CN107271775B - electric power overhead line phase detection method - Google Patents
electric power overhead line phase detection method Download PDFInfo
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- CN107271775B CN107271775B CN201710472384.0A CN201710472384A CN107271775B CN 107271775 B CN107271775 B CN 107271775B CN 201710472384 A CN201710472384 A CN 201710472384A CN 107271775 B CN107271775 B CN 107271775B
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- 238000001514 detection method Methods 0.000 title description 13
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000007689 inspection Methods 0.000 claims description 15
- 239000004020 conductor Substances 0.000 claims description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 9
- 230000005611 electricity Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012850 discrimination method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
- G01R25/005—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller, or for passing one of the input signals as output signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a phase checking method of an overhead power line, which belongs to the field of power systems and solves the technical problems that operators face personal danger and operating instruments are easy to be broken down and damaged in a high-induction-potential environment in the line in the prior art.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a phase detection method for overhead power lines.
Background
The high-voltage transmission line is distributed in areas with complex terrain and variable climate conditions, faults are easy to occur, and line patrol and maintenance are difficult.
At the present stage, a universal meter or a phase detector is selected conventionally for checking the phase, and the phase detector is applied to phase verification and phase sequence verification of power lines and substations and has the functions of phase checking, phase sequence measurement, electricity verification and the like. The electromagnetic interference-free electromagnetic interference shielding device has strong interference resistance, meets the (EMC) standard requirement, and is suitable for various electromagnetic interference occasions. The measured high voltage phase signal is taken out by the collector and is directly transmitted out after being processed. The phase comparison is carried out by the receiver, and the result after the phase checking is qualitative.
The conventional checking method at present is that when the induced electricity is small, any phase at the end of the line is firstly grounded, then a megger or a universal meter is used for measuring the resistance to the ground, when the resistance value is detected to be small, the phase is the same as phase, otherwise, the phase is not the same as phase, when the induced electricity is large, at the power supply end of the line to be checked, any two phases are firstly disassembled, then the other end of the line to be checked is connected with phase voltage transformer, the operating voltage is added at the power supply end, when the opposite end voltage transformer secondarily detects the operating voltage, the phase is the same as phase, otherwise, the phase is not the same as phase.
From the above, the conventional inspection method adopts a megger or multimeter, and is complex to apply, and due to the parallel, staggered and crossing of the high-voltage transmission lines, induced voltage is formed on the tested line, and the induced voltage can cause definite damages to testers and test instruments, which is very dangerous and inconvenient in such an environment.
The prior art discloses overhead line phase inspection methods.
The document (phase inspection test method and attention of cable line, Ma Hua, etc., power and electric engineering, 2016, 6 th year) discloses a phase inspection method, which adopts a battery method to check the phase, pulls out the line grounding knife switches at two ends of the cable, fully discharges the cable, suspends the three phases at the opposite side, namely, at the end of the cable, the A phase is connected with the positive pole of a battery pack, the B phase is connected with the negative pole of the battery pack, at the other end of the cable, a direct current voltmeter is used to measure any two-phase core wire, when the direct current voltmeter is positive, the positive pole of the direct current voltmeter is the A phase, the negative pole is the B phase, and the rest phase is the C phase.
When the phase is checked by adopting an insulation resistance meter method, circuit grounding knife switches at two ends of the cable are pulled open, the cable is fully discharged, three phases on the opposite side are all suspended, a measuring wire is connected with an L end of the insulation resistance meter, another is connected with an insulation rod, and an E end of the insulation resistance meter is grounded, the opposite side personnel is informed to ground phases (taking A phase as an example) of the cable, the other two phases are opened, the testing personnel drives the insulation resistance meter, the insulation rod is respectively lapped with core wires of the three phases of the cable, the core wires when the insulation resistance is zero are taken as A phase, after the test is finished, the insulation rod is separated from the A phase of the cable, the insulation resistance meter is stopped, the cable is discharged and recorded, after the operation is finished, the opposite side testing personnel is informed to connect the grounding wire with another phase of the circuit, and.
As described above, the above method uses a voltmeter or an insulation resistance meter for measurement, the phase detection method is performed in an environment where a strong induced potential is formed, the detection personnel cannot get rid of dangerous operations, and the operating instrument has a danger of being broken down.
The patent document with the publication number of CN 103983853A discloses a phase checking method for high-voltage cable cross-interconnection systems, which comprises the steps of 1, connecting wires at the first section of a high-voltage cable by a detection person, 2, checking the phase of the cross-interconnection system by the detection person to a No. 1 connector box of the high-voltage cable, 3, checking the phase of the cross-interconnection system by the detection person to a No. 2 connector box of the high-voltage cable, and 4, repeating the steps until the phase checking work of all the cross-interconnection systems is completed.
Firstly, a tester connects the first section of the high-voltage cable. The phase a of the metal sheath is directly grounded, the phase b is grounded through a 100 ohm resistor, and the phase c is suspended and not grounded.
According to the technical scheme, when the detection is carried out, the resistance is grounded through the 100-ohm resistor, the resistance is measured through the universal meter, the measuring instrument works in the dangerous induced potential environment, the construction danger cannot be avoided by workers, and the technical problem of instrument breakdown still exists.
Disclosure of Invention
In order to ensure the safety of human bodies and testers, experience is summarized and repeated practice is carried out in actual work on site, and finally electric overhead line phase checking methods are found.
When the end of the power line is grounded, the capacitance of the high-voltage overhead line to the ground changes, and the alternating voltage of the power overhead line to the ground also changes.
As shown in figure 1, a main capacitor 1 and a voltage division capacitor 2 are connected in series, and the induction voltage of an overhead line is detected at the end of a line by a capacitance voltage division method, the other end ends of the line are respectively grounded, when the voltage drop is detected, the phase is the same as that of overhead lines, and when the detected voltage is not changed, the phase is different from that of overhead lines.
The invention has the beneficial effects that:
1. in order to overcome the problems, safe, efficient, simple and convenient and strong-practicability overhead line phase detection methods are groped out in long-term engineering practice, and the method utilizes capacitance partial pressure to measure voltage, and can quickly, accurately and safely finish work only by grounding and measuring whether the voltage changes;
2. the operation overvoltage in the power cut-off and power transmission process is avoided, and the safety and stability of the power system are guaranteed;
3. power is not required to be cut off or supplied through a line, so that the operation time is saved;
4. compared with conventional phase inspection, the method does not need the participation of more personnel in scheduling, operation and maintenance and detection, and saves labor.
Drawings
FIG. 1 is a connection diagram of a voltage detection device in an overhead power line inspection phase method;
fig. 2 is a schematic diagram of phase inspection of an electric overhead line.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention, however, it will be apparent to those skilled in the art that the present invention may be practiced without or more of these details.
The method is further illustrated with reference to the drawings.
As shown in FIG. 1, the high voltage detection device is mounted by first selecting a small-capacity high-voltage capacitor (1000 pF, 10 kV) as a main capacitor, using two large-capacity low-voltage capacitors (0.02. mu.F, 400V) as voltage dividing capacitors, and welding three capacitors in series from Master and slave=UIs divided into*10000/1000=100 UIs divided into。
Then, the capacitors connected in series are arranged in a PVC pipe, and the external leads of the capacitors are fixed by binding posts.
Referring to fig. 2, the use and discrimination method is as follows:
1. pulling the grounding knife switches at the two ends of the overhead line open, and suspending the overhead line;
2. the test worker firstly grounds the low-voltage electricity 5 side of the device at the top end of the overhead line 1 , and then laps the lead wire at the high-voltage capacitor 4 side of the device on any phase of the overhead line by using an insulating rod;
3. the indicated value of the voltage of the low-voltage capacitor of the device is detected and recorded, the telephone informs the opposite terminal circuit A that the ground is respectively grounded, the grounding operation can be carried out by connecting the insulation rod 2 with the flexible conductor 3, at the moment, if the indication of the voltmeter 6 is reduced, the phase of the two ends of the conductor is equal to that of the conductors, if the voltmeter is not changed, the phase of the two ends of the conductor is different from that of the conductors, and therefore, the phase checking work is completed, and the purpose of checking the phase is achieved.
The following test voltages are converted to line side voltages.
Example 1
TABLE 1
As can be seen from the above table, when the phase inspection method according to the present invention is used to perform inspection, and the above steps are sequentially performed on three phases, it can be seen that the test voltage drops to 21 v when the phase a is inspected, and therefore, the phase a is concluded, and the checking of the other two phases is obtained by the same principle.
Example 2
TABLE 2
As can be seen from the above table, when the phase inspection method of the present invention is used to perform inspection, and the above steps are sequentially performed on three phases, it can be seen that the test voltage drops to 6 v when the phase a is inspected, and therefore, the phase a is concluded, and the checking of the other two phases is obtained by the same principle.
Example 3
TABLE 3
As can be seen from the above table, when the phase inspection method according to the present invention is used to perform inspection, and the above steps are sequentially performed on three phases, it can be seen that the test voltage drops to 12 v when the phase a is inspected, and therefore, the phase a is concluded, and the checking of the other two phases is obtained by the same principle.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (1)
1, electric power overhead line phase position inspection method, characterized by, including:
step , measuring the voltage at the end of the overhead line ;
grounding the other end of the overhead line, observing whether the voltage drops, if so, judging the overhead line to be in-phase, and if not, judging the overhead line to be out-of-phase;
the method comprises the following steps of , selecting a low-capacity high-voltage capacitor as a main capacitor, using a high-capacity low-voltage capacitor as a voltage dividing capacitor, and welding the capacitors in series;
in step , the earthing knife switch at the two ends of the overhead line is pulled open, the overhead line is suspended, the low-voltage capacitor side is earthed at the end of the overhead line, then the lead wire at the high-voltage capacitor side is lapped on any phase of the overhead line by an insulating rod, and the indicated value of the voltage is recorded;
in the second step, the other ends of the overhead line are grounded respectively, and are connected with the flexible conductor through the insulating rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710472384.0A CN107271775B (en) | 2017-06-21 | 2017-06-21 | electric power overhead line phase detection method |
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| CN201710472384.0A CN107271775B (en) | 2017-06-21 | 2017-06-21 | electric power overhead line phase detection method |
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| CN107271775B true CN107271775B (en) | 2020-01-31 |
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| CN111983522B (en) * | 2020-08-26 | 2023-01-06 | 广东韶钢松山股份有限公司 | Cable detection method |
| CN113162040B (en) * | 2021-04-29 | 2023-06-20 | 西安热工研究院有限公司 | System and method for power supply non-voltage nuclear phase for high-voltage plant of power plant |
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| CN101644730B (en) * | 2009-08-25 | 2012-04-25 | 广东电网公司广州供电局 | Circuit nuclear-phase method |
| CN102323492A (en) * | 2011-08-06 | 2012-01-18 | 安徽省电力公司芜湖供电公司 | Remote phasing device for cable lines and phasing method thereof |
| CN203232147U (en) * | 2013-05-02 | 2013-10-09 | 国家电网公司 | Voltage phase calibrating device for transformer partial discharge tests |
| CN104267231A (en) * | 2014-09-01 | 2015-01-07 | 珠海许继电气有限公司 | Miniature voltage energy obtaining device arranged in switchgear |
| CN104849574A (en) * | 2015-03-26 | 2015-08-19 | 国家电网公司 | Anti-induction electric phase sequence checking device for power transmission line |
| CN105067883B (en) * | 2015-07-31 | 2019-02-15 | 广东电网有限责任公司电力科学研究院 | The Intruding wave Time-Frequency Analysis Method and system of transformer equipment |
| CN106526288A (en) * | 2016-12-26 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Transmission line voltage and current monitoring system and method |
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