CN103424628A - Method for measuring parallel grid line positive sequence impedance - Google Patents

Method for measuring parallel grid line positive sequence impedance Download PDF

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Publication number
CN103424628A
CN103424628A CN201310365446XA CN201310365446A CN103424628A CN 103424628 A CN103424628 A CN 103424628A CN 201310365446X A CN201310365446X A CN 201310365446XA CN 201310365446 A CN201310365446 A CN 201310365446A CN 103424628 A CN103424628 A CN 103424628A
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CN
China
Prior art keywords
parallel
positive sequence
mutual inductance
measurement
conducting wire
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Pending
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CN201310365446XA
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Chinese (zh)
Inventor
程倩
黄一超
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.)
SHANGHAI URBAN POWER SUPPLY DESIGN Co Ltd
State Grid Corp of China SGCC
State Grid Shanghai Electric Power Co Ltd
Original Assignee
SHANGHAI URBAN POWER SUPPLY DESIGN Co Ltd
State Grid Corp of China SGCC
State Grid Shanghai Electric Power Co Ltd
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Application filed by SHANGHAI URBAN POWER SUPPLY DESIGN Co Ltd, State Grid Corp of China SGCC, State Grid Shanghai Electric Power Co Ltd filed Critical SHANGHAI URBAN POWER SUPPLY DESIGN Co Ltd
Priority to CN201310365446XA priority Critical patent/CN103424628A/en
Publication of CN103424628A publication Critical patent/CN103424628A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a method for measuring parallel grid line positive sequence impedance. The parallel grid line positive sequence impedance is measured through two synchronized signal measuring devices and a mutual inductance measuring device; one end of one synchronized signal measuring device located at the head end of a parallel three-phase guide line is connected with the parallel three-phase guide line in a mutual inductance manner, and the other end of the synchronized signal measuring device is connected to the ground or connected with the parallel three-phase guide line in the mutual inductance manner through the mutual inductance measuring device; the other synchronized signal measuring device located at the tail end of the parallel three-phase guide line is connected with the parallel three-phase guide line in the mutual inductance manner. Compared with the prior art, the method has the advantages that induction interferences produced by test on single-line parameters and parameters between lines by the parallel lines are completely avoided, select range of the power frequency parameter testing method is wide, and the method is particularly adaptable to measuring long-distance parallel lines.

Description

Measure the method for parallel power network line positive sequence impedance
Technical field
The present invention relates to a kind of measuring method of positive sequence impedance, especially relate to a kind of method of measuring parallel power network line positive sequence impedance.
Background technology
Along with China's electric grid large area is applied with two (many) loop lines of tower road, and large-scale circuit corridor merger, more and more with the transmission line of electricity of parallel cabling in tower or same passway for transmitting electricity.Although the corridor of UHV transmission line and Electric Power Network Planning circuits at different levels is not yet all determined, according to current fixed part line route, extra-high voltage alternating current-direct current circuit and existing 500kV power network line are used same transmission of electricity corridor by inevitable, and the parallel construction of circuit will become a kind of trend.Particularly in developed area, AC/DC transmission line is more and more intensive, land resource is very rare, same electric pressure circuit, different electric pressure circuit, alternating current circuit and the DC line passway for transmitting electricity that exists together, even with tower, set up for many times, will be after the major way of transmission line construction.
In the transmission line of electricity operational process, wire is with certain voltage, and, by certain load current, around it, forms strong electromagnetic field, and the adjacent, parallel circuit, in this elect magnetic field, can produce induced voltage on it.If wire, by certain formation closed-loop path, path, as by between the earth or two ground wires, forming loop, has induction current and occurs, produce loss.Induced voltage, electric current can be divided into electromagnetic induction, electrostatic induction two parts, and electrostatic induction is mainly that live wire makes on insulated conductor and induces voltage by capacitive coupling because coupling capacitance between wire causes.
The power transmission line power frequency parameter generally comprises coupling capacitance and the mutual inductive impedance between direct current resistance, positive sequence impedance, capacitive coupling, positive sequence electric capacity, positive sequence electric capacity and many times transmission lines in parallels; these parameters be all carry out electric power system tide calculating, calculation of short-circuit current, relay protection setting calculate and select the work such as power system operation mode before must set up the indispensable parameter of electric power digital model, the calculating of these parameters is toward living more complicated and being difficult to accurately take into account various impacts.For this reason, on engineering, require newly setting up and improved power circuit power frequency parameter is carried out actual measurement.Along with the situation of power circuit wiring on the same tower and scissors crossing is more serious, cause the mutual induced voltage of transmission line of electricity to raise, this safety to tester and instrument has formed serious threat, has brought serious interference to the Measurement accuracy of circuit power frequency parameter.In circuit parameter testing real work, find, the interference voltage between transmission line of electricity have up to thousands of volts, and the interference voltage between same circuit three-phase conducting wire also differs greatly.And the ultra-high-tension power transmission line power frequency parameter necessary master data that is operation of power networks, the accuracy of these data is very crucial, directly has influence on the accuracy that analysis, calculating and the relay protection setting value of power system operation mode are calculated.
Therefore, be necessary in depth to study interactional mechanism between parallel circuit comprehensively, in conjunction with the Adaptability Analysis of existing method of testing, the special technical requirement to the parallel circuit parameter testing is proposed, for accuracy and the reliability of correct selected parameter method of testing and test provides foundation.
Summary of the invention
Purpose of the present invention is exactly that a kind of easy to operate, result method of parallel power network line positive sequence impedance accurately is provided in order to overcome the defect that above-mentioned prior art exists.
Purpose of the present invention can be achieved through the following technical solutions:
Measure the method for parallel power network line positive sequence impedance, the circuit structure of measurement comprises the three-phase conducting wire that is parallel to each other, the top joint test power supply of wire, and end interconnects,
Utilize synchronizing signal surveying instrument and measurement of mutual inductance device to carry out the measurement of parallel power network line positive sequence impedance, described synchronizing signal surveying instrument is provided with two, an end that is positioned at the synchronizing signal surveying instrument of parallel three-phase conducting wire head end connects with parallel three-phase conducting wire mutual inductance, other end ground connection or connect with parallel three-phase conducting wire mutual inductance through the measurement of mutual inductance device, the synchronizing signal surveying instrument that is positioned at parallel three-phase conducting wire end connects with parallel three-phase conducting wire mutual inductance
Single-phase experimental power supply, distributed power generation device and measurement of mutual inductance device carry out the zero sequence capacitance measurement, described measurement of mutual inductance device one end is connected respectively with three-phase conducting wire through three connection branch roads, other end ground connection, described single-phase experimental power supply via line is connected to one of them tie point place of described three connection branch roads, described distributed power generation device via line is connected on the circuit of earth terminal of described measurement of mutual inductance device, the distributed power generation device is connected with single-phase experimental power supply mutual inductance
During measurement, utilize the synchronizing signal surveying instrument that is positioned at parallel three-phase conducting wire head end to detect head end lead-in wire and tested line contacts place positive sequence voltage fundamental phasors and head end forward-order current fundamental phasors, the synchronizing signal surveying instrument that is positioned at the three-phase conducting wire end is measured end leads and tested line contacts place positive sequence voltage fundamental phasors, calculates parallel power network line positive sequence impedance:
Z 1 = U · 1 + - U · 2 + I · s + - 0.5 Y 1 U · 1 + ,
In formula: Z 1For positive sequence impedance; For head end lead-in wire and tested line contacts place positive sequence voltage fundamental phasors; For end leads and tested line contacts place positive sequence voltage fundamental phasors; Headed by rectify order current first harmonics phasor; Y 1For the positive sequence admittance.
Described measurement of mutual inductance device is current transformer or voltage transformer (VT).
Described three-phase conducting wire adopts the LGJ-630/45 wire of 4 divisions, and the division radius is 450mm.
Compared with prior art, the inductive disturbance that the present invention has avoided parallel circuit to form parameter testing between single line parameter and line fully, the range of choice of its power frequency parameter test method is wider, especially is applicable to the measurement of the parallel circuit of long distance.
The accompanying drawing explanation
Fig. 1 is the circuit structure diagram of test;
The equivalent circuit diagram of Fig. 2 test circuit.
In figure, 1 is that experiment power supply, 2 is that measurement of mutual inductance device, 3 is the synchronizing signal surveying instrument.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
Measure the method for parallel power network line positive sequence impedance, the circuit structure of measurement comprises the three-phase conducting wire that is parallel to each other, the top joint test power supply 1 of wire, and end interconnects, and the circuit structure of test is as shown in Figure 1.Utilize synchronizing signal surveying instrument 3 and measurement of mutual inductance device 2 to carry out the measurement of parallel power network line positive sequence impedance, synchronizing signal surveying instrument 3 is provided with two, an end that is positioned at the synchronizing signal surveying instrument 3 of parallel three-phase conducting wire head end connects with parallel three-phase conducting wire mutual inductance, other end ground connection or connect with parallel three-phase conducting wire mutual inductance through measurement of mutual inductance device 2, the measurement of mutual inductance device 2 used is current transformer or voltage transformer (VT), the synchronizing signal surveying instrument 2 that is positioned at parallel three-phase conducting wire end connects with parallel three-phase conducting wire mutual inductance
During measurement, utilize the synchronizing signal surveying instrument that is positioned at parallel three-phase conducting wire head end to detect head end lead-in wire and tested line contacts place positive sequence voltage fundamental phasors and head end forward-order current fundamental phasors, the synchronizing signal surveying instrument that is positioned at the three-phase conducting wire end is measured end leads and tested line contacts place positive sequence voltage fundamental phasors, calculates parallel power network line positive sequence impedance: Z 1 = U · 1 + - U · 2 + I · s + - 0.5 Y 1 U · 1 + ,
In formula: Z 1For positive sequence impedance; For head end lead-in wire and tested line contacts place positive sequence voltage fundamental phasors; For end leads and tested line contacts place positive sequence voltage fundamental phasors; Headed by rectify order current first harmonics phasor; Y 1For the positive sequence admittance.
Positive sequence impedance both-end synchro measure equivalent circuit as shown in Figure 2, can be described further the test of positive sequence impedance.In the computing formula of positive sequence impedance,
For test positive sequence voltage fundamental phasors; r SdResistance at the head end temperature during for the single-phase lead-in wire test of head end. r MdResistance while testing for the tested line wire of end to the single-phase lead-in wire of neutral point under terminal temperature; For end forward-order current fundamental phasors.

Claims (3)

1. measure the method for parallel power network line positive sequence impedance, the circuit structure of measurement comprises the three-phase conducting wire that is parallel to each other, the top joint test power supply of wire, and end interconnects,
It is characterized in that, utilize synchronizing signal surveying instrument and measurement of mutual inductance device to carry out the measurement of parallel power network line positive sequence impedance, described synchronizing signal surveying instrument is provided with two, an end that is positioned at the synchronizing signal surveying instrument of parallel three-phase conducting wire head end connects with parallel three-phase conducting wire mutual inductance, other end ground connection or connect with parallel three-phase conducting wire mutual inductance through the measurement of mutual inductance device, the synchronizing signal surveying instrument that is positioned at parallel three-phase conducting wire end connects with parallel three-phase conducting wire mutual inductance
Single-phase experimental power supply, distributed power generation device and measurement of mutual inductance device carry out the zero sequence capacitance measurement, described measurement of mutual inductance device one end is connected respectively with three-phase conducting wire through three connection branch roads, other end ground connection, described single-phase experimental power supply via line is connected to one of them tie point place of described three connection branch roads, described distributed power generation device via line is connected on the circuit of earth terminal of described measurement of mutual inductance device, the distributed power generation device is connected with single-phase experimental power supply mutual inductance
During measurement, utilize the synchronizing signal surveying instrument that is positioned at parallel three-phase conducting wire head end to detect head end lead-in wire and tested line contacts place positive sequence voltage fundamental phasors and head end forward-order current fundamental phasors, the synchronizing signal surveying instrument that is positioned at the three-phase conducting wire end is measured end leads and tested line contacts place positive sequence voltage fundamental phasors, calculates parallel power network line positive sequence impedance:
Z 1 = U · 1 + - U · 2 + I · s + - 0.5 Y 1 U · 1 + ,
In formula: Z 1For positive sequence impedance; For head end lead-in wire and tested line contacts place positive sequence voltage fundamental phasors; For end leads and tested line contacts place positive sequence voltage fundamental phasors; Headed by rectify order current first harmonics phasor; Y 1For the positive sequence admittance.
2. the method for the parallel power network line positive sequence impedance of measurement according to claim 1, is characterized in that, described measurement of mutual inductance device is current transformer or voltage transformer (VT).
3. the method for the parallel power network line positive sequence impedance of measurement according to claim 1, is characterized in that, described three-phase conducting wire adopts the LGJ-630/45 wire of 4 divisions, and the division radius is 450mm.
CN201310365446XA 2013-08-21 2013-08-21 Method for measuring parallel grid line positive sequence impedance Pending CN103424628A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103698609A (en) * 2014-01-13 2014-04-02 国家电网公司 Waveform logging method of power frequency parameter test for transmission line
CN105182080A (en) * 2015-09-09 2015-12-23 浙江大华技术股份有限公司 Cable impedance measuring device and method and network device
CN105242115A (en) * 2015-10-27 2016-01-13 国网安徽省电力公司检修公司 High-voltage transmission line impedance measuring circuit and measuring method
CN109738703A (en) * 2018-11-15 2019-05-10 湖南大学 High pressure wide-band impedance measuring device and its control method

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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
CN101419254A (en) * 2008-12-17 2009-04-29 河南电力试验研究院 Uhv transmission line parameter measuring systems and method
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US20120330582A1 (en) * 2009-09-30 2012-12-27 Schneider Electric Energy UK Ltd. Method of high impedance groundfault detection for differential protection of overhead transmission lines
CN102914697A (en) * 2012-10-30 2013-02-06 西安交通大学 Micro-grid harmonic impedance measuring method based on three-phase symmetrical square wave current injection
CN103094900A (en) * 2012-12-20 2013-05-08 河海大学 Distributed generation power distribution network three-phase load flow calculation method taking phase sequence mixing method into consideration

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Publication number Priority date Publication date Assignee Title
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
CN101419254A (en) * 2008-12-17 2009-04-29 河南电力试验研究院 Uhv transmission line parameter measuring systems and method
US20120330582A1 (en) * 2009-09-30 2012-12-27 Schneider Electric Energy UK Ltd. Method of high impedance groundfault detection for differential protection of overhead transmission lines
CN102129009A (en) * 2011-01-10 2011-07-20 武汉大学 Method for measuring positive sequence parameters of ultra-high voltage transmission line based on double end measuring information
CN102914697A (en) * 2012-10-30 2013-02-06 西安交通大学 Micro-grid harmonic impedance measuring method based on three-phase symmetrical square wave current injection
CN103094900A (en) * 2012-12-20 2013-05-08 河海大学 Distributed generation power distribution network three-phase load flow calculation method taking phase sequence mixing method into consideration

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103698609A (en) * 2014-01-13 2014-04-02 国家电网公司 Waveform logging method of power frequency parameter test for transmission line
CN105182080A (en) * 2015-09-09 2015-12-23 浙江大华技术股份有限公司 Cable impedance measuring device and method and network device
CN105182080B (en) * 2015-09-09 2018-01-12 浙江大华技术股份有限公司 A kind of apparatus and method and the network equipment for measuring netting twine impedance
CN105242115A (en) * 2015-10-27 2016-01-13 国网安徽省电力公司检修公司 High-voltage transmission line impedance measuring circuit and measuring method
CN109738703A (en) * 2018-11-15 2019-05-10 湖南大学 High pressure wide-band impedance measuring device and its control method

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