CN101639507A - Controllable metal oxide arrester action characteristic testing device and method therefor - Google Patents
Controllable metal oxide arrester action characteristic testing device and method therefor Download PDFInfo
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- CN101639507A CN101639507A CN200910088782A CN200910088782A CN101639507A CN 101639507 A CN101639507 A CN 101639507A CN 200910088782 A CN200910088782 A CN 200910088782A CN 200910088782 A CN200910088782 A CN 200910088782A CN 101639507 A CN101639507 A CN 101639507A
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Abstract
The invention discloses a controllable metal oxide arrester action characteristic testing device and a method therefor. The method comprises: the sphere gap spacing in an impulse voltage generator isregulated, impulse voltage with the peak value higher than the action threshold value of a controllable metal oxide arrester sample is applied on the controllable metal oxide arrester sample for a plurality of times, and the voltage value of the controllable metal oxide arrester sample at the action moment can be obtained by recording the voltage value of the sample at the action moment. The action characteristic testing method of the controllable arrester has good system equivalence under the conditions of power frequency, operation and lightning impulse voltage, so as to comprehensively testthe action characteristics of the controllable arrester in an actual system under various voltages.
Description
Technical field
The present invention relates to the controllable metal oxide arrester technology, relate in particular to a kind of controllable metal oxide arrester acting characteristic test unit and method.
Background technology
According to the ultra-high voltage AC transmission system degree of depth is reduced the demand of switching overvoltage level and the conventional restriction of switching overvoltage in the deficiency that exists aspect economy and the operational reliability, proposed the notion of controllable metal oxide arrester.Hereinafter, controllable metal oxide arrester is abbreviated as controlled lightning arrester.The structure of controlled lightning arrester as shown in Figure 1, MOA1, MOA2 are respectively controlled member and retaining element; K is a switch, can adopt thyristor or gap.The principle of work of controlled lightning arrester is: control the lightning arrester resistor disc flexibly by K and insert quantity to change the lightning arrester volt-ampere characteristic.When system normally moves, K disconnects, the common pressure limiting of MOA1 and MOA2, by (for example improving its rated voltage, conventional lightning arrester rated voltage is 828kV, controlled lightning arrester rated voltage is chosen as 890kV) to reduce lightning arrester operation chargeability (for example, controlled lightning arrester operation chargeability is reduced to 71% from 77% of conventional lightning arrester).Under the transient state situation, the K conducting, MOA1 is by short circuit, and the MOA2 residual voltage is low, reduces the system operation superpotential with the degree of depth.
But the description of principle of work under operating voltage, power-frequency overvoltage, switching overvoltage and lightning surge only limits to theoretical analysis to controlled lightning arrester and thyristor switch K thereof in the prior art, its correctness experimental examination of still needing.At present, the standard that power-frequency voltage resistance test, operating impulse voltage test and lightning impulse voltage test at conventional lightning arrester are only arranged both at home and abroad, and above-mentioned standard all is for checking the insulating property of conventional lightning arrester, can not directly be used for checking the acting characteristic under the various voltage stresss of controlled lightning arrester.At present, for this novel device of controlled lightning arrester, there is no ready-made test method and test standard can follow, and therefore, need formulate new test method and test standard at the characteristics of controlled lightning arrester.
Summary of the invention
In view of this, the present invention's technical matters that will solve provides a kind of controlled lightning arrester acting characteristic test unit.
The invention provides a kind of controlled lightning arrester acting characteristic test unit, comprising: impulse voltage generator, impulse voltage generator have high-voltage output end and low-voltage output, and controlled lightning arrester test product is connected between this high-voltage output end and the low-voltage output; Voltage divider, an end links to each other with the high-voltage output end of impulse voltage generator, an end ground connection; The waveform recording device is connected the output terminal of voltage divider.Wherein, impulse voltage generator comprises: the zero level branch road comprises: wave front resistance and wave rear resistance, this wave front resistance and wave rear resistance string are associated between the high-voltage output end and low-voltage output of impulse voltage generator; The batching sphere crack, an end in batching sphere crack is connected to the tie point of wave front resistance and wave rear resistance; The one-level branch road has one-level high-voltage output end and one-level low-voltage output, comprising: the one-level main capacitor is connected between described one-level high-voltage output end and the one-level low-voltage output; The ignition pill crack is connected between one-level high-voltage output end and the ground; Charging resistor is connected between one-level low-voltage output and the ground; Protective resistance, high voltage silicon rectifier stack and testing transformer, the secondary coil of described protective resistance, high voltage silicon rectifier stack and testing transformer are connected in series between one-level high-voltage output end and the ground successively; Pressure regulator, the parallel connection of primary windings of pressure regulator and testing transformer is connected.The other end in batching sphere crack is connected described one-level low-voltage output.
An embodiment according to controlled lightning arrester acting characteristic test unit of the present invention also comprises at least one secondary branch road.This secondary branch road has secondary high pressure output terminal and secondary low-voltage output terminal, comprising: secondary main capacitor is connected between secondary high pressure output terminal and the secondary low-voltage output terminal; Secondary ball crack and damping resistance are connected in series between secondary high pressure output terminal and the upper level low-voltage output; Two charging resistors, be connected to secondary and the upper level high-voltage output end between and between secondary and the upper level low-voltage output.
An embodiment according to controlled lightning arrester acting characteristic test unit of the present invention also comprises the ball stand-off distance from control device, is used for adjusting the distance in branch road balls at different levels crack.
Another technical matters that the present invention will solve provides a kind of controlled lightning arrester acting characteristic test method.
The invention provides a kind of controlled lightning arrester acting characteristic test method, comprise: set in the described impulse voltage generator ball stand-off distance from, controlled lightning arrester test product is applied the surge voltage that peak value is higher than described controlled lightning arrester test product action threshold value, write down described controlled lightning arrester test product action magnitude of voltage constantly; Progressively increase in the described impulse voltage generator ball stand-off distance from, controlled lightning arrester test product is applied the surge voltage that peak value is higher than described controlled lightning arrester test product action threshold value, write down described controlled lightning arrester test product action magnitude of voltage constantly; With the mean value of the above-mentioned described controlled lightning arrester test product action magnitude of voltage constantly that repeatedly measure to obtain as described controlled lightning arrester test product action magnitude of voltage constantly.
Further, this method also comprises: at first set in the impulse voltage generator ball stand-off distance from, controlled lightning arrester test product is applied the surge voltage that peak value is lower than described controlled lightning arrester test product action threshold value slightly, if described controlled lightning arrester test product action magnitude of voltage is constantly write down in described controllable metal oxide arrester test product action.
Further, this method also comprises: the described controlled lightning arrester test product action magnitude of voltage constantly to record carries out temperature and/or humidity correction.
Controlled lightning arrester acting characteristic test unit of the present invention and method have realized the test of the acting characteristic of controlled lightning arrester under power frequency, operation and lightning impulse voltage, have the good system equivalence, can check controlled lightning arrester acting characteristic under the various voltages in real system.
Description of drawings
Fig. 1 illustrates the structural drawing of controlled lightning arrester;
Fig. 2 illustrates the volt-ampere characteristic of drawing according to controlled lightning arrester principle of work;
Fig. 3 illustrates controlled lightning arrester acting characteristic test schematic under the power-frequency voltage;
Fig. 4 illustrates according to controlled lightning arrester acting characteristic test schematic under the surge voltage of the present invention;
Fig. 5 illustrates the process flow diagram according to an embodiment of controllable metal oxide arrester acting characteristic test method of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
Fig. 2 illustrates the volt-ampere characteristic of drawing according to controlled lightning arrester principle of work.In Fig. 2, curve 2 is the volt-ampere characteristic of controlled lightning arrester, and as a comparison, curve 1 is the volt-ampere characteristic of conventional lightning arrester; Wherein, conventional lightning arrester rated voltage is 828kV, and controlled lightning arrester rated voltage is chosen as 890kV.
Under operating voltage or the power-frequency overvoltage: K disconnects, and voltage is born in MOA1 and MOA2 series connection jointly, and controlled lightning arrester works in the regional A among Fig. 2.Controlled lightning arrester operation chargeability is reduced to 71% from 77% of conventional lightning arrester, to improve lightning arrester long-time running reliability.
Under the switching overvoltage: in system for ultra-high voltage transmission, switching overvoltage wave head time T
fLonger, be generally 600～4500 μ s, the T more than 90%
f＞1000 μ s.The service time T of thyristor switch K
GtBe generally 1 to a few μ s, much smaller than the wave head time of switching overvoltage, the response time of K can be satisfied the requirement of restriction switching overvoltage fully.When switching overvoltage value that controlled lightning arrester bore surpasses its activation threshold value, the K conducting, MOA1 is by short circuit, and controlled lightning arrester works in the area B of curve 2 among Fig. 2, and the MOA2 residual voltage is lower, switching overvoltage can be restricted to reduced levels.
Thunder and lightning is invaded under the ripple superpotential: statistics shows, about 85% lightning current wave head length degree in 1～5 μ s, average out to 2.6 μ s.The thunder and lightning that this lightning current produced is invaded the superpotential wave head time T of ripple
hGenerally in 1～4 μ s.When the superpotential amplitude of thunder and lightning intrusion ripple rose to the action threshold value of controlled lightning arrester, thyristor switch just began response, passes through T then
GtService time after, really enter conducting state.If it is T that thunder and lightning intrusion ripple superpotential amplitude rises to the controlled lightning arrester action required time of threshold value, the service time T of thyristor switch
Gt, thyristor switch is actual to be entered the required time of conducting state and is (T+T
Gt), both sums are often invaded the superpotential wave head time T of ripple greater than thunder and lightning
h, the response speed of thyristor switch can't satisfy the restriction thunder and lightning and invade the superpotential requirement of ripple.At this moment, MOA1 and the MOA2 common pressure limiting of connecting, controlled lightning arrester works in the zone C of curve 2 among Fig. 2.Because the more conventional lightning arrester height of lightning arrester rated voltage, residual voltage of arrester increases, the thunder and lightning of same amplitude is invaded under the ripple superpotential, lightning surge on the equipment can raise, can make it less than the lightning impulse tolerance level by the installation quantity of optimization lightning arrester and the lightning surge on the position limit electrical equipment.
At first introduce the test of controlled lightning arrester acting characteristic under power-frequency voltage below.
Fig. 3 illustrates controlled lightning arrester acting characteristic test schematic under the power-frequency voltage.As shown in Figure 3, this hookup comprises industrial frequency experiment voltage source 10, switch 11, testing transformer 12, test product 13, voltage divider 14 and wave tracer 15.Between voltage source 10 and switch 11, also be in series with anti-(abbreviation internal resistance) Zs of power supply equivalent internal resistance.Annexation between each assembly as shown in Figure 3, voltage source 10, resistance Zs and switch 11 are connected on the two ends of the primary coil of transformer 12, test product 13 is connected in parallel on the two ends of the secondary coil of transformer 12, one end of voltage divider 14 links to each other with the high-voltage output end of transformer 12, other end ground connection, wave tracer 15 is connected the output terminal of voltage divider 14.
Controlled lightning arrester will bear the effect of power-frequency voltage (operating voltage and power-frequency overvoltage) in operational process, the action accuracy of controlled lightning arrester under power-frequency voltage is directly connected to the energy absorption and tolerance performance of retaining element MOA2, therefore need be to the action accuracy research experiment of controlled lightning arrester under the power-frequency voltage.
This test is mainly used in the acting characteristic of the controlled lightning arrester of test under the power-frequency voltage that surpasses its action threshold value U0.High voltage industrial frequency experiment voltage source and adjusting and test branch road are adopted in test, and hookup as shown in Figure 3.The trial voltage value that requires the industrial frequency experiment voltage source is much larger than U0, and frequency and is similar to sine wave between 48Hz and 62Hz; Measuring equipments such as voltage divider should satisfy the requirement of GB/T 16927.2.
At first, the controlled part of test product is installed in low-pressure side or high-pressure side, and test product is placed on the metal support with the real system equal height, carry out wiring by hookup Fig. 3 according to the mounting means in the real system of controlled lightning arrester.Slowly pressurize for test product,, rapidly voltage is reduced to 0 then until controlled lightning arrester action, the voltage U when measuring controlled lightning arrester action, and write down corresponding waveform; Repeat above-mentioned steps, the measurement result of each U is all carried out temperature and humidity proofread and correct, the mean value of asking many measurement results of U at last is the operation voltage under power-frequency voltage as controlled lightning arrester and thyristor switch thereof.
Fig. 4 illustrates according to controlled lightning arrester acting characteristic test schematic under the surge voltage of the present invention.As shown in Figure 4, controlled lightning arrester acting characteristic test unit comprises impulse voltage generator 21, voltage divider 24 and waveform recording device 25.Wherein, impulse voltage generator 21 has high-voltage output end 1 and low-voltage output 2, and controlled lightning arrester test product 23 is connected in parallel between high-voltage output end 1 and the low-voltage output 2; Voltage divider 24 1 ends link to each other other end ground connection with the high-voltage output end 1 of impulse voltage generator 21; Waveform recording device 25 is connected the output terminal of voltage divider 24.
As shown in Figure 4, testing transformer T and high voltage silicon rectifier stack D constitute rectifier power source, charge to main capacitor C1～Cn through protective resistance r and charging resistor R; be charged to U; the potential difference (PD) that appears on the g1～gn of ball crack also is U, is a bit larger tham U if in advance the sphere gap distance is transferred to, and sphere gap can not discharge.When needs produce surge voltage, can send to a pulse voltage to the stylus of ignition pill crack g1, produce a sparklet between stylus and the covering, cause the igniting ball-gap discharge, so the top crown of capacitor C1 through g1 ground connection, the current potential of point (2-1) is become-U by earth potential.There is charging resistor R to separate between capacitor C1 and the next stage capacitor C2, R is bigger, discharge moment at g1, the impossible flip-flop of point (1-2) and point (2-2) current potential, point (1-2) current potential still is+U, potential difference (PD) on the g2 of ball crack rises to 2U suddenly, and g2 discharges at once, so point (1-2) current potential becomes suddenly-2U.In like manner, g3, g4......gn be and then discharge also, and capacitor C1～Cn just has been together in series.At last, batching sphere crack g0 also discharges, and at this moment, output voltage is the voltage summation on C1～Cn, for-nU.Above-mentioned a series of process can be summarized as " capacitor charged in parallel, then discharged in series ", becomes series connection by parallel connection and reaches by one group of ball crack.R plays the connection effect of circuit when charging, play buffer action when discharge again.Rd prevents the inner vibration usefulness that takes place in loop.Protective resistance r generally than the big order of magnitude of R, not only protects silicon stack, also can make the charging voltage of capacitors at different levels more even.The speed of the surge voltage waveform rising part that this impulse voltage generator produced is relevant with Rf, and Rf is called wave front resistance; The speed of surge voltage waveform sloping portion is relevant with Rt, and Rt is called wave rear resistance.Rf is little, and it is fast to rise; Rt is big, and it is slow to descend.
An embodiment according to controllable metal oxide arrester acting characteristic test unit of the present invention also comprises the ball stand-off distance from control device, is used for adjusting the distance in branch road balls at different levels crack.
Those skilled in the art will appreciate that the needs according to different tests, above-mentioned controlled lightning arrester acting characteristic test schematic can comprise one or more secondary branch roads 212, and each secondary branch road comprises identical assembly.When comprising a plurality of secondary branch road 212, the annexation of secondary branch road and one-level branch road is similar among annexation between each secondary branch road and Fig. 4, first secondary branch road is as shown in Figure 4 to link to each other with the one-level branch road, and last secondary branch road is as shown in Figure 4 to link to each other with the zero level branch road.From top description as can be seen, secondary branch road has the effect that voltage difference is added up.Equally, according to the needs of different tests, above-mentioned controlled lightning arrester acting characteristic test schematic also can not comprise secondary branch road 212, and at this moment, the other end in the zero level ball crack in first output terminal of one-level branch road and the zero level branch road directly is connected.
Fig. 5 illustrates the process flow diagram according to an embodiment of controllable metal oxide arrester acting characteristic test method of the present invention.
As shown in Figure 5, in step 502, set in the described impulse voltage generator ball stand-off distance from, the controllable metal oxide arrester test product is applied the surge voltage that peak value is higher than described controllable metal oxide arrester test product action threshold value, write down described controllable metal oxide arrester test product action magnitude of voltage constantly;
In step 504, progressively increase in the described impulse voltage generator ball stand-off distance from, the controllable metal oxide arrester test product is applied the surge voltage that peak value is higher than described controllable metal oxide arrester test product action threshold value, write down described controllable metal oxide arrester test product action magnitude of voltage constantly;
In step 506, with the mean value of the above-mentioned described controllable metal oxide arrester test product action magnitude of voltage constantly that repeatedly measure to obtain as described controllable metal oxide arrester test product action magnitude of voltage constantly.
An embodiment according to acting characteristic test method of the present invention, before step 502, can at first set in the impulse voltage generator ball stand-off distance from, the controllable metal oxide arrester test product is applied the surge voltage that peak value is lower than described controllable metal oxide arrester test product action threshold value slightly, if described controllable metal oxide arrester test product action magnitude of voltage is constantly write down in described controllable metal oxide arrester test product action; Wherein above-mentioned being lower than slightly for example is than action threshold value low 1%～10%.
Below in conjunction with circuit among Fig. 4 and acting characteristic test method of the present invention, specifically describe test for operating impulse voltage and lightning impulse voltage.
At first introduce the test method of controlled lightning arrester acting characteristic under 250/2500 μ s reference waveform operating impulse voltage.
A fundamental purpose of controlled lightning arrester is the restriction operating impulse voltage, so the action accuracy of thyristor switch under operating impulse voltage is directly connected to the restriction effect of controlled lightning arrester to operating impulse voltage, therefore need study the action accuracy of thyristor switch under the operating impulse voltage.
This test be mainly used in the controlled lightning arrester of test under the operating impulse voltage that surpasses its action threshold value acting characteristic and installation site, the test product of controlled part (MOA1 and K etc.) place height, and the operating impulse voltage wave head time to the influence of controlled lightning arrester acting characteristic.High voltage operation impulse voltage generator and adjusting and test loop are adopted in test, and hookup as shown in Figure 4.The trial voltage peak value that requires the operating impulse voltage source is much larger than U0; Measuring equipments such as voltage divider should satisfy the requirement of GB/T 16927.2.
The test procedure of the inventive method comprises:
(11) according to the mounting means in the real system of controlled lightning arrester the controlled part of test product is installed in low-pressure side or high-pressure side, and test product is placed on the metal support with the real system equal height, carry out wiring by hookup Fig. 4.
(12) the ball stand-off distance of adjusting operation impulse voltage generator from, apply the operating impulse voltage of peak value to test product, observe the waveform of U, see that whether controlled lightning arrester moves a little less than controlled lightning arrester action threshold value, as action, the waveform of record U and controlled lightning arrester action magnitude of voltage constantly.
(13) the ball stand-off distance that suitably increases operation impulse voltage generator from, apply the operating impulse voltage that peak value is higher than controlled lightning arrester action threshold value to test product, observe the waveform of U and the action situation of controlled lightning arrester, the waveform of record U and controlled lightning arrester and thyristor switch action magnitude of voltage constantly thereof.
Repeating step (13) repeatedly, all suitably increase at every turn the ball stand-off distance from, go forward side by side trip temperature and humidity of the measurement result of record U is proofreaied and correct, and the mean value of asking many measurement results of U at last is the operation voltage under operating impulse voltage as controlled lightning arrester and thyristor switch thereof.
Secondly, introduce the test method of controlled lightning arrester acting characteristic under 1.2/50 μ s reference waveform lightning impulse voltage.
In theory, because the wave head time of lightning impulse voltage is generally less than opening time delay of thyristor switch, the wave head that the thyristor switch of controlled lightning arrester may have little time under the lightning impulse superpotential is open-minded in the time, generally can be open-minded in its wave rear, so controlled lightning arrester should limit the lightning impulse superpotential of shortwave head.Be the correctness that proof theory is analyzed, the present invention studies the acting characteristic of controlled lightning arrester under the lightning impulse superpotential.
This test is mainly used in acting characteristic and installation site, the test product of controlled part (MOA1 and K etc.) of the controlled lightning arrester of test under the lightning impulse voltage that surpasses its action threshold value and places highly influence to controlled lightning arrester acting characteristic.High voltage lightning impulse voltage generator and adjusting and test loop are adopted in test, and hookup as shown in Figure 4.The trial voltage peak value that requires the lightning impulse voltage source is much larger than U0; Measuring equipments such as voltage divider should satisfy the requirement of GB/T 16927.2.
The test procedure of the inventive method comprises:
(21) according to the mounting means in the real system of controlled lightning arrester the controlled part of test product is installed in low-pressure side or high-pressure side, and test product is placed on the metal support of the height identical, carry out wiring by hookup Fig. 4 with real system.
(22) the ball stand-off distance of adjusting the lightning impulse voltage generator from, apply the lightning impulse voltage of peak value to test product a little less than controlled lightning arrester action threshold value, observe the waveform of U, the waveform of record U and controlled lightning arrester action magnitude of voltage constantly.
(23) the ball stand-off distance that suitably increases operation impulse voltage generator from, apply the operating impulse voltage that peak value is higher than controlled lightning arrester action threshold value to test product, observe the waveform of U and the action situation of controlled lightning arrester, the waveform of record U and controlled lightning arrester action magnitude of voltage constantly.
Repeating step (23) repeatedly all suitably increases the ball stand-off distance at every turn and proofreaies and correct from go forward side by side trip temperature and humidity of, the measurement result of record U, sums up the Changing Pattern of controlled lightning arrester action magnitude of voltage constantly with the lightning impulse voltage peak value at last.
Controlled lightning arrester acting characteristic test unit of the present invention and method can realize it being the experimental study of the acting characteristic of controlled lightning arrester under power frequency, operation and lightning impulse voltage, the correctness that check is described controlled lightning arrester principle of work under different voltage stresss is for the formulation of controlled lightning arrester control strategy provides test basis.Controlled lightning arrester of the present invention acting characteristic Study on testing method under power frequency, operation and lightning voltage has broken through the restriction of conventional lightning arrester test standard, for performance how to check controlled this novel device of lightning arrester with how to formulate new test method and test standard has been carried out useful exploration.Controlled lightning arrester of the present invention acting characteristic test method under power frequency, operation and lightning voltage has the good system equivalence, can completely examine controlled lightning arrester acting characteristic under the various voltages in real system.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.
Claims (7)
1. a controllable metal oxide arrester acting characteristic test unit is characterized in that, comprising:
Impulse voltage generator, described impulse voltage generator has high-voltage output end and low-voltage output, and described controllable metal oxide arrester test product is connected between described high-voltage output end and the low-voltage output;
Voltage divider, described voltage divider one end links to each other with the high-voltage output end of described impulse voltage generator, an end ground connection;
The waveform recording device is connected the output terminal of described voltage divider;
Wherein, described impulse voltage generator comprises:
The zero level branch road comprises: wave front resistance and wave rear resistance, and described wave front resistance and wave rear resistance string are associated between described high-voltage output end and the low-voltage output; The batching sphere crack, an end in described batching sphere crack is connected to the tie point of described wave front resistance and wave rear resistance;
The one-level branch road has one-level high-voltage output end and one-level low-voltage output, comprising: one-level main capacitor, described one-level main capacitor are connected between described one-level high-voltage output end and the one-level low-voltage output; Ignition pill crack, described ignition pill crack are connected between described one-level high-voltage output end and the ground; Charging resistor, described charging resistor are connected between described one-level low-voltage output and the ground; Protective resistance, high voltage silicon rectifier stack and testing transformer, the secondary coil of described protective resistance, high voltage silicon rectifier stack and testing transformer are connected in series between one-level high-voltage output end and the ground successively; Pressure regulator, the parallel connection of primary windings of described pressure regulator and described testing transformer is connected;
The other end in described batching sphere crack is connected described one-level low-voltage output.
2. controllable metal oxide arrester acting characteristic test unit according to claim 1 is characterized in that, also comprises at least one secondary branch road;
Described secondary branch road has secondary high pressure output terminal and secondary low-voltage output terminal, comprising: secondary main capacitor is connected between secondary high pressure output terminal and the secondary low-voltage output terminal; Secondary ball crack and damping resistance are connected in series between secondary high pressure output terminal and the upper level low-voltage output; Two charging resistors, be connected to secondary and the upper level high-voltage output end between and between secondary and the upper level low-voltage output.
3. controllable metal oxide arrester acting characteristic test unit according to claim 1 and 2 is characterized in that, also comprises the ball stand-off distance from control device, is used for adjusting the distance in branch road balls at different levels crack.
4. controllable metal oxide arrester acting characteristic test unit according to claim 1 and 2 is characterized in that, described wave front resistance is used for the speed of regulation voltage waveform rising part; Described wave rear resistance is used for the speed of regulation voltage waveform sloping portion.
5. a controllable metal oxide arrester acting characteristic test method is characterized in that, comprising:
Set in the described impulse voltage generator ball stand-off distance from, the controllable metal oxide arrester test product is applied the surge voltage that peak value is higher than described controllable metal oxide arrester test product action threshold value, write down described controllable metal oxide arrester test product action magnitude of voltage constantly;
Progressively increase in the described impulse voltage generator ball stand-off distance from, the controllable metal oxide arrester test product is applied the surge voltage that peak value is higher than described controllable metal oxide arrester test product action threshold value, write down described controllable metal oxide arrester test product action magnitude of voltage constantly;
With the mean value of the above-mentioned described controllable metal oxide arrester test product action magnitude of voltage constantly that repeatedly measure to obtain as described controllable metal oxide arrester test product action magnitude of voltage constantly.
6. controllable metal oxide arrester acting characteristic test method according to claim 5 is characterized in that, also comprises:
At first set in the impulse voltage generator ball stand-off distance from, the controllable metal oxide arrester test product is applied the surge voltage that peak value is lower than described controllable metal oxide arrester test product action threshold value slightly, if described controllable metal oxide arrester test product action magnitude of voltage is constantly write down in described controllable metal oxide arrester test product action.
7. according to claim 5 or 6 described controllable metal oxide arrester acting characteristic test methods, it is characterized in that, also comprise:
Described controllable metal oxide arrester test product action magnitude of voltage constantly to record carries out temperature and/or humidity correction.
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