CN105186372A - Test method applicable for studying grounding mode of 10kV circuit arrester - Google Patents

Test method applicable for studying grounding mode of 10kV circuit arrester Download PDF

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Publication number
CN105186372A
CN105186372A CN201510624042.7A CN201510624042A CN105186372A CN 105186372 A CN105186372 A CN 105186372A CN 201510624042 A CN201510624042 A CN 201510624042A CN 105186372 A CN105186372 A CN 105186372A
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China
Prior art keywords
grounding
circuit
shaft tower
anchor ear
arrester
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Granted
Application number
CN201510624042.7A
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Chinese (zh)
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CN105186372B (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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Priority to CN201510624042.7A priority Critical patent/CN105186372B/en
Publication of CN105186372A publication Critical patent/CN105186372A/en
Application granted granted Critical
Publication of CN105186372B publication Critical patent/CN105186372B/en
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Abstract

The invention relates to a test method applicable for studying a grounding mode of a 10kV circuit arrester. The method comprises the following steps of: building a 10kV power distribution circuit test model, wherein a selected device type is in conformity to an actual circuit, and model arrangement comprises a 10kV cement pole tower (1), an iron cross beam and hoop (2), 10kV circuit insulators (3), surge arresters with external series gaps (4) for a 10kV circuit, simulation wires (5), a grounding down lead (6), an impulse voltage generator (7) and a pole tower grounding resistor (8); leading steel bars in the cement pole tower to be effectively grounded all the time; and carrying out lightning impulse contrast tests on a condition that the grounding down lead is independently laid and the arrester is grounded through a grounding device and a condition that the grounding down lead is not independently laid and the arrester is naturally grounded through the pole tower. According to the test method, how to adopt a reasonable grounding mode by the circuit arrester is studied, a positive effect is played in lightning prevention of the power distribution circuit, and guidance is provided for the design of actual engineering.

Description

A kind of test method being applicable to research 10kV leakage conductor Contact patch
Technical field
The present invention relates to a kind of test method being applicable to study 10kV leakage conductor Contact patch, belong to distribution line lightning protection field.
Background technology
Distribution line is the one-level of closer user in electric power system, is responsible for the important duty of powering to industrial and agricultural production, resident's daily life, has line construction complexity, circuit total amount is many, area coverage is wide feature.There is the thought of the light distribution of major network emphatically over a long period of time, cause the aspects such as the status of equipment of current distribution, technical merit all to there is larger gap compared with major network.Distribution line insulation level is lower, and generally without special lightning protection measures, is not only subject to the impact of direct lightning strike, also because of the impact of the induction overvoltage of thunderbolt ground generation, insulator arc-over can occur simultaneously.Compare ultra-high-tension power transmission line, more easily there is lightning stroke flashover tripping operation in distribution line, has a strong impact on power supply reliability.
For distribution line Lightning Disaster frequently, in succession have employed multiple Lighting Protection Measures both at home and abroad, wherein installing leakage conductor is comparatively effective mode.Leakage conductor is installed no matter preventing in direct lightning strike overvoltage, or is preventing there is positive effect in induction lightening overvoltage.
In 10kV distribution line Practical Project; due to the consideration for economy and operability; leakage conductor may not have and lays down conductor separately; but to utilize in shaft tower reinforcing bar as the passage of earial drainage; the weakness that cement can be insulated during cement shaft tower circuit generation lightning stroke flashover in actual track punctures; systematic research analysis is not had at present on the impact of line lightning resisting level, protection of arrester effect and personal safety, lacks the checking of test.
Notification number CN203278165U discloses a kind of 10kV distribution overhead line lightning arrester arrangement, comprise cement shaft tower, leakage conductor, line insulator, transmission pressure, down conductor and pole tower ground resistance, leakage conductor and line insulation sub-connection are also arranged on cement shaft tower, the high-pressure side of leakage conductor is connected with transmission pressure, the earth terminal of leakage conductor is connected with down conductor, ground connection after down conductor is connected with pole tower ground resistance by galvanized steel bar or band steel.But there are the following problems for this utility model: when amplitude of lightning current is larger, very large voltage can be produced when entering ground through earth resistance, arrester ground end above earth potential is caused to raise, this potential difference is added in the inner reinforcing bar of shaft tower and cross-arm insulation two ends, cement shaft tower insulation weakness will be damaged, and lays separately down conductor and also can increase line thunder protection cost.
Notification number CN203160802U discloses a kind of ground connection integration concurrent adopting complete built-in grounding electrode, it arranges a non-prestressed ground rebar as built-in down conductor in concrete electric club shaft, on the top of concurrent and middle and lower part, a built-in grounding nut is at least respectively set respectively, one end of built-in grounding nut is concordant with the side surface of concurrent, or exposing the side surface of concurrent, the other end and non-prestressed ground rebar fix as one; Arrange a ground pipe support in the bottom of concurrent, non-prestressed ground rebar and ground pipe support fix as one; Below ground pipe support, arrange an earth electrode, earth electrode and ground pipe support fix as one; Non-prestressed ground rebar, ground pipe support and earth electrode form the ground electrode system of concurrent.This utility model has saved cost; and due to the existence of built-in grounding nut; cement shaft tower insulation weakness can not be punctured, but not pass through system test comparative study leakage conductor with or without the impact of independent grounding downlead on general cement pole structure, protection of arrester effect.
Notification number CN103015786 discloses a kind of concurrent with ground connection integrated function, this utility model is similar with CN203160802U feature, by arranging special non-prestressed ground rebar and grounding nut, make concurrent, three be combined into one and connect into as a whole between down conductor and earth electrode, and avoid ground rebar and expose concurrent surface.
In addition, great majority are about the patent of 10kV distribution overhead line lightning protection, and the test method of form under grounding lead when not mentioned how system research 10kV leakage conductor is arranged on cement shaft tower.
Summary of the invention
The object of the invention is, Contact patch when how to arrange that distribution line lightning arrester is arranged on cement shaft tower to study, thus have positive role to distribution line lightning protection, devise a kind of test method being applicable to study 10kV leakage conductor Contact patch.
For achieving the above object, the present invention adopts following technical scheme:
A kind of test method being applicable to study 10kV leakage conductor Contact patch of the present invention comprises the following steps:
(1) 10kV distribution line test model is built, selected device model should conform to actual track, and model is arranged and comprised 10kV cement shaft tower, iron cross arm and anchor ear, 10kV line insulator, 10kV circuit surge arrester with external series gaps, analog conducting wire, down conductor, impulse voltage generator, pole tower ground resistance; The effective grounding all the time of cement shaft tower internal steel muscle;
Hanging holds up cement shaft tower, is fixed on 10kV cement shaft tower by iron cross arm by anchor ear;
Described 10kV line insulator base is fixed on iron cross arm, and analog conducting wire is bundled in 10kV line insulator upper end, and 10kV circuit surge arrester with external series gaps is installed in parallel in 10kV line insulator both sides according to corresponding requirements;
Described impulse voltage generator high-voltage connection and analog conducting wire one end are electrically connected, and cement shaft tower internal steel muscle is by pole tower ground resistance effective grounding;
Down conductor one termination iron cross arm, one end effective grounding; Down conductor is arranged a switch;
(2) copper cash is laid separately by iron cross arm and anchor ear ground connection, impulse voltage generator high-voltage connection and analog conducting wire one end are electrically connected, employing waveform parameter is that the negative polarity lightning wave of 1.2/50 μ s carries out 30 lightning impulse tests by lifting and lowering method, record test data and photo, should reduce the interference of external factor as far as possible; Then anchor ear is removed, observe anchor ear binding place cement shaft tower with or without damage vestige, if vestige is not obvious, one deck blank sheet of paper auxiliary observation experimental phenomena can be wrapped up at anchor ear place;
(3) anchor ear is then reduced, and removing the down conductor laid separately in step (2), same employing waveform parameter is the negative polarity lightning wave of 1.2/50 μ s, boosted voltage gradually, until 10kV circuit surge arrester with external series gaps generation electric discharge phenomena, record test data and photo; Keep voltage constant, after carrying out 30 lightning impulse tests, observe anchor ear binding place 10kV cement shaft tower with or without damage vestige;
(4) repairing experiment data, comparative analysis 10kV leakage conductor with or without during independent grounding downlead on the impact with surge arrester with external series gaps protected effect of 10kV cement shaft tower dielectric strength and 10kV circuit, and draw rational conclusion.
Know-why of the present invention is: in existing Practical Project, and because arrester ground form is unreasonable, insulate cement when there is lightning stroke flashover weakness punch-through sometimes.The object of the invention is in order to study how to arrange that distribution line lightning arrester is arranged on cement shaft tower time Contact patch, thus have positive role to distribution line lightning protection.Respectively when leakage conductor lay separately down conductor and through shaft tower natural grounding carry out lightning impulse test; the puncture voltage of cement shaft tower insulation weakness can be obtained and puncture vestige; and the protected effect of lightning arrester can be observed, for research conclusion provides test data and checking.
The invention has the beneficial effects as follows, the present invention is by building 10kV distribution line test model, respectively lay down conductor separately and by earthing device ground connection and do not lay separately down conductor by shaft tower natural grounding situation under carry out lightning impulse contrast test, leakage conductor can be studied and how to adopt rational Contact patch, to have positive role to distribution line lightning protection, for actual engineering design provides guidance.
The present invention can provide technological guidance and reference for Thunder Protection person when studying 10kV distribution line lightning Protection Design.
Accompanying drawing explanation
Fig. 1 is the structural representation of 10kV distribution line test model of the present invention;
In figure, 1 is 10kV cement shaft tower; 2 is iron cross arm and anchor ear; 3 is 10kV line insulators; 4 is 10kV circuit surge arrester with external series gaps; 5 is analog conducting wires; 6 is down conductors; 7 is impulse voltage generators; 8 is pole tower ground resistances.
Embodiment
The specific embodiment of the present invention as shown in Figure 1.
Concrete implementation step is summarized as follows:
(1) 10kV distribution line test model is built, selected device model should conform to actual track, arrange as shown in Figure 1, comprise 10kV cement shaft tower 1, iron cross arm and anchor ear 2,10kV line insulator 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.
Adopt hanging to hold up 10kV cement shaft tower 1, iron cross arm 2 is fixed on 10kV cement shaft tower 1 by anchor ear;
Be fixed on iron cross arm 2 by 10kV line insulator 3 base, analog conducting wire 5 is bundled in 10kV line insulator 3 upper end, and 10kV circuit surge arrester with external series gaps 4 is installed in parallel in 10kV line insulator 3 both sides according to corresponding requirements;
Impulse voltage generator 7 high-voltage connection and analog conducting wire 5 one end are electrically connected, and 10kV cement shaft tower internal steel muscle is by pole tower ground resistance 8 effective grounding;
Down conductor 6 one termination iron cross arm 2, one end effective grounding; Down conductor is arranged a switch.
(2) copper cash is laid first separately by iron cross arm and anchor ear ground connection, impulse voltage generator high-voltage connection and analog conducting wire one end are electrically connected, employing waveform parameter is that the negative polarity lightning wave of 1.2/50 μ s carries out 30 lightning impulse tests by lifting and lowering method, record test data and photo, should reduce the interference of external factor as far as possible; Then anchor ear is removed, observe anchor ear binding place 10kV cement shaft tower with or without damage vestige, if vestige is not obvious, one deck blank sheet of paper auxiliary observation experimental phenomena can be wrapped up at anchor ear place.
(3) anchor ear is then reduced, by the down conductor laid separately in switch cutoff step (2), same employing waveform parameter is the negative polarity lightning wave of 1.2/50 μ s, boosted voltage gradually, until 10kV circuit surge arrester with external series gaps generation electric discharge phenomena, record test data and photo; Keep voltage constant, after carrying out 30 lightning impulse tests, observe anchor ear binding place 10kV cement shaft tower with or without damage vestige.
(4) repairing experiment data, comparative analysis 10kV leakage conductor with or without during independent grounding downlead on the impact of 10kV cement shaft tower dielectric strength and protection of arrester effect, and draw rational conclusion.

Claims (1)

1. be applicable to the test method studying 10kV leakage conductor Contact patch, it is characterized in that, the step of described method is as follows:
(1) 10kV distribution line test model is built, selected device model should conform to actual track, and model is arranged and comprised 10kV cement shaft tower, iron cross arm and anchor ear, 10kV line insulator, 10kV circuit surge arrester with external series gaps, analog conducting wire, down conductor, impulse voltage generator, pole tower ground resistance; The effective grounding all the time of cement shaft tower internal steel muscle;
Hanging holds up cement shaft tower, is fixed on 10kV cement shaft tower by iron cross arm by anchor ear;
Described 10kV line insulator base is fixed on iron cross arm, and analog conducting wire is bundled in 10kV line insulator upper end, and 10kV circuit surge arrester with external series gaps is installed in parallel in 10kV line insulator both sides according to corresponding requirements;
Described impulse voltage generator high-voltage connection and analog conducting wire one end are electrically connected, and cement shaft tower internal steel muscle is by pole tower ground resistance effective grounding;
Described down conductor one termination iron cross arm, one end effective grounding; Down conductor is arranged a switch;
(2) copper cash is laid separately by iron cross arm and anchor ear ground connection, impulse voltage generator high-voltage connection and analog conducting wire one end are electrically connected, employing waveform parameter is that the negative polarity lightning wave of 1.2/50 μ s carries out 30 lightning impulse tests by lifting and lowering method, record test data and photo, should reduce the interference of external factor as far as possible; Then anchor ear is removed, observe anchor ear binding place cement shaft tower with or without damage vestige, if vestige is not obvious, one deck blank sheet of paper auxiliary observation experimental phenomena can be wrapped up at anchor ear place;
(3) reduction anchor ear, by the down conductor laid separately in switch cutoff step (2), same employing waveform parameter is the negative polarity lightning wave of 1.2/50 μ s, boosted voltage gradually, until 10kV circuit surge arrester with external series gaps generation electric discharge phenomena, record test data and photo; Keep voltage constant, after carrying out 30 lightning impulse tests, observe anchor ear binding place 10kV cement shaft tower with or without damage vestige;
(4) repairing experiment data, comparative analysis 10kV leakage conductor with or without during independent grounding downlead on the impact with surge arrester with external series gaps protected effect of 10kV cement shaft tower dielectric strength and 10kV circuit, 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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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106207510A (en) * 2016-08-26 2016-12-07 张振堂 A kind of high voltage transmission line grounding-for-lightning device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1120502A (en) * 1994-07-15 1996-04-17 本田技研工业株式会社 Structure of front body of small motor
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
WO2014191605A1 (en) * 2013-05-30 2014-12-04 Aplicaciones Tecnologicas, S.A. Testing method and apparatus for a lightning arrester

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1120502A (en) * 1994-07-15 1996-04-17 本田技研工业株式会社 Structure of front body of small motor
WO2014191605A1 (en) * 2013-05-30 2014-12-04 Aplicaciones Tecnologicas, S.A. Testing method and apparatus for a lightning arrester
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106207510A (en) * 2016-08-26 2016-12-07 张振堂 A kind of high voltage transmission line grounding-for-lightning device

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