CN102403672A - Super/ultrahigh voltage alternating and direct-current mixed compression line live-line work equipotential transfer safety method - Google Patents

Super/ultrahigh voltage alternating and direct-current mixed compression line live-line work equipotential transfer safety method Download PDF

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Publication number
CN102403672A
CN102403672A CN2011102520685A CN201110252068A CN102403672A CN 102403672 A CN102403672 A CN 102403672A CN 2011102520685 A CN2011102520685 A CN 2011102520685A CN 201110252068 A CN201110252068 A CN 201110252068A CN 102403672 A CN102403672 A CN 102403672A
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line
direct current
equipotential
operating personnel
circuit
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CN2011102520685A
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CN102403672B (en
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刘凯
彭勇
刘庭
肖宾
刘艳
苏梓铭
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State Grid Electric Power Research Institute
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State Grid Electric Power Research Institute
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Abstract

The invention provides a super/ultrahigh voltage alternating and direct-current mixed compression line live-line work equipotential transfer safety method, which comprises the following steps that the distance between an operator and a lower layer of alternating-current 500kV line conductor is kept between 7.3-14.6m, when the operator is at an upper layer of direct-current plus or minus 800kV line which is equipotential; the operator utilizes an insulating carrier tool to transfer from the upper layer of direct-current plus or minus 800kV line to a lower layer of alternating-current 500kV line, and in the transfer process, the sum of the distance between the upper layer of direct current plus or minus 800kV line conducting wire and the operator and the distance between the operator and the lower layer of alternating current 500kV line conducting wire is kept between 8.1-14.6m; and when the lower layer of alternating current 500kV line is equipotential, the distance between the operator and the upper layer direct current plus or minus 800kV line conducting wire is kept between 7.3-14.6m, when the operator is at the lower layer of alternating current 500kV line which is equipotential. According to the method, the operator can safely enter the lower layer of alternating current 500kV line from the upper layer of direct current plus or minus 800kV line.

Description

Ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential shifts safety method
Technical field
The present invention relates to ultra-high-tension power transmission line, particularly a kind of ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential shifts safety method.
Background technology
The mixed pressure of ultra-high/extra-high voltage alternating current-direct current belongs to a kind of novel transmission line with many loop lines of tower road transmission line in China; As shown in Figure 1; Transmission line is divided into upper strata extra-high voltage direct-current ± 800kV circuit and exchanges 500kV circuit two parts with lower floor superhigh pressure; It has transmission capacity big, reduce electric power corridor, characteristics that fed distance is far away, will and come into operation in China's East China construction.
When transmission line breaks down, need to detect, to overhaul or to transform to transmission line, in order not influence power supply, the transmission line uninterrupted power supply, the staff carries out live line working.
Take delivery vehicles such as hanging basket or chair lift near lead after many employing operating personnels wear a complete set of shielding clothing (comprising conductive glove) in 500kV and the following electric pressure hot line maintenance; Apart from the electrified body certain distance (for the transmission line of 110kV, 220kV, this distance be 0.3m; For the 500kV circuit, this distance is for 0.4m) thus the time directly catch and touch electrified body and realize that potential transfer gets into equipotential.For example relevant method introduced in " the high height above sea level 500kV hot line maintenance technical Analysis " literary composition on " Sichuan power technology " the 1st phase in 2004.
When the operating personnel gets into the potential transfer in the equipotential process, have a capacitor discharge pulse current, and be attended by electric arc.This pulse current increases along with the raising of electric pressure, and electric arc then strengthens along with the increase of pulse current.For 750 ~ 1000kV ultra-high/extra-high voltage alternating current circuit; Employed method gets into equipotential in 500kV and the following electric pressure live line working if still adopt; Pulse current and electric arc will produce harm to operating personnel's safety in the potential transfer process, and will damage screening clothing.
The patent No. is 200710169042.8 interchange ultra-high/extra-high voltage line live-line work equipotential access method and electric potential transferring stick thereof; The method that safety gets in the live line working of ultra-high/extra-high voltage alternating current circuit is provided: the operating personnel dresses ultra-high/extra-high voltage and exchanges a complete set of shielding clothing of live line working; Take the insulation delivery vehicle near electrified body after being connected electric potential transferring stick well with screening clothing; Apart from electrified body 0.4 ~ 0.6m the time; Use special-purpose electric potential transferring stick contact electrification body to carry out potential transfer, get into equipotential.Pulse current when significantly reducing potential transfer, obviously weaken electric arc; Avoid harm that the safety to the operating personnel causes and to the ablation of screening clothing; Improve greatly and get into equipotential fail safe, the useful life of prolongation screening clothing, raising live line working operating efficiency.
But the patent No. is that the just ultra-high/extra-high voltage alternating current circuit operating personnel that provided of 200710169042.8 interchange ultra-high/extra-high voltage line live-line work equipotential access method and electric potential transferring stick thereof is from access method and special envoy's instrument of earth potential to high potential.And for the mixed pressure of ultra-high/extra-high voltage alternating current-direct current with many times these novel transmission lines of tower; The operating personnel with the equipotential prerequisite of upper strata extra-high voltage direct-current lead under; When directly being transferred to lower floor's superhigh pressure interchange lead; People expect a kind ofly can instruct the mixed pressure of ultra-high/extra-high voltage alternating current-direct current with in the transmission line of many loop lines of tower road, and the live line working personnel directly carry out the appearance that equipotential shifts safety method.
Summary of the invention
The purpose of this invention is to provide a kind of ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential and shift safety method,, can make upper strata direct current ± 800kV circuit homework personal security get into lower floor and exchange the 500kV circuit according to the method.
In order to achieve the above object; Ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential of the present invention shifts safety method; It is characterized in that: the operating personnel dresses a complete set of shielding clothing equipotential and gets into position in upper strata direct current ± 800kV circuit shelves, and the operating personnel exchanges the 500kV line conductor during direct current ± 800kV circuit equipotential with lower floor on the upper strata distance remains between 7.3 ~ 14.6m; Direct current ± 800kV circuit utilization insulation delivery vehicle is transferred to lower floor and exchanges the 500kV circuit operating personnel from the upper strata; In transfer process, upper strata direct current ± 800kV line conductor to operating personnel's distance and operating personnel exchange remaining between 8.1 ~ 14.6m apart from sum of 500kV line conductor to lower floor; When the operation personnel arrived the interchange 500kV of lower floor circuit equipotential, the distance of operating personnel and upper strata direct current ± 800kV line conductor remained between 7.3 ~ 14.6m.
Can know with many loop lines of tower road live line working analog reslt according to the mixed pressure of a large amount of ultra-high/extra-high voltage alternating current-direct current; In height above sea level 1000m and following area; Upper strata direct current ± 800kV circuit maximum working voltage amplitude is 816kV; It is 550kV that lower floor exchanges 500kV circuit maximum working voltage amplitude, and issuable maximum switching overvoltage amplitude is 1684kV between the levels circuit.In operating personnel's live line working; When the distance that exchanges the 500kV line conductor with lower floor as upper strata direct current ± 800kV circuit shelves medium potential operating personnel is 7.3 ~ 14.6m; Its insulation withstand voltage is greater than alternate maximum switching overvoltage (1684kV); The discharge probability in alternate gap is controlled within the live line working level of significance, meets the live line working safety requirements; When being in upper strata direct current ± 800kV, the operation personnel exchange 500kV circuit centre position with lower floor; Upper strata direct current ± 800kV line conductor to operating personnel's distance and operating personnel to lower floor exchange the 500kV line conductor be 8.1 ~ 14.6m apart from sum the time; Its insulation withstand voltage is greater than alternate maximum switching overvoltage (1684kV), and the discharge probability in alternate gap is controlled within the live line working level of significance; When the operation personnel are in the interchange 500kV of lower floor equipotential; When the distance of operating personnel and upper strata direct current ± 800kV line conductor is 7.3 ~ 14.6m; Its insulation withstand voltage is greater than alternate maximum switching overvoltage (1684kV); The discharge probability in alternate gap is controlled within the live line working level of significance, meets the live line working safety requirements.
Ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential provided by the invention shifts safety method, according to the method, can make upper strata direct current ± 800kV circuit homework personal security get into lower floor and exchange the 500kV circuit.
Description of drawings
Fig. 1 is the structural representation of ultra-high/extra-high voltage alternating current-direct current mixed pressure with many loop lines of tower road transmission line.
Fig. 2 is the sketch map of operating personnel in upper strata direct current ± 800kV circuit shelves.
Fig. 3 is that direct current ± 800kV circuit utilization insulation delivery vehicle is transferred to the sketch map that lower floor exchanges the 500kV circuit to the operating personnel from the upper strata.
Fig. 4 is that the operating personnel exchanges the sketch map in the 500kV circuit shelves in lower floor.
Embodiment
The explanation of Fig. 1 mark: iron tower 1, insulator 2, grading ring 3, upper strata direct current ± 800kV line conductor 4, lower floor exchanges 500kV line conductor 5.
The explanation of Fig. 2 mark: D1-operating personnel exchanges the distance of 500kV line conductor during direct current ± 800kV circuit equipotential with lower floor on the upper strata.
The explanation of Fig. 3 mark: insulation delivery vehicle 6, the distance of operating personnel and upper strata direct current ± 800kV line conductor in S1-transfer process, operating personnel and the distance that exchanges the 500kV line conductor with lower floor in S2-transfer process.
When the explanation of Fig. 4 mark: D2-be operating personnel exchanges 500kV circuit equipotential in lower floor and the distance of upper strata direct current ± 800kV line conductor.
Referring to Fig. 1; Ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential of the present invention shifts safety method and is applicable to that upper strata as shown in Figure 1 is that extra-high voltage direct-current ± 800kV circuit, lower floor are the transmission line that superhigh pressure exchanges the 500kV circuit, and upper strata direct current ± 800kV line conductor 4 exchanges 500kV line conductor 5 and is suspended on the iron tower 1 through insulator 2 and grading ring 3 with lower floor.
Ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential of the present invention shifts safety method: the operating personnel dresses a complete set of shielding clothing equipotential and gets into position in upper strata direct current ± 800kV circuit shelves, and the operating personnel exchanges 500kV line conductor 5 during direct current ± 800kV circuit equipotential with lower floor on the upper strata distance remains between 7.3 ~ 14.6m; Direct current ± 800kV circuit utilization insulation delivery vehicle 6 is transferred to lower floor and exchanges the 500kV circuit operating personnel from the upper strata; In transfer process, upper strata direct current ± 800kV line conductor 4 to operating personnel's distance and operating personnel exchange remaining between 8.1 ~ 14.6m apart from sum of 500kV line conductor 5 to lower floor; When the operation personnel arrived the interchange 500kV of lower floor circuit equipotential, the distance of operating personnel and upper strata direct current ± 800kV line conductor 4 remained between 7.3 ~ 14.6m.
Can know with many loop lines of tower road live line working analog reslt according to the mixed pressure of a large amount of ultra-high/extra-high voltage alternating current-direct current; In height above sea level 1000m and following area; Upper strata direct current ± 800kV circuit maximum working voltage amplitude is 816kV; It is 550kV that lower floor exchanges 500kV circuit maximum working voltage amplitude, and issuable maximum switching overvoltage amplitude is 1684kV between the levels circuit.In operating personnel's live line working; When the distance that exchanges 500kV line conductor 5 with lower floor as upper strata direct current ± 800kV circuit shelves medium potential operating personnel is 7.3 ~ 14.6m; Its insulation withstand voltage is greater than alternate maximum switching overvoltage (1684kV); The discharge probability in alternate gap is controlled within the live line working level of significance, meets the live line working safety requirements; When being in upper strata direct current ± 800kV, the operation personnel exchange 500kV circuit centre position with lower floor; Upper strata direct current ± 800kV line conductor 4 to operating personnel's distance and operating personnel to lower floor exchange 500kV line conductor 5 be 8.1 ~ 14.6m apart from sum the time; Its insulation withstand voltage is greater than alternate maximum switching overvoltage (1684kV), and the discharge probability in alternate gap is controlled within the live line working level of significance; When the operation personnel are in the interchange 500kV of lower floor equipotential; When the distance of operating personnel and upper strata direct current ± 800kV line conductor 4 is 7.3 ~ 14.6m; Its insulation withstand voltage is greater than alternate maximum switching overvoltage (1684kV); The discharge probability in alternate gap is controlled within the live line working level of significance, meets the live line working safety requirements.
Ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential provided by the invention shifts safety method; According to the method; Can make upper strata direct current ± 800kV circuit homework personal security get into lower floor and exchange the 500kV circuit; Popularization of the method and application have positive meaning to the safe live line working of instructing ultra-high/extra-high voltage alternating current-direct current mixed pressure circuit.

Claims (1)

1. ultra-high/extra-high voltage alternating current-direct current mixed pressure line live-line work equipotential shifts safety method; It is characterized in that: the operating personnel dresses a complete set of shielding clothing equipotential and gets into position in upper strata direct current ± 800kV circuit shelves, and the operating personnel exchanges the 500kV line conductor during direct current ± 800kV circuit equipotential with lower floor on the upper strata distance remains between 7.3 ~ 14.6m; Direct current ± 800kV circuit utilization insulation delivery vehicle is transferred to lower floor and exchanges the 500kV circuit operating personnel from the upper strata; In transfer process, upper strata direct current ± 800kV line conductor to operating personnel's distance and operating personnel exchange remaining between 8.1 ~ 14.6m apart from sum of 500kV line conductor to lower floor; When the operation personnel arrived the interchange 500kV of lower floor circuit equipotential, the distance of operating personnel and upper strata direct current ± 800kV line conductor remained between 7.3 ~ 14.6m.
CN2011102520685A 2011-08-30 2011-08-30 Super/ultrahigh voltage alternating and direct-current mixed compression line live-line work equipotential transfer safety method Active CN102403672B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103515858A (en) * 2013-09-09 2014-01-15 国家电网公司 Method for entering 400kV direct-current electric transmission line tangent tower equipotential
CN103618251A (en) * 2013-11-27 2014-03-05 国家电网公司 Technology for electrified overhaul of +-800kV ultrahigh voltage direct-current transmission line
CN105162006A (en) * 2015-06-30 2015-12-16 国网浙江省电力公司金华供电公司 Safety method for reaching equipotential of 1000 kilovolt transformer substation in live-line manner
CN108649481A (en) * 2018-04-25 2018-10-12 中国电力科学研究院有限公司 Transmission line of alternation current livewire work personnel's equipotential safe transfer method

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CN101567530A (en) * 2009-06-03 2009-10-28 国网电力科学研究院 Safe method for entering tangent tower equal potentials for live-wire operation in 660kV direct current lines
CN101728787A (en) * 2008-10-29 2010-06-09 国网电力科学研究院 Equipotential access method of 500kV same-tower four-circuit transmission line tangent tower live-wire work
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103515858A (en) * 2013-09-09 2014-01-15 国家电网公司 Method for entering 400kV direct-current electric transmission line tangent tower equipotential
CN103618251A (en) * 2013-11-27 2014-03-05 国家电网公司 Technology for electrified overhaul of +-800kV ultrahigh voltage direct-current transmission line
CN105162006A (en) * 2015-06-30 2015-12-16 国网浙江省电力公司金华供电公司 Safety method for reaching equipotential of 1000 kilovolt transformer substation in live-line manner
CN108649481A (en) * 2018-04-25 2018-10-12 中国电力科学研究院有限公司 Transmission line of alternation current livewire work personnel's equipotential safe transfer method

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