (2 a) which is axially penetrated is arranged in the low-voltage winding (2), a high-voltage longitudinal large air passage (3 a) which is axially penetrated is arranged in the high-voltage winding (3), and an air outlet of the axial flow fan (7) is arranged towards the lower end ports of the low-voltage longitudinal large air passage (2 a), the high-voltage longitudinal large air passage (3 a) and the longitudinal iron core air passage (1 a).
2. The dry-type transformer according to claim 1, wherein the iron core (1) is formed by laminating ultra-low-loss silicon steel sheets, the section of the iron core (1) is of a multi-stage oblong structure, the lamination of the iron core (1) is fixed through a clamping and binding process, the iron core (1) is rigidly connected with the bottom leg (1 d) through a high-strength screw (1 b) and a steel clamping piece (1 c), and a shock pad (8) is arranged between the steel clamping piece (1 c) and the bottom leg (1 d).
3. The dry-type transformer according to claim 1, wherein the outer side wall of the iron core (1) is coated with an electrostatic shield (6), the electrostatic shield (6) is attached to the cylindrical surface of the iron core (1), and the electrostatic shield (6) is located in a gap between the iron core (1) and the low-voltage winding (2).
4. The dry-type transformer according to claim 1, wherein the low-voltage winding (2) and the high-voltage winding (3) are both of high-heat-conductivity filler modified epoxy resin vacuum pressure casting molding structures.
5. The dry-type transformer according to claim 1, further comprising an epoxy supporting plate (14) and a cushion block (4), wherein an insulating cylinder (5) is arranged between the low-voltage winding (2) and the iron core (1), the epoxy supporting plate (14) is arranged on the inner side and the outer side of the insulating cylinder (5) in the radial direction, the two sides of the epoxy supporting plate (14) are respectively abutted against the insulating cylinder (5) and the electrostatic screen (6) and the insulating cylinder (5) and the low-voltage winding (2), the cushion block (4) is arranged between the high-voltage winding (3) and the low-voltage winding (2) and between the low-voltage winding (2) and the insulating cylinder (5), a positioning boss is arranged on the cushion block (4) in the radial direction in a protruding mode, the insulating cylinder (5) is arranged between the iron core (1) and the low-voltage winding (2), the inner side wall of the insulating cylinder (5) is abutted against the electrostatic screen (6), the outer side wall of the insulating cylinder (5) is abutted against the inner side wall of the low-voltage winding (2), and the epoxy supporting plate (14) is abutted against the inner side wall of the insulating cylinder (5) in the radial direction respectively.
6. The dry-type transformer of claim 1, wherein the upper end face and the lower end face of the low-voltage winding (2) are fixedly provided with casting terminals (2 b), the casting terminals (2 b) are communicated with winding conductors of the low-voltage winding (2), the casting terminals (2 b) are connected with axially-led copper bars (2 c), and the axially-led copper bars (2 c) are axially extended along the transformer.
7. The dry-type transformer according to claim 1, further comprising a vacuum type on-load voltage regulating switch (10) and a prefabricated cabin bottom plate (9), wherein the on-load voltage regulating switch (10) is arranged on the high-voltage side of the transformer body, the on-load voltage regulating switch (10) and an outgoing line panel of the high-voltage winding (3) are oppositely arranged in parallel, the on-load voltage regulating switch (10) is communicated with a tapping panel (3 b) of the high-voltage winding (3) through a high-voltage silica gel cable (11), and the transformer body and the on-load voltage regulating switch (10) are both fixed on the prefabricated cabin bottom plate (9).
8. The dry-type transformer according to claim 5, wherein the lateral wall of the pad (4) is provided with a transverse groove, and the transverse groove extends along the length direction of the pad (4).
9. The dry-type transformer according to claim 1, wherein the three-dimensional collision recorder (13) is arranged on the upper clamping piece of the transformer, the intelligent temperature controller (12) is arranged on the transformer, the intelligent temperature controller (12) is connected with an optical fiber temperature sensor, the optical fiber temperature sensor is buried in the low-voltage winding (2) and the high-voltage winding (3), and the intelligent temperature controller (12) is electrically connected with the axial flow fan (7).
10. A heat dissipation control method of a dry-type transformer according to any one of claims 1 to 9, comprising the steps of: S1, acquiring temperature data of windings in real time through optical fiber temperature sensors embedded in the low-voltage winding (2) and the high-voltage winding (3); S2, the intelligent temperature controller (12) receives the temperature data and compares the temperature data with a preset temperature threshold; S3, according to a comparison result, the intelligent temperature controller (12) controls the start and stop or speed regulation of the axial flow fan (7) so as to regulate the flow of cooling air flowing through the longitudinal iron core air passage (1 a), the low-pressure longitudinal large air passage (2 a) and the high-pressure longitudinal large air passage (3 a).

Description

Epoxy casting dry-type transformer for mobile equipment and heat dissipation control method thereof Technical Field The invention relates to power equipment, in particular to an epoxy casting dry type transformer for mobile equipment and a heat dissipation control method thereof. Background The epoxy casting dry type transformer is widely applied to the field of prefabricated cabin type mobile transformer stations by virtue of the characteristics of safety, flame retardance, maintenance free and excellent insulating property, and becomes core power equipment in the emergency electricity-saving and load-transferring scene of a power grid, wherein the three-phase three-column iron core is matched with the structural form of a low-voltage winding and a high-voltage winding which are sleeved in a contract shaft, and is the main flow structural design of the dry type transformer, and meanwhile, the heat dissipation regulation and control of the transformer are realized by adopting a forced air cooling mode of an axial flow fan in the industry. In the prior art, the dry-type transformer has obvious defects that the heating value of an iron core and windings is greatly increased under the high-capacity moving working condition when the high-capacity moving transformer is operated, the iron core is of an integral laminated structure, a through-type radiating air passage is not arranged inside, heat exchange is carried out between the surface of the iron core and the outside only by means of the iron core, the radiating efficiency is limited, the air passage arrangement of a low-voltage winding and a high-voltage winding is of a scattered open pore form, the internal heat cannot be rapidly led out, a fan air outlet is only arranged towards the outer side of the transformer, the accurate and efficient air supply radiating effect cannot be formed between the inner side of the iron core and the air passage of the winding at the same time, the temperature rise control requirement of the high-capacity moving transformer is difficult to be adapted, meanwhile, the fastening assembly structure of the existing iron core is not optimized specially for the moving transport working condition, the situation of iron core lamination is easy to occur in the long-distance jolting and collision process, the problem of uneven distribution of an iron core outer electric field also causes a large insulation gap to be reserved between the iron core and the low-voltage winding, the whole volume of the transformer is further increased, the compact space of the transformer is difficult to be adapted to the compact space of the existing dry-type transformer, in addition, the existing dry-type transformer is fixed with a plurality of radial limit structures which lack of accurate, the high-precision air inlets cannot be arranged towards the outer side of the transformer, the outside the transformer is not easy to form a compact space, the accurate air passage is easy to form a large air passage, the air passage is easy to be connected with the air passage, the air passage is easy to form a large-condition is easy to be connected with the high-efficient air chamber, and has high-efficient air gap, and high-insulating space, and high-quality air space is easy to be easily separated, and easy to be easily, and a high Under the conditions of loose structure, insulation failure and unstable voltage regulation, the space utilization rate of the prefabricated cabin is difficult to promote, and the severe use requirements of the mobile substation on high power density, high shock resistance, high integration level and high reliability of the power equipment cannot be met. Disclosure of Invention The invention aims to provide the epoxy casting dry type transformer for the mobile equipment, which is adaptive to the moving working condition of the large-capacity prefabricated cabin, high in radiating efficiency, strong in structural stability and excellent in integration level. The technical scheme is that the epoxy casting dry type transformer for the mobile equipment comprises a three-phase three-limb iron core, a low-voltage winding, a high-voltage winding and an axial flow fan, wherein the iron core is divided into two split iron core sections along the stacking direction of the iron core, a longitudinal iron core air passage which is completely penetrated in the axial direction up and down is formed between the two iron core sections, the low-voltage winding is internally provided with a low-voltage longitudinal large air passage which is completely penetrated in the axial direction, the high-voltage winding is internally provided with a high-voltage longitudinal large air passage which is completely penetrated in the axial direction, and an air outlet of the axial flow fan is arranged towards the low-voltage longitudinal large air passage, the high-voltage longitudinal large air passage and the lower end port of the longitudinal iron core air pass