CN104062502A - Phase examination method of high-voltage cable intersecting interconnection system - Google Patents
Phase examination method of high-voltage cable intersecting interconnection system Download PDFInfo
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- CN104062502A CN104062502A CN201410280054.8A CN201410280054A CN104062502A CN 104062502 A CN104062502 A CN 104062502A CN 201410280054 A CN201410280054 A CN 201410280054A CN 104062502 A CN104062502 A CN 104062502A
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Abstract
The invention discloses a phase examination method of a high-voltage cable intersecting interconnection system. The phase examination method comprises the steps that wire connection is conducted on the head section of a high-voltage cable by a detector; phase examination is conducted on the intersecting interconnection system from a first joint box of the high-voltage cable by the detector; phase examination is conducted on the intersecting interconnection system from a second joint box of the high-voltage cable by the detector; the steps are repeated until all the phase examination work of the intersecting interconnection system is completed. According to the phase examination method, an existing phase examination method for the high-voltage cable intersecting interconnection system is improved, and therefore the phase examination work can be rapidly and efficiently completed through a common universal meter and simple wire connection under the condition that no person is at the opposite end for cooperation.
Description
Technical field
The present invention relates to a kind of voltage-phase and measure device, relate in particular to the cross interconnected system phase inspection method of a kind of high-tension cable.
Background technology
High-voltage cross-linking polythene cable is due to its outstanding electric property, good heat resistance, and lay and annex is easy for installation and be not subject to the advantages such as drop restriction, consider the requirement of urban planning, the overhead transmission line of urban district and development area electrical network main grid structure is replaced by high-tension cable gradually simultaneously.
Because electric pressure is high, discharge capacity is large, high-voltage cross-linking polythene cable is single core cable.The conductor of single core cable and the relation of protective metal shell, just be equivalent to winding and the Secondary Winding of transformer, in the time that cable conductor flows through alternating current, can produce induced voltage, therefore current-carrying capacity and the safe and stable operation important of the connected mode of single core cable protective metal shell to high-tension cable at protective metal shell.
The cross interconnected system of high-tension cable, connects the protective metal shell of the high voltage single-core cable of long distance and the system that forms exactly according to certain rules, and the phase shift inspection of cross interconnected system is one of on-the-spot commissioning test project of high-tension cable.
Summary of the invention
The object of the present invention is to provide the cross interconnected system phase inspection method of a kind of high-tension cable, be intended to solve prior art in the time carrying out phase shift inspection, the problem such as inconvenience that must have technician to coordinate in opposite end to bring.The inventive method only needs respectively three-phase protective metal shell to be connected according to direct ground connection, resistance grounded and earth-free mode, and testing staff can complete phase shift inspection work at the other end.
Innovative point: the present invention only, by a common multimeter and simple wiring, can check the cross interconnected system of high-tension cable, without anyone cooperation
The present invention is achieved in that the cross interconnected system phase inspection method of a kind of high-tension cable comprises: step 1: testing staff carries out wiring first section of high-tension cable; Step 2: testing staff carries out phase shift inspection to No. 1 joint case of high-tension cable to cross interconnected system; Step 3: testing staff carries out phase shift inspection to No. 2 joint casees of high-tension cable to cross interconnected system; Step 4: repeat above step, until complete the phase shift inspection work of whole cross interconnected systems.
Described step 1: first, testing staff carries out wiring first section of high-tension cable.By a of protective metal shell direct ground connection mutually, the resistance eutral grounding by b through 100 ohm, c is mutually unsettled earth-free.
Described step 2: testing staff carries out phase shift inspection to No. 1 joint case of high-tension cable to cross interconnected system.No. 1 joint case place, can lead to respectively cross interconnected case by the protective metal shell of two sections of cables by concentric cable when cable splice construction, therefore has 6 phases, i.e. core 3 phase and outer core 3 phases in concentric cable.With resistance (ohm) shelves of multimeter, measure over the ground respectively the inside and outside core of concentric cable, what now resistance was zero is a phase of cable head, resistance be about 100 ohm for b phase, c phase resistance infinity, the resistance of all the other 3 phase cores (a1, b1, c1) is also infinitely great, and this 3 phase core points to No. 2 joint casees.Again by the a1 of protective metal shell direct ground connection mutually, the resistance eutral grounding by b1 through 100 ohm, c1 is mutually unsettled earth-free, for next step phase shift inspection work is prepared.
Described step 3: testing staff carries out phase shift inspection to No. 2 joint casees of high-tension cable to cross interconnected system.Repeat second step Detection of content, correct to determine a1, b1, the c1 phase place of No. 2 joint casees, and point to 1 good joint case.Again a2, b2, c2 phase protective metal shell are carried out to phase shift inspection and prepared, go to No. 3 joint casees to check.
Described step 4: repeat above step, until complete the phase shift inspection work of whole cross interconnected systems.
Cross interconnected system is that cable line is divided into some large section; every large section is divided into again three segments equal in length in principle; between every section, install isolating joint; between isolating joint place protective metal shell three-phase, carry out cross interconnected with concentric cable; isolating joint place installs one group of overvoltage protection device, each two ends protective metal shell of large section interconnected ground connection respectively.
The cross interconnected system phase inspection method of a kind of high-tension cable of the present invention, the present invention is by improving the cross interconnected system phase inspection method of high-tension cable in the past, can be the in the situation that of the unmanned cooperation in opposite end, only, by a common multimeter and simple wiring, complete fast, efficiently phase shift inspection work.
Brief description of the drawings
Fig. 1 is the cross interconnected system schematic of high-tension cable that the embodiment of the present invention provides;
Fig. 2 is that the concentric cable that the embodiment of the present invention provides is drawn figure;
Fig. 3 is the cross interconnected case physical cabling figure that the embodiment of the present invention provides;
Fig. 4 is the cross interconnected system phase inspection method of a kind of high-tension cable implementation method process flow diagram that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 4, the present invention is achieved in that the cross interconnected system phase inspection method of a kind of high-tension cable comprises: step S401: testing staff carries out wiring first section of high-tension cable; Step S402: testing staff carries out phase shift inspection to No. 1 joint case of high-tension cable to cross interconnected system; Step S403: testing staff carries out phase shift inspection to No. 2 joint casees of high-tension cable to cross interconnected system; Step S404: repeat above step, until complete the phase shift inspection work of whole cross interconnected systems.
As shown in Figure 1, cross interconnected system is mainly made up of multiple cross interconnected casees and wire;
Described step S401: first, testing staff carries out wiring first section of high-tension cable.By a of protective metal shell direct ground connection mutually, the resistance eutral grounding by b through 100 ohm, c is mutually unsettled earth-free.
Described step S402: testing staff carries out phase shift inspection to No. 1 joint case of high-tension cable to cross interconnected system.No. 1 joint case place, when cable splice construction, can the protective metal shell of two sections of cables be drawn respectively to (seeing Fig. 2) to cross interconnected case (seeing Fig. 3) by concentric cable, therefore have 6 phases, i.e. core 3 phases (Fig. 3 top) and outer core 3 phases (Fig. 3 bottom) in concentric cable.With resistance (ohm) shelves of multimeter, measure over the ground respectively the inside and outside core of concentric cable, what now resistance was zero is a phase of cable head, resistance be about 100 ohm for b phase, c phase resistance infinity, the resistance of all the other 3 phase cores (a1, b1, c1) is also infinitely great, and this 3 phase core points to No. 2 joint casees.Again by the a1 of protective metal shell direct ground connection mutually, the resistance eutral grounding by b1 through 100 ohm, c1 is mutually unsettled earth-free, for next step phase shift inspection work is prepared.
As shown in Figure 3, cross interconnected case is mainly by ground terminal, sheath protector, inlet wire port, outer core holder, interior core holder nut; Ground terminal is arranged on the upper right side of cross interconnected case; inlet wire port is arranged on the below of cross interconnected case; sheath protector is arranged on the left side of ground terminal, and interior core holder nut is arranged on sheath protector, and outer core holder is arranged on the top of inlet wire port.
Described step S403: testing staff carries out phase shift inspection to No. 2 joint casees of high-tension cable to cross interconnected system.Repeat second step Detection of content, correct to determine a1, b1, the c1 phase place of No. 2 joint casees, and point to 1 good joint case.Again a2, b2, c2 phase protective metal shell are carried out to phase shift inspection and prepared, go to No. 3 joint casees to check.
Described step S404: repeat above step, until complete the phase shift inspection work of whole cross interconnected systems.
Because electric pressure is high, discharge capacity is large, high-voltage cross-linking polythene cable is single core cable.
The conductor of single core cable and the relation of protective metal shell, be just equivalent to winding and the Secondary Winding of transformer.In the time that cable conductor flows through alternating current, a part of magnetic line of force and protective metal shell interlinkage that it around produces, can produce induced voltage at protective metal shell.The size of induced voltage is not only relevant with the electric current flowing through in cable or short-circuit current, simultaneously relevant with the length of cable line with the arrangement mode of cable.If cable metal sheath two-terminal-grounding makes it form close access, in protective metal shell, will produce circulation; When cable normally moves, the circulation on protective metal shell and the load current of wire are essentially the same order of magnitude, by producing very large circulation loss, make electric cable heating, affect the transmission capacity of cable.Therefore current-carrying capacity and the safe and stable operation important of the connected mode of single core cable protective metal shell to high-tension cable.
In order to reduce protective metal shell loss, improve the transmission capacity of cable, it is cross interconnected that in the time that Voltage Cable Lines Construction is longer, (more than 1km) can adopt protective metal shell.As shown in Figure 1; cross interconnected system is divided into cable line some large section exactly; every large section is divided into again three segments equal in length in principle; between every section, install isolating joint; between isolating joint place protective metal shell three-phase, carry out cross interconnected with concentric cable; isolating joint place installs one group of overvoltage protection device, each two ends protective metal shell of large section interconnected ground connection respectively.
The cross interconnected system of high-tension cable, connects the protective metal shell of the high voltage single-core cable of long distance and the system that forms exactly according to certain rules.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendments that performing creative labour can make or distortion still within protection scope of the present invention.
Claims (7)
1. the cross interconnected system phase inspection method of high-tension cable, is characterized in that, the cross interconnected system phase inspection method of this high-tension cable comprises:
Step 1: testing staff carries out wiring first section of high-tension cable;
Step 2: testing staff carries out phase shift inspection to No. 1 joint case of high-tension cable to cross interconnected system;
Step 3: testing staff carries out phase shift inspection to No. 2 joint casees of high-tension cable to cross interconnected system;
Step 4: repeat above step, until complete the phase shift inspection work of whole cross interconnected systems.
2. the cross interconnected system phase inspection method of high-tension cable according to claim 1, is characterized in that, in step 1, the means of high-tension cable being carried out to wiring is a direct ground connection mutually, the resistance eutral grounding by b through 100 ohm, and c is mutually unsettled earth-free.
3. the cross interconnected system phase inspection method of high-tension cable according to claim 1, it is characterized in that, in step 2, cable splice leads to respectively cross interconnected case by concentric cable by the protective metal shell of two sections of cables, measure over the ground respectively the inside and outside core resistance of concentric cable, determine a phase, b phase and c phase.
4. the cross interconnected system phase inspection method of high-tension cable according to claim 3, is characterized in that, cross interconnected case comprises: ground terminal, sheath protector, inlet wire port, outer core holder, interior core holder nut; Ground terminal is arranged on the upper right side of cross interconnected case; inlet wire port is arranged on the below of cross interconnected case; sheath protector is arranged on the left side of ground terminal, and interior core holder nut is arranged on sheath protector, and outer core holder is arranged on the top of inlet wire port.
5. the cross interconnected system phase inspection method of high-tension cable according to claim 1, is characterized in that, content in repeating step two in step 3 to guarantee determining that a1, b1, the c1 phase place of No. 2 joint casees are correct, and is pointed to 1 good joint case; Again a2, b2, c2 phase protective metal shell are carried out to phase shift inspection and prepared, go to No. 3 joint casees to check.
6. the cross interconnected system phase inspection method of high-tension cable according to claim 1, is characterized in that, repeats above step 1～step 3 in step 4, until complete the phase shift inspection work of whole cross interconnected systems.
7. the cross interconnected system phase inspection method of high-tension cable according to claim 1; it is characterized in that; cross interconnected system is that cable line is divided into some large section; every large section is divided into again three segments equal in length in principle; between every section, install isolating joint; between isolating joint place protective metal shell three-phase, carry out cross interconnectedly with concentric cable, isolating joint place installs one group of overvoltage protection device, each two ends protective metal shell of large section interconnected ground connection respectively.
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| CN108629131A (en) * | 2018-05-08 | 2018-10-09 | 广东电网有限责任公司 | The intelligent generation method and device of cross interconnected structure chart |
| CN115021172A (en) * | 2022-05-07 | 2022-09-06 | 国网江苏省电力有限公司常州供电分公司 | Cross interconnection box and cross interconnection system preventing wrong wiring |
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| CN115021172A (en) * | 2022-05-07 | 2022-09-06 | 国网江苏省电力有限公司常州供电分公司 | Cross interconnection box and cross interconnection system preventing wrong wiring |
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| CN104062502B (en) | 2017-11-17 |
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