CN105186372B - A kind of test method for being applied to research 10kV leakage conductor Contact patch - Google Patents

A kind of test method for being applied to research 10kV leakage conductor Contact patch Download PDF

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Publication number
CN105186372B
CN105186372B CN201510624042.7A CN201510624042A CN105186372B CN 105186372 B CN105186372 B CN 105186372B CN 201510624042 A CN201510624042 A CN 201510624042A CN 105186372 B CN105186372 B CN 105186372B
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China
Prior art keywords
anchor ear
shaft tower
grounding
cement shaft
down conductor
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CN201510624042.7A
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CN105186372A (en
Inventor
王华云
郑蜀江
陈子涵
安义
蔡木良
王羽
李博江
刘蓓
潘建兵
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State Grid Corp of China SGCC
Wuhan University WHU
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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State Grid Corp of China SGCC
Wuhan University WHU
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Abstract

A kind of test method for being applied to research 10kV leakage conductor Contact patch, methods described includes:10kV distribution line test models are built, selected device model should be consistent with actual track, model arrangement includes 10kV cement shaft towers(1), iron cross arm and anchor ear(2), 10kV line insulators(3), 10kV circuit surge arrester with external series gaps(4), analog conducting wire(5), down conductor(6), impulse voltage generator(7), pole tower ground resistance(8);Reinforcing bar effective grounding all the time inside cement shaft tower;Individually laying down conductor respectively and carrying out lightning impulse contrast test by earthing or grounding means ground connection and in the case of not laying down conductor individually by shaft tower natural grounding.How present invention research leakage conductor uses rational Contact patch, and to have positive role to distribution line lightning protection, guidance is provided for actual engineering design.

Description

A kind of test method for being applied to research 10kV leakage conductor Contact patch
Technical field
The present invention relates to a kind of test method for being applied to research 10kV leakage conductor Contact patch, category distribution line is prevented Thunder field.
Background technology
Distribution line is the one-level of closer user in power system, is responsible for industrial and agricultural production, resident's daily life The important duty of power supply, with the characteristics of line construction is complicated, circuit total amount is more, area coverage is wide.Exist over a long period of time The thought of weight major network light distribution, cause to exist compared with major network in terms of the status of equipment of current distribution, technical merit compared with Big gap.Distribution line dielectric level is relatively low, and general without special lightning protection measures, is not only influenceed by direct lightning strike, simultaneously Also can occur insulator arc-over because of the influence for the induced overvoltage that thunderbolt ground is produced.Compared to ultra-high-tension power transmission line, distribution wire Road is easier occur lightning stroke flashover tripping operation, has a strong impact on power supply reliability.
For distribution line frequently Lightning Disaster, a variety of Lighting Protection Measures are employed in succession both at home and abroad, wherein installing Leakage conductor is more effective manner.Leakage conductor is installed no matter in terms of preventing from attacking lightning overvoltage directly, or anti- Only play the role of in terms of induction lightening overvoltage positive.
In 10kV distribution line Practical Projects, due to the consideration for economy and operability, leakage conductor may Do not lay down conductor individually, but by the use of reinforcing bar in shaft tower as the passage of aerial drainage, the cement pole in actual track Tower circuit can puncture cement insulation weakness when occurring lightning stroke flashover, to line lightning resisting level, protection of arrester effect and people The influence of body safety is analyzed currently without systematic research, lacks the checking of experiment.
Notification number CN203278165U discloses a kind of 10kV distribution overhead lines arrester arrangement, including cement pole Tower, leakage conductor, line insulator, transmission pressure, down conductor and pole tower ground resistance, leakage conductor and circuit are exhausted Edge is connected and on cement shaft tower, the high-pressure side of leakage conductor is connected with transmission pressure, the ground connection of leakage conductor End is connected with down conductor, and down conductor is grounded after being connected by galvanized steel bar or band steel with pole tower ground resistance.But should There are the following problems for utility model:When amplitude of lightning current is larger, very big voltage can be produced when entering ground by grounding resistance, is caused Arrester ground end above earth potential rise, this potential difference is added in reinforcing bar and cross-arm insulation two ends inside shaft tower, and cement shaft tower is exhausted Edge weakness will be damaged, and individually lay down conductor and can also increase line thunder protection cost.
Notification number CN203160802U discloses a kind of integrated concrete electric of the ground connection using complete built-in grounding electrode Bar, it sets a non-prestressed ground rebar as built-in down conductor in concrete electric club shaft, in concrete electric The top of bar and middle and lower part at least respectively set a built-in grounding nut, one end of built-in grounding nut and concurrent respectively Side surface it is concordant, or expose the side surface of concurrent, the other end fixes as one with non-prestressed ground rebar;Mixed The bottom of solidifying soil electric pole sets a ground connection pipe holder, and non-prestressed ground rebar fixes as one with ground connection pipe holder;Connecing One earthing pole is set below ground pipe holder, and earthing pole fixes as one with ground connection pipe holder;Non-prestressed ground rebar, ground connection Pipe holder and earthing pole constitute the ground electrode system of concurrent.The utility model has saved cost, and due to built-in ground connection The presence of nut, will not puncture cement shaft tower insulation weakness, but not over system test comparative study leakage conductor Whether there is influence of the independent grounding downlead to general cement pole structure, protection of arrester effect.
Notification number CN103015786 discloses a kind of concurrent for having and being grounded integrated function, the utility model Non-prestressed ground rebar and grounding nut similar with CN203160802U features, special by setting so that concrete electric Three are combined into one and are connected to become an entirety between bar, down conductor and earthing pole, and avoid ground rebar and expose concrete Electric pole surface.
In addition, most of patent on 10kV distribution overhead line lightning protections, do not refer to how system research 10kV leakage conductors are arranged on the test method of form under grounding lead when on cement shaft tower.
The content of the invention
The purpose of the present invention is to be grounded shape when how to arrange that distribution line arrester is arranged on cement shaft tower to study Formula, so as to have positive role to distribution line lightning protection, is devised a kind of suitable for studying 10kV leakage conductor Contact patch Test method.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that:
A kind of test method for being applied to research 10kV leakage conductor Contact patch of the present invention comprises the following steps:
(1)10kV distribution line test models are built, selected device model should be consistent with actual track, model arrangement includes 10kV cement shaft tower, iron cross arm and anchor ear, 10kV line insulators, 10kV circuits surge arrester with external series gaps, analog conducting wire, Down conductor, impulse voltage generator, pole tower ground resistance;Reinforcing bar effective grounding all the time inside cement shaft tower;
Hanging holds up cement shaft tower, and iron cross arm is fixed on 10kV cement shaft towers by anchor ear;
The 10kV line insulators base is fixed on iron cross arm, and analog conducting wire is bundled on 10kV line insulators End, 10kV circuits are installed in parallel in 10kV line insulators both sides with surge arrester with external series gaps according to corresponding requirements;
The impulse voltage generator high-voltage connection is electrically connected with analog conducting wire one end, and reinforcing bar passes through inside cement shaft tower Pole tower ground resistance effective grounding;
Down conductor one terminates iron cross arm, one end effective grounding;One is set to switch on down conductor;
(2)Individually lay a copper cash to be grounded iron cross arm and anchor ear, impulse voltage generator high-voltage connection is led with simulation Line one end is electrically connected, and uses waveform parameter to carry out 30 lightning impulses by lifting and lowering method for 1.2/50 μ s negative polarity lightning wave and puts Electric test, record test data and photo, should try one's best and reduce the interference of external factor;Then anchor ear is removed, observation anchor ear bundle The place's of tying up cement shaft tower whether there is damage vestige, if vestige is not obvious, and one layer of blank sheet of paper auxiliary observation experiment can be wrapped up at anchor ear Phenomenon;
(3)Then anchor ear is reduced, and removes step(2)In the down conductor that individually lays, equally using waveform parameter For 1.2/50 μ s negative polarity lightning wave, voltage is gradually risen, until 10kV circuits occur to discharge now with surge arrester with external series gaps As record test data and photo;Keep voltage constant, carry out after 30 lightning impulse tests, at observation anchor ear binding 10kV cement shaft towers whether there is damage vestige;
(4)Repairing experiment data, to 10kV cement when comparative analysis 10kV leakage conductors whether there is independent grounding downlead The influence of shaft tower dielectric strength and 10kV circuits surge arrester with external series gaps protecting effect, and draw rational conclusion.
The present invention technical principle be:In existing Practical Project, because arrester ground form is unreasonable, thunder is occurred in that Cement is insulated weakness punch-through sometimes when hitting flashover.The invention aims to study how to arrange distribution line Arrester is arranged on Contact patch when on cement shaft tower, so as to have positive role to distribution line lightning protection.It is lightning-arrest in circuit respectively Device individually lay down conductor and through shaft tower natural grounding in the case of carry out lightning impulse test, cement can be obtained The breakdown voltage of shaft tower insulation weakness and puncture vestige, and the protecting effect of arrester can be observed, be that research conclusion is carried For test data and checking.
The beneficial effects of the invention are as follows the present invention is individually being laid respectively by building 10kV distribution line test models Down conductor is simultaneously grounded by earthing or grounding means and does not lay down conductor individually by being carried out in the case of shaft tower natural grounding Lightning impulse contrast test, can study how leakage conductor uses rational Contact patch, to have to distribution line lightning protection Positive role, guidance is provided for actual engineering design.
The present invention can provide technological guidance and reference for Thunder Protection person when studying 10kV distribution line lightning Protection Designs.
Brief description of the drawings
Fig. 1 is the structural representation of 10kV distribution lines test model of the present invention;
In figure, 1 is 10kV cement shaft towers;2 be iron cross arm and anchor ear;3 be 10kV line insulators;4 be 10kV circuits Use surge arrester with external series gaps;5 be analog conducting wire;6 be down conductor;7 be impulse voltage generator;8 be pole tower ground resistance.
Embodiment
The embodiment of the present invention is as shown in Figure 1.
Specific implementation step is summarized as follows:
(1)10kV distribution line test models are built, selected device model should be consistent with actual track, cloth as shown in Figure 1 Put, including 10kV cement shaft tower 1, iron cross arm and anchor ear 2,10kV line insulators 3,10kV circuit surge arrester with external series gaps 4th, analog conducting wire 5, down conductor 6, impulse voltage generator 7, pole tower ground resistance 8.
10kV cement shaft tower 1 is holded up using hanging, iron cross arm 2 is fixed on 10kV cement shaft tower 1 by anchor ear;
The base of 10kV line insulators 3 is fixed on iron cross arm 2, analog conducting wire 5 is bundled on 10kV line insulators 3 End, 10kV circuits are installed in parallel in the both sides of 10kV line insulators 3 with surge arrester with external series gaps 4 according to corresponding requirements;
The high-voltage connection of impulse voltage generator 7 is electrically connected with the one end of analog conducting wire 5, and reinforcing bar leads to inside 10kV cement shaft tower Cross the effective grounding of pole tower ground resistance 8;
Down conductor 6 one terminates iron cross arm 2, one end effective grounding;One is set to switch on down conductor.
(2)Individually lay a copper cash first to be grounded iron cross arm and anchor ear, impulse voltage generator high-voltage connection and mould Intend wire one end to be electrically connected, use waveform parameter to carry out 30 thunders and lightnings by lifting and lowering method for 1.2/50 μ s negative polarity lightning wave and rush Discharge test, record test data and photo are hit, should try one's best and reduce the interference of external factor;Then anchor ear is removed, observation is embraced 10kV cement shaft towers whether there is damage vestige at hoop binding, if vestige is not obvious, and one layer of blank sheet of paper auxiliary can be wrapped up at anchor ear Viewing test phenomenon.
(3)Then anchor ear is reduced, passes through switch cutoff step(2)In the down conductor that individually lays, equally using ripple Shape parameter is 1.2/50 μ s negative polarity lightning wave, voltage is gradually risen, until 10kV circuits occur with surge arrester with external series gaps Electric discharge phenomena, record test data and photo;Keep voltage constant, carry out after 30 lightning impulse tests, observe anchor ear 10kV cement shaft tower whether there is damage vestige at binding.
(4)Repairing experiment data, to 10kV cement when comparative analysis 10kV leakage conductors whether there is independent grounding downlead The influence of shaft tower dielectric strength and protection of arrester effect, and draw rational conclusion.

Claims (1)

1. a kind of test method for being applied to research 10kV leakage conductor Contact patch, it is characterised in that the step of methods described It is rapid as follows:
(1) 10kV distribution line test models are built, selected device model should be consistent with actual track, model arrangement includes 10kV Cement shaft tower, iron cross arm and anchor ear, 10kV line insulators, 10kV circuits surge arrester with external series gaps, analog conducting wire, ground connection Downlead, impulse voltage generator, pole tower ground resistance;Reinforcing bar effective grounding all the time inside cement shaft tower;
Hanging holds up cement shaft tower, and iron cross arm is fixed on 10kV cement shaft towers by anchor ear;
The 10kV line insulators base is fixed on iron cross arm, and analog conducting wire is bundled in 10kV line insulators upper end, 10kV circuits are installed in parallel in 10kV line insulators both sides with surge arrester with external series gaps according to corresponding requirements;
The impulse voltage generator high-voltage connection is electrically connected with analog conducting wire one end, and reinforcing bar passes through shaft tower inside cement shaft tower Grounding resistance effective grounding;
The down conductor one terminates iron cross arm, one end effective grounding;One is set to switch on down conductor;
(2) individually lay a copper cash to be grounded iron cross arm and anchor ear for down conductor, impulse voltage generator high-voltage connection It is electrically connected with analog conducting wire one end, uses waveform parameter to carry out 30 thunders by lifting and lowering method for 1.2/50 μ s negative polarity lightning wave Surge discharge test, record test data and photo, should try one's best and reduce the interference of external factor;Then anchor ear is removed, seen Examine cement shaft tower at anchor ear binding whether there is damage vestige, if vestige is not obvious, one layer of blank sheet of paper auxiliary can be wrapped up at anchor ear Viewing test phenomenon;
(3) anchor ear is reduced, the down conductor individually laid by switch cutoff equally uses waveform parameter for 1.2/50 μ s' Negative polarity lightning wave, gradually rises voltage, until 10kV circuits surge arrester with external series gaps generation electric discharge phenomena, record experiment number According to and photo;Keep voltage constant, carry out after 30 lightning impulse tests, there there are 10kV cement shaft towers at observation anchor ear binding Without damage vestige;
(4) repairing experiment data, to 10kV cement shaft towers when comparative analysis 10kV leakage conductors whether there is independent grounding downlead The influence of dielectric strength and 10kV circuits surge arrester with external series gaps protecting effect, and draw rational conclusion.
CN201510624042.7A 2015-09-28 2015-09-28 A kind of test method for being applied to research 10kV leakage conductor Contact patch Active CN105186372B (en)

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CN106207510A (en) * 2016-08-26 2016-12-07 张振堂 A kind of high voltage transmission line grounding-for-lightning device

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN203278165U (en) * 2013-06-25 2013-11-06 广西电网公司电力科学研究院 10kV overhead distribution line arrester arrangement structure
CN103913651A (en) * 2014-03-10 2014-07-09 国家电网公司 Lightning protection test method for inner-side grounded down-leading composite material tower

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JPH0826161A (en) * 1994-07-15 1996-01-30 Honda Motor Co Ltd Front body structure of scooter type vehicle
ES2418204B2 (en) * 2013-05-30 2014-04-25 Aplicaciones Tecnologicas, S.A. TESTING EQUIPMENT FOR PARARRAYOS WITH PRIMING DEVICE, INSTALLATION OF PARARRAYOS WITH SUCH APPARATUS AND TESTING PROCEDURE

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203278165U (en) * 2013-06-25 2013-11-06 广西电网公司电力科学研究院 10kV overhead distribution line arrester arrangement structure
CN103913651A (en) * 2014-03-10 2014-07-09 国家电网公司 Lightning protection test method for inner-side grounded down-leading composite material tower

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