CN117458416A - Transformation method of three-phase combined overvoltage protector - Google Patents
Transformation method of three-phase combined overvoltage protector Download PDFInfo
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- CN117458416A CN117458416A CN202311193148.7A CN202311193148A CN117458416A CN 117458416 A CN117458416 A CN 117458416A CN 202311193148 A CN202311193148 A CN 202311193148A CN 117458416 A CN117458416 A CN 117458416A
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- 230000001012 protector Effects 0.000 title claims abstract description 59
- 238000011426 transformation method Methods 0.000 title claims abstract description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 49
- 230000009471 action Effects 0.000 claims abstract description 45
- 239000011787 zinc oxide Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 23
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000004945 silicone rubber Substances 0.000 claims abstract description 10
- 239000013078 crystal Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 210000003128 head Anatomy 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 210000001331 nose Anatomy 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000009420 retrofitting Methods 0.000 claims 9
- 238000004880 explosion Methods 0.000 abstract description 3
- 230000000007 visual effect Effects 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000009413 insulation Methods 0.000 description 12
- 230000006872 improvement Effects 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000002715 modification method Methods 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/044—Physical layout, materials not provided for elsewhere
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/20—Bus-bar or other wiring layouts, e.g. in cubicles, in switchyards
- H02B1/202—Cable lay-outs
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/24—Circuit arrangements for boards or switchyards
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
- H02B1/32—Mounting of devices therein
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a transformation method of a three-phase combined overvoltage protector, which relates to the technical field of power systems and comprises the following steps: s1: the method comprises the steps of manufacturing a protection unit of an overvoltage protector by adopting a zinc oxide piezoresistor, adopting a double-sealing process structure, coating the protection unit with a synthetic silicone rubber jacket, and leading out an external connection wire by adopting a high-voltage insulating silicone rubber cable; the unit for preparing the protector by adopting the zinc oxide piezoresistor with excellent performance and the double-sealing process structure has the characteristics of flame retardance, moisture resistance, explosion resistance and small volume, is more durable, is provided with the overvoltage action counter on the cabinet body, is connected with the network cable crystal head of the CT box through the RJ45 interface, has the visual overvoltage action counter function, provides a basis for judging phase-to-phase and phase-to-ground protection, is favorable for preventing equipment from being damaged by operation overvoltage and atmospheric overvoltage, and maintains the safe operation of electrical equipment.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a transformation method of a three-phase combined overvoltage protector.
Background
The vacuum circuit breaker is widely applied to the opening and closing of a high-voltage switch cabinet, has the advantages of good arc extinguishing effect, frequent operation permission, small stroke of a contact and high action speed compared with other circuit breakers, is very easy to generate operation overvoltage including interception overvoltage, multiple re-ignition overvoltage and holding overvoltage and the like, and the operation overvoltage generated during opening and closing of the vacuum circuit breaker can endanger the insulation of electrical equipment and further cause electrical accidents, so an overvoltage protection device is generally arranged, and the overvoltage protection device is mainly applied to the insulation of electrical equipment such as a generator, a transformer, a switch, a bus, a motor and the like to avoid overvoltage damage;
after the service time of the overvoltage protector in the high-voltage switch cabinet is long, an aging phenomenon can occur (the normal service life of the normally used protector which is not subjected to overvoltage impact is 5-8 years), the structure is in a series gap type, the gap is formed by zinc oxide resistor pieces, the gap cannot be sealed under vacuum due to the process reasons, air leakage can be caused, moisture or moisture can enter, in the long-term use process, the zinc oxide valve pieces are aged, air is arranged between the gap, the phenomenon of moisture absorption can occur due to long-time discharge expansion, the normal operation of electrical equipment is extremely threatened, and due to the introduction of the series gap overvoltage structure, parasitic capacitance and stray capacitance exist on the ground, and great potential safety hazards are caused to power supply equipment.
Disclosure of Invention
In view of the above problems, the invention provides a transformation method of a three-phase combined overvoltage protector, which can effectively limit the amplitude of overvoltage below the insulation tolerance level of electrical equipment, protect the insulation of the electrical equipment and maintain the safe operation of the electrical equipment.
In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a transformation method of a three-phase combined overvoltage protector comprises the following steps:
s1: the method comprises the steps of manufacturing a protection unit of an overvoltage protector by adopting a zinc oxide piezoresistor, adopting a double-sealing process structure, coating the protection unit with a synthetic silicone rubber jacket, and leading out an external connection wire by adopting a high-voltage insulating silicone rubber cable;
s2: applying 0.75 times of direct current 1mA to two ends of the protector, and detecting whether the reference voltage and the leakage current flowing through the protector meet the standards or not;
s3: selecting an overvoltage action counter integrating data acquisition and display, reserving an RJ45 interface, and fixing the overvoltage action counter and the interface according to two round holes formed in a high-voltage switch cabinet body on site;
s4: installing an overvoltage protector, fixing a plastic base in a cabinet body by using foundation bolts, respectively connecting three high-voltage cables at A, B, C ends according to marks, and connecting a grounding end with a grounding busbar by using copper wires;
s5: the CT boxes are respectively sleeved on the high-voltage insulating silicon rubber cables according to A, B, C, the network cable crystal heads of the CT boxes are connected with RJ45 interfaces of the action counter, and then the cables are adjusted.
The further improvement is that: in the step S1, a zinc oxide varistor which has a 2ms current capacity and withstands a large current surge level of 4/10us is selected.
The further improvement is that: in the step S1, a full-sealing structure is manufactured, and no metal except for the connecting terminal of the cable terminal is exposed.
The further improvement is that: in the step S2, the direct current 1mA reference voltage is not less than 22KV, and the leakage current flowing through the protector is not more than 50uA.
The further improvement is that: in the step S3, the overvoltage action counter is used for providing basis for judging protection between phases and ground.
The further improvement is that: in the step S3, an overvoltage action counter with a passive design is selected, a battery is attached to the body, a power supply is not externally connected, and a real-time power saving mode is adopted.
The further improvement is that: in the step S3, the overvoltage action counter is provided with a data processing unit, an anti-interference unit and a software digital filtering conditioning circuit, and is used for recording the action times among the three phases of the overvoltage protector in real time, attaching a flash rom, and accumulating and displaying the historical action times in a split phase mode.
The further improvement is that: in the step S4, the grounding end is connected to the grounding busbar by copper wires with the wire diameter not less than 25 mm.
The further improvement is that: in the step S5, the cable adjustment specifically includes: the distance between the two connecting wire noses exposed at the outer end of the cable is controlled to be the minimum safety distance which is required to be kept between different phase live conductors with different voltage levels in the electric power standard.
The further improvement is that: when the lengths of the cables are adaptively selected according to the installation position space and are regularly fixed, the phase cables are bundled and fixed on the same-phase bus, so that the cables with different phases are prevented from being bundled together.
The beneficial effects of the invention are as follows:
1. the invention adopts the zinc oxide piezoresistor with excellent performance and the unit of the protector prepared by the double-sealing process structure, has the characteristics of flame retardance, moisture resistance, explosion resistance and small volume, is more durable, is provided with an overvoltage action counter on a cabinet body, is connected with the network cable crystal head of a CT box through an RJ45 interface, has the visual overvoltage action counter function, provides a basis for judging the protection between phases and ground, is convenient for the insulation between the phases and between the ground of 35KV and below, and is convenient for the insulation between the phases and between the high-voltage motor, the transformer, the parallel compensation capacitor, the switch, the cable and other equipment and is free from the damage of operation overvoltage and atmospheric overvoltage, and the amplitude of the overvoltage can be effectively limited below the insulation tolerance level of the electrical equipment, thereby protecting the insulation of the electrical equipment and maintaining the safe operation of the electrical equipment.
2. The invention is beneficial to preventing electric accidents caused by operation overvoltage and resonance overvoltage, reducing loss and improving enterprise profit.
Drawings
FIG. 1 is a schematic diagram of an overvoltage protector of the present invention;
fig. 2 is a schematic diagram of an installation position of an overvoltage action counter according to the present invention.
Detailed Description
The present invention will be further described in detail with reference to the following examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1
According to fig. 1 and 2, the embodiment provides a modification method of a three-phase combined overvoltage protector, which comprises the following steps:
the method comprises the steps of manufacturing a protection unit of an overvoltage protector by adopting a zinc oxide piezoresistor, selecting the zinc oxide piezoresistor which has a 2ms through-current capacity and tolerates a 4/10us high-current impact level, adopting a double-sealing process structure, coating the protection unit by adopting a synthetic silicone rubber jacket, and leading out an external connection wire by adopting a high-voltage insulating silicone rubber cable; the cable is manufactured into a full-sealed structure, and no metal except for the connecting terminal of the cable terminal is exposed;
applying 0.75 times of direct current 1mA to two ends of the protector, and detecting whether the reference voltage and the leakage current flowing through the protector meet the standards or not; the direct current 1mA reference voltage is not less than 22KV, and the leakage current flowing through the protector is not more than 50uA;
selecting an overvoltage action counter integrating data acquisition and display, reserving an RJ45 interface, and fixing the overvoltage action counter and the interface according to two round holes formed in a high-voltage switch cabinet body on site; the overvoltage action counter is used for providing basis for judging phase-to-phase and phase-to-ground protection; an overvoltage action counter with a passive design is selected, a battery is attached to the body, a power supply is not externally connected, and a real-time power saving mode is adopted; the overvoltage action counter is provided with a data processing unit, an anti-interference unit and a software digital filtering conditioning circuit, and is used for recording the action times among the three phases of the overvoltage protector in real time, attaching a flash rom, and accumulating and displaying the historical action times in a split-phase mode;
installing an overvoltage protector, fixing a plastic base in a cabinet body by using foundation bolts, respectively connecting three high-voltage cables at A, B, C ends according to marks, and connecting a grounding end at a grounding busbar by using copper wires with the wire diameter not less than 25 mm;
the CT box is sleeved on the high-voltage insulating silicon rubber cable according to A, B, C, the network cable crystal head of the CT box is connected with an RJ45 interface of the action counter, and then the cable adjustment is carried out, specifically: the distance between the connecting wire noses exposed at the outer ends of the cables is controlled in the electric power standard, the minimum safety distance which is required to be kept between different phase live conductors with different voltage levels is controlled, the lengths of the cables are adaptively selected according to the installation position space, and when the cables are regularly fixed, the phase cables are bundled and fixed on the same phase bus, so that the cables with different phases are prevented from being bundled together.
The invention can protect electrical equipment; (overvoltage can have adverse effects on electrical equipment such as breakdown, burn-out, etc.); the stability of the power system is ensured; (overvoltage can cause voltage fluctuations and current imbalances in the power system); the electric energy quality is improved; (overvoltage causes problems of harmonics, electromagnetic interference, etc. in the power system); and the maintenance cost is reduced. (damage to electrical equipment from overvoltage can lead to equipment failure and damage, requiring repair and replacement, and increasing maintenance costs).
Example two
According to fig. 1 and 2, the embodiment provides a modification method of a three-phase combined overvoltage protector, which comprises the following steps:
the zinc oxide piezoresistor with excellent performance has the advantages of large 2ms through-flow capacity, excellent volt-ampere characteristic, small residual voltage ratio, high 4/10us high current impact resistance level and the like; the action voltage is proper and reliable.
The double-sealing process structure is adopted, all units of the protector are synthetic silicone rubber jackets, external connection wires are led out by adopting high-voltage insulating silicone rubber cables, and the protector is of a full-sealing structure, and no metal is exposed except for a terminal of a cable; flame-retardant, explosion-proof, small.
The direct current 1mA reference voltage is not less than 22KV; a reference voltage of 0.75 times direct current 1mA is applied to two ends of the protector, and leakage current flowing through the protector is not more than 50uA.
The device has the intuitive overvoltage action counter function, provides a basis for judging the protection between phases and ground, and specifically comprises the following steps: the overvoltage action counter is of an integrated structure, data acquisition and display are integrated, the overvoltage action counter and the data acquisition and display are connected through an RJ45 interface by using a network cable, and two round holes with diameters of 6mm and 20mm are formed in the cabinet body according to the site and are used for fixing the overvoltage action counter and the network cable insertion interface; the overvoltage action counter is of a passive design, an external power supply is not needed, and because the software design adopts a real-time power saving mode, the body can be used for three years with a high-performance battery, and the battery cabin is simple and convenient to replace the battery; the overvoltage action counter adopts a self-designed high-speed data processing unit, has strong anti-interference capability, and can accurately record the action times among three phases of the overvoltage protector in real time by a software digital filtering conditioning circuit. A rapid flash rom is attached, and historical action times are displayed in a split-phase accumulating mode; the overvoltage action counter is designed according to the structure, is extremely simple to install on the overvoltage action counter, does not need to move any structure, and can be additionally installed on any already operated overvoltage protection device.
When the overvoltage protector is installed, the plastic base of the overvoltage protector is fixed by the foundation bolt, the base is directly fixed on the metal bottom plate or the underframe, three high-voltage cables are respectively connected to the A, B, C end according to marks, and the grounding end is connected to the grounding busbar of the switch cabinet by copper wires with the wire diameter not less than 25mm < 2 >.
The CT boxes are respectively sleeved on the high-voltage insulating silicon rubber cables according to A, B, C, and the net wire crystal heads of the CT boxes are connected with the action counter sockets. The distance between the exposed connecting wire noses at the outer ends of the cables meets the requirement of minimum safety distance maintained between different phase live conductors of different voltage levels. The length of the protector high-voltage cable is selected according to the installation position, the length is proper, the phase cable can be bound and fixed on the same-phase bus when the length is too long, and binding of different phase cables is forbidden.
Overvoltage protectors are classified into two categories according to the body structure at the time of manufacture: a gapless combined overvoltage protector and a series gap combined overvoltage protector. The principle of the gapless combined overvoltage protector is as follows: each protection unit of the protector consists of a zinc oxide (ZnO) resistor disc and is directly connected with a three-phase power supply. Thus, good nonlinearity of the zinc oxide resistor sheet can be fully exhibited. Before the overvoltage does not reach the action voltage of the ZnO resistor disc, the ZnO resistor is in a high-resistance state, and the capacitance and the damping performance of the ZnO resistor can alleviate the steepness of the overvoltage wave head and alleviate the oscillation frequency. When the overvoltage exceeds a critical value, the ZnO resistor is in a low-resistance state (note: not in a conducting state), and the nonlinearity of the ZnO resistor is used for limiting the overvoltage of the system. The principle of the series gap combined overvoltage protector is as follows: each protection unit of the protector is composed of a discharge gap and a zinc oxide resistor disc which are connected in series. When the overvoltage reaches the discharge voltage of the protector, the discharge gap breaks down and discharges, and the zinc oxide resistor is in a low-resistance state; after overvoltage shock wave, the nonlinear characteristic of the zinc oxide resistor enables the discharge gap to be immediately quenched after discharge, no follow current is generated, the zinc oxide resistor is in a high-resistance state, and the charging rate of the zinc oxide resistor after discharge is zero.
The invention adopts the zinc oxide piezoresistor with excellent performance and the unit of the protector prepared by the double-sealing process structure, has the characteristics of flame retardance, moisture resistance, explosion resistance and small volume, is more durable, is provided with an overvoltage action counter on a cabinet body, is connected with the network cable crystal head of a CT box through an RJ45 interface, has the visual overvoltage action counter function, provides a basis for judging the protection between phases and ground, is convenient for the insulation between the phases and between the ground of 35KV and below, and is convenient for the insulation between the phases and between the high-voltage motor, the transformer, the parallel compensation capacitor, the switch, the cable and other equipment and is free from the damage of operation overvoltage and atmospheric overvoltage, and the amplitude of the overvoltage can be effectively limited below the insulation tolerance level of the electrical equipment, thereby protecting the insulation of the electrical equipment and maintaining the safe operation of the electrical equipment. The invention is beneficial to preventing electric accidents caused by operation overvoltage and resonance overvoltage, reducing loss and improving enterprise profit.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The transformation method of the three-phase combined overvoltage protector is characterized by comprising the following steps of:
s1: the method comprises the steps of manufacturing a protection unit of an overvoltage protector by adopting a zinc oxide piezoresistor, adopting a double-sealing process structure, coating the protection unit with a synthetic silicone rubber jacket, and leading out an external connection wire by adopting a high-voltage insulating silicone rubber cable;
s2: applying 0.75 times of direct current 1mA to two ends of the protector, and detecting whether the reference voltage and the leakage current flowing through the protector meet the standards or not;
s3: selecting an overvoltage action counter integrating data acquisition and display, reserving an RJ45 interface, and fixing the overvoltage action counter and the interface according to two round holes formed in a high-voltage switch cabinet body on site;
s4: installing an overvoltage protector, fixing a plastic base in a cabinet body by using foundation bolts, respectively connecting three high-voltage cables at A, B, C ends according to marks, and connecting a grounding end with a grounding busbar by using copper wires;
s5: the CT boxes are respectively sleeved on the high-voltage insulating silicon rubber cables according to A, B, C, the network cable crystal heads of the CT boxes are connected with RJ45 interfaces of the action counter, and then the cables are adjusted.
2. The method for retrofitting a three-phase combined overvoltage protector according to claim 1, wherein: in the step S1, a zinc oxide varistor which has a 2ms current capacity and withstands a large current surge level of 4/10us is selected.
3. The method for retrofitting a three-phase combined overvoltage protector according to claim 2, wherein: in the step S1, a full-sealing structure is manufactured, and no metal except for the connecting terminal of the cable terminal is exposed.
4. The method for retrofitting a three-phase combined overvoltage protector according to claim 1, wherein: in the step S2, the direct current 1mA reference voltage is not less than 22KV, and the leakage current flowing through the protector is not more than 50uA.
5. The method for retrofitting a three-phase combined overvoltage protector according to claim 1, wherein: in the step S3, the overvoltage action counter is used for providing basis for judging protection between phases and ground.
6. The method for retrofitting a three-phase combined overvoltage protector according to claim 5, wherein: in the step S3, an overvoltage action counter with a passive design is selected, a battery is attached to the body, a power supply is not externally connected, and a real-time power saving mode is adopted.
7. The method for retrofitting a three-phase combined overvoltage protector according to claim 6, wherein: in the step S3, the overvoltage action counter is provided with a data processing unit, an anti-interference unit and a software digital filtering conditioning circuit, and is used for recording the action times among the three phases of the overvoltage protector in real time, attaching a flash rom, and accumulating and displaying the historical action times in a split phase mode.
8. The method for retrofitting a three-phase combined overvoltage protector according to claim 1, wherein: in the step S4, the grounding end is connected to the grounding busbar by copper wires with the wire diameter not less than 25 mm.
9. The method for retrofitting a three-phase combined overvoltage protector according to claim 1, wherein: in the step S5, the cable adjustment specifically includes: the distance between the two connecting wire noses exposed at the outer end of the cable is controlled to be the minimum safety distance which is required to be kept between different phase live conductors with different voltage levels in the electric power standard.
10. The method for retrofitting a three-phase combined overvoltage protector according to claim 9, wherein: when the lengths of the cables are adaptively selected according to the installation position space and are regularly fixed, the phase cables are bundled and fixed on the same-phase bus, so that the cables with different phases are prevented from being bundled together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311193148.7A CN117458416A (en) | 2023-09-15 | 2023-09-15 | Transformation method of three-phase combined overvoltage protector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311193148.7A CN117458416A (en) | 2023-09-15 | 2023-09-15 | Transformation method of three-phase combined overvoltage protector |
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| CN117458416A true CN117458416A (en) | 2024-01-26 |
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| CN202311193148.7A Pending CN117458416A (en) | 2023-09-15 | 2023-09-15 | Transformation method of three-phase combined overvoltage protector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117691541A (en) * | 2024-02-04 | 2024-03-12 | 安徽辉达电力科技有限公司 | Explosion-proof overvoltage protector |
-
2023
- 2023-09-15 CN CN202311193148.7A patent/CN117458416A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117691541A (en) * | 2024-02-04 | 2024-03-12 | 安徽辉达电力科技有限公司 | Explosion-proof overvoltage protector |
| CN117691541B (en) * | 2024-02-04 | 2024-04-26 | 安徽辉达电力科技有限公司 | Explosion-proof overvoltage protector |
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