CN103124063A - Arrester overvoltage protection device with variable voltage ratio and implementation method - Google Patents
Arrester overvoltage protection device with variable voltage ratio and implementation method Download PDFInfo
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- CN103124063A CN103124063A CN2012102671567A CN201210267156A CN103124063A CN 103124063 A CN103124063 A CN 103124063A CN 2012102671567 A CN2012102671567 A CN 2012102671567A CN 201210267156 A CN201210267156 A CN 201210267156A CN 103124063 A CN103124063 A CN 103124063A
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Abstract
The invention provides an arrester overvoltage protection device with a variable voltage ratio and an implementation method, belonging to the technical field of power electronics. The device comprises an arrester serial connection group, a thyristor system and a fault detection system; the thyristor system is connected in parallel with an arrester in the arrester serial connection group; and the fault detection system is connected in parallel with the arrester serial connection group. The arrester overvoltage protection device with the variable voltage ratio has a relatively small number of used parts, a simple structure and a small floor area. In addition, as the power electronic devices used by the device are low in cost, the arrester overvoltage protection device with the variable voltage ratio lowers comprehensive manufacturing cost of a whole set of device, gives a consideration to economical efficiency and practical applicability, and has relatively good application foreground.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of pressure ratio variable lightning arrester over-pressure safety device and implementation method.
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.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art; the invention provides a kind of pressure ratio variable lightning arrester over-pressure safety device and implementation method; 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.
In order to realize the foregoing invention purpose, the present invention takes following technical scheme:
The lightning arrester over-pressure safety device that a kind of pressure ratio is variable, described device comprise 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.
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.
The lightning arrester overvoltage protection implementation method that a kind of pressure ratio is variable said method comprising the steps of:
Step 1: carry out On-line Fault Detection;
Step 2: logic judgement, if the voltage magnitude at protected equipment two ends less than the current amplitude of definite value V1 and lightning arrester branch road less than definite value A1, return to step 1 and continue to carry out; If the voltage magnitude at protected equipment two ends rises to the current amplitude of definite value V1 or lightning arrester branch road greater than definite value A1, execution in step 3;
Step 3: circuits for triggering send triggering signal to the anti-parallel thyristor gate pole, make the anti-parallel thyristor conducting, the lightning arrester that short circuit is in parallel with it;
Step 4: the electric current that carries out the lightning arrester branch road detects online;
Step 5: the logic judgement, be not less than A2 if flow through the current amplitude of lightning arrester not in parallel with anti-parallel thyristor, return to step 4 and continue to carry out; If flow through the current amplitude of lightning arrester not in parallel with anti-parallel thyristor less than A2, circuits for triggering stop sending triggering signal, and anti-parallel thyristor disconnects, and the lightning arrester of short circuit accesses lightning arrester series connection group again, returns to step 1.
Compared with prior art, beneficial effect of the present invention is:
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 overvoltage protection implementation method flow chart of pressure ratio in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As Fig. 1, the lightning arrester over-pressure safety device that a kind of pressure ratio is variable, described device comprise 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.
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.
As Fig. 2, the lightning arrester overvoltage protection implementation method that a kind of pressure ratio is variable said method comprising the steps of:
Step 1: carry out On-line Fault Detection;
Step 2: logic judgement, if the voltage magnitude at protected equipment two ends less than the current amplitude of definite value V1 and lightning arrester branch road less than definite value A1, return to step 1 and continue to carry out; If the voltage magnitude at protected equipment two ends rises to the current amplitude of definite value V1 or lightning arrester branch road greater than definite value A1, execution in step 3;
Step 3: circuits for triggering send triggering signal to the anti-parallel thyristor gate pole, make the anti-parallel thyristor conducting, the lightning arrester that short circuit is in parallel with it;
Step 4: the electric current that carries out the lightning arrester branch road detects online;
Step 5: the logic judgement, be not less than A2 if flow through the current amplitude of lightning arrester not in parallel with anti-parallel thyristor, return to step 4 and continue to carry out; If flow through the current amplitude of lightning arrester not in parallel with anti-parallel thyristor less than A2, circuits for triggering stop sending triggering signal, and anti-parallel thyristor disconnects, and the lightning arrester of short circuit accesses lightning arrester series connection group again, returns to step 1.
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 technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment, the present invention 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 the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (8)
1. lightning arrester over-pressure safety device that pressure ratio is variable, 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.
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 1,3 or 4 variable lightning arrester over-pressure safety devices of arbitrary described pressure ratio, it is characterized in that: described lightning arrester is metal oxide arrester.
7. 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.
8. lightning arrester overvoltage protection implementation method that pressure ratio is variable is characterized in that: said method comprising the steps of:
Step 1: carry out On-line Fault Detection;
Step 2: logic judgement, if the voltage magnitude at protected equipment two ends less than the current amplitude of definite value V1 and lightning arrester branch road less than definite value A1, return to step 1 and continue to carry out; If the voltage magnitude at protected equipment two ends rises to the current amplitude of definite value V1 or lightning arrester branch road greater than definite value A1, execution in step 3;
Step 3: circuits for triggering send triggering signal to the anti-parallel thyristor gate pole, make the anti-parallel thyristor conducting, the lightning arrester that short circuit is in parallel with it;
Step 4: the electric current that carries out the lightning arrester branch road detects online;
Step 5: the logic judgement, be not less than A2 if flow through the current amplitude of lightning arrester not in parallel with anti-parallel thyristor, return to step 4 and continue to carry out; If flow through the current amplitude of lightning arrester not in parallel with anti-parallel thyristor less than A2, circuits for triggering stop sending triggering signal, and anti-parallel thyristor disconnects, and the lightning arrester of short circuit accesses lightning arrester series connection group again, returns to step 1.
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Cited By (2)
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| CN103630729A (en) * | 2013-11-13 | 2014-03-12 | 国家电网公司 | One-step wiring device and method for testing 1000kV lightning arrester reference voltage and leakage current |
| CN110535115A (en) * | 2019-09-24 | 2019-12-03 | 全球能源互联网研究院 | A kind of direct current controllable arrester device |
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