CN109888762B - Low partial discharge resistance-capacitance type overvoltage suppression device and manufacturing method thereof - Google Patents
Low partial discharge resistance-capacitance type overvoltage suppression device and manufacturing method thereof Download PDFInfo
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Abstract
The application discloses a low-partial-discharge resistance-capacitance type overvoltage suppression device and a manufacturing method thereof, wherein the low-partial-discharge resistance-capacitance type overvoltage suppression device comprises an epoxy shell, an epoxy fixing plate, two high-voltage resistors, six high-voltage capacitors, six equalizing resistors, a leading-out terminal, two C-shaped connecting pieces, two L-shaped connecting pieces and five T-shaped connecting pieces; when the hollow shunt reactor is subjected to switching overvoltage, the shunt reactor converts stored electromagnetic energy into electric energy, the electric energy is released back to a bus through an absorption loop formed by the high-voltage capacitor and the high-voltage resistor, and the shunt reactor body is not vibrated any more, so that the shunt reactor body is protected from being damaged by overvoltage.
Description
Technical Field
The application relates to the technical field of reactors, in particular to a low-partial discharge resistance-capacitance type overvoltage suppression device and a manufacturing method thereof.
Technical Field
The dry hollow shunt reactor is necessary equipment for reactive power compensation in a power grid, breaker switching operation can occur in a power substation sometimes, and the breaker switching can generate operation overvoltage which can cause insulation aging of the reactor, reduce the service life of the reactor and even cause safety accidents such as insulation breakdown of the reactor.
In order to solve the problem of insulation aging of the reactor caused by frequent switching over voltage, effective overvoltage suppression measures are required to be implemented, so that the safety accidents of the reactor are reduced, and the power supply stability is ensured.
The capacitor in the common resistive-capacitive absorber has a certain partial discharge phenomenon, the partial discharge causes the body to expand, the possibility of electric breakdown is increased, the capacitor is an important cause for early damage, and the reduction of the partial discharge of the capacitor of the resistive-capacitive absorber plays an important role in prolonging the service life of equipment.
Disclosure of Invention
The application aims to provide a low partial discharge resistance-capacitance overvoltage suppression device which is used in parallel with a dry hollow shunt reactor and can effectively reduce the amplitude of switching overvoltage.
The technical scheme adopted for solving the technical problems is as follows:
a low partial discharge resistance-capacitance type overvoltage suppression device is characterized in that: comprising
An epoxy shell which is an epoxy glass cloth tube with two ends sealed;
the epoxy fixing plate is a strip epoxy plate and is fixed in the epoxy shell through a fastener, and is divided into a non-slotting section and a slotting section, wherein at least two rectangular grooves which are alternately arranged along the length direction of the slotting section are formed in the slotting section;
at least two high-voltage resistors which are positioned on the ungrooved section of the epoxy fixing plate and are distributed at intervals along the length direction of the ungrooved section;
the number of the high-voltage capacitors is the same as that of the rectangular grooves, and each high-voltage capacitor is respectively positioned in each rectangular groove of the epoxy fixing plate;
the number of the voltage equalizing resistors is the same as that of the high-voltage capacitors, and each voltage equalizing resistor is respectively positioned on the same side of each high-voltage capacitor;
the lead-out terminal is positioned at the outer end part of the slotting section of the epoxy fixing plate and is a wiring terminal with long strip holes and good electric conduction; and
a connecting piece, which comprises at least one C-shaped connecting piece, two L-shaped connecting pieces and at least one T-shaped connecting piece,
the high-voltage resistors are connected in series through a C-shaped connecting piece, a T-shaped connecting piece is arranged between the adjacent voltage-sharing resistors, two connectors of each T-shaped connecting piece are respectively connected with one voltage-sharing resistor to realize the series connection of the adjacent voltage-sharing resistors, and a third connector is used for connecting the adjacent high-voltage capacitors in series, so that each high-voltage capacitor is connected in parallel with the voltage-sharing resistor at the corresponding position, the outer ends of the high-voltage capacitors and the voltage-sharing resistors at the two ends are respectively provided with an L-shaped connecting piece, wherein the two ends of the L-shaped connecting piece close to the high-voltage resistor are respectively connected with the voltage-sharing resistor, the high-voltage capacitor to realize the parallel connection of the voltage-sharing resistor and the high-voltage capacitor, and the two ends of the L-shaped connecting piece close to the leading-out terminal are respectively connected with the voltage-sharing resistor, the high-voltage capacitor to realize the parallel connection of the voltage-sharing resistor and the high-voltage capacitor, and are connected with the leading-out terminal in series.
The high-voltage capacitor is a capacitor with a direct-current withstand voltage of more than 40kV and a capacitance value of 24 nF.
The high-voltage resistor is a thick film noninductive resistor with the resistance value of 1kΩ.
The equalizing resistor is a thick film noninductive resistor with the resistance value of 20MΩ.
The C-shaped connecting piece, the L-shaped connecting piece and the T-shaped connecting piece are metal pieces with good electric conduction performance.
The epoxy shell is an epoxy glass cloth tube with the length of 1m and the thickness of 5mm and two sealed ends.
The application also provides a manufacturing method of the low partial discharge resistance-capacitance type overvoltage suppression device for the dry-type hollow paralleling reactor, which comprises the following steps:
a. coating the binding posts on the two sides of the high-voltage resistor, the high-voltage capacitor and the voltage equalizing resistor with sealing films, coating a layer of curing cement on the surfaces of the high-voltage resistor, the high-voltage capacitor and the voltage equalizing resistor, mixing the curing cement with epoxy resin, a curing agent and fumed silica to form the epoxy resin, the curing agent and the fumed silica, wherein the mixing mass ratio of the epoxy resin to the curing agent to the fumed silica is 10:3:1, and compacting the coating layer by using a grinding tool;
b. wrapping the surface of a coating layer of the high-voltage resistor, the high-voltage capacitor and the equalizing resistor by using a semi-dry glass fiber adhesive tape;
c. uniformly coating the semi-dry glass fiber adhesive tape wrapped on the surfaces of the high-voltage resistor, the high-voltage capacitor and the voltage equalizing resistor with double H adhesives;
d. placing the high-voltage resistor, the high-voltage capacitor and the voltage equalizing resistor coated with the double-H glue into a baking oven, baking for 2.5 hours at 70 ℃, and gradually cooling to room temperature after cooling time of 1 hour;
e. and (3) mounting the dried high-voltage resistor, high-voltage capacitor and voltage equalizing resistor on an epoxy fixing plate, carrying out on-off measurement of each part, and mounting the epoxy fixing plate inside an insulating shell without abnormality in measurement.
The application has the beneficial effects that:
the low partial discharge resistance-capacitance type overvoltage suppression device for the dry type hollow shunt reactor is used in parallel with the hollow shunt reactor, when bus voltage passing through the hollow shunt reactor normally operates, the high-voltage capacitor of the device is in a charging state, and rated current passes through the high-voltage resistor; when the hollow shunt reactor is subjected to switching overvoltage, the shunt reactor converts stored electromagnetic energy into electric energy, the electric energy is released back to a bus through an absorption loop formed by the high-voltage capacitor and the high-voltage resistor, and the shunt reactor body is not vibrated any more, so that the shunt reactor body is protected from being damaged by overvoltage.
The device has simple structure, convenient installation and small volume, and does not occupy extra space when being arranged on the hollow shunt reactor.
The device adopts the voltage equalizing resistor when guaranteeing to restrain overvoltage, can effectively reduce the partial discharge of high-voltage capacitor, improves the life of equipment.
The high-voltage resistor, the high-voltage capacitor and the voltage equalizing resistor of the device are coated with the insulating coating, so that the creepage distance of equipment is increased, and the safety coefficient is improved.
Drawings
The drawings are only for illustrative purposes and are not intended to limit the scope of the present application. Wherein, the liquid crystal display device comprises a liquid crystal display device,
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a schematic view of an epoxy fixing plate structure according to the present application;
fig. 3 is a schematic diagram of the electrical connection of the present application.
Reference numerals:
in fig. 1-2:
1. a high voltage resistor;
2. epoxy fixing plate, 21, rectangular groove, 22, non-slotted section, 23.
3. High-voltage capacitor, 4. Equalizing resistor, 5.C type connector, 6.L type connector, 7.T type connector, 8. Leading-out terminal;
in fig. 3: c (C) 0 Representing 3. High voltage capacitor of FIG. 1, R 0 Represents 4. Equalizing resistance of FIG. 1, R 1 Representing the 1. High voltage resistor of fig. 1.
Detailed Description
The following related art, which is not described below, may be used or referred to in the art.
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
As shown in fig. 1-2, the low-partial discharge resistive-capacitive overvoltage suppression device for the dry-type hollow shunt reactor comprises an epoxy shell (not shown in the figure), an epoxy fixing plate 2, two high-voltage resistors 1, six high-voltage capacitors 3, six voltage equalizing resistors 4, a lead-out terminal 8, two C-shaped connecting pieces 5, two L-shaped connecting pieces 6 and five T-shaped connecting pieces 7.
The epoxy shell is an epoxy glass cloth pipe with two ends sealed;
the epoxy fixing plate 2 is a strip epoxy plate and is fixed in the epoxy shell through a fastener, and is divided into a non-slotting section 22 and a slotting section 23, wherein six rectangular grooves 21 which are alternately arranged along the length direction of the slotting section 23 are formed in the slotting section;
the two high-voltage resistors 1 are positioned on the non-slotting section 22 of the epoxy fixing plate 2 and are distributed at intervals along the length direction of the non-slotting section 22;
the six high-voltage capacitors 3 are respectively positioned in six rectangular grooves 21 of the epoxy fixing plate 2;
the six voltage equalizing resistors 4 are respectively positioned at the corresponding positions of the same side of the six high-voltage capacitors 3;
the leading-out terminal 8 is positioned at the outer end part of the slotted section 23 of the epoxy fixing plate 2, is a wiring terminal with long strip holes and good electric conduction, and is used for the parallel reactor;
the two high-voltage resistors 1 are connected in series through a C-shaped connecting piece 5, a T-shaped connecting piece 7 is arranged between every two adjacent voltage-sharing resistors 4, two connectors of each T-shaped connecting piece 7 are respectively connected with one voltage-sharing resistor 4 to realize the series connection of the adjacent voltage-sharing resistors 4, and a third connector is used for connecting the adjacent high-voltage capacitors 3 in series, so that each high-voltage capacitor 3 is connected in parallel with the voltage-sharing resistor 4 at the corresponding position, an L-shaped connecting piece 6 is respectively arranged at the outer ends of the high-voltage capacitors 3 and the voltage-sharing resistors 4, the L-shaped connecting piece 6 close to the high-voltage resistors 1 is respectively connected with the voltage-sharing resistor 4 and the high-voltage capacitor 3 to realize the parallel connection of the voltage-sharing resistor 4 and the high-voltage capacitor 3, and the L-shaped connecting piece 6 close to the leading-out terminal 8 is respectively connected with the voltage-sharing resistor 4, the high-voltage capacitor 3 in parallel, and the high-voltage capacitor 3 in series connection with the leading-out terminal 8.
FIG. 3 is a schematic diagram of the electrical connection of the present application, six C 0 Between are connected in series with six R 0 Are connected in series with each other to form two R 1 Are connected in series with each other, each C 0 R is corresponding to the position 0 Parallel connection C 0 、R 0 Parallel with R 1 And (3) connecting in series.
Wherein C is 0 Representing 3. High voltage capacitor of FIG. 1, R 0 Represents 4. Equalizing resistance of FIG. 1, R 1 Representing the 1. High voltage resistor of fig. 1.
The epoxy shell can protect the high-voltage capacitor 3, the high-voltage resistor 1 and the voltage equalizing resistor 4 on the epoxy fixing plate 2 from being damaged by rain.
The high-voltage capacitor 3 is a capacitor with direct-current withstand voltage of more than 40kV and capacitance value of 24 nF.
The high-voltage resistor 1 is a thick film noninductive resistor with a resistance value of 1kΩ and is used for weakening electromagnetic oscillation and eliminating resonance overvoltage.
The equalizing resistor 4 is a thick film noninductive resistor with the resistance value of 20MΩ, and ensures the voltage equalization of each high-voltage capacitor (3) by utilizing the voltage division principle, thereby preventing the partial discharge of the high-voltage capacitor (3) when the overvoltage acts.
The C-shaped connecting piece 5, the L-shaped connecting piece 6 and the T-shaped connecting piece 7 are metal pieces with good electric conduction performance.
The epoxy shell is an epoxy glass cloth tube with the length of 1m and the thickness of 5mm and two sealed ends.
The application also provides a manufacturing method of the low partial discharge resistance-capacitance type overvoltage suppression device for the dry-type hollow paralleling reactor, which comprises the following steps:
a. coating binding posts on two sides of a high-voltage resistor 1, a high-voltage capacitor 3 and a voltage equalizing resistor 4 with sealing films, coating 2-3mm thick curing cement on the surfaces of the high-voltage resistor 1, the high-voltage capacitor 3 and the voltage equalizing resistor 4, mixing the curing cement with epoxy resin, a curing agent and fumed silica to form the coating, and compacting the coating by using a grinding tool, wherein the mixing mass ratio of the epoxy resin to the curing agent to the fumed silica is 10:3:1;
b. wrapping the surfaces of the coating layers of the high-voltage resistor 1, the high-voltage capacitor 3 and the equalizing resistor 4 by using a semi-dry glass fiber adhesive tape;
c. uniformly coating the semi-dry glass fiber adhesive tape wrapped on the surfaces of the high-voltage resistor 1, the high-voltage capacitor 3 and the equalizing resistor 4 with double H adhesives;
d. putting the high-voltage resistor 1, the high-voltage capacitor 3 and the equalizing resistor 4 coated with the double-H glue into a baking oven, baking for 2.5 hours at 70 ℃, and gradually cooling to room temperature after cooling time of 1 hour;
e. the dried high-voltage resistor 1, high-voltage capacitor 3 and equalizing resistor 4 are arranged on the epoxy fixing plate 2, on-off measurement of each part is carried out, and the epoxy fixing plate 2 can be arranged inside the insulating shell without abnormality in measurement.
The low partial discharge resistance-capacitance type overvoltage suppression device for the dry type hollow paralleling reactor is used in parallel with the hollow paralleling reactor, when bus voltage passing through the hollow paralleling reactor normally operates, the high-voltage capacitor 3 of the device is in a charging state, and rated current passes through the high-voltage resistor 1; when the hollow shunt reactor has operation overvoltage, the shunt reactor converts stored electromagnetic energy into electric energy, the electric energy is released back to a bus through an absorption loop formed by the high-voltage capacitor 3 and the high-voltage resistor 1, and the shunt reactor body is not vibrated any more, so that the shunt reactor body is protected from being damaged by the overvoltage. The device has simple structure, convenient installation and small volume, and does not occupy extra space when being arranged on the hollow shunt reactor; the device adopts the equalizing resistor 4 when guaranteeing to restrain overvoltage, can effectively reduce the partial discharge of high-voltage capacitor 3, improves the life of equipment. The high-voltage resistor 1, the high-voltage capacitor 3 and the voltage equalizing resistor 4 are coated with the insulating coating, so that the creepage distance of equipment is increased, and the safety coefficient is improved.
Claims (6)
1. A low partial discharge resistance-capacitance type overvoltage suppression device is characterized in that: comprising
An epoxy shell which is an epoxy glass cloth tube with two ends sealed;
the epoxy fixing plate (2) is a strip epoxy plate and is fixed in the epoxy shell through a fastener, and is divided into a non-slotting section (22) and a slotting section (23), wherein at least two rectangular grooves (21) which are alternately arranged along the length direction of the slotting section (23) are arranged on the slotting section;
at least two high-voltage resistors (1) which are positioned on the ungrooved section (22) of the epoxy fixing plate (2) and are distributed at intervals along the length direction of the ungrooved section (22);
the number of the high-voltage capacitors (3) is the same as that of the rectangular grooves (21), and each high-voltage capacitor (3) is respectively positioned in each rectangular groove (21) of the epoxy fixing plate (2);
the number of the equalizing resistors (4) is the same as that of the high-voltage capacitors (3), and each equalizing resistor (4) is respectively positioned on the same side of each high-voltage capacitor (3);
the lead-out terminal (8) is positioned at the outer end part of the slotted section (23) of the epoxy fixing plate (2) and is a wiring terminal with long strip holes and good conductivity; and
the connecting piece comprises at least one C-shaped connecting piece (5), two L-shaped connecting pieces (6) and at least one T-shaped connecting piece (7),
the high-voltage capacitor (3) and the voltage equalizing resistors (4) at corresponding positions are connected in parallel, L-shaped connecting pieces (6) are respectively arranged at the outer ends of the high-voltage capacitors (3) and the voltage equalizing resistors (4) at two ends, wherein the two ends of the L-shaped connecting pieces (6) close to the high-voltage resistors (1) are respectively connected with the voltage equalizing resistors (4), the high-voltage capacitors (3) and the high-voltage capacitors (3) are connected in parallel, the voltage equalizing resistors (4) and the high-voltage capacitors (3) are connected in parallel, and the high-voltage capacitors (3) are connected in parallel;
the high-voltage capacitor (3) is a capacitor with direct-current withstand voltage of more than 40kV and capacitance value of 24 nF;
the high-voltage resistor (1) is a thick film noninductive resistor with the resistance value of 1kΩ.
2. The low partial discharge resistive-capacitive overvoltage suppression device according to claim 1, wherein: the equalizing resistor (4) is a thick film noninductive resistor with the resistance value of 20MΩ.
3. The low partial discharge resistive-capacitive overvoltage suppression device according to claim 1, wherein: the C-shaped connecting piece (5), the L-shaped connecting piece (6) and the T-shaped connecting piece (7) are metal pieces with good electric conduction performance.
4. The low partial discharge resistive-capacitive overvoltage suppression device according to claim 1, wherein: the epoxy shell is an epoxy glass cloth tube with the length of 1m and the thickness of 5mm and two sealed ends.
5. A method for manufacturing a low partial discharge resistive-capacitive overvoltage suppression device according to claim 1, characterized by: the method comprises the following steps:
a. coating binding posts on two sides of a high-voltage resistor (1), a high-voltage capacitor (3) and a voltage equalizing resistor (4) with sealing films, coating a layer of solidified daub on the surfaces of the high-voltage resistor (1), the high-voltage capacitor (3) and the voltage equalizing resistor (4), and compacting the coating layers by using a grinding tool;
b. wrapping the surfaces of the coating layers of the high-voltage resistor (1), the high-voltage capacitor (3) and the equalizing resistor (4) by using a semi-dry glass fiber adhesive tape;
c. the semi-dry glass fiber adhesive tape wrapped on the surfaces of the high-voltage resistor (1), the high-voltage capacitor (3) and the equalizing resistor (4) is uniformly coated with double H adhesives;
d. putting the high-voltage resistor (1), the high-voltage capacitor (3) and the voltage equalizing resistor (4) coated with the double-H glue into a baking oven, baking for 2.5 hours at 70 ℃, and gradually cooling to room temperature after cooling time of 1 hour;
e. the high-voltage resistor (1), the high-voltage capacitor (3) and the voltage equalizing resistor (4) which are dried are arranged on the epoxy fixing plate (2), on-off measurement of each part is carried out, and the epoxy fixing plate (2) can be arranged inside the insulating shell without abnormality in measurement.
6. The method for manufacturing the low partial discharge resistive-capacitive overvoltage suppression device according to claim 5, wherein the method comprises the following steps: the curing cement is formed by mixing epoxy resin, a curing agent and fumed silica, wherein the mixing mass ratio of the epoxy resin to the curing agent to the fumed silica is 10:3:1.
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| CN110739708B (en) * | 2019-12-04 | 2023-03-21 | 国网青海省电力公司电力科学研究院 | Compensation device for +/-800 kV power transmission and transformation main equipment air load and temperature rise test system |
| CN112712966A (en) * | 2020-11-30 | 2021-04-27 | 国网安徽省电力有限公司亳州供电公司 | Resistance-capacitance voltage drop-based reactor device and manufacturing method thereof |
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| CN209626962U (en) * | 2019-04-03 | 2019-11-12 | 国网安徽省电力有限公司亳州供电公司 | A kind of resistive-capacitive overvoltage inhibition device of low partial discharge |
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| CN1409328A (en) * | 2002-10-08 | 2003-04-09 | 黄维枢 | Epoxy resin dipping fibre high voltage insulation core body |
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