CN102074948A - System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system - Google Patents
System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system Download PDFInfo
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- CN102074948A CN102074948A CN2011100233737A CN201110023373A CN102074948A CN 102074948 A CN102074948 A CN 102074948A CN 2011100233737 A CN2011100233737 A CN 2011100233737A CN 201110023373 A CN201110023373 A CN 201110023373A CN 102074948 A CN102074948 A CN 102074948A
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Abstract
本发明涉及一种限制特高压交流输电系统中过电压的系统，属于高电压输电技术领域。该系统包括用于对高压交流输电系统中的电压进行升高或降低，并对高压交流输电系统中的能量传输进行控制的第一变电站和第二变电站，用于远距离传输电能的输电线路，输电线路上设有多组避雷器，避雷器采用具有优异伏安特性的低残压避雷器，本发明系统在降低现有的过电压水平的同时，更好的保护变电站内的设备，降低对设备的绝缘要求，从而降低设备的制造成本与制造难度；可以取消合闸电阻在断路器中的使用，从而延长设备的使用寿命，提高系统的工作可靠性。
The invention relates to a system for limiting overvoltage in an ultra-high voltage AC power transmission system, belonging to the technical field of high voltage power transmission. The system includes a first substation and a second substation for raising or lowering voltage in a high-voltage alternating current transmission system and controlling energy transmission in the high-voltage alternating current transmission system, a transmission line for long-distance transmission of electric energy, There are multiple sets of arresters on the transmission line, and the arresters are low residual voltage arresters with excellent volt-ampere characteristics. The system of the present invention can better protect the equipment in the substation while reducing the existing overvoltage level, and reduce the insulation of the equipment. Requirements, thereby reducing the manufacturing cost and difficulty of the equipment; the use of the closing resistor in the circuit breaker can be eliminated, thereby prolonging the service life of the equipment and improving the working reliability of the system.
Description
Technical field
The present invention relates to superpotential system in a kind of restriction ultra-high voltage AC transmission system, belong to the high-tension transmission technical field.
Background technology
Overvoltage and protection thereof are one of key issues of electric power system, and for the ultra-high voltage AC transmission system, this problem is particularly outstanding.
The defeated key factor that becomes technical development of the China of restriction at present extra-high-voltage alternating current is that switching overvoltage and lightning overvoltage level are too high, because the overvoltage level of system is to the lectotype selection and the device fabrication decisive role of ultra high voltage, too high overvoltage level can cause the development of extra-high voltage equipment to exist technical bottleneck, cost too high.For ultra high voltage system operation overvoltage, adopt circuit breaker to install switching-on resistance additional at present and the coefficient mode of zinc oxide arrester limits, as shown in Figure 1.Being the circuit breaker of band switching-on resistance in the frame of broken lines wherein, is common lightning arrester and reach the lightning arrester of arranging at the circuit two ends in transformer station.Although this mode can reduce switching overvoltage dramatically, the overvoltage Limiting level (1.6-1.7p.u.) that it reaches requires still very harsh for the insulation level of extra-high voltage equipment.And breaker closing resistance spoilage is higher, costs an arm and a leg, and electric power system tends to cancel switching-on resistance.For lightning overvoltage, because the residual voltage of arrester that adopts is higher at present, various substation equipments need higher insulation margin to guarantee the safe operation of system.
The applicant once proposed to utilize many group lightning arrester restriction ultra high voltage system operation overvoltage along the line, but the lightning arrester that wherein adopts is common lightning arrester, and the effect of over-voltage is desirable not enough.Simultaneously in the circuit breaker of transformer station, used switching-on resistance, the reliability of whole system is reduced.
Summary of the invention
The objective of the invention is to propose superpotential system in a kind of restriction ultra-high voltage AC transmission system, adopt better low residual voltage lightning arrester restriction switching overvoltage of performance and lightning overvoltage, cancel switching-on resistance simultaneously, to satisfy the requirement of ultra high voltage system overvoltage protection.
Superpotential system in the restriction ultra-high voltage AC transmission system that the present invention proposes comprises:
First transformer station and second transformer station, being used for voltage to the ultra-high voltage AC transmission system raises or reduces, and the power transfer in the ultra-high voltage AC transmission system controlled, first transformer station and second transformer station comprise a plurality of transformers respectively, organize lightning arrester and a plurality of circuit breaker more, a plurality of transformers link to each other with the high-voltage AC transmission system by a plurality of circuit breakers, organize on the bus that lightning arrester is connected in parallel on a plurality of corresponding transformers and transformer station respectively more;
Transmission line is used for the long-distance transmissions electric energy, and transmission line is connected between first transformer station and second transformer station, and transmission line is provided with many group lightning arresters.Be under 80% the situation in the high anti-compensativity of circuit, when the length of transmission line during less than 200 kilometers, two groups of lightning arresters are set at the two ends of transmission line, when transmission line length is 200 kilometers～300 kilometers, two ends are provided with two groups of lightning arresters in transmission line, in the transmission line moderate distance 1～2 group of lightning arrester are set, when transmission line length during greater than 300 kilometers, two ends are provided with two groups of lightning arresters in transmission line, in the transmission line moderate distance 3～5 groups of lightning arresters are set.
In the said system, described lightning arrester is low residual voltage lightning arrester.
Superpotential system in the restriction ultra-high voltage AC transmission system that the present invention proposes, its advantage is as follows:
1, the overvoltage protection system of the present invention's proposition is compared with existing overvoltage protection system, and structure is simple relatively, has therefore reduced equipment cost, and reliable operation, effective.
2, over-voltage of the present invention system, utilize the good voltage-current characteristic of low residual voltage lightning arrester and certain arrangement, switching overvoltage and lightning overvoltage are carried out the restriction of the degree of depth, thereby reduced insulating requirements to equipment, reduce the manufacturing cost and the manufacture difficulty of extra-high voltage equipment, be applicable to the overvoltage protection of the 1000kV AC extra high voltage system of present China.
3, over-voltage of the present invention system has cancelled the use of the switching-on resistance of transformer station's inner breaker, thereby has prolonged the useful life of circuit breaker, has improved the functional reliability of system.
Description of drawings
Fig. 1 is the circuit diagram of existing switching overvoltage restriction system.
Fig. 2 is a superpotential system schematic in the restriction ultra-high voltage AC transmission system that proposes of the present invention.
Among Fig. 1 and Fig. 2,1 is first transformer station, the 2nd, and transmission line, 3 is second transformer stations.T
1～T
2And T
1'～T
2' be respectively the transformer in first transformer station and second transformer station, B
1～B
3And B
1'～B
3' be respectively the circuit breaker in first transformer station and second transformer station, A
1～A
3And A
1'～A
3' be respectively the lightning arrester in first transformer station and second transformer station, A
4And A
4' be the lightning arrester at transmission line two ends, a
1～a
nBe the traditional thread binding lightning arrester of establishing in transmission line upper edge.
Embodiment
Superpotential system in the restriction ultra-high voltage AC transmission system that the present invention proposes, its structure comprises as shown in Figure 2:
First transformer station 1 and second transformer station 3 are used for voltage to the high-voltage AC transmission system and raise or reduce, and the power transfer in the high-voltage AC transmission system is controlled, and first transformer station and second transformer station comprise a plurality of transformer T respectively
1～T
2And T
1'～T
2', organize lightning arrester A more
1～A
3And A
1'～A
3', and a plurality of circuit breaker B
1～B
3And B
1'～B
3', a plurality of transformers link to each other with the high-voltage AC transmission system by a plurality of circuit breakers, and a plurality of lightning arresters are connected in parallel on respectively on the bus of a plurality of corresponding transformers and transformer station;
In the said system, described lightning arrester is low residual voltage lightning arrester.Its parameter request is:
Lightning impulse (20kA) residual voltage 1.2-1.45; Representative value 1.39;
Switching impulse (2kA) residual voltage 1.0-1.3; Representative value 1.26;
Voltage gradient 200-240V/mm; Representative value: 230cm;
Energy absorption density: 200-300J/cm
3
The operation principle of the overvoltage Limiting method that the present invention proposes is: after power system operation or thunderbolt generation switching overvoltage, lightning arrester action on the circuit or in the transformer station, the consequent electric current of releasing, and whole system is remained on the lower residual voltage of arrester level.Because low residual voltage protection of arrester excellent performance, residual voltage is very low, and this method can further limit switching overvoltage and lightning overvoltage on the basis of existing overvoltage level.For switching overvoltage, utilize in the transformer station or the low residual voltage lightning arrester at circuit two ends is enough to reduce overvoltage in the transformer station.Utilize the low residual voltage lightning arrester of installing along the line, can also make overvoltage on the circuit drop to the level of residual voltage of arrester, reach the purpose of degree of depth restriction.And for lightning overvoltage, the low residual voltage lightning arrester in the transformer station can limit the intrusion wave amplitude, protects various substation equipments.
Below be the embodiment that system of the present invention is used to limit switching overvoltage.
If the transmission line total length is 20.4 kilometers, the circuit transmission capacity is 3184-j1430MVA, and high anti-compensativity is 82.9%, the first side bus voltage 1060.4kV of transformer station, and second transformer station's side bus voltage is 1055.4kV.
The switching overvoltage restricted version that adopts is at present: reach the circuit both sides in two transformer stations common lightning arrester is installed, circuit breaker is installed the switching-on resistance of 600 Ω simultaneously.The restricted version one of the present invention's configuration is: reach the circuit both sides in transformer station low residual voltage lightning arrester is installed, simultaneously at the even 3 groups low residual voltage lightning arresters of arranging along the line; Restricted version two is: reach the circuit both sides in transformer station low residual voltage lightning arrester is installed, the some place arranges one group low residual voltage lightning arrester in the line simultaneously.The low residual voltage lightning arrester parameter that adopts is top listed canonical parameter.
After using overvoltage Limiting of the present invention system, can make the switching overvoltage level reduce 10%-20%.This shows the validity of the present invention to the switching overvoltage restriction.The overvoltage that adopts different schemes to obtain is as shown in table 1.
The comparison of table 1 pair switching overvoltage restriction effect
| The present scheme that adopts | The present invention program one | The present invention program two | |
| Close the ceases to be busy overvoltage | 1.51p.u. | 1.21p.u. | 1.40p.u. |
| The single-pole reclosing overvoltage | 1.10p.u. | 1.22p.u. | 1.46p.u. |
| Fault excites overvoltage | 1.56p.u. | 1.22p.u. | 1.34p.u. |
| Remove fault overvoltage | 1.80p.u. | 1.21p.u. | 1.54p.u. |
Below be the embodiment that system of the present invention is used to limit lightning overvoltage.
Calculating maximum shielding electric current is 36kA, the overvoltage of diverse location in transformer station during shielding inlet wire section 1# shaft tower, and the overvoltage that adopts different schemes to obtain is as shown in table 2.
The comparison of table 2 pair lightning overvoltage restriction effect
| The present scheme (common lightning arrester) that adopts | The present invention program's (low residual voltage lightning arrester) | |
| Main transformer | 1903 | 1466 |
| Main transformer CVT | 1899 | 1423 |
| Inlet wire GIS | 1952 | 1352 |
| Main transformer GIS | 2271 | 1524 |
| Inlet wire CVT | 2733 | 1607 |
Claims (2)
1. one kind is limited superpotential system in the ultra-high voltage AC transmission system, it is characterized in that this system comprises:
First transformer station and second transformer station, being used for voltage to the high-voltage AC transmission system raises or reduces, and the power transfer in the high-voltage AC transmission system controlled, first transformer station and second transformer station comprise a plurality of transformers, a plurality of lightning arrester and a plurality of circuit breaker respectively, a plurality of transformers link to each other with the high-voltage AC transmission system by a plurality of circuit breakers, organize on the bus that lightning arrester is connected in parallel on a plurality of corresponding transformers and transformer station respectively more;
Transmission line, be used for the long-distance transmissions electric energy, transmission line is connected between first transformer station and second transformer station, transmission line is provided with many group lightning arresters, when the length of transmission line during less than 200 kilometers, two groups low residual voltage lightning arresters are set at the two ends of transmission line, when transmission line length is 200 kilometers～300 kilometers, two ends are provided with two groups of lightning arresters in transmission line, in the transmission line moderate distance 1～2 group of lightning arrester is set, when transmission line length during greater than 300 kilometers, two ends are provided with two groups of lightning arresters in transmission line, in the transmission line moderate distance 3～5 groups of lightning arresters are set.
2. the system as claimed in claim 1 is characterized in that wherein said lightning arrester is low residual voltage lightning arrester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100233737A CN102074948A (en) | 2011-01-20 | 2011-01-20 | System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system |
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|---|---|---|---|
| CN2011100233737A CN102074948A (en) | 2011-01-20 | 2011-01-20 | System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system |
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| CN102074948A true CN102074948A (en) | 2011-05-25 |
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| CN2011100233737A Pending CN102074948A (en) | 2011-01-20 | 2011-01-20 | System for limiting overvoltage in ultrahigh-voltage alternating current power transmission system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078318A (en) * | 2013-01-09 | 2013-05-01 | 西安交通大学 | Overvoltage improvement method on basis of historical data of overhead power transmission line |
| CN106570241A (en) * | 2016-10-25 | 2017-04-19 | 中国电力科学研究院 | Method and system for adjusting layout of lightning arrester of ultra high voltage direct current converter station |
| CN106887831A (en) * | 2015-12-15 | 2017-06-23 | 中国电力科学研究院 | Ultra-high voltage AC transmission system switching overvoltage flexibility method for limiting |
| CN107482566A (en) * | 2017-09-08 | 2017-12-15 | 中国电力科学研究院 | Method and system for suppressing operation overvoltage of UHV line |
| CN107611937A (en) * | 2017-09-21 | 2018-01-19 | 南京南瑞继保电气有限公司 | The excess voltage protection and method of a kind of dc circuit breaker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640424A (en) * | 2009-08-20 | 2010-02-03 | 中国电力科学研究院 | On-off system of 1000kV AC ultrahigh-voltage transmission line |
-
2011
- 2011-01-20 CN CN2011100233737A patent/CN102074948A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101640424A (en) * | 2009-08-20 | 2010-02-03 | 中国电力科学研究院 | On-off system of 1000kV AC ultrahigh-voltage transmission line |
Non-Patent Citations (1)
| Title |
|---|
| 何计谋 等: "特高压避雷器的探讨", 《电瓷避雷器》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103078318A (en) * | 2013-01-09 | 2013-05-01 | 西安交通大学 | Overvoltage improvement method on basis of historical data of overhead power transmission line |
| CN106887831A (en) * | 2015-12-15 | 2017-06-23 | 中国电力科学研究院 | Ultra-high voltage AC transmission system switching overvoltage flexibility method for limiting |
| CN106570241A (en) * | 2016-10-25 | 2017-04-19 | 中国电力科学研究院 | Method and system for adjusting layout of lightning arrester of ultra high voltage direct current converter station |
| CN107482566A (en) * | 2017-09-08 | 2017-12-15 | 中国电力科学研究院 | Method and system for suppressing operation overvoltage of UHV line |
| CN107611937A (en) * | 2017-09-21 | 2018-01-19 | 南京南瑞继保电气有限公司 | The excess voltage protection and method of a kind of dc circuit breaker |
| CN107611937B (en) * | 2017-09-21 | 2020-03-20 | 南京南瑞继保电气有限公司 | Overvoltage protection circuit and method of direct current breaker |
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Application publication date: 20110525 |