CN110768226A - MOV overvoltage protection device based on zinc oxide nonlinear resistor - Google Patents
MOV overvoltage protection device based on zinc oxide nonlinear resistor Download PDFInfo
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- CN110768226A CN110768226A CN201911047843.6A CN201911047843A CN110768226A CN 110768226 A CN110768226 A CN 110768226A CN 201911047843 A CN201911047843 A CN 201911047843A CN 110768226 A CN110768226 A CN 110768226A
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- Prior art keywords
- zinc oxide
- mov
- nonlinear resistor
- oxide nonlinear
- overvoltage
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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
- H02H9/045—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
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- 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
- H02H7/222—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 for switches
Abstract
The invention relates to an MOV overvoltage protection device based on a zinc oxide nonlinear resistor, which comprises: zinc oxide nonlinear resistor MOV, circuit breaker K, transformer T; the MOV wire inlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the device, and the wire outlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the transformer T; the breaker K is connected in parallel with two ends of a zinc oxide nonlinear resistor MOV; and the inlet wire end of the transformer T is connected with the MOV outlet wire end of the zinc oxide nonlinear resistor, and the outlet wire end is connected with the outlet wire end of the device. The MOV overvoltage protection device based on the zinc oxide nonlinear resistor has the advantages of simple structure, safety, reliability, strong applicability and the like, the MOV is connected in parallel between the contacts of the circuit breaker, and the overvoltage related to the operation of the circuit breaker is limited to a lower level by absorbing the overvoltage energy of the system through the MOV, so that the overvoltage problem of the system is effectively solved.
Description
Technical Field
The invention relates to the technical field of overvoltage protection, in particular to an MOV overvoltage protection device based on a zinc oxide nonlinear resistor.
Background
The various insulations in the power system are subjected to short-term actions of various overvoltages which are much higher than the operating voltage in addition to the long-term actions of the operating voltage during operation, so-called "overvoltages" generally refer to the voltage rise and potential difference rise which occur in the system and are dangerous for the insulation, and the overvoltages can be divided into two types according to the generation sources, namely ① lightning overvoltage is direct lightning overvoltage and induced lightning overvoltage, and ② internal overvoltage is temporary overvoltage and operation overvoltage.
The basic principle of overvoltage protection is to discharge or consume the electromagnetic energy forming overvoltage to weaken the amplitude of overvoltage, and the main measures of the overvoltage protection are ① mounting lightning rod and lightning conductor (overhead earth wire), ② mounting lightning arrester, ③ mounting grounding device, ④ breaker parallel resistor, ⑤ arranging arc suppression coil, ⑥ mounting arrester and ⑦ mounting reactor.
Disclosure of Invention
The MOV overvoltage protection device based on the zinc oxide nonlinear resistor can solve the technical problem of system overvoltage.
In order to achieve the purpose, the invention adopts the following technical scheme:
a zinc oxide non-linear resistor based MOV overvoltage protection device comprising: zinc oxide nonlinear resistor MOV, circuit breaker K, transformer T;
the MOV wire inlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the device, and the wire outlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the transformer T;
the breaker K is connected in parallel with two ends of a zinc oxide nonlinear resistor MOV; and the inlet wire end of the transformer T is connected with the MOV outlet wire end of the zinc oxide nonlinear resistor, and the outlet wire end is connected with the outlet wire end of the device.
The zinc oxide nonlinear resistor MOV is used to limit the operating overvoltage between the contacts of the circuit breaker.
Wherein, the zinc oxide nonlinear resistor MOV can be internally provided with a fuse wire to protect the resistor MOV.
According to the technical scheme, the MOV overvoltage protection device based on the zinc oxide nonlinear resistor has the advantages of simple structure, safety, reliability, strong applicability and the like, the MOV is connected in parallel between the contacts of the circuit breaker, the overvoltage energy related to the operation of the circuit breaker is limited to a lower level by absorbing the overvoltage energy of the system through the MOV, and the overvoltage problem of the system is effectively solved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, the overvoltage protection device based on the zinc oxide nonlinear resistor MOV of the embodiment includes a zinc oxide nonlinear resistor MOV, a circuit breaker K, a transformer T; the MOV wire inlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the device, and the wire outlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the transformer T; the breaker K is connected in parallel with two ends of a zinc oxide nonlinear resistor MOV; and the inlet wire end of the transformer T is connected with the MOV outlet wire end of the zinc oxide nonlinear resistor, and the outlet wire end is connected with the outlet wire end of the device.
The zinc oxide nonlinear resistor MOV is used to limit the operating overvoltage between the contacts of the circuit breaker.
The zinc oxide nonlinear resistor MOV may have a fuse built in to protect it.
The breaker K is connected in parallel across a zinc oxide non-linear resistor MOV.
The working principle is as follows:
a zinc oxide nonlinear resistor MOV is connected in parallel between the contacts of the circuit breaker, and the overvoltage energy related to the operation of the circuit breaker is absorbed by the zinc oxide nonlinear resistor MOV, so that the overvoltage is limited to a lower level.
The following is an application case of this example:
in a certain petrochemical plant, a zinc oxide nonlinear resistor MOV (model: MOV32 multiplied by 21) is connected in parallel between contacts of a breaker (model: VS1-12/2000-40), and the overvoltage related to the operation of the breaker (model: VS1-12/2000-40) is limited within 20kV through the zinc oxide nonlinear resistor MOV, so that the overvoltage level of the system is greatly reduced, and the service life of power equipment is prolonged.
In conclusion, the invention has the advantages of simple structure, safety, reliability, strong applicability and the like, the zinc oxide nonlinear resistor MOV is connected in parallel between the contacts of the circuit breaker, the zinc oxide nonlinear resistor MOV absorbs the overvoltage energy of the system, the overvoltage related to the operation of the circuit breaker is limited to a lower level, and the overvoltage problem of the system is effectively solved.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. An MOV overvoltage protection device based on a zinc oxide nonlinear resistor is characterized in that:
the device comprises a zinc oxide nonlinear resistor MOV, a circuit breaker K and a transformer T;
the MOV wire inlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the device, the wire outlet end of the MOV wire inlet end of the zinc oxide nonlinear resistor is connected with the wire inlet end of the transformer T, and the wire outlet end of the transformer T is used as the wire outlet end of the device;
the breaker K is connected in parallel across a zinc oxide non-linear resistor MOV.
2. A zinc oxide non-linear resistor MOV overvoltage protection device in accordance with claim 1 wherein: the zinc oxide nonlinear resistor MOV incorporates a fuse for protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911047843.6A CN110768226A (en) | 2019-10-30 | 2019-10-30 | MOV overvoltage protection device based on zinc oxide nonlinear resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911047843.6A CN110768226A (en) | 2019-10-30 | 2019-10-30 | MOV overvoltage protection device based on zinc oxide nonlinear resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110768226A true CN110768226A (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911047843.6A Pending CN110768226A (en) | 2019-10-30 | 2019-10-30 | MOV overvoltage protection device based on zinc oxide nonlinear resistor |
Country Status (1)
| Country | Link |
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| CN (1) | CN110768226A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541230A (en) * | 2020-04-20 | 2020-08-14 | 国网新疆电力有限公司塔城供电公司 | Inrush current overvoltage treatment device and method |
| CN112951530A (en) * | 2021-03-29 | 2021-06-11 | 北京交通大学 | Aging-resistant composite arrester with gap for electric locomotive and motor train unit |
-
2019
- 2019-10-30 CN CN201911047843.6A patent/CN110768226A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111541230A (en) * | 2020-04-20 | 2020-08-14 | 国网新疆电力有限公司塔城供电公司 | Inrush current overvoltage treatment device and method |
| CN111541230B (en) * | 2020-04-20 | 2022-04-19 | 国网新疆电力有限公司塔城供电公司 | Inrush current overvoltage treatment device and method |
| CN112951530A (en) * | 2021-03-29 | 2021-06-11 | 北京交通大学 | Aging-resistant composite arrester with gap for electric locomotive and motor train unit |
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