CN215265939U - Pressure protector for high-voltage self-healing capacitor - Google Patents
Pressure protector for high-voltage self-healing capacitor Download PDFInfo
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- CN215265939U CN215265939U CN202121569347.XU CN202121569347U CN215265939U CN 215265939 U CN215265939 U CN 215265939U CN 202121569347 U CN202121569347 U CN 202121569347U CN 215265939 U CN215265939 U CN 215265939U
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Abstract
The utility model discloses a high pressure self-healing is pressure protector for condenser, condenser comprise case shell, apron, heart, the resin of packing, pressure protector and binding post, and this pressure protector installs inside the condenser, and pressure protector mainly comprises fixing stud, protector casing, removal bolt subassembly, fixed electrode subassembly, removal electrode subassembly, a fixing bolt and spacing bolt. The utility model discloses simple structure, installation, convenient to use can solve the relay protection technological problem of self-healing capacitor internal fault, avoid the emergence of accident effectively, can satisfy the requirement of condenser safe operation.
Description
Technical Field
The utility model belongs to power capacitor makes the field, concretely relates to high pressure is pressure protector for self-healing condenser.
Background
The dry-type high-voltage self-healing parallel capacitor box is oil-free, can prevent medium weakness and damage caused by partial discharge by virtue of self-healing characteristics, can reliably operate, and is suitable for being installed in urban underground substations, indoor substations of large buildings and key fire-proof places.
The capacitor has a self-healing function for breakdown in a very small range caused by dielectric electrical weakness and partial discharge, so that the capacitor has certain fault protection capability and can operate under high electric field strength. When the capacitor is under the action of overhigh thermal stress and electric stress, the medium is accelerated to age to cause large-area breakdown and cannot be self-healed, the medium at the breakdown part is decomposed by electric arcs to generate a large amount of gas, so that the internal pressure of the capacitor is increased rapidly, the shell is often expanded, even burst is caused, and other equipment is possibly damaged. When the medium in the metallized self-healing capacitor element is broken down in a large area, the electrodes are mainly communicated by an electric arc, the short circuit is unstable, the electric arc resistance ratio is large, and the reflected capacitance change is not obvious, so that the false phenomena of small capacitance change and the like easily cause the fault signal to be annihilated although the capacitor has serious faults and risks of explosion, and the situation is different from the metallic short circuit of a foil capacitor, so that the difficulty is caused in the relay protection of the backup of the capacitor device. Therefore, relay protection of internal faults of the dry-type high-voltage self-healing parallel capacitor is an unsolved problem, and sensitive and reliable relay protection is important for safe operation of the capacitor.
At present, a low-voltage self-healing capacitor used in a power system with a voltage level of 1kV or below is usually protected by pressure, and the protection method mainly comprises the steps of breaking an internal current connecting sheet by deformation of a shell of the capacitor, so as to cut off a power supply and enable the capacitor to quit operation. However, the high-voltage parallel capacitor is applied to 6kV, 10kV and 35kV voltage levels, if the current connecting sheet is broken inside, the insulation distance of the fracture and the fracture shape cannot meet the requirement of isolating high voltage, the fracture can be re-ignited or re-penetrated, and the generated high-power overvoltage can damage electrical equipment in the system. Therefore, such a snap-off protection device is not suitable for use in a high-voltage self-healing parallel capacitor.
Document CN 107481856 a discloses a fault signal booster dedicated to a high-voltage self-healing capacitor, which is configured to operate only when a housing expands beyond a certain size, and is placed in the middle of the capacitor, and when a fault point of the high-voltage self-healing capacitor is located at four corners of the housing, the fault signal booster may delay its operation. In addition, the production efficiency of the high-voltage self-healing capacitor is influenced by the product structure.
In summary, due to the particularity of the material, structure and working principle of the dry-type high-voltage self-healing parallel capacitor, the protection of internal faults is a key technical problem to be solved for safe operation, in addition to the self-healing performance of the internal faults.
Disclosure of Invention
To the requirement of the internal fault relay protection of the parallel capacitor of the power system, the utility model provides a high pressure self-healing capacitor (hereinafter referred to as "condenser") is with pressure protector.
The utility model adopts the following technical proposal.
The utility model provides a high pressure self-healing is pressure protector for condenser, condenser comprise case shell, apron, heart, the resin of packing, pressure protector and binding post, and pressure protector installs inside the condenser.
The pressure protector mainly comprises a fixed stud, a protector shell, a movable plug pin assembly, a fixed electrode assembly, a movable electrode assembly, a first fixed bolt and a limiting bolt. The protector casing is L shape, and its middle part has the circular step groove of degree of depth 2mm, the cylindrical cavity of degree of depth 2mm in proper order, and circular step groove and protector casing surface have the breach of degree of depth 2mm, and it is total 4 vertical cylindrical through-holes all around, and its bottom has a U type groove and connects horizontal cylindrical through-hole, has 1 square hole between cavity and the horizontal cylindrical through-hole, and its material is polycarbonate to form integratively through the mould punching press. The movable bolt component comprises a circular ring, a spring tube, a stainless steel gasket, a bolt body and an epoxy gasket. The fixed electrode assembly comprises a fixed electrode body, a second fixing bolt and a fixed lead-out wire. The movable electrode assembly includes a movable electrode body, a movable electrode, an internal connection lead, a spring, a third fixing bolt, and a movable lead. One end of the fixing stud is welded with the cover plate, and the other end of the fixing stud is fixed in the longitudinal cylindrical through hole of the protector shell through a first fixing bolt. The ring and the cover plate of the movable bolt assembly are welded together and clamped in the circular step groove, the spring tube, the stainless steel gasket and the epoxy gasket of the movable bolt assembly are all in the cylindrical cavity of the protector shell, and the bolt body is inserted into the transverse cylindrical through hole of the protector shell through the square hole. The fixed leading-out wire of the fixed electrode component is connected with the capacitor wiring terminal, one end of the fixed electrode body is placed in a U-shaped groove of the protector shell, and the other end of the fixed electrode body is connected with one end of the transverse cylindrical through hole in a threaded fit mode. The movable electrode, the inner connecting lead and the spring of the movable electrode assembly are placed in the transverse cylindrical through hole, the movable electrode body part of the movable electrode assembly is placed in the transverse cylindrical through hole and is positioned through the limiting bolt, and the movable leading-out lead of the movable electrode assembly is connected with the capacitor wiring terminal.
The circular ring, the spring pipe and the stainless steel gasket of the movable bolt assembly are sequentially connected into a whole through welding, and the stainless steel gasket, the epoxy gasket and the bolt body are connected in a threaded fit mode and coated with a sealant. The material of the circular ring, the spring pipe and the stainless steel gasket is stainless steel. The bolt body is made of epoxy resin, the upper end of the bolt body is cylindrical, and the lower end of the bolt body is cuboid.
The fixed electrode body of the fixed electrode assembly is tightly connected with the fixed lead-out lead by a second fixing bolt. The fixed electrode body is made of brass, the upper end of the fixed electrode body is a cube, the middle of the fixed electrode body is a cylinder, and the bottom of the fixed electrode body is a cylinder with threads. The fixed lead-out wire adopts an insulated multi-strand tinned soft copper wire.
The movable electrode body of the movable electrode assembly, the inner connecting lead sleeved with the compression-shaped spring and the movable electrode are sequentially and tightly connected through a third fixing bolt, and the movable electrode body and the movable leading-out lead are also tightly connected through the third fixing bolt. The movable electrode material is brass. The moving electrode body is made of brass and is a T-shaped cylinder. The movable lead-out wire adopts insulated multi-strand tinned soft copper wires.
The fixing stud is made of stainless steel and is a cylinder with 8mm outer diameter and M6 inner diameter threads.
The first fixing bolt and the limiting bolt are both of an inner hexagonal structure, and threads M6 are formed in the first fixing bolt and the limiting bolt.
Under the normal operation condition of the capacitor, the movable electrode is blocked by the plug pin body in the transverse cylindrical through hole, a sufficient insulation distance is kept between the movable electrode and the corresponding fixed electrode body, the spring is compressed, and the pressure protector is in an open-circuit state. When the condenser breaks down, when condenser internal pressure gradually becomes the grow, the spring pipe that removes the bolt subassembly compresses gradually, and pressure makes the bolt body upwards move slowly, and when pressure reached a certain setting value, when the bottom of bolt body and square hole bottom just portion were held level, the spring will be released, and the drive removes the electrode rapidly and leans on to fixed electrode, and the pressure protector is the short circuit state.
The movable electrode and the fixed electrode body are respectively connected to two outlet terminals of the capacitor, so that a short circuit is formed between the terminals of the capacitor. The reliable short circuit of this metallicity can make the capacitor bank produce enough big unbalanced voltage or electric current, make the relay protection of backup can detect smoothly, and drive the circuit breaker action, thus the capacitor device of excision trouble prevents that the condenser from bursting and causing the accident.
The utility model has the advantages that: according to the material, the structure and the characteristics of the dry-type high-voltage self-healing parallel capacitor, the pressure protector can solve the technical problem of relay protection of internal faults of the self-healing capacitor and effectively avoid accidents.
The utility model discloses simple structure, installation, convenient to use can satisfy the requirement of condenser safe operation.
Drawings
Fig. 1 is a schematic diagram of the present invention implemented in a capacitor.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a schematic view of a fixing stud.
Fig. 4 is a schematic view of a protector housing.
Fig. 5 is a top view of fig. 4.
Fig. 6 is a schematic view of a moving latch assembly.
Fig. 7 is a schematic view of a stationary electrode assembly.
FIG. 8 is a schematic view of a moving electrode assembly.
Fig. 9 is a schematic view of a first fixing bolt.
Fig. 10 is a schematic view of a spacing bolt.
In the figure, 1-cabinet; 2-cover plate; 3-hearts; 4-a filled resin; 5-a pressure protector; 6-a wiring terminal;
51-a fixing stud; 52-a protector housing; 53-moving the latch assembly; 54-a stationary electrode assembly; 55-moving the electrode assembly; 56-first fixing bolt; 57-a limit bolt;
531-circular ring; 532-spring tube; 533-stainless steel gasket; 534-bolt body; 535-epoxy gasket;
541-a fixed electrode body; 542-second fixing bolt; 543-fixing a leading-out wire;
551-moving the electrode body; 552-a movable electrode; 553-inner connecting leads; 554-a spring; 555-a third fixing bolt; 556-moving the outgoing wires.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
In fig. 1 can be seen: the condenser comprises case shell (1), apron (2), core (3), resin (4) of filling, pressure protector (5) and binding post (6), and pressure protector installs inside the condenser, and fault signal intensifier (5) are connected with two binding post (6) of condenser.
It can be seen from FIGS. 2-10 that: the pressure protector (5) mainly comprises a fixed stud (51), a protector shell (52), a movable bolt component (53), a fixed electrode component (54), a movable electrode component (55), a first fixed bolt (56) and a limiting bolt (57);
the protector shell (52) is L-shaped, the middle part of the upper part of the protector shell is sequentially provided with a circular step groove with the depth of 2mm and a cylindrical cavity with the depth of 2mm, the outer surfaces of the circular step groove and the protector shell (52) are provided with a notch with the depth of 2mm, the periphery of the circular step groove and the protector shell is provided with 4 longitudinal cylindrical through holes, the bottom of the circular step groove is provided with a U-shaped groove and connected with a transverse cylindrical through hole, 1 square hole is arranged between the cavity and the transverse cylindrical through hole, the material of the square hole is polycarbonate, and the square hole and the transverse cylindrical through hole are punched into a whole through a die; the movable bolt assembly (53) comprises a circular ring (531), a spring tube (532), a stainless steel gasket (533), a bolt body (534) and an epoxy gasket (535); the fixed electrode assembly (54) comprises a fixed electrode body (541), a second fixed bolt (542) and a fixed lead-out wire (543); the movable electrode assembly (55) comprises a movable electrode body (551), a movable electrode (552), an internal connection lead (553), a spring (554), a third fixing bolt (555) and a movable lead-out lead (556);
one end of the fixing stud (51) is welded with the cover plate (2), and the other end of the fixing stud is fixed in a longitudinal cylindrical through hole of the protector shell (52) through a first fixing bolt (56); a circular ring (531) of the movable bolt assembly (53) and the cover plate (2) are welded together and clamped in the circular step groove, a spring tube (532), a stainless steel gasket (533) and an epoxy gasket (535) of the movable bolt assembly (53) are all in a cylindrical cavity of the protector shell (52), and the bolt body (534) is inserted into a transverse cylindrical through hole of the protector shell (52) through a square hole; a fixed lead-out wire (543) of the fixed electrode assembly (54) is connected with a capacitor wiring terminal (6), one end of a fixed electrode body (541) is placed in a U-shaped groove of the protector shell (52), and the other end of the fixed electrode body is in threaded fit connection with one end of the transverse cylindrical through hole; the movable electrode (552), the inner connecting lead (553) and the spring (554) of the movable electrode assembly (55) are placed in the transverse cylindrical through hole, the movable electrode body (551) of the movable electrode assembly (55) is partially placed in the transverse cylindrical through hole and positioned by the limit bolt (7), and the movable lead-out lead (556) of the movable electrode assembly (55) is connected with the capacitor terminal;
the ring (531), the spring pipe (532) and the stainless steel gasket (533) of the movable bolt assembly (53) are sequentially connected into a whole through welding, and the stainless steel gasket (533), the epoxy gasket (535) and the bolt body (534) are connected in a threaded fit mode and coated with sealing glue. The material of the circular ring (531), the spring tube (532) and the stainless steel gasket (533) is stainless steel. The bolt body (534) is made of epoxy resin, the upper end of the bolt body is cylindrical, and the lower end of the bolt body is cuboid;
the fixed electrode body 541 of the fixed electrode assembly 54 and the fixed lead 543 are fastened and connected by a second fixing bolt 542. The fixed electrode body (541) is made of brass, the upper end of the fixed electrode body is a cube, the middle of the fixed electrode body is a cylinder, and the bottom of the fixed electrode body is a cylinder with threads; the fixed lead-out wire (543) adopts insulated multi-strand tinned soft copper wires;
a moving electrode body (551) of the moving electrode assembly (55), an internal connecting lead (553) sleeved with a compression-shaped spring (554) and the moving electrode (552) are sequentially and tightly connected through a third fixing bolt (555), and the moving electrode body (551) and a moving lead-out lead (556) are also tightly connected through the third fixing bolt (555); the material of the movable electrode (552) is brass; the movable electrode body (551) is made of brass and is a T-shaped cylinder. The movable lead-out wire (556) adopts insulated multi-strand tinned soft copper wires.
The fixing stud (1) is made of stainless steel and is a cylinder with an outer diameter of 8mm and an inner diameter of M6 threads.
The first fixing bolt (6) and the limiting bolt (7) both adopt an inner hexagonal structure with a thread M6.
Under the normal operation condition of the capacitor, the movable electrode (552) is blocked by the pin body (534) in the transverse cylindrical through hole, a sufficient insulation distance is kept between the movable electrode and the corresponding fixed electrode body (541), the spring (554) is compressed, and the pressure protector (5) is in an open circuit state. When the capacitor breaks down and the pressure in the capacitor is gradually increased, the spring tube (532) of the movable plug pin assembly (53) is gradually compressed, the pressure enables the plug pin body (534) to move upwards and slowly, when the pressure reaches a certain set value, the bottom of the plug pin body (534) is just level with the bottom of the square hole, the spring (554) is released, the movable electrode (552) is rapidly driven to lean against the fixed electrode (54), and the pressure protector (5) is in a short circuit state.
Since the movable electrode assembly (55) and the fixed electrode assembly (54) are respectively connected to two terminals (6) of the capacitor, a short circuit is formed between the terminals of the capacitor. The reliable short circuit of this metallicity can make the capacitor bank produce enough big unbalanced voltage or electric current, make the relay protection of backup can detect smoothly, and drive the circuit breaker action, thus the capacitor device of excision trouble prevents that the condenser from bursting and causing the accident.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a pressure protector for high pressure self-healing capacitor, pressure protector installs inside high pressure self-healing capacitor, pressure protector's characterized in that: the pressure protector mainly comprises a fixed stud, a protector shell, a movable plug pin assembly, a fixed electrode assembly, a movable electrode assembly, a first fixed bolt and a limiting bolt; the protector is characterized in that the protector shell is L-shaped, the middle part of the upper part of the protector shell is sequentially provided with a circular step groove with the depth of 2mm and a cylindrical cavity with the depth of 2mm, the outer surfaces of the circular step groove and the protector shell are provided with notches with the depth of 2mm, the periphery of the circular step groove and the protector shell is provided with 4 longitudinal cylindrical through holes, the bottom of the circular step groove is provided with a U-shaped groove and connected with a transverse cylindrical through hole, 1 square hole is arranged between the cavity and the transverse cylindrical through hole, the material of the square hole is polycarbonate, and the square hole and the transverse cylindrical through hole are punched into a whole through a die; the movable bolt component comprises a circular ring, a spring pipe, a stainless steel gasket, a bolt body and an epoxy gasket; the fixed electrode assembly comprises a fixed electrode body, a second fixed bolt and a fixed lead-out wire; the movable electrode assembly comprises a movable electrode body, a movable electrode, an internal connecting lead, a spring, a third fixing bolt and a movable leading-out lead; one end of the fixing stud is welded with the cover plate, and the other end of the fixing stud is fixed in the longitudinal cylindrical through hole of the protector shell through a first fixing bolt; the circular ring and the cover plate of the movable plug pin assembly are welded together and clamped in the circular step groove, the spring tube, the stainless steel gasket and the epoxy gasket of the movable plug pin assembly are all in the cylindrical cavity of the protector shell, and the plug pin body is inserted into the transverse cylindrical through hole of the protector shell through the square hole; a fixed lead-out wire of the fixed electrode assembly is connected with a capacitor wiring terminal, one end of a fixed electrode body of the fixed electrode assembly is placed in a U-shaped groove of the protector shell, and the other end of the fixed electrode body is in threaded fit connection with one end of the transverse cylindrical through hole; the movable electrode, the inner connecting lead and the spring of the movable electrode assembly are placed in the transverse cylindrical through hole, the movable electrode body part of the movable electrode assembly is placed in the transverse cylindrical through hole and is positioned through the limiting bolt, and the movable leading-out lead of the movable electrode assembly is connected with the capacitor wiring terminal.
2. The pressure protector for the high-voltage self-healing capacitor according to claim 1, wherein: the circular ring, the spring pipe and the stainless steel gasket of the movable bolt component are sequentially welded into a whole, and the stainless steel gasket, the epoxy gasket and the bolt body are connected in a threaded fit manner and coated with a sealant; the circular ring, the spring tube and the stainless steel gasket are made of stainless steel; the bolt body is made of epoxy resin, the upper end of the bolt body is cylindrical, and the lower end of the bolt body is cuboid.
3. The pressure protector for the high-voltage self-healing capacitor according to claim 1, wherein: the fixed electrode body of the fixed electrode assembly is fixedly connected with the fixed lead-out lead by a second fixed bolt; the fixed electrode body is made of brass, the upper end of the fixed electrode body is a cube, the middle of the fixed electrode body is a cylinder, and the bottom of the fixed electrode body is a cylinder with threads; the fixed lead-out wire adopts an insulated multi-strand tinned soft copper wire.
4. The pressure protector for the high-voltage self-healing capacitor according to claim 1, wherein: the movable electrode body of the movable electrode assembly, the inner connecting lead sheathed with the compression-shaped spring and the movable electrode are fastened and connected through a third fixing bolt in sequence, and the movable electrode body and the movable leading-out lead are also fastened and connected through the third fixing bolt; the movable electrode material is brass; the moving electrode body is made of brass and is a T-shaped cylinder; the movable leading-out wire adopts an insulated multi-strand tinned soft copper wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121569347.XU CN215265939U (en) | 2021-07-12 | 2021-07-12 | Pressure protector for high-voltage self-healing capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121569347.XU CN215265939U (en) | 2021-07-12 | 2021-07-12 | Pressure protector for high-voltage self-healing capacitor |
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| CN215265939U true CN215265939U (en) | 2021-12-21 |
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| CN202121569347.XU Active CN215265939U (en) | 2021-07-12 | 2021-07-12 | Pressure protector for high-voltage self-healing capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113363074A (en) * | 2021-07-12 | 2021-09-07 | 无锡市电力滤波有限公司 | Pressure protector for high-voltage self-healing capacitor |
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2021
- 2021-07-12 CN CN202121569347.XU patent/CN215265939U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113363074A (en) * | 2021-07-12 | 2021-09-07 | 无锡市电力滤波有限公司 | Pressure protector for high-voltage self-healing capacitor |
| CN113363074B (en) * | 2021-07-12 | 2024-09-03 | 无锡市电力滤波有限公司 | Pressure protector for high-voltage self-healing capacitor |
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