Outdoor 20-kilovolt lightweight voltage transformer
By using a rectangular iron core, epoxy resin cast housing, and cast aluminum junction box design, the problems of large size, heavy weight, and poor waterproof and corrosion resistance of outdoor 20 kV voltage transformers have been solved. This design achieves lightweight, waterproof, anti-theft, and high-precision metering capabilities, making it suitable for outdoor voltage transformers in complex environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN HUAYI ELECTRIC POWER & ELECTRIC APPLIANCE CO LTD
- Filing Date
- 2025-04-09
- Publication Date
- 2026-05-05
AI Technical Summary
Traditional outdoor 20 kV voltage transformers are bulky and heavy, lack waterproof and corrosion-resistant performance, have poor junction box sealing, affecting data accuracy and providing poor anti-theft protection, resulting in inconvenience in transportation and installation, and have a short service life in complex environments.
It features a rectangular iron core, an epoxy resin cast fully enclosed shell, a cast aluminum junction box, and a channel steel base. Combined with an IP55 protection rating seal and a steel wire lead sealing rope, it enhances waterproofing, corrosion resistance, and anti-theft properties. The use of cold-rolled silicon steel sheet iron core and hot-dip galvanizing treatment reduces weight and improves structural stability.
It achieves a lightweight design, improves waterproof, corrosion-resistant and anti-theft performance, ensures the accuracy and security of measurement data, adapts to harsh environments, extends service life and reduces material costs.
Smart Images
Figure CN224203946U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of voltage transformer technology, specifically relating to an outdoor 20 kV lightweight voltage transformer. Background Technology
[0002] Currently, outdoor 20 kV voltage transformers play a crucial role in voltage transformation and power metering in power systems.
[0003] However, traditional outdoor voltage transformers have significant drawbacks: First, their large size and heavy weight make transportation and installation inconvenient, especially in high-altitude or complex terrain environments. Second, their waterproof and corrosion-resistant properties are insufficient; long-term exposure to rain, snow, high humidity, or salt spray can easily cause internal component aging and decreased insulation performance, affecting their service life. Third, the junction box has poor sealing, allowing moisture to easily penetrate the secondary terminals, leading to increased measurement errors and affecting data accuracy. Fourth, their anti-theft features are weak; the junction box lacks effective protective structures, making it easy to be illegally disassembled or tampered with, threatening power supply safety. Furthermore, existing voltage transformers often use ordinary steel bases with insufficient anti-corrosion treatment, making them prone to rust after long-term use, further exacerbating structural stability issues. Therefore, there is an urgent need for a lightweight, highly protective, easy-to-install, and anti-theft outdoor voltage transformer to meet the comprehensive requirements of modern power grids for equipment reliability, safety, and economy. Summary of the Invention
[0004] To address the problems of existing technologies, such as large size and heavy weight, insufficient waterproof and corrosion resistance, poor junction box sealing, and poor data accuracy and anti-theft performance, this invention proposes an outdoor 20 kV lightweight voltage transformer. The outdoor 20 kV lightweight voltage transformer includes: a rectangular iron core on which a primary coil and a secondary coil are wound.
[0005] The iron core, primary coil, and secondary coil are encased in a fully enclosed shell formed by epoxy resin casting; a cast aluminum junction box is provided on the side of the shell.
[0006] The cast aluminum junction box is equipped with M6 secondary terminal bolts, M8N terminal bolts and M8 grounding bolts. The cast aluminum junction box is sealed with an IP55 protection rating.
[0007] A stainless steel waterproof connector is provided on one side of the cast aluminum junction box; the cast aluminum junction box is fixedly secured with a steel wire lead seal rope.
[0008] The bottom of the outer casing is connected to a channel steel base; an M8 base grounding bolt is installed on the channel steel base;
[0009] The primary coil is connected to the A-type connecting wire; the A-type connecting wire is connected to an M10 primary bolt.
[0010] The secondary coil is connected by N-phase connection lines, two secondary an-phase connection lines, a front ground connection line, and a rear ground connection line;
[0011] The front grounding connection wire and the rear grounding connection wire are respectively connected to the grounding bolt of the M8 base and the grounding bolt inside the box;
[0012] The N-phase connection wire is connected to the M8 N-terminal bolt. The secondary coil is connected to two secondary AN connection wires, which are connected to the M6 secondary terminal bolt. The pre-ground connection wire is connected to the M8 grounding bolt.
[0013] According to the above-described outdoor 20 kV lightweight voltage transformer, the core is made of cold-rolled silicon steel sheet.
[0014] According to the above-described outdoor 20 kV lightweight voltage transformer, the primary coil is connected to the A-term connection line and the N-term connection line via an M10 primary bolt.
[0015] According to the above-described outdoor 20 kV lightweight voltage transformer, the stainless steel waterproof connector has a specification of PG21.
[0016] According to the above-described outdoor 20 kV lightweight voltage transformer, the cast aluminum junction box is equipped with an M4 lead sealing screw.
[0017] According to the above-described outdoor 20 kV lightweight voltage transformer, the channel steel base is fixed to the ground by M8 bolts.
[0018] According to the above-described outdoor 20 kV lightweight voltage transformer, the surface of the channel steel base is treated with hot-dip galvanizing.
[0019] According to the above-described outdoor 20 kV lightweight voltage transformer, the epoxy resin shell has a casting thickness of 5-10 mm.
[0020] According to the above-described outdoor 20 kV lightweight voltage transformer, a silicone sealing ring is provided between the stainless steel waterproof connector and the cast aluminum junction box.
[0021] According to the above-described outdoor 20 kV lightweight voltage transformer, the diameter of the steel wire lead sealing rope is 3-5 mm, and both ends are equipped with anti-tamper lock buckles.
[0022] The beneficial effects of the present invention are as follows:
[0023] 1. The present invention uses a rectangular iron core to wind the coil, combined with epoxy resin casting molding process, which makes it lightweight and miniaturized, greatly reducing the size and weight, and making it easy to install and transport outdoors.
[0024] 2. The cast aluminum junction box of this invention adopts IP55 protection level sealed terminal port and connects to PG21 specification stainless steel waterproof connector, effectively isolating moisture and dust; the channel steel base is hot-dip galvanized, which significantly improves corrosion resistance, provides high protection, and is suitable for harsh environments from -40℃ to 45℃, better improving the stability of power supply voltage and providing reliable and accurate voltage data.
[0025] 3. The cast aluminum junction box of this invention is equipped with a steel wire lead-sealed rope locking structure on the outside, which enhances anti-theft and security, prevents unauthorized opening, and ensures the security of metering data.
[0026] 4. The primary and secondary coils of this invention are wound with clearly marked connecting wires and bolt interfaces, which reduces wiring errors, ensures accurate and stable metering, and improves the accuracy of voltage data acquisition.
[0027] 5. This invention adopts a cold-rolled silicon steel sheet core and a fully enclosed structure design, which reduces material costs while extending service life. It is economical and durable, and meets the requirements for long-term stable outdoor operation. Attached Figure Description
[0028] Figure 1 This is a sectional view of the front view of a structural schematic diagram of an outdoor 20 kV lightweight voltage transformer according to the present invention.
[0029] Figure 2 This is a cross-sectional view of the left view of a structural schematic diagram of an outdoor 20 kV lightweight voltage transformer according to the present invention.
[0030] Figure 3 This is a top view and a cross-sectional view of a structural schematic diagram of an outdoor 20 kV lightweight voltage transformer according to the present invention.
[0031] Figure 4 This is a front view of the structural schematic diagram of the cast aluminum junction box of an outdoor 20 kV lightweight voltage transformer according to the present invention.
[0032] Figure 5 This is a wiring diagram of an outdoor 20 kV lightweight voltage transformer according to the present invention.
[0033] In the diagram: 1-Cast aluminum junction box, 2-Iron core, 3-A-phase connection wire, 4-M10 primary bolt, 5-N-phase connection wire, 6-Secondary an-phase connection wire, 7-Front grounding connection wire, 8-M8 base grounding bolt, 9-Channel steel base, 10-Rear grounding connection wire, 11-M4 lead wire sealing screw, 12-M6 secondary terminal bolt, 13-Stainless steel waterproof connector, 14-M8 N-phase terminal bolt, 15-M8 grounding bolt, 100-Primary coil, 200-Secondary coil, 300-Outer shell, A-Primary coil A terminal, N-Primary coil N terminal, a-Secondary coil a terminal, n-Secondary coil n terminal. Detailed Implementation
[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0035] like Figures 1 to 4 As shown: An outdoor 20 kV lightweight voltage transformer includes: a rectangular iron core 2, on which a primary coil 100 and a secondary coil 200 are wound;
[0036] The iron core 2, the primary coil 100, and the secondary coil 200 are covered with a fully enclosed housing 300 formed by epoxy resin casting; a cast aluminum junction box 1 is provided on the side of the housing 300.
[0037] The cast aluminum junction box 1 is equipped with an M6 secondary terminal bolt 12, an M8N terminal bolt 14 and an M8 grounding bolt 15. The cast aluminum junction box 1 is sealed with an IP55 protection rating.
[0038] A stainless steel waterproof connector 13 is provided on one side of the cast aluminum junction box 1; a steel wire lead seal rope is fixedly installed on the outside of the cast aluminum junction box 1 for locking.
[0039] The bottom of the outer casing 300 is connected to a channel steel base 9; an M8 base grounding bolt 8 is provided on the channel steel base 9;
[0040] The primary coil 100 is connected to the A-type connecting wire 3; the A-type connecting wire 3 is connected to the M10 primary bolt 4;
[0041] The secondary coil 200 is connected to an N-phase connection line 5, two secondary an-phase connection lines 6, a front grounding connection line 7, and a rear grounding connection line 10.
[0042] The front grounding connection 7 and the rear grounding connection 10 are respectively connected to the M8 base grounding bolt 8 and the box-in-the-box grounding bolt 15;
[0043] The N-terminal connecting wire 5 is connected to the M8 N-terminal bolt 14. The secondary coil 200 is connected to two secondary an-terminal connecting wires 6, which are connected to the M6 secondary terminal bolt 12. The pre-grounding connecting wire 7 is connected to the M8 grounding bolt 8.
[0044] Core 2 is made of cold-rolled silicon steel sheet. The primary coil is connected to the A-term connecting wire 3 and the N-term connecting wire 5 via an M10 primary bolt 4. The stainless steel waterproof connector 13 is PG21.
[0045] The cast aluminum junction box 1 contains an M4 lead wire sealing screw 11. The channel steel base 9 is fixed to the ground with M8 bolts. The surface of the channel steel base 9 is treated with hot-dip galvanizing. The epoxy resin shell has a casting thickness of 5-10mm. A silicone sealing ring is provided between the stainless steel waterproof connector 13 and the cast aluminum junction box 1. The diameter of the steel wire lead sealing rope is 3-5mm, and both ends are equipped with anti-tamper locks. Detailed implementation method:
[0047] The specific implementation of an outdoor 20 kV lightweight voltage transformer according to the present invention is as follows:
[0048] An outdoor 20 kV lightweight voltage transformer consists of a rectangular iron core 2, a primary coil 100, a secondary coil 200, and an epoxy resin cast outer shell 300. The iron core 2 is made of cold-rolled silicon steel sheet. The primary coil 100 and the secondary coil 200 are wound in layers on the iron core 2. After winding, the accuracy is ensured by a turns test.
[0049] Junction Box and Sealing: The cast aluminum junction box 1 is fixedly mounted on the epoxy resin shell 300. Internally, it contains M6 secondary terminal bolts 12, M8N terminal bolts 14, and M8 grounding bolts 15. The cast aluminum junction box 1 is sealed with an IP55 protection rating. A PG21 stainless steel waterproof connector 13 is installed on one side of the junction box 1. A silicone sealing ring is embedded between the stainless steel waterproof connector 13 and the junction box 1 to ensure waterproofing. The outside of the junction box 1 is wrapped with 4mm diameter steel wire lead-sealed rope, with both ends secured by tamper-proof locks to prevent unauthorized opening.
[0050] Grounding and Installation: The channel steel base 9 is hot-dip galvanized and fixed to the ground by M8 base grounding bolts 8. The front grounding connection line 7 and the rear grounding connection line 10 are respectively connected to the M8 base grounding bolts 8 and M8 grounding bolts 15 to form double grounding protection.
[0051] Manufacturing process: After the primary coil 100 and secondary coil 200 are wound, the iron core 2 is placed in the mold, and epoxy resin is injected to form a fully enclosed outer shell 300 with a casting thickness of 8mm. After the resin cures, the cast aluminum junction box and waterproof connector are installed, and the internal leads are fixed with M4 lead sealing screws 11.
[0052] Application scenario: This invention is suitable for outdoor environments: -40℃~45℃. During installation, ensure the load power factor is within acceptable limits. Lag, frequency 50Hz, altitude <2000m. Its lightweight design reduces the total weight by 30% compared to traditional products, and its modular structure allows for quick installation on utility poles or substation supports, significantly improving construction efficiency.
[0053] Performance verification: After testing, the internal insulation resistance of this invention remained ≥100MΩ after 72 hours of operation in a rainstorm environment; no rust was observed after 1000 hours of salt spray testing; the anti-theft structure could withstand a 500N tensile force without loosening, meeting the requirements for long-term stable outdoor operation.
[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. An outdoor 20 kV lightweight voltage transformer, characterized in that, include: A rectangular iron core (2) on which a primary coil (100) and a secondary coil (200) are wound. The iron core (2), the primary coil (100) and the secondary coil (200) are covered with a fully enclosed shell (300) formed by epoxy resin casting; a cast aluminum junction box (1) is provided on the side of the shell (300). The cast aluminum junction box (1) is equipped with an M6 secondary terminal bolt (12), an M8 N terminal bolt (14) and an M8 grounding bolt (15), and the cast aluminum junction box (1) is sealed with an IP55 protection rating. A stainless steel waterproof connector (13) is provided on one side of the cast aluminum junction box (1); a steel wire lead seal rope is fixedly installed on the outside of the cast aluminum junction box (1) for locking. The bottom of the outer casing (300) is connected to a channel steel base (9); an M8 base grounding bolt (8) is provided on the channel steel base (9); The primary coil (100) is connected to the A-type connecting wire (3); the A-type connecting wire (3) is connected to the M10 primary bolt (4); The secondary coil (200) is connected to an N-term connection line (5), two secondary an connection lines (6), a front ground connection line (7), and a rear ground connection line (10). The front grounding connection line (7) and the rear grounding connection line (10) are respectively connected to the M8 base grounding bolt (8) and the M8 grounding bolt (15). The N-terminal connecting line (5) is connected to the M8 N-terminal bolt (14). The secondary coil (200) is connected to two secondary an-terminal connecting lines (6). The two secondary an-terminal connecting lines (6) are connected to the M6 secondary terminal bolt (12). The pre-grounding connecting line (7) is connected to the M8 grounding bolt (8).
2. The outdoor 20 kV lightweight voltage transformer according to claim 1, characterized in that, The core (2) is made of cold-rolled silicon steel sheet.
3. The outdoor 20 kV lightweight voltage transformer according to claim 2, characterized in that, The primary coil is connected to the A-term connecting line (3) and the N-term connecting line (5) by an M10 primary bolt (4).
4. The outdoor 20 kV lightweight voltage transformer according to claim 3, characterized in that, The stainless steel waterproof connector (13) is PG21.
5. An outdoor 20 kV lightweight voltage transformer according to claim 4, characterized in that, The cast aluminum junction box (1) is equipped with an M4 lead wire sealing screw (11).
6. The outdoor 20 kV lightweight voltage transformer according to claim 5, characterized in that, The channel steel base (9) is fixed to the ground by M8 bolts.
7. An outdoor 20 kV lightweight voltage transformer according to claim 6, characterized in that, The surface of the channel steel base (9) is treated with hot-dip galvanizing.
8. An outdoor 20 kV lightweight voltage transformer according to claim 7, characterized in that, The casting thickness of the outer shell (300) is 5-10 mm.
9. An outdoor 20 kV lightweight voltage transformer according to claim 8, characterized in that, A silicone sealing ring is provided between the stainless steel waterproof connector (13) and the cast aluminum junction box (1).
10. An outdoor 20 kV lightweight voltage transformer according to claim 9, characterized in that, The diameter of the steel wire lead seal rope is 3-5mm, and both ends are equipped with anti-tamper locks.