CN114551092A - Special discharging device for power capacitor - Google Patents
Special discharging device for power capacitor Download PDFInfo
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- CN114551092A CN114551092A CN202210224041.3A CN202210224041A CN114551092A CN 114551092 A CN114551092 A CN 114551092A CN 202210224041 A CN202210224041 A CN 202210224041A CN 114551092 A CN114551092 A CN 114551092A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 93
- 238000007599 discharging Methods 0.000 title claims abstract description 60
- 230000000903 blocking effect Effects 0.000 claims abstract description 3
- 238000013016 damping Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 16
- 239000012212 insulator Substances 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 11
- 239000010949 copper Substances 0.000 description 11
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 229910000906 Bronze Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 238000005259 measurement Methods 0.000 description 2
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- 229910001369 Brass Inorganic materials 0.000 description 1
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- 239000010951 brass Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/14—Protection against electric or thermal overload
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/14—Protection against electric or thermal overload
- H01G2/18—Protection against electric or thermal overload with breakable contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/11—End pieces or tapping pieces for wires, supported by the wire and for facilitating electrical connection to some other wire, terminal or conductive member
- H01R11/12—End pieces terminating in an eye, hook, or fork
- H01R11/14—End pieces terminating in an eye, hook, or fork the hook being adapted for hanging on overhead or other suspended lines, e.g. hot line clamp
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The utility model belongs to the technical field of electric power tools, and discloses a special discharging device for an electric power capacitor, which is provided with a short-circuit part, an insulating handle part, a grounding part and an adjustable universal joint (7), and is characterized in that the short-circuit part consists of a short-circuit telescopic rod (1), a contact finger part and a contact finger connecting part (3), and the insulating handle part consists of a telescopic insulating rod (8) and a handheld insulating handle (9); the grounding component is composed of a blocking component (5), a grounding wire and a grounding terminal clamp. The application solves the problems specified in national grid safety regulations 7.4.2: when the device is proved to have no voltage, the maintenance device is immediately grounded and three phases are short-circuited. And the full discharge time of the 10kV capacitor bank is controlled within 5 minutes one by one. The utility model has the following beneficial effects: the charge in the capacitor is released more thoroughly, the personal safety of electric power workers and the operation of related equipment are safer, and the manual labor of the capacitor overhauling operation is shortened.
Description
Technical Field
The utility model belongs to the technical field of electric power tools, and particularly relates to a special discharging device for a power capacitor.
Background
The capacitor belongs to energy storage equipment, and even if equipment is shut down, certain residual charge also exists inside, and in order to guarantee operating personnel safety, the flow of electric power operating personnel when overhauing the operation is that power failure, electricity testing, ground connection, fully discharge to the maintenance equipment earlier. And because the single capacitor in the 10KV capacitor bank of the transformer substation has two-pole outgoing line sleeves, the two-pole outgoing line sleeves are required to be simultaneously grounded in a short circuit mode, and the participation charges can be fully released. In order to ensure the safety of power production, before the capacitor bank is overhauled, a worker must firstly use a capacitor bank discharging tool to discharge the capacitor bank one by one for multiple times and then can work. The existing discharging tools discharge for the whole group of capacitors, consume time and labor in the discharging operation process, and are difficult to discharge quickly, effectively and fully.
CN 212011603U discloses a Y type condenser discharge device relates to power equipment technical field, including the condenser, one side swing joint of condenser has the tip of discharging, the inside one end fixedly connected with electric current line of the tip of discharging, the one end fixedly connected with insurance resistance of electric current line, insurance resistance is located the middle part of electric current line, the electric current line is kept away from the one end fixedly connected with power transmission post of the tip of discharging, the spacing groove has all been seted up with the bottom at the top of power transmission post, the first spring of inside fixedly connected with of spacing groove. According to the Y-shaped capacitor discharging device, the safety resistor is arranged in the discharging tip, so that current is transmitted through the safety resistor, when the capacitor is short-circuited, the current magnitude is increased, and when larger current passes through the safety resistor, the current can exceed the bearing current of the safety resistor, so that the safety resistor is damaged, the current is blocked, and the rear equipment is protected from being damaged. The discharge head is a rod, which is inconvenient for rapid discharge.
CN207069085U discloses condenser ground connection instrument of discharging, including first most advanced metal rod, insulating support, universal joint, telescopic arbitrary lock insulator spindle, short circuit earth connection and the most advanced metal rod of second, first most advanced metal rod with the most advanced metal rod of second is installed on the insulating support that has the sliding tray, the middle part of insulating support is equipped with slide wire resistor, slide wire resistor's one end through take transparent protective sheath short circuit earth connection with first most advanced metal rod is connected, the other end with the most advanced metal rod of second is connected, the bare wire end of short circuit earth connection is connected with ground, the one end of universal joint with insulating support is connected, and the other end is connected with telescopic arbitrary lock insulator spindle. The utility model improves the discharge condition and the discharge method, improves the discharge efficiency and reduces the operation risk. The two electrodes of the capacitor cannot be clamped tightly, the contact is poor, and insufficient discharge is easily caused.
CN 103560004a discloses a special discharging rod for a capacitor, which comprises two discharging arms and two supporting rods, wherein the upper ends of the supporting rods are respectively connected with the lower ends of the two discharging arms; the upper end of each discharge arm is provided with a discharge tip, a discharge resistor is arranged in an inner cavity of each discharge arm, the upper end of the discharge resistor is connected with the discharge tip, and the lower end of the discharge resistor is grounded; the discharging resistor is characterized in that a direct grounding jack is arranged on the discharging tip, and a resistor grounding jack is arranged at the tail end of the discharging resistor. At least one the lower extreme of discharging the arm through rotate and fixed establishment with the bracing piece is connected, can change the contained angle. The discharge arm and the support rod are both of antenna type telescopic structures and can change the length. The utility model can effectively discharge the capacitor once, determine the life safety of power transformation personnel, ensure the reliability of equipment and improve the maintenance scientificity. The discharge rod is grounded at one pole of the 7 positions, and the latest discharge requirement is not met.
CN 2859995Y discloses a portable bulk capacitor, which overcomes the disadvantages of the prior art, and is formed by connecting a telescopic insulating rod, a discharge head, a discharge down lead, a grounding clamp, a copper screw, a bronze gong cap, a gasket, a spring gasket and a red copper contact head, wherein the discharge head is arranged at the top end of the telescopic insulating rod, the gasket and the spring gasket on the discharge head are sleeved on the copper screw, the bronze gong cap is fixed at the top end of the copper screw by a wire, and the red copper contact head is fixed on the discharge head; one end of the discharge downlead is fixed on the discharge head, and the other end of the discharge downlead is connected with the grounding clamp; during the use, pull open scalable insulator spindle, the red copper contact on the discharge head contacts with the condenser, and the ground connection clamp is inserted the underground and is discharged, treats that electric charge when putting away, contracts the insulator spindle again. The bolt needs to be disassembled for locking, and the two poles of the capacitor are clamped and have poor contact, so that the capacitor is easy to slide.
Accordingly, there is a need in the industry for a discharge device dedicated to a power capacitor that allows for efficient, rapid, and reliable discharge.
Disclosure of Invention
In order to solve the above problems, the present invention discloses a discharging device dedicated for a power capacitor, which is implemented by the following technical solution.
A special discharging device for a power capacitor comprises a short-circuit component, an insulating handle component, a grounding component and an adjustable universal joint, it is characterized in that the short-circuit component consists of a short-circuit telescopic rod, a contact finger part and a contact finger connecting part, the short-circuit telescopic rod is provided with a short-circuit telescopic rod body, an expansion spring and a telescopic rod body are arranged in the short-circuit telescopic rod body, the telescopic rod body is connected to the top end and the bottom end of the inside of the short-circuit telescopic rod body, the expansion spring is sleeved on the telescopic rod body, the upper connecting end of the short-circuit telescopic rod is positioned at the top end of the short-circuit telescopic rod body, the lower connecting end of the short-circuit telescopic rod is positioned at the bottom end of the short-circuit telescopic rod body, an adjusting knob extends into the telescopic rod body from the outside of the short-circuit telescopic rod body and can slide up and down for adjustment, the contact finger part comprises a first contact rod and a second contact rod, and the contact finger connecting part can also be called a short circuit grounding wire; the first contact lever is composed of a first contact lever body and a first contact head, the plane part of the first contact head is connected with one end of the first contact lever body, the other end of the first contact lever body is connected with a first connecting body, the upper connecting end of the short-circuit telescopic lever is connected with the first connecting body, the short-circuit telescopic lever is perpendicular to the first contact lever body, the second contact lever is composed of a second contact lever body and a second contact head, the plane part of the second contact head is connected with one end of the second contact lever body, the other end of the second contact lever body is connected with a second connecting body, the lower connecting end of the short-circuit telescopic lever is connected with the second connecting body, the short-circuit telescopic lever is perpendicular to the second contact lever body, and the axis of the first contact lever body and the axis of the second contact lever body are in the same plane; the contact finger connecting part is composed of a short circuit grounding wire body, the short circuit grounding wire body is of a spiral structure, the upper end of the short circuit grounding wire body is a first end of the short circuit grounding wire, the lower end of the short circuit grounding wire body is a second end of the short circuit grounding wire, the first end of the short circuit grounding wire is connected to the first connecting body, and the second end of the short circuit grounding wire is connected to the second connecting body; the insulated handle part consists of a telescopic insulating rod and a handheld insulating handle; the grounding part consists of a blocking part, a grounding wire and a grounding terminal wire clamp; hinder putting the one end that is located scalable insulator spindle of part, hinder the one end of putting the part and being connected with short circuit earth connection second end, scalable insulator spindle has and connects through adjustable universal joint between multisection and the adjacent festival, among the special discharge device of power capacitor, from the top down first adjustable universal joint department has and hinders and put the earthing terminal, hinders the other end of putting the part and hinder and put the earthing terminal and be connected, and the earthing terminal clamp is put in the one end connection of earth connection, and the earthing terminal clamp is connected to the other end of earth connection, and handheld insulating handle cup joints the lower extreme at scalable insulator spindle.
The utility model has the following beneficial effects: the charge in the capacitor is released more thoroughly, the personal safety of electric power workers and the operation of related equipment are safer, and the manual labor of the capacitor overhauling operation is shortened.
Drawings
Fig. 1 is an overall structural schematic diagram of the present invention.
Fig. 2 is a schematic structural view of a short-circuit telescopic rod used in the present invention.
Fig. 3 is a schematic structural view of a first contact bar connection used in the present invention.
Fig. 4 is a schematic structural view of a second contact bar connection used in the present invention.
Fig. 5 is a schematic structural diagram of a short-circuited ground line used in the present invention.
Fig. 6 is a schematic structural view of a retractable insulating rod used in the present invention.
Fig. 7 is a schematic structural view of a hand-held insulating handle used in the present invention.
In the figure: 1-short circuit telescopic link, 2-first contact rod, 3-short circuit earth connection, 4-second contact rod, 5-block part, 6-block earthing terminal, 7-adjustable universal joint, 8-scalable insulator spindle, 9-handheld insulator spindle, 11-short circuit telescopic link body, 12-expanding spring, 13-telescopic link body, 14-regulation knob, 15-short circuit telescopic link upper connection end, 16-short circuit telescopic link lower connection end, 20-first connector, 21-first contact rod body, 22-first contact head, 41-second contact rod body, 42-second contact head, 411-second contact rod body connection end, 30-short circuit earth connection body, 31-short circuit earth connection first end, 32-short circuit earth connection second end, 91-handheld insulating handle antiskid part.
Detailed Description
Referring to fig. 1 to 7, a special discharging device for a power capacitor comprises a short-circuit component, an insulating handle component, a grounding component and an adjustable universal joint 7, and is characterized in that the short-circuit component comprises a short-circuit telescopic rod 1, a contact finger part and a contact finger connecting part 3, the short-circuit telescopic rod 1 comprises a short-circuit telescopic rod tube 11, a telescopic spring 12 and a telescopic rod body 13 are arranged inside the short-circuit telescopic rod tube 11, the telescopic rod body 13 is connected to the top and bottom ends of the short-circuit telescopic rod tube 11, the telescopic spring 12 is sleeved on the telescopic rod body 13, an upper connecting end 15 of the short-circuit telescopic rod is arranged at the top end of the short-circuit telescopic rod tube 11, a lower connecting end 16 of the short-circuit telescopic rod is arranged at the bottom end of the short-circuit telescopic rod tube 11, an adjusting knob 14 extends from the outside of the short-circuit telescopic rod tube 11 to the telescopic rod body 13 and can be adjusted in a vertical sliding manner, the contact finger part comprises a first contact rod 2 and a second contact rod 4, the contact finger connecting part can also be called a short circuit grounding wire; the first contact lever 2 is composed of a first contact lever body 21, the short-circuit telescopic rod comprises a first contact head 22, wherein a plane part of the first contact head 22 is connected with one end of a first contact rod body 21, the other end of the first contact rod body 21 is connected with a first connecting body 20, an upper connecting end 15 of a short-circuit telescopic rod is connected with the first connecting body 20, the short-circuit telescopic rod 1 is perpendicular to the first contact rod body 21, a second contact rod 4 comprises a second contact rod body 41 and a second contact head 42, a plane part of the second contact head 42 is connected with one end of the second contact rod body 41, the other end of the second contact rod body 41 is connected with a second connecting body, a lower connecting end 16 of the short-circuit telescopic rod is connected with the second connecting body, the short-circuit telescopic rod 1 is perpendicular to the second contact rod body 41, and the axis of the first contact rod body 21 and the axis of the second contact rod body 41 are in the same plane; the contact finger connecting part 3 is composed of a short circuit grounding wire body 30, the short circuit grounding wire body 30 is of a spiral structure, the upper end of the short circuit grounding wire body 30 is a first short circuit grounding wire end 31, the lower end of the short circuit grounding wire body 30 is a second short circuit grounding wire end 32, the first short circuit grounding wire end 31 is connected to the first connecting body 20, and the second short circuit grounding wire end 32 is connected to the second connecting body; the insulated handle part consists of a telescopic insulating rod 8 and a handheld insulating handle 9; the grounding part consists of a resistance-discharge part 5, a grounding wire and a grounding terminal wire clamp; hinder putting the scalable insulator spindle 8 that is located of part 5, the one end that hinders putting part 5 is connected with short circuit earth connection second end 32, and scalable insulator spindle 8 has and connects through adjustable universal joint 7 between multisection and the adjacent festival, among the special discharge device of power capacitor, from the top down first adjustable universal joint 7 department has and hinders and put earthing terminal 6, hinders the other end that puts part 5 and hinders and put earthing terminal 6 and be connected, and the one end of earth connection is connected and is hindered and put earthing terminal 6, and the earthing terminal fastener is connected to the other end of earth connection, and handheld insulating handle 9 cup joints the lower extreme at scalable insulator spindle 8.
The special discharging device for the power capacitor is characterized in that the short-circuit telescopic rod 1 is a spring damping telescopic rod, the telescopic range is larger than 5cm, and the damping of the extension of 5cm is smaller than 3 newtons; the preferred length of the spring damped telescoping rod is 10 meters.
The discharging device special for the power capacitor is characterized in that the first contact is in a ball head shape.
The discharging device special for the power capacitor is characterized in that the second contact is in a ball head shape.
The discharging device special for the power capacitor is characterized in that the material of the contact finger part is preferably copper.
The special discharging device for the power capacitor is characterized in that the contact finger connecting part is a spiral short-circuit wire, and the contact resistance is less than 40u omega.
The special discharging device for the power capacitor is characterized in that the extension length of the telescopic insulating rod 8 is greater than 1.5m, and the contraction length of the telescopic insulating rod is less than 0.7 m.
The special discharging device for the power capacitor is characterized in that the telescopic insulating rod 8 is made of an epoxy resin insulating pipe, and the withstand voltage strength of the insulating rod is greater than 42 kV.
The special discharging device for the power capacitor is characterized in that the handheld part is a threaded straight handle, the handheld part is provided with a protective ring, and the displacement of the handheld part under 100N tension is smaller than 2 mm.
The special discharging device for the power capacitor is characterized in that the handheld insulating handle 9 is made of insulating rubber.
The discharging device special for the power capacitor is characterized in that the discharge resisting component 5 is formed by connecting a plurality of color ring resistors in series, the discharge time of a single capacitor is less than 6s, and all the ring resistors do not generate heat obviously.
The discharging device special for the power capacitor is characterized in that the grounding wire part is detachable and made of annealed copper wires, and the length of the grounding wire part is larger than 3 m.
The special discharging device for the power capacitor is characterized in that the grounding terminal clamp is of a clamp type, and the contact resistance is less than 1m omega.
The special discharging device for the power capacitor is characterized in that when the special discharging device for the power capacitor is used for discharging the power capacitor, the short circuit time of a single capacitor is less than 8 s.
In the creation of the present invention, the applicant made a number of experiments, mainly as follows.
The applicant also finds out that the radius of the high-voltage pile head support of a single capacitor is on-site surveyed and recorded, and the installation distance between the two capacitors is on-site surveyed and recorded, and the obtained conclusion is that: the radius range of a high-voltage pile head support of the capacitor is 6cm-8cm, the gap distance range of two adjacent capacitors is 20cm-26cm, when discharging wiring is carried out, in order to meet the requirement of on-site actual work, a contact finger of a discharging tool needs to be in good contact with the pile head of the capacitor and is not easy to fall off, and finally the length of the manufactured contact finger is determined to be 10 cm. Finally, the best effect is confirmed when the contact finger part with the length of 10cm is manufactured in a ball head shape by adopting a copper material.
The applicant also adopted the following tests: when the upper contact finger part and the lower contact finger part are connected by the spiral short connecting wire, the spiral short connecting wire and the spring damping telescopic short connecting rod are assembled, contact resistance tests of the upper contact finger and the lower contact finger of the spiral short connecting wire are carried out for 10 times to ensure that the contact resistance meets target requirements during stretching, and the connecting part is stretched to 5 cm.
The contact resistance values of the spiral short-circuit wires are within 40 mu omega when the spiral short-circuit wires are in a stretching state.
In order to verify the reliability of insulation when the insulating rod is made of epoxy resin, the applicant carried out a withstand voltage test in which a voltage of 42kV was applied to the insulating rod for one minute, and obtained the following results.
In order to verify the friction force of the hand-held part made of the rubber with the shape of the straight shank of the screw thread, the applicant carries out a tension falling test on the hand-held part, the total weight of the discharge tool is 5kg, and the test target is that the seal displacement is less than 2mm under the tension of 100N considering 4 times of allowance. The test method comprises the following steps: transversely placing an insulating rod with a threaded alignment handle insulating rubber hand-held part, fixing the insulating rod, repeatedly pulling the threaded alignment handle insulating rubber 25 times by using a precise spring scale, determining that the sealing displacement is less than 2mm to be qualified, and changing the tension for 10 times respectively.
According to the tensile test data, the displacement of the handheld part does not exceed 2mm in the test process, so that the handheld part made of the insulating rubber of the thread straightening handle is qualified.
The applicant selects the color ring resistor combination to manufacture the grounding resistance discharge of the discharge tool, and in order to verify whether the grounding resistance discharge part manufactured by the color ring resistor combination meets the discharge requirement, the discharge test is carried out on the field capacitor bank according to the manufactured discharge tool. The test method comprises the following steps: selecting a single capacitor with the capacity of 334kVar, connecting the color ring resistor combination and the ammeter in series between two pile heads of the capacitor, charging the capacitor for 1min by using a 5kV insulating megger, closing a disconnecting link after removing the insulating megger, and recording the time taken by the pointer of the ammeter to deflect to zero, thereby obtaining the discharge time of the capacitor. The color ring resistor combination part is composed of 5 individual color ring resistors, the resistance value is changed, and the following results are obtained through tests.
As can be seen from the discharge data in the above table, when the resistance value of the color ring resistor combination is too small, the resistor is heated and damaged during the discharge process, and even the fuse inside the capacitor is burned; when the resistance of the color wheel resistor combination is too large, the discharge time is too long. According to this test, the resistance value of the color wheel resistor combination was determined to be 37.5M Ω. According to the principle of discharge tool, drawing circuit board diagram according to circuit diagram, processing circuit board, welding element on the circuit board, adopting colour ring resistor combination and series-connecting several colour ring resistors. The resistance of the manufactured color ring resistance combined circuit board is measured, and a discharge test is performed, so that the following records are obtained.
According to the resistance value measurement results, the manufactured color ring resistor combined circuit board finished product meets the standard.
The applicant manufactures the grounding wire by adopting multiple strands of soft copper wires with the length of 16 square millimeters and the length of the grounding wire which are alternate yellow and green for the grounding wire of the discharging rod, and considers that the soft copper wires and the insulating rod are assembled by adopting the detachable nuts, the optimal length of the grounding wire is selected, the maximum distance between the pile head on each capacitor and the grounding end is surveyed on site, the site survey data shows that the maximum distance between the pile head on each capacitor and the grounding end is larger than 3m, and therefore the selected length of the grounding wire is larger than 3 m. Considering on-site actual work needs and accomodate the convenience, the detachable earth connection length of final preparation is 4 m.
The applicant tests the discharging device in the utility model, carries the assembled 10kV capacitors to a 110kV forward transformer substation one by one to perform field test, and tests 10 times of short circuit of a single capacitor by using the tool on the field of the 10kV capacitor bank of the transformer substation, wherein the target value of the short circuit of the single capacitor is less than 8s, and the test is qualified. After discharging the tool one by one using 10kV capacitors, the full discharge time of the 10kV capacitor bank one by one was 4 minutes 36 seconds on average, less than the target value for 5 minutes. The target value was reached within 5 minutes.
The principle of the utility model is as follows: because the capacitor is provided with the two-pole sleeve, the two-pole sleeve of the capacitor needs to be simultaneously short-circuited and grounded to discharge fully, and the conventional discharge rod for the test can only meet the requirement of single-pole grounding and cannot be reliably contacted. Resulting in incomplete discharge. Through redesign, because the interval size standard of capacitor two-pole sleeve pipes of each manufacturer is different, in order to cover the capacitor, the top of the discharge rod is transformed into a telescopic adjustable spring pull rod, the adjustment interval of the spring pull rod is converted into a standard size capable of considering all capacitors through the size measurement of various capacitors, two discharge contact rods made of brass materials are additionally fixed at two ends of the pull rod, the direction and the upper and lower positions of the contact rods are designed into an adjustable locking mode, in order to solve the problem that the discharge rod is in poor direct contact with the capacitor sleeve pipes, the two-pole contact of the two-pole discharge contact rods and the two-pole contact of the capacitor to be detected are reliably clamped towards the middle through the tensile force of the spring, and the requirement that the clamping force accords with good contact is verified through measuring resistance. Because the spring pull rod is arranged between the two contact rods, the unreliable connection of the spring pull rod is considered, the contact resistance is overlarge, the short circuit of two pole sleeves of the capacitor is insufficient, the spring type ground wire with the length of 30 square millimeters is additionally arranged between the two contact rods, the length of the ground wire is automatically adjusted along with the spring pull rod when the spring pull rod is adjusted, the two poles of the capacitor can be reliably short-circuited, the resistance is additionally arranged inside the insulating rod at the grounding end of the discharging device, the short-circuit discharging current can be limited, electric arcs cannot be generated, and the device is protected from being damaged.
The difference between the present application and 200520031258.4 lies in that the discharge rod is specially used for the single capacitor discharge of a 10KV capacitor bank, and the discharge head of the discharge rod is telescopic and adjustable and simultaneously contacts two electrodes of the capacitor bank for discharge. This application and 201310519384.3 difference lie in that this discharging rod discharge head is scalable clamp design, can press from both sides the tight with the condenser two poles of the earth, just so can make discharging rod and the contact of condenser two poles of the earth conductor can, it is more abundant to discharge. The difference between the discharging rod and the discharging rod 201721047677.6 is that the distance between two discharging heads of the discharging rod is in two adjustable states, the discharging rod can adapt to capacitors of various models and specifications, and if the adjustable interval of an internal spring rod is checked, the maximum interval can be adjusted through a locking bolt of the first discharging head at the end part. And the capacitor discharge requires that both poles are first shorted to ground, while the 201721047677.6 discharge bar is 7 with one pole first grounded. Does not meet the discharge requirements. This application and 202021138042.9 difference lie in that this patent adjustment part need not to dismantle the bolt locking, and to the clamp force of condenser two poles of the earth through the spring beam, and it is good to guarantee to contact, the function of difficult landing.
The application mainly has the following beneficial technical effects: after the application, the capacitor bank can discharge for multiple times one by one to carry out more thorough discharge work, the charges in the capacitor are thoroughly discharged, the personal safety of electric power workers is effectively guaranteed, and the harm of residual charges is avoided, so the personal safety is ensured; the application ensures the safe operation of related equipment, and prevents the damage of the capacitor due to overlarge discharge current in the discharge process through the discharge resistor, so that the equipment is safer; when this application has shortened the manual work of condenser maintenance operation, 10kV capacitor bank is enough discharge time one by one after the new instrument uses and is shortened to 5 minutes, and it is long to discharge before comparing, has saved 70% time.
The above-mentioned embodiments are merely preferred technical solutions of the present invention, and should not be construed as limiting the present invention. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the utility model.
Claims (7)
1. A special discharging device for a power capacitor is provided with a short-circuit component, an insulating handle component, a grounding component and an adjustable universal joint (7), and is characterized in that the short-circuit component is composed of a short-circuit telescopic rod (1), a contact finger part and a contact finger connecting part (3), the short-circuit telescopic rod (1) is provided with a short-circuit telescopic rod pipe body (11), a telescopic spring (12) and a telescopic rod body (13) are arranged inside the short-circuit telescopic rod pipe body (11), the telescopic rod body (13) is connected with the top and the bottom of the inside of the short-circuit telescopic rod pipe body (11), the telescopic spring (12) is sleeved on the telescopic rod body (13), an upper connecting end (15) of the short-circuit telescopic rod is positioned at the top end of the short-circuit telescopic rod pipe body (11), a lower connecting end (16) of the short-circuit telescopic rod is positioned at the bottom end of the short-circuit telescopic rod pipe body (11), and an adjusting knob (14) extends into the telescopic rod body (13) from the outside of the short-circuit telescopic rod pipe body (11) and can be adjusted in a vertical sliding way, the contact finger part comprises a first contact rod (2) and a second contact rod (4), and the contact finger connecting part can also be called as a short circuit grounding wire; the first contact lever (2) is composed of a first contact lever body (21) and a first contact head (22), the plane part of the first contact head (22) is connected with one end of the first contact lever body (21), the other end of the first contact lever body (21) is connected with a first connecting body (20), the upper connecting end (15) of the short-circuit telescopic lever is connected with the first connecting body (20), the short-circuit telescopic lever (1) is vertical to the first contact lever body (21), the second contact lever (4) is composed of a second contact lever body (41) and a second contact head (42), the plane part of the second contact head (42) is connected with one end of the second contact lever body (41), the other end of the second contact lever body (41) is connected with a second connecting body, the lower connecting end (16) of the short-circuit telescopic lever is connected with the second connecting body, the short-circuit telescopic lever (1) is vertical to the second contact lever body (41), the axis of the first contact rod body (21) and the axis of the second contact rod body (41) are in the same plane; the contact finger connecting part (3) is composed of a short circuit grounding wire body (30), the short circuit grounding wire body (30) is of a spiral structure, the upper end of the short circuit grounding wire body (30) is a first short circuit grounding wire end (31), the lower end of the short circuit grounding wire body (30) is a second short circuit grounding wire end (32), the first short circuit grounding wire end (31) is connected to the first connecting body (20), and the second short circuit grounding wire end (32) is connected to the second connecting body; the insulated grip component consists of a telescopic insulated rod (8) and a handheld insulated handle (9); the grounding part consists of a blocking-releasing part (5), a grounding wire and a grounding terminal wire clamp; the power capacitor special discharge device comprises a resistance-discharge component (5), a telescopic insulating rod (8), a plurality of sections of telescopic insulating rods (8), and adjustable universal joints (7), wherein one end of the resistance-discharge component (5) is connected with a second end (32) of a short-circuit grounding wire, the telescopic insulating rod (8) is provided with a plurality of sections, and adjacent sections are connected through the adjustable universal joints (7), a resistance-discharge grounding end (6) is arranged at the first adjustable universal joint (7) from top to bottom, the other end of the resistance-discharge component (5) is connected with the resistance-discharge grounding end (6), one end of the grounding wire is connected with the resistance-discharge grounding end (6), the other end of the grounding wire is connected with a grounding end wire clamp, and a handheld insulating handle (9) is sleeved at the lower end of the telescopic insulating rod (8); the material of the handheld insulating handle (9) is insulating rubber; the discharge resisting component (5) is formed by connecting a plurality of color ring resistors in series, the discharge time of a single capacitor is less than 6s, and all the ring resistors do not generate heat obviously.
2. The special discharging device for the power capacitor as claimed in claim 1, wherein the short-circuit telescopic rod (1) is a spring damping telescopic rod, the telescopic range is greater than 5cm, and the damping is less than 3 newtons when the short-circuit telescopic rod is extended by 5 cm.
3. A special discharging device for a power capacitor as recited in claim 2, wherein the first contact is shaped like a ball and the second contact is shaped like a ball.
4. A special discharging device for power capacitor as claimed in claim 3, wherein said finger connecting part is a spiral shorting bar with a contact resistance less than 40u Ω.
5. A special discharging device for power capacitors as in claim 4, characterized in that said telescopic insulating rod (8) has an extended length greater than 1.5m and a contracted length less than 0.7 m.
6. A special discharging device for power capacitor as claimed in claim 5, characterized in that said telescopic insulating rod (8) is made of epoxy resin insulating tube, and the dielectric strength of the insulating rod is greater than 42 kV.
7. The discharging device as claimed in claim 6, wherein the handle is a threaded shank, the handle has a guard ring, and the displacement of the handle under 100N tension is less than 2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210224041.3A CN114551092A (en) | 2022-03-09 | 2022-03-09 | Special discharging device for power capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210224041.3A CN114551092A (en) | 2022-03-09 | 2022-03-09 | Special discharging device for power capacitor |
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| CN114551092A true CN114551092A (en) | 2022-05-27 |
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| CN202210224041.3A Pending CN114551092A (en) | 2022-03-09 | 2022-03-09 | Special discharging device for power capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115172044A (en) * | 2022-06-22 | 2022-10-11 | 国网河南省电力公司杞县供电公司 | Special discharging device for power capacitor |
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2022
- 2022-03-09 CN CN202210224041.3A patent/CN114551092A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115172044A (en) * | 2022-06-22 | 2022-10-11 | 国网河南省电力公司杞县供电公司 | Special discharging device for power capacitor |
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