CN108615607B - Insulator fuse type high voltage-resistant capacitor - Google Patents
Insulator fuse type high voltage-resistant capacitor Download PDFInfo
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- CN108615607B CN108615607B CN201810298207.XA CN201810298207A CN108615607B CN 108615607 B CN108615607 B CN 108615607B CN 201810298207 A CN201810298207 A CN 201810298207A CN 108615607 B CN108615607 B CN 108615607B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
- H01G4/385—Single unit multiple capacitors, e.g. dual capacitor in one coil
Abstract
The invention provides an insulator fuse type high-voltage capacitor, wherein: the capacitor positive insulator assembly is connected with the positive electrode of the capacitor core component, the negative electrode of the capacitor core component is connected with the capacitor negative insulator, an internal discharger is arranged between the capacitor positive insulator assembly and the capacitor negative insulator, the discharger detection control device is connected with the internal discharger, and the discharger detection control device is connected with the DSP controller through a communication device; the positive insulator subassembly of condenser includes: the capacitor positive insulator, the fuse and the fuse detection control device; the fuse is arranged in the capacitor anode insulator, and the fuse detection control device is arranged on the capacitor anode insulator. The invention improves the high voltage resistance and overcurrent impact resistance of the capacitor, the monitoring function and the safety and controllability of the capacitor; the defects that the high-voltage capacitor is difficult to measure, cannot be controlled and is easy to damage are overcome; high pressure resistance, good high-frequency performance, small volume and heat, and long service life.
Description
Technical Field
The invention relates to the technical field of power electronics and high-voltage capacitor energy storage control, in particular to an insulator fuse type high-voltage capacitor.
Background
With the implementation of the high-speed development in China and the world development planning in China all the way, the yield of metals such as steel, iron, aluminum and the like in China is developed to be more than 50% of the world yield, and the development speed of a high-speed electric train railway is the first in the world. Due to the particularity of the electric railway and the metal smelting system, a large amount of higher harmonics and reactive power are generated, so that the power grid is greatly impacted and interfered, and the safety and stability of the power grid are seriously influenced. In order to compensate for harmonic waves and reactive power of a power grid, the power grid adopts a large number of high-voltage capacitors. Due to the problems and drawbacks of the existing capacitors, improving the performance of high voltage capacitors has become an important issue in modern power grids.
Through search, the following results are found:
1. the Chinese patent application with publication number CN103440936A is named as ceramic insulator and high-voltage power capacitor insulator device; the insulator device comprises a ceramic insulator body, a wiring assembly and a mounting assembly; the mounting assembly comprises a metal mounting seat and a sealing ring; the metal mounting seat is tubular, and the sealing ring is positioned between the lower surface of the annular positioning boss and the blocking part; the invention is convenient to install. But the performance of the capacitor is not improved, and the problems that the capacitor cannot be detected and is easy to damage still exist.
2. The patent application with publication number CN200947544, entitled "high voltage integrated adjustable capacitor type electric power reactive compensator", discloses a utility model adjustable capacitor type electric power reactive compensator, which is mainly applicable to reactive compensation and voltage adjustment in 10-35KV electric network. The compensator is divided into a fixed part and an adjustable part, a capacitor of the fixed part is a high-voltage capacitor, a capacitor of the adjustable part is a low-voltage capacitor, the regulation and control of the capacitor are realized by a combined switch, and the regulation and control are completed at low voltage, so that the impact on a power grid is small, and the structure is simple. Although the patent has small impact on a power grid, the problems of small adjustment range and easy damage of a high-voltage capacitor still exist.
3. The utility model discloses a chinese utility model patent application with publication number CN2687829, the name is "large capacity high voltage capacitor protection fuse", discloses a large capacity high voltage capacitor protection fuse, sets up the screw terminal at the fuse top as the fuse connector to adopt screw zonulae occludens with the screw of pipe cap and arc extinguishing pipe inner wall, the fuse connector and the pipe cap contact resistance of this kind of fuse are little, can not cause local overheat to arouse the fuse to break by mistake when passing through the heavy current, the difficult not hard up of arc extinguishing pipe drops. But the performance of the capacitor is not improved, and the problems that the capacitor cannot be detected and is easy to damage still exist.
At present, the national power grid, the tram, metal smelting system adopts compensation devices such as a large amount of condensers and reactive power compensation devices and LC filter, SVG, SVC for compensating power grid harmonic and reactive power, and these compensation devices constitute by high-voltage capacitor, and current high-voltage capacitor strikes greatly to the electric wire netting, easily produces the resonance, easily punctures short circuit and damage, cause very big hidden danger to the electric wire netting, consequently improve the high pressure resistant breakdown-resistant ability and the control and the protective capability of condenser, be the problem of treating the solution urgently in the present high-voltage power capacitor technique.
Disclosure of Invention
According to the particularity of national power grids, electric railways and metal smelting systems, the invention provides an insulator fuse type high-voltage-resistant capacitor aiming at the problems and the defects in the prior high-voltage capacitor technology.
In the design of the capacitor, the insulator and the fuse adopt an innovative combined structure, the fuse is arranged in the positive insulator of the capacitor, and the fuse detection control device is arranged on the positive insulator of the capacitor and is easy to replace and maintain; furthermore, the capacitor is also provided with a discharger and a discharger detection control device, and is also provided with a fusing display and a discharging display; furthermore, the capacitor core assembly adopts a high voltage-resistant structure, so that the overvoltage and current impact resistance of the capacitor is improved by more than 2-fold. Furthermore, signals and data of the fuse detection control device and signals and data of the discharger and the discharger detection control device are sent to the DSP controller by the communication device to monitor, regulate and control the high-voltage capacitor, and therefore the monitoring function and the high-voltage resistance strength of the capacitor are improved. The invention improves the controllability and the safety of various electric power equipment consisting of the capacitor; the problems that the existing high-voltage capacitor is difficult to measure and control and is easy to damage are thoroughly solved; the breakdown resistance and the breakdown prevention and short circuit protection capability of the capacitor are improved; the invention has good detection and control performance, strong high-pressure resistance and overcurrent impact resistance, small volume, good high-frequency performance and long service life; the device is suitable for various electric equipment such as electric trains, railways, metal smelting systems, national power grid harmonic and reactive power compensation and power frequency conversion devices and the like.
The invention is realized by the following technical scheme.
An insulator fuse type high-voltage capacitor comprises a capacitor anode insulator assembly, a capacitor cathode insulator, an internal discharger, a discharger detection control device, a capacitor core component, a communication device and a DSP controller; wherein:
the capacitor positive electrode insulator assembly is connected with the positive electrode of the capacitor core part, the negative electrode of the capacitor core part is connected with the capacitor negative electrode insulator, an internal discharger is arranged between the capacitor positive electrode insulator assembly and the capacitor negative electrode insulator, the discharger detection control device is connected with the internal discharger, and the discharger detection control device is connected with the DSP controller through a communication device;
the capacitor positive insulator assembly includes: the capacitor positive insulator, the fuse and the fuse detection control device; the fuse sets up inside the anodal insulator of condenser, fuse detection control device installs on the anodal insulator of condenser.
Preferably, the fuse includes a fuse body, an upper connecting member and a lower connecting member; the capacitor anode insulator comprises an insulating porcelain insulator, an upper screw, a lower screw, an upper fixing nut, a lower fixing nut, an upper sealing element, a lower sealing element, an upper sealing gasket, a lower sealing gasket, a detection device outer cover and an insulator fixing seat.
Preferably, the fuse main body is installed inside the porcelain insulator, the upper end of the fuse main body is connected with the inner end part of the upper screw rod through an upper connecting piece, and the outer end part of the upper screw rod is located outside the upper end of the porcelain insulator and is fixed through an upper fixing nut; the lower end of the fuse body is connected with the inner end part of the lower screw rod through a lower connecting piece, the outer end part of the lower screw rod is positioned outside the lower end of the porcelain insulator, and the insulator fixing seat is installed on the outer end part of the lower screw rod and is fixed through a lower fixing nut; the detection device outer cover is arranged between the insulator fixing seat and the insulating porcelain insulator, and the fuse detection control device is arranged in the detection device outer cover; an upper sealing element is arranged between the upper end of the insulating porcelain bottle and the upper fixing nut, and an upper sealing gasket is arranged between the upper sealing element and the upper fixing nut; and a lower sealing element is arranged between the insulator fixing seat and the lower fixing nut, and a lower sealing gasket is arranged between the lower sealing element and the lower fixing nut.
Preferably, the fuse body comprises a fuse element and a controllable contact arrangement connected to each other.
Preferably, the capacitor core member includes: the capacitor comprises a capacitor core, high-conductivity non-inductive copper foil and an insulating medium; wherein:
the high-conductivity non-inductive copper foil comprises a positive plate and a negative plate, and an insulating medium is arranged between the positive plate and the negative plate; the capacitor core is vertically arranged between the positive plate and the negative plate which are arranged in parallel to form a capacitor core single body; the positive plate adopts an inner lead shaft type non-inductive copper foil welding shaft to form a capacitor core positive electrode of the capacitor core monomer, and the negative plate adopts an outer lead shaft type non-inductive copper foil welding shaft to form a capacitor core negative electrode of the capacitor core monomer;
a plurality of capacitor core monomers connected in parallel form a layer of capacitor core structure, and the negative electrode of the capacitor core in the upper layer of capacitor core structure is connected with the positive electrode of the capacitor core in the lower layer of capacitor core structure through a joint;
the capacitor core structure comprises a plurality of layers of capacitor core structures which are connected in series to form a capacitor core assembly, wherein the capacitor core monomer on each layer of capacitor core structure is provided with at least one layer of rated insulating medium, and the number of insulating medium layers arranged on the capacitor core monomer on the middle layer of capacitor core structure is less than that of insulating medium layers arranged on the capacitor core monomer on the first layer of capacitor core structure and the last layer of capacitor core structure.
Preferably, the insulating medium is a high-molecular metallized polypropylene insulating film.
Preferably, the number of the capacitor core monomers connected in parallel in each layer of the capacitor core structure is determined by the required capacitance and current; the number of capacitor core structure layers connected in series in the capacitor core assembly 7 is determined by the required rated voltage.
Preferably, the multilayer capacitor core structure is an N-layer capacitor core structure, the insulating medium provided by the capacitor core monomers on the 1 st layer and the nth layer of the N-layer capacitor core structure is a 2-fold layer or a 3-fold layer, and the insulating medium provided by the capacitor core monomers on the 2 nd layer to the N-1 th layer of the N-layer capacitor core structure is a 1-fold layer, where N is a natural number.
Preferably, also include the fuse display and discharge display; wherein:
and the fuse display and the discharge display are respectively connected with the DSP controller through a communication device.
Preferably, any one or more of the following features are also included:
when the fuse 2 is blown or failed, the fuse detection control device sends a signal to the DSP controller via the communication device for detection and control, and sends an alarm signal through the fuse display;
when the voltage of the capacitor exceeds a specified range, the DSP controller controls the internal discharger to perform discharge voltage regulation; when the capacitor is powered off, the DSP controller controls the electric energy stored in the capacitor to be released by the internal discharging device, and when the voltage of the capacitor drops below a set voltage within a set time, the DSP controller controls the discharging display to send out a notice;
when the power grid or the capacitor is abnormal or has a fault, the DSP controller controls the fuse to be disconnected, so that the capacitor is separated from the power grid;
when the three-phase current or voltage of the capacitor is unbalanced, the DSP controller controls the internal discharger 4 to discharge through the discharger detection control device 5, and the three-phase current or voltage of the capacitor is detected, adjusted and controlled to keep the three-phase current or voltage of the capacitor in a balanced working state.
Preferably, the predetermined time is 5 to 10 minutes, and the set voltage is 30V.
Preferably, the discharge device, the discharger detection control device and the capacitor core part are respectively arranged in the capacitor shell;
an oil-immersed structure or a dry structure is adopted in the capacitor shell.
The insulator fuse type high-voltage-withstanding capacitor provided by the invention is easy to replace and maintain, the monitoring function and protection of the capacitor are improved, and the high-voltage-withstanding and current-impact-resistant strength of the capacitor is improved by adopting a brand new structure. The safety and controllability of various power equipment consisting of the capacitor are improved; the problems that the existing high-voltage capacitor is difficult to measure and control and is easy to damage are thoroughly solved.
The insulating medium of the capacitor core component adopts a high-voltage-resistant high-strength insulating film of high-polymer metallized polypropylene and a special design structure, the high-voltage-resistant and current impact-resistant capacity of the capacitor is improved by more than 2-fold, a fuse protector and a discharger of the high-voltage capacitor are controlled by the DSP controller, the breakdown-resistant capacity and the protection capacity of the capacitor are improved, and the DSP controller is used for monitoring, regulating, controlling and protecting the capacitor; the invention has good detection and control performance, strong high-pressure resistance and overcurrent impact resistance, small volume, good high-frequency performance and long service life; the device is suitable for various electric equipment such as national power grids, electric trains, railways, metal smelting systems, harmonic and reactive power compensation devices and the like.
The capacitor core is vertically arranged between the positive plates and the negative plates which are arranged in parallel, and the noninductive copper foil welding shaft joint of the upper row of negative plates is connected with the noninductive copper foil welding shaft joint of the lower row of positive plates through a joint. The capacitor core monomers on the 2 nd to N-1 th capacitor core structures adopt 1 time layer of rated voltage high-voltage insulation medium, the capacitor core monomers 7-1-1, 7-1-2, … and 7-1-M insulation medium on the first layer of capacitor core structure and the capacitor core monomers 7-N-1, 7-N-2, … and 7-N-M insulation medium on the last layer of capacitor core structure adopt 2-3 times layer of high-voltage insulation medium of high-molecular metallized polypropylene high-voltage insulation film, and the high-voltage resistance and the impact current resistance strength are improved by more than 2-3 times of the existing capacitor.
The capacitor core monomers in each layer are in a parallel structure, and the parallel number of the capacitor core monomers is determined by the required capacitance and current; the upper layer and the lower layer of the capacitor core assembly adopt a series capacitor core structure, and the number of the series layers is determined by the required rated voltage. The capacitor shell can adopt an oil immersion type or a dry type.
Signals and data of the fuse detection control device and the discharger detection control device are sent to the DSP controller by the communication device for monitoring, adjusting and controlling, and the problems that a high-voltage capacitor is difficult to measure and is easy to damage are thoroughly solved.
Compared with the prior high-voltage capacitor technology, the invention has the following advantages and effects:
1. the combined capacitor positive insulator and the fuse are adopted, the fuse is arranged in the capacitor positive insulator, and the fuse detection control device is arranged on the capacitor positive insulator, so that the installation and the maintenance are convenient;
2. the internal discharger and discharger detection control device is arranged inside the capacitor shell, can adjust and release the charging voltage and the stored electricity quantity on the capacitor,
3. the invention adopts the insulator type fuse, the fuse detection control device and the fuse display, the communication device transmits signals and data of the fuse detection control device to the DSP controller for monitoring and control, when the capacitor or the fuse breaks down and is abnormal, the DSP controller controls the fuse to control and adjust the capacitor, or the capacitor is separated from a power grid, and the problems that the existing capacitor is difficult to measure and uncontrollable are thoroughly solved.
4. The invention is provided with an internal discharger, a discharger detection control device and a discharge display, wherein a communication device transmits signals and data of the internal discharger and the discharger detection control device to a DSP controller for monitoring and controlling; when the capacitor is disconnected from a power supply, the DSP controller controls the internal discharging device to discharge to 30V voltage in 5-10 minutes, so that an operator can operate safely and conveniently, and the defect and the problem that the existing capacitor is inconvenient to control are thoroughly solved.
5. When the three-phase voltage of the capacitor is unbalanced, the DSP controller and the discharger detection control device control the internal discharger to detect, adjust and control the three-phase voltage of the capacitor, so that the three-phase voltage of the capacitor keeps a balanced working state, and the problem that the conventional capacitor cannot be detected and controlled is thoroughly solved.
6. The positive and negative plates of the capacitor core component adopt high-conductivity non-inductive copper foils, so that the conductive flow rate is greatly improved, and the current impact resistance is improved.
7. The capacitor core assembly adopts a special structure, and the insulating medium adopts a high-voltage-resistant high-strength insulating film made of high-molecular metallized polypropylene as the high-voltage-resistant insulating medium, so that the high-voltage-resistant and overvoltage-impact-resistant capacity of the high-voltage capacitor is greatly improved.
8. The capacitor core monomer on the capacitor core structure of the middle layer of the capacitor core assembly adopts 1 layer of rated voltage insulating medium, the capacitor core monomers 7-1-1, 7-1-2, …, 7-1-M insulating medium and 7-N-1, 7-N-2, … and 7-N-M insulating medium of the first layer and the last layer adopt 2 times or multiple layers of high molecular metallized polypropylene high voltage-resistant strong insulating film as the high voltage-resistant insulating medium, the impact voltage resistance can be improved by more than 2 times to multiple times, and the high voltage resistance and the overcurrent impact resistance are greatly enhanced.
9. The insulator fuse type high-voltage capacitor adopts a brand new structure, improves the voltage resistance and the current impact resistance, is more than 2-multiple times of the existing high-voltage capacitor, improves the high voltage resistance and the breakdown-resistant protection capability of the capacitor and power equipment consisting of the high-voltage capacitor, utilizes a DSP (digital signal processor) controller to monitor and protect, has good high-frequency performance, small volume, low temperature, high efficiency, good monitoring and protection performance, safety and reliability, and can be suitable for national power grids below 220KV, harmonic and reactive power compensation of tramways, railways and metal smelting systems, high-power conversion devices and various power equipment.
10. The invention has the high voltage resistance and breakdown prevention protection capability of the capacitor, and thoroughly solves the problems of difficult measurement and control and easy damage of the existing high-voltage capacitor.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a structural view of an appearance of an insulator fuse type high voltage capacitor according to an embodiment of the present invention;
in fig. 1: 1 is a capacitor anode insulator component, 2 is a fuse, 3 is a fuse detection control device, 4 is an internal discharging device, 5 is a discharger detection control device, 6 is a capacitor core anode, 7 is a capacitor core component, 8 is a capacitor core negative shaft, 9 is a communication device, 10 is a DSP controller, 11 is a fuse display, 12 is a discharge display and 13 is a capacitor shell;
FIG. 2 is a schematic diagram illustrating the structure and principle of a capacitor core assembly 7 according to an embodiment of the present invention;
in fig. 2: 1 is a capacitor anode insulator component, 2 is a fuse, 3 is a fuse detection control device, 4 is an internal discharging device, 5 is a discharger detection control device, 6 is a capacitor core anode, 8 is a capacitor core cathode, 9 is a communication device, 10 is a DSP controller, 11 is a fuse display, 12 is a discharging display and 13 is a capacitor shell;
FIG. 3 is a diagram illustrating the structure and the principle of a capacitor core unit of the middle layer of the capacitor core assembly 7 according to an embodiment of the present invention;
in fig. 3: 15 is an insulating medium, 14-1 is a positive plate, and 14-2 is a negative plate;
fig. 4 is a structure and a schematic diagram of a capacitor core monomer of the 1 st layer and the last layer of the capacitor core assembly 7 according to an embodiment of the invention.
In fig. 4: 14-1 is a positive plate, 14-2 is a negative plate, 15-1 is 2 times of layers of high molecular metallized polypropylene high voltage-resistant strong insulating films, and 15-2 is more than 2 times of layers or layers of high molecular metallized polypropylene high voltage-resistant strong insulating films;
FIG. 5 is an external view of a capacitor positive insulator assembly according to an embodiment of the present invention;
in fig. 5: 1-1 is an insulating porcelain bottle, 1-1-1 is an upper screw rod, 1-1-2 is a lower screw rod, 1-2-1 is an upper fixing screw cap, 1-2-2 is a lower fixing screw cap, 1-3-1 is an upper sealing element, 1-3-2 is a lower sealing element, 1-4 is a detection device outer cover, and 1-5 is an insulator fixing seat;
FIG. 6 is a schematic view of a capacitor positive insulator assembly and fuse assembly according to one embodiment of the present invention;
in fig. 6: 1-1 is an insulating porcelain bottle, 1-1-1 is an upper screw rod, 1-1-2 is a lower screw rod, 1-2-1 is an upper fixing screw cap, 1-2-2 is a lower fixing screw cap, 1-3-1 is an upper sealing element, 1-3-2 is a lower sealing element, 1-3-3 is an upper sealing pad, 1-3-4 is a lower sealing pad, 1-4 is a detection device outer cover, 1-5 is an insulator fixing seat, 2 is a fuse, and 2-2-1 is an upper connecting piece;
FIG. 7 is a block diagram of a fuse assembly in accordance with one embodiment of the present invention;
in fig. 7: 2-1-2 is a controllable contact device, 2-2-1 is an upper connecting piece, and 2-2-2 is a lower connecting piece;
fig. 8 is an assembled and exploded view of the various structures of the capacitor positive insulator in accordance with one embodiment of the present invention;
in fig. 8: 1-1 is an insulating porcelain bottle, 1-3-1 is an upper sealing element, 1-3-2 is a lower sealing element, 1-4 is a detection device outer cover, and 1-5 is an insulator fixing seat.
Detailed Description
The following examples illustrate the invention in detail: the embodiment is implemented on the premise of the technical scheme of the invention, and a detailed implementation mode and a specific operation process are given. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Referring to fig. 1 to 8, an insulator fuse type high withstand voltage capacitor includes a capacitor positive electrode insulator assembly 1, a capacitor negative electrode insulator, an internal discharger 4, a discharger detection control device 5, a capacitor core part, a communication device 9, and a DSP controller 10; wherein:
the capacitor positive electrode insulator assembly 1 is connected with the positive electrode of a capacitor core part, the negative electrode of the capacitor core part is connected with a capacitor negative electrode insulator, an internal discharger 4 is arranged between the capacitor positive electrode insulator assembly 1 and the capacitor negative electrode insulator, the discharger detection control device 5 is connected with the internal discharger 4, and the discharger detection control device 5 is connected with the DSP controller 10 through a communication device 9;
the capacitor positive insulator assembly 1 includes: a capacitor anode insulator, a fuse 2 and a fuse detection control device 3; the fuse 2 is arranged inside the capacitor anode insulator, and the fuse detection control device 3 is arranged on the capacitor anode insulator.
As a preferred embodiment, the fuse 2 includes a fuse body, an upper connecting member 2-2-1 and a lower connecting member 2-2-2; the capacitor anode insulator comprises an insulating porcelain insulator 1-1, an upper screw 1-1-1, a lower screw 1-1-2, an upper fixing screw cap 1-2-1, a lower fixing screw cap 1-2-2, an upper sealing element 1-3-1, a lower sealing element 1-3-2, an upper sealing gasket 1-3-3, a lower sealing gasket 1-3-4, a detection device outer cover 1-4 and an insulator fixing seat 1-5;
the fuse body is arranged inside the porcelain insulator 1-1, the upper end of the fuse body is connected with the inner end part of the upper screw rod 1-1-1 through an upper connecting piece 2-2-1, and the outer end part of the upper screw rod 1-1-1 is positioned outside the upper end of the porcelain insulator 1-1 and is fixed through an upper fixing nut 1-2-1; the lower end of the fuse body is connected with the inner end part of a lower screw rod 1-1-2 through a lower connecting piece 2-2-2, the outer end part of the lower screw rod 1-1-2 is positioned outside the lower end of an insulating porcelain bottle 1-1, and an insulator fixing seat 1-5 is installed on the outer end part of the lower screw rod 1-1-2 and is fixed through a lower fixing nut 1-2-2; the detection device outer cover 1-4 is arranged between the insulator fixing seat 1-5 and the insulating porcelain insulator 1-1, and the fuse detection control device 3 is arranged in the detection device outer cover 1-4; an upper sealing element 1-3-1 is arranged between the upper end of the insulating porcelain bottle 1-1 and the upper fixing screw cap 1-2-1, and an upper sealing gasket 1-3-3 is arranged between the upper sealing element 1-3-1 and the upper fixing screw cap 1-2-1; a lower sealing element 1-3-2 is arranged between the insulator fixing seat 1-5 and the lower fixing nut 1-2-2, and a lower sealing gasket 1-3-4 is arranged between the lower sealing element 1-3-2 and the lower fixing nut 1-2-2;
the fuse body comprises a fuse element and a controllable contact arrangement 2-1-2 connected to each other.
The fuse 2 is arranged in the capacitor anode insulator, and the fuse detection control device 3 is arranged on the capacitor anode insulator, so that the installation, maintenance and replacement are convenient; the internal discharger 4 and the discharger detection control device 5 are arranged inside the capacitor shell 13 and are provided with a fuse display 11 and a discharge display 12; the working states of the fuse 2 and the discharger 4 are collected by the fuse detection controllable device 3 and the discharger detection control device 5, and signals and data are sent to the DSP controller 10 through the communication device 9 to monitor, regulate and control the high-voltage capacitor, the fuse and the discharger.
As a preferred embodiment, the capacitor positive insulator assembly 1 comprises two parts: the 1 st part is a capacitor anode insulator, and the second part is a fuse; the capacitor anode insulator comprises: 1-1 parts of an insulating porcelain insulator, 1-1-1 parts of an upper screw rod, 1-1-2 parts of a lower screw rod, 1-2-1 parts of an upper fixing screw cap, 1-2-2 parts of a lower fixing screw cap, 1-3-1 parts of an upper sealing element, 1-3-2 parts of a lower sealing element, 1-3-3 parts of an upper sealing gasket, 1-3-4 parts of a lower sealing gasket, 1-5 parts of an insulator fixing seat and 1-4 parts of a detection device outer cover; the fuse 2 includes: the fuse part, the controllable contact device 2-1-2, the upper connecting part 2-2-1 and the lower connecting part 2-2-2; in this embodiment, the fuse 2, the fuse detection control device 3, the internal discharge device 4, and the discharger detection control device 5 detect, adjust, and control the voltage and the current of the capacitor and the fuse by the DSP controller 10, and have functions of suppressing voltage floating and current impact, adjusting the three-phase voltage balance of the capacitor, and protecting against overcurrent and overvoltage.
As a preferred embodiment, the capacitor core assembly 7 adopts a special structure: the positive plate 14-1 and the negative plate 14-2 adopt high-conductivity non-inductive copper foils, the insulating medium 15 between the positive plate and the negative plate adopts a high-voltage-resistant polymer metalized polypropylene insulating film, and the capacitor core is arranged between the positive plate 14-1 and the negative plate 14-2 to form a capacitor core monomer; a plurality of capacitor core monomers connected in parallel form a capacitor core structure, and a capacitor core cathode 8 of an upper layer of capacitor core monomer is connected with a capacitor core anode 6 of a lower layer of capacitor core monomer through a joint; the multilayer capacitor core structures are connected in series to form a capacitor core assembly 7; a layer of rated voltage insulating medium is arranged on a capacitor core monomer of the middle layer capacitor core structure, and the number of insulating medium layers of the capacitor core monomers of the first layer and the last layer of the capacitor core structure is 2-3 times that of the middle layer insulating medium layers; the capacitor core monomers of each layer are in a parallel structure, and the parallel number of the capacitor cores is determined by the required capacitance and current; the upper and lower capacitor core structures are connected in series, and the number of series layers is determined by the required rated voltage.
Through multiple over-high voltage experiments, the over-voltage breakdown result of the high-voltage capacitor firstly breaks down the 1 st layer of capacitor core insulating medium and secondly breaks down the last layer of capacitor core insulating medium due to the induction of voltage and skin effect; in this embodiment, after the 1 st layer and the last layer of the insulating medium adopt 2 times of layers of insulating media, the breakdown voltage is increased to more than 3 times.
The capacitor anode insulator assembly is a combined insulator fuse, and is convenient to assemble, replace and maintain.
As a preferred embodiment, the fuse detection control device 3 is arranged on the capacitor anode insulator, and the fuse detection control device 3 is arranged in the detection device housing 1-4, so that the assembly, replacement and maintenance are convenient;
as a preferred embodiment, the adopted fuse is a controllable fuse and comprises a fuse-link and a controllable contact device 2-1-2, and through a fuse detection control device 3, when the working current of a high-voltage capacitor and the fuse exceeds a set value, the controllable contact device 2-1-2 is disconnected and gives an alarm; when the controllable contact device 2-1-2 and the fuse detection control device 3 have faults, the high-voltage capacitor exceeds a protection set value, the fuse element is fused, the high-voltage capacitor is separated from a power grid and a circuit, and the alarm gives an alarm to play a role in protecting the power grid and the capacitor.
In a preferred embodiment, an internal discharger 4 and a discharger detection control device 5 are arranged in the capacitor shell; the signal and data of the internal discharger 4 operation state and discharger detection control device 5 are transmitted to the DSP controller 10 by the communication device 9, and the DSP controller 10 controls the discharger 4 to discharge, adjust, regulate and control the capacitor electricity storage quantity and voltage; in the embodiment, the voltage value of the capacitor can be adjusted by the internal discharging device 4, and the three-phase voltage balance adjusting and controlling function is realized;
in a preferred embodiment, the capacitor is in overvoltage or overcurrent, the DSP controller 10 controls the internal discharger 4 to release stored energy of the capacitor and discharge and regulate voltage or protect the capacitor, when the capacitor is abnormal or in fault, the DSP controller 10 controls the fuse 2 and the discharger 4 to inhibit current impact and over-current and overvoltage regulation, when the capacitor is in short circuit, the DSP controller 10 controls the fuse 2 to be disconnected or fused, the capacitor is disconnected from a circuit to protect a power grid or a system, and the discharge display 12 gives an alarm and displays the alarm. Thoroughly solves the problem that the prior high-voltage capacitor is difficult to detect and control,
in the capacitor, a positive plate and a negative plate adopt high-conductivity non-inductive copper foils, an insulating medium 15 between the positive plate and the negative plate adopts a high-polymer metalized polypropylene high-voltage-resistance insulating film, and a capacitor core is arranged between a positive plate 14-1 and a negative plate 14-2 to form a capacitor core monomer; the copper foil welding shaft of the positive plate of the capacitor core monomer is a capacitor core positive electrode 6, and the copper foil welding shaft of the negative plate is a capacitor core negative electrode 8. The upper-layer capacitor core cathode 8 is connected with the lower-layer capacitor core anode 6 through a joint; a plurality of capacitor core monomers connected in parallel form a layer of capacitor core structure, and the plurality of layers of capacitor core structures are connected in series to form a capacitor core assembly 7; a layer of rated insulation medium is arranged on a capacitor core monomer on the capacitor core structure of the middle layer, and the number of insulation medium layers arranged on the capacitor core monomer of the first layer and the last layer is 2-3 times of the number of insulation medium layers of the capacitor core monomer of the middle layer; the voltage breakdown resistance and over-current impact resistance can be improved by more than 2-3 times.
The capacitor core monomers of each layer of the capacitor are in a parallel structure, and the parallel number is determined by the required capacitance and current; the upper and lower capacitor core structures are connected in series, and the number of series layers is determined by the required rated voltage. In the embodiment, the capacitor shell can be oil-immersed or dry;
in a preferred embodiment, the capacitor is provided with an internal discharger 4 and a discharger detection control device 5, and the voltage and the operating state of the capacitor and the unbalanced state of the three-phase voltage of the capacitor can be monitored. When the three-phase voltage of the capacitor is unbalanced, the DSP controller 10 and the discharger detection control device 5 control the inner discharger 4 to discharge and regulate the voltage so as to keep the three-phase voltage of the capacitor in a balanced state. When the capacitor is powered off, the DSP controller 10 controls the electric energy stored in the capacitor to be released through the discharger, the voltage drops below 30V within a specified time, and the discharge display 12 is turned off so as to be convenient for a worker to operate.
The above is one of the preferable structural designs in the present invention, but in other embodiments, the module may have other structures. The above-mentioned preferred structures can be used alone, under the prerequisite that does not conflict each other, also can be used in arbitrary combination, and the effect will be better when using in combination.
Specifically, in order to better understand the technical solution of the present invention, some embodiments of the present invention are further described in detail below with reference to the accompanying drawings.
The insulator fuse type high-voltage capacitor provided by the embodiment has the advantages that the high-voltage resistance strength is improved by 2-fold compared with the prior capacitor technology, the high-voltage resistance and current impact strength of the high-voltage capacitor are greatly improved, the problems of easy breakdown, short circuit and easy damage of the prior capacitor, the problems of difficult measurement and uncontrollable performance, and the impact resistance strength and safety stability of the capacitor are improved. The embodiment is suitable for power grid higher harmonic and reactive power compensation devices, high-voltage high-power variable-frequency speed regulation devices and high-capacity direct-current high-voltage electricity storage devices, improves the high-voltage resistance and current impact resistance of capacitors and power equipment, and improves the stability and safety of a power grid.
Fig. 1 is a view showing an external appearance structure of an insulator fuse type high voltage capacitor according to the present embodiment;
a measurable and controllable fuse 2 is arranged in a capacitor anode insulator, a fuse detection control device 3 is arranged on the capacitor anode insulator, and the capacitor anode insulator further comprises an internal power amplifier 4, a discharger detection control device 5, a capacitor core component (comprising a capacitor core anode 6, a capacitor core component 7, a capacitor core cathode 8, a high-conductivity non-inductive copper foil and an insulating medium 15), a communication device 9, a DSP controller 10, a fuse display 11, a discharge display 12, a capacitor shell 13 and the insulating medium 15 adopt a high-polymer metalized polypropylene high-strength insulating film; the copper foil welding shaft of the high-voltage positive plate of the positive electrode 6 of the capacitor core is of an inner lead type, and the copper foil welding shaft of the high-voltage negative plate of the negative electrode 8 of the capacitor core is of an outer lead type.
As shown in fig. 6, the fuse 2 is assembled inside the capacitor positive insulator, the fuse detection control device 3 is assembled on the capacitor positive insulator, the fuse detection control device 3 is connected with the fuse 2, the upper end of the fuse 2 is connected with the upper screw 1-1-1 of the insulator, and the lower end of the fuse 2 is connected with the lower screw 1-1-2 through the lower connecting piece 2-2-2 of the fuse 2; the discharger detection control device 5 is connected with the inner discharger 4, performs detection control and discharge regulation on the working state of the inner discharger, and regulates the unbalance degree of the voltage value on the high-voltage capacitor and the three-phase voltage; when the high-voltage capacitor fails and is abnormal, the DSP controller 10 controls the fuse 2 and the internal discharger 4 to regulate and protect the high-voltage capacitor, and when the high-voltage capacitor has short circuit and breakdown faults, the DSP controller 10 controls the fuse 2 to be disconnected to protect a power grid and a circuit; when the fuse detection control device 3 and the discharger detection control device 5 have problems, the high-voltage capacitor has faults or breaks down and is in short circuit, and when the current exceeds a set value, the fuse link in the fuse fuses, so that the fault capacitor is cut off from the power grid and the circuit, the protection effect of protecting the power grid and the circuit is achieved, and meanwhile, the alarm gives an alarm.
Fig. 2 is a schematic diagram illustrating a structure of a capacitor core member inside the capacitor case according to the present embodiment.
The capacitor core element is vertically arranged between the positive plates and the negative plates which are arranged in parallel, and a capacitor core negative electrode 8 joint formed by the non-inductive copper foil welding shafts of the upper row of negative plates is connected with a capacitor core positive electrode 6 joint formed by the non-inductive copper foil welding shafts of the lower row of positive plates. The capacitor core monomers 7-1-1, 7-1-2 and 7-1-3 insulating media 15 in the first layer of capacitor core structure and the capacitor core monomers 7-N-1, 7-N-2 and 7-N-3 insulating media 15 in the last layer adopt 2-fold or multi-fold high-voltage-resistant insulating media 15; the impact voltage resistance can be improved by more than 2 times; the middle layer capacitor core monomer, namely the 2 nd layer to the N-1 th layer capacitor core monomer adopts one layer of high insulation medium 15 with rated voltage.
The capacitor core monomers in each layer of the capacitor core structure are in a parallel connection structure, and the parallel connection quantity is determined by the required capacitance; the upper and lower capacitor core structures are connected in series, and the number of series layers is determined by the required rated voltage. The capacitor shell can adopt an oil immersion type or a dry type.
In this embodiment, signals and data from the fuse detection control device 3 and the discharger detection control device 5 are sent to the DSP controller 10 by the communication device 9 for monitoring and control.
The upper end and the lower end of the fuse 2 are connected as shown in figure 6, the upper end of the fuse 2 is connected with an upper screw rod 1-1-1 of the insulator, and the lower end of the fuse 2 is connected with a lower screw rod 1-1-2 through a lower connecting piece 2-2-2; the lower screw 1-1-2 is connected with the positive electrode 6 of the capacitor core;
fig. 3 is a structure and a schematic diagram of the interlayer capacitor core monomer of the present embodiment.
The positive electrode 6 of the capacitor core assembly 7 is an internal guide shaft type positive plate non-inductive copper foil welding shaft, the negative electrode 8 of the capacitor core is an external guide shaft type negative plate non-inductive copper foil welding shaft, and the middle layer insulating medium 15 adopts a layer of rated voltage-resistant high-polymer metalized polypropylene high-voltage-resistant strong insulating film; the positive plate 14-1 and the negative plate 14-2 are made of high-conductivity non-inductive copper foil.
Fig. 4 is a schematic diagram of the structure and the principle of the layer 1 and the last layer of the capacitor core unit 7 of this embodiment.
In FIG. 4, the capacitor core monomers 7-1-1, 7-1-2, 7-1-M insulating medium 15 in the first layer of capacitor core structure of the capacitor core assembly 7 and the capacitor core monomers 7-N-1, 7-N-2, 7-N-M insulating medium 15 in the last layer of capacitor core structure; 15-1 and 15-2 are 2 times or 3 times of high-voltage-resistant insulating mediums 15 of the high-polymer metallized polypropylene high-voltage-resistant strong insulating film, and the impact voltage and current can be improved by more than 2 times or more;
through multiple experiments, the first layer 1 or the last layer of the insulating dielectric layer of the capacitor core is subjected to high-voltage impact and the capacitor core is subjected to breakdown voltage, the 1 st layer and the last layer of the insulating dielectric layer of the capacitor core are subjected to the maximum impact, the impact of the capacitor core in the middle layer is small, and the middle layer can be generally subjected to breakdown after the 1 st layer is broken down. Therefore, the insulating medium 15 of the 1 st layer and the last layer in the capacitor core adopts 2 times or multiple layers of high-voltage-resistant insulating medium 15, and the impact voltage resistance can be improved by more than 2 times or multiple times;
fig. 5 is an external view of the capacitor positive insulator assembly according to the present embodiment.
In the figure 5, 1-1 is an insulating porcelain bottle, 1-1-1 is an upper screw rod, 1-1-2 is a lower screw rod, 1-2-1 is an upper fixing screw cap, 1-2-2 is a lower fixing screw cap, 1-3-1 is an upper sealing element, 1-3-2 is a lower sealing element, 1-3-3 is an upper sealing gasket, 1-3-4 is a lower sealing gasket, 1-4 is a detection device outer cover, and 1-5 is an insulator fixing seat.
Fig. 6 is a plan view of the capacitor positive electrode insulator assembly of the present embodiment.
In FIG. 6, 1-1 is an insulating porcelain bottle, 1-1-1 is an upper screw, 1-1-2 is a lower screw, 1-2-1 is an upper fixing nut, 1-2-2 is a lower fixing nut, 1-3-1 is an upper sealing element, 1-3-2 is a lower sealing element, 1-3-3 is an upper sealing pad, 1-3-4 is a lower sealing pad, 1-4 is a detection device housing, and 1-5 is an insulator fixing seat; 2 is a fuse assembly, and 2-2-1 is an upper connecting piece.
Fig. 7 is an assembly structure view of the fuse assembly according to the embodiment of the present invention.
In fig. 7, 2-1-2 is a controllable contact device, 2-2-1 is an upper connector, and 2-2-2 is a lower connector.
Fig. 8 is an assembled and exploded view of the structures of the capacitor positive insulator of the present embodiment.
In fig. 8, 1-1 is an insulating porcelain bottle, 1-3-1 is an upper sealing element, 1-3-2 is a lower sealing element, 1-4 is a detection device outer cover, and 1-5 is an insulator fixing seat.
In the embodiment, an insulator type fuse 2 is adopted, the fuse 2 is arranged in a capacitor anode insulator, and a fuse detection control device 3 is arranged on the capacitor anode insulator, so that the installation, the replacement and the maintenance are convenient; and is provided with an internal discharger 4, a discharger detection control device 5, a fuse display 11 and a discharge display 12; signals and data of the fuse detection control device 3 and the discharger detection control device 5 are sent to the DSP controller 10 by the communication device 9 for monitoring and control. When the voltage or the current of the capacitor exceeds a specified working range or a fault occurs, the DSP controller 10 controls the internal discharger 4 to discharge, regulate or protect according to the working rule of the power grid, or the DSP controller 10 controls the fuse 2 to perform current limiting protection control operation, and 2-1-2 is a controllable contact device of the fuse, so that the contact point of the fuse is disconnected, and the power grid or the capacitor is protected; when the fuse 2 or the fuse detection control device breaks down, when the current of the capacitor exceeds a set value, the fuse element is fused, the high-voltage capacitor is cut off from the power grid, and meanwhile, an alarm signal is sent out.
When the capacitor is disconnected from a power supply, the DSP controller 10 controls the internal discharge device 4 to discharge the capacitor to 30V voltage within 5-10 minutes, and the alarm is turned off, so that the operation personnel can operate safely and conveniently, and the defect and the problem that the existing capacitor is inconvenient to control are thoroughly solved.
The insulator fuse type high-voltage capacitor provided by the embodiment is suitable for power grid harmonic and reactive power compensation devices and various power equipment, is suitable for special working conditions of metal smelting systems such as steel, iron and aluminum, high-speed rail trains and national power grids, improves the capacity of inhibiting surge voltage and impact current, greatly improves the high-voltage resistance and strong impact resistance of the capacitor, and improves the stability and safety of the capacitor and the power grid.
This embodiment is rational in infrastructure, high pressure resistant and shock resistance are strong, and the operating characteristic is stable, and applicable in all kinds of electric power systems such as national grid, metal smelting, trolley-bus railway, the equipment of being convenient for is maintained, has overcome shortcoming and problem among the prior art, compares with prior art, has following beneficial effect and characteristics:
the signals output by the fuse detection control device 3 and the discharger detection control device 5 of the insulator fuse type high-voltage capacitor provided by the embodiment are transmitted to the DSP controller 10 by the communication device 9 to detect, adjust and control the fuse, the discharger and the high-voltage capacitor, so that the problem that the existing high-voltage capacitor is inconvenient to detect and control is thoroughly solved, the monitoring capability of the capacitor is improved, and the operation controllability, stability and safety of the power equipment and the power system and the power grid formed by the high-voltage capacitor are improved.
The controllable fuse adopted by the embodiment is provided with a fuse element and a controllable contact device 2-1-2, and the controllable contact device 2-1-2 is disconnected and gives an alarm when the working current of the high-voltage capacitor exceeds a set value through the fuse detection control device 3, so that the functions of disconnecting and protecting the high-voltage capacitor are achieved; when the controllable contact device 2-1-2 and the fuse detection control device 3 are in fault, the high-voltage capacitor is in overcurrent or short circuit breakdown, the current exceeds a protection set value, the fuse element is fused, the high-voltage capacitor is disconnected from a power grid and a circuit, and the alarm gives an alarm, so that the power system is in double protection and plays a role in protecting the power grid.
When the capacitor is over-voltage or exceeds the specified range, the DSP controller 10 can control the internal discharging device 4 to discharge the charged amount of the capacitor to adjust the voltage value of the capacitor for control and adjustment.
When the capacitor has over-current or exceeds the specified range, the DSP controller 10 can control the fuse 2 to carry out current limiting or current regulation; when the three-phase current or voltage is in an unbalanced state, the DSP controller 10 controls the fuse 2 and the discharger 4 to adjust the balance of the three-phase current or voltage. When the power grid or the high-voltage capacitor is abnormal or fails, the DSP controller 10 controls the controllable fuse 2 to disconnect the fuse, so that the capacitor is separated from the power grid, and the capacitor or the power grid is protected.
The positive plate and the negative plate of the condenser core of the embodiment adopt high-conductivity non-inductive copper foils, so that the conductive flow rate is greatly improved, and the current impact resistance is improved.
In this embodiment, the insulating medium 15 adopts a "high polymer metalized polypropylene high-strength insulating film" as the insulating medium, so as to greatly improve the high voltage resistance and the overvoltage impact resistance.
In the insulator fuse type high-voltage capacitor of the embodiment, the 1 st row and the last row are provided with high-conductivity non-inductive copper foils, capacitor core monomers 7-1-1, 7-1-2, 7-1-3, … … and 7-1-M on the first layer of capacitor core structure of the capacitor core assembly 7 and capacitor core monomers 7-N-1, 7-N-2, 7-N-3, … … and 7-N-M on the last layer of capacitor core structure adopt 2 times or multiple layers of high-molecular metallized polypropylene high-voltage-resistant strong insulating film high-voltage-resistant insulating media 15, and the high-voltage resistance and the current breakdown resistance can reach more than 2-multiple times of the existing high-voltage capacitor technology;
compared with the prior art, the capacitor has the advantages of high impact voltage resistance, high impact current resistance, good frequency characteristic, small size, good heat dissipation, high electricity storage efficiency and capability of improving the stability and safety of a power equipment system. The method is suitable for various impact loads, high-frequency furnace loads of iron and steel smelting electric arc furnaces, metal electrolysis smelting systems, high-speed rail trains, national power grids and various electric power equipment, and has wide application prospect and social and economic benefits.
The fuse is arranged in an anode insulator of a capacitor, a high-voltage capacitor and a fuse detection device are arranged on the insulator and are easy to replace and maintain, the capacitor is provided with an inner discharger and a discharger detection control device and is also provided with a fuse display and a discharge display, and a capacitor core part adopts a high-voltage-resistant structure, so that high-voltage resistance and shock resistance current are improved by multiple times; in the embodiment, signals and data of the fuse protector, the discharger and the detection control device are sent to the DSP controller by the communication device to monitor, regulate and control the high-voltage capacitor, so that the high-voltage resistance and overcurrent impact resistance of the capacitor are improved, the monitoring function is realized, and the safety and controllability of the capacitor are improved; the problems that the existing high-voltage capacitor is difficult to measure and cannot be controlled and is easy to damage are thoroughly solved; the embodiment has high pressure resistance, good high-frequency performance, small volume and heat and long service life; the device is suitable for electric railways, metal smelting systems, national power grid harmonic and reactive power compensation devices, high-voltage power frequency conversion devices and various power equipment.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. All the drawings are only for convenience of explaining technical contents of the present invention; the numbers, positions of the components, interrelationships between the components, and dimensions of the components used to construct the preferred embodiment do not limit the technical solution itself, but extend to the entire area covered by the technical field.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. An insulator fuse type high-voltage capacitor comprises a capacitor anode insulator assembly (1), a capacitor cathode insulator, an internal discharger (4), a discharger detection control device (5), a capacitor core component, a communication device (9) and a DSP controller (10); wherein:
the capacitor positive electrode insulator assembly (1) is connected with the positive electrode of a capacitor core part, the negative electrode of the capacitor core part is connected with a capacitor negative electrode insulator, an internal discharge device (4) is arranged between the capacitor positive electrode insulator assembly (1) and the capacitor negative electrode insulator, the discharger detection control device (5) is connected with the internal discharge device (4), and the discharger detection control device (5) is connected with the DSP controller (10) through a communication device (9);
the method is characterized in that:
the capacitor positive electrode insulator assembly (1) comprises: the device comprises a capacitor anode insulator, a fuse (2) and a fuse detection control device (3); the fuse (2) is arranged in the capacitor anode insulator, and the fuse detection control device (3) is arranged on the capacitor anode insulator;
the capacitor core member includes: a capacitor core, a high-conductivity non-inductive copper foil and an insulating medium (15); wherein:
the high-conductivity non-inductive copper foil comprises a positive plate (14-1) and a negative plate (14-2), and an insulating medium (15) is arranged between the positive plate (14-1) and the negative plate (14-2); the capacitor core is vertically arranged between a positive plate (14-1) and a negative plate (14-2) which are arranged in parallel to form a capacitor core single body; the positive plate (14-1) adopts an inner-leading-shaft type non-inductive copper foil welding shaft to form a capacitor core positive electrode (6) of a capacitor core monomer, and the negative plate (14-2) adopts an outer-leading-shaft type non-inductive copper foil welding shaft to form a capacitor core negative electrode (8) of the capacitor core monomer;
a plurality of capacitor core monomers connected in parallel form a layer of capacitor core structure, and a capacitor core cathode (8) in the upper layer of capacitor core structure is connected with a capacitor core anode (6) in the lower layer of capacitor core structure through a joint;
the capacitor core structures are connected in series to form a capacitor core assembly (7), the capacitor core monomer on each layer of the capacitor core structure is provided with at least one layer of rated insulating medium (15), and the number of insulating medium (15) layers arranged on the capacitor core monomer on the middle layer of the capacitor core structure is less than the number of insulating medium (15) layers arranged on the capacitor core monomer on the first layer and the last layer of the capacitor core structure.
2. The insulator fuse type high withstand voltage capacitor according to claim 1, wherein: the fuse (2) comprises a fuse main body, an upper connecting piece (2-2-1) and a lower connecting piece (2-2-2); the capacitor anode insulator comprises an insulating porcelain insulator (1-1), an upper screw (1-1-1), a lower screw (1-1-2), an upper fixing nut (1-2-1), a lower fixing nut (1-2-2), an upper sealing element (1-3-1), a lower sealing element (1-3-2), an upper sealing gasket (1-3-3), a lower sealing gasket (1-3-4), a detection device outer cover (1-4) and an insulator fixing seat (1-5);
the fuse body is arranged inside the porcelain insulator (1-1), the upper end of the fuse body is connected with the inner end part of the upper screw rod (1-1-1) through an upper connecting piece (2-2-1), and the outer end part of the upper screw rod (1-1-1) is positioned outside the upper end of the porcelain insulator (1-1) and is fixed through an upper fixing nut (1-2-1); the lower end of the fuse body is connected with the inner end part of a lower screw rod (1-1-2) through a lower connecting piece (2-2-2), the outer end part of the lower screw rod (1-1-2) is positioned outside the lower end of an insulating porcelain bottle (1-1), and an insulator fixing seat (1-5) is installed on the outer end part of the lower screw rod (1-1-2) and fixed through a lower fixing nut (1-2-2); the detection device outer cover (1-4) is arranged between the insulator fixing seat (1-5) and the insulating porcelain bottle (1-1), and the fuse detection control device (3) is arranged in the detection device outer cover (1-4); an upper sealing element (1-3-1) is arranged between the upper end of the insulating porcelain bottle (1-1) and the upper fixing screw cap (1-2-1), and an upper sealing gasket (1-3-3) is arranged between the upper sealing element (1-3-1) and the upper fixing screw cap (1-2-1); a lower sealing element (1-3-2) is arranged between the insulator fixing seat (1-5) and the lower fixing nut (1-2-2), and a lower sealing gasket (1-3-4) is arranged between the lower sealing element (1-3-2) and the lower fixing nut (1-2-2);
the fuse body comprises a fuse element and a controllable contact arrangement (2-1-2) connected to each other.
3. The insulator fuse type high withstand voltage capacitor according to claim 1, wherein: the insulating medium (15) is a high-molecular metallized polypropylene insulating film.
4. The insulator fuse type high withstand voltage capacitor according to claim 1, wherein: the number of the capacitor core monomers connected in parallel in each layer of the capacitor core structure is determined by the required capacitance and current; the number of the capacitor core structure layers connected in series in the capacitor core assembly (7) is determined by the required rated voltage.
5. The insulator fuse type high withstand voltage capacitor according to claim 1, wherein: the multilayer capacitor core structure is an N-layer capacitor core structure, insulating media arranged on capacitor core monomers on the 1 st layer and the N-th layer of the N-layer capacitor core structure are 2 times or 3 times layers, insulating media arranged on capacitor core monomers on the 2 nd layer to the N-1 th layer of the N-layer capacitor core structure are 1 time layers, and N is a natural number.
6. The insulator fuse type high withstand voltage capacitor according to any one of claims 1 to 5, wherein: also comprises a fuse display (11) and a discharge display (12); wherein:
the fuse display (11) and the discharge display (12) are respectively connected with the DSP controller (10) through a communication device (9).
7. The insulator fuse type high withstand voltage capacitor according to claim 6, wherein: any one or more of the following features are also included:
-when the fuse (2) is blown or failed, the fuse detection control device (3) sends a signal to the DSP controller (10) via the communication device (9) for detection and control, and sends an alarm signal through the fuse display (11);
-when the capacitor voltage exceeds a specified range, the DSP controller (10) controls the internal discharge device (4) to perform discharge voltage regulation; when the capacitor is powered off, the DSP controller (10) controls the electric energy stored in the capacitor to be released through the internal discharging device (4), and when the voltage of the capacitor is reduced to be lower than a set voltage within a set time, the DSP controller (10) controls the discharging display (12) to send out a notice;
-when the grid or capacitor is abnormal or faulty, the DSP controller (10) controls the fuse (2) to open, disconnecting the capacitor from the grid;
when the three-phase current or voltage of the capacitor is unbalanced, the DSP controller (10) controls the internal discharging device (4) to discharge through the discharger detection control device (5), and the three-phase current or voltage of the capacitor is detected, adjusted and controlled to keep the three-phase current or voltage of the capacitor in a balanced working state.
8. The insulator fuse type high withstand voltage capacitor according to claim 7, wherein: the specified time is 5-10 minutes, and the set voltage is 30V.
9. The insulator fuse type high withstand voltage capacitor according to claim 6, wherein: the internal discharger (4), the discharger detection control device (5) and the capacitor core part are respectively arranged in the capacitor shell (13);
the capacitor shell (13) is internally of an oil-immersed structure or a dry structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810298207.XA CN108615607B (en) | 2018-04-04 | 2018-04-04 | Insulator fuse type high voltage-resistant capacitor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810298207.XA CN108615607B (en) | 2018-04-04 | 2018-04-04 | Insulator fuse type high voltage-resistant capacitor |
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| CN108615607A CN108615607A (en) | 2018-10-02 |
| CN108615607B true CN108615607B (en) | 2020-06-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109461584B (en) * | 2018-11-03 | 2022-03-22 | 上海广吉电气有限公司 | Intelligent controllable fuse type high-voltage-resistant capacitor and controllable fuse |
| CN112242242A (en) * | 2020-10-16 | 2021-01-19 | 苏州慧诚电力检测有限公司 | Fire prevention type power capacitor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2241381Y (en) * | 1995-12-22 | 1996-11-27 | 牡丹江电力电容器厂 | Self-protection high voltage three phase parallel capacitor |
| KR20080109202A (en) * | 2007-06-12 | 2008-12-17 | 엘지전자 주식회사 | Capacitor |
| CN203325713U (en) * | 2013-05-31 | 2013-12-04 | 国家电网公司 | Power capacitor |
| CN203573821U (en) * | 2013-10-14 | 2014-04-30 | 国家电网公司 | High-voltage parallel capacitor |
| CN108320908A (en) * | 2017-12-27 | 2018-07-24 | 上海广吉电气有限公司 | High voltage impact-resistant high frequency high voltage capacitor |
-
2018
- 2018-04-04 CN CN201810298207.XA patent/CN108615607B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2241381Y (en) * | 1995-12-22 | 1996-11-27 | 牡丹江电力电容器厂 | Self-protection high voltage three phase parallel capacitor |
| KR20080109202A (en) * | 2007-06-12 | 2008-12-17 | 엘지전자 주식회사 | Capacitor |
| CN203325713U (en) * | 2013-05-31 | 2013-12-04 | 国家电网公司 | Power capacitor |
| CN203573821U (en) * | 2013-10-14 | 2014-04-30 | 国家电网公司 | High-voltage parallel capacitor |
| CN108320908A (en) * | 2017-12-27 | 2018-07-24 | 上海广吉电气有限公司 | High voltage impact-resistant high frequency high voltage capacitor |
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