CN110867842A - Overvoltage combined absorption device - Google Patents
Overvoltage combined absorption device Download PDFInfo
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- CN110867842A CN110867842A CN201911183375.5A CN201911183375A CN110867842A CN 110867842 A CN110867842 A CN 110867842A CN 201911183375 A CN201911183375 A CN 201911183375A CN 110867842 A CN110867842 A CN 110867842A
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- overvoltage
- absorption device
- resistance
- zinc oxide
- amplitude
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- 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
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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Abstract
The invention discloses an overvoltage combined absorption device, which comprises: the resistor-capacitor type zinc oxide amplitude limiting device comprises a resistor and a capacitor, wherein the resistor-capacitor type absorption device and the zinc oxide amplitude limiting device are connected in parallel, and the resistor and the capacitor are connected in series. Compared with the prior art, the embodiment can effectively absorb overvoltage through the resistance-capacitance absorption device when the circuit formed by the device needing protection generates overvoltage, and can also switch on the zinc oxide amplitude limiting device when the overvoltage amplitude is close to or exceeds the amplitude of the resistance-capacitance absorption device, so that the overvoltage energy is rapidly released, the effect of protecting the resistance-capacitance absorption device is achieved, the absorption capacity of the resistance-capacitance absorption device is improved, the phenomenon that the overvoltage amplitude exceeds the amplitude of the resistance-capacitance absorption device to cause the damage of the resistance-capacitance absorption device is prevented, the damage rate of the device is obviously reduced, and the cost of manpower and material resources is reduced.
Description
Technical Field
The invention relates to the technical field of overvoltage protection, in particular to an overvoltage combined absorption device.
Background
During the operation of an electric power system, various overvoltages can be generated due to lightning strikes on lines or equipment, the electrical operation of workers, the design defects or parameter configuration errors of the equipment, and the like, and the overvoltages can cause the insulation damage of weak insulation parts in the electric power system, cause short circuit or ground fault, cause accelerated aging of the equipment, prolong response time and reduce performance, and cause the equipment to be burned out in severe cases to cause power failure of local systems. The resistance-capacitance absorption capacity of the overvoltage combined absorption device in the traditional power grid is limited, and once the resistance-capacitance absorption device exceeds the amplitude, the resistance-capacitance absorption device is easily damaged, so that the damage rate of the device is high, and the cost of replacing manpower and material resources is high.
Disclosure of Invention
The embodiment of the invention provides an overvoltage combined absorption device, which aims to solve the problems that the resistance-capacitance absorption capacity of the overvoltage combined absorption device in the traditional power grid is limited, and once the resistance-capacitance absorption device exceeds the amplitude, the resistance-capacitance absorption device is easily damaged, so that the device damage rate is high, and the cost of replacing manpower and material resources is high.
The embodiment of the invention provides an overvoltage combined absorption device, which comprises: the resistor-capacitor type zinc oxide amplitude limiting device comprises a resistor and a capacitor, wherein the resistor-capacitor type absorption device and the zinc oxide amplitude limiting device are connected in parallel, and the resistor and the capacitor are connected in series.
In combination with one aspect, in a first possible implementation manner, the overvoltage combination absorption device is connected with two ends of a loop formed by the devices to be protected through a first protection lead and a second protection lead,
with reference to the first possible implementation manner, in a second possible implementation manner, the electrical property of the first protection wire and the electrical property of the second protection wire are both consistent with the electrical property of a loop wire in a loop formed by the device to be protected, where the electrical properties include: wire resistance, insulation properties, and capacitance values.
With reference to the first possible implementation manner, in a third possible implementation manner, the impedance of the first protection wire and the impedance of the second protection wire are both smaller than the impedance of a loop wire in a loop formed by the device to be protected.
With reference to the one aspect or the first possible implementation manner, in a fourth possible implementation manner, the overvoltage combination absorption device further includes a gap, and the gap is connected in series with the zinc oxide amplitude limiting device.
With reference to one aspect or the first possible implementation manner, in a fifth possible implementation manner, the overvoltage combination absorption device further includes a fuse, and the fuse is connected in series with a loop formed by the resistance-capacitance absorption device and the zinc oxide amplitude limiting device.
As can be seen from the above embodiments, the overvoltage combination absorbing device includes: the resistor-capacitor type zinc oxide amplitude limiting device comprises a resistor and a capacitor, wherein the resistor-capacitor type absorption device and the zinc oxide amplitude limiting device are connected in parallel, and the resistor and the capacitor are connected in series. Compared with the prior art, the embodiment can effectively absorb overvoltage through the resistance-capacitance absorption device when the circuit formed by the device needing protection generates overvoltage, and can also switch on the zinc oxide amplitude limiting device when the overvoltage amplitude is close to or exceeds the amplitude of the resistance-capacitance absorption device, so that the overvoltage energy is rapidly released, the effect of protecting the resistance-capacitance absorption device is achieved, the absorption capacity of the resistance-capacitance absorption device is improved, the phenomenon that the overvoltage amplitude exceeds the amplitude of the resistance-capacitance absorption device to cause the damage of the resistance-capacitance absorption device is prevented, the damage rate of the device is obviously reduced, and the cost of manpower and material resources is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
Fig. 1 is a schematic circuit diagram of an overvoltage combined absorption device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic circuit connection diagram of the overvoltage combined absorption device of the present invention is shown, the overvoltage combined absorption device includes: the zinc oxide amplitude limiting device comprises a resistance-capacitance absorption device 1 and a zinc oxide amplitude limiting device 2, wherein the resistance-capacitance absorption device 1 and the zinc oxide amplitude limiting device 2 are connected in parallel, the resistance-capacitance absorption device 1 comprises a resistor 13 and a capacitor 14, and the resistor 13 and the capacitor 14 are connected in series.
The overvoltage combined absorption device of the embodiment of the application is connected with two ends of a loop formed by devices to be protected through a first protection lead 11 and a second protection lead 12. After the resistance-capacitance absorption device 1 and the zinc oxide amplitude limiting device 2 are connected in parallel, two ends of a parallel loop are connected with one end of a loop formed by devices needing to be protected through a first protection lead 11, and are connected with the other end of the loop formed by the devices needing to be protected through a second protection lead 12.
The resistance-capacitance absorption device 1 comprises a resistor 13 and a capacitor 14, the resistor 13 and the capacitor 14 are connected in series, and the adopted resistance-capacitance absorption device can play a role in reducing overvoltage frequency, balancing turn-to-turn voltage distribution and improving the inter-phase overvoltage protection level. When any two phases generate overvoltage, the corresponding two-phase resistance-capacitance absorption devices release the energy of the overvoltage.
The electrical properties of the first protection wire 11 and the electrical properties of the second protection wire 12 are consistent with the electrical properties of the loop wire 16 in the loop formed by the device to be protected, and the electrical properties include: wire resistance, insulation properties, and capacitance values. Alternatively, the impedance of the first protection wire 11 and the impedance of the second protection wire 12 are both smaller than the impedance of the loop wire 16 in the loop formed by the device to be protected.
The overvoltage combined absorption device also comprises a gap 15, and the gap 15 is connected with the zinc oxide amplitude limiting device 2 in series. The zinc oxide amplitude limiting device 2 is connected in parallel beside the resistance-capacitance absorption device 1 and can protect the resistance-capacitance absorption device 1 when overvoltage exceeds the maximum allowable power frequency voltage of the resistance-capacitance absorption device 1. The maximum allowable power frequency voltage of the series gap of the zinc oxide amplitude limiting device 2 is set to be close to and slightly smaller than the amplitude of the resistance-capacitance absorption device 1, so that the branch of the zinc oxide amplitude limiting device 2 can be switched on when the overvoltage amplitude is close to or exceeds the amplitude of the resistance-capacitance absorption device 1, and the overvoltage energy is rapidly released to protect the resistance-capacitance absorption device 1.
The gap 15 is connected in series behind the zinc oxide amplitude limiting device 2 to improve the charge rate, protect the zinc oxide and reduce the residual voltage level.
The chargeability is the ratio of the maximum continuous operation voltage and the initial action voltage of the zinc oxide amplitude limiting device 2. The lower the charge rate is, the lower the continuous operation voltage of the zinc oxide amplitude limiting device 2 is much smaller than the initial action voltage, and the smaller the current of the zinc oxide amplitude limiting device 2 in long-term operation is, so that the zinc oxide amplitude limiting device has good working stability, reliability and aging resistance, and the longer the service life. The gap 15 is only energized when conducting and no current passes when not conducting. The reference voltage is not changed, the system voltage of the zinc oxide amplitude limiting device 2 with the gap 15 can not act on the zinc oxide amplitude limiting device when the zinc oxide amplitude limiting device operates at ordinary times, namely the zinc oxide amplitude limiting device 2 is not electrified when the zinc oxide amplitude limiting device operates normally, and the charge rate is greatly reduced. The aging speed of the zinc oxide amplitude limiting device 2 depends on the long-acting system working voltage, namely, the long-term charge condition of the zinc oxide amplitude limiting device 2, so that the reduction of the charge rate is beneficial to the protection of the zinc oxide amplitude limiting device 2. Namely, the damage to the zinc oxide amplitude limiting device 2 under the system working voltage in long-term operation is reduced. The zinc oxide amplitude limiting device 2 is connected with the gap 15 in series, and the gap 15 plays a role in voltage division, namely, the protection residual voltage originally added on the zinc oxide amplitude limiting device 2 is distributed to the zinc oxide amplitude limiting device 2 and the gap 15, namely, the residual voltage level of the zinc oxide amplitude limiting device 2 is reduced.
Furthermore, the overvoltage combined absorption device further comprises a fuse 3, and the fuse 3 is connected in series with a loop formed by the resistance-capacitance absorption device 1 and the zinc oxide amplitude limiting device 2.
The specific working process of the embodiment of the application is as follows: when overvoltage occurs, if the amplitude of the overvoltage does not exceed the amplitude of the resistance-capacitance absorption device 1, the high-frequency overvoltage can be effectively absorbed by the resistance-capacitance absorption device 1 no matter whether the overvoltage is high-frequency overvoltage or not, the amplitude and the frequency of the overvoltage are reduced, and turn-to-turn voltage distribution is improved. If the amplitude of the overvoltage is close to or exceeds the amplitude of the resistance-capacitance absorption device 1, the branch of the zinc oxide amplitude limiting device 2 is conducted, and the overvoltage energy is released rapidly. Thereby functioning to protect the resistance-capacitance absorber 1. The gap 15 is connected in series behind the zinc oxide amplitude limiting device 2 to improve the charge rate, protect the zinc oxide and reduce the residual voltage level. If the overvoltage which cannot be processed is met, the fuse 3 in the overvoltage combined absorption device can automatically realize the fault separation function when the resistance-capacitance absorption device 1 or the zinc oxide amplitude limiting device 2 fails.
The overvoltage which can not be processed specifically means that the voltage exceeds the maximum working voltage of the overvoltage combined absorption device, the fuse 3 fuses the melt, and then the loops of the resistance-capacitance absorption device 1 and the zinc oxide amplitude limiting device 2 are not conducted, and no current flows through. When the voltage of the fuse 3 is too large, the current is increased, and the fuse body can be fused. After the fuse 3 is fused, the resistance-capacitance absorption device 1 and the amplitude limiting device 2 are disconnected in a loop, and no current passes through, namely the resistance-capacitance absorption device and the zinc oxide lightning arrester can be protected.
As can be seen from the above embodiments, the overvoltage combination absorbing device includes: the zinc oxide amplitude limiting device comprises a resistance-capacitance absorption device 1 and a zinc oxide amplitude limiting device 2, wherein the resistance-capacitance absorption device 1 and the zinc oxide amplitude limiting device 2 are connected in parallel, the resistance-capacitance absorption device 1 comprises a resistor 13 and a capacitor 14, and the resistor 13 and the capacitor 14 are connected in series. Compared with the prior art, the embodiment not only can effectively absorb overvoltage through the resistance-capacitance absorption device 1 when the circuit formed by the device to be protected generates overvoltage, but also can switch on the zinc oxide amplitude limiting device 2 when the overvoltage amplitude is close to or exceeds the amplitude of the resistance-capacitance absorption device 1, quickly release overvoltage energy, play a role in protecting the resistance-capacitance absorption device 1, thereby improving the absorption capacity of the resistance-capacitance absorption device 1, preventing the overvoltage amplitude from exceeding the amplitude of the resistance-capacitance absorption device 1 to cause the damage of the resistance-capacitance absorption device 1, remarkably reducing the damage rate of the device and reducing the cost of manpower and material resources.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An overvoltage combined absorbing device, characterized in that the overvoltage combined absorbing device comprises: the zinc oxide amplitude limiting device comprises a resistance-capacitance absorption device (1) and a zinc oxide amplitude limiting device (2), wherein the resistance-capacitance absorption device (1) and the zinc oxide amplitude limiting device (2) are connected in parallel, the resistance-capacitance absorption device (1) comprises a resistor (13) and a capacitor (14), and the resistor (13) and the capacitor (14) are connected in series.
2. The combined overvoltage absorption device according to claim 1, wherein the combined overvoltage absorption device is connected to both ends of a loop formed by the devices to be protected via a first protection wire (11) and a second protection wire (12).
3. The overvoltage combination absorption device according to claim 2, wherein the electrical properties of the first protection conductor (11) and the electrical properties of the second protection conductor (12) are consistent with the electrical properties of a loop conductor (16) in a loop formed by the devices to be protected, the electrical properties including: wire resistance, insulation properties, and capacitance values.
4. The overvoltage combination absorption device according to claim 2, wherein the impedance of the first protection conductor (11) and the impedance of the second protection conductor (12) are each lower than the impedance of a loop conductor (16) in a loop formed by the devices to be protected.
5. The overvoltage combination absorber according to claim 1 or claim 2, further comprising a gap (15), the gap (15) being connected in series with the zinc oxide amplitude limiting device (2).
6. The overvoltage combination absorber according to claim 1 or claim 2, further comprising a fuse (3), the fuse (3) being connected in series with the circuit of the resistive-capacitive absorber (1) and the zinc oxide limiter means (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911183375.5A CN110867842A (en) | 2019-11-27 | 2019-11-27 | Overvoltage combined absorption device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911183375.5A CN110867842A (en) | 2019-11-27 | 2019-11-27 | Overvoltage combined absorption device |
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| CN110867842A true CN110867842A (en) | 2020-03-06 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208738836U (en) * | 2018-08-07 | 2019-04-12 | 国网内蒙古东部电力有限公司检修分公司 | A kind of self-disengaging overvoltage absorbing device for shunt reactor |
| CN110474314A (en) * | 2019-09-03 | 2019-11-19 | 国家电网有限公司 | A kind of shunt capacitor overvoltage absorbing device |
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2019
- 2019-11-27 CN CN201911183375.5A patent/CN110867842A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208738836U (en) * | 2018-08-07 | 2019-04-12 | 国网内蒙古东部电力有限公司检修分公司 | A kind of self-disengaging overvoltage absorbing device for shunt reactor |
| CN110474314A (en) * | 2019-09-03 | 2019-11-19 | 国家电网有限公司 | A kind of shunt capacitor overvoltage absorbing device |
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Application publication date: 20200306 |
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