CN220273320U - Resistance-capacitance overvoltage protector - Google Patents
Resistance-capacitance overvoltage protector Download PDFInfo
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- CN220273320U CN220273320U CN202321408488.2U CN202321408488U CN220273320U CN 220273320 U CN220273320 U CN 220273320U CN 202321408488 U CN202321408488 U CN 202321408488U CN 220273320 U CN220273320 U CN 220273320U
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- overvoltage protector
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- overvoltage
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- 230000001012 protector Effects 0.000 title claims abstract description 49
- 239000006096 absorbing agent Substances 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 4
- 230000032683 aging Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 238000004880 explosion Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 abstract description 6
- 239000003990 capacitor Substances 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 5
- 208000024891 symptom Diseases 0.000 abstract description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 12
- 239000011787 zinc oxide Substances 0.000 description 6
- 230000001939 inductive effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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Abstract
The utility model provides a resistive-capacitive overvoltage protector, comprising: an insulating frame. The utility model provides a resistance-capacitance overvoltage protector, which utilizes the nanosecond response speed of a resistance element material to enable the ZW-ZR30 type resistance-capacitance overvoltage protector to have extremely small current and play a role in isolating with a power grid under the normal working condition; under the action of overvoltage, the device is quickly converted into a low-resistance state of tens to hundreds of ohms, so that the ZW-ZR30 type resistance-capacitance overvoltage protector is automatically and immediately connected to a power grid, plays a role in protection, realizes the self-control functions of quick connection and quick disconnection, fully utilizes the absorption characteristic and the frequency characteristic of a capacitor, successfully inhibits the high amplitude and the high steepness of the operation overvoltage, fundamentally achieves the aim of limiting amplitude and reducing frequency-protecting equipment, treats both the symptoms and root causes, and effectively ensures the safety and the reliability of the normal operation of electrical equipment and an electric power system.
Description
Technical Field
The utility model relates to the field of resistive-capacitive overvoltage protectors, in particular to a resistive-capacitive overvoltage protector.
Background
In medium-voltage power grids, because vacuum electrical products (vacuum circuit breakers, vacuum contactors, vacuum load switches, vacuum reclosers and the like) have extremely high arc extinguishing capability, when inductive loads (generators, transformers, reactors, motors and the like) are closed and combined, cut-off of voltage, repeated re-ignition of overvoltage and three-phase simultaneous on-off overvoltage are easily caused. These operating overvoltages have the characteristics of high amplitude and high steepness (oscillation frequency is as high as several tens to several hundred KHz), and are extremely harmful to inductive loads, and are called "motor killers".
At present, various lightning arresters and combined overvoltage protectors of the same kind are used for limiting the amplitude of overvoltage by utilizing the residual voltage of a zinc oxide valve plate, limiting the amplitude and the frequency, treating the symptoms and the root causes, and cannot effectively protect equipment. And because of the relation of valve plate response speed, the shorter the overvoltage wave head time, the higher the residual voltage of the zinc oxide arrester (the residual voltage under the abrupt wave impact current is 20-35% higher than the residual voltage under the operation impact current), which makes the cooperation with the motor withstand voltage extremely difficult, the interception overvoltage and the reburning overvoltage are similar to abrupt waves, the wave head time is extremely short and less than 1 mu s, which can make the zinc oxide arrester and various combined overvoltage protectors difficult to effectively protect equipment under the action of high-gradient overvoltage, and particularly, some combined overvoltage protectors have series gaps in each phase, which are not broken down under most of the operation overvoltage, thereby losing the function of protecting the operation overvoltage.
Therefore, it is necessary to provide a resistive-capacitive overvoltage protector to solve the above technical problems.
Disclosure of Invention
The utility model provides a resistance-capacitance overvoltage protector, which solves the problems of various lightning arresters and combined overvoltage protectors of the same kind, and utilizes residual voltage of a zinc oxide valve plate to limit the amplitude of overvoltage, so that the amplitude is limited, the frequency is not limited, the symptoms are not cured, and the equipment cannot be effectively protected. And because of the relation of valve plate response speed, the shorter the overvoltage wave head time, the higher the residual voltage of the zinc oxide arrester (the residual voltage under the abrupt wave impact current is 20-35% higher than the residual voltage under the operation impact current), which makes the cooperation with the motor withstand voltage extremely difficult, the interception overvoltage and the reburning overvoltage are similar to abrupt waves, the wave head time is extremely short and less than 1 mu s, which can make the zinc oxide arrester and various combined overvoltage protectors difficult to effectively protect equipment under the action of high-gradient overvoltage, and particularly, some combined overvoltage protectors have series gaps in each phase, which are not broken down under most of the operation overvoltage, thereby losing the problem of protecting the operation overvoltage.
In order to solve the technical problems, the utility model provides a resistive-capacitive overvoltage protector, comprising: an insulating frame;
the test terminal is fixedly arranged on one side of the top of the insulating frame, a screw is fixedly arranged at the top end of the test terminal, a measuring terminal is fixedly arranged on the outer surface of the screw, and a high-voltage insulating wire is connected to the top end of the screw;
the combined type resistance-capacitance absorber is fixedly arranged on the other side of the top of the insulating frame, and the top end of the combined type resistance-capacitance absorber is provided with a connecting end;
the counter is arranged in the middle of the top of the insulating frame.
Preferably, the standard length of the high-voltage insulating wire is 5OOmm, the using unit can set up the length requirement according to the requirement, the high-voltage wire is forbidden to cross connection between phases, is forbidden to lap or close to other conductors during the using period, and the effective national standard air insulation is required to be met, so that the high-voltage wire is prevented from aging or single-phase explosion.
Preferably, the middle fixed mounting at insulator rack top has the bracing piece, the top fixed mounting of bracing piece has the bracket, the bracket has been seted up in the middle of bracket top, the equal fixed mounting in both sides of bracket inside has the connecting block, the top fixed mounting of connecting block has strutting arrangement, the equal fixed mounting in both sides of strutting arrangement inside has elastic device, elastic device's surface cover is equipped with stop device.
Preferably, the supporting device comprises a supporting ring block, and a communication hole is formed in the middle of one side of the supporting ring block.
Preferably, the elastic device comprises a fixed rod, one end of the fixed rod is fixedly provided with a limiting block, and the outer surface of the fixed rod is sleeved with a spring.
Preferably, the limiting device comprises a limiting arc plate, a setting hole is formed in the middle of one side of the limiting arc plate, and a limiting cavity is communicated with the other side of the setting hole.
Preferably, the limiting arc plate is made of insulating materials.
Compared with the related art, the resistive-capacitive overvoltage protector provided by the utility model has the following beneficial effects:
the utility model provides a resistance-capacitance overvoltage protector, which utilizes the nanosecond response speed of a resistance element material to enable the ZW-ZR30 type resistance-capacitance overvoltage protector to have extremely small current and play a role in isolating with a power grid under the normal working condition; under the action of overvoltage, the device is quickly converted into a low-resistance state of tens to hundreds of ohms, so that the ZW-ZR30 type resistance-capacitance overvoltage protector is automatically and immediately connected to a power grid, plays a role in protection, realizes the self-control functions of quick connection and quick disconnection, fully utilizes the absorption characteristic and the frequency characteristic of a capacitor, successfully inhibits the high amplitude and the high steepness of the operation overvoltage, fundamentally achieves the aim of limiting amplitude and reducing frequency-protecting equipment, treats both the symptoms and root causes, and effectively ensures the safety and the reliability of the normal operation of electrical equipment and an electric power system.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of a resistive-capacitive overvoltage protector according to the present utility model;
FIG. 2 is a schematic diagram of a second embodiment of a resistive-capacitive overvoltage protector according to the present utility model;
fig. 3 is an enlarged schematic view at a shown in fig. 2.
Reference numerals in the drawings: 1. the device comprises an insulating frame, 2, a test terminal, 3, a measuring terminal, 4, a screw rod, 5, a high-voltage insulating wire, 6, a connecting end, 7, a wiring terminal, 8, a composite resistance-capacitance absorber, 9, a counter, 10, a bracket, 11, a bracket, 12, a connecting block, 13, a supporting device, 131, a supporting ring block, 132, a communication hole, 14, an elastic device, 141, a fixing rod, 142, a spring, 143, a limiting block, 15, a limiting device, 151, a limiting arc plate, 152, a setting hole, 153, a limiting cavity, 16 and a supporting rod.
Detailed Description
The utility model will be further described with reference to the drawings and embodiments.
Referring to fig. 1 in combination, fig. 1 is a schematic structural diagram of a first embodiment of a resistive-capacitive overvoltage protector according to the present utility model. A resistive-capacitive overvoltage protector comprising: an insulating frame 1;
the test terminal 2 is fixedly arranged on one side of the top of the insulating frame 1, a screw 4 is fixedly arranged at the top end of the test terminal 2, a measuring terminal 3 is fixedly arranged on the outer surface of the screw 4, and a high-voltage insulating wire 5 is connected to the top end of the screw 4;
the combined type resistance-capacitance absorber 8 is fixedly arranged on the other side of the top of the insulating frame 1, and a connecting end 6 is arranged at the top end of the combined type resistance-capacitance absorber 8;
the counter 9 is arranged in the middle of the top of the insulating frame 1.
The joint of the top end of the measuring terminal 3 and the high-voltage insulating wire 5 is a point B, the joint of the test terminal 2 and the measuring terminal 3 is a point O, the joint of the insulating frame 1 and the counter 9 is a point N, the joint of the insulating frame 1 and the composite resistance-capacitance absorber 8 is a point D, and the connecting section 6 at the top of the wiring terminal 7 is a point A/C.
The standard length of the high-voltage insulating wire 5 is 5OOmm, the using unit can set up the length requirement according to the requirement, the high-voltage wire is forbidden to be crossed and connected during the using period, is forbidden to be lapped or is close to other conductors, and the effective national standard air insulation is required to be met, so that the high-voltage wire is prevented from aging or single-phase explosion.
The power grid often contains higher harmonics of each order, which can cause abnormal increase of the current of a capacitor loop of a common resistance-capacitance absorber and overheat of the resistor, thereby threatening the normal operation of the common resistance-capacitance absorber. The ZW-ZR30 type resistive-capacitive overvoltage protector is isolated from the power grid during normal operation or single-phase grounding abnormal operation due to the addition of the self-control access device, so that the device can work in the power grid with higher harmonic content and is suitable for the complex power grid operation environment on site.
In the practical application of the product, the ZW-ZR30 type resistive-capacitive overvoltage protector and the porcelain bushing structure type product have the advantages of reduced volume, double weight reduction due to the use of the composite material product, light weight, no space limitation in installation, use and maintenance, and convenience in use.
The ZW-ZR30 type resistive-capacitive overvoltage protector adopts a gapless structural design, and the power frequency voltage of an access power grid depends on the characteristics of solid materials.
The inter-turn potential gradient of the inductive load is in direct proportion to the current steepness (di/dt), the oscillating frequency of the operation overvoltage can reach tens to hundreds of KHZ, the steepness is extremely high, the inter-turn insulation damage to the motor and the transformer is extremely high, meanwhile, the circuit breaker is easy to be reburned, many accident examples prove that under the action of the operation overvoltage, the damaged parts of the motor and the transformer are mostly concentrated among turns, and the inter-turn of the wire inlet end is mainly used, so that the high steepness is extremely harmful to electric equipment with windings.
The oscillating frequency of the operation overvoltage can be effectively reduced, the wave head gradient can be effectively relieved, the potential gradient between windings is reduced, and the damage of high gradient to electrical equipment is successfully restrained.
Similar overvoltage protection equipment, such as lightning arresters, various combined overvoltage protectors and the like, cannot change the oscillating frequency of operation overvoltage and reduce steepness, namely: the damage caused by high steepness to inductive load turns can not be prevented.
The utility model provides a resistor-capacitor overvoltage protector, which has the following working principle:
when the device works, firstly, the A, B, C three-phase terminals of the ZW-ZR30 type self-control type resistance-capacitance overvoltage protector are respectively and continuously A, B, C three phases of protected equipment, and the grounding terminal 'N' of a target grounding symbol should be reliably grounded, for example, the single-phase and high-voltage end is connected with the incoming line of the protected equipment, and the grounding terminal 'N' should be reliably grounded.
Applying power frequency voltage between the point A of the wiring terminal 7 and the point N of the grounding terminal of the insulating frame 1, and connecting an alternating current ammeter in series, starting rising from a lower voltage, recording the indicating number of the voltmeter at the moment when the indicating number of the ammeter is 1mA, then rapidly reducing the voltage to zero, and when the voltage is reduced, the circuit cannot be cut off suddenly, wherein the recorded numerical value meets the requirements in the technical data sheet, and is qualified.
During test, the capacitance parameter is detected from the position between the O point of the test terminal 2 and the N point of the grounding terminal, the capacitance and the loss tangent value at 1kHz should be measured by adopting a digital bridge, and the capacitance value in the measurement result should meet the requirements of a technical data table, and the loss tangent value should be not more than 0.15%. Meeting the above conditions is qualified.
Compared with the related art, the resistive-capacitive overvoltage protector provided by the utility model has the following beneficial effects:
the utility model provides a resistance-capacitance overvoltage protector, which utilizes the nanosecond response speed of a resistance element material to enable the ZW-ZR30 type resistance-capacitance overvoltage protector to have extremely small current and play a role in isolating with a power grid under the normal working condition; under the action of overvoltage, the device is quickly converted into a low-resistance state of tens to hundreds of ohms, so that the ZW-ZR30 type resistance-capacitance overvoltage protector is automatically and immediately connected to a power grid, plays a role in protection, realizes the self-control functions of quick connection and quick disconnection, fully utilizes the absorption characteristic and the frequency characteristic of a capacitor, successfully inhibits the high amplitude and the high steepness of the operation overvoltage, fundamentally achieves the aim of limiting amplitude and reducing frequency-protecting equipment, treats both the symptoms and root causes, and effectively ensures the safety and the reliability of the normal operation of electrical equipment and an electric power system.
Second embodiment
Referring to fig. 2 and 3 in combination, another type of resistive-capacitive overvoltage protector is proposed in a second embodiment of the present application based on the resistive-capacitive overvoltage protector provided in the first embodiment of the present application. The second embodiment is merely a preferred manner of the first embodiment, and implementation of the second embodiment does not affect the implementation of the first embodiment alone.
Specifically, the second embodiment of the present application provides a resistance-capacitance overvoltage protector's difference lies in, a resistance-capacitance overvoltage protector, the middle fixed mounting at insulator 1 top has bracing piece 16, the top fixed mounting of bracing piece 16 has bracket 10, bracket 11 has been seted up in the centre at bracket 10 top, the inside both sides of bracket 11 are all fixed mounting has connecting block 12, the top fixed mounting of connecting block 12 has strutting arrangement 13, the inside both sides of strutting arrangement 13 are all fixed mounting has resilient means 14, the surface cover of resilient means 14 is equipped with stop device 15.
The supporting device 13 comprises a supporting ring block 131, and a communication hole 132 is formed in the middle of one side of the supporting ring block 131.
The elastic device 14 comprises a fixed rod 141, a limiting block 143 is fixedly arranged at one end of the fixed rod 141, and a spring 142 is sleeved on the outer surface of the fixed rod 141.
One end of the fixing rod 141 extends into the inner connection stopper 143 of the stopper cavity 153 through the setting hole 152.
The restoring elastic force of the spring 142 pushes the limiting arc plate 151 to the other limiting arc plate 151 side.
The limiting device 15 comprises a limiting arc plate 151, a setting hole 152 is formed in the middle of one side of the limiting arc plate 151, and a limiting cavity 153 is communicated with the other side of the setting hole 152.
The limiting arc plate 151 is arc-shaped and made of an insulating material.
The limiting arc plate 151 is made of insulating materials.
The utility model provides a resistor-capacitor overvoltage protector, which has the following working principle:
in operation, the high-voltage insulating wire 5 passes through the space between the two limiting arc plates 151, and the restoring elastic force of the spring 142 pushes the two limiting arc plates 151 to the surface of the high-voltage insulating wire 5, so that the high-voltage insulating wire 5 is wrapped.
Compared with the related art, the resistive-capacitive overvoltage protector provided by the utility model has the following beneficial effects:
the utility model provides a resistance-capacitance overvoltage protector, which can support and limit high-voltage insulated wires 5 with various sizes through the cooperation of a supporting device 13, an elastic device 14 and a limiting device 15, and keep the high-voltage insulated wires 5 stable in the high air.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (7)
1. A resistive-capacitive overvoltage protector, comprising: an insulating frame;
the test terminal is fixedly arranged on one side of the top of the insulating frame, a screw is fixedly arranged at the top end of the test terminal, a measuring terminal is fixedly arranged on the outer surface of the screw, and a high-voltage insulating wire is connected to the top end of the screw;
the combined type resistance-capacitance absorber is fixedly arranged on the other side of the top of the insulating frame, and the top end of the combined type resistance-capacitance absorber is provided with a connecting end;
the counter is arranged in the middle of the top of the insulating frame.
2. The resistive-capacitive overvoltage protector according to claim 1, wherein the standard length of the high-voltage insulated wire is 5OOmm, the use unit can set the length requirement according to the requirement, and the high-voltage wire can prevent the cross connection between phases, the lap joint or the close to other conductors during the use, and the effective national standard air insulation is satisfied, so that the high-voltage wire is prevented from aging or single-phase explosion.
3. The resistive-capacitive overvoltage protector according to claim 1, wherein a supporting rod is fixedly installed in the middle of the top of the insulating frame, a bracket is fixedly installed at the top end of the supporting rod, a bracket is arranged in the middle of the top of the bracket, connecting blocks are fixedly installed on two sides of the inside of the bracket, supporting devices are fixedly installed at the top ends of the connecting blocks, elastic devices are fixedly installed on two sides of the inside of the supporting devices, and limiting devices are sleeved on the outer surfaces of the elastic devices.
4. A resistive-capacitive overvoltage protector according to claim 3, wherein the supporting means comprises a supporting ring block, and a communication hole is provided in the middle of one side of the supporting ring block.
5. A resistive-capacitive overvoltage protector according to claim 3, wherein the elastic means comprises a fixed rod, a stopper is fixedly mounted at one end of the fixed rod, and a spring is sleeved on the outer surface of the fixed rod.
6. A resistive-capacitive overvoltage protector according to claim 3, wherein the limiting device comprises a limiting arc plate, a setting hole is formed in the middle of one side of the limiting arc plate, and a limiting cavity is communicated with the other side of the setting hole.
7. The resistive-capacitive overvoltage protector according to claim 6, wherein the limiting arc plates are made of an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321408488.2U CN220273320U (en) | 2023-06-05 | 2023-06-05 | Resistance-capacitance overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321408488.2U CN220273320U (en) | 2023-06-05 | 2023-06-05 | Resistance-capacitance overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220273320U true CN220273320U (en) | 2023-12-29 |
Family
ID=89311651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321408488.2U Active CN220273320U (en) | 2023-06-05 | 2023-06-05 | Resistance-capacitance overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220273320U (en) |
-
2023
- 2023-06-05 CN CN202321408488.2U patent/CN220273320U/en active Active
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