CN103715629A - Method for entering high-voltage direct-current transmission line tangent tower equal potential - Google Patents

Method for entering high-voltage direct-current transmission line tangent tower equal potential Download PDF

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Publication number
CN103715629A
CN103715629A CN201310690478.7A CN201310690478A CN103715629A CN 103715629 A CN103715629 A CN 103715629A CN 201310690478 A CN201310690478 A CN 201310690478A CN 103715629 A CN103715629 A CN 103715629A
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CN
China
Prior art keywords
operating personnel
tangent tower
distance
transmission line
preset distance
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Pending
Application number
CN201310690478.7A
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Chinese (zh)
Inventor
李军
段鹏
郅啸
丁玉剑
孔繁云
刘荣
吴童生
田大鹏
闫建欣
白伟
路林
马乐
郭培恒
肖宾
赵隆乾
李志玮
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.)
MAINTENANCE COMPANY STATE GRID QINGHAI ELECTRIC POWER Co Ltd
State Grid Corp of China SGCC
State Grid Qinghai Electric Power Co Ltd
Original Assignee
MAINTENANCE COMPANY STATE GRID QINGHAI ELECTRIC POWER Co Ltd
State Grid Corp of China SGCC
State Grid Qinghai Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by MAINTENANCE COMPANY STATE GRID QINGHAI ELECTRIC POWER Co Ltd, State Grid Corp of China SGCC, State Grid Qinghai Electric Power Co Ltd filed Critical MAINTENANCE COMPANY STATE GRID QINGHAI ELECTRIC POWER Co Ltd
Priority to CN201310690478.7A priority Critical patent/CN103715629A/en
Publication of CN103715629A publication Critical patent/CN103715629A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a method for entering a high-voltage direct-current transmission line tangent tower equal potential. The method comprises the following steps: an operator arrives at a position parallel to a charged body of a high-voltage direct-current transmission line through a grounded tangent tower and is kept away from the charged body by a first predetermined distance; the operator leaves the tangent tower and approaches the charged body, wherein the sum of the distance between the tangent tower and the operator and the distance between the operator and the charged body is maintained as a second predetermined distance; and the operator arrives at the charged body and is kept away from the tangent tower by a third predetermined distance. By the adoption of the method of the invention, the problem that operators may suffer from an electric shock and be injured in high-voltage and high-altitude environments is solved and the personal safety of operators is ensured.

Description

Enter the method for HVDC (High Voltage Direct Current) transmission line tangent tower equal
Technical field
The present invention relates to safe practice field, in particular to a kind of method that enters HVDC (High Voltage Direct Current) transmission line tangent tower equal.
Background technology
Qinghai-Tibet DC networking project, from the east of Qaidam, Qinghai current conversion station (height above sea level is 2880m), to Lhasa current conversion station (height above sea level is 3850m), total track length 1038km, height above sea level is between 2880~5300m, and mean sea level is 4400m.Straight line pole is horizontal V-shaped insulator string structure, 4 bundle conductors.For this special circumstances by be defined as ± 400kV of its electric pressure.
Live line working is the necessary means that guarantees transmission line safe and stable operation, therefore, after Qinghai-Tibet DC transmission engineering puts into operation, also needs to carry out live line working work, and operating personnel, in the situation that circuit does not have a power failure, enters equipotential line facility is overhauled.Operating personnel, from shaft tower earth potential, enter the equipotential engineering of wire, if method is improper, the injury of getting an electric shock may occur.
For correlation technique operating personnel under high pressure, high altitude environment, can there is the problem of getting an electric shock and injuring, not yet propose at present effective solution.
Summary of the invention
The invention provides a kind of method that enters HVDC (High Voltage Direct Current) transmission line tangent tower equal, at least to solve in correlation technique under high pressure, high altitude environment operating personnel can occur the to get an electric shock problem of injury.
According to an aspect of the present invention, a kind of method that enters HVDC (High Voltage Direct Current) transmission line tangent tower equal is provided, comprise: operating personnel arrives at the position parallel with the electrified body of HVDC (High Voltage Direct Current) transmission line by the tangent tower of ground connection, and at least maintenance is the first preset distance with the distance of described electrified body; Described operating personnel leaves described tangent tower, close to described electrified body, and at least to keep described tangent tower to the distance sum of the electrified bodies such as described operating personnel's distance and described operating personnel be extremely described be the second preset distance; Described operating personnel arrives described electrified body, and at least maintenance is the 3rd preset distance with the distance of described tangent tower.
Preferably, described the first preset distance, the second preset distance and the 3rd preset distance are determined according to maximum working voltage and input operating range, wherein, described maximum working voltage and input operating range are to determine according to the height above sea level in the region of described tangent tower setting and atmospheric density.
Preferably, the tangent tower of described ground connection is in earth potential.
Preferably, described operating personnel is close to described electrified body by insulation delivery vehicle.
Preferably, the described insulation delivery vehicle current potential that mediates.
Preferably, described HVDC (High Voltage Direct Current) transmission line is ± 400kV DC power transmission line.
Preferably, described operating personnel dresses a complete set of shielding clothing.
By the present invention, adopt operating personnel to arrive at the position parallel with the electrified body of HVDC (High Voltage Direct Current) transmission line by the tangent tower of ground connection, and at least maintenance is the first preset distance with the distance of described electrified body; Described operating personnel leaves described tangent tower, close to described electrified body, and at least to keep described tangent tower to the distance sum of the electrified bodies such as described operating personnel's distance and described operating personnel be extremely described be the second preset distance; Described operating personnel arrives described electrified body, and at least maintenance is the mode of the 3rd preset distance with the distance of described tangent tower, solve operating personnel under high pressure, high altitude environment the problem of injury of getting an electric shock can occur, and then guaranteed operating personnel's personal safety.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic flow sheet that enters HVDC (High Voltage Direct Current) transmission line tangent tower equal method according to the embodiment of the present invention;
Fig. 2 is the structural representation of according to the preferred embodiment of the invention ± 400kV DC power transmission line tangent tower;
Fig. 3 is schematic diagram when operating personnel arrives at the position parallel with electrified body according to the preferred embodiment of the invention;
Fig. 4 is schematic diagram when operating personnel leaves tangent tower and approaches electrified body according to the preferred embodiment of the invention;
Fig. 5 is schematic diagram when operating personnel arrives electrified body according to the preferred embodiment of the invention.
Embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
It is a kind of that the embodiment of the present invention provides, and Fig. 1 is according to the schematic flow sheet of the method that enters HVDC (High Voltage Direct Current) transmission line tangent tower equal of the embodiment of the present invention, as shown in Figure 1, comprises following step:
Step S102: operating personnel arrives at the position parallel with the electrified body of HVDC (High Voltage Direct Current) transmission line by the tangent tower of ground connection, and at least maintenance is the first preset distance with the distance of electrified body.
Step S104: operating personnel leaves described tangent tower, close to electrified body, and at least keep tangent tower to operating personnel's distance and operating personnel to etc. the distance sum of electrified body be the second preset distance.
Step S106: operating personnel arrives electrified body, and at least maintenance is the 3rd preset distance with the distance of tangent tower.
In the present embodiment, by operating personnel from climbing tangent tower to arriving the process of electrified body, at least keeping operating personnel and electrified body is predetermined distance (the first preset distance, the second preset distance, the 3rd preset distance), guaranteed the personal safety of operating personnel in whole process, solve in correlation technique operating personnel under high pressure, the high altitude environment problem of injury of getting an electric shock can occur, and then guaranteed operating personnel's personal safety.
It should be noted that, in the above-described embodiments, the first preset distance, the second preset distance and the 3rd preset distance are determined according to maximum working voltage and input operating range, wherein, maximum working voltage and input operating range are to determine according to the height above sea level in the region of tangent tower setting and atmospheric density.Wherein, for example, impact due to high height above sea level and atmospheric density, make to exist on circuit with area, sea level portion with maximum working voltage and switching overvoltage, when the voltage of HVDC (High Voltage Direct Current) transmission line be ± during 400kV, its maximum working voltage is 412kV, and maximum switching overvoltage amplitude is 700kV.
In the above-described embodiments, operating personnel, climb tangent tower in the process of the parallel position of the electrified body with HVDC (High Voltage Direct Current) transmission line, the distance of operating personnel and electrified body at least remains in the situation of the first preset distance all the time, and operating personnel is among the environment in safety.
Wherein, the tangent tower of the ground connection of operating personnel's climbing is in earth potential, and operating personnel is also in earth potential.
Preferably, in the above-described embodiments, operating personnel, leave tangent tower, in the close process of electrified body, the distance that at least keeps operating personnel and electrified body is in the situation of the second preset distance, and operating personnel is among the environment in safety all the time.
Preferably, in the above-described embodiments, operating personnel is close to electrified body by insulation delivery vehicle.
Wherein, in by the insulation delivery vehicle process close to electrified body, operating personnel's current potential that mediates.
Preferably, when operating personnel arrives after electrified body, the distance that at least keeps operating personnel and tangent tower to keep is under the 3rd preset distance prerequisite, among the environment of operating personnel in safety.
Preferably, in the above-described embodiments, the HVDC (High Voltage Direct Current) transmission line of the electrified body that operating personnel reaches is ± 400kV DC power transmission line.
Preferably, in the above-described embodiments, in whole process, operating personnel dresses a complete set of shielding clothing.
It should be noted that, in the step shown in the flow chart of accompanying drawing, can in the computer system such as one group of computer executable instructions, carry out, and, although there is shown logical order in flow process, but in some cases, can carry out shown or described step with the order being different from herein.
In order to make technical scheme of the present invention and implementation method clearer, below in conjunction with preferred embodiment, its implementation procedure is described in detail.
The preferred embodiment of the present invention, provide a kind of and entered equipotential safety method at height above sea level 3000m area ± 400kV Qinghai-Tibet networking DC power transmission line tangent tower, the method enters live line working personnel in tangent tower equal process, to have very high fail safe in the DC networking project of Qinghai-Tibet.
Technical scheme of the present invention has adopted at ± 400kV Qinghai-Tibet networking DC power transmission line tangent tower and has entered equipotential safety method, the method comprises: first, operating personnel dresses a complete set of shielding clothing and from ground, steps on tower and arrive tower body and wire horizontal level, steps on that in tower process, at least to keep the distance of operating personnel and electrified body be the first preset distance; Secondly, operating personnel takes insulation delivery vehicle from tower body and enters high electric field, enters in process, and at least keeping the distance sum of earth electrode to operating personnel's distance and operating personnel to electrified body is the second preset distance; Finally, when operating personnel arrives electrified body place, at least keep operating personnel to the distance of earth electrode be the 3rd preset distance.
Pass through the preferred embodiment of the present invention, can make live line working personnel enter in the DC networking project of Qinghai-Tibet and in tangent tower equal process, there is very high fail safe, make live line working in the DC networking project of Qinghai-Tibet can be safely, carry out easily, improved the safe and stable operation level of transmission line.
Known according to a large amount of analog reslts that high elevation correction aspect is carried out, when live line working personnel are during in earth potential, while at least keeping the distance of the electrified bodies such as operating personnel and wire to be the first preset distance, its insulation withstand voltage is greater than system maximum operating voltage 412kV and the maximum switching overvoltage (700kV) of system; When live line working personnel mediate current potential, at least keep operating personnel to the distance of the earth electrodes such as steel tower, while being the second preset distance with operating personnel to the distance sum of the electrified bodies such as wire, its insulation withstand voltage is greater than system maximum operating voltage 412kV and the maximum switching overvoltage (700kV) of system; Live line working personnel are when equipotential, and while at least keeping the distance of the earth electrodes such as operating personnel and steel tower to be the 3rd preset distance, its insulation withstand voltage is greater than system maximum operating voltage (412kV) and system maximum switching overvoltage (700kV).
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described further.Fig. 2 is the structural representation of according to the preferred embodiment of the invention ± 400kV DC power transmission line tangent tower, Fig. 3 is schematic diagram when operating personnel arrives at the position parallel with electrified body according to the preferred embodiment of the invention, Fig. 4 is schematic diagram when operating personnel leaves tangent tower and approaches electrified body according to the preferred embodiment of the invention, and Fig. 5 is schematic diagram when operating personnel arrives electrified body according to the preferred embodiment of the invention.
As shown in Figure 2, this tangent tower comprises: steel tower 22, insulator 24, grading ring 26, wire 28.As shown in Figure 3, description of symbols wherein: operating personnel 32, and D1 represents the distance of the electrified bodies such as operating personnel and wire.As shown in Figure 4, description of symbols wherein: insulation delivery vehicle 42, S1 represents that operating personnel is to the distance of the earth electrodes such as steel tower, S2 represents that operating personnel is to the distance of the electrified bodies such as wire.As shown in Figure 5, wherein description of symbols: D2 represents that operating personnel is to the distance of the earth electrodes such as steel tower.
At the preferred embodiment of the present invention ± 400kV Qinghai-Tibet networking DC power transmission line tangent tower, enter equipotential safety method as follows:
(1), a complete set of shielding clothing has been dressed on operating personnel 32 ground under tower; step on steel tower 22 to tower body and wire horizontal level; step in tower process; operating personnel 32 is in earth potential; the distance of the electrified body such as operating personnel and wire is D1; for guaranteeing that the injury of getting an electric shock does not occur operating personnel 32, D1 at least remains on the first preset distance, as shown in Figure 3;
(2), operating personnel 32 takes insulation delivery vehicle 42 levels and enters high electric field, enter in process, operating personnel 32 current potential that mediates, operating personnel to the distance of the earth electrodes such as steel tower be S1, operating personnel to the distance of the electrified bodies such as wire be S2, S1 and S2 sum should at least remain on the second preset distance, as shown in Figure 4;
(3), after the electrified body such as operating personnel's 32 contact wires 28, in equipotential, operating personnel is D2 to the distance of the earth electrodes such as steel tower, D2 should at least remain on the 3rd preset distance, as shown in Figure 5.
It should be noted that, in the preferred embodiment of the present invention, definite method of above-mentioned distance range is as follows:
When ± 400kV Qinghai-Tibet networking DC power transmission line is carried out live line working, impact due to high height above sea level and atmospheric density, make to exist on circuit with area, sea level portion with operating voltage and switching overvoltage, when the air gap between operating personnel 32 and line facility is not enough to bear operating voltage and switching overvoltage, will there is operation gap and puncture and cause operating personnel's 32 electric shock casualty accidents.
± 400kV DC power transmission line maximum working voltage amplitude is 412kV, and the issuable maximum switching overvoltage amplitude of circuit is 1.7p.u. (1p.u.=412kV), i.e. 700kV.In order to guarantee operating personnel 32 safety, under the effect of system maximum working voltage and maximum switching overvoltage, air gap between operating personnel 32 and line facility, can tolerate the effect of voltage, or the discharge probability in gap is controlled at acceptable small degree.
Live line working personnel 32 enter transmission line tangent tower equal, can take insulation delivery vehicle 42 to wire 28 from steel tower 22, according to the actual conditions of ± 400kV Qinghai-Tibet networking DC power transmission line, the analogue test of high altitude localities of take is foundation, the discharge voltage of operation gap and withstand voltage have been obtained in different work position and different work clearance distance situation.According to hot line maintenance insulation coordination method, the actual conditions of the DC power transmission line of basis ± 400kV Qinghai-Tibet networking simultaneously, determined that operating personnel 32 enters in equipotential process, when earth potential, intermediate potential, equipotential, and the distance range between the equipment such as steel tower 22, wire 28.
In sum, by the method in the preferred embodiment of the present invention, operating personnel, step on steel tower 22 to tower body and wire horizontal level, at least keeping with the distance of electrified body is the first preset distance, in leaving the process that approaches electrified body for him, the distance that at least keeps operating personnel and electrified body is the second preset distance, after arriving electrified body, the distance that at least keeps operating personnel and steel tower is the 3rd preset distance, by this method, can guarantee whole entering in equipotential process, operating personnel 32 is positioned at earth potential, intermediate potential, during equipotential, can there is not Danger Electric shock risk, live line working work can be completed safely smoothly.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (7)

1. enter a method for HVDC (High Voltage Direct Current) transmission line tangent tower equal, it is characterized in that comprising:
Operating personnel arrives at the position parallel with the electrified body of HVDC (High Voltage Direct Current) transmission line by the tangent tower of ground connection, and at least maintenance is the first preset distance with the distance of described electrified body;
Described operating personnel leaves described tangent tower, close to described electrified body, and at least to keep described tangent tower to the distance sum of the electrified bodies such as described operating personnel's distance and described operating personnel be extremely described be the second preset distance;
Described operating personnel arrives described electrified body, and at least maintenance is the 3rd preset distance with the distance of described tangent tower.
2. method according to claim 1, it is characterized in that, described the first preset distance, the second preset distance and the 3rd preset distance are determined according to maximum working voltage and input operating range, wherein, described maximum working voltage and input operating range are to determine according to the height above sea level in the region of described tangent tower setting and atmospheric density.
3. method according to claim 1, is characterized in that, the tangent tower of described ground connection is in earth potential.
4. method according to claim 1, is characterized in that, described operating personnel is close to described electrified body by insulation delivery vehicle.
5. method according to claim 4, is characterized in that, the described insulation delivery vehicle current potential that mediates.
6. according to arbitrary described method in claim 1 to 5, it is characterized in that, described HVDC (High Voltage Direct Current) transmission line is ± 400kV DC power transmission line.
7. method according to claim 6, is characterized in that, described operating personnel dresses a complete set of shielding clothing.
CN201310690478.7A 2013-12-16 2013-12-16 Method for entering high-voltage direct-current transmission line tangent tower equal potential Pending CN103715629A (en)

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Application Number Priority Date Filing Date Title
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080024845A (en) * 2006-09-15 2008-03-19 한국전기공사협회 Approaching method to live line in transmission towers
CN101227068A (en) * 2007-12-27 2008-07-23 国网武汉高压研究院 Equipotential access method of alternating current ultra / super high-tension line live-line work and electric potential transferring stick
CN101567530A (en) * 2009-06-03 2009-10-28 国网电力科学研究院 Safe method for entering tangent tower equal potentials for live-wire operation in 660kV direct current lines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080024845A (en) * 2006-09-15 2008-03-19 한국전기공사협회 Approaching method to live line in transmission towers
CN101227068A (en) * 2007-12-27 2008-07-23 国网武汉高压研究院 Equipotential access method of alternating current ultra / super high-tension line live-line work and electric potential transferring stick
CN101567530A (en) * 2009-06-03 2009-10-28 国网电力科学研究院 Safe method for entering tangent tower equal potentials for live-wire operation in 660kV direct current lines

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Application publication date: 20140409

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