CN103424632A - Method for measuring parallel grid line zero-sequence capacitance - Google Patents
Method for measuring parallel grid line zero-sequence capacitance Download PDFInfo
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- CN103424632A CN103424632A CN2013103654559A CN201310365455A CN103424632A CN 103424632 A CN103424632 A CN 103424632A CN 2013103654559 A CN2013103654559 A CN 2013103654559A CN 201310365455 A CN201310365455 A CN 201310365455A CN 103424632 A CN103424632 A CN 103424632A
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Abstract
The invention relates to a method for measuring parallel grid line zero-sequence capacitance. The zero-sequence capacitance is measured through a single-phase power, a distributed power generator and a mutual inductance measuring device, one end of the mutual inductance measuring device is connected with three-phase guide lines through three connecting branch lines, and the other end of the mutual inductance measuring device is connected to the ground; the single-phase power is connected at one connecting point of the three connecting branch lines through a line, and the distributed power generator is connected to a line connected to the grounding end of the mutual inductance measuring device through a line and is connected with the single-phase power. Compared with the prior art, the method is convenient to use and easy to measure, by means of test, the adjacent parallel lines are on different grounding conditions, measuring results of the zero-sequence capacitance are consistent, so that the measuring results are accurate.
Description
Technical field
The present invention relates to a kind of capacitance measurement method, especially relate to a kind of method of measuring parallel power network line zero sequence electric capacity.
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 to provide a kind of measurement effect measuring method of parallel power network line zero sequence electric capacity accurately 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 zero sequence electric capacity, the circuit structure of measurement comprises the three-phase conducting wire that the two ends that are parallel to each other are unsettled, and top and the end of wire arrange earthing switch blade,
Utilize single-phase experimental power supply, distributed power generation device and measurement of mutual inductance device to 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
First the earthing switch blade of three-phase conducting wire end is opened during measurement, made the three-phase conducting wire insulation against ground;
Three-phase conducting wire top earthing switch blade is opened respectively, and by order phase experimental power supply after the three-phase short circuit, the centre-point earth of power supply, measure electric current, voltage and the power of each phase by the measurement of mutual inductance device;
Average according to the electric current recorded, voltage and power, calculate parallel power network line zero sequence electric capacity.
Described measurement of mutual inductance device is current transformer or voltage transformer (VT).
The electric current of each phase measured comprises that the wire two ends are unsettled, reaches single-end earthed the electric current of two-terminal-grounding.
The line voltage of the three-phase measured comprises that the wire two ends are unsettled, reaches single-end earthed the voltage of two-terminal-grounding.
The three phases active power measured comprises that the wire two ends are unsettled, reaches single-end earthed the active power of two-terminal-grounding.
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 present invention is easy to use, test is simple, and by detecting, adjacent parallel line is under different ground connection situations, and the measurement result of zero sequence electric capacity is all consistent.The ground connection situation of parallel line is for the not impact of measurement of the zero sequence electric capacity of circuit to be measured.
The accompanying drawing explanation
Fig. 1 is the circuit structure diagram of test.
In figure, 1 is that single-phase experimental power supply, 2 is that measurement of mutual inductance device, 3 is the distributed power generation device.
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 zero sequence electric capacity, its circuit structure as shown in Figure 1, this circuit structure comprises three-phase conducting wire A, B, the C be parallel to each other, and the single-phase experimental power supply 1 be connected with three-phase conducting wire through connecting circuit and measurement of mutual inductance device 2 also comprise distributed power generation device 3 in addition.This method is to utilize single-phase experimental power supply 1, distributed power generation device 3 and measurement of mutual inductance device 2 to carry out the zero sequence capacitance measurement, at first carry out connection, measurement of mutual inductance device 2 one ends are connected respectively with three-phase conducting wire through three connection branch roads, other end ground connection, single-phase experimental power supply 1 via line is connected to one of them tie point place of described three connection branch roads, distributed power generation device 3 via line are connected on the circuit of earth terminal of described measurement of mutual inductance device, in addition, distributed power generation device 3 also is connected with single-phase experimental power supply 1 mutual inductance.
Three-phase conducting wire adopts the LGJ-630/45 wire of 4 divisions, and the division radius is 450mm.In the present embodiment, the two ends of three-phase conducting wire A, B, C are unsettled, and in addition, all right end of three-phase conducting wire is unsettled, other end ground connection, or adopt two-terminal-grounding.
First the earthing switch blade of three-phase conducting wire end is opened during measurement, made the three-phase conducting wire insulation against ground;
Three-phase conducting wire top earthing switch blade is opened respectively, and by order phase experimental power supply 1 after the three-phase short circuit, the centre-point earth of power supply, measure electric current, voltage and the power of each phase by the measurement of mutual inductance device;
Average according to the electric current recorded, voltage and power, calculate parallel power network line zero sequence electric capacity.
The measurement of mutual inductance device 2 used in the present invention can be current transformer or voltage transformer (VT), and three-phase conducting wire adopts the LGJ-630/45 wire of 4 divisions, and the division radius is 450mm.The electric current of each phase measured comprises that the wire two ends are unsettled, reaches single-end earthed the electric current of two-terminal-grounding; The line voltage of the three-phase measured comprises that the wire two ends are unsettled, reaches single-end earthed the voltage of two-terminal-grounding; The three phases active power measured comprises that the wire two ends are unsettled, reaches single-end earthed the active power of two-terminal-grounding.The result that test obtains is as shown in the table.
Table 1
| The adjacent line earthing mode | y 0/(S/km) | g 0/(S/km) | b 0/(S/km) | C 0/(μF/km) |
| Two ends are unsettled | 2.439×10 -6 | 2.294×10 -8 | 2.439×10 -6 | 7.764×1 0-3 |
| Single-end earthed | 2.532×10 -6 | 2.780×10 -8 | 2.532×10 -6 | 8.059×10 -3 |
| Two-terminal-grounding | 2.525×10 -6 | 1.676×10 -8 | 2.525×10 -6 | 8.037×10 -3 |
Claims (6)
1. measure the method for parallel power network line zero sequence electric capacity, the circuit structure of measurement comprises the three-phase conducting wire that the two ends that are parallel to each other are unsettled, and top and the end of wire arrange earthing switch blade,
It is characterized in that, utilize single-phase experimental power supply, distributed power generation device and measurement of mutual inductance device to 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
First the earthing switch blade of three-phase conducting wire end is opened during measurement, made the three-phase conducting wire insulation against ground;
Three-phase conducting wire top earthing switch blade is opened respectively, and by order phase experimental power supply after the three-phase short circuit, the centre-point earth of power supply, measure electric current, voltage and the power of each phase by the measurement of mutual inductance device;
Average according to the electric current recorded, voltage and power, calculate parallel power network line zero sequence electric capacity.
2. the method for the parallel power network line zero sequence of measurement according to claim 1 electric capacity, 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 zero sequence of measurement according to claim 1 electric capacity, is characterized in that, the electric current of each phase measured comprises that the wire two ends are unsettled, reaches single-end earthed the electric current of two-terminal-grounding.
4. the method for the parallel power network line zero sequence of measurement according to claim 1 electric capacity, is characterized in that, the line voltage of the three-phase measured comprises that the wire two ends are unsettled, reaches single-end earthed the voltage of two-terminal-grounding.
5. the method for the parallel power network line zero sequence of measurement according to claim 1 electric capacity, is characterized in that, the three phases active power measured comprises that the wire two ends are unsettled, reaches single-end earthed the active power of two-terminal-grounding.
6. the method for the parallel power network line zero sequence of measurement according to claim 1 electric capacity, is characterized in that, described three-phase conducting wire adopts the LGJ-630/45 wire of 4 divisions, and the division radius is 450mm.
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| CN2519286Y (en) * | 2001-12-20 | 2002-10-30 | 武汉大学 | Device for on line measuring distribution net zero sequence capacity valve |
| 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 |
| WO2009081215A2 (en) * | 2007-12-21 | 2009-07-02 | Dan Andras | Equipment and procedure to determine fault location and fault resistance during phase to ground faults on a live network |
| CN102323487A (en) * | 2011-05-30 | 2012-01-18 | 武汉大学 | Anti-jamming measuring method for power transmission line zero-sequence capacitance based on harmonic component |
| CN102830287A (en) * | 2012-09-13 | 2012-12-19 | 安徽省电力公司淮南供电公司 | Circuit power frequency parameter measuring device capable of eliminating power frequency interference |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2519286Y (en) * | 2001-12-20 | 2002-10-30 | 武汉大学 | Device for on line measuring distribution net zero sequence capacity valve |
| WO2009081215A2 (en) * | 2007-12-21 | 2009-07-02 | Dan Andras | Equipment and procedure to determine fault location and fault resistance during phase to ground faults on a live network |
| 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 |
| CN102323487A (en) * | 2011-05-30 | 2012-01-18 | 武汉大学 | Anti-jamming measuring method for power transmission line zero-sequence capacitance based on harmonic component |
| CN102830287A (en) * | 2012-09-13 | 2012-12-19 | 安徽省电力公司淮南供电公司 | Circuit power frequency parameter measuring device capable of eliminating power frequency interference |
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| 汤峻: "基于干扰法的输电线路零序参数测量研究与应用", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》, no. 01, 15 January 2012 (2012-01-15), pages 6 - 7 * |
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