CN102621389A - Test methods of mutual impedance and coupling capacitance of transmission lines in parallel - Google Patents
Test methods of mutual impedance and coupling capacitance of transmission lines in parallel Download PDFInfo
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- CN102621389A CN102621389A CN2011100344231A CN201110034423A CN102621389A CN 102621389 A CN102621389 A CN 102621389A CN 2011100344231 A CN2011100344231 A CN 2011100344231A CN 201110034423 A CN201110034423 A CN 201110034423A CN 102621389 A CN102621389 A CN 102621389A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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Abstract
The invention relates to test methods of mutual impedance and coupling capacitance of transmission lines in parallel. The test method of mutual impedance comprises the following steps that: a head end of one phase test line in a test line accesses a pilot frequency testing voltage and the end of the phase test line is grounded; the head end voltage, the head end current and the end current of the phase test line are tested and a voltage power frequency component and a current pilot frequency component are calculated; a head end voltage and a head end current of one phase operation line in an operation line are tested and a voltage pilot frequency component and a current power frequency component are calculated; and according to the current pilot frequency component and the voltage pilot frequency component, the mutual impedance between the phase test line and the phase operation line is calculated. According to the test methods provided by the invention, mutual impedance and coupling capacitance of transmission lines in parallel can be accurately tested under the circumstances that the lines are operated and there is no power failure, thereby improving test efficiency and accuracy.
Description
Technical field
The present invention relates to a kind of alien frequencies method of addition of parallel transmission line of electricity coupling parameter, relate in particular to a kind of transimpedance of parallel transmission line of electricity, the method for testing of coupling capacitance.
Background technology
Transmission line of electricity is the important component part of electric system, and the line parameter circuit value of transmission line of electricity need be measured at the circuit initial stage of building up.Though and these parameters can not change in the quite a long period, because aging, the soil resistivity of the back lead that puts into operation for a long time change, perhaps the influence of factors such as weather, environment and geography all may make line parameter circuit value change.Therefore, power scheduling department requires the power frequency parameter of actual measurement transmission line of electricity.Power frequency parameter generally comprises transimpedance and the coupling capacitance between direct current resistance, positive sequence impedance, alternate electric capacity, positive sequence electric capacity, zero sequence electric capacity and many times parallel transmission lines of electricity.
Yet, to the parameter testing of parallel transmission line of electricity, the especially test of the coupling parameter between many times parallel transmission lines of electricity, the power failure scope that relates to is extremely wide, and has strong the interference, hardly maybe be at actual test implementation.And parameter is accurately most important for electric power netting safe running, therefore, needs a kind ofly can under the condition that line related " does not have a power failure ", carry out the method for accurate measurement circuit coupling parameter.
Summary of the invention
The object of the present invention is to provide a kind of method of under line related " does not have a power failure " condition, accurately testing the transimpedance of parallel transmission line of electricity.
Another object of the present invention is to provide a kind of method of under line related " does not have a power failure " condition, accurately testing the coupling capacitance of parallel transmission line of electricity.
A kind of method of testing of transimpedance of parallel transmission line of electricity; Said parallel transmission line of electricity comprises measurement circuit and working line; The method of testing of the transimpedance of said parallel transmission line of electricity comprises the steps: the head end of the phase measurement circuit in the said measurement circuit is inserted alien frequencies trial voltage, the terminal ground connection of said phase measurement circuit; Test head end voltage, head end electric current, the end current of said phase measurement circuit, and calculate voltage power frequency component and electric current alien frequencies component; Test head end voltage, the head end electric current of the phase working line in the said working line, and calculate voltage alien frequencies component and electric current power frequency component; Calculate said phase measurement circuit and said transimpedance between the working line mutually according to said electric current alien frequencies component and voltage alien frequencies component.
The preferred a kind of technical scheme of above-mentioned transimpedance method of testing; Said parallel transmission line of electricity is a double-circuit line; Said phase measurement circuit and said transimpedance between the working line mutually
are wherein;
is said voltage power frequency component;
is said electric current alien frequencies component;
is said voltage alien frequencies component, and
is said electric current power frequency component.
The preferred a kind of technical scheme of above-mentioned transimpedance method of testing; Said parallel transmission line of electricity is many loop lines road; Said phase measurement circuit and said transimpedance between the working line mutually
are wherein;
is said voltage alien frequencies component,
be said electric current alien frequencies component.
The preferred a kind of technical scheme of above-mentioned transimpedance method of testing, the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.
The preferred a kind of technical scheme of above-mentioned transimpedance method of testing adopts said method of testing to test said phase measurement circuit and is no less than 10 times with the said number of times of the transimpedance between the working line mutually.
A kind of method of testing of coupling capacitance of parallel transmission line of electricity; Said parallel transmission line of electricity comprises measurement circuit and working line; The method of testing of the coupling capacitance of said parallel transmission line of electricity comprises the steps: the head end of the phase measurement circuit in the said measurement circuit is inserted alien frequencies trial voltage, the terminal open circuit of said phase measurement circuit; Test head end voltage, head end electric current, end current and the frequency of said phase measurement circuit, and calculate voltage power frequency component and electric current power frequency component; Test head end voltage, head end electric current and the frequency of the phase working line in the said working line, and calculate voltage alien frequencies component and electric current alien frequencies component; Calculate said phase measurement circuit and said coupling capacitance between the working line mutually according to said electric current alien frequencies component and voltage alien frequencies component.
The preferred a kind of technical scheme of above-mentioned coupling capacitance method of testing, said parallel transmission line of electricity is a double-circuit line, said phase measurement circuit and said coupling capacitance between the working line mutually
Wherein,
Be the voltage power frequency component,
Be electric current power frequency component, f
1Be the alien frequencies frequency,
Be voltage alien frequencies component,
Be electric current alien frequencies component, f
2Be work frequency.
The preferred a kind of technical scheme of above-mentioned coupling capacitance method of testing, said parallel transmission line of electricity is many loop lines road, said phase measurement circuit and said coupling capacitance between the working line mutually
Wherein,
Be voltage alien frequencies component,
Be electric current alien frequencies component, f
2Be work frequency.
The preferred a kind of technical scheme of above-mentioned coupling capacitance method of testing, the SF of said method of testing is fs, then
Wherein, f
1Be alien frequencies frequency, f
2Be work frequency, N is a sampling length.
The preferred a kind of technical scheme of above-mentioned coupling capacitance method of testing, the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.
The transimpedance of parallel transmission line of electricity of the present invention, the method for testing of coupling capacitance, not under the condition of " power failure ", transimpedance, the coupling capacitance that can accurately test parallel transmission line of electricity have improved detection efficiency and accuracy at working line.
Description of drawings
Fig. 1 is the synoptic diagram of test philosophy of the transimpedance of parallel transmission line of electricity of the present invention.
Fig. 2 is the process flow diagram of method of testing of the transimpedance of parallel transmission line of electricity of the present invention.
Fig. 3 is the synoptic diagram of test philosophy of the coupling capacitance of parallel transmission line of electricity of the present invention.
Fig. 4 is the process flow diagram of method of testing of the coupling capacitance of parallel transmission line of electricity of the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, be example below with the double back transmission line, the present invention is made further detailed description.
In method of testing of the present invention; The parallel double back transmission line comprises measurement circuit and working line; Wherein, measurement circuit comprises A phase measurement circuit, B phase measurement circuit and C measurement circuit mutually, and working line comprises A phase working line, B phase working line and C working line mutually.Said A phase measurement circuit is corresponding with said A phase working line, and said B phase measurement circuit is corresponding with said B phase working line, and said C phase measurement circuit is corresponding with said C phase working line.
Be example with B phase measurement circuit in the test double back transmission line and the transimpedance between the B phase working line below, specify the method for testing of the transimpedance of parallel transmission line of electricity of the present invention.See also Fig. 1, Fig. 1 is the synoptic diagram of test philosophy of the transimpedance of parallel transmission line of electricity of the present invention.The head end of said B phase measurement circuit inserts alien frequencies trial voltage Us, the terminal ground connection of said B phase measurement circuit.Preferably, the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.Head end measurement mechanism 11 passes through first voltage transformer (VT) 13 is connected said B phase measurement circuit with first current transformer 14 head end, is used to test the head end voltage and the head end electric current of said B phase measurement circuit.Said head end measurement mechanism 11 also is connected the head end of said B phase working line with second current transformer 16 through second voltage transformer (VT) 15, be used to test the head end voltage and the head end electric current of said B phase working line.Terminal measurement mechanism 12 is used to test the end current of said B phase working line through the end of the said B phase working line of the 3rd current transformer 17 connections.
See also Fig. 2, Fig. 2 is the process flow diagram of method of testing of the transimpedance of parallel transmission line of electricity of the present invention.The method of testing of the transimpedance of parallel transmission line of electricity of the present invention comprises the steps:
The head end of said B phase measurement circuit is inserted alien frequencies trial voltage, the terminal ground connection of said B phase measurement circuit.Preferably, the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.
Measure head end voltage, head end electric current, the end current of said B phase measurement circuit, and calculate voltage power frequency component
and electric current alien frequencies component
Measure head end voltage, the head end electric current of said B phase working line; And it is preferred to calculate voltage alien frequencies component
and electric current power frequency component
, and said B phase measurement circuit and said B be the first terminal synchronism detection record ripple of working line mutually.
Calculate said B phase measurement circuit and the said B transimpedance between the working line mutually according to formula (1), and then convert to 50Hz.
According to above-mentioned method of testing; Corresponding measurement circuit is changed pressurization and test wiring, can measure A phase measurement circuit and the A transimpedance between working line, A phase measurement circuit and B phase working line, A phase measurement circuit and C phase working line, B phase measurement circuit and A phase working line, B phase measurement circuit and C phase working line, C phase measurement circuit and A phase working line, C phase measurement circuit and B phase working line, C phase measurement circuit and the C phase working line mutually respectively.
The method of testing of the transimpedance of parallel transmission line of electricity of the present invention also is applicable to parallel many back transmission lines.When testing the transimpedance between many back transmission lines, use above-mentioned method of testing, test getting final product according to parallel combination.For parallel many back transmission lines, in order further to improve precision of test result, the transimpedance between measurement circuit and the corresponding working line
Wherein,
is the voltage alien frequencies component of working line,
be the electric current alien frequencies component of measurement circuit.
Preferably, in the method for testing of the transimpedance of parallel transmission line of electricity of the present invention, the testing time of the transimpedance between every phase measurement circuit and the corresponding working line is no less than 10 times, therefrom chooses optimal value or mean value.Preferably, in method of testing of the present invention, select digital filter for use.SF f in the method for testing of the present invention
sShould satisfy formula (3) requirement with choosing of sampling time,
Wherein, f
1Be alien frequencies frequency, f
2Be work frequency, N is a sampling length.
Be example with B phase measurement circuit in the test double back transmission line and the coupling capacitance between the B phase working line below, specify the method for testing of the coupling capacitance of parallel transmission line of electricity of the present invention.See also Fig. 3, Fig. 3 is the synoptic diagram of test philosophy of the coupling capacitance of parallel transmission line of electricity of the present invention.The head end of said B phase measurement circuit inserts alien frequencies trial voltage Us, the terminal open circuit of said B phase measurement circuit.Preferably, the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.Head end measurement mechanism 21 passes through first voltage transformer (VT) 23 is connected said B phase measurement circuit with first current transformer 24 head end, is used to test the head end voltage and the head end electric current of said B phase measurement circuit.Said head end measurement mechanism 21 also is connected the head end of said B phase working line with second current transformer 26 through second voltage transformer (VT) 25, be used to test the head end voltage and the head end electric current of said B phase working line.Terminal measurement mechanism 22 is used to test the end current of said B phase working line through the end of the said B phase working line of the 3rd current transformer 27 connections.
See also Fig. 4, Fig. 4 is the process flow diagram of method of testing of the coupling capacitance of parallel transmission line of electricity of the present invention.The method of testing of the coupling capacitance of parallel transmission line of electricity of the present invention comprises the steps:
The head end of said B phase measurement circuit is inserted alien frequencies trial voltage, the terminal open circuit of said B phase measurement circuit.Preferably, the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.
Measure head end voltage, head end electric current, the end current of said B phase measurement circuit, and calculate voltage power frequency component
and electric current power frequency component
Measure head end voltage, the head end electric current of said B phase working line; And it is preferred to calculate voltage alien frequencies component
and electric current alien frequencies component
, and said B phase measurement circuit and said B be the first terminal synchronism detection record ripple of working line mutually.
Calculate said B phase measurement circuit and the said B coupling capacitance between the working line mutually according to formula (4), and then convert to 50Hz.
According to above-mentioned method of testing; Corresponding measurement circuit is changed pressurization and test wiring, can measure A phase measurement circuit and the A coupling capacitance between working line, A phase measurement circuit and B phase working line, A phase measurement circuit and C phase working line, B phase measurement circuit and A phase working line, B phase measurement circuit and C phase working line, C phase measurement circuit and A phase working line, C phase measurement circuit and B phase working line, C phase measurement circuit and the C phase working line mutually respectively.
The method of testing of the coupling capacitance of parallel transmission line of electricity of the present invention also is applicable to parallel many back transmission lines.When testing the coupling capacitance between many back transmission lines, use above-mentioned method of testing, test getting final product according to parallel combination.For parallel many back transmission lines, in order further to improve precision of test result, the coupling capacitance between measurement circuit and the corresponding working line
Wherein,
is the voltage alien frequencies component of working line,
be the electric current alien frequencies component of working line.
Preferably, in the method for testing of the coupling capacitance of parallel transmission line of electricity of the present invention, the testing time of the coupling capacitance between every phase measurement circuit and the corresponding working line is no less than 10 times, therefrom chooses optimal value or mean value.Preferably, in method of testing of the present invention, select digital filter for use.SF f in the method for testing of the present invention
sShould satisfy formula (6) requirement with choosing of sampling time,
Wherein, f
1Be alien frequencies frequency, f
2Be work frequency, N is a sampling length.
Compared with prior art; The transimpedance of parallel transmission line of electricity of the present invention, the method for testing of coupling capacitance; Not under the condition of " power failure ", transimpedance, the coupling capacitance that can accurately test parallel transmission line of electricity have improved detection efficiency and accuracy at working line.
Under situation without departing from the spirit and scope of the present invention, can also constitute many very embodiment of big difference that have.Should be appreciated that except like enclosed claim limited, the present invention is not limited at the specific embodiment described in the instructions.
Claims (10)
1. the method for testing of the transimpedance of a parallel transmission line of electricity is characterized in that, said parallel transmission line of electricity comprises measurement circuit and working line, and the method for testing of the transimpedance of said parallel transmission line of electricity comprises the steps:
The head end of the phase measurement circuit in the said measurement circuit is inserted alien frequencies trial voltage, the terminal ground connection of said phase measurement circuit;
Test head end voltage, head end electric current, the end current of said phase measurement circuit, and calculate voltage power frequency component and electric current alien frequencies component;
Test head end voltage, the head end electric current of the phase working line in the said working line, and calculate voltage alien frequencies component and electric current power frequency component;
Calculate said phase measurement circuit and said transimpedance between the working line mutually according to said electric current alien frequencies component and voltage alien frequencies component.
2. the method for testing of the transimpedance of parallel transmission line of electricity as claimed in claim 1; It is characterized in that; Said parallel transmission line of electricity is a double-circuit line; Said phase measurement circuit and said transimpedance between the working line mutually
are wherein;
is said voltage power frequency component;
is said electric current alien frequencies component;
is said voltage alien frequencies component, and
is said electric current power frequency component.
3. the method for testing of the transimpedance of parallel transmission line of electricity as claimed in claim 1; It is characterized in that; Said parallel transmission line of electricity is many loop lines road; Said phase measurement circuit and said transimpedance between the working line mutually
are wherein;
is said voltage alien frequencies component,
be said electric current alien frequencies component.
4. like the method for testing of the transimpedance of claim 1 or 2 or 3 described parallel transmission lines of electricity, it is characterized in that the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.
5. like the method for testing of the transimpedance of claim 1 or 2 or 3 described parallel transmission lines of electricity, it is characterized in that, adopt said method of testing to test said phase measurement circuit and be no less than 10 times with the said number of times of the transimpedance between the working line mutually.
6. the method for testing of the coupling capacitance of a parallel transmission line of electricity is characterized in that, said parallel transmission line of electricity comprises measurement circuit and working line, and the method for testing of the coupling capacitance of said parallel transmission line of electricity comprises the steps:
The head end of the phase measurement circuit in the said measurement circuit is inserted alien frequencies trial voltage, the terminal open circuit of said phase measurement circuit;
Test head end voltage, head end electric current, end current and the frequency of said phase measurement circuit, and calculate voltage power frequency component and electric current power frequency component;
Test head end voltage, head end electric current and the frequency of the phase working line in the said working line, and calculate voltage alien frequencies component and electric current alien frequencies component;
Calculate said phase measurement circuit and said coupling capacitance between the working line mutually according to said electric current alien frequencies component and voltage alien frequencies component.
7. the method for testing of the coupling capacitance of parallel transmission line of electricity as claimed in claim 6 is characterized in that, said parallel transmission line of electricity is a double-circuit line, said phase measurement circuit and said coupling capacitance between the working line mutually
Wherein,
Be the voltage power frequency component,
Be electric current power frequency component, f
1Be the alien frequencies frequency,
Be voltage alien frequencies component,
Be electric current alien frequencies component, f
2Be work frequency.
8. the method for testing of the coupling capacitance of parallel transmission line of electricity as claimed in claim 6 is characterized in that, said parallel transmission line of electricity is many loop lines road, said phase measurement circuit and said coupling capacitance between the working line mutually
Wherein,
Be voltage alien frequencies component,
Be electric current alien frequencies component, f
2Be work frequency.
9. like the method for testing of the coupling capacitance of claim 6 or 7 or 8 described parallel transmission lines of electricity, it is characterized in that the SF of said method of testing is f
s, then
Wherein, f
1Be alien frequencies frequency, f
2Be work frequency, N is a sampling length.
10. like the method for testing of the coupling capacitance of claim 6 or 7 or 8 described parallel transmission lines of electricity, it is characterized in that the frequency range of said alien frequencies trial voltage is that 47.5Hz is to 52.5Hz.
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| CN201610099383.1A CN105699782B (en) | 2011-02-01 | 2011-02-01 | The test method of the mutual impedance of transmission lines in parallel |
| CN201110034423.1A CN102621389B (en) | 2011-02-01 | 2011-02-01 | The method of testing of the coupling capacitance of transmission lines in parallel |
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| CN201110034423.1A CN102621389B (en) | 2011-02-01 | 2011-02-01 | The method of testing of the coupling capacitance of transmission lines in parallel |
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Cited By (4)
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| CN103713198A (en) * | 2014-01-08 | 2014-04-09 | 国家电网公司 | Method for measuring phase to phase mutual impedance of long-distance extra-high voltage common-tower double-circuit transmission line |
| CN104820133A (en) * | 2015-04-14 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | Online measurement method for impedance parameter of three-phase asymmetric power transmission line |
| CN103713198B (en) * | 2014-01-08 | 2016-11-30 | 国家电网公司 | A kind of distance extra-high voltage same tower double circuit transmission line of electricity mutual impedance measuring method |
| CN108181513A (en) * | 2018-03-15 | 2018-06-19 | 广东电网有限责任公司惠州供电局 | A kind of arrester Coupling Between Phases capacitance test method and system based on alien frequencies method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713198A (en) * | 2014-01-08 | 2014-04-09 | 国家电网公司 | Method for measuring phase to phase mutual impedance of long-distance extra-high voltage common-tower double-circuit transmission line |
| CN103713198B (en) * | 2014-01-08 | 2016-11-30 | 国家电网公司 | A kind of distance extra-high voltage same tower double circuit transmission line of electricity mutual impedance measuring method |
| CN104820133A (en) * | 2015-04-14 | 2015-08-05 | 广东电网有限责任公司电力科学研究院 | Online measurement method for impedance parameter of three-phase asymmetric power transmission line |
| CN108181513A (en) * | 2018-03-15 | 2018-06-19 | 广东电网有限责任公司惠州供电局 | A kind of arrester Coupling Between Phases capacitance test method and system based on alien frequencies method |
| CN108181513B (en) * | 2018-03-15 | 2020-02-04 | 广东电网有限责任公司惠州供电局 | Inter-phase coupling capacitance testing method and system for lightning arrester based on pilot frequency method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102621389B (en) | 2016-04-20 |
| CN105699782B (en) | 2018-05-25 |
| CN105699782A (en) | 2016-06-22 |
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