CN101728825A - Device for limiting peak value and rate of rise of transient recovery voltage of circuit breaker - Google Patents
Device for limiting peak value and rate of rise of transient recovery voltage of circuit breaker Download PDFInfo
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- CN101728825A CN101728825A CN200910237288A CN200910237288A CN101728825A CN 101728825 A CN101728825 A CN 101728825A CN 200910237288 A CN200910237288 A CN 200910237288A CN 200910237288 A CN200910237288 A CN 200910237288A CN 101728825 A CN101728825 A CN 101728825A
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Abstract
The invention discloses a device for limiting a peak value and the rate of rise of transient recovery voltage of a circuit breaker, which not only can limit the rate of rise of the transient recovery voltage of the circuit breaker, but also can limit the peak value of the transient recovery voltage of the circuit breaker. In the device of the invention, the two ends of the circuit breaker are connected in parallel with a capacitor and a lightning protector so as to limit the transient recovery voltage of the circuit breaker; the capacitor is connected in parallel so as to limit the rate of rise of the transient recovery voltage of the circuit breaker; and the lightning protector is connected in parallel to the two ends of the circuit breaker can limit the peak value of the transient recovery voltage of the circuit breaker.
Description
Technical field
The present invention relates to the electric power system field of electronic devices, be specifically related to the device of a kind of limiting circuit breaker rate of rise of transient recovery voltage and peak value.
Background technology
In 750kV and extra-high voltage grid, circuit breaker be most important also be one of the equipment of manufacture difficulty maximum.How improving the connecting-disconnecting function of circuit breaker, all is very important for the safe and reliable operation of 750kV and ultra high voltage system.
Transient recovery voltage of circuit breaker is the important indicator of breaking capacity of breaker.A large amount of research and analysis of experiments show.Transient recovery voltage TRV climbing and peak value are to influence the greatest factor that circuit breaker cut-offs.
When circuit is short-circuited fault, meeting short circuit current flow in the device for switching such as circuit breaker, short circuit current arrives to a certain degree greatly, when separating, the contact of circuit breaker can produce electric arc in the arc gap, when the current over-zero arc extinction, because electric capacity in the circuit, the existence of inductance, arc-gap voltage need be through a recovery process that is risen to supply voltage by arc voltage, what at first appear at the arc gap two ends in this recovery process is that the voltage with transient response is transient recovery voltage, the time that transient recovery voltage exists is shorter, has only tens microseconds to several milliseconds, but from the arc extinguishing angle, when cut-offfing short trouble, transient recovery voltage has decisive meaning.A large amount of research and analysis of experiments show that TRV climbing and peak value are to influence the greatest factor that circuit breaker cut-offs.
After circuit breaker cut-offs short trouble, can extinguish after the alternating current arc zero passage, remove outside the Pass recovery process with the arc gap medium has, also relevant with the voltage recovery process of arc gap.Fig. 1 has provided the example waveform of arc gap dielectric strength and recovery voltage, wherein Ud is an arc gap dielectric strength recovery curve, as seen from the figure: when pressing the Utrv1 curvilinear motion as if recovery voltage, the transient recovery voltage peak value is higher, and alternating current arc can not extinguish when zero passage; If recovery voltage is pressed the Utrv2 curvilinear motion, rate of rise of transient recovery voltage is higher, and alternating current arc can not extinguish when zero passage;
Therefore the recovery voltage climbing (RRRV) of circuit breaker is bigger, and peak value is high more, and then the electric arc difficulty that heals is extinguished (restriking), and its condition of work is also harsher.When rated voltage one timing of circuit breaker, the installation site of the recovery voltage of fracture and line construction parameter, circuit breaker, the inductance of electrical network main element and capacitance and spuious distributed constant etc. all have relation.
The fracture of part ac hv breaker is parallel with the very little capacitor of electric capacity, and main effect is to improve the voltage of circuit breaker fracture to distribute, though also can play the effect of limiting circuit breaker recovery voltage climbing, restriction is very limited.Under particular demands, some circuit breaker parallel connection the capacitor of several thousand pF, be used for limiting RRRV, but can not limit the peak value of recovery voltage.
In 750kV and ultra high voltage system, under some fault (as outlet fault, low coverage fault), especially under the special operational mode of first stage of construction, transient recovery voltage of circuit breaker climbing condition with higher may appear; The extensive use of mending along with string has proposed new requirement to breaking capacity of breaker simultaneously, studies show that, in the system that the installing string is mended, the transient recovery voltage of circuit breaker peak value is higher, has surpassed request of national standard under some situation.Therefore the method for studying the limiting circuit breaker transient recovery voltage is extremely important, therefore, the present invention proposes the device of a kind of limiting circuit breaker rate of rise of transient recovery voltage and peak value.
Summary of the invention
The general capacitance of circuit-breaker capacitor of the prior art is less, and the effect of limiting circuit breaker recovery voltage climbing is limited, and circuit-breaker capacitor can not limit the peak value of recovery voltage simultaneously.The objective of the invention is to propose a kind of device of limiting circuit breaker transient recovery voltage climbing that not only can the limiting circuit breaker transient recovery voltage but also can limit the peak value of transient recovery voltage in view of above deficiency.
The present invention proposes the device of a kind of limiting circuit breaker transient recovery voltage peak value and climbing, it is characterized in that: at the two ends shunt capacitor and the lightning arrester of the circuit breaker of high-voltage fence, thereby constitute the structure of circuit breaker, capacitor and lightning arrester three parallel connection, described capacitor is used to reduce the climbing of transient recovery voltage of circuit breaker, and described lightning arrester is used to reduce the peak value of transient recovery voltage of circuit breaker.
Wherein, the numerical values recited of the capacitor value of described shunt capacitor need be determined according to the concrete project situation of high-voltage fence, studies the restriction of different capacitive reactances to transient recovery voltage of circuit breaker by the method for numerical simulation, selects suitable capacitor value.
Wherein, the rated voltage of described lightning arrester will be determined according to the concrete project situation of high-voltage fence, need consider following situation when selecting the lightning arrester rated voltage: at first, described circuit breaker both end voltage is when the highest working voltage of high-voltage web system, and the phase angle of circuit breaker both end voltage differs 180 when spending, and described lightning arrester should guarantee long-time running in this state; Secondly when high-voltage web system breaks down, when circuit breaker cut-offs lightning arrester effectively the peak value of limiting circuit breaker transient recovery voltage in the allowed band of the countries concerned and industry standard, for reach this require also need be by numerical simulation method to the suitable value of lightning arrester selection.
Wherein, also to adopt different capacitor values when selecting the capacitor value of shunt capacitor capacitive reactance according to the situation of high-voltage fence different faults, in high-voltage web system generation low coverage fault and when only circuit breaker bus side only links to each other with transformer, rate of rise of transient recovery voltage is higher, and the rate of rise limit of selecting the transient recovery voltage of circuit breaker that the capacitor value of described capacitor should be able to be when these faults take place is in the countries concerned and industry standard allowed band.
Wherein, described country and industry standard comprise GB 1984-2003 " high-voltage AC breaker ", DL/T 402-2007 " high-voltage AC breaker order technical conditions ".
Wherein, the concrete project situation of described high-voltage fence comprises the system voltage grade, the arrangement of the length of transmission line, transposition form, tower structure and conductor arrangement, the high configuration that resists and go here and there compensation arrangements such as benefit, transformer station, the arrangement of transformer, the arrangement of lightning arrester, high anti-arrangement etc.
Wherein, the method for described numerical simulation comprises the electromagnetic transient simulation software EMTP-RV of electromagnetic transient simulation software PSCAD 4.2, U.S. DCG (the EMTP Development Coordination Group) distribution of electromagnetic transient simulation software EMTP, the exploitation of direct current research center, Canadian Manitoba, the power system simulation software NETOMAC of Siemens's distribution.
The invention has the beneficial effects as follows: the peak value that the device that the present invention proposes both can the limiting circuit breaker transient recovery voltage, climbing that again can the limiting circuit breaker transient recovery voltage.
Description of drawings
In order to make content of the present invention by clearer understanding, and be convenient to the description of embodiment, it is as follows to provide description of drawings related to the present invention below:
Fig. 1 shows the example waveform of arc gap dielectric strength and recovery voltage;
Fig. 2 is the structural representation according to limiting circuit breaker transient recovery voltage device of the present invention;
Fig. 3 is restriction transient recovery voltage peak effect figure, and wherein (a) is the figure that does not adopt restriction; (b) be the figure that adopts device of the present invention;
Fig. 4 is a restriction rate of rise of transient recovery voltage design sketch, and wherein (a) is the figure that does not adopt restriction; (b) be the figure that adopts device of the present invention.
Embodiment
The schematic representation of apparatus of the limiting circuit breaker transient recovery voltage that the present invention proposes is as shown in the frame of broken lines among Fig. 2.
In order to limit certain typical 750kV system's transient recovery voltage of circuit breaker peak value and climbing, the device condenser capacitance value of the present invention of design is 10000pF, lightning arrester rated voltage 972kV.
In order to select the capacitance of capacitor, when adopting the power electronics of electric power system research institute of China Electric Power Research Institute exploitation and electro-magnetic transient calculation procedure (EMTPE) 1.0 versions to calculate to adopt different capacitance, the climbing of transient recovery voltage of circuit breaker was as shown in table 2 when system was short-circuited fault.When capacitance was got 2000pF and 5000pF, the recovery voltage climbing is for being respectively 6.5kV/us and 5.3kV/us, and was all higher, surpassed or near the requirement of related standards (DL/T 402-2007 " high-voltage AC breaker order technical conditions "); When capacitance was got 10000pF, the recovery voltage climbing was 2.7kV/us, and it is limited to continue to increase the decline of capacitance recovery voltage climbing, and therefore selecting capacitance is 10000pF.
Recovery voltage climbing during the different capacitance of table 1
| Capacitance (pF) | Rate of rise of transient recovery voltage (kV/us) |
| ??2000 | ??6.5 |
| ??5000 | ??5.3 |
| ??10000 | ??2.7 |
| ??15000 | ??2.1 |
In order to select the rated voltage of lightning arrester, at first be system's ceiling voltage and differ 180 lightning arresters when spending should be able to long-term work for the circuit breaker both end voltage, the highest working voltage 800kV of 750kV system, and when phase phasic difference 180 was spent, circuit breaker both end voltage difference was to the maximum:
Lightning arrester should be able to bear the voltage that peak value is 1306kV for a long time, and according to relevant lightning arrester condition of work, the lightning arrester rated voltage should be greater than 972kV; When having adopted EMTP electromagnetic transient simulation computed in software and having adopted different lightning arrester rated voltage, the peak-peak of transient recovery voltage of circuit breaker was as shown in table 3 when system was short-circuited fault, the lightning arrester rated voltage is got 996kV, the recovery voltage peak value is higher, surpassed the requirement of related standards (DL/T 402-2007 " high-voltage AC breaker order technical conditions "), therefore choosing the lightning arrester rated voltage is 972kV.
Recovery voltage climbing during the different lightning arrester rated voltage of table 2
| Lightning arrester rated voltage (kV) | Transient recovery voltage peak value (kV) |
| ??972 | ??1632.1 |
| ??996 | ??1702.6 |
Table 3 has compared behind the device that typical 750kV system circuit breaker adopts the invention described above the transient recovery voltage result of calculation when not adopting restriction.When taking place, the outlet fault climbing of transient recovery voltage of circuit breaker can be reduced by 64% as can be seen by the result; Drop under the situation that string mends, can be with the peak value reduction by 19.6% of the transient recovery voltage of long line fault.
Certain 750kV system line circuit breaker of table 3 adopts the transient recovery voltage after this method
Fig. 3 (a) is not when adopting device of the present invention, the waveform of transient recovery voltage of circuit breaker peak-peak, Fig. 3 (b) are after adopting above-mentioned device, the waveform of transient recovery voltage of circuit breaker peak-peak, after can seeing this device of employing, the transient recovery voltage peak value reduces greatly.
Fig. 4 (a) is not when adopting device of the present invention, the waveform of transient recovery voltage of circuit breaker maximum climbing, Fig. 3 (b) is for after adopting above-mentioned device, the waveform of transient recovery voltage of circuit breaker maximum climbing, after can seeing this device of employing, the transient recovery voltage of circuit breaker climbing also reduces greatly.
Above by special embodiment content description the present invention, but those skilled in the art also can recognize the multiple possibility of modification and optional embodiment, for example, by combination and/or change the feature of single embodiment.Therefore, be understandable that these modification and optional embodiment will be considered as included among the present invention, only enclosed patent claims of scope of the present invention and coordinate restriction thereof.
Claims (7)
1. the device of limiting circuit breaker transient recovery voltage peak value and climbing, it is characterized in that: at the two ends shunt capacitor and the lightning arrester of the circuit breaker of high-voltage fence, thereby constitute the structure of circuit breaker, capacitor and lightning arrester three parallel connection, described capacitor is used to reduce the climbing of transient recovery voltage of circuit breaker, and described lightning arrester is used to reduce the peak value of transient recovery voltage of circuit breaker.
2. device as claimed in claim 1, the numerical values recited that it is characterized in that the capacitor value of described shunt capacitor need be determined according to the concrete project situation of high-voltage fence, study the restriction of different capacitive reactances by the method for numerical simulation, select suitable capacitor value transient recovery voltage of circuit breaker.
3. as the described device of claim 1-2, it is characterized in that:
The rated voltage of described lightning arrester will be determined according to the concrete project situation of high-voltage fence, need consider following situation when selecting the lightning arrester rated voltage: at first, described circuit breaker both end voltage is when the highest working voltage of high-voltage web system, and the phase angle of circuit breaker both end voltage differs 180 when spending, and described lightning arrester should guarantee long-time running in this state; Secondly when high-voltage web system breaks down, when circuit breaker cut-offs lightning arrester effectively the peak value of limiting circuit breaker transient recovery voltage in the allowed band of the countries concerned and industry standard, for reach this require also need be by numerical simulation method to the suitable value of lightning arrester selection.
4. device as claimed in claim 2, also to adopt different capacitor values when it is characterized in that selecting the capacitor value of shunt capacitor capacitive reactance according to the situation of high-voltage fence different faults, in high-voltage web system generation low coverage fault and when only circuit breaker bus side only links to each other with transformer, rate of rise of transient recovery voltage is higher, and the rate of rise limit of selecting the transient recovery voltage of circuit breaker that the capacitor value of described capacitor should be able to be when these faults take place is in the countries concerned and industry standard allowed band.
5. as the described device of claim 1-4, it is characterized in that described country and industry standard comprise GB 1984-2003 " high-voltage AC breaker ", DL/T 402-2007 " high-voltage AC breaker order technical conditions ".
6. as the described device of claim 1-5, the concrete project situation that it is characterized in that described high-voltage fence comprises the system voltage grade, the arrangement of the length of transmission line, transposition form, tower structure and conductor arrangement, the high configuration that resists and go here and there compensation arrangements such as benefit, transformer station, the arrangement of transformer, the arrangement of lightning arrester, high anti-arrangement etc.
7. as the described device of claim 1-6, it is characterized in that the method for described numerical simulation comprises the electromagnetic transient simulation software EMTP-RV of electromagnetic transient simulation software PSCAD 4.2, U.S. DCG (the EMTPDevelopment Coordination Group) distribution of electromagnetic transient simulation software EMTP, the exploitation of direct current research center, Canadian Manitoba, the power system simulation software NETOMAC of Siemens's distribution.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910237288A CN101728825A (en) | 2009-11-13 | 2009-11-13 | Device for limiting peak value and rate of rise of transient recovery voltage of circuit breaker |
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| CN200910237288A CN101728825A (en) | 2009-11-13 | 2009-11-13 | Device for limiting peak value and rate of rise of transient recovery voltage of circuit breaker |
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| CN101728825A true CN101728825A (en) | 2010-06-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197123A (en) * | 2013-03-19 | 2013-07-10 | 中国西电电气股份有限公司 | Method of computing synthetic test attenuation-type recovery voltage |
| CN103854887A (en) * | 2012-11-29 | 2014-06-11 | 株式会社日立制作所 | Gas circuit breaker with parallel capacitor |
| CN104779600A (en) * | 2015-05-07 | 2015-07-15 | 国家电网公司 | Over-voltage protection method achieved by adoption of dry-type air-core shunt reactor combined over-voltage protection circuit |
| CN105388415A (en) * | 2015-11-10 | 2016-03-09 | 中国电力科学研究院 | Two-segment-time-scale-based breaking TRV capability evaluation method of circuit breaker |
| CN106129957A (en) * | 2016-07-01 | 2016-11-16 | 广州供电局有限公司 | A kind of circuit structure cut-offfing short circuit current based on paralleling switch device |
| CN107478986A (en) * | 2017-08-29 | 2017-12-15 | 国家电网公司 | Method for determining breaker nonuniformity coefficient and correcting divider measurement result |
-
2009
- 2009-11-13 CN CN200910237288A patent/CN101728825A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103854887A (en) * | 2012-11-29 | 2014-06-11 | 株式会社日立制作所 | Gas circuit breaker with parallel capacitor |
| CN103854887B (en) * | 2012-11-29 | 2016-01-27 | 株式会社日立制作所 | With the gas path breaker of shunt capacitor |
| CN103197123A (en) * | 2013-03-19 | 2013-07-10 | 中国西电电气股份有限公司 | Method of computing synthetic test attenuation-type recovery voltage |
| CN104779600A (en) * | 2015-05-07 | 2015-07-15 | 国家电网公司 | Over-voltage protection method achieved by adoption of dry-type air-core shunt reactor combined over-voltage protection circuit |
| CN105388415A (en) * | 2015-11-10 | 2016-03-09 | 中国电力科学研究院 | Two-segment-time-scale-based breaking TRV capability evaluation method of circuit breaker |
| CN106129957A (en) * | 2016-07-01 | 2016-11-16 | 广州供电局有限公司 | A kind of circuit structure cut-offfing short circuit current based on paralleling switch device |
| CN107478986A (en) * | 2017-08-29 | 2017-12-15 | 国家电网公司 | Method for determining breaker nonuniformity coefficient and correcting divider measurement result |
| CN107478986B (en) * | 2017-08-29 | 2019-10-29 | 国家电网有限公司 | Method for determining breaker nonuniformity coefficient and correcting divider measurement result |
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Application publication date: 20100609 |