CN202949205U - Lightning arrester overvoltage protection device with variable voltage ratio - Google Patents
Lightning arrester overvoltage protection device with variable voltage ratio Download PDFInfo
- Publication number
- CN202949205U CN202949205U CN 201220374886 CN201220374886U CN202949205U CN 202949205 U CN202949205 U CN 202949205U CN 201220374886 CN201220374886 CN 201220374886 CN 201220374886 U CN201220374886 U CN 201220374886U CN 202949205 U CN202949205 U CN 202949205U
- Authority
- CN
- China
- Prior art keywords
- lightning arrester
- parallel
- thyristor
- detection system
- fault detection
- Prior art date
- 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
Links
- 238000001514 detection method Methods 0.000 claims abstract description 35
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011787 zinc oxide Substances 0.000 claims abstract description 13
- 230000001052 transient effect Effects 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 229960001296 zinc oxide Drugs 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 208000033999 Device damage Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Abstract
The utility model, which belongs to the field of the power electronic technology, provides a lightning arrester overvoltage protection device with a variable voltage ratio. The device comprises a lightning arrester series connection group, a thyristor system and a fault detection system; the thyristor system is connected in parallel with lightning arresters in the lightning arrester series connection group; and the fault detection system and the lightning arrester series connection group are connected in parallel. And the lightning arresters are zinc-oxide lightning arresters. According to the utility model, the less components are used; the structure of the device is simple; and the occupied area is small. In addition, the costs of the used power electronic devices are low, thereby reducing the comprehensive cost of the integrated device. Therefore, the economy and practicality are both taken into consideration, thereby realizing a good application prospect of the device.
Description
Technical field
The utility model belongs to electric and electronic technical field, is specifically related to the variable lightning arrester over-pressure safety device of a kind of pressure ratio.
Background technology
Overvoltage refers to due to internal fault, switching manipulation or is struck by lightning, and causes instantaneous or long-term higher than the specified permission voltage of electrical network and may cause the voltage that electric device damages to raise.Restriction transmission system overvoltage is for reducing project cost and guaranteeing that system safety stable operation is significant.In circuit on power system, need limit Frequency Transient Overvoltage, all types of switching overvoltages (comprises circuit and transformer station's closing overvoltage, circuit single-phase reclose overvoltage, line-to-ground fault occur and eliminate overvoltage and off-the-line overvoltage), the research of the measures such as system thunder defending, recovery voltage.In the occasion of some precision equipment operations, if the overvoltage fault occurs, not only the possibility damage equipment, make the equipment ineffective treatment, also can produce a very large impact system line simultaneously, brings serious loss.For protection equipment normally moves, need the overvoltage of limiting device.It is zinc oxide arrester that present overvoltage protection device mainly adopts metal oxide to cross depressor.
Metal oxide arrester (zinc oxide arrester) is to develop from valve type arrester; it is the lightning arrester of present performance the best; because of its good nonlinear characteristic, both can be used as the lightning protection device of power transmission line, transformer station, also can be used as the protective device of line over-voltage.Residual voltage under the zinc oxide arrester nominal current and the ratio of nominal voltage are pressure ratio.For transmission line, pressure ratio ratio is less in theory, and lightning arrester is non-linear better, and protective value is better.Pressure ratio depends on the manufacturing level of lightning arrester, and zinc oxide arrester internal structure main body is the piezo-resistance of multicolumn parallel connection, can reduce pressure ratio by increasing the parallel column number or increasing the resistor disc diameter, but corresponding technological level requires high, expensive.
Zinc oxide arrester internal structure main body is the piezo-resistance of multicolumn parallel connection, make take zinc oxide as material of main part, its voltage nonlinearity is high, capacity is large, residual voltage is low, leakage current is little, without afterflow, voltage-current characteristic are symmetrical, voltage range is wide, fast response time, voltage temperature coefficient are little, and have the advantages such as technique is simple, with low cost.In the voltage-current characteristic of zinc oxide resistance sheet, magnitude of voltage is during lower than puncture voltage, resistor disc is close to insulator, the electric current that flows through is very little, when applied voltage during higher than puncture voltage, the electric current that flows through resistor disc sharply increases with the increase of voltage, even reaches the increase of several orders of magnitude, shows very strong non-linear relation.When current flowing density＞10
3A/cm
2The time, voltage-current characteristic reaches large Current rise district.Mainly use its good nonlinear characteristic when adopting the zinc oxide arrester overvoltage.When the overvoltage fault occured, the lightning arrester in parallel with equipment can effectively absorb large electric current, and the equipment voltage of making remains on certain value, avoided overvoltage and the rush of current of equipment.
The key property that characterizes zinc oxide arrester has: the highest power frequency voltage effective value that allows to be applied between lightning arrester two ends is rated voltage, is determined by the system transient modelling overvoltage; The highest power frequency voltage effective value that allows to be applied to lastingly between lightning arrester two ends is continuous operating voltage; Residual voltage under nominal current and the ratio of nominal voltage are pressure ratio; The maximum that allows to be applied to lastingly the highest power-frequency voltage between lightning arrester two ends is chargeability to the ratio of power frequency reference voltage; Discharging current during by lightning arrester the maximum voltage value at its two ends be residual voltage.These parameters are all dispatch from the factory time regulations of lightning arrester, the reference value in the time of can only simulating the logical nominal impulse current of every piezoresistive wafer such as the residual voltage test.Adopt the higher lightning arrester of rated voltage as overvoltage protection, when having increased continuous operating voltage, residual voltage also correspondingly increases, and may the equipment of need protection be impacted.Take into full account with the system insulation mated condition after, the protective value of the lower lightning arrester of pressure ratio is better.
In the control of transmission line of alternation current, to compare with lightning arrester bypass modes such as mechanical switch and relays, anti-parallel thyristor has the advantages such as response is fast, easy to control, but positive and negative pulse triggering and conducting all, thereby its control circuit is fairly simple.The rated current of thyristor can reach kiloampere at present, has good registration property with lightning arrester.
The utility model content
In order to overcome above-mentioned the deficiencies in the prior art; the utility model provides a kind of pressure ratio variable lightning arrester over-pressure safety device; the use parts are less; simple in structure, floor space is little, in addition; install power electronic device cost used low; reduce the comprehensive cost of the complete sets of equipment, taken into account economy and practicality, had application prospect preferably.
To achieve these goals, the utility model is taked following scheme:
The lightning arrester over-pressure safety device that a kind of pressure ratio is variable, described lightning arrester comprises lightning arrester body, pressure-equalizing device and insulator foot; Described device comprises lightning arrester series connection group, thyristor system and fault detection system; The lightning arrester that described thyristor system connects with described lightning arrester in group is in parallel, the group parallel connection of connecting with described lightning arrester of described fault detection system, and described lightning arrester is zinc oxide arrester.
Described thyristor system comprises at least one anti-parallel thyristor and circuits for triggering thereof, and described circuits for triggering are in parallel with fault detection system.
Described lightning arrester series connection group is composed in series successively by two or more lightning arresters, a lightning arrester anti-parallel thyristor in parallel, and described lightning arrester series connection group is in parallel with protected equipment.
Described fault detection system comprises overvoltage detection system and over-current detection system; the overvoltage detection system group of connecting with described protected equipment and described lightning arrester is all in parallel, and the over-current detection system lightning arrester of anti-parallel thyristor in parallel of connecting with described lightning arrester in group is not connected.
Described anti-parallel thyristor is the inverse parallel gate level turn-off thyristor.
Described lightning arrester is metal oxide arrester.
The voltage magnitude at the protected equipment of described fault detection system on-line monitoring two ends and the current amplitude of lightning arrester branch road, if voltage magnitude surpasses definite value V1 or current amplitude when surpassing definite value A1, described fault detection system judges that the overvoltage fault appears in protected equipment, described circuits for triggering send triggering signal to the anti-parallel thyristor gate pole, control the anti-parallel thyristor conducting, the temporary transient short circuit lightning arrester in parallel with anti-parallel thyristor; When the overvoltage fault of protected equipment is got rid of; fault detection system detects the not current amplitude of the lightning arrester of anti-parallel thyristor in parallel of flowing through; the current amplitude of the lightning arrester of anti-parallel thyristor in parallel not is lower than definite value A2 if flow through; described circuits for triggering stop sending triggering signal; during voltage zero-cross, anti-parallel thyristor disconnects, and the lightning arrester of short circuit puts into operation again.
Compared with prior art, the beneficial effects of the utility model are:
1. use parts less, simple in structure, floor space is little;
2. install power electronic device cost used low, reduced the comprehensive cost of the complete sets of equipment, take into account economy and practicality, have application prospect preferably;
3. residual voltage of arrester when having limited fault can reduce pressure ratio, has improved the level of protection of lightning arrester, has improved system reliability, can directly apply to known excess voltage protection, will bring very large economic benefit;
4. the overvoltage protection to protected equipment is more effective, and control system is simple and easy to realize.
Description of drawings
Fig. 1 is the variable lightning arrester over-pressure safety device structure chart of pressure ratio in the embodiment of the present invention;
Fig. 2 is the variable lightning arrester over-pressure safety device fundamental diagram of pressure ratio in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As Fig. 1, the lightning arrester over-pressure safety device that a kind of pressure ratio is variable, described lightning arrester comprises lightning arrester body, pressure-equalizing device and insulator foot; Described device comprises lightning arrester series connection group, thyristor system and fault detection system; The lightning arrester that described thyristor system connects with described lightning arrester in group is in parallel, the group parallel connection of connecting with described lightning arrester of described fault detection system, and lightning arrester is zinc oxide arrester.
Described thyristor system comprises at least one anti-parallel thyristor and circuits for triggering thereof, and described circuits for triggering are in parallel with fault detection system.
Described lightning arrester series connection group is composed in series successively by two or more lightning arresters, a lightning arrester anti-parallel thyristor in parallel, and described lightning arrester series connection group is in parallel with protected equipment.
Described fault detection system comprises overvoltage detection system and over-current detection system; the overvoltage detection system group of connecting with described protected equipment and described lightning arrester is all in parallel, and the over-current detection system lightning arrester of anti-parallel thyristor in parallel of connecting with described lightning arrester in group is not connected.
Described anti-parallel thyristor is the inverse parallel gate level turn-off thyristor.
Described lightning arrester is metal oxide arrester.
As Fig. 2, operation principle is as follows: the voltage magnitude at the protected equipment of described fault detection system on-line monitoring two ends and the current amplitude of lightning arrester branch road, if voltage magnitude surpasses definite value V1 or current amplitude when surpassing definite value A1, described fault detection system judges that the overvoltage fault appears in protected equipment, described circuits for triggering send triggering signal to the anti-parallel thyristor gate pole, control the anti-parallel thyristor conducting, the temporary transient short circuit lightning arrester in parallel with anti-parallel thyristor; When the overvoltage fault of protected equipment is got rid of; fault detection system detects the not current amplitude of the lightning arrester of anti-parallel thyristor in parallel of flowing through; the current amplitude of the lightning arrester of anti-parallel thyristor in parallel not is lower than definite value A2 if flow through; described circuits for triggering stop sending triggering signal; during voltage zero-cross, anti-parallel thyristor disconnects, and the lightning arrester of short circuit puts into operation again.
Eventually the above, the variable lightning arrester overvoltage protection of this pressure ratio uses parts less, simple in structure, floor space is little; Residual voltage of arrester when having limited fault can reduce pressure ratio, has improved the level of protection of lightning arrester, has improved system reliability, can directly apply to known excess voltage protection, will bring very large economic benefit; Install power electronic device cost used low, reduced the comprehensive cost of the complete sets of equipment, take into account economy and practicality, have application prospect preferably; Overvoltage protection to protected equipment is more effective, and control system is simple and easy to realize.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment, the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (6)
1. lightning arrester over-pressure safety device that pressure ratio is variable, described lightning arrester comprises lightning arrester body, pressure-equalizing device and insulator foot; It is characterized in that: described device comprises lightning arrester series connection group, thyristor system and fault detection system; The lightning arrester that described thyristor system connects with described lightning arrester in group is in parallel, the group parallel connection of connecting with described lightning arrester of described fault detection system, and described lightning arrester is zinc oxide arrester.
2. the variable lightning arrester over-pressure safety device of pressure ratio according to claim 1 is characterized in that: described thyristor system comprises at least one anti-parallel thyristor and circuits for triggering thereof, and described circuits for triggering are in parallel with fault detection system.
3. the variable lightning arrester over-pressure safety device of pressure ratio according to claim 1; it is characterized in that: described lightning arrester series connection group is composed in series successively by two or more lightning arresters; a lightning arrester anti-parallel thyristor in parallel, described lightning arrester series connection group is in parallel with protected equipment.
4. the variable lightning arrester over-pressure safety device of pressure ratio according to claim 1; it is characterized in that: described fault detection system comprises overvoltage detection system and over-current detection system; the overvoltage detection system group of connecting with described protected equipment and described lightning arrester is all in parallel, and the over-current detection system lightning arrester of anti-parallel thyristor in parallel of connecting with described lightning arrester in group is not connected.
5. according to claim 2-4 variable lightning arrester over-pressure safety devices of arbitrary described pressure ratio, it is characterized in that: described anti-parallel thyristor is the inverse parallel gate level turn-off thyristor.
6. according to claim 1 or 4 variable lightning arrester over-pressure safety devices of arbitrary described pressure ratio, it is characterized in that: the voltage magnitude at the protected equipment of described fault detection system on-line monitoring two ends and the current amplitude of lightning arrester branch road, if voltage magnitude surpasses definite value V1 or current amplitude when surpassing definite value A1, described fault detection system judges that the overvoltage fault appears in protected equipment, described circuits for triggering send triggering signal to the anti-parallel thyristor gate pole, control the anti-parallel thyristor conducting, the temporary transient short circuit lightning arrester in parallel with anti-parallel thyristor; When the overvoltage fault of protected equipment is got rid of; fault detection system detects the not current amplitude of the lightning arrester of anti-parallel thyristor in parallel of flowing through; the current amplitude of the lightning arrester of anti-parallel thyristor in parallel not is lower than definite value A2 if flow through; described circuits for triggering stop sending triggering signal; during voltage zero-cross, anti-parallel thyristor disconnects, and the lightning arrester of short circuit puts into operation again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374886 CN202949205U (en) | 2012-07-13 | 2012-07-13 | Lightning arrester overvoltage protection device with variable voltage ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220374886 CN202949205U (en) | 2012-07-13 | 2012-07-13 | Lightning arrester overvoltage protection device with variable voltage ratio |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202949205U true CN202949205U (en) | 2013-05-22 |
Family
ID=48424885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220374886 Expired - Fee Related CN202949205U (en) | 2012-07-13 | 2012-07-13 | Lightning arrester overvoltage protection device with variable voltage ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202949205U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533203A (en) * | 2016-11-25 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | High-voltage large-power thyristor series connection assembly |
| CN111983339A (en) * | 2020-06-30 | 2020-11-24 | 中国电力科学研究院有限公司 | Method and system for determining volt-ampere characteristic of resistor disc of extra-high voltage metal oxide arrester |
| CN113014080A (en) * | 2019-12-20 | 2021-06-22 | 南京南瑞继保电气有限公司 | Converter overvoltage protection system of unified power flow controller and parameter design method |
-
2012
- 2012-07-13 CN CN 201220374886 patent/CN202949205U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106533203A (en) * | 2016-11-25 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | High-voltage large-power thyristor series connection assembly |
| CN106533203B (en) * | 2016-11-25 | 2023-06-16 | 云南电网有限责任公司电力科学研究院 | High-voltage high-power thyristor series assembly |
| CN113014080A (en) * | 2019-12-20 | 2021-06-22 | 南京南瑞继保电气有限公司 | Converter overvoltage protection system of unified power flow controller and parameter design method |
| CN111983339A (en) * | 2020-06-30 | 2020-11-24 | 中国电力科学研究院有限公司 | Method and system for determining volt-ampere characteristic of resistor disc of extra-high voltage metal oxide arrester |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104617571B (en) | A kind of electronic electric equipment over-voltage and over-current protector | |
| CN102035188B (en) | Novel thyristor overvoltage protection method | |
| CN202949205U (en) | Lightning arrester overvoltage protection device with variable voltage ratio | |
| CN103532123B (en) | A kind of protective circuit for dry-type air-core reactor switching overvoltage protection | |
| CN103124063B (en) | Arrester overvoltage protection device with variable voltage ratio and implementation method | |
| CN112769114A (en) | Method for selecting parameters of thyristor valve in controllable arrester | |
| CN111769518A (en) | Power station transformer neutral point protection method based on gap protection and lightning arrester | |
| CN201726124U (en) | Large current quick by-pass protection device | |
| CN204517400U (en) | The external interstitial structure zinc oxide arrester of low residual voltage | |
| CN201690231U (en) | Nonlinear neutral point ground resistor | |
| CN202197096U (en) | Short-circuit current limiter of electric power system | |
| CN207339261U (en) | A kind of overvoltage protection device for preventing high pressure from sealing in electrification display | |
| Barzegar et al. | Fusion TRV limiter a solution to modify interrupting characteristics of CBs with presence of resonance type SFCL | |
| CN210604861U (en) | Fusing type arrester group test device | |
| CN208690933U (en) | Protect circuit and pitch-controlled system | |
| CN104134979B (en) | Resonant superconducting short-circuit fault current limiter | |
| CN202978261U (en) | Double-channel surge protector | |
| CN204517398U (en) | Low residual voltage zinc oxide arrester | |
| CN203014373U (en) | Transient surge protector used specially for elevator | |
| CN201910623U (en) | Resistance-capacitance absorber | |
| CN205160044U (en) | Transformer neutral point DC dump appearance hinders device | |
| CN204517399U (en) | Low residual voltage interstitial structure zinc oxide arrester arranged side by side | |
| CN201388042Y (en) | Central high-voltage switch equal-height cabinet | |
| CN101527559A (en) | Controllable metal oxide lightning arrester, thyristor valve switch and over-current limit method thereof | |
| CN110361640A (en) | A kind of fusing type arrester group experimental rig |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20200713 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |