CN103618249A - technology for electrified overhaul of +-500kV double-circuit direct-current power transmission lines on same tower - Google Patents
technology for electrified overhaul of +-500kV double-circuit direct-current power transmission lines on same tower Download PDFInfo
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- CN103618249A CN103618249A CN201310616162.3A CN201310616162A CN103618249A CN 103618249 A CN103618249 A CN 103618249A CN 201310616162 A CN201310616162 A CN 201310616162A CN 103618249 A CN103618249 A CN 103618249A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Abstract
The invention provides a technology for electrified overhaul of +-500kV double-circuit direct-current power transmission lines on the same tower. The operation method entering equal potential comprises the following steps that an equal potential worker and a ground potential worker carry an insulated conveying rope to climb the tower to a ground wire support to tie a safety belt, and install an insulation pulley and the insulated conveying rope on the ground wire support for operation; ground workers pass an insulated soft ladder and insulated soft ladder hangers to the position of the ground potential worker; the ground potential worker dismounts a damper of an overhead ground wire at the working side, and installs the soft ladder hangers on the overhead ground wire reliably; after the equal potential worker checks that all the parts of shield clothes are connected well, the equal potential worker ties an insulated protecting rope, goes to the insulated soft ladder to stand and tie the safety belt on the insulated soft ladder; the ground workers use tail ropes of the insulated soft ladder for swinging the insulated soft ladder and when the distance between the equal potential worker and electrified conducting wires is about 0.5 m, the equal potential worker quickly grabs the conductive wires and carries out potential transfer. The technology for electrified overhaul of the +-500kV double-circuit direct-current power transmission lines on the same tower fills the gaps in domestic and foreign ultra-high direct-current electrified overhaul technology.
Description
[technical field]
The present invention relates to ehv power transmission field, relate in particular to a kind of ± 500kV common-tower double-return DC power transmission line hotline maintenance technique.
[background technology]
Transmission line operation maintenance service work is the important means of grasping operation of power networks situation, discovery in time and treatment facility defect, is also the element task of guaranteeing line security stable operation.Because supergrid is in service in core status at whole national grid, so the operating maintenance work of supergrid is of great significance for safe, stable, the reliability service tool that guarantee super extra-high voltage grid and even whole national grid.
Pueraria lobota Shanghai direct current comprehensive reformation ± 500kV Ge Nan line (woods maple line) common-tower double-return DC transmission engineering is the Innovation project of world's HVDC Transmission Technology development, is current domestic outside bar common-tower double-return DC transmission engineering.This project is to utilize the mono-loop line of former Ge Nan (capacity is 1200MW) path to transform the engineering of double back ± 500kV increase-volume DC line (capacity is 2 * 3000MW) as, that State Grid Corporation of China implements sturdy power grid construction, implement the another key project of country's transferring electricity from the west to the east energy development strategy, for further expansion Three Gorges and Sichuan Hydropower, send scale, strengthen the electrical network contact of Central China and East China, building national sturdy power grid has positive effect.
± 500kV common-tower double-return circuit is brand-new operational mode of DC line, and its line construction, window gap etc. has been compared very large difference, especially tower structure with other engineering, strain insulator porcelain rod insulator string assembling form has a very large change.Therefore, the needs of can not meet ± 500kV of traditional operational method common-tower double-return DC line maintenance.As will be overhauled, live line working, be first must a set of science of research operational method, comprise operating type and operation technique flow process.The research of ± 500kV common-tower double-return DC line maintenance, live line working method and operation Work tool will be our current problem demanding prompt solution.The achievement in research of this problem will be filled up the maintenance of China ± 500kV common-tower double-return DC power transmission line and live working tools development and the practical technical blank of live line working.To the maintenance of start ± 500kV common-tower double-return DC line, improve line maintenance efficiency, guarantee that the general level of the health of equipment plays huge effect.
[summary of the invention]
In view of this, for overcoming the deficiencies in the prior art, the hotline maintenance technique of the be applicable to ± 500kV common-tower double-return DC power transmission line that is necessary to provide a kind of.
A kind of ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, described hotline maintenance technique comprises and enters equipotential operational method, describedly enter equipotential operational method and comprise the following steps: after equipotential workman and earth potential workman dress according to dressing standard, carrying insulation and transmitting rope and step on tower to earth wire support place and fasten seat belts, insulation coaster and insulation are transmitted to restrict being arranged on operation earth wire support appropriate location; The insulated flexible ladder hanging head that surfaceman transmits insulated flexible ladder, install rope ladder tricing line is to earth potential workman position; Earth potential workman removes the stockbridge damper of active side overhead ground wire, then rope ladder hanging head is reliably arranged on overhead ground wire, and installs rope ladder hanging head tricing line; After equipotential workman checks that screening clothing each several part connects well, fasten insulation protection rope, climb up insulated flexible ladder station good and safety belt is lain on insulated flexible ladder, if strain rod tower earth potential workman utilizes rope ladder hanging head tricing line that insulated flexible ladder is moved to the parallel place of strain clamp along overhead ground wire, if straight line pole earth potential workman utilizes rope ladder hanging head tricing line that insulated flexible ladder is moved to about 5m outward along overhead ground wire, equipotential workman is descending along insulated flexible ladder, when concordant with upper sub-conductor to shoulder, stops; Surfaceman utilizes insulated flexible ladder tail rope to swing insulated flexible ladder, and equipotential workman stretches out one's hand fast during apart from the about 0.5m of live wire place and holds wire and carry out potential transfer.
Therein at least one embodiment; described, enter in equipotential operational method; equipotential workman fastens seat belts after entering current potential; and need to determine whether to remove insulation protection rope according to operation; equipotential workman check screening clothing each several part connect good after, climb up insulated flexible ladder station good and safety belt is lain on insulated flexible ladder.
Therein at least one embodiment, described dressing standard comprises, equipotential workman wears and in a complete set of shielding clothing and shielding clothing, wears fire-retardant underwear, described shielding clothing comprises shielding cap, shielding clothing, screening glove, screening socks, shielding footwear and shielding face shield, and earth potential workman must wear a complete set of electrostatic protective clothing and conductive shoes.
In at least one embodiment, after hotline maintenance work completes, according to following steps, exit equipotential therein: equipotential workman check screening clothing each several part connect good after, climb up insulated flexible ladder station good and safety belt is lain on insulated flexible ladder; Equipotential workman unclamps wire and arm is regained rapidly, and surfaceman utilizes insulated flexible ladder tail rope to swing insulated flexible ladder, and equipotential workman exits equipotential; Earth potential workman utilizes insulated flexible ladder tricing line that insulated flexible ladder is moved to cross-arm place along overhead ground wire at earth wire support place, and equipotential workman unties the safety belt lying on insulated flexible ladder, and upwards cross-arm is climbed up in climbing, fastens seat belts; Earth potential workman coordinates the whole instruments of dismounting with surfaceman, and the installation that recovers ground wire shockproof hammer; Equipotential workman, earth potential workman check on tower without after legacy, carrying insulation and transmitting the lower tower of rope.
Therein at least one embodiment, described hotline maintenance technique comprises the operational method of changing two " V " insulator strings of straight line, firmly turning two " L " insulator strings, two " V " insulator strings of described replacing straight line, the operational method that firmly turns two " L " insulator strings comprise the following steps: utilize reserved construction hole, insulator string hanging point place or the main material in hanging point place to do fulcrum on the tower of instrument, cross arm of tower special mould clamp is installed, and the side of wire was fulcrum that utilizes side of wire was duplex plate to make instrument is installed machete card; By carrying line apparatus, high-strength insulating pull bar is connected with special mould clamp on tower, forms the mechanical load transfer system of insulator string; Utilize the card of machete card to carry on the back with duplex plate contact position as fulcrum, and machete card is divided into actuation arm and motion arm, the linear deflection of proposing that line apparatus carries out small distance is proposed in operation, drive machete card motion arm to rotate, induced effect arm shifts load on insulator string, make to be overhauled the load transfer of insulator string machinery to putting forward wire system, realize maintenance and the replacing of insulator string.
Therein at least one embodiment, at two " V " insulator strings of described replacing straight line, firmly turn in the operational method of two " L " insulator strings, described in carry line apparatus and comprise mechanical screw mandrel, hydraulic screw rod.
Therein at least one embodiment, described hotline maintenance technique comprises the operational method of changing strain insulator porcelain rod insulator, the operational method of described replacing strain insulator porcelain rod insulator comprises the following steps: enter after current potential, two equipotential workmans adopt back-to-back mode erect-position on adjacent porcelain rod insulator, utilize towing plate and parallel link plate to do fulcrum cross-arm side strain insulator personality card is installed, utilizing porcelain rod insulator steel cap to do after fulcrum is installed closed fixture blocks, with hydraulic screw rod assembly, connect strain insulator personality card and closed fixture composition stringing system, then tripod assembly is installed for means of transportation and insulator, before and after utilizing, rod insulator steel cap is made front card and the rear card that fulcrum is installed respectively closed fixture, and the front card and the rear card that with hydraulic screw rod assembly, connect closed fixture form stringing system, then tripod assembly are installed for means of transportation and insulator, utilize insulator steel cap to do before fulcrum is installed closed fixture and block, utilize yoke plate to make fulcrum conducting wire lateral wing type card, with hydraulic screw rod assembly connection closed fixture and side of wire was wing clamp, form stringing system, then tripod assembly is installed for means of transportation and insulator, operation hydraulic screw rod tightens up stringing system, shifts by the mechanical load on maintenance porcelain rod insulator, realizes replacing and the maintenance of insulator.
Of the present invention ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, it is domestic and international first superhigh pressure common-tower double-return DC power transmission line live line working application technical research project, the research of the feature by ± 500kV common-tower double-return DC power transmission line, realized the completing and the application of achievement in research of project research work, filled up the blank of domestic and international superhigh voltage DC live line working, hotline maintenance applied technical field.
[accompanying drawing explanation]
Fig. 1 is for adopting the schematic diagram that enters equipotential method in preferred embodiment ± 500kV common-tower double-return DC power transmission line hotline maintenance technique of the present invention.
Fig. 2 is the schematic diagram of " just carrying line " method replacing insulator string.
Fig. 3 A, 3B are respectively front view and the vertical view of changing two " V " insulator strings of straight line, firmly turning the machete card adopting in two " L " insulator string operational methods.
Fig. 4 for adopting two " V " insulator strings of machete card replacement straight line in Fig. 3, firmly turn the operation chart of two " L " insulator strings.
Fig. 5 A, 5B are respectively the front card of fluid pressure type closed fixture that adopts in the method for changing strain insulator porcelain rod insulator and the structural representation of rear card.
Fig. 6 A, 6B are respectively the partial sectional view of cross-arm side wing clamp and the partial sectional view of another angle adopting in the method for changing strain insulator porcelain rod insulator.
Fig. 7 is for changing the structural representation of the side of wire was wing clamp adopting in the method for strain insulator porcelain rod insulator.
[embodiment]
For understanding better the present invention, below with reference to accompanying drawing and instantiation, invention is described in detail.
Before technical scheme of the present invention is described in detail, first the theoretical foundation of project research is simply stated:
(1) according to designing units such as Central Southern China Electric Power Design Institute, provide ± tower structure, insulator serial type, gold utensil type of attachment, lead wire and earth wire arrangement and permanent way machine load level and the air gap form of 500kV direct current common-tower double-return circuit;
(2) according to State Network Electric Power Research Institute right ± analytical calculation of 500kV common-tower double-return DC power transmission line overvoltage level and ± research of 500kV common-tower double-return DC line live line working gap experiment, the live line work insulatings such as the superhigh pressure common-tower double-return DC line live line working minimum safe distance of proposition, minimum combination gap, the effective insulated lengths of instrument and effectively insulator sheet number coordinate theoretical value;
(3) according to the live line working minimum safe distance of the new edition < < safety > > in 2009 of Guo Wang company and < < ± 500kV DC power transmission line live line working technology guide rule > > defined, minimum combination gap, the effective insulated lengths of instrument and effectively the live line work insulating such as insulator sheet number coordinate theoretical value;
(4) test values such as the live line working minimum safe distance calculating according to the < of State Network Electric Power Research Institute < ± 500kV common-tower double-return DC line live line working experimental study > > (February 28 2010 the 36th volume second phase of high voltage technique), minimum combination gap.
± 500kV Ge Nan (woods maple line) common-tower double-return DC power transmission line engineering (i.e. two times, three Shanghai DC transmission engineering) is as the super high voltage direct current electricity transmission engineering of First common-tower double-return, its power transmission lines overhauling, live line working are operated in both at home and abroad not yet to be carried out, and its operation technique and application tool development work are needed solution badly.
± 500kV Ge Nan line (woods maple line) common-tower double-return DC power transmission line general structure is comprised of shaft tower, insulator, lead wire and earth wire and connection gold utensil, has increased one deck cross-arm be used for bearing another loop line road than single time superhigh voltage DC circuit tower.Be located on the basis of deep digestion Liao Guowang Electric Power Section institute about ± 500kV common-tower double-return DC line live line working technical research achievement, serious analysis ± 500kV common-tower double-return DC line design parameter, fully inquired into the otherness with common ± 500kV electric pressure live line working, particularity, studied the operation of common-tower double-return superhigh voltage DC line maintenance, live line working method of operation and operating procedure, determined ± 500kV common-tower double-return DC line live line work insulating coordinates parameter, emphasis conducts in-depth research entering the technological process of equipotential method and replacing insulator, verify the concrete measure of charged operating personnel's protection.
First, entering equal potential working is live line working elemental operation mode, is again the basis that other live line working projects realize.First break through the difficulty that enters current potential, according to ± 500kV common-tower double-return DC power transmission line project organization feature, the gap form of shaft tower window size and job requirements and air gap level, abandoned traditional cross-arm and hung rope ladder and vertically enter equipotential mode, research and design driving rope ladder level swing in equipotential operational method.
By being swung in to equipotential operational method, driving rope ladder level at length introduces below.
On the tower of this method, operating personnel needs two, wherein one is called equipotential electrician, earth potential electrician on another tower by name.Before entering equipotential, equipotential workman must wear a complete set of shielding clothing, comprises cap, clothing, gloves, socks and footwear, and wears shielding face shield.In addition, in shielding clothing, also should wear fire-retardant underwear.。Earth potential workman must wear a complete set of electrostatic protective clothing and conductive shoes.
Equipotential workman and earth potential workman enter equipotential after dressing according to above-mentioned dressing standard according to the following steps:
(1) equipotential workman, earth potential workman carry insulation transmission rope and step on tower to earth wire support place, fasten seat belts, and insulation coaster and insulation are transmitted to restrict in operation earth wire support appropriate location, install.
(2) surfaceman transmits insulated flexible ladder, insulated flexible ladder hanging head (installing rope ladder tricing line) to earth potential workman position.
(3) stockbridge damper that earth potential workman removes active side overhead ground wire is (if ground wire is insulated static wire, need be in active side not by insulated static wire reliable ground before work), then rope ladder hanging head is reliably arranged on overhead ground wire, and installs rope ladder hanging head tricing line.
(4) equipotential workman check screening clothing each several part connect good after, fasten insulation protection rope, climb up insulated flexible ladder station good and safety belt is lain on insulated flexible ladder.If strain rod tower, earth potential workman utilizes rope ladder hanging head tricing line that insulated flexible ladder is moved to the parallel place of strain clamp along overhead ground wire.If straight line pole, earth potential workman utilizes rope ladder hanging head tricing line that insulated flexible ladder is moved to about 5m outward along overhead ground wire, and equipotential workman is descending along insulated flexible ladder, when concordant with upper sub-conductor to shoulder, stops.
(5) surfaceman utilizes insulated flexible ladder tail rope to swing insulated flexible ladder, and equipotential workman stretches out one's hand fast during apart from the about 0.5m of live wire place and holds wire and carry out potential transfer.
(6) equipotential workman fastens seat belts after entering current potential, and need to whether remove insulation protection rope according to operation.
Enter after equipotential hotline maintenance work that can carry out ± 500kV common-tower double-return DC power transmission line.For example, charged for replacement hammer for preventing conductor from vibration, live-line replacing strain side of wire was gold utensil, charged for replacement are adjusted lead spacer and replacing insulator under electrified etc.Hereinafter will the maintenance craft of part parts be wherein described in detail.
After hotline maintenance work completes, equipotential workman can exit equipotential as follows:
(1) equipotential workman check screening clothing each several part connect good after, climb up insulated flexible ladder station good and safety belt is lain in to (one holds insulated flexible ladder, and proficiency arm stretching is held wire) on insulated flexible ladder.
(2) after agreeing to subject to work director, equipotential workman unclamps wire and arm is regained rapidly, and surfaceman utilizes insulated flexible ladder tail rope to swing insulated flexible ladder, and equipotential workman exits equipotential.
(3) earth potential workman utilizes insulated flexible ladder tricing line that insulated flexible ladder is moved to cross-arm place along overhead ground wire at earth wire support place.Equipotential workman unties the safety belt lying on insulated flexible ladder, and upwards cross-arm is climbed up in climbing, fastens seat belts.
(4) earth potential workman coordinates the whole instruments of dismounting with ground electrician, and the installation (if any finally removing earth connection) that recovers ground wire shockproof hammer.
(5) equipotential workman, earth potential workman check on tower without after legacy, carrying insulation and transmitting the lower tower of rope.
According to the above-mentioned method that enters and exit current potential, the parts on can right ± 500kV common-tower double-return DC power transmission line overhaul.Because the events in operation in ± 500kV common-tower double-return DC power transmission line are many, the maintenance mode of part parts is identical with operational method before, therefore at this, does not repeat.To the emphasis method of operation of the hotline maintenance techniques such as replacing insulator under electrified be described in detail below.
First, the operational method that " the micro-collimation method of carrying of lever principle " changed to two " V " insulator strings of straight line, firmly turns two " L " insulator strings describes.
± 500kV Ge Nan line (woods maple line) common-tower double-return Pre-Engineering Design of Long Distance, the whole tangent towers of circuit adopt two " V " insulator strings and hard capstan head to adopt the assembling mode of two " L " insulator strings.When there is defect in insulator string parts, the general mechanical load that adopts " just carrying line " mode to shift insulator string, maintenance and replacing insulator string.Refer to Fig. 2, so-called " just carrying line " mode mainly refers to, with locating to reserve construction hole (or main material) directly over wire yoke plate, do fulcrum on the tower of instrument, cross arm of tower special mould clamp (or fastening means) is installed, by connection, carry line apparatus (mechanical screw mandrel or hydraulic screw rod), high-strength insulating pull bar, quadripartion line lifter and be connected and be connected with wire, the mechanical load transfer system of composition insulator string.By operate machine screw mandrel or hydraulic screw rod, load transfer system is tightened up stressed, slowly wire is mentioned, make to be overhauled the load transfer of insulator string machinery to putting forward wire system, realize the maintenance of insulator string.Yet, the mechanical load of carrying lineman's utensil of the operating type of this " just carrying line " is large, may cause maintenance side insulator string horizontal direction force to diminish, thereby wire is offset round about, when and in maintenance during defective insulator string, insulator string also will adopt the wire lateral displacement measure that prevents while resetting, reset difficult with exemption from inspection insulator string.
Therefore, according to the design feature of ± 500kV common-tower double-return DC power transmission line design, in this project, change two " V " insulator strings of straight line, firmly turn two " L " insulator string operations and adopt machete cards and utilize " the micro-line working system of carrying of lever principle " to shift the mechanical load of insulator string.The structure of machete card is as shown in Fig. 3 A, 3B.Incorporated by reference to consulting Fig. 4, the hook that one end of machete card matches for the core through screw rod with inverted triangle duplex plate, the other end is the opening for external screw mandrel.The waist of coupling hook and opening is provided with the platform contacting with the bottom side of inverted triangle duplex plate.The hook end of machete card has the bayonet socket that is sleeved on inverted triangle duplex plate both sides, and the root platform of bayonet socket contacts with inverted triangle duplex plate bottom side.The opening both sides of machete card are provided with the through hole that milled screw is installed, and this through hole is for external screw mandrel.The waist of machete card is also provided with groove.If need to safeguard in advance and overhaul by the gold utensil on a certain side on respect to triangle duplex plate, when first the bayonet socket of machete card being installed on to this side bottom of inverted triangle duplex plate, hook catches on the core through screw rod in inverted triangle duplex plate center, the root platform of bayonet socket holds up the pre-maintenance of inverted triangle duplex plate and one end of maintenance, the other end of inverted triangle duplex plate upper side is fulcrum like this, and openend is lever end.And then at the external screw mandrel of openend, by manual adjustment screw mandrel, openend applying to power, lever end is that opening part only need apply less strength and just the heavier load on one end of the pre-maintenance of triangle duplex plate and maintenance can be laid down like this.
Adopt machete card and utilize " the micro-line working system of carrying of lever principle " to change two " V " insulator strings of straight line, the concrete operations of operational method that firmly turn two " L " insulator strings are as follows:
(1) utilize reserved construction hole, insulator string hanging point place (or the main material in hanging point place) to do fulcrum on the tower of instrument, cross arm of tower jig is installed, the side of wire was fulcrum that utilizes side of wire was duplex plate to make instrument is installed machete card;
(2) by carrying line apparatus (mechanical screw mandrel or hydraulic pressure silk), high-strength insulating pull bar is connected with cross-arm jig on tower, forms the mechanical load transfer system of insulator string;
(3) utilize the card of machete card to carry on the back with duplex plate contact position as fulcrum, and machete card is divided into actuation arm and motion arm, the linear deflection of proposing that line apparatus carries out small distance is proposed in operation, drive machete card motion arm to rotate, induced effect arm shifts load on insulator string, make to be overhauled the load transfer of insulator string machinery to putting forward wire system, realize the maintenance of insulator string.
In above-mentioned technique, two " V " insulator string, the live load that firmly turns two " L " insulator string machete cards are 50KN.Above-mentioned technique is owing to having utilized lever principle, the linear deflection of proposing that line apparatus carries out small distance is proposed in operation, can drive machete card motion arm to rotate, induced effect arm shifts load on insulator string, can change quickly and easily two " V " insulator strings, firmly turn two " L " insulator strings.
Finally, will be described in detail changing the operational method of strain insulator.
Replacing strain insulator, insulator string are the conventional projects of power transmission lines overhauling and live line working, are also the routine works of transmission line operating maintenance.In general maintenance craft, change strain insulator, insulator string have traditional employing bottle-holding rack change strain insulator method and improve after the revolving method of putting change strain insulator method.Bottle-holding rack method is, at maintenance insulator string two ends, stringing system is installed, and thereunder place bottle-holding rack, tightening up stringing system makes insulator string avoid wire tension, then throw off linking of insulator string and wire, cross-arm, then by insulated sling, with bottle-holding rack, will overhaul insulator string and place ground, anti-work flow completes upkeep operation afterwards.Revolving the method for putting is, first with insulator string tensioning device, loosens insulator, then with the anti-insulator that leads of trailer system, side of wire was porcelain vase is thrown off, and along tower hitch point, revolves and puts porcelain vase string and put to ground to upright position again.Anti-work flow completes upkeep operation.
± 500kV Ge Nan line (woods maple line) common-tower double-return line tension insulator string is designed to horizontal glass insulator or porcelain rod insulator duplex string assembling mode.Wherein glass string minimum (Qing Wu district) 40, reaches 10.737 meters, and single string weight reaches 0.73T, and maximum (Chong Wu district) 57, reaches 14.222 meters, single about 0.97T that weighs that goes here and there; Porcelain rod insulator string forms by 7, reaches 14.772 meters, the heavily about 0.95T of single string.Although the maintenance mode that whole string is changed, adopt traditional changing strain insulator string method to carry out the tissue of construction equipment and on-the-spot practical operation all can realize technically, but as conventional maintenance, particularly take the mode of live line working overhaul or have sizable difficulty.Therefore, the project organization of this project basis ± 500kV common-tower double-return DC line engineering double strain and the insulation form of employing, the operating type primary study design of selecting single Zhi Genghuan is replaced porcelain rod insulator by short circuit null value, thereby reaches the object of replacing.Its concrete operating process is as follows:
(1) enter after current potential, two equipotential workmans adopt " back-to-back " mode erect-position on adjacent rod insulator, utilize towing plate (QY-42S type) and parallel link plate (P-42S) to do fulcrum cross-arm side strain clamped (as shown in Figure 6) is installed, utilize porcelain rod insulator steel cap to do after fulcrum is installed closed fixture and block (as shown in Figure 5), with hydraulic screw rod assembly, connect strain insulator personality card and closed fixture composition stringing system, then tripod assembly is installed for means of transportation and insulator;
(2) utilize front and back rod insulator steel cap to make front card and the rear card (as shown in Figure 5) that fulcrum is installed respectively closed fixture, the front card and the rear card that with hydraulic screw rod assembly, connect closed fixture form stringing system, then tripod assembly are installed for means of transportation and insulator;
(3) utilizing insulator steel cap to do before fulcrum is installed closed fixture blocks, utilize yoke plate (LS-84600500S type) to make fulcrum conducting wire side special airfoil card (as shown in Figure 7), with hydraulic screw rod assembly, connect closed fixture and side of wire was special airfoil card formation stringing system, then tripod assembly is installed for means of transportation and insulator;
(4) operation hydraulic screw rod tightens up stringing system, shifts by the mechanical load on maintenance porcelain rod insulator, realizes replacing and the maintenance of insulator.
The monolithic Renewal process of common insulator: utilize cross-arm side yoke plate to do fulcrum, cross-arm side strain insulator personality card is installed, utilize insulator steel cap to do fulcrum, card before the sub-closed fixture of installing insulating, connects strain insulator personality card and closed fixture composition stringing system with hydraulic screw rod; Utilize insulator steel cap to do fulcrum, front card and the rear card of the sub-closed fixture of installing insulating, form stringing system with front card and the rear card of hydraulic screw rod connecting insulator closed fixture respectively; Utilize insulator steel cap to do fulcrum, after the sub-closed fixture of installing insulating, block, utilize side of wire was yoke plate to do fulcrum, conducting wire side conversion wing clamp, with hydraulic screw rod, connect closed fixture and side of wire was conversion wing clamp composition stringing system, operation hydraulic screw rod tightens up stringing system, shifts by the mechanical load on maintenance insulator, realizes replacing and the maintenance of insulator.By above-mentioned technique, can realize the monolithic of strain insulator string is changed, guaranteed the operation convenient degree of strain insulator string as routine maintenance.
In sum, of the present invention ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, be domestic and international first ± 500kV common-tower double-return live line working application technical research project, the completing and the application of achievement in research of project research work, has filled up the blank of both at home and abroad ± 500kV common-tower double-return DC power transmission line live line working, hotline maintenance applied technical field.Contained ± 500kV of concrete operational method common-tower double-return DC power transmission line maintenance in of the present invention ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, the conventional service work content of live line working, the operational method that the list of porcelain strut insulator replacing tool wherein, large-tonnage assembled hydraulic screw mandrel props up the replacing of short circuit method is applied to live line working, in be particularly applied to ± 500kV common-tower double-return circuit homework method, it is the important breakthrough of live line working applied technical field
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (7)
1. ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, described hotline maintenance technique comprises and enters equipotential operational method, described in enter equipotential operational method and comprise the following steps:
After equipotential workman and earth potential workman dress according to dressing standard, carrying insulation and transmitting rope and step on tower to earth wire support place and fasten seat belts, insulation coaster and insulation are transmitted to restrict being arranged on operation earth wire support appropriate location;
The insulated flexible ladder hanging head that surfaceman transmits insulated flexible ladder, install rope ladder tricing line is to earth potential workman position;
Earth potential workman removes the stockbridge damper of active side overhead ground wire, then rope ladder hanging head is reliably arranged on overhead ground wire, and installs rope ladder hanging head tricing line;
After equipotential workman checks that screening clothing each several part connects well, fasten insulation protection rope, climb up insulated flexible ladder station good and safety belt is lain on insulated flexible ladder, if strain rod tower earth potential workman utilizes rope ladder hanging head tricing line that insulated flexible ladder is moved to the parallel place of strain clamp along overhead ground wire, if straight line pole earth potential workman utilizes rope ladder hanging head tricing line that insulated flexible ladder is moved to about 5m outward along overhead ground wire, equipotential workman is descending along insulated flexible ladder, when concordant with upper sub-conductor to shoulder, stops;
Surfaceman utilizes insulated flexible ladder tail rope to swing insulated flexible ladder, and equipotential workman stretches out one's hand fast during apart from the about 0.5m of live wire place and holds wire and carry out potential transfer.
2. according to claim 1 ± 500kV common-tower double-return DC power transmission line hotline maintenance technique; it is characterized in that: described, enter in equipotential operational method; equipotential workman fastens seat belts after entering current potential; and need to determine whether to remove insulation protection rope according to operation; equipotential workman check screening clothing each several part connect good after, climb up insulated flexible ladder station good and safety belt is lain on insulated flexible ladder.
3. according to claim 1 ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, it is characterized in that: described dressing standard comprises, equipotential workman wears and in a complete set of shielding clothing and shielding clothing, wears fire-retardant underwear, described shielding clothing comprises shielding cap, shielding clothing, screening glove, screening socks, shielding footwear and shielding face shield, and earth potential workman must wear a complete set of electrostatic protective clothing and conductive shoes.
4. according to claim 1 ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, is characterized in that, after hotline maintenance work completes, according to following steps, exiting equipotential:
Equipotential workman check screening clothing each several part connect good after, climb up insulated flexible ladder station good and safety belt is lain on insulated flexible ladder;
Equipotential workman unclamps wire and arm is regained rapidly, and surfaceman utilizes insulated flexible ladder tail rope to swing insulated flexible ladder, and equipotential workman exits equipotential;
Earth potential workman utilizes insulated flexible ladder tricing line that insulated flexible ladder is moved to cross-arm place along overhead ground wire at earth wire support place, and equipotential workman unties the safety belt lying on insulated flexible ladder, and upwards cross-arm is climbed up in climbing, fastens seat belts;
Earth potential workman coordinates the whole instruments of dismounting with surfaceman, and the installation that recovers ground wire shockproof hammer;
Equipotential workman, earth potential workman check on tower without after legacy, carrying insulation and transmitting the lower tower of rope.
According to described in any one in claim 1 to 4 ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, it is characterized in that, described hotline maintenance technique comprises the operational method of changing two " V " insulator strings of straight line, firmly turning two " L " insulator strings, and two " V " insulator strings of described replacing straight line, the operational method that firmly turns two " L " insulator strings comprise the following steps:
Utilize reserved construction hole, insulator string hanging point place or the main material in hanging point place to do fulcrum on the tower of instrument, cross arm of tower special mould clamp is installed, the side of wire was fulcrum that utilizes side of wire was duplex plate to make instrument is installed machete card;
By carrying line apparatus, high-strength insulating pull bar is connected with special mould clamp on tower, forms the mechanical load transfer system of insulator string;
Utilize the card of machete card to carry on the back with duplex plate contact position as fulcrum, and machete card is divided into actuation arm and motion arm, the linear deflection of proposing that line apparatus carries out small distance is proposed in operation, drive machete card motion arm to rotate, induced effect arm shifts load on insulator string, make to be overhauled the load transfer of insulator string machinery to putting forward wire system, realize maintenance and the replacing of insulator string.
6. according to claim 5 ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, it is characterized in that: at two " V " insulator strings of described replacing straight line, firmly turn in the operational method of two " L " insulator strings, described in carry line apparatus and comprise mechanical screw mandrel and hydraulic screw rod.
According to described in any one in claim 1 to 4 ± 500kV common-tower double-return DC power transmission line hotline maintenance technique, it is characterized in that, described hotline maintenance technique comprises the operational method of changing strain insulator porcelain rod insulator, and the operational method of described replacing strain insulator porcelain rod insulator comprises the following steps:
Enter after current potential, two equipotential workmans adopt back-to-back mode erect-position on adjacent porcelain rod insulator, utilize towing plate and parallel link plate to do fulcrum cross-arm side strain insulator personality card is installed, utilizing porcelain rod insulator steel cap to do after fulcrum is installed closed fixture blocks, with hydraulic screw rod assembly, connect strain insulator personality card and closed fixture composition stringing system, then tripod assembly is installed for means of transportation and insulator;
Before and after utilizing, rod insulator steel cap is made front card and the rear card that fulcrum is installed respectively closed fixture, and the front card and the rear card that with hydraulic screw rod assembly, connect closed fixture form stringing system, then tripod assembly are installed for means of transportation and insulator;
Utilize insulator steel cap to do before fulcrum is installed closed fixture and block, utilize yoke plate to make fulcrum conducting wire lateral wing type card, with hydraulic screw rod assembly connection closed fixture and side of wire was wing clamp, form stringing system, then tripod assembly is installed for means of transportation and insulator;
Operation hydraulic screw rod tightens up stringing system, shifts by the mechanical load on maintenance porcelain rod insulator, realizes replacing and the maintenance of insulator.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616162.3A CN103618249B (en) | 2013-11-27 | 2013-11-27 | ± 500kV common-tower double-return DC power transmission line hotline maintenance techniques |
| PCT/CN2014/083325 WO2015078195A1 (en) | 2013-11-27 | 2014-07-30 | Live overhaul process for ± 500 kv double-loop dc power transmission line on same tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310616162.3A CN103618249B (en) | 2013-11-27 | 2013-11-27 | ± 500kV common-tower double-return DC power transmission line hotline maintenance techniques |
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| CN103618249A true CN103618249A (en) | 2014-03-05 |
| CN103618249B CN103618249B (en) | 2017-03-15 |
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| CN104064990A (en) * | 2014-06-17 | 2014-09-24 | 中国南方电网有限责任公司超高压输电公司南宁局 | Novel in-out equal potential working method |
| CN104201616A (en) * | 2014-09-26 | 2014-12-10 | 陕西省地方电力(集团)有限公司南郑县供电分公司 | Low-voltage power distribution overhead line strain power pole fitting connecting structure and connecting method |
| CN104600629A (en) * | 2015-02-12 | 2015-05-06 | 中国南方电网有限责任公司超高压输电公司百色局 | Compact-circuit six-bundled conductor linkage plate fixture and application thereof |
| CN104638565A (en) * | 2015-01-30 | 2015-05-20 | 国家电网公司 | Method for performing equipotential live line work by putting +/-800kV tangent tower electric transmission line into electric field |
| WO2015078195A1 (en) * | 2013-11-27 | 2015-06-04 | 国家电网公司 | Live overhaul process for ± 500 kv double-loop dc power transmission line on same tower |
| CN104979776A (en) * | 2015-07-10 | 2015-10-14 | 中国电力科学研究院 | Method for entering equipotential level for tension support of UHV transmission line |
| CN105591314A (en) * | 2015-09-09 | 2016-05-18 | 国家电网公司 | UHV DC transmission line strain tower electrified processing hardware fitting fall-off field operation process |
| CN104064990B (en) * | 2014-06-17 | 2016-11-30 | 中国南方电网有限责任公司超高压输电公司南宁局 | Turnover equipotential live line work method |
| CN108649481A (en) * | 2018-04-25 | 2018-10-12 | 中国电力科学研究院有限公司 | Transmission line of alternation current livewire work personnel's equipotential safe transfer method |
| CN109830913A (en) * | 2019-02-11 | 2019-05-31 | 国家电网有限公司 | The combination tool and method of vertical rotary method replacement direct current grounding pole line tension string |
| CN110165600A (en) * | 2019-06-03 | 2019-08-23 | 国家电网有限公司 | A kind of double loop passes in and out the device and method of electric field with tower transmission line of electricity |
| CN114877781A (en) * | 2022-06-07 | 2022-08-09 | 广东骏亚电子科技股份有限公司 | Manufacturing method of stepped groove |
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| WO2015078195A1 (en) * | 2013-11-27 | 2015-06-04 | 国家电网公司 | Live overhaul process for ± 500 kv double-loop dc power transmission line on same tower |
| CN104064990A (en) * | 2014-06-17 | 2014-09-24 | 中国南方电网有限责任公司超高压输电公司南宁局 | Novel in-out equal potential working method |
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| CN104638565A (en) * | 2015-01-30 | 2015-05-20 | 国家电网公司 | Method for performing equipotential live line work by putting +/-800kV tangent tower electric transmission line into electric field |
| CN104600629A (en) * | 2015-02-12 | 2015-05-06 | 中国南方电网有限责任公司超高压输电公司百色局 | Compact-circuit six-bundled conductor linkage plate fixture and application thereof |
| CN104979776A (en) * | 2015-07-10 | 2015-10-14 | 中国电力科学研究院 | Method for entering equipotential level for tension support of UHV transmission line |
| CN105591314A (en) * | 2015-09-09 | 2016-05-18 | 国家电网公司 | UHV DC transmission line strain tower electrified processing hardware fitting fall-off field operation process |
| CN108649481A (en) * | 2018-04-25 | 2018-10-12 | 中国电力科学研究院有限公司 | Transmission line of alternation current livewire work personnel's equipotential safe transfer method |
| CN109830913A (en) * | 2019-02-11 | 2019-05-31 | 国家电网有限公司 | The combination tool and method of vertical rotary method replacement direct current grounding pole line tension string |
| CN110165600A (en) * | 2019-06-03 | 2019-08-23 | 国家电网有限公司 | A kind of double loop passes in and out the device and method of electric field with tower transmission line of electricity |
| CN114877781A (en) * | 2022-06-07 | 2022-08-09 | 广东骏亚电子科技股份有限公司 | Manufacturing method of stepped groove |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103618249B (en) | 2017-03-15 |
| WO2015078195A1 (en) | 2015-06-04 |
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