CN104810817A - Low residual voltage zinc oxide arrester - Google Patents
Low residual voltage zinc oxide arrester Download PDFInfo
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- CN104810817A CN104810817A CN201510180911.1A CN201510180911A CN104810817A CN 104810817 A CN104810817 A CN 104810817A CN 201510180911 A CN201510180911 A CN 201510180911A CN 104810817 A CN104810817 A CN 104810817A
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- valve block
- section valve
- zinc oxide
- residual voltage
- safe operation
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Abstract
The invention discloses a low residual voltage zinc oxide arrester, comprising an energy absorption section valve block set (FR1) and a safe operation section valve block set (FR2) connected in series, and a discharge gap (CG), and is characterized in that an impedance element (Z) is connected between the safe operation section valve block set (FR2) and a ground terminal (D) in series, and the discharge gap (CG) is connected between two ends of the safe operation section valve block set (FR2) and the impedance element (Z) connected in parallel; the residual voltage value of the safe operation section valve block set (FR2) and the impedance element (Z) connected in series is not less than the operate value of the discharge gap (CG), and the impedance element (Z) is a resistor or an inductor. The low residual voltage zinc oxide arrester can selectively absorb the overvoltage with high frequency of not less than 1kHz, so that the service life of the zinc oxide arrester is greatly prolonged, the insulation of devices in the system is prevented from being damaged, and the operation and maintenance costs of the system is greatly reduced; the low residual voltage zinc oxide arrester can be widely applied to insulation protection of the electric power system to the devices.
Description
Technical field
The present invention relates to a kind of zinc oxide arrester, especially a kind of low residual voltage zinc oxide arrester.
Background technology
In electric power system, for protecting various electric equipment from the harm of atmospheric over-voltage or switching overvoltage, be usually connected with zinc oxide arrester (or claiming zinc oxide overvoltage protection device).Along with the operation of system; the insulation level aging reduction gradually of equipment; the weak insulator arrangement that particularly insulation level such as electric rotating machine is natively low; the equipment that these insulation levels are low is difficult to effectively be protected by zinc oxide arrester; its cause is; the zinc oxide valve plate forming various lightning arrester, by the restriction of its physical characteristic, is ensureing under the condition that zinc oxide valve plate normal safe runs, and extremely difficultly its residual voltage is down to a lower level.For addressing this problem, applicant has done some good tries and effort, as the low residual-pressure lightning arrester of one that Chinese utility model patent CN 203456214U announced on February 26th, 2014.This lightning arrester is by the energy absorption section valve block group of connecting and safe operation section valve block group, and be parallel to the discharging gap composition at safe operation section valve block group two ends, for ensureing rated voltage and the continuous operating voltage of lightning arrester when normally running, and chargeability when running, make it can safe long-time running; When there is overvoltage; discharging gap in parallel is by safe operation section valve block group short circuit; overvoltage energy is absorbed by energy absorption section valve block group; residual voltage is down to a more satisfactory magnitude of voltage; with the weak insulator arrangement in the aging and protection system of relieving system insulation; after having served as loss of voltage, discharging gap in parallel is opened, and lightning arrester recovers normal and runs.Though this lightning arrester Absorbable rod overvoltage is to the impact of protected equipment; also because of the various overvoltage of Long-term absorption; particularly to the absorption of the wider power-frequency overvoltage of fabric width; make very easily too early aging of energy absorption section valve block group wherein; or there is thermal runaway damage because its energy is excessive when absorbing the power-frequency overvoltage of wide fabric width; thus make lightning arrester lose effect, can not effectively protect the electric equipment in system again.
Summary of the invention
The technical problem to be solved in the present invention, for overcoming shortcoming part of the prior art, provides a kind of overvoltage to upper frequency to carry out the low residual voltage zinc oxide arrester of selective absorbing.
For solving technical problem of the present invention, the technical scheme adopted is: low residual voltage zinc oxide arrester comprises energy absorption section valve block group and the safe operation section valve block group of series connection, and discharging gap, particularly,
Impedance component is in series with between described safe operation section valve block group and earth terminal;
Described discharging gap is parallel to the safe operation section valve block group of described series connection and impedor two ends, for the short circuit safe operation section valve block group as superpotential frequency >=1kHz and impedance component.
Further improvement as low residual voltage zinc oxide arrester:
Preferably, the safe operation section valve block group of series connection and the operating value of impedor residual voltage value >=discharging gap; Consequent residual voltage value fluctuation is minimum, is beneficial to the insulation of proterctive equipment and the ageing of insulation of relieving system.
Preferably, impedance component is resistor, or inductor.
Relative to the beneficial effect of prior art be:
After adopting such structure, the overvoltage of the present invention's only upper frequency of right >=1kHz absorbs selectively, and the overvoltage to other frequency, mainly power-frequency overvoltage is then born by equipment.This is substantially identical with the probability that power-frequency overvoltage occurs based on high frequency overvoltage, and the superpotential peak value of high frequency is high, fabric width is narrow, though and the fabric width of power-frequency overvoltage is wider, but peak value is low, the insulation of equipment under high frequency overvoltage very easily by instantaneous breakdown, and the feature that its dielectric strength can sustain completely under power-frequency overvoltage, zinc oxide arrester and protected equipment is adopted rationally to share the superpotential technical scheme of different frequency targetedly, the life-span of zinc oxide arrester is not only made to obtain prolongation widely, also can not cause damage to the insulation of devices in system, significantly reduce the operation and maintenance cost of system.
Accompanying drawing explanation
Fig. 1 is a kind of basic structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, optimal way of the present invention is described in further detail.
See Fig. 1, being constructed as follows of low residual voltage zinc oxide arrester:
Energy absorption section valve block group FR1, safe operation section valve block group FR2, impedance component Z and earth terminal D are connected in series, and discharging gap CG is parallel to the safe operation section valve block group FR2 of series connection and the two ends of impedance component Z; Wherein, the safe operation section valve block group FR2 of series connection and the residual voltage value of impedance component Z equal the operating value of discharging gap CG, and impedance component Z is resistor (or inductor).
Energy absorption section valve block group FR1 in the present invention adopts the large through-current capacity zinc oxide valve plate of major diameter, to obtain a lower residual voltage ratio.The safe operation section valve block group FR2 of series connection and impedance component Z, when normal operation, safe operation section valve block group FR2 ensure that rated voltage of the present invention and continuous operating voltage, and chargeability when running, and ensure that the long-time running of its safety.
During use, only need the electric pressure be first applied in electric power system according to the present invention to carry out the electric parameter of selected each components and parts, the resistance value as the resistor when the present invention is used for 10kV electric pressure is 0.5 Ω (or the inductance value of inductor is 15 μ H); Again by the corresponding phase of the other end of energy absorption section valve block group FR1 of the present invention and electric power system, earth terminal D be electrically connected.
When the overvoltage of frequency >=1kHz is come interim, based on the high frequency characteristics of resistor (or inductor), the safe operation section valve block group FR2 of series connection and the residual voltage value of impedance component Z are much larger than the operating value of discharging gap CG, force discharging gap CG transient switching, by safe operation section valve block group FR2 and impedance component Z short circuit, only absorb overvoltage energy by energy absorption section valve block group FR1, and residual voltage value is down to a more satisfactory magnitude of voltage, ensure that each equipment in system, the safe operation of especially weak insulator arrangement.After having served as loss of voltage, discharging gap CG disconnects voluntarily, and the present invention recovers normal operation.
Obviously, those skilled in the art can carry out various change and modification to low residual voltage zinc oxide arrester of the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technologies thereof to these amendments of the present invention and modification, then the present invention is also intended to comprise these change and modification.
Claims (3)
1. a low residual voltage zinc oxide arrester, comprises energy absorption section valve block group (FR1) and safe operation section valve block group (FR2) of series connection, and discharging gap (CG), it is characterized in that:
Impedance component (Z) is in series with between described safe operation section valve block group (FR2) and earth terminal (D);
Described discharging gap (CG) is parallel to safe operation section valve block group (FR2) of described series connection and the two ends of impedance component (Z), for short circuit safe operation section valve block group (FR2) and impedance component (Z) as superpotential frequency >=1kHz.
2. low residual voltage zinc oxide arrester according to claim 1, is characterized in that the operating value of the residual voltage value >=discharging gap (CG) of safe operation section valve block group (FR2) and the impedance component (Z) of connecting.
3. low residual voltage zinc oxide arrester according to claim 1, is characterized in that impedance component (Z) is resistor, or inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510180911.1A CN104810817A (en) | 2015-04-16 | 2015-04-16 | Low residual voltage zinc oxide arrester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510180911.1A CN104810817A (en) | 2015-04-16 | 2015-04-16 | Low residual voltage zinc oxide arrester |
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| Publication Number | Publication Date |
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| CN104810817A true CN104810817A (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510180911.1A Pending CN104810817A (en) | 2015-04-16 | 2015-04-16 | Low residual voltage zinc oxide arrester |
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| CN (1) | CN104810817A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336562A (en) * | 2021-12-03 | 2022-04-12 | 广东电网有限责任公司 | Transformer lightning overvoltage protection device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2789896Y (en) * | 2005-04-11 | 2006-06-21 | 孔祥霖 | Electric unit structure for metal oxide lightning arrester |
| CN103048513A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Self-insurance wide-frequency voltage signal collecting device |
| CN203747409U (en) * | 2014-04-02 | 2014-07-30 | 陈静 | Intelligent terminal protection system for high energy low residual voltage protector |
| CN204517398U (en) * | 2015-04-16 | 2015-07-29 | 安徽一天电气技术有限公司 | Low residual voltage zinc oxide arrester |
-
2015
- 2015-04-16 CN CN201510180911.1A patent/CN104810817A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2789896Y (en) * | 2005-04-11 | 2006-06-21 | 孔祥霖 | Electric unit structure for metal oxide lightning arrester |
| CN103048513A (en) * | 2011-10-14 | 2013-04-17 | 安徽一天电气技术有限公司 | Self-insurance wide-frequency voltage signal collecting device |
| CN203747409U (en) * | 2014-04-02 | 2014-07-30 | 陈静 | Intelligent terminal protection system for high energy low residual voltage protector |
| CN204517398U (en) * | 2015-04-16 | 2015-07-29 | 安徽一天电气技术有限公司 | Low residual voltage zinc oxide arrester |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114336562A (en) * | 2021-12-03 | 2022-04-12 | 广东电网有限责任公司 | Transformer lightning overvoltage protection device |
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Address after: Yonghe Road, high tech Development Zone, Hefei city of Anhui Province, No. 99 230031 Applicant after: Anhui electric technology Limited by Share Ltd Address before: Yonghe Road, high tech Development Zone, Hefei city of Anhui Province, No. 99 230031 Applicant before: Anhui Yitian Electrical Technology Co., Ltd. |
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Application publication date: 20150729 |