CN103823101A - Method for measuring impact current division coefficient of power transmission line tower with lightning conductor - Google Patents
Method for measuring impact current division coefficient of power transmission line tower with lightning conductor Download PDFInfo
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Abstract
The invention provides a method for measuring an impact current division coefficient of a power transmission line tower with a lightning conductor. The method comprises the steps of firstly, collecting tower parameters, including the diagonal length of a tower grounding device and the form of the tower, secondly, driving an auxiliary grounding electrode in ground near the tower in such a manner that the distance between the auxiliary grounding electrode and the tower is more than two times the diagonal length of the tower grounding device, connecting a high-voltage end of impact power output with a current divider in series through a high-voltage conductor and then connecting to the joint of the tower and the lightning conductor, and connecting a low-voltage end of impact power output with the auxiliary grounding electrode, wherein the resistor R of the current divider is a high-precision non-inductive resistor of 0.01 ohm. The method is capable of measuring the impact current division coefficient of the power transmission line tower with the lightning conductor, avoiding errors caused by theoretical assumption and improving the accuracy of lightning protection counterattack calculation of the power transmission line.
Description
Technical field
The present invention relates to the measuring method that a kind of electric power line pole tower with lightning conducter impacts diverting coefficient, the method is applicable to lightning Protection Design and the Lightning Transformation of transmission line of electricity, belongs to Hyper-Voltage of Power Systems field.
Background technology
The lightning stroke trip of transmission line of electricity has had a strong impact on the safe operation of China's electrical network.When the electric power line pole tower lightning withstand level of calculating with lightning conducter, need shaft tower place coefficient of lightning distribution, needing to know has how many lightning currents to flow away from lightning conducter, have how many lightning currents to flow into the earth along shaft tower and tower grounding device, the lightning current of inflow the earth and total lightning current ratio are defined as the diverting coefficient of electric power line pole tower lightning current.The impact diverting coefficient of current power transmission overhead line structures, except obtaining according to hypothesis theory, is mainly built model of power transmission system by simulation software, obtains by simulation calculation.Because simple soil texture can only be simulated by simulation software, as soil of the soil of uniform soil, vertical direction Multi-layers distributing, horizontal direction Multi-layers distributing etc., actual soil texture complexity many, and measure very difficult, therefore cause soil model and the actual soil texture set up to differ greatly, result of calculation and the actual conditions of impacting diverting coefficient are not inconsistent.The present invention relates to the measuring method that the electric power line pole tower of a kind of measurement with lightning conducter impacts diverting coefficient, comprising impulse current generator, high-precision rogowski coil, shunt and dual channel oscilloscope, utilize method provided by the invention to measure respectively the waveform of impulse current generator and the tower grounding utmost point, and the electric power line pole tower calculating with lightning conducter by formula provided by the invention impact diverting coefficient.The present invention measures according to the principle of diverting coefficient, in the method proposing, do not relate to soil resistivity, computation process is also irrelevant with soil texture, therefore the measuring method that the present invention proposes can realize the measurement of electric power line pole tower with lightning conducter being impacted to diverting coefficient, avoids the inhomogeneous and error that causes of soil resistivity simultaneously.
Summary of the invention
The method that the object of the present invention is to provide the electric power line pole tower of a kind of measurement with lightning conducter to impact diverting coefficient, is used the method can realize the measurement of the electric power line pole tower with lightning conducter being impacted to diverting coefficient, and the error of avoiding theory hypothesis to bring.
The know-why that the present invention realizes above-mentioned purpose is to utilize the definition of the electric power line pole tower impact diverting coefficient with lightning conducter, builds metering circuit and measures.Its schematic diagram and wiring diagram are if accompanying drawing 1 is with as shown in Fig. 2: S is for measuring with impacting power supply; P is shunt; L is Luo-coil; C is oscillograph.R is the impact impedance of electric power line pole tower and tower grounding device; Z is the equiva lent impedance of lightning conducter; R
1for the equivalent impedance ground of the adjacent shaft tower that is connected with lightning conducter, this impedance ground is formed by other tower grounding device impedance grounds that are connected with lightning conducter and the equivalence of System in Substation impedance ground;
As shown in Figure 1, in the time applying dash current in electric power line pole tower measured point, this point that is equivalent to be struck by lightning, now a dash current part is by lightning conducter equiva lent impedance Z and lightning conducter equivalence stake resistance R
1transmit, the impedance R of another part by shaft tower and the tower grounding utmost point flows into the earth, and the amplitude of establishing the current waveform of the impedance R inflow the earth by shaft tower and the tower grounding utmost point is I
1, the output current wave amplitude of measuring power supply is I, the ratio I of the two
1/ I is surveyed impact diverting coefficient k.Change the position of measured point, the diverting coefficient can obtain being struck by lightning shaft tower diverse location time.Because impulse current waveform cannot directly be measured, the present invention becomes current conversion after voltage with Luo-coil by shunt, measures by oscillograph, and concrete grammar is:
Utilizing resistance is that the current waveform of measuring power supply output is converted to voltage waveform by the shunt that the high precision noninductive resistance of 0.01 ohm is made, and its variation relation according to Ohm law is:
U
1=I×R
0
Wherein U
1for the voltage magnitude that oscillograph records, I is the output current wave amplitude of measuring power supply, R
0for the resistance of shunt, therefore:
U
1=0.01I
Adopt the soft band Luo-coil of multiple high precision to measure by the earth current of shaft tower, each coil surrounds down conductor or the shaft tower pin of a shaft tower, can measure by the electric current of the down conductor of this shaft tower or the inflow the earth of shaft tower pin, by all Luo-coil output terminals being pressed to the direction series connection that Same Name of Ends is identical, can measure total electric current that passes through this shaft tower inflow the earth, in the time that the no-load voltage ratio of Luo-coil is 100A/1V, flow into the amplitude I of terrestrial current waveform
1with Luo-coil output voltage U
2between pass be:
U
2=（1/100）I
1=0.01I
1
According to above-mentioned relation, now impact diverting coefficient and be:
k=I
1/I=U
2/U
1
Therefore can measure the impact diverting coefficient k of electric power line pole tower by method provided by the invention.
The technical solution adopted for the present invention to solve the technical problems comprises the following steps:
The first step, collects shaft tower parameter, comprises tower grounding device catercorner length, pole tower forms;
Second step is laid the auxiliary earth utmost point near shaft tower, and the auxiliary earth utmost point should be at the more than 2 times of tower grounding system catercorner length to the distance of shaft tower; The measured point that is connected to shaft tower after the high-pressure side that impacts power supply output is connected with shunt by high-voltage conducting wires, the low pressure end that impacts power supply output is extremely connected with auxiliary earth, and shunt is the high precision noninductive resistance of 0.01 ohm.
The 3rd step, regulates and impacts the output waveform of power supply, until wave head time, wave rear time meet relevant criterion and measures requirement;
High precision that the 4th step is 100A/1V by no-load voltage ratio is soft has shaft tower column foot or the down conductor of electrical connection to surround with Luo-coil and earth mat, and Luo-coil requires responsive bandwidth more than 200kHz, and input and output phase delay time is less than 0.1 microsecond;
The 5th step, presses by all Luo-coil output terminals the direction series connection that Same Name of Ends is identical, i.e. when two Luo-coil series connection, and the different name end of another coil output of the termination of the same name of a coil output, measuring junction is the total output after all Luo-coil series connection.According to the superposition principle in circuit, now the voltage waveform of total output is the stack result in the same way of each Luo-coil output voltage waveforms, because the electric current that flows into the earth is the algebraic sum that each shaft tower pin being connected with earth mat or pillar flow into respectively earth mat electric current, and the no-load voltage ratio of each Luo-coil is identical, therefore the total output voltage waveforms recording is identical with the waveform of the total current of inflow earth mat, and amplitude meets no-load voltage ratio relation.Adopt the method can guarantee to measure primary power source output and just can record the total current that flows into the earth, thereby avoid the error superposition of repeatedly measuring.As shown in Figure 2, in figure, two pillars have down conductor, suppose to be respectively I by the electric current of these two downleads respectively
11and I
12, have
I
1=I
11+I
12
Now the output voltage of single Luo-coil is respectively
U
21=（1/100）I
11，U
22=（1/100）I
12
Total output voltage after Luo-coil series connection is
U
2=U
21+U
22=（1/100）I
1
The 6th step, respectively the Luo-coil output terminal after shunt and series connection is received to oscillographic two input channels, start and impact power supply output test lightning current, record respectively the output voltage waveforms of shunt and Luo-coil group, the voltage waveform amplitude that records shunt output is U
1, the output voltage waveforms U of Luo-coil group
2, the diverting coefficient that calculates this measuring point place of electric power line pole tower by following formula is k.
In above-mentioned steps, second step, when the resistance of shunt is R, the unit of R is ohm, in the time that R is not equal to 0.01 ohm, the result U now recording
1=RI, U2=0.01I
1, due to k=I
1/ I, the expression formula that therefore can obtain the diverting coefficient k at this measuring point place of electric power line pole tower according to these three equatioies is:
In above-mentioned steps, the 4th step, in the time that Luo-coil no-load voltage ratio is not 100A/1V, establishing its no-load voltage ratio is xA/yV, x and y are any arithmetic number, the result U now recording
1=0.01I, U2=yI
1/ x, due to k=I
1/ I, the expression formula that therefore can obtain the diverting coefficient k at this measuring point place of electric power line pole tower according to these three equatioies is:
In above-mentioned steps, the Luo-coil that measurement dash current is used can replace with other current measuring devices, can be according to the no-load voltage ratio of other current measuring devices in the computing formula of its diverting coefficient k, and deriving to be out of shape according to claim 3 obtains.
In above-mentioned steps, second step, output waveform changes the impulse current waveform of other types into, can obtain electric power line pole tower under the different dash currents diverting coefficient at this measuring point place.
Impact the output current of power supply and not only can measure with shunt, also can measure with other current measuring devices.
Measuring method provided by the invention is not considered the situation of tower grounding utmost point flashing electric discharge, as considered spark discharge, can consider to increase the output voltage of measuring power supply, so that can cause the electric discharge of earthing pole flashing, the diverting coefficient k now recording is the result of having considered spark discharge, or flow into the electric current of the earth and do not flow into the funtcional relationship between terrestrial current by shaft tower when flashing electric discharge by shaft tower while obtaining spark discharge by experiment, this funtcional relationship is introduced to calculating formula provided by the invention.
The present invention not only can be for shaft tower type shown in the drawings, is also applicable to other all electric power line pole towers that are equiped with lightning conducter.
The invention has the beneficial effects as follows: the measuring method that the present invention proposes can realize the measurement of the electric power line pole tower with lightning conducter being impacted to diverting coefficient that the error that can avoid theory hypothesis to bring can improve accuracy when line thunder protection counterattack is calculated several times.
Accompanying drawing explanation
Further illustrate the present invention below in conjunction with drawings and Examples.
Fig. 1 is the measuring principle figure of the first step; In Fig. 1, S is for measuring with impacting power supply; P is shunt; L is Luo-coil; C is oscillograph.R is the impact impedance of electric power line pole tower and shaft tower place earthed system; Z is the equiva lent impedance of lightning conducter; R
1for the equivalent stake resistance of lightning conducter, this stake resistance is by other tower grounding system earth resistance that are connected with lightning conducter, and the equivalence of System in Substation stake resistance forms; R
2for the equivalent stake resistance of the auxiliary earth utmost point.The line that in figure, solid line is metering circuit, dotted line is that shunt is connected oscillographic slotted line with Luo-coil.
Fig. 2 is the schematic diagram of measuring the mode of connection; Wherein 1 is electric power line pole tower; 2 is lightning conducter; 3 is wire; 4 is insulator chain; 5 is ground wire grounding downlead; 6 is tower grounding system; 7 is the auxiliary earth utmost point; 8 is ground; S is for measuring with impacting power supply; P is shunt; L is Luo-coil; C is oscillograph.Dotted line is that shunt is connected oscillographic slotted line with Luo-coil.Fig. 2 is the situation that electric power line pole tower only has two down conductors, in the time that transmission line of electricity has four shaft tower pin and four down conductors, need to adopt 4 Luo-coils, each Luo-coil surrounds down conductor or the shaft tower pin of a shaft tower, then 4 Luo-coils is together in series output terminal by the method for the 4th step.
Embodiment
Below by embodiment, by reference to the accompanying drawings, to technical scheme of the present invention, it is further described:
1. the method that the electric power line pole tower of measurement with lightning conducter impacts diverting coefficient, is characterized in that, it comprises the following steps:
The first step, collects shaft tower parameter, comprises tower grounding device catercorner length, pole tower forms;
Second step, near shaft tower, lay the auxiliary earth utmost point, the auxiliary earth utmost point should be at the more than 2 times of tower grounding device catercorner length to the distance of shaft tower, after being connected with shunt by high-voltage conducting wires, the high-pressure side that impacts power supply output is connected to shaft tower and lightning conducter and shaft tower junction, the low pressure end that impacts power supply output is extremely connected with auxiliary earth, and shunt resistance R is the high precision noninductive resistance of 0.01 ohm;
The 3rd step, regulates and impacts the output waveform of power supply, until wave head time, wave rear time meet relevant criterion and measures requirement;
High precision that the 4th step is 100A/1V by no-load voltage ratio is soft has shaft tower column foot or the down conductor of electrical connection to surround with Luo-coil and earth mat, and Luo-coil requires responsive bandwidth more than 200kHz, and input and output phase delay time is less than 0.1 microsecond;
The 5th step, presses by all Luo-coil output terminals the direction series connection that Same Name of Ends is identical, i.e. the different name end of another coil output of the termination of the same name of a coil output;
The 6th step, respectively the Luo-coil output terminal after the shunt in second step and the series connection of the 5th step is received to oscillographic two input channels, start and impact power supply output test dash current, record respectively the output voltage waveforms of shunt and Luo-coil group, the voltage waveform amplitude that records shunt output is U
1, the output voltage waveforms U of Luo-coil group
2, the diverting coefficient that obtains this measuring point place of electric power line pole tower by following formula is k.
In the first step of the present invention, when the resistance of shunt is R, the unit of R is ohm, in the time that R is not equal to 0.01 ohm, can calculate by following formula the diverting coefficient k at this measuring point place of electric power line pole tower;
In the present invention's the 3rd step, in the time that Luo-coil no-load voltage ratio is not 100A/1V, establishing its no-load voltage ratio is xA/yV, and x and y are any arithmetic number, can calculate by following formula the diverting coefficient k at this measuring point place of electric power line pole tower;
The present invention measures Luo-coil that dash current uses or replaces with other current measuring devices.
Embodiment
The first step, collects shaft tower parameter, and tower grounding device maximum diagonal length is 30m, and shaft tower is cement pole, only has two column foots.
Second step is laid the auxiliary earth utmost point near shaft tower, and the auxiliary earth utmost point is 100 meters to the distance of shaft tower; After the high-pressure side that impacts power supply output is connected with shunt by high-voltage conducting wires, be connected on a lightning conducter of head of mast, the low pressure end that impacts power supply output is extremely connected with auxiliary earth, and shunt is the high precision noninductive resistance of 0.01 ohm.
The 3rd step, regulates and impacts the output waveform of power supply, until wave head time, wave rear time meet relevant criterion and measures requirement.
The high precision that the 4th step is 100A/1V by no-load voltage ratio is soft with Luo-coil by the shaft tower bottoms of shaft tower firmly, and Luo-coil requires responsive bandwidth more than 200kHz, is output as alternating voltage waveform, and input and output phase delay time is less than 0.1 microsecond.
The 4th step, all Luo-coil output terminals are pressed to the direction series connection that Same Name of Ends is identical, in kind situation, two Luo-coils are connected, the different name end of another coil output of the termination of the same name of a coil output, measuring junction is the total output after all Luo-coils series connection.
The 5th step, respectively the Luo-coil output terminal after shunt and series connection is received to oscillographic two input channels, start and impact power supply output test lightning current, allow the output current be 100A, record respectively the output voltage waveforms of shunt and Luo-coil group, the voltage waveform amplitude that records shunt output is U
1=1V, the output voltage waveforms U of Luo-coil group
2=0.6V, the diverting coefficient that calculates this measuring point place of electric power line pole tower by following formula is k=0.6.
In above-mentioned steps, if when the resistance of shunt is R=0.001 ohm, the result U now recording
1=0.1V, U
2=0.6V, the expression formula of substitution diverting coefficient k is:
Now, the diverting coefficient at this measuring point place of electric power line pole tower is k=0.6.
In above-mentioned steps, the 3rd step, in the time that Luo-coil no-load voltage ratio is not 100A/1V, establishing its no-load voltage ratio is xA/yV, x=100 and y=5, the result U now recording
1=1V, U
2=3V, the expression formula of substitution diverting coefficient k is:
Now, the diverting coefficient at this measuring point place of electric power line pole tower is k=0.6.
Claims (4)
1. the method that the electric power line pole tower of measurement with lightning conducter impacts diverting coefficient, is characterized in that, it comprises the following steps:
The first step, collects shaft tower parameter, comprises tower grounding device catercorner length, pole tower forms;
Second step, near shaft tower, lay the auxiliary earth utmost point, the auxiliary earth utmost point should be at the more than 2 times of tower grounding device catercorner length to the distance of shaft tower, after being connected with shunt by high-voltage conducting wires, the high-pressure side that impacts power supply output is connected to shaft tower and lightning conducter and shaft tower junction, the low pressure end that impacts power supply output is extremely connected with auxiliary earth, and shunt resistance R is the high precision noninductive resistance of 0.01 ohm;
The 3rd step, regulates and impacts the output waveform of power supply, until wave head time, wave rear time meet relevant criterion and measures requirement;
High precision that the 4th step is 100A/1V by no-load voltage ratio is soft has shaft tower column foot or the down conductor of electrical connection to surround with Luo-coil and earth mat, and Luo-coil requires responsive bandwidth more than 200kHz, and input and output phase delay time is less than 0.1 microsecond;
The 5th step, presses by all Luo-coil output terminals the direction series connection that Same Name of Ends is identical, i.e. the different name end of another coil output of the termination of the same name of a coil output;
The 6th step, respectively the Luo-coil output terminal after the shunt in second step and the series connection of the 5th step is received to oscillographic two input channels, start and impact power supply output test dash current, record respectively the output voltage waveforms of shunt and Luo-coil group, the voltage waveform amplitude that records shunt output is U
1, the output voltage waveforms U of Luo-coil group
2, the diverting coefficient that obtains this measuring point place of electric power line pole tower by following formula is k,
2. the method that the electric power line pole tower of a kind of measurement according to claim 1 with lightning conducter impacts diverting coefficient, it is characterized in that, in the first step, when the resistance of shunt is R, the unit of R is ohm, in the time that R is not equal to 0.01 ohm, can calculate by following formula the diverting coefficient k at this measuring point place of electric power line pole tower
3. the method that the electric power line pole tower of a kind of measurement according to claim 1 with lightning conducter impacts diverting coefficient, it is characterized in that, in the 3rd step, in the time that Luo-coil no-load voltage ratio is not 100A/1V, if its no-load voltage ratio is xA/yV, x and y are any arithmetic number, can calculate by following formula the diverting coefficient k at this measuring point place of electric power line pole tower
4. the electric power line pole tower of a kind of measurement described in claim 1 or 3 with lightning conducter impacts the method for diverting coefficient, it is characterized in that, measures Luo-coil that dash current uses or with other current measuring devices replacements.
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| CN110865268B (en) * | 2019-12-03 | 2021-07-13 | 广东电网有限责任公司 | Method for testing lightning trip-out rate of transmission tower in low-soil resistivity region |
| CN110865265B (en) * | 2019-12-03 | 2021-07-13 | 广东电网有限责任公司 | Method for testing counterattack trip-out rate of power transmission line in mountain area |
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| CN110865266B (en) * | 2019-12-03 | 2021-07-13 | 广东电网有限责任公司 | Lightning-resistant horizontal test method for power transmission line of cross-shaped grounding device |
| CN110865270B (en) * | 2019-12-03 | 2021-07-13 | 广东电网有限责任公司 | 220kV power transmission line counterattack trip-out rate test method under lightning stroke |
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Address after: 650217 Yunnan city of Kunming Province Economic and Technological Development Zone West Middle Yun cloud electric science and Technology Park Co-patentee after: ELECTRIC POWER RESEARCH INSTITUTE, YUNNAN POWER GRID Co.,Ltd. Patentee after: YUN NAN ELECTRIC TEST & RESEARCH INSTITUTE GROUP Co.,Ltd. ELECTRIC INSTITUTE Co-patentee after: SOUTHWEST JIAOTONG University Address before: 650217 Yunnan city of Kunming Province Economic and Technological Development Zone West Middle Yun cloud electric science and Technology Park Co-patentee before: YUNNAN POWER GRID Co. TECHNOLOGY BRANCH Patentee before: YUN NAN ELECTRIC TEST & RESEARCH INSTITUTE GROUP Co.,Ltd. ELECTRIC INSTITUTE Co-patentee before: SOUTHWEST JIAOTONG University |
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Effective date of registration: 20200302 Address after: 650217 Yunnan city of Kunming Province Economic and Technological Development Zone West Middle Yun cloud electric science and Technology Park Co-patentee after: ELECTRIC POWER RESEARCH INSTITUTE, YUNNAN POWER GRID Co.,Ltd. Patentee after: YUN NAN ELECTRIC TEST & RESEARCH INSTITUTE GROUP Co.,Ltd. ELECTRIC INSTITUTE Address before: 650217 Yunnan city of Kunming Province Economic and Technological Development Zone West Middle Yun cloud electric science and Technology Park Co-patentee before: ELECTRIC POWER RESEARCH INSTITUTE, YUNNAN POWER GRID Co.,Ltd. Patentee before: YUN NAN ELECTRIC TEST & RESEARCH INSTITUTE GROUP Co.,Ltd. ELECTRIC INSTITUTE Co-patentee before: SOUTHWEST JIAOTONG University |