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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
phase
line
test
voltage
frequency component
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2011100344231A
Other languages
Chinese (zh)
Other versions
CN102621389B (en
Inventor
傅晨钊
黄华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
East China Power Test and Research Institute Co Ltd
Original Assignee
East China Power Test and Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by East China Power Test and Research Institute Co Ltd filed Critical East China Power Test and Research Institute Co Ltd
Priority to CN201610099383.1A priority Critical patent/CN105699782B/en
Priority to CN201110034423.1A priority patent/CN102621389B/en
Publication of CN102621389A publication Critical patent/CN102621389A/en
Application granted granted Critical
Publication of CN102621389B publication Critical patent/CN102621389B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

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

Method for testing mutual impedance and coupling capacitance of parallel transmission lines
Technical Field
The invention relates to a pilot frequency incremental method for coupling parameters of parallel transmission lines, in particular to a method for testing mutual impedance and coupling capacitance of the parallel transmission lines.
Background
The transmission line is an important component of the power system, and the line parameters of the transmission line need to be measured at the initial stage of line construction. Although these parameters will not change for a considerable period of time, the line parameters may change due to aging of the wires after long-term operation, changes in soil resistivity, or influences of weather, environment, geography and other factors. Therefore, the power dispatching department requires actually measuring the power frequency parameters of the transmission line. The power frequency parameters generally comprise direct current resistance, positive sequence impedance, interphase capacitance, positive sequence capacitance, zero sequence capacitance, and mutual impedance and coupling capacitance among multiple parallel transmission lines.
However, the parameter test of the parallel transmission lines, especially the coupling parameter test among multiple loops of parallel transmission lines, involves extremely wide power failure range and has strong interference, and the parameter test is almost impossible to implement in practical test. The accuracy of the parameters is crucial to the safe operation of the power grid, and therefore, a method capable of accurately testing the coupling parameters of the line under the condition that the relevant line is not powered off is needed.
Disclosure of Invention
The invention aims to provide a method for accurately testing the mutual impedance of parallel transmission lines under the condition that related lines are not powered off.
Another objective of the present invention is to provide a method for accurately testing the coupling capacitance of parallel transmission lines under the condition of no power outage of the relevant lines.
A mutual impedance test method of parallel transmission lines comprises a test line and an operation line, and comprises the following steps: connecting the head end of one phase of test circuit in the test circuits to pilot frequency test voltage, and grounding the tail end of the phase of test circuit; testing the head end voltage, the head end current and the tail end current of the phase test circuit, and calculating a voltage power frequency component and a current pilot frequency component; testing the head end voltage and head end current of one phase of the operation line, and calculating a voltage pilot frequency component and a current power frequency component; and calculating the mutual impedance between the phase test line and the phase operation line according to the current pilot frequency component and the voltage pilot frequency component.
In an embodiment of the present invention, the parallel transmission lines are double-circuit lines, and the mutual impedance between the phase test line and the phase operation line is equal to or greater than a predetermined value
Figure BDA0000046469260000021
Wherein,
Figure BDA0000046469260000022
is the power frequency component of the voltage,
Figure BDA0000046469260000023
for the said current pilot frequency component, the frequency of the pilot frequency component,
Figure BDA0000046469260000024
for the said voltage inter-frequency component,
Figure BDA0000046469260000025
is the current power frequency component.
In an embodiment of the present invention, the parallel transmission line is a multi-circuit line, and the mutual impedance between the phase test line and the phase operation line is a multiple-circuit line
Figure BDA0000046469260000026
Wherein,
Figure BDA0000046469260000027
for the said voltage inter-frequency component,
Figure BDA0000046469260000028
is the current pilot frequency component.
In a preferable technical solution of the transimpedance testing method, the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz.
In a preferred technical solution of the mutual impedance testing method, the number of times of testing the mutual impedance between the phase testing line and the phase running line by using the testing method is not less than 10 times.
A method for testing coupling capacitance of parallel transmission lines comprises a test line and an operation line, and comprises the following steps: connecting the head end of one phase of test circuit in the test circuits to pilot frequency test voltage, and opening the tail end of the phase of test circuit; testing the head end voltage, head end current, tail end current and frequency of the phase test circuit, and calculating a voltage power frequency component and a current power frequency component; testing the head end voltage, head end current and frequency of one phase of the operation lines, and calculating voltage pilot frequency components and current pilot frequency components; and calculating the coupling capacitance between the phase test line and the phase operation line according to the current pilot frequency component and the voltage pilot frequency component.
In an embodiment of the above-described coupling capacitance testing method, the parallel transmission lines are double-circuit lines, and the coupling capacitance between the phase testing line and the phase operating line is equal to or greater than a predetermined value
Figure BDA0000046469260000031
Wherein,
Figure BDA0000046469260000032
is a power frequency component of the voltage,
Figure BDA0000046469260000033
is a current power frequency component, f1In order to be the pilot frequency,
Figure BDA0000046469260000034
in order to be a voltage pilot frequency component,
Figure BDA0000046469260000035
is a current pilot frequency component, f2Is the power frequency.
In an embodiment of the above-described coupling capacitance testing method, the parallel transmission line is a multi-circuit line, and the coupling capacitance between the phase test line and the phase operating line is a coupling capacitance between the phase test line and the phase operating line
Figure BDA0000046469260000036
Wherein,
Figure BDA0000046469260000037
in order to be a voltage pilot frequency component,
Figure BDA0000046469260000038
is a current pilot frequency component, f2Is the power frequency.
The coupling capacitance test methodIn a preferred technical scheme, if the sampling frequency of the test method is fs, the test method is implemented
Figure BDA0000046469260000039
Wherein f is1Is the pilot frequency, f2The power frequency is N, and the sampling length is N.
In a preferable technical scheme of the coupling capacitance testing method, the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz.
The method for testing the mutual impedance and the coupling capacitance of the parallel transmission line can accurately test the mutual impedance and the coupling capacitance of the parallel transmission line under the condition that the running line is not powered off, and improves the detection efficiency and the detection accuracy.
Drawings
Fig. 1 is a schematic diagram of the testing principle of the mutual impedance of the parallel transmission lines of the present invention.
Fig. 2 is a flow chart of a testing method of the mutual impedance of the parallel transmission lines of the present invention.
Fig. 3 is a schematic diagram of the testing principle of the coupling capacitance of the parallel transmission line of the present invention.
Fig. 4 is a flowchart of a method for testing the coupling capacitance of the parallel transmission lines according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below by taking a double-circuit power transmission line as an example.
In the testing method, the parallel double-circuit power transmission line comprises a testing line and an operating line, wherein the testing line comprises an A-phase testing line, a B-phase testing line and a C-phase testing line, and the operating line comprises an A-phase operating line, a B-phase operating line and a C-phase operating line. The A-phase test circuit corresponds to the A-phase operation circuit, the B-phase test circuit corresponds to the B-phase operation circuit, and the C-phase test circuit corresponds to the C-phase operation circuit.
The following describes the method for testing the mutual impedance of parallel transmission lines in detail, taking the example of testing the mutual impedance between a B-phase test line and a B-phase operating line in a double-circuit transmission line. Referring to fig. 1, fig. 1 is a schematic diagram illustrating a testing principle of mutual impedance of parallel transmission lines according to the present invention. The head end of the B-phase test circuit is connected with pilot frequency test voltage Us, and the tail end of the B-phase test circuit is grounded. Preferably, the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz. The head end measuring device 11 is connected with the head end of the B-phase test circuit through a first voltage transformer 13 and a first current transformer 14, and is used for testing the head end voltage and the head end current of the B-phase test circuit. The head end measuring device 11 is further connected to the head end of the B-phase operating line through a second voltage transformer 15 and a second current transformer 16, and is used for testing the head end voltage and the head end current of the B-phase operating line. The end measuring device 12 is connected to the end of the B-phase operating line through a third current transformer 17, and is used for testing the end current of the B-phase operating line.
Referring to fig. 2, fig. 2 is a flowchart of a testing method of mutual impedance of parallel transmission lines according to the present invention. The invention relates to a method for testing mutual impedance of parallel transmission lines, which comprises the following steps:
and connecting the head end of the B-phase test circuit to pilot frequency test voltage, and grounding the tail end of the B-phase test circuit. Preferably, the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz.
Measuring the head end voltage, head end current and tail end current of the B-phase test circuit, and calculating the power frequency component of the voltage
Figure BDA0000046469260000051
With current pilot frequency component
Figure BDA0000046469260000052
Measuring the head end voltage and head end current of the B-phase operating line, and calculating the voltage pilot frequency component
Figure BDA0000046469260000053
With current power frequency component
Figure BDA0000046469260000054
Preferably, the head end and the tail end of the phase B test line and the phase B operation line are synchronously tested and recorded.
And (3) calculating the mutual impedance between the B-phase test line and the B-phase operation line according to the formula (1), and further converting to 50 Hz.
Figure BDA0000046469260000055
According to the test method, the mutual impedance between the A-phase test circuit and the A-phase operation circuit, the A-phase test circuit and the B-phase operation circuit, the A-phase test circuit and the C-phase operation circuit, the B-phase test circuit and the A-phase operation circuit, the B-phase test circuit and the C-phase operation circuit, the C-phase test circuit and the A-phase operation circuit, the C-phase test circuit and the B-phase operation circuit, and the C-phase test circuit and the C-phase operation circuit can be respectively tested by pressurizing and testing the corresponding test circuit changes.
The method for testing the mutual impedance of the parallel transmission lines is also suitable for the parallel multi-circuit transmission lines. When testing the mutual impedance among a plurality of power transmission lines, the testing method is used for testing according to the parallel combination. For parallel multi-circuit transmission lines, in order to further improve the accuracy of the test result, the mutual impedance between the test line and the corresponding operation line
Figure BDA0000046469260000061
Wherein,in order to operate the voltage pilot frequency component of the line,
Figure BDA0000046469260000063
to test the current pilot frequency component of the line.
Preferably, in the method for testing the mutual impedance of the parallel transmission lines, the testing times of the mutual impedance between each phase of the test line and the corresponding operating line are not less than 10, and an optimal value or an average value is selected from the testing times. Preferably, in the testing method of the present invention, a digital filter is selected. Sampling frequency f in the test method of the inventionsThe sampling time is selected to satisfy the requirement of the formula (3),
2 * f s N < | f 1 - f 2 | , - - - ( 3 )
wherein f is1Is the pilot frequency, f2The power frequency is N, and the sampling length is N.
The following describes the method for testing the coupling capacitance of the parallel transmission line in detail, taking the example of testing the coupling capacitance between the B-phase test line and the B-phase operating line in the double-circuit transmission line. Referring to fig. 3, fig. 3 is a schematic diagram illustrating a testing principle of a coupling capacitor of a parallel transmission line according to the present invention. The head end of the B-phase test circuit is connected with pilot frequency test voltage Us, and the tail end of the B-phase test circuit is open-circuited. Preferably, the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz. The head end measuring device 21 is connected with the head end of the B-phase test circuit through a first voltage transformer 23 and a first current transformer 24, and is used for testing the head end voltage and the head end current of the B-phase test circuit. The head end measuring device 21 is further connected to the head end of the B-phase operating line through a second voltage transformer 25 and a second current transformer 26, and is used for testing the head end voltage and the head end current of the B-phase operating line. The end measuring device 22 is connected to the end of the B-phase operating line through a third current transformer 27 for testing the end current of the B-phase operating line.
Referring to fig. 4, fig. 4 is a flowchart of a method for testing a coupling capacitance of a parallel transmission line according to the present invention. The method for testing the coupling capacitance of the parallel transmission line comprises the following steps:
and connecting the head end of the B-phase test circuit to pilot frequency test voltage, and opening the tail end of the B-phase test circuit. Preferably, the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz.
Measuring the head end voltage, head end current and tail end current of the B-phase test circuit, and calculating the power frequency component of the voltage
Figure BDA0000046469260000071
With current power frequency component
Figure BDA0000046469260000072
Measuring the head end voltage and head end current of the B-phase operating line, and calculating the voltage pilot frequency component
Figure BDA0000046469260000073
With current pilot frequency component
Figure BDA0000046469260000074
Preferably, the head end and the tail end of the phase B test line and the phase B operation line are synchronously tested and recorded.
And calculating the coupling capacitance between the B-phase test line and the B-phase running line according to a formula (4) and further converting the coupling capacitance to 50 Hz.
Figure BDA0000046469260000075
According to the test method, the coupling capacitance between the A-phase test circuit and the A-phase operation circuit, the A-phase test circuit and the B-phase operation circuit, the A-phase test circuit and the C-phase operation circuit, the B-phase test circuit and the A-phase operation circuit, the B-phase test circuit and the C-phase operation circuit, the C-phase test circuit and the A-phase operation circuit, the C-phase test circuit and the B-phase operation circuit, and the C-phase test circuit and the C-phase operation circuit can be respectively tested by pressurizing and testing the corresponding test circuit changes.
The method for testing the coupling capacitance of the parallel power transmission line is also suitable for the parallel multi-circuit power transmission line. When the coupling capacitance among the multi-circuit transmission lines is tested, the testing method is used for testing according to the parallel combination. For parallel multi-circuit transmission lines, in order to further improve the accuracy of the test result, the coupling capacitors between the test lines and the corresponding operating lines
Wherein,
Figure BDA0000046469260000077
in order to operate the voltage pilot frequency component of the line,is the current pilot frequency component of the operating line.
Preferably, in the method for testing the coupling capacitance of the parallel transmission line of the present invention, the number of times of testing the coupling capacitance between each phase of the test line and the corresponding operating line is not less than 10, and an optimal value or an average value is selected from the number of times of testing the coupling capacitance between each phase of the test line and the corresponding operating line. Preferably, in the testing method of the present invention, a digital filter is selected. Sampling frequency f in the test method of the inventionsThe sampling time is selected to satisfy the requirement of the formula (6),
2 * f s N < | f 1 - f 2 | , - - - ( 6 )
wherein f is1Is the pilot frequency, f2The power frequency is N, and the sampling length is N.
Compared with the prior art, the method for testing the mutual impedance and the coupling capacitance of the parallel transmission line can accurately test the mutual impedance and the coupling capacitance of the parallel transmission line under the condition that the running line is not powered off, and improves the detection efficiency and accuracy.
Many widely different embodiments may be made of the invention without departing from the spirit and scope thereof. It should be understood that the invention is not limited to the specific embodiments described in the specification, except as defined in the appended claims.

Claims (10)

1. A mutual impedance test method of parallel transmission lines is characterized in that the parallel transmission lines comprise test lines and operation lines, and the mutual impedance test method of the parallel transmission lines comprises the following steps:
connecting the head end of one phase of test circuit in the test circuits to pilot frequency test voltage, and grounding the tail end of the phase of test circuit;
testing the head end voltage, the head end current and the tail end current of the phase test circuit, and calculating a voltage power frequency component and a current pilot frequency component;
testing the head end voltage and head end current of one phase of the operation line, and calculating a voltage pilot frequency component and a current power frequency component;
and calculating the mutual impedance between the phase test line and the phase operation line according to the current pilot frequency component and the voltage pilot frequency component.
2. The method of claim 1, wherein the parallel transmission lines are double-circuit lines, and the mutual impedance between the phase test line and the phase operating line is a mutual impedance between the phase test line and the phase operating lineWherein,
Figure FDA0000046469250000012
is the power frequency component of the voltage,
Figure FDA0000046469250000013
for the said current pilot frequency component, the frequency of the pilot frequency component,
Figure FDA0000046469250000014
for the said voltage inter-frequency component,
Figure FDA0000046469250000015
is the current power frequency component.
3. The method of claim 1, wherein the parallel transmission lines are multi-loop lines, and the mutual impedance between the phase test line and the phase operational line is a mutual impedance between the phase test line and the phase operational line
Figure FDA0000046469250000016
Wherein,
Figure FDA0000046469250000017
for the said voltage inter-frequency component,
Figure FDA0000046469250000018
is the current pilot frequency component.
4. A method of testing the mutual impedance of parallel transmission lines as claimed in claim 1, 2 or 3, characterised in that the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz.
5. A method of testing the mutual impedance of parallel transmission lines as claimed in claim 1, 2 or 3, wherein the number of times the mutual impedance between the phase test line and the phase run line is tested using the test method is not less than 10.
6. The method for testing the coupling capacitance of the parallel transmission line is characterized by comprising a test line and an operation line, and comprises the following steps:
connecting the head end of one phase of test circuit in the test circuits to pilot frequency test voltage, and opening the tail end of the phase of test circuit;
testing the head end voltage, head end current, tail end current and frequency of the phase test circuit, and calculating a voltage power frequency component and a current power frequency component;
testing the head end voltage, head end current and frequency of one phase of the operation lines, and calculating voltage pilot frequency components and current pilot frequency components;
and calculating the coupling capacitance between the phase test line and the phase operation line according to the current pilot frequency component and the voltage pilot frequency component.
7. The method of claim 6, wherein the parallel transmission line is a double-circuit line, and the phase test line are connected in parallelCoupling capacitance between running lines
Figure FDA0000046469250000021
Wherein,
Figure FDA0000046469250000022
is a power frequency component of the voltage,is a current power frequency component, f1In order to be the pilot frequency,
Figure FDA0000046469250000024
in order to be a voltage pilot frequency component,
Figure FDA0000046469250000025
is a current pilot frequency component, f2Is the power frequency.
8. The method of claim 6, wherein the parallel transmission line is a multi-loop line, and the coupling capacitance between the phase test line and the phase operating line is the same as the coupling capacitance between the phase test line and the phase operating line
Figure FDA0000046469250000026
Wherein,
Figure FDA0000046469250000027
in order to be a voltage pilot frequency component,
Figure FDA0000046469250000028
is a current pilot frequency component, f2Is the power frequency.
9. The method for testing the coupling capacitance of the parallel transmission lines according to claim 6, 7 or 8, characterized in that the sampling frequency of the method is fsThen, then
Figure FDA0000046469250000031
Wherein f is1Is the pilot frequency, f2The power frequency is N, and the sampling length is N.
10. The method for testing the coupling capacitance of the parallel transmission lines according to claim 6, 7 or 8, wherein the frequency range of the pilot frequency test voltage is 47.5Hz to 52.5 Hz.
CN201110034423.1A 2011-02-01 2011-02-01 The method of testing of the coupling capacitance of transmission lines in parallel Active CN102621389B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
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

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110034423.1A CN102621389B (en) 2011-02-01 2011-02-01 The method of testing of the coupling capacitance of transmission lines in parallel

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CN201610099383.1A Division CN105699782B (en) 2011-02-01 2011-02-01 The test method of the mutual impedance of transmission lines in parallel

Publications (2)

Publication Number Publication Date
CN102621389A true CN102621389A (en) 2012-08-01
CN102621389B CN102621389B (en) 2016-04-20

Family

ID=46561421

Family Applications (2)

Application Number Title Priority Date Filing Date
CN201610099383.1A Active CN105699782B (en) 2011-02-01 2011-02-01 The test method of the mutual impedance of transmission lines in parallel
CN201110034423.1A Active CN102621389B (en) 2011-02-01 2011-02-01 The method of testing of the coupling capacitance of transmission lines in parallel

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN201610099383.1A Active CN105699782B (en) 2011-02-01 2011-02-01 The test method of the mutual impedance of transmission lines in parallel

Country Status (1)

Country Link
CN (2) CN105699782B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
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
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

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148087A (en) * 1977-04-20 1979-04-03 Phadke Arun G Distance relay for electric power transmission lines
JPS6298272A (en) * 1985-10-25 1987-05-07 Tokyo Electric Power Co Inc:The Fault point locating system for power transmission system
CN101034117A (en) * 2007-04-02 2007-09-12 武汉大学 Power transmission line power frequency parameters measuring method and device
CN101419253A (en) * 2008-12-17 2009-04-29 河南电力试验研究院 Uhv transmission line positive sequence and zero sequence parameter measurement method and system
CN101424715A (en) * 2008-12-05 2009-05-06 河南电力试验研究院 Power frequency parameter measuring set for high-pressure power transmission line
CN101696993A (en) * 2009-10-23 2010-04-21 武汉大学 Method for electrically measuring zero sequence impedance parameter by mutual induction line of pilot frequency injection current
CN101706533A (en) * 2009-11-10 2010-05-12 武汉大学 Method for measuring zero sequence impedance parameters of transmission lines by utilizing current of line ends
US20100171517A1 (en) * 2009-01-06 2010-07-08 Nec Electronics Corporation Impedance measurement method and impedance measurement device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4148087A (en) * 1977-04-20 1979-04-03 Phadke Arun G Distance relay for electric power transmission lines
JPS6298272A (en) * 1985-10-25 1987-05-07 Tokyo Electric Power Co Inc:The Fault point locating system for power transmission system
CN101034117A (en) * 2007-04-02 2007-09-12 武汉大学 Power transmission line power frequency parameters measuring method and device
CN101424715A (en) * 2008-12-05 2009-05-06 河南电力试验研究院 Power frequency parameter measuring set for high-pressure power transmission line
CN101419253A (en) * 2008-12-17 2009-04-29 河南电力试验研究院 Uhv transmission line positive sequence and zero sequence parameter measurement method and system
US20100171517A1 (en) * 2009-01-06 2010-07-08 Nec Electronics Corporation Impedance measurement method and impedance measurement device
CN101696993A (en) * 2009-10-23 2010-04-21 武汉大学 Method for electrically measuring zero sequence impedance parameter by mutual induction line of pilot frequency injection current
CN101706533A (en) * 2009-11-10 2010-05-12 武汉大学 Method for measuring zero sequence impedance parameters of transmission lines by utilizing current of line ends

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
王钢 等: "平行双回路输电线互阻抗的计算", 《河北电力技术》 *
胡志坚 等: "输电线路零序阻抗参数测量方法", 《电力科学与技术学报》 *
袁亮荣 等: "输电线路工频参数测试新方法的研究", 《广东电力》 *
马明 等: "基于异频法的架空输电线路工频参数测量与分析", 《电力学报》 *

Cited By (5)

* Cited by examiner, † Cited by third party
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
CN105699782A (en) 2016-06-22
CN105699782B (en) 2018-05-25

Similar Documents

Publication Publication Date Title
CN101551432B (en) Power distribution network fault positioning method
CN110320425B (en) A kind of Buck-like DC-DC converter output capacitor ESR monitoring method
CN105137292B (en) Direct current signal intelligent acquisition device for high-tension cable fault location
CN103399241B (en) Based on substation transformer fault diagnosis system and the method for temperature rise and load relation
CN104635094A (en) Method for improving PMU (power management unit) synchronous phasor measurement precision
CN104142421A (en) Substation equipment insulation online monitoring system and working method thereof
CN205374588U (en) Leakage current collection system
CN102854389A (en) Transformer winding deformation testing device
CN103427405B (en) The differential guard method of transmission line of electricity based on Higher Order Cumulants
CN103424627B (en) The method of double-end measurement parallel grid line zero-sequence impedance
CN104459330B (en) High-voltage transmission line zero-sequence impedance measuring circuit and method
CN102621389B (en) The method of testing of the coupling capacitance of transmission lines in parallel
CN202512161U (en) Super-grid over-voltage monitoring system based on Rogowski coil
RU112525U1 (en) AUTOMATED DIAGNOSTIC AND MONITORING SYSTEM OF POWER CABLE LINES INSULATION
CN201514470U (en) Switch power supply testing instrument
CN201622316U (en) Capacitive equipment current-leaking measuring device
CN104332984B (en) A kind of node voltage based on noise like influences each other the on-line identification method of the factor
CN110687406B (en) GIL equipment unit ultra-high frequency signal attenuation test platform and test method
CN107765084B (en) Universal voltage input power frequency signal frequency measurement system
CN205091423U (en) A DC signal intelligent acquisition device for high tension cable fault locating
CN106771491B (en) Zero-sequence voltage measurement method and device
CN102590762B (en) Fault Diagnosis Method of Switching Power Supply Based on Information Entropy Principle
CN104122455A (en) Transformer paper oil insulation frequency domain dielectric response testing device with shield drivers
CN103543353B (en) Direct current acquisition method under a kind of wide temperature environment
CN107340442A (en) A kind of power inverter common mode disturbances inhibition site assessment system and method

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant