Rapid polarity-changing large-current partial-discharge-free silicon rectifier tube

Abstract

The utility model relates to the technical field of high-voltage direct-current generators and high-voltage silicon rectifiers, in particular to a rapid polarity-changing large-current partial-discharge-free silicon rectifier tube, which comprises an insulating shell, silicon discs uniformly distributed in the insulating shell, and voltage-sharing caps arranged at two ends of the insulating shell and used for sharing voltage of non-uniform electric fields at two ends of a silicon rectifier. The axis of the insulating shell is provided with a transmission rod capable of quickly changing polarity, and a hydraulic oil cylinder for driving the transmission rod to reciprocate is arranged in the voltage-sharing cap at one end. The silicon rectifier has the advantages that the silicon direct-current units are all sealed in the insulating shell body, the two ends of the silicon direct-current units adopt the aluminum voltage-sharing caps, the problem of uneven external electric field is effectively solved, the contact adopts the copper block and spring steel ball structure, the through-current problem and the problem of unstable polarity change are solved, and the silicon rectifier is more stable.

Description

Technical Field

[0001] This utility model relates to the technical field of high voltage DC generators and high voltage silicon rectifiers, specifically a fast-switching, high-current silicon rectifier tube without partial discharge. Background Technology

[0002] The DC high-voltage generator provides a DC high-voltage source and is specifically designed to detect the electrical insulation strength and leakage current of power devices. The intelligent DC high-voltage generator is a new-era product, newly researched, designed, and manufactured according to the requirements of the Chinese industry standard ZBF 24003-90 "General Technical Conditions for Portable DC High-Voltage Generators". It has multiple protection functions, such as: low-voltage overcurrent, low-voltage overvoltage, high-voltage overcurrent, high-voltage overvoltage, zero-position protection, and ungrounded protection. Fault sampling uses a dedicated sensor with a nanosecond-level action time. The optical isolation element is also nanosecond-level, and the action time is generally within 10 microseconds to completely shut off the DC main circuit, thus maximizing the protection of the instrument from damage.

[0003] Current DC high voltage generators have the following drawbacks: first, there is an uneven external electric field; second, the polarity is unstable. Utility Model Content

[0004] The purpose of this invention is to provide a fast-switching, high-current silicon rectifier without partial discharge, so as to solve the problems existing in the above-mentioned background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-current silicon rectifier with rapid polarity switching and no partial discharge, comprising an insulating shell 6, wherein silicon disks 5 are uniformly distributed inside the insulating shell 6, characterized in that: the insulating shell 6 is provided with equalizing caps 1 at both ends to equalize the non-uniform electric field at both ends of the silicon rectifier, and a transmission rod 7 capable of rapid polarity switching is provided at the axis of the insulating shell 6, wherein a hydraulic cylinder 2 for driving the transmission rod 7 to reciprocate is provided inside the equalizing cap 1 at one end.

[0006] Furthermore, the transmission rod 7 is composed of an insulating rod 8, an insulating block 9, and a conductive block 10. One end of the insulating rod 8 is provided with a connecting shaft 11 connected to the hydraulic cylinder 2. The circumference of the insulating rod 8 is provided with more than two grooves 14. The insulating block 9 and the conductive block 10 are alternately arranged in the grooves 14, and the arrangement order of the insulating block 9 and the conductive block 10 in different grooves 14 is opposite.

[0007] Furthermore, a spring 13 and a steel ball 12 are provided between the silicon disk 5 and the insulating block 9 and the conductive block 10. The steel ball 12 is attached to the insulating block 9 and the conductive block 10, and the spring 13 is located between the steel ball 12 and the silicon disk 5.

[0008] Furthermore, a silicon stack protection resistor 4 is provided between the silicon disk 5 and the voltage equalization cap 1. The silicon stack protection resistor 4 is located at both ends inside the insulating shell 6. The silicon stack protection resistor 4 is made of nickel-chromium wire and is wound on an epoxy glass fiber winding tube.

[0009] Furthermore, the equalizing cap 1 is provided with sealing plates 3 that fit into both ends of the insulating shell 6.

[0010] Furthermore, the silicon disk 5 is a small rectifier unit of the silicon rectifier, made of circuit boards and components, and each silicon disk 5 is equipped with an equalizing ring on the outermost side to improve the electric field strength.

[0011] Furthermore, the insulating outer shell 6 is made of glass fiber epoxy cylinder and is filled with insulating oil.

[0012] This utility model has the following beneficial effects: First, the silicon DC unit is completely enclosed in an insulating outer shell, and aluminum equalizing caps are used at both ends, which effectively solves the problem of uneven external electric field. Second, the contacts adopt a copper block and spring steel ball structure, which solves the problems of current flow and unstable polarity, making the silicon rectifier more stable. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 A schematic diagram of the structure of the transmission rod (7) in the middle;

[0015] Figure 3 yes Figure 1 A magnified view of a portion of K.

[0016] In the diagram: 1. Equalizing cap, 2. Hydraulic cylinder, 3. Sealing plate, 4. Silicon stack protection resistor, 5. Silicon disk, 6. Insulating shell, 7. Transmission rod, 8. Insulating rod, 9. Insulating block, 10. Conductive block, 11. Connecting shaft, 12. Steel ball, 13. Spring, 14. Groove. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-3This utility model provides a technical solution: a fast-changing polarity high-current silicon rectifier tube without partial discharge, including an insulating shell 6, and silicon disks 5 uniformly distributed inside the insulating shell 6. The silicon disks 5 are small rectifier units of the silicon rectifier, made of high-quality circuit boards and high-quality components. Each silicon disk 5 is equipped with an equalizing ring on the outermost side to shield the spikes on each silicon disk 5 and improve the electric field strength.

[0019] The insulating shell 6 is both the core component carrier and support of the silicon rectifier tube and the insulating medium (the carrier of transformer oil); the insulating shell 6 is made of high-strength glass fiber epoxy cylinder, which has excellent insulation and mechanical strength.

[0020] The insulating shell 6 has equalizing caps 1 at both ends to equalize the non-uniform electric field at both ends of the silicon rectifier. The caps are made of aluminum, which is simple to manufacture and lightweight, making them easy to install. Inside the equalizing caps 1 are sealing plates 3 that fit with both ends of the insulating shell 6. These sealing plates seal the insulating oil inside the rectifier tube and serve as fixing plates for installing and fixing the silicon rectifier. The sealing plates 3 are made of steel and have high strength.

[0021] A silicon stack protection resistor 4 is also provided between the silicon disk 5 and the voltage equalization cap 1. The silicon stack protection resistor 4 is located at both ends inside the insulating shell 6. The silicon stack protection resistor 4 is used to limit the overcurrent on the silicon rectifier in case of flashover of the test sample or other overvoltage during the test, and to protect the silicon rectifier from damage. The silicon stack protection resistor 4 is made of nickel-chromium wire wound on a high-strength epoxy glass fiber winding tube. It has the characteristics of large heat capacity and stable structure. At both ends of the entire silicon rectifier, the silicon stack protection resistor 4 is used as a protective resistor and can also be regarded as a shield and voltage equalization function for the extremely non-uniform electric field at both ends of the rectifier tube.

[0022] To achieve rapid polarity switching, a transmission rod 7 capable of quick polarity switching is located at the axis of the insulating shell 6. A hydraulic cylinder 2, which drives the transmission rod 7 to reciprocate, is located within an equalizing cap 1 at one end. The transmission rod 7 consists of an insulating rod 8, an insulating block 9, and a conductive block 10. One end of the insulating rod 8 has a connecting shaft 11 connected to the hydraulic cylinder 2. The circumference of the insulating rod 8 has more than two grooves 14. The insulating block 9 and the conductive block 10 are alternately arranged in the grooves 14, with the arrangement order of the insulating block 9 and the conductive block 10 in different grooves 14 being reversed. A spring 13 and a steel ball 12 are provided between the silicon disk 5 and the insulating block 9 and the conductive block 10. The steel ball 12 is in contact with the insulating block 9 and the conductive block 10, and the spring 13 is located between the steel ball 12 and the silicon disk 5. When the hydraulic cylinder 2 drives the transmission rod 7 to reciprocate, rapid polarity switching is achieved.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fast-recovery, high-current, non-partial-discharge silicon rectifier comprising an insulating envelope (6) uniformly filled with silicon discs (5), characterized in that: The insulating shell (6) is provided with voltage equalizing caps (1) at both ends, which can equalize the uneven electric field at both ends of the silicon rectifier, and the shaft center of the insulating shell (6) is provided with a transmission rod (7) capable of quickly changing polarity, and the voltage equalizing cap (1) at one end is provided with a hydraulic oil cylinder (2) capable of driving the transmission rod (7) to reciprocate.

2. A fast switching polarity-reversing high current silicon rectifier tube with no partial discharge according to claim 1, characterized in that: The transmission rod (7) is composed of an insulating rod (8), an insulating block (9) and a conductive block (10), one end of the insulating rod (8) is provided with a connecting shaft (11) connected with the hydraulic oil cylinder (2), the circumference of the insulating rod (8) is provided with grooves (14) more than two in number, and the insulating block (9) and the conductive block (10) are alternately arranged in the grooves (14) in sequence, and the arrangement sequence of the insulating block (9) and the conductive block (10) in different grooves (14) is opposite.

3. A fast switching polarity-reversing high current silicon rectifier tube with no partial discharge according to claim 2, characterized in that: The silicon disc (5) is provided with a spring (13) and a steel ball (12) between the insulating block (9) and the conductive block (10), the steel ball (12) is attached to the insulating block (9) and the conductive block (10), and the spring (13) is arranged between the steel ball (12) and the silicon disc (5).

4. A fast switching polarity-reversing high current silicon rectifier tube with no partial discharge according to claim 2, characterized in that: The silicon disc (5) is provided with a silicon stack protection resistor (4) between the voltage equalizing cap (1), the silicon stack protection resistor (4) is arranged at both ends inside the insulating shell (6), and the material of the silicon stack protection resistor (4) is nickel-chromium wire wound on an epoxy glass filament winding pipe.

5. A fast switching polarity-reversing high current silicon rectifier tube with no partial discharge according to claim 1, characterized in that: The voltage equalizing cap (1) is provided with a sealing plate (3) attached to both ends of the insulating shell (6).

6. A fast switching polarity-reversing high current silicon rectifier tube with no partial discharge according to claim 1, characterized in that: The silicon disc (5) is a small rectification unit of the silicon rectifier, and the material is a circuit board and components, and each silicon disc (5) is provided with a voltage equalizing ring at the outermost side to improve the electric field strength.

7. A fast switching polarity-reversing high current silicon rectifier tube with no partial discharge according to claim 1, characterized in that: The material of the insulating shell (6) is a glass filament epoxy cylinder, and the inside is filled with insulating oil.

Images