CN101714758A - Method for solving tripping operation of low-voltage distribution intelligent main switch or frequency convertor caused by thunder - Google Patents
Method for solving tripping operation of low-voltage distribution intelligent main switch or frequency convertor caused by thunder Download PDFInfo
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- CN101714758A CN101714758A CN200910114609A CN200910114609A CN101714758A CN 101714758 A CN101714758 A CN 101714758A CN 200910114609 A CN200910114609 A CN 200910114609A CN 200910114609 A CN200910114609 A CN 200910114609A CN 101714758 A CN101714758 A CN 101714758A
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- 238000009826 distribution Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000001012 protector Effects 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000001681 protective effect Effects 0.000 abstract description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 23
- 229960001296 zinc oxide Drugs 0.000 description 12
- 239000011787 zinc oxide Substances 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 3
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 3
- 206010042255 Struck by lightning Diseases 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The invention discloses a method for solving tripping operation of a low-voltage distribution intelligent main switch or a frequency convertor caused by thunder and a low-voltage distribution intelligent main switch cabinet or a frequency convertor control cabinet with thunder protection capability. A power supply surge protection device is connected in parallel between each phase wire, each zero wire and each protective grounding wire in the low-voltage distribution intelligent main switch cabinet or the frequency convertor control cabinet; the side of non-protective grounding wire of the surge protection device is connected between the intelligent switch input side in the low-voltage distribution intelligent main switch cabinet or the frequency convertor control cabinet and a power supply inlet-wire end. The method of the invention is simple, but can limit instant overvoltage caused by the thunder within the voltage limiting value born by the intelligent main switch or electronic control components in the frequency convertor, and solve the problem that the tripping operation of the low-voltage distribution intelligent main switch or the frequency convertor caused by thunder, which cannot be solved for long time, thereby ensuring the normal and safe production of industrial enterprises.
Description
Technical field
The present invention relates to the lightning protection method and the device of intelligent electric product in the low-voltage distribution system, more particularly provide the method that a kind of solution causes low-voltage distribution intelligent main switch or frequency converter to trip because of thunder and lightning, and a kind of low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet with lightning protection ability.
Background technology
At China's thunder and lightning is a kind of serious natural calamity, threaten the human life and the safety of property constantly, 2004 to 2007 is annual because the thunder and lightning disaster is made the accident number of times that loses more than millions of units and reached more than 45 times every year according to statistics, and therefore improving good lightning protection measure is the best method that reduces the thunder and lightning disaster; Before the nineties in 20th century, the lightening protection engineering major part of China concentrates on industrial and mining enterprises, civil building, electric power etc. are subjected to the serious industry of thunder disaster, the shocking preventing technology measure mainly is to hit and the circuit Lightning Over-voltage to take precautions against direct lightning strike, and at present along with the intelligent electric product based on microelectric technique, the high development of computer information network system, as the low-voltage distribution intelligent main switch that adopts microelectric technique to control, frequency converter and computer system device etc., they are being produced, be used widely in life each side field, the technical quality and the managerial skills of factory and enterprise low-voltage distribution system product have greatly been improved, but because the anti-overvoltage level of microelectronic chip is low, make the infringement that they very easily are struck by lightning, cause the breaking-up of intelligent electric product, seriously influence the ordinary production and the operation of factory and enterprise.Therefore, strengthening the defence of thunder and lightning disaster, take the intelligent electric product of new lightning protection technical protection, alleviate thunder and lightning to greatest extent to the harm that factory and enterprise causes, is an instant task.
At present on low-voltage distribution system lightning protection method; most of capital equipment that adopts single valve type or zinc oxide arrester to attack as anti-thunder and lightning; because the condition restriction of valve type or zinc oxide arrester self product; as the capacity that circulates is little; thunderbolt back residual voltage is high; can only can not carry out lightning protected to the electric product of intellectuality effectively as traditional heavy current installation extensive style protection.For example we just find in practice, trip phenomenon takes place in intelligent switch control system in low-voltage distribution intelligent main switch or the frequency converter easily when thunderbolt, even if taked increase ground network, changed the grounded metal material to reduce measure such as earth resistance as much as possible, this phenomenon still can't effectively be improved.
Summary of the invention
For solving at present on low-voltage distribution system lightning protection method; can not carry out lightning protected problem to the electric product of intellectuality effectively; purpose of the present invention promptly is to provide a kind of lightning protection technical scheme at the electric product of intellectuality, solves the method and apparatus that causes low-voltage distribution system intelligent main switch or frequency converter tripping operation because of thunder and lightning.
The inventor finds that the high residual voltage after thunder and lightning hits is to cause the main cause of the intelligent switch control system tripping operation in low-voltage distribution system intelligent main switch or the frequency converter.Because this high residual voltage has just caused the tripping operation of intelligent main switch or frequency converter far above the design voltage of intelligent switch in low-voltage distribution system intelligent main switch or the frequency converter.For this reason, the present invention solves because of thunder and lightning causes the method for low-voltage distribution intelligent main switch or frequency converter tripping operation and is: between each phase line in low-voltage distribution intelligent main switch or frequency converter, zero line and protection ground wire, and the power surge protector that inserts in parallel; The non-protection ground wire side of described surge protector is connected between the intelligent switch input side and power inleting terminal in described low-voltage distribution intelligent main switch cabinet or the Frequency Converter Control cabinet.The voltage protection level of described surge protector can be selected≤1.5kV (20kA, 8/20 μ s).
Another object of the present invention, be to provide a kind of low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet with lightning protection ability: the input of described low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet is connected to power supply, and output is connected to load; Be provided with intelligent switch and control circuit thereof in described low-voltage distribution intelligent main switch or the frequency converter; Its special feature is, between each phase line in low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet, zero line and protection ground wire, and is connected with power surge protector; The non-protection ground wire side of described surge protector is connected between the intelligent switch input side and power inleting terminal in described low-voltage distribution intelligent main switch cabinet or the Frequency Converter Control cabinet.The voltage protection level selection≤1.5kV of described surge protector (20kA, 8/20 μ s).
The characteristics big at the thunder and lightning energy, that harm is big; cooperation is to protect in the traditional valve type at low-voltage distribution master switch place or the first order of zinc oxide arrester; the present invention installs surge protector and protects as the second level in low-voltage distribution intelligent main switch or frequency converter cabinet; utilize that Surge Protective Device's Residual Voltage is low, response speed is fast, the characteristics capacious that circulate, and has formed the two-stage protection of valve type or zinc oxide arrester and surge protector in low-voltage distribution system.When thunder and lightning took place, lightning wave was at first through first step valve type or the zinc oxide arrester, and the high voltage of lightning wave punctures valve type or Zinc-oxide piezoresistor, and lightning current flows into the earth by piezo-resistance, and this moment, the lightning current energy obtained bigger release; After lightning wave releases energy once more through the second level of the present invention surge protector; the instantaneous overvoltage that the residue thunder and lightning produces effectively is limited in the range of voltage values that low-voltage distribution intelligent main switch or frequency converter electronic control component can bear; can protect low-voltage distribution intelligent main switch or frequency converter not destroyed; solve the problem that causes intelligent main switch or frequency converter tripping operation because of thunder and lightning, reached the purpose that guarantees industrial enterprise's ordinary production life.
Experimental results show that, such solution is compared employing replacing or raising low-voltage distribution intelligent main switch or frequency inverter capacity and withstand voltage level (can not reach fully sometimes) or is adopted by earth resistance being reduced the methods that reach the reduction overvoltage level, more economically, rationally, effectively more.Though the inventive method is simple, overcome the prejudice of persons skilled in the art, solved conscientiously fail for a long time effectively to solve cause the problem of low-voltage distribution intelligent main switch or frequency converter tripping operation because of effects of lightning.
Power surge protector described in the present invention can be box or modular, and functions such as configuration effort indication, faulty indication, thunderbolt register, remote signalling interface and deterioration indication; Adopt temperature control circuit breaker technology, built-in current foldback circuit, thread off automatically during deterioration; Have the advantages that residual voltage is low, response speed fast, the circulation capacity is big, the life-span is long.
Description of drawings
Fig. 1 uses the electric logic schematic diagram of low-voltage distribution system that the intelligent electric product lightning protection method of the present invention is arranged.
Fig. 2 is the structural representation of an embodiment of the low-voltage distribution intelligent main switch cabinet of the present invention with lightning protection ability.
Fig. 3 is the structural representation of an embodiment of the Frequency Converter Control cabinet of the present invention with lightning protection ability.
Description of reference numerals:
1 air circuit 2-intelligent switch 3-fuse 4-zinc oxide arrester
5-surge protector 6-electrical grounding terminal board 7-decoupling device 8-isolating switch
Embodiment
Below in conjunction with accompanying drawing the present invention is solved the method that causes low-voltage distribution intelligent main switch or frequency converter tripping operation because of thunder and lightning, and low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet with lightning protection ability are further described.(enterprise produce and engineering practice in, usually low-voltage distribution intelligent main switch and affiliated facility thereof are united and form cabinet and be referred to as the low-voltage distribution intelligent main switch cabinet; Similarly, frequency converter and affiliated facility thereof are united form cabinet and be referred to as the Frequency Converter Control cabinet.)
Fig. 1 uses the electric logic schematic diagram of low-voltage distribution system that the intelligent electric product lightning protection method of the present invention is arranged.
Fig. 2 is the structural representation of an embodiment of the low-voltage distribution intelligent main switch cabinet of the present invention with lightning protection ability.
Fig. 3 is the structural representation of an embodiment of the Frequency Converter Control cabinet of the present invention with lightning protection ability.
As figure; it is lightning protected that low-voltage distribution system is provided with two-stage; adopt traditional valve type or zinc oxide arrester 4 as first order lightning protection at low-voltage distribution master switch place, the surge protector 5 of installing in low-voltage distribution intelligent main switch or frequency converter cabinet of the present invention is as second level lightning protection.In Fig. 1 to Fig. 3, the inventive method participates in the lightning protection of low-voltage distribution system as second level protection, its concrete scheme is: the input of described low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet is connected to the output of previous stage, and its output is connected to load; Between each phase line in low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet, zero line and protection ground wire, the power surge protector 5 that inserts in parallel; The non-protection ground wire side of described surge protector 5 is connected between the input side and power inleting terminal of the intelligent switch 2 in described low-voltage distribution intelligent main switch cabinet or the Frequency Converter Control cabinet.The voltage protection level selection≤1.5kV of described surge protector 5 (20kA, 8/20 μ s).
Shown among each figure, also according to national standard and industrial practice and standard, look concrete situation configuration fuse 3, electrical grounding terminal board 6, decoupling device 7 and isolating switch 8 etc. be installed.
Embodiment one: the situation (referring to Fig. 2) that adopts the low-voltage distribution intelligent main switch cabinet
It is lightning protected that this low-voltage distribution system is established two-stage,
(1), traditional valve type or zinc oxide arrester are installed as first order lightning protection at low-voltage distribution master switch place:
As adopt valve-type arrester, can select following parameter:
Electric power system rated voltage: 0.38kV
Lightning arrester rated voltage: 0.5kV
Nominal discharge current (8/20) us: residual voltage value ≯ 3.0kV
As adopt zinc oxide arrester, can select following parameter:
Electric power system rated voltage: 0.38kV
Lightning arrester rated voltage: 0.5kV
Nominal discharge current (8/20) us: residual voltage value ≯ 2.4kV
(2) in the low-voltage distribution intelligent main switch cabinet, surge protector is installed as second level lightning protection:
Surge protector can be selected following parameter:
Electric power system rated voltage: 0.38kV
Surge protector rated voltage: 0.38kV
Nominal discharge current (8/20) us: overvoltage protection level (residual voltage value) ≯ 1.5kV
Embodiment two: the situation (referring to Fig. 3) that adopts the frequency converter cabinet
It is lightning protected that this low-voltage distribution system is established two-stage:
(1), traditional valve type or zinc oxide arrester are installed as first order lightning protection at low-voltage distribution master switch place;
As adopt valve-type arrester, can select following parameter:
Electric power system rated voltage: 0.38kV
Lightning arrester rated voltage: 0.5kV
Nominal discharge current (8/20) us: residual voltage value ≯ 3.0kV
As adopt zinc oxide arrester, can select following parameter:
Electric power system rated voltage: 0.38kV
Lightning arrester rated voltage: 0.5kV
Nominal discharge current (8/20) us: residual voltage value ≯ 2.4kV
(2) in the frequency converter cabinet, surge protector is installed as second level lightning protection:
Surge protector can be selected following parameter:
Electric power system rated voltage: 0.38kV
Surge protector rated voltage: 0.38kV
Nominal discharge current (8/20) us: overvoltage protection level (residual voltage value) ≯ 1.5kV
Among the embodiment shown in Figure 3, also be provided with many places fuse 3, electrical grounding terminal board 6, decoupling device 7 and isolating switch 8 etc. are installed.Isolating switch 8, level is isolated before and after being used for, and is convenient to carry out the Maintenance and Repair of equipment.
Above-mentioned surge protector can be selected to adopt box or modular.The for example DK-380AC100 (C type in parallel) of the triumphant lightening protection engineering in Guangxi ground Co., Ltd or DK-380AC100 (II type in parallel) etc.
Claims (4)
1. solve the method that causes low-voltage distribution intelligent main switch or frequency converter tripping operation because of thunder and lightning, this low-voltage distribution intelligent main switch or frequency converter are provided with intelligent switch and control circuit thereof, it is characterized in that: between each phase line in described low-voltage distribution intelligent main switch or frequency converter, zero line and protection ground wire, the power surge protector that inserts in parallel; Between the intelligent switch input side and power inleting terminal of the non-protection ground wire side joint of described surge protector to described low-voltage distribution intelligent main switch or the frequency converter.
2. solution according to claim 1 is characterized in that because of thunder and lightning causes the method for low-voltage distribution intelligent main switch or frequency converter tripping operation: described surge protector select voltage protection level≤1.5kV (20kA, 8/20 μ s) for use.
3. have the low-voltage distribution intelligent main switch cabinet or a Frequency Converter Control cabinet of lightning protection ability, the input of described low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet is connected to power supply, and output is connected to load; Be provided with intelligent switch and control circuit thereof in described low-voltage distribution intelligent main switch or the frequency converter; It is characterized in that: between each phase line in described low-voltage distribution intelligent main switch cabinet or Frequency Converter Control cabinet, zero line and protection ground wire, and be connected with power surge protector; Between the intelligent switch input side and power inleting terminal of the non-protection ground wire side joint of described surge protector to described low-voltage distribution intelligent main switch cabinet or the Frequency Converter Control cabinet.
4. the low-voltage distribution intelligent main switch cabinet of tool lightning protection ability according to claim 3 or Frequency Converter Control cabinet is characterized in that: the selection voltage protection level≤1.5kV of described surge protector (20kA, 8/20 μ s).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910114609A CN101714758A (en) | 2009-12-04 | 2009-12-04 | Method for solving tripping operation of low-voltage distribution intelligent main switch or frequency convertor caused by thunder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910114609A CN101714758A (en) | 2009-12-04 | 2009-12-04 | Method for solving tripping operation of low-voltage distribution intelligent main switch or frequency convertor caused by thunder |
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| CN101714758A true CN101714758A (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910114609A Pending CN101714758A (en) | 2009-12-04 | 2009-12-04 | Method for solving tripping operation of low-voltage distribution intelligent main switch or frequency convertor caused by thunder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102227050A (en) * | 2011-04-05 | 2011-10-26 | 太原罗克佳华工业有限公司 | Switch cabinet secondary circuit shielding grounding circuit |
| CN104332982A (en) * | 2014-11-25 | 2015-02-04 | 国家电网公司 | Lightning protection system |
-
2009
- 2009-12-04 CN CN200910114609A patent/CN101714758A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102227050A (en) * | 2011-04-05 | 2011-10-26 | 太原罗克佳华工业有限公司 | Switch cabinet secondary circuit shielding grounding circuit |
| CN102227050B (en) * | 2011-04-05 | 2015-04-08 | 太原罗克佳华工业有限公司 | Switch cabinet secondary circuit shielding grounding circuit |
| CN104332982A (en) * | 2014-11-25 | 2015-02-04 | 国家电网公司 | Lightning protection system |
| CN104332982B (en) * | 2014-11-25 | 2017-12-19 | 国家电网公司 | A kind of lightning protection protective system |
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Application publication date: 20100526 |