CN103944070B - Simple and easy overvoltage protection - Google Patents

Simple and easy overvoltage protection Download PDF

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Publication number
CN103944070B
CN103944070B CN201410143128.3A CN201410143128A CN103944070B CN 103944070 B CN103944070 B CN 103944070B CN 201410143128 A CN201410143128 A CN 201410143128A CN 103944070 B CN103944070 B CN 103944070B
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CN
China
Prior art keywords
phase post
gap
post insulator
overvoltage
overvoltage protection
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201410143128.3A
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Chinese (zh)
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CN103944070A (en
Inventor
李宏力
吴建国
邓朴
桂腾
王丰元
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Duyun Power Supply Bureau of Guizhou Power Grid Co Ltd
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Duyun Power Supply Bureau of Guizhou Power Grid Co Ltd
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Priority to CN201410143128.3A priority Critical patent/CN103944070B/en
Publication of CN103944070A publication Critical patent/CN103944070A/en
Application granted granted Critical
Publication of CN103944070B publication Critical patent/CN103944070B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The invention discloses one and the invention discloses simple and easy overvoltage protection, conducting bracket arranges three phase post insulators, on three phase post insulators, install atmospherical discharges gap, portable protective gaps and alternate discharging gap respectively.One end between air-gap is directly connected with high-pressure system by the present invention, and the other end is connected with conducting bracket by portable protective gaps, and conducting bracket connects and is connected with the ground network of transformer station; Alternate discharging gap by alternate overvoltage Limiting in allowed limits, solves the overvoltage injury that arc furnace work time-harmonic wave overvoltage causes substation equipment, effectively protects expensive equipment in transformer station.The present invention is simple for structure, easy to make, characteristics of compact layout, and result of use is good.

Description

Simple and easy overvoltage protection
Technical field
The present invention relates to technical field of electric power, especially a kind of simple and easy overvoltage protection.
Background technology
From 2003, after a large amount of ac arc furnace pours in Guizhou Power Grid, because these ac arc furnace loads do not install corresponding filter apparatus and the corresponding reactive power compensator of configuration additional according to national standard, the harmonic injection electrical network that exceeds standard in a large number produced when causing arc furnace to work, severe contamination is caused to electrical network, frequent initiation overvoltage (this overvoltage may be relatively, also may be alternate), causes electrical network to be short-circuited or device damage accident.The overvoltage protection performance of existing lightning arrester similarity is poor, can not meet instructions for use.
Summary of the invention
The object of the invention is: provide a kind of simple and easy overvoltage protection, the overvoltage level produced when arc furnace can work by it is limited within the safe range of setting, guarantees the safe operation of grid equipment, to overcome the deficiencies in the prior art.
The present invention is achieved in that simple and easy overvoltage protection, comprises conducting bracket, and conducting bracket is provided with 3 A phase post insulators, 2 B phase post insulators, and 3 C phase post insulators; Atmospherical discharges gap is provided with between two post insulators of homophase; Conducting bracket is provided with conduction round steel, conduction round steel and respectively form portable protective gaps between post insulator; Alternate discharging gap is equipped with between A phase post insulator and B phase post insulator, between B phase post insulator and C phase post insulator and between A phase post insulator and C phase post insulator.
Atmospherical discharges gap is arranged horizontally, and its shape is dihedral, is made up of hot galvanizing round steel.The distance in atmospherical discharges gap should meet " overvoltage protection of alternating-current electric device and insulation coordination " (DL/T620-1997) and specify accordingly.
Portable protective gaps is arranged horizontally, and its shape is dihedral or clavate, is made up of hot galvanizing round steel.The distance of portable protective gaps should meet " overvoltage protection of alternating-current electric device and insulation coordination " (DL/T620-1997) and specify accordingly.
Alternate discharging gap is arranged horizontally, and its shape is clavate, is made by Hot-dip zinc-coated flat steel sheet and round steel.The distance of alternate discharging gap should be checked according to the regulation in " overvoltage protection of alternating-current electric device and insulation coordination ".
Owing to have employed technique scheme, compared with prior art, the one end between air-gap is directly connected with high-pressure system by the present invention, and the other end is connected with conducting bracket by portable protective gaps, and conducting bracket connects and is connected with the ground network of transformer station; Alternate discharging gap by alternate overvoltage Limiting in allowed limits, solves the overvoltage injury that arc furnace work time-harmonic wave overvoltage causes substation equipment, effectively protects expensive equipment in transformer station.The present invention is simple for structure, easy to make, characteristics of compact layout, and result of use is good.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present invention;
Accompanying drawing 2 is the end view of accompanying drawing 1;
Accompanying drawing 3 is the vertical view of accompanying drawing 1.
Embodiment
Embodiments of the invention: the structure of simple and easy overvoltage protection as shown in Figure 1, comprises conducting bracket 1, conducting bracket 1 is provided with 3 A phase post insulator 2-A, 2 B phase post insulator 2-B, and 3 C phase post insulator 2-C; Atmospherical discharges gap S1 is provided with between two post insulators of homophase; Conducting bracket 1 is provided with conduction round steel 3, between conduction round steel 3 and each phase post insulator, forms portable protective gaps S2; Alternate discharging gap S3 is equipped with between A phase post insulator 2-A and B phase post insulator 2-B, between B phase post insulator 2-B and C phase post insulator 2-C and between A phase post insulator 2-A and C phase post insulator 2-C; 3rd A phase post insulator 2-A and the top of A phase post insulator 2-A arranging atmospherical discharges gap S1 realize conducting electricity by hot galvanizing round steel and are connected, and the 3rd C phase post insulator 2-C and the top of C phase post insulator 2-C arranging atmospherical discharges gap S1 realize conducting electricity by hot galvanizing round steel and be connected, alternate discharging gap S3 is set between the 3rd A phase post insulator 2-A and a 3rd C phase post insulator 2-C.
Atmospherical discharges gap S1 is arranged horizontally, and its shape is dihedral, is made up of hot galvanizing round steel.The distance in atmospherical discharges gap should meet " overvoltage protection of alternating-current electric device and insulation coordination " (DL/T620-1997) and specify accordingly; Portable protective gaps S2 is arranged horizontally, and its shape is dihedral or clavate, is made up of hot galvanizing round steel.The distance of portable protective gaps should meet " overvoltage protection of alternating-current electric device and insulation coordination " (DL/T620-1997) and specify accordingly; Alternate discharging gap S3 is arranged horizontally, and its shape is clavate, is made by Hot-dip zinc-coated flat steel sheet and round steel.The distance of alternate discharging gap S3 should be checked according to the regulation in " overvoltage protection of alternating-current electric device and insulation coordination ".
In the present embodiment, conducting bracket 1 adopts Thermal zinc plating bath steel to make, and conduction round steel 3 adopts hot galvanizing round steel to make.
The step that the present invention uses is as follows:
1st step: need the electric pressure determining connecting system of the present invention.The rated voltage of selection post insulator should be identical with the voltage of arc furnace mains side.In the present embodiment, the voltage of arc furnace mains side is 35kV, then the post insulator of the present embodiment should select the outdoor shape (as then selecting 35kV indoor shape when being arranged on indoor) of 35kV.
2nd step: the portable protective gaps and auxiliary gap that discharge over the ground are set according to table 5 in " overvoltage protection of alternating-current electric device and insulation coordination " and table 6.Table look-up air discharging gap S1 is 210mm, portable protective gaps S2 is 20mm.
For preventing rainwater or ice and snow from causing atmospherical discharges gap S and portable protective gaps S2 short circuit, atmospherical discharges gap S and portable protective gaps S2 being set to horizontal mode and arranging.
3rd step: insulation coordination calculates.
According to the regulation of 10.1.10 bar in " overvoltage protection of alternating-current electric device and insulation coordination ", it calculates over the ground and by maximum switching overvoltage level is:
3.2×35/1.732≈65kV
Because the numerical value of clearance to ground provides in standard, therefore do not need to veritify further.Its alternate switching overvoltage level is:
(1.3-1.4) × 65 ≈ 85kV(get 1.3 times of phase-to-ground voltages and calculate)
Because the numerical value of alternate discharging gap S3 is without standard, therefore need to veritify further.According to result of the test, the discharging gap distance under 85kV voltage is: 200mm(relative temperature 90%), for the sake of assurance, get 250mm(relative temperature 90%, puncture voltage is 96kV).
4th step: according to result of calculation, produces the three-phase equipment (as shown in Figure 3) of the present embodiment.
5th step: A, B, C point in top view of the present invention is reliably connected with A, B, C three-phase of three-phase electrical power system respectively (being installed on the appropriate location of arc furnace user by grid side).Attention: the earth resistance of equipment mounting points ground network should be not more than 4 ohm.
6th step: produce overvoltage to grid side transmission when arc furnace work; and during the numerical value that this overvoltage level sets more than the 3rd step, gap is breakdown, the energy that overvoltage produces is released; make overvoltage be delivered to grid side, thus reach the object of protection grid equipment.Attention: when alternate overvoltage causes that between alternate discharge gap, S3 is breakdown (being now phase fault), to be tripped this load of excision by the primary cut-out being installed on grid side; When relatively overvoltage action causes atmospherical discharges gap S1 breakdown; portable protective gaps S2 is simultaneously inevitable breakdown; the energy that overvoltage produces flows into the earth by atmospherical discharges gap S1 and portable protective gaps S2 and is released (not interrupting the power supply to arc furnace user); electric arc automatic distinguishing after overvoltage terminates, System recover normally runs.

Claims (4)

1. a simple and easy overvoltage protection, comprises conducting bracket (1), it is characterized in that: on conducting bracket (1), be provided with 3 A phase post insulators (2-A), 2 B phase post insulators (2-B), and 3 C phase post insulators (2-C); Atmospherical discharges gap (S1) is provided with between two post insulators of homophase; Conducting bracket (1) is provided with conduction round steel (3), between conduction round steel (3) and each phase post insulator, forms portable protective gaps (S2); Alternate discharging gap (S3) is equipped with between A phase post insulator (2-A) and B phase post insulator (2-B), between B phase post insulator (2-B) and C phase post insulator (2-C) and between A phase post insulator (2-A) and C phase post insulator (2-C).
2. simple and easy overvoltage protection according to claim 1, is characterized in that: atmospherical discharges gap (S1) is arranged horizontally, and its shape is dihedral, and the two poles of the earth forming atmospherical discharges gap (S1) are made up of hot galvanizing round steel.
3. simple and easy overvoltage protection according to claim 1, is characterized in that: portable protective gaps (S2) is arranged horizontally, and its shape is dihedral or clavate, and the two poles of the earth forming portable protective gaps (S2) are made up of hot galvanizing round steel.
4. simple and easy overvoltage protection according to claim 1, is characterized in that: alternate discharging gap (S3) is arranged horizontally, and its shape is clavate, and the two poles of the earth forming alternate discharging gap (S3) are made by Hot-dip zinc-coated flat steel sheet and round steel.
CN201410143128.3A 2014-04-11 2014-04-11 Simple and easy overvoltage protection Expired - Fee Related CN103944070B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410143128.3A CN103944070B (en) 2014-04-11 2014-04-11 Simple and easy overvoltage protection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410143128.3A CN103944070B (en) 2014-04-11 2014-04-11 Simple and easy overvoltage protection

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CN103944070A CN103944070A (en) 2014-07-23
CN103944070B true CN103944070B (en) 2016-03-09

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108321783A (en) * 2018-01-25 2018-07-24 国网浙江省电力有限公司电力科学研究院 Inhibit the interphase overvoltage protector of switching shunt reactor overvoltage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2888710Y (en) * 2006-03-06 2007-04-11 新乡市电业局电力修试安装公司 Neutral point protector for 110KV or 220KV transformer
CN200994065Y (en) * 2006-12-30 2007-12-19 武汉雷泰电力科技发展有限公司 Controllable discharge circuit overvoltage protector
DE102007030344B4 (en) * 2007-06-29 2009-10-15 Andreas Siemes Device for controlling a soft start or run-down of three-phase motors, - so-called soft starters
US7697252B2 (en) * 2007-08-15 2010-04-13 Leviton Manufacturing Company, Inc. Overvoltage device with enhanced surge suppression
CN201149997Y (en) * 2008-01-29 2008-11-12 张锦祥 Three-phase combined overvoltage protector with clearance
CN203218844U (en) * 2013-05-06 2013-09-25 西安博隆电气有限责任公司 35kV outdoor alternating current three phase combination type lightning arrester
CN203774609U (en) * 2014-04-11 2014-08-13 都匀供电局 Simple overvoltage protection device

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