Outdoor two-element combined current and voltage transformer
By optimizing the structure and materials of outdoor two-element combined current and voltage transformers, the problems of short lifespan, high material consumption, and low safety in existing technologies have been solved, resulting in high-precision, low-cost, and easy-to-install outdoor current and voltage transformers.
Patent Information
- Application Number
- CN202520080253.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-14
AI Technical Summary
Existing outdoor current and voltage transformers have short lifespans, high material consumption, high equipment costs, low saturation ratios, low safety, and large size, making outdoor installation complex.
Design an outdoor two-element combined current and voltage transformer. It adopts a fully enclosed and fully insulated structure, uses a rolled silicon steel sheet core, optimizes the core shape and coil arrangement, increases the number of secondary turns to improve the saturation ratio, and uses epoxy resin casting with external silicone rubber composite insulation material and internal shielding treatment.
It improves the service life and safety of current transformers, reduces the cost of consumables and equipment, simplifies the installation process, enhances metering accuracy and safety, and is small in size and easy to install outdoors.
Smart Images
Figure CN223743445U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the field of current voltage transformers, and particularly relates to an outdoor two-component combined current voltage transformer. BACKGROUND
[0002] The use of current voltage transformers is relatively common in electronic devices, and the current voltage transformer can change high voltage into low voltage and large current into small current for measurement or protection system. The function thereof is mainly to change high voltage or large current into standard low voltage or standard small current in proportion. The outdoor combined current voltage transformer is a device used for measurement and protection in a power system, which can be installed on a pole or in a power transmission line outdoors. The design of such a transformer is usually adapted to harsh external environmental conditions, such as humidity, pollution, etc., so special insulating materials and technologies are usually used to ensure the reliability and stability thereof.
[0003] At present, with the rapid development of the national economy, the state grid construction is changing rapidly, and higher requirements are put forward for power grid quality, electric energy measurement and management. As one of the important and indispensable devices in the power grid, the requirements for voltage and current transformers are also higher and higher.
[0004] The prior art outdoor current voltage transformer has the problems of short service life, high material consumption, high equipment cost, low saturation multiple, low safety of the voltage transformer, large size and complex outdoor installation. SUMMARY
[0005] The application is proposed to solve the problems of the prior art current voltage transformer, such as short service life, high material consumption, high equipment cost, low saturation multiple, low safety of the voltage transformer, large size and difficult outdoor installation, and provides an outdoor two-component combined current voltage transformer, characterized by comprising a shell, a base arranged at the bottom of the shell, a first iron core, a second iron core, a third iron core, a fourth iron core, a first primary connection terminal, a first secondary coil arranged on the first iron core, a first primary coil and a second secondary coil arranged on the second iron core, a second primary coil and a fourth secondary coil arranged on the third iron core, and a third secondary coil arranged on the fourth iron core.
[0006] The first primary connection terminal is connected to the second primary connection terminal after passing through the first iron core and meeting the number of turns of the first primary connection terminal; the first primary connection terminal is connected to the first connection wire; the first connection wire is connected to the first primary coil; the first primary coil passes through the second iron core, meets the number of turns of the first primary coil, and is welded to the second connection wire of the first primary coil;
[0007] One end of the second connection wire is connected to the second primary coil, and the other end of the second connection wire is connected to the fifth primary connection terminal.
[0008] The second primary coil passes through the third iron core, and after meeting the number of turns of the second primary coil, the third connecting wire of the second primary coil is welded;
[0009] The third connecting wire is connected with the third primary connecting terminal; the third primary connecting terminal passes through the fourth iron core, and after meeting the number of turns of the third primary connecting terminal, the fourth primary connecting terminal is connected; the fifth primary connecting terminal is connected with the terminal M10.
[0010] According to the outdoor two-component combined current-voltage transformer, the cross-sectional shapes of the first iron core and the fourth iron core are the same, are circular ring shapes, are symmetrically distributed in the middle of the shell, and the axes of the two are parallel to each other.
[0011] According to the outdoor two-component combined current-voltage transformer, the cross-sectional shapes of the second iron core and the third iron core are the same, are rectangular ring shapes, are symmetrically distributed on the outer side of the shell, and the axes of the two are parallel to each other.
[0012] According to the outdoor two-component combined current-voltage transformer, the axes of the first iron core and the fourth iron core are perpendicular to the axes of the second iron core and the third iron core.
[0013] According to the outdoor two-component combined current-voltage transformer, the shell is a composite insulation structure of internal epoxy resin pouring and external silicone rubber.
[0014] According to the outdoor two-component combined current-voltage transformer, the first iron core, the second iron core, the third iron core and the fourth iron core are all coiled silicon steel sheet iron cores, are full-enclosed structures, and are internally shielded.
[0015] According to the outdoor two-component combined current-voltage transformer, the base is a strip structure with a U-shaped cross section, and screw holes are symmetrically arranged on the base.
[0016] The beneficial effects of the present application are as follows:
[0017] 1. The first iron core of the application is provided with a first secondary coil; the second iron core is provided with a first primary coil, a second secondary coil; the third iron core is provided with a second primary coil, a fourth secondary coil; the fourth iron core is provided with a third secondary coil, the cross-sectional shape of the first iron core and the fourth iron core is circular ring, and they are symmetrically distributed in the middle of the shell with their axes parallel to each other. The cross-sectional shape of the second iron core and the third iron core is the same, which is rectangular ring, and they are symmetrically distributed on the outer side of the shell with their axes parallel to each other. The axes of the first iron core and the fourth iron core are perpendicular to the axes of the second iron core and the third iron core. The inside of the shell is composed of the first secondary coil, the first primary coil, the second secondary coil, the second primary coil, the fourth secondary coil and the third secondary coil, which has small volume. Since the second secondary coil 11 is wound on the rectangular ring-shaped second iron core 12, and the fourth secondary coil 14 is wound on the rectangular ring-shaped third iron core 15, the number of secondary turns is increased, and the number of primary turns is increased accordingly, so that the saturation multiple of the second iron core 12 and the third iron core 15 is increased, the measurement accuracy is high, it is not easy to saturate, and the safety is improved.
[0018] 2. The application adopts a fully enclosed and fully insulated structure, and the inside is shielded, the first secondary coil, the first primary coil, the second secondary coil, the second primary coil, the fourth secondary coil, the third secondary coil, and the first iron core, the second iron core, the third iron core and the fourth iron core are enclosed in the shell. The first iron core, the second iron core, the third iron core and the fourth iron core adopt a rolled silicon steel sheet core. The fully insulated structure can withstand power frequency voltage and improve the service life. The utility model has low material consumption, low equipment cost, simple installation, and the current part precision level can reach 0.2s level, and the voltage part precision level can reach 0.2 level. BRIEF DESCRIPTION OF DRAWINGS
[0019] Fig. 1 It is a front view of an outdoor two-component combined current and voltage transformer of the application.
[0020] Fig. 2 It is a left view of an outdoor two-component combined current and voltage transformer of the application.
[0021] Fig. 3 It is a top view of an outdoor two-component combined current and voltage transformer of the application.
[0022] In the figure: 1 - first primary connection terminal, 2 - second primary connection terminal, 3 - first secondary coil, 4 - first iron core, 5 - third primary connection terminal, 6 - fourth primary connection terminal, 7 - third secondary coil, 8 - fourth iron core, 9 - fifth primary connection terminal, 10 - first primary coil, 11 - second secondary coil, 12 - second iron core, 13 - second primary coil, 14 - fourth secondary coil, 15 - third iron core, 16 - first connecting wire, 17 - second connecting wire, 18 - third connecting wire, 19 - secondary output terminal, 20 - shell, 21 - base. DETAILED DESCRIPTION
[0023] PREFERRED EMBODIMENT
[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without any creative effort fall within the scope of protection of the present application.
[0025] As Figs. 1 to 3 shown: in the embodiment, an outdoor two-component combined current-voltage transformer includes a shell 20; the bottom of the shell 20 is provided with a base 21; the shell 20 is provided with: a first iron core 4, a second iron core 12, a third iron core 15, a fourth iron core 8, and a first primary connection terminal 1; the first iron core 4 is wound with a first secondary coil 3; the second iron core 12 is wound with a first primary coil 10 and a second secondary coil 11; the third iron core 15 is wound with a second primary coil 13 and a fourth secondary coil 14; the fourth iron core 8 is wound with a third secondary coil 7.
[0026] The first primary connection terminal 1 is connected to the second primary connection terminal 2 after passing through the first iron core 4 and meeting the number of turns of the first primary connection terminal 1; the first primary connection terminal 1 is connected to the first connecting wire 16; the first connecting wire 16 is connected to the first primary coil 10; the first primary coil 10 passes through the second iron core 12 and is welded to the second connecting wire 17 of the first primary coil 10 after meeting the number of turns of the first primary coil 10.
[0027] One end of the second connecting wire 17 is connected to the second primary coil 13; the other end of the second connecting wire 17 is connected to the fifth primary connection terminal 9.
[0028] The second primary coil 13 passes through the third iron core 15 and is welded to the third connecting wire 18 of the second primary coil 13 after meeting the number of turns of the second primary coil 13.
[0029] The third connecting line 18 is connected with the third primary connecting terminal 5; the third primary connecting terminal 5 penetrates through the fourth iron core 8, and is connected with the fourth primary connecting terminal 6 after meeting the penetrating turns of the third primary connecting terminal 5; and the fifth primary connecting terminal 9 is led out from the terminal M10.
[0030] The first iron core 4 and the fourth iron core 8 have the same cross-sectional shape, are circular annular, are symmetrically distributed in the middle of the shell 20, and have parallel axes.
[0031] The second iron core 12 and the third iron core 15 have the same cross-sectional shape, are rectangular annular, are symmetrically distributed on the outer side of the shell 20, and have parallel axes.
[0032] The axes of the first iron core 4 and the fourth iron core 8 are perpendicular to the axes of the second iron core 12 and the third iron core 15.
[0033] The shell 20 has a composite insulation structure of epoxy resin pouring and external silicone rubber.
[0034] The first iron core 4, the second iron core 12, the third iron core 15 and the fourth iron core 8 are all rolled silicon steel sheet cores, have a fully-enclosed structure, and are internally shielded.
[0035] The base 12 has a U-shaped cross-section and is in a strip structure; and the base 12 is symmetrically provided with threaded holes.
[0036] In the embodiment, the outgoing lines of the first secondary coil 3, the second secondary coil 11, the third secondary coil 7 and the fourth secondary coil 14 are welded on the secondary outgoing line terminal 19; and according to the current-voltage transformer parameters determined by the customer, the identification of the secondary outgoing line terminal 19 is determined, and the terminal identification is clear and distinct for the customer to distinguish the windings and the wiring.
[0037] The first iron core 4, the second iron core 12, the third iron core 15 and the fourth iron core 8 are all rolled silicon steel sheet cores; the current part includes the first primary connecting terminal 1, the second primary connecting terminal 2, the first secondary coil 3, the first iron core 4, the third primary connecting terminal 5, the fourth primary connecting terminal 6, the third secondary coil 7 and the fourth iron core 8, and the precision level can reach 0.2s level; and the voltage part includes the fifth primary connecting terminal 9, the first primary coil 10, the second secondary coil 11, the second iron core 12, the second primary coil 13, the fourth secondary coil 14 and the third iron core 15, and the precision level can reach 0.2 level, and the precision level is high.
[0038] The embodiment adopts full-closed and full-insulation structure, has shielding treatment inside, has higher dirt resistance and corrosion resistance when used outdoors, and the partial discharge level meets international requirements, the first core 4, the second core 12, the third core 15, the fourth core 8 and the first secondary coil 3, the first primary coil 10, the second secondary coil 14, the second primary coil 13, the fourth secondary coil 14 and the third secondary coil 7 are enclosed inside the shell 20. The utility model discloses low consumables, and the equipment cost is low.
[0039] In the voltage part, the second secondary coil 11 is arranged on the rectangular ring-shaped second core 12, and the fourth secondary coil 14 is arranged on the rectangular ring-shaped third core 15, so that the number of secondary turns is increased compared with the number of primary turns, and the saturation multiple of the second core 12 and the third core 15 is improved. The mutual inductor generates overvoltage due to system reasons in system operation, and because the voltage mutual inductor has high saturation multiple and high measurement accuracy, it is not easy to saturate, and the safety is higher.
[0040] The shell 20 inside the embodiment only has the first secondary coil 3, the first primary coil 10, the second secondary coil 14, the second primary coil 13, the fourth secondary coil 14 and the third secondary coil 7, and the volume is small. Outdoor use is simple to install, and it is a safe, reliable and easy-to-install current and voltage mutual inductor.
[0041] The use range of the embodiment is suitable for outdoor pole use and national network measurement use.
[0042] The use environment of the embodiment is:
[0043] The load power factor cos is 0.8 (lagging) ;
[0044] The ambient temperature is between -40 DEG C and 50 DEG C;
[0045] The daily average temperature is not higher than 35 DEG C;
[0046] The altitude is not more than 3000m.
[0047] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.
Claims
1. An outdoor two-element combination current voltage transformer characterized by: The shell (20) is provided with a base (21) at the bottom; the shell (20) is provided with: a first iron core (4), a second iron core (12), a third iron core (15), a fourth iron core (8), a first primary connection terminal (1); the first iron core (4) is provided with a first secondary coil (3); the second iron core (12) is provided with a first primary coil (10) and a second secondary coil (11); the third iron core (15) is provided with a second primary coil (13) and a fourth secondary coil (14); the fourth iron core (8) is provided with a third secondary coil (7); The first primary connection terminal (1) is connected with the second primary connection terminal (2) after passing through the first iron core (4) and meeting the number of turns of the first primary connection terminal (1); the first primary connection terminal (1) is connected with the first connection line (16); the first connection line (16) is connected with the first primary coil (10); the first primary coil (10) passes through the second iron core (12), and the second connection line (17) of the first primary coil (10) is welded after meeting the number of turns of the first primary coil (10); One end of the second connection line (17) is connected with the second primary coil (13); the other end of the second connection line (17) is connected with the fifth primary connection terminal (9); The second primary coil (13) passes through the third iron core (15), and the third connection line (18) of the second primary coil (13) is welded after meeting the number of turns of the second primary coil (13); The third connection line (18) is connected with the third primary connection terminal (5); the third primary connection terminal (5) passes through the fourth iron core (8), and is connected with the fourth primary connection terminal (6) after meeting the number of turns of the third primary connection terminal (5); the fifth primary connection terminal (9) is connected with the terminal M10.
2. An outdoor two-element combination current and potential transformer according to claim 1, characterized in that: The cross-sectional shapes of the first iron core (4) and the fourth iron core (8) are the same, both are circular ring shapes, and are symmetrically distributed in the middle of the shell (20), and the axes of the two are parallel to each other.
3. An outdoor two-element combination current and potential transformer according to claim 1, characterized in that: The cross-sectional shapes of the second iron core (12) and the third iron core (15) are the same, both are rectangular ring shapes, and are symmetrically distributed on the outer side of the shell (20), and the axes of the two are parallel to each other.
4. An outdoor two-element combination current and potential transformer according to claim 1, characterized in that: The axes of the first iron core (4) and the fourth iron core (8) are perpendicular to the axes of the second iron core (12) and the third iron core (15).
5. An outdoor two-element combination current and potential transformer according to claim 1, characterized in that: The shell (20) is a composite insulation structure of internal epoxy resin pouring and external silicone rubber.
6. An outdoor two-element combination current and potential transformer according to claim 1, characterized in that: The first iron core (4), the second iron core (12), the third iron core (15) and the fourth iron core (8) are all coil type silicon steel sheet iron cores, which are fully enclosed structures and are internally shielded.
7. An outdoor two-element combination current and potential transformer according to claim 1, characterized in that: The base (21) is a strip structure with a U-shaped cross section, and the base (21) is symmetrically provided with threaded holes.