CN112858821A - High-voltage overhead line short circuit test triggering device and method - Google Patents
High-voltage overhead line short circuit test triggering device and method Download PDFInfo
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- 239000002184 metal Substances 0.000 claims abstract description 78
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000006467 substitution reaction Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application discloses high-voltage overhead line short circuit test trigger device includes: remove end unmanned aerial vehicle, stiff end ground connection metal sheet, insulating lead wire and metal lead wire, remove end unmanned aerial vehicle below and connect in the one end of insulating lead wire, the other end of insulating lead wire is connected in the one end of metal lead wire, and the other end of metal lead wire is connected on stiff end ground connection metal sheet. The short circuit triggering process is controllable, the stability is greatly improved, and the problems that the flying track of a metal lead is uncertain and the probability of triggering failure in the traditional method using an ejection device are avoided; the flight track of the unmanned aerial vehicle is vertical and upward, arc flight control is not needed, and compared with the existing unmanned aerial vehicle flight control mode, the unmanned aerial vehicle flight control mode is simpler and has higher reliability; the short-circuit test trigger device under different voltage class lines and the layout size thereof are quantitatively specified, the operability is strong, and the situation that the parameters such as the length of a lead wire, the position of a grounding metal plate and the like can be determined only after field qualitative evaluation in the traditional method is avoided.
Description
Technical Field
The application relates to the technical field of high-voltage overhead line short-circuit test equipment, in particular to a high-voltage overhead line short-circuit test triggering device and method.
Background
The overhead line mainly refers to an overhead open line, is erected above the ground and is a power transmission line for transmitting electric energy by fixing a power transmission conductor on a tower erected on the ground through an insulator. The system is convenient to erect and maintain, has low cost, is easily influenced by weather and environment (such as strong wind, lightning stroke, dirt, ice and snow and the like) to cause faults, and simultaneously, the whole power transmission corridor occupies more land area and easily causes electromagnetic interference to the surrounding environment; the main components of the overhead line are: the cable comprises a conducting wire, a lightning conductor (overhead ground wire), a tower, an insulator, hardware fittings, a tower foundation, a stay wire, a grounding device and the like.
Before the ultra-high voltage transmission project is put into operation, the short-circuit protection system (comprising a relay protection device, a circuit breaker and a fault recording device) needs to be tested and checked. The checking method is that a single-phase grounding short-circuit fault is artificially manufactured directly at the outgoing line of a transformer substation or a converter station, and whether the response time and the logic sequence of each module of the protection system meet the requirements after the fault occurs is detected.
In order to produce artificial ground faults, metal cross-arms are usually suspended below the phase lines, which cross-arms make a reliable electrical connection to the phase lines and maintain a sufficient insulation distance from the ground. Then, an ejector is used for ejecting an arrow with the grounding wire to the cross arm, so that the grounding wire flies to the cross arm and causes short circuit. In order to ensure the safety of operators, the ejection distance is generally far, and due to the influence of a grounding wire connected to the tail, the arrow may deviate from a preset track in the process of flying. In field tests, it has occurred that the arrow has deviated from the trajectory, which is a dangerous cause of safety accidents.
Therefore, a device and a method for triggering a short circuit test of a high-voltage overhead line are needed.
Disclosure of Invention
The invention provides a high-voltage overhead line short circuit test trigger device, which is manufactured by adopting a multi-rotor unmanned aerial vehicle and solves the problem that the traditional ejection method is difficult to accurately trigger; meanwhile, key parameters and an operation method of the trigger device are determined, and the blank of triggering quantitative control of the short-circuit test is made up.
The embodiment of the application provides a high-voltage overhead line short circuit test trigger device, includes:
remove end unmanned aerial vehicle, stiff end ground connection metal sheet, insulating lead wire and metal lead wire, remove the end unmanned aerial vehicle below and connect in the one end of insulating lead wire, the other end of insulating lead wire is connected in the one end of metal lead wire, the other end of metal lead wire is connected on stiff end ground connection metal sheet, stiff end ground connection metal sheet is put subaerial flatly.
The embodiment of the application adopts the following technical scheme: remove end unmanned aerial vehicle and adopt many rotor unmanned aerial vehicle, and unmanned aerial vehicle load capacity is greater than 500g, and unmanned aerial vehicle takes RTK anti-electromagnetic interference function.
The embodiment of the application adopts the following technical scheme: remove end unmanned aerial vehicle and place inThe high-voltage metal cross arm is projected on the middle vertical line of the ground, and the distance from the projection is x at the other end of the projection opposite to the grounding metal plate1；
x1And U/(100kV/m) is not less than U, and U is the maximum value of the voltage relative to ground.
The embodiment of the application adopts the following technical scheme: said x1The value is U/(100kV/m) +0.5 m.
The embodiment of the application adopts the following technical scheme: the fixed end grounding metal plate has a projection distance of x2The height of the metal cross arm from the ground is y2Then the distance that the unmanned plane is predicted to fly up is y ═ y2·(1+x1/x2)。
The embodiment of the application adopts the following technical scheme: the insulated lead wire is a dry and light insulated wire, and the length L of the insulated lead wiresShould not be less than U/(100kV/m), U is the maximum value of the relative ground voltage, and the length of the insulated lead is Ls＝U/(100kV/m)+0.5m。
The embodiment of the application adopts the following technical scheme: the fixed end grounding metal plate is placed on a vertical line of the high-voltage metal cross arm in the ground projection.
The embodiment of the application adopts the following technical scheme: length L of the metal leadmShould not be less than √ (y)2+(x1+x2)2)-LsThe length of the metal lead is Lm＝(√(y2+(x1+x2)2)-Ls)+1m。
The embodiment of the application adopts the following technical scheme: the metal lead adopts thin copper wire, and the diameter is 0.4 mm.
The embodiment of the application also provides a method for triggering the high-voltage overhead line short circuit test, which comprises the following steps:
step one, calculating the distance x of the unmanned aerial vehicle distance projection according to the line voltage1Length L of insulated lead wires；
Step two, according to the height y of the metal cross arm from the ground2Distance x from unmanned aerial vehicle distance projection1Radical ofIn the formula y ═ y2·(1+x1/x2) Drawing y-x2The relationship curve of (1);
step three, projecting distance x according to distance of the unmanned aerial vehicle1Determining the flight-limiting height y of the unmanned aerial vehicle according to the field situationmax；
Step four, mixing ymaxSubstitution into y-x2In the relation curve of (1), x is obtained2Minimum value x2|min；
Step five, ordering x2＝1.2×x2|minSubstitution into y-x2Obtaining y from the relation curve of (A);
sixthly, calculating the length L of the metal leadm＝(√(y2+(x1+x2)2)-Ls)+1m；
Step seven, according to x1、x2Arranging unmanned aerial vehicle, grounding metal plate according to LsAnd LmPreparing an insulated lead and connecting the insulated lead with a metal lead;
step eight, setting the target height of the unmanned aerial vehicle as ymaxAnd after the test is started, the test platform flies upwards vertically, and a short circuit is triggered before the target height is reached.
The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:
(1) the short circuit triggering process is controllable, the stability is greatly improved, and the problems that the flying track of a metal lead is uncertain and the probability of triggering failure in the traditional method using an ejection device are avoided;
(2) the flight track of the unmanned aerial vehicle is vertical and upward, arc flight control is not needed, and compared with the existing unmanned aerial vehicle flight control mode, the unmanned aerial vehicle flight control mode is simpler and has higher reliability;
(3) the short-circuit test trigger device under different voltage class lines and the layout size thereof are quantitatively specified, the operability is strong, and the situation that the parameters such as the length of a lead wire, the position of a grounding metal plate and the like can be determined only after field qualitative evaluation in the traditional method is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a layout diagram of a high-voltage overhead line short-circuit test triggering device of the invention;
FIG. 2 is a dimensional diagram of the high voltage overhead line short circuit test triggering device of the invention;
FIG. 3 is a schematic view of the flight path and the trigger of the high-voltage overhead line short-circuit test trigger device of the invention;
fig. 4 is a flow chart of the operation of an embodiment of the present invention.
In the figure: (1) remove end unmanned aerial vehicle, (2) stiff end ground connection metal sheet, (3) insulating lead wire, (4) metal lead wire.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Examples
The utility model provides a high-voltage overhead line short circuit test trigger device, specifically is interchange 500kV overhead line short circuit test trigger device, includes:
as shown in fig. 1, remove end unmanned aerial vehicle 1, stiff end ground connection metal sheet 2, insulating lead wire 3 and metal lead wire 4, remove end unmanned aerial vehicle 1 below and connect in the one end of insulating lead wire 3, the other end of insulating lead wire 3 is connected in the one end of metal lead wire 4, the other end of metal lead wire 4 is connected on stiff end ground connection metal sheet 2, stiff end ground connection metal sheet 2 is kept flat subaerial.
Remove end unmanned aerial vehicle 1 and adopt many rotor unmanned aerial vehicle, and unmanned aerial vehicle load capacity is greater than 500g, and unmanned aerial vehicle takes RTK anti-electromagnetic interference function.
As shown in fig. 2 and 3, the mobile-end unmanned aerial vehicle 1 is placed on the perpendicular line of the ground projection of the high-voltage metal cross arm, and the distance from the projection is x at the other end of the projection opposite to the ground metal plate1；
In particular, x1Should not be less than 4.1 m, the actual value x1＝4.6m。
x1And U/(100kV/m) is not less than U, and U is the maximum value of the voltage relative to ground.
x1The value is U/(100kV/m) +0.5 m.
The fixed end grounding metal plate 2 has a projection distance of x2The height of the metal cross arm from the ground is y2Then the distance that the unmanned plane is predicted to fly up is y ═ y2·(1+x1/x2)。
The insulated lead 3 is made of dry and light insulated wire, and the length L of the insulated lead 3sShould not be less than U/(100kV/m), U is the maximum value of the relative ground voltage, and the length of the insulated lead is Ls＝U/(100kV/m)+0.5m。
The fixed end grounding metal plate 2 is placed on the vertical line of the high-voltage metal cross arm in the ground projection.
Length L of metal lead 4mShould not be less than √ (y)2+(x1+x2)2)-LsThe length of the metal lead is Lm＝(√(y2+(x1+x2)2)-Ls)+1m。
The metal lead 4 is a thin copper wire with a diameter of 0.4 mm.
Specifically, assume that the grounded metal plate is at a projection distance x from the ground metal plate23 m, the height of the metal cross arm from the ground is y28 meters, then the distance that unmanned aerial vehicle expects to fly up is y ═ y2·(1+x1/x2) 20.3 m.
The insulated lead wire is a dry and light insulated wire with a length LsShould not be less than 4.1 m, and the actual value Ls＝4.6m；
The metal lead adopts a thin copper wire, and the diameter of the thin copper wire is 0.4 mm;
length L of metal leadmShould not be less than 17.1 m, and the actual value Lm18.1 m.
As shown in fig. 4, an embodiment of the present application further provides a method for triggering a short-circuit test of a high-voltage overhead line, including the following steps:
step one, calculating the distance x of the unmanned aerial vehicle distance projection according to the line voltage1Length L of insulated lead wires(ii) a Obtaining the maximum value of the voltage to earth of the phase line to be about 410kV according to the line voltage of 500kV, and calculating the distance x of the unmanned aerial vehicle from the projection1Length L of insulated lead 4.6ms＝4.6m。
Step two, according to the height y of the metal cross arm from the ground2Distance x from unmanned aerial vehicle distance projection1Based on the formula y ═ y2·(1+x1/x2) Drawing y-x2The relationship curve of (1); the height of the metal cross arm from the ground is y2Distance x between 8 m and unmanned aerial vehicle distance projection1＝4.6m。
Step three, projecting distance x according to distance of the unmanned aerial vehicle1Determining the flight-limiting height y of the unmanned aerial vehicle according to the field situationmax(ii) a The fly height is assumed to be y in order to maintain a sufficient safety distance from the high voltage linemax15 meters.
Step four, mixing ymaxSubstitution into y-x2In the relation curve of (1), x is obtained2Minimum value x2|min；
Step five, ordering x2＝1.2×x2|minSubstitution into y-x2Obtaining y from the relation curve of (A); let x26.4 m, substituting y-x2The obtained y in the relation curve of (1) is 13.8 meters and is lower than the flight-limiting height, so that the requirement is met.
Sixthly, calculating the length L of the metal leadm＝(√(y2+(x1+x2)2)-Ls) +1 m; calculating the length L of the metal leadm14 meters.
Step seven, according to x1、x2Arranging unmanned aerial vehicle, grounding metal plate according to LsAnd LmPreparing an insulated lead and connecting the insulated lead with a metal lead;
step eight, setting the target height of the unmanned aerial vehicle as ymaxAfter the test is started, the test platform flies upwards vertically, and a short circuit is triggered before the test platform reaches the target height; unmanned aerial vehicle sets target height as ymaxAfter the test starts, the test flies vertically upwards, triggering a short circuit before reaching the target height.
In summary, the following steps: by the high-voltage overhead line short-circuit test triggering device and method, the short-circuit triggering process is controllable, the stability is greatly improved, and the problems that the flight path of a metal lead is uncertain and the probability of triggering failure in the traditional method using an ejection device are avoided; the flight track of the unmanned aerial vehicle is vertical and upward, arc flight control is not needed, and compared with the existing unmanned aerial vehicle flight control mode, the unmanned aerial vehicle flight control mode is simpler and has higher reliability; the short-circuit test trigger device under different voltage class lines and the layout size thereof are quantitatively specified, the operability is strong, and the situation that the parameters such as the length of a lead wire, the position of a grounding metal plate and the like can be determined only after field qualitative evaluation in the traditional method is avoided.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. The utility model provides a high-voltage overhead line short circuit test trigger device which characterized in that includes:
remove end unmanned aerial vehicle (1), stiff end ground connection metal sheet (2), insulating lead wire (3) and metal lead wire (4), remove end unmanned aerial vehicle (1) below and connect in the one end of insulating lead wire (3), the other end of insulating lead wire (3) is connected in the one end of metal lead wire (4), the other end of metal lead wire (4) is connected on stiff end ground connection metal sheet (2), stiff end ground connection metal sheet (2) keep flat subaerial.
2. The high-voltage overhead line short-circuit test trigger device according to claim 1, characterized in that: remove end unmanned aerial vehicle (1) and adopt many rotor unmanned aerial vehicle, and unmanned aerial vehicle load capacity is greater than 500g, and unmanned aerial vehicle takes RTK anti-electromagnetic interference function.
3. The high-voltage overhead line short-circuit test trigger device according to claim 1, characterized in that: remove end unmanned aerial vehicle (1) and place on high pressure metal cross arm is on the subaerial projection perpendicular line, at the other end of projection for ground connection metal sheet, apart from the projected distance for x1；
x1And U/(100kV/m) is not less than U, and U is the maximum value of the voltage relative to ground.
4. The high-voltage overhead line short-circuit test trigger device according to claim 3, characterized in that: said x1The value is U/(100kV/m) +0.5 m.
5. The high-voltage overhead line short-circuit test triggering device is characterized in that: the fixed end grounding metal plate (2) has a projection distance of x2The height of the metal cross arm from the ground is y2Then the distance that the unmanned plane is predicted to fly up is y ═ y2·(1+x1/x2)。
6. The high-voltage overhead line short-circuit test trigger device according to claim 1, wherein the trigger device is characterized in thatCharacterized in that: the insulated lead (3) adopts a dry and light insulated wire, and the length L of the insulated lead (3)sShould not be less than U/(100kV/m), U is the maximum value of the relative ground voltage, and the length of the insulated lead is Ls＝U/(100kV/m)+0.5m。
7. The high-voltage overhead line short-circuit test trigger device according to claim 1, characterized in that: the fixed end grounding metal plate (2) is placed on a vertical line of the high-voltage metal cross arm in the ground projection.
8. The high-voltage overhead line short-circuit test trigger device according to claim 1, characterized in that: the length L of the metal lead (4)mShould not be less than √ (y)2+(x1+x2)2)-LsThe length of the metal lead is Lm＝(√(y2+(x1+x2)2)-Ls)+1m。
9. The high-voltage overhead line short-circuit test trigger device according to claim 8, characterized in that: the metal lead (4) is a thin copper wire with the diameter of 0.4 mm.
10. The method for triggering the short-circuit test of the high-voltage overhead line according to claim 1 is characterized by comprising the following steps of:
step one, calculating the distance x of the unmanned aerial vehicle distance projection according to the line voltage1Length L of insulated lead wires；
Step two, according to the height y of the metal cross arm from the ground2Distance x from unmanned aerial vehicle distance projection1Based on the formula y ═ y2·(1+x1/x2) Drawing y-x2The relationship curve of (1);
step three, projecting distance x according to distance of the unmanned aerial vehicle1Determining the flight-limiting height y of the unmanned aerial vehicle according to the field situationmax；
Step four, mixing ymaxSubstitution into y-x2In the relation curve of (1), x is obtained2Minimum value x2|min；
Step five, ordering x2＝1.2×x2|minSubstitution into y-x2Obtaining y from the relation curve of (A);
sixthly, calculating the length L of the metal leadm＝(√(y2+(x1+x2)2)-Ls)+1m；
Step seven, according to x1、x2Arranging unmanned aerial vehicle, grounding metal plate according to LsAnd LmPreparing an insulated lead and connecting the insulated lead with a metal lead;
step eight, setting the target height of the unmanned aerial vehicle as ymaxAnd after the test is started, the test platform flies upwards vertically, and a short circuit is triggered before the target height is reached.
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Cited By (1)
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| 吕彬强;罗艺华;: "配网架空线路传统固定导线技术现状及设备研制", 低碳世界, no. 12, 25 December 2019 (2019-12-25) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022188384A1 (en) * | 2021-03-11 | 2022-09-15 | 南方电网科学研究院有限责任公司 | Ultra-high voltage line artificial short-circuit test method based on pulling by unmanned aerial vehicle |
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