CN102129009A - Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information - Google Patents

Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information Download PDF

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CN102129009A
CN102129009A CN2011100037341A CN201110003734A CN102129009A CN 102129009 A CN102129009 A CN 102129009A CN 2011100037341 A CN2011100037341 A CN 2011100037341A CN 201110003734 A CN201110003734 A CN 201110003734A CN 102129009 A CN102129009 A CN 102129009A
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transmission line
electricity
positive sequence
phase
head
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CN102129009B (en
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胡志坚
李炜
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Wuhan University WHU
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Wuhan University WHU
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Abstract

The invention relates to the technical field of measuring parameters of a transmission line of a power system, in particular to a method for measuring positive sequence parameters of an ultra-high voltage transmission line based on double end measuring information. The method comprises: measuring positive sequence impedance and positive sequence capacitance of the transmission line; when measuring the positive sequence impedance of the transmission line, cutting off the to-be-measured transmission line, performing three-phase short connection to the tail end of the transmission line, adding a three-phase voltage on the front end of the transmission line; when measuring the positive sequence capacitance of the transmission line, cutting off the to-be-measured transmission line, performing three-phase opening to the tail end of the transmission line, adding the three-phase voltage on the front end of the transmission line; using a global satellite positioning system technology to simultaneously measure the three-phase voltage on two ends of the transmission line and the three-phase current on two ends of the transmission line, and synchronously sampling the three-phase voltage and three-phase current. The method in the invention solves the influence of the distributed capacitance on the transmission line to the positive sequence parameters measurement so as to greatly increase the precision of the positive sequence parameters measuring result of the transmission line.

Description

UHV transmission line measurement method for positive sequence parameter based on double-end measurement information
Technical field
The present invention relates to the power system transmission line parameter field of measuring technique, relate in particular to a kind of UHV transmission line measurement method for positive sequence parameter based on double-end measurement information.
Background technology
Transmission line of electricity is the carrier that electric power is carried, and is one of chief component of electric system, and electric system is played an important role.The power frequency parameter of transmission line of electricity mainly comprises mutual inductance between positive sequence impedance, positive sequence electric capacity, zero sequence impedance, zero sequence electric capacity and the many times mutual inductance circuits etc.; these parameters are used for electric system carries out trend calculating, calculation of short-circuit current, relay protection setting calculating and selects power system operation mode, and its accuracy is directly connected to the accuracy of these result of calculations.The parameter of obtaining transmission line of electricity exactly has important meaning for electric system, especially along with the continuous development of China's electric system, the continuous expansion of electrical network, improving constantly of Automation of Electric Systems degree, more and more higher to the accuracy requirement of transmission line parameter.
The calculating of line parameter circuit value is comparatively complicated, is subjected to the influence of a lot of uncertain factors simultaneously, comprises the factors such as geometric configuration, electric current, environment temperature, wind speed, soil resistivity, lightning conducter erection mode and line route of circuit.The circuit of long distance powedr transmission is sagging, the random nature of the kelvin effect of alive circuit and heating, geological condition or the like bring difficulty all can for the accurate Calculation line parameter circuit value.Usually known transmission line parameter is to measure at the circuit initial stage of building up, and these parameters can more or less change in the influence of back owing to factors such as weather, temperature, environment and geography that put into operation.Therefore, can't only rely on Theoretical Calculation to obtain the exact value of these parameters, line parameter circuit value needs periodic measurement.
Current power transmission line parameter circuit value measuring method has had deep research, and has developed corresponding measuring system device, puts into operation.Yet along with the continuous development of electric system, the increase of transmission line length, the rising of electric pressure makes the distributed capacitance of the transmission line of electricity ignored in original measuring system, must consider.
Simultaneously, UHV transmission line adopts the error of the centralized equivalence of transmission line parameter significantly to increase because electric pressure is high especially, transmission distance is long especially, at this moment must consider the influence of transmission line of electricity distributed capacitance.
Summary of the invention
Technical matters at above-mentioned existence, the purpose of this invention is to provide a kind of UHV transmission line measurement method for positive sequence parameter based on double-end measurement information, to overcome existing method big drawback of measuring error when measuring the positive order parameter of UHV (ultra-high voltage) and UHV transmission line, the transmission line of electricity positive sequence parameter measurement new method that proposes has realized the accurate measurement to the positive order parameter of transmission line of electricity.
For achieving the above object, the present invention adopts following technical scheme:
1. pressurization after transmission line of electricity to be measured being had a power failure obtains for positive sequence voltage and the forward-order current of measuring calculating usefulness;
2. utilize global satellite positioning, measure the three-phase voltage and the three-phase current of transmission line of electricity head and end simultaneously, this transmission line of electricity three-phase voltage and three-phase current are carried out synchronized sampling;
3. adopt the Fourier filtering algorithm to obtain the three-phase fundamental voltage and the three-phase fundamental current of transmission line of electricity head and end;
4. the three-phase fundamental voltage to head and end carries out positive-sequence component, negative sequence component, the zero-sequence component that the preface decomposition obtains the head and end fundamental voltage;
5. the three-phase fundamental current to head and end carries out positive-sequence component, negative sequence component, the zero-sequence component that the preface decomposition obtains the head and end fundamental current;
6. adopt following formula to calculate the positive sequence impedance that obtains this transmission line of electricity:
Wherein, r 1Be the positive sequence resistance of transmission line of electricity, unit is ohm, x 1Be the forward-sequence reactance of transmission line of electricity, unit is ohm; Be the positive sequence fundamental voltage of transmission line of electricity head end, unit is a volt; With Be the positive sequence fundamental current of transmission line of electricity head and end, unit is an ampere; K 1Be the correction factor relevant, K with transmission line length L 1=1+L/50 * k 1, k 1Be corrected parameter;
7. adopt following formula to calculate the positive sequence admittance that obtains this transmission line of electricity:
g 1Lead for the positive sequence electricity of transmission line of electricity, unit is a Siemens, b 1Be the positive sequence susceptance of transmission line of electricity, unit is a Siemens; With Be the positive sequence fundamental voltage of transmission line of electricity head and end, unit is a volt; The positive sequence fundamental current of transmission line of electricity head end, unit are ampere; K 2Be the correction factor relevant, K with transmission line length L 2=1+L/50 * k 2, k 2Be corrected parameter.
Described step 1. in, when measuring the positive sequence impedance of transmission line of electricity, transmission line of electricity to be measured is had a power failure, with the terminal three-phase short circuit of transmission line of electricity, add three-phase voltage at the transmission line of electricity head end;
Described step 1. in, when the positive sequence admittance of measuring transmission line of electricity, transmission line of electricity to be measured is had a power failure, with the terminal three-phase open circuit of transmission line of electricity, add three-phase voltage at the transmission line of electricity head end.
Described step utilizes in 2. the time service function of GPS to obtain the time reference of error less than 1 microsecond, at gps time synchronously down, after the transmission line of electricity head end added three-phase voltage, measuring system was gathered the three-phase voltage of transmission line of electricity first and last end and the three-phase current of transmission line of electricity first and last end simultaneously.
Described step 6. in, if adopt the alien frequencies power supply to measure, then the reactance x1 that measures is revised, the reactance when obtaining power frequency, adopt following formula to revise:
Wherein, middle f Alien frequenciesBe the frequency of alien frequencies power supply, x 1 power frequencyForward-sequence reactance during for power frequency.
Described step 7. in, transmission line of electricity positive sequence electricity is led g 1Very little, ignore, then positive sequence electric capacity c 1Computing formula be:
Wherein, middle f is the frequency of power frequency supply, and the imaginary part component of phasor is got in Im () expression.
If adopt the alien frequencies power supply to measure, then to by The electric capacity c that formula measures 1Revise, obtain the positive sequence capacitance parameter under the power frequency, adopt following correction formula:
Wherein, f Alien frequenciesBe the frequency of alien frequencies power supply, c 1 power frequencyPositive sequence electric capacity during for power frequency.
Described step 6. in, corrected parameter k 1As follows with the value relation of transmission line length L, wherein the unit of L is a kilometer:
As 0<L≤100, k 1=0.000; As 100<L≤200,0.000<k 1≤ 0.001; As 200<L≤400,0.001<k 1≤ 0.002; As 400<L≤600,0.002<k 1≤ 0.003; As 600<L≤800,0.003<k 1≤ 0.004; As 800<L≤900,0.004<k 1≤ 0.005; As 900<L≤1000,0.005<k 1≤ 0.006; As 1000<L≤1100,0.006<k 1≤ 0.007; As 1100<L≤1200,0.007<k 1≤ 0.0075; As 1200<L≤1300,0.0075<k 1≤ 0.0085; As 1300<L≤1400,0.0085<k 1≤ 0.0095; As 1400<L≤1500,0.0095<k 1≤ 0.0105; As 1500<L≤1600,0.0105<k 1≤ 0.0115.
Described step 7. in, corrected parameter k 2With as follows with the value relation of transmission line length L, wherein the unit of L is a kilometer:
As 0<L≤50, k 2=0.0000; As 50<L≤100,0.0000<k 2≤ 0.0003; As 100<L≤150,0.0003<k 2≤ 0.0005; As 150<L≤200,0.0005<k 2≤ 0.0008; As 200<L≤250,0.0008<k 2≤ 0.0011; As 250<L≤300,0.0011<k 2≤ 0.0014; As 300<L≤350,0.0014<k 2≤ 0.0017; As 350<L≤400,0.0017<k 2≤ 0.0020; As 400<L≤450,0.0020<k 2≤ 0.0023; As 450<L≤500,0.0023<k 2≤ 0.0026; As 500<L≤550,0.0026<k 2≤ 0.0029; As 550<L≤600,0.0029<k 2≤ 0.0032; As 600<L≤650,0.0032<k 2≤ 0.0035; As 650<L≤700,0.0035<k 2≤ 0.0038; As 700<L≤750,0.0038<k 2≤ 0.0041; As 750<L≤800,0.0041<k 2≤ 0.0044; As 800<L≤850,0.0044<k 2≤ 0.0048; As 850<L≤900,0.0048<k 2≤ 0.0051; As 900<L≤950,0.0051<k 2≤ 0.0055; As 950<L≤1000,0.0055<k 2≤ 0.0059; As 1000<L≤1050,0.0059<k 2≤ 0.0063; As 1050<L≤1100,0.0063<k 2≤ 0.0067; As 1100<L≤1150,0.0067<k 2≤ 0.0071; As 1150<L≤1200,0.0071<k 2≤ 0.0075; As 1200<L≤1250,0.0075<k 2≤ 0.0079; As 1250<L≤1300,0.0079<k 2≤ 0.0083; As 1300<L≤1350,0.0083<k 2≤ 0.0087; As 1350<L≤1400,0.0087<k 2≤ 0.0092; As 1400<L≤1450,0.0092<k 2≤ 0.0097; As 1450<L≤1500,0.0097<k 2≤ 0.0102; As 1500<L≤1550,0.0102<k 2≤ 0.0107; As 1550<L≤1600,0.0107<k 2≤ 0.0112.
The present invention has the following advantages and good effect:
1) the present invention need gather the three-phase voltage and the three-phase current of transmission line of electricity head and end simultaneously, has taken into account the influence of the distributed capacitance on the transmission line of electricity, thereby is particularly suitable for the measurement of the positive order parameter of extra-high voltage long distance transmission line;
2) the present invention utilizes the GPS technology to solve the simultaneity problem of strange land signal measurement, not only is fit to the measurement of one the positive order parameter of transmission line of electricity, especially is fit to measure the positive order parameter of UHV transmission line;
3) the present invention not only is fit to adopt power frequency supply to measure, and also is fit to adopt the alien frequencies power supply to measure;
4) the present invention is by measuring the positive sequence voltage and the forward-order current at transmission line of electricity two ends, again the mean value of circuit two ends positive sequence voltage phasor mean value and forward-order current phasor is revised, solve the distributed capacitance on the transmission line of electricity and aligned the influence that order parameter is measured, thereby improved the precision of transmission line of electricity positive sequence parameter measurements greatly.
Description of drawings
Fig. 1 is that the transmission line of electricity positive sequence impedance is measured connection diagram among the present invention.
Fig. 2 is a transmission line of electricity positive sequence capacitance measurement connection diagram among the present invention.
Embodiment
The invention will be further described in conjunction with the accompanying drawings with specific embodiment below:
UHV transmission line measurement method for positive sequence parameter based on double-end measurement information provided by the invention, adopt following steps:
Step 1: tested transmission line of electricity is had a power failure.
Step 2: when measuring the positive sequence impedance of transmission line of electricity, the terminal three-phase short circuit with transmission line of electricity applies three-phase main-frequency voltage at the transmission line of electricity head end, measures wiring as shown in Figure 1.PT is a voltage transformer (VT) among the figure, and CT is a current transformer.Under the Global Positioning System (GPS) time synchronized, be arranged in the measuring system A of transmission line of electricity head and end and three-phase voltage that measuring system B measures the transmission line of electricity head end simultaneously and the three-phase current of transmission line of electricity head and end.
When measuring the positive sequence electric capacity of transmission line of electricity, the terminal three-phase open circuit with transmission line of electricity applies three-phase voltage at the transmission line of electricity head end, measures wiring as shown in Figure 2.PT is a voltage transformer (VT) among the figure, and CT is a current transformer.Under the Global Positioning System (GPS) time synchronized, be arranged in the measuring system A of transmission line of electricity head and end and three-phase voltage that measuring system B measures the transmission line of electricity head and end simultaneously and the three-phase current of transmission line of electricity head end.
Step 3: the three-phase voltage and the three-phase current of the transmission line of electricity that measuring system A and B are gathered, adopt the Fourier filtering algorithm to obtain the three-phase fundamental voltage of transmission line of electricity head and end earlier With the three-phase fundamental current Utilize formula (1) and (2) that head and end fundamental voltage and head and end fundamental current are carried out positive-sequence component, negative sequence component and the zero-sequence component that the preface decomposition obtains the head and end fundamental voltage again Utilize formula (3) and (4) to obtain positive-sequence component, negative sequence component and the zero-sequence component of transmission line of electricity head and end fundamental current
(1)
(1) in formula, (2) formula, (3) formula and (4) formula, α=e J120 °
Step 4: with the positive sequence voltage of transmission line of electricity head end And the forward-order current of transmission line of electricity head and end With Substitution
(2) formula can be obtained the positive sequence impedance parameter z of transmission line of electricity 1
K 1Be the correction factor relevant, K with transmission line length L 1=1+L/50 * k 1, k 1Value shown in following table table 1.
Table 1 k 1Value
Transmission line length L (kilometer) k 1
0<L≤100 k 1=0.000
100<L≤200 0.000<k 1≤0.001
200<L≤400 0.001<k 1≤0.002
400<L≤600 0.002<k 1≤0.003
600<L≤800 0.003<k 1≤0.004
800<L≤900 0.004<k 1≤0.005
900<L≤1000 0.005<k 1≤0.006
1000<L≤1100 0.006<k 1≤0.007
1100<L≤1200 0.007<k 1≤0.0075
1200<L≤1300 0.0075<k 1≤0.0085
1300<L≤1400 0.0085<k 1≤0.0095
1400<L≤1500 0.0095<k 1≤0.0105
1500<L≤1600 0.0105<k 1≤0.0115
If adopt the alien frequencies power supply to measure, then need the reactance x that measures by (5) formula 1Revise, obtain the forward-sequence reactance under the power frequency.Correction formula is:
Positive sequence voltage with the transmission line of electricity head and end With And the forward-order current of transmission line of electricity head end Substitution (7) formula can be obtained the positive sequence admittance parameter g of transmission line of electricity 1+ jb 1
K 2Be the correction factor relevant, K with transmission line length L 2=1+L/50 * k 2, k 2Value shown in following table table 2:
Table 2 k 2Value
Transmission line length L (kilometer) k 2
0<L≤50 k 2=0.0000
50<L≤100 0.0000<k 2≤0.0003
100<L≤150 0.0003<k 2≤0.0005
150<L≤200 0.0005<k 2≤0.0008
200<L≤250 0.0008<k 2≤0.0011
250<L≤300 0.0011<k 2≤0.0014
300<L≤350 0.0014<k 2≤0.0017
350<L≤400 0.0017<k 2≤0.0020
400<L≤450 0.0020<k 2≤0.0023
450<L≤500 0.0023<k 2≤0.0026
500<L≤550 0.0026<k 2≤0.0029
550<L≤600 0.0029<k 2≤0.0032
600<L≤650 0.0032<k 2≤0.0035
650<L≤700 0.0035<k 2≤0.0038
700<L≤750 0.0038<k 2≤0.0041
750<L≤800 0.0041<k 2≤0.0044
800<L≤850 0.0044<k 2≤0.0048
850<L≤900 0.0048<k 2≤0.0051
900<L≤950 0.0051<k 2≤0.0055
950<L≤1000 0.0055<k 2≤0.0059
1000<L≤1050 0.0059<k 2≤0.0063
1050<L≤1100 0.0063<k 2≤0.0067
1100<L≤1150 0.0067<k 2≤0.0071
1150<L≤1200 0.0071<k 2≤0.0075
1200<L≤1250 0.0075<k 2≤0.0079
1250<L≤1300 0.0079<k 2≤0.0083
1300<L≤1350 0.0083<k 2≤0.0087
1350<L≤1400 0.0087<k 2≤0.0092
1400<L≤1450 0.0092<k 2≤0.0097
1450<L≤1500 0.0097<k 2≤0.0102
1500<L≤1550 0.0102<k 2≤0.0107
1550<L≤1600 0.0107<k 2≤0.0112
Usually, transmission line of electricity positive sequence electricity is led g 1Very little, can ignore, then positive sequence electric capacity c 1Computing formula be:
(8) f is a work frequency in the formula, and the imaginary part component of phasor is got in Im () expression.
If adopt the alien frequencies power supply to measure, then the frequency f in (8) formula is the alien frequencies frequency, need be to the electric capacity c that is measured by (8) formula 1Revise, obtain the positive sequence electric capacity under the power frequency.Correction formula is:
(9) f in the formula Alien frequenciesBe the frequency of alien frequencies power supply, c 1 power frequencyPositive sequence electric capacity during for power frequency.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique; under the situation that does not break away from the spirit and scope of the present invention; can also make various conversion or modification, so all technical schemes that are equal to, all fall into protection scope of the present invention.

Claims (8)

1. the UHV transmission line measurement method for positive sequence parameter based on double-end measurement information is characterized in that, may further comprise the steps:
1. pressurization after transmission line of electricity to be measured being had a power failure obtains for positive sequence voltage and the forward-order current of measuring calculating usefulness;
2. utilize global satellite positioning, measure the three-phase voltage and the three-phase current of transmission line of electricity head and end simultaneously, this transmission line of electricity three-phase voltage and three-phase current are carried out synchronized sampling;
3. adopt the Fourier filtering algorithm to obtain the three-phase fundamental voltage and the three-phase fundamental current of transmission line of electricity head and end;
4. the three-phase fundamental voltage to head and end carries out positive-sequence component, negative sequence component, the zero-sequence component that the preface decomposition obtains the head and end fundamental voltage;
5. the three-phase fundamental current to head and end carries out positive-sequence component, negative sequence component, the zero-sequence component that the preface decomposition obtains the head and end fundamental current;
6. adopt following formula to calculate the positive sequence impedance that obtains this transmission line of electricity:
Wherein, r 1Be the positive sequence resistance of transmission line of electricity, unit is ohm, x 1Be the forward-sequence reactance of transmission line of electricity, unit is ohm; Be the positive sequence fundamental voltage of transmission line of electricity head end, unit is a volt; With Be the positive sequence fundamental current of transmission line of electricity head and end, unit is an ampere; K 1Be the correction factor relevant, K with transmission line length L 1=1+L/50 * k 1, k 1Be corrected parameter;
7. adopt following formula to calculate the positive sequence admittance that obtains this transmission line of electricity:
g 1Lead for the positive sequence electricity of transmission line of electricity, unit is a Siemens, b 1Be the positive sequence susceptance of transmission line of electricity, unit is a Siemens; With Be the positive sequence fundamental voltage of transmission line of electricity head and end, unit is a volt; The positive sequence fundamental current of transmission line of electricity head end, unit are ampere; K 2Be the correction factor relevant, K with transmission line length L 2=1+L/50 * k 2, k 2Be corrected parameter.
2. the UHV transmission line measurement method for positive sequence parameter based on double-end measurement information according to claim 1 is characterized in that:
Described step 1. in, when measuring the positive sequence impedance of transmission line of electricity, transmission line of electricity to be measured is had a power failure, with the terminal three-phase short circuit of transmission line of electricity, add three-phase voltage at the transmission line of electricity head end;
Described step 1. in, when the positive sequence admittance of measuring transmission line of electricity, transmission line of electricity to be measured is had a power failure, with the terminal three-phase open circuit of transmission line of electricity, add three-phase voltage at the transmission line of electricity head end.
3. the UHV transmission line measurement method for positive sequence parameter based on double-end measurement information according to claim 1 is characterized in that:
Described step utilizes in 2. the time service function of GPS to obtain the time reference of error less than 1 microsecond, at gps time synchronously down, after the transmission line of electricity head end added three-phase voltage, measuring system was gathered the three-phase voltage of transmission line of electricity first and last end and the three-phase current of transmission line of electricity first and last end simultaneously.
4. according to each described UHV transmission line measurement method for positive sequence parameter among the claim 1-3, it is characterized in that based on double-end measurement information:
Described step 6. in, if adopt the alien frequencies power supply to measure, reactance x then to measuring 1Revise, the reactance when obtaining power frequency, adopt following formula to revise:
Wherein, middle f Alien frequenciesBe the frequency of alien frequencies power supply, x 1 power frequencyForward-sequence reactance during for power frequency.
5. according to each described UHV transmission line measurement method for positive sequence parameter among the claim 1-3, it is characterized in that based on double-end measurement information:
Described step 7. in, transmission line of electricity positive sequence electricity is led g 1Very little, ignore, then positive sequence electric capacity c 1Computing formula be:
Wherein, middle f is the frequency of power frequency supply, and the imaginary part component of phasor is got in Im () expression.
6. the UHV transmission line measurement method for positive sequence parameter based on double-end measurement information according to claim 5 is characterized in that:
If adopt the alien frequencies power supply to measure, then to by The electric capacity c that formula measures 1Revise, obtain the positive sequence capacitance parameter under the power frequency, adopt following correction formula:
Wherein, f Alien frequenciesBe the frequency of alien frequencies power supply, c 1 power frequencyPositive sequence electric capacity during for power frequency.
7. the UHV transmission line measurement method for positive sequence parameter based on double-end measurement information according to claim 1 is characterized in that:
Described step 6. in, corrected parameter k 1As follows with the value relation of transmission line length L, wherein the unit of L is a kilometer:
As 0<L≤100, k 1=0.000; As 100<L≤200,0.000<k 1≤ 0.001; As 200<L≤400,0.001<k 1≤ 0.002; As 400<L≤600,0.002<k 1≤ 0.003; As 600<L≤800,0.003<k 1≤ 0.004; As 800<L≤900,0.004<k 1≤ 0.005; As 900<L≤1000,0.005<k 1≤ 0.006; As 1000<L≤1100,0.006<k 1≤ 0.007; As 1100<L≤1200,0.007<k 1≤ 0.0075; As 1200<L≤1300,0.0075<k 1≤ 0.0085; As 1300<L≤1400,0.0085<k 1≤ 0.0095; As 1400<L≤1500,0.0095<k 1≤ 0.0105; As 1500<L≤1600,0.0105<k 1≤ 0.0115.
8. according to claim 1 or 7 described UHV transmission line measurement method for positive sequence parameter, it is characterized in that based on double-end measurement information:
Described step 7. in, corrected parameter k 2With as follows with the value relation of transmission line length L, wherein the unit of L is a kilometer:
As 0<L≤50, k 2=0.0000; As 50<L≤100,0.0000<k 2≤ 0.0003; As 100<L≤150,0.0003<k 2≤ 0.0005; As 150<L≤200,0.0005<k 2≤ 0.0008; As 200<L≤250,0.0008<k 2≤ 0.0011; As 250<L≤300,0.0011<k 2≤ 0.0014; As 300<L≤350,0.0014<k 2≤ 0.0017; As 350<L≤400,0.0017<k 2≤ 0.0020; As 400<L≤450,0.0020<k 2≤ 0.0023; As 450<L≤500,0.0023<k 2≤ 0.0026; As 500<L≤550,0.0026<k 2≤ 0.0029; As 550<L≤600,0.0029<k 2≤ 0.0032; As 600<L≤650,0.0032<k 2≤ 0.0035; As 650<L≤700,0.0035<k 2≤ 0.0038; As 700<L≤750,0.0038<k 2≤ 0.0041; As 750<L≤800,0.0041<k 2≤ 0.0044; As 800<L≤850,0.0044<k 2≤ 0.0048; As 850<L≤900,0.0048<k 2≤ 0.0051; As 900<L≤950,0.0051<k 2≤ 0.0055; As 950<L≤1000,0.0055<k 2≤ 0.0059; As 1000<L≤1050,0.0059<k 2≤ 0.0063; As 1050<L≤1100,0.0063<k 2≤ 0.0067; As 1100<L≤1150,0.0067<k 2≤ 0.0071; As 1150<L≤1200,0.0071<k 2≤ 0.0075; As 1200<L≤1250,0.0075<k 2≤ 0.0079; As 1250<L≤1300,0.0079<k 2≤ 0.0083; As 1300<L≤1350,0.0083<k 2≤ 0.0087; As 1350<L≤1400,0.0087<k 2≤ 0.0092; As 1400<L≤1450,0.0092<k 2≤ 0.0097; As 1450<L≤1500,0.0097<k 2≤ 0.0102; As 1500<L≤1550,0.0102<k 2≤ 0.0107; As 1550<L≤1600,0.0107<k 2≤ 0.0112.
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CN102435851A (en) * 2011-09-20 2012-05-02 武汉大学 Method for measuring zero-sequence parameters of double-circuit transmission lines
CN102979512A (en) * 2012-11-28 2013-03-20 中国石油大学(北京) Black box analyzing method and device for acquiring transmission characteristic of logging cable
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CN107328996A (en) * 2017-06-12 2017-11-07 华北电力大学 Robust electric transmission line positive sequence parameter identification method
CN109241626A (en) * 2018-09-07 2019-01-18 福建水利电力职业技术学院 A kind of calculation method of power transmission line power frequency order parameter
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