CN104882876B - A kind of extra-high voltage direct current ground electrode circuit guard system - Google Patents

A kind of extra-high voltage direct current ground electrode circuit guard system Download PDF

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Publication number
CN104882876B
CN104882876B CN201510345132.2A CN201510345132A CN104882876B CN 104882876 B CN104882876 B CN 104882876B CN 201510345132 A CN201510345132 A CN 201510345132A CN 104882876 B CN104882876 B CN 104882876B
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China
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arm
arrester
cross
ground connection
polar conductor
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CN201510345132.2A
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CN104882876A (en
Inventor
何慧雯
周沛洪
戴敏
王磊
万磊
娄颖
李振强
范冕
李晓岚
査志鹏
刘志芹
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Abstract

The present invention provides a kind of extra-high voltage direct current ground electrode circuit guard system, including shaft tower ontology, lightning conducter cross-arm and ground connection polar conductor cross-arm on shaft tower ontology, lightning conducter is fixed at lightning conducter cross-arm both ends respectively, ground connection polar conductor cross-arm both ends pass through insulator S1 and insulator S2 dead earth polar conductor respectively, ground connection polar conductor is connect with the connecting pin of insulator S1 with one end of clearance C 1, ground connection polar conductor is connect with the connecting pin of insulator S2 with one end of clearance C 2, the other end of clearance C 1 and the other end of clearance C 2 are connect with one end of arrester, the other end of arrester is connected with shaft tower ontology.The technical solution can reduce extra-high voltage direct current ground electrode circuit because arcing horn flashover leads to the monopole even accident of bipolar locking; and it can realize that an arrester can protect two ground electrode circuits; guarantee that unbalanced current protection equipment, ground electrode circuit burn out detection protection equipment are correctly run, is not influenced by arrester direct-to-ground capacitance.

Description

A kind of extra-high voltage direct current ground electrode circuit guard system
Technical field
The present invention relates to a kind of guard system, in particular to a kind of extra-high voltage direct current ground electrode circuit thunder and lightning and operated Voltage protection system.
Background technique
Existing ± 800kV and ± 1000kV extra-high voltage direct current ground electrode circuit generally use insulator chain parallel connection arcing horn Mode prevent thunder and lightning and switching overvoltage from damaging to route;The air gap of extra-high voltage direct current ground electrode circuit and insulation The long thunder and lightning cooperation coefficient of substring is 0.7~0.85.Under lightning stroke or under switching overvoltage, arcing horn is dodged prior to insulator chain Network allows DC operation afterflow to flow through arcing horn, and is not passed through insulator chain, and electric arc is avoided to burn out insulator chain, falls string, and Be conducive to the DC current blow-out on arcing horn.
But the flash-over characteristic of arcing horn and flow through operation DC current after extinguishing characteristic influenced by environmental factor it is very big, It is unstable.Under the bipolar method of operation, when monopole is because of lightning stroke ground fault, perfects pole and switch to the monopole the earth method of operation, if ground connection Polar curve road leads to arcing horn flashover by direct lightning strike and inductive lightning, then DC operation electric current can flow through arcing horn, because of DC operation Electric current is difficult to blow-out without zero crossing, arcing horn, need to execute quick stoppage in transit, is latched both ends inverter, and cutting flows through the straight of arcing horn After galvanic electricity stream, then restart.
In area populous, more than AC Substation, is limited by corridor and ground electrode circuit sets up address choice and is stranded Difficult influence, ± 800kV and ± 1000kV DC line may be joint used with ground electrode circuit, the polar curve joint used with connect Earth polar route is close coupling route.When bipolar operation, if wherein any one polar curve will be along polar curve by thunderbolt, thunder and lightning traveling wave It travels to and joint uses section, since dielectric level is lower on ground electrode circuit, thunder and lightning traveling wave is excessively electric in the induction of ground electrode circuit Pressure can lead to many places arcing horn flashover on ground connection polar curve;When route tower top or aerial earth wire are joint used in thunder and lightning direct attack, flow through The lightning current that shaft tower enters ground may also lead to arcing horn counterattack flashover, therefore, the ground electrode circuit lightning stroke flashover probability joint used The case where individually being set up much higher than ground electrode circuit.
When bipolar operation, if thunderbolt or counterattack cause a polar curve that ground fault occurs, perfecting on the polar curve of pole will Switching overvoltage is induced, switching overvoltage traveling wave, which can be transmitted to, joint uses section, and through electromagnetism and capacitive coupling in earthing pole Higher switching overvoltage is induced on line, and ground connection event is occurred with section polar curve is joint used with Inverter Station high end converter transformer valve side especially After barrier, the switching overvoltage highest generated on ground electrode circuit, this switching overvoltage can lead to arcing horn flashover.Operation warp Test show ± 800kV ground electrode circuit repeatedly because arcing horn flashover cause monopole even bipolar locking, or occur arcing horn cannot Blow-out sustained combustion is until arcing horn is burnt, insulator chain falls the major break down of string.
Summary of the invention
In order to solve the above-mentioned deficiency in the presence of the prior art, the present invention provides a kind of extra-high voltage direct current ground electrode circuit Guard system.
Present invention provide the technical scheme that a kind of extra-high voltage direct current ground electrode circuit guard system, including shaft tower ontology, Lightning conducter cross-arm and ground connection polar conductor cross-arm on the shaft tower ontology, lightning conducter cross-arm both ends are fixed lightning-arrest respectively Line, ground connection polar conductor cross-arm both ends pass through insulator S1 and insulator S2 dead earth polar conductor, improvements respectively Be: the ground connection polar conductor is connect with the connecting pin of the insulator S1 with one end of clearance C 1, the ground connection polar conductor with The connecting pin of the insulator S2 is connect with one end of clearance C 2, the other end of the other end of the clearance C 1 and clearance C 2 with One end of arrester connects, and the other end of the arrester is connected with shaft tower ontology.
Preferably, the shaft tower ontology, the lightning conducter cross-arm and the ground connection polar conductor cross-arm are truss of angle steel, institute It states lightning conducter cross-arm and is higher than and is parallel to the ground connection polar conductor cross-arm, the lightning conducter cross-arm and the ground connection polar conductor cross-arm Vertical perpendicular bisector be overlapped with the axis of the shaft tower ontology.
Preferably, the shaft tower ontology is equipped with for fixing the lightning conducter cross-arm and the ground connection polar conductor cross-arm Aperture and the shaft tower ontology upper installing hole are equipped on mounting hole, the lightning conducter cross-arm and the ground connection polar conductor cross-arm The screw hole that aperture is equal to each other;The lightning conducter cross-arm and the ground connection polar conductor cross-arm pass through through the mounting hole and described The bolt of screw hole is fixed on the shaft tower ontology.
Preferably, the both ends of the lightning conducter cross-arm have the fixation hole for fixing lightning conducter wire clamp;It is described to keep away The screw hole that thunder line wire clamp is equal to each other equipped with the aperture in aperture and fixation hole, the lightning conducter wire clamp, which passes through, runs through the fixation The bolt of hole and the screw hole is fixed on the lightning conducter cross-arm both ends;The lightning conducter passes through lightning conducter wire clamp level side To being vertically fixed on lightning conducter cross-arm both ends.
Preferably, the insulator is suspension insulator, and one end of the suspension insulator is equipped with insulator hardware, another End is equipped with wire clamp;The insulator hardware and ground connection polar conductor cross-arm both ends are respectively equipped with the corresponding screw hole of size, described Insulator metal is fixed on ground connection polar conductor cross-arm both ends by screw bolt and nut;The wire clamp clamps the earthing pole and leads Line.
Preferably, the arrester is suspended-type surge arrester;The high-voltage end and low-pressure end of the arrester are equipped with lightning-arrest Device fitting;
The arrester fitting of low-pressure end includes rectangular metallic plate, is respectively perpendicular set on the rectangular metallic plate both ends Connecting plate and metal wire clamp;
The truss of angle steel of the connecting plate and the shaft tower ontology is equipped with the screw hole that size is equal to each other, the connecting plate By being fixed through the screw bolt and nut of the screw hole with the shaft tower ontology, the screwhole position on the shaft tower ontology be lower than or Equal to the height of the ground connection polar conductor cross-arm;The metal wire clamp is fixed with the arrester low-pressure end.
Preferably, described gap one end by insulator wire clamp with ground connection polar conductor connect, the other end pass through hard conducting wire and The fitting of arrester high-voltage end connects.
Preferably, the spacing in the gap is extra-high voltage direct current ground electrode circuit in a manner of monopole the earth and overload mode When operation, pressure drop of the gap under overload DC current length corresponding when not generating corona.
Further, the distance between arrester and shaft tower ontology are greater than the spacing in the gap.
Compared with immediate technical solution, the present invention has following marked improvement:
(1) in parallel with insulator after the technical program intermediate gap is connected with suspended-type surge arrester, due to suspended-type surge arrester Effect flowed through in gap even if individually setting up or joint using ground electrode circuit flashover ground with polar curve and lead to gap breakdown DC operation electric current can also reduce quickly, solve the problems, such as that arcing horn is difficult to blow-out when DC operation electric current flows through, subtract Few extra-high voltage direct current ground electrode circuit leads to the monopole even accident of bipolar locking because of arcing horn flashover.
(2) in the technical program select suspended-type surge arrester make arrester easier for installation on shaft tower, gap with Suspended-type surge arrester high-voltage end is connected, and when operating normally, not will receive the effect of direct-current working volts on suspended-type surge arrester, Extend the service life of arrester.
(3) two sides ground connection polar conductor is separately connected one end of clearance C 1 and one end of clearance C 2, gap in the technical program The other end of C1 and the other end of clearance C 2 are connect with one end of arrester, and the other end of arrester is connected with shaft tower ontology, An arrester, which can be achieved, can protect two ground electrode circuits, guarantee unbalanced current protection equipment, ground electrode circuit broken string Detection protection equipment is correctly run, and is not influenced by arrester direct-to-ground capacitance.
(4) low-pressure end of arrester is fixed by the arrester fitting of low-pressure end with shaft tower ontology, it is ensured that suspension type is kept away When thunder device is run in a manner of monopole the earth at a distance from shaft tower ontology greater than extra-high voltage direct current ground electrode circuit, gap is in overload Pressure drop under DC current does not generate spacing corresponding when corona, to guarantee arrester after gap punctures in case of a fault High-voltage end will not discharge to shaft tower ontology.
(5) gap is connected by hard conducting wire with arrester, it is ensured that connecting wire is not swung with the wind, it is ensured that when normal operation The relative distance of hard conducting wire and other component.
Detailed description of the invention
Fig. 1 is the structure principle chart of extra-high voltage direct current ground electrode circuit guard system provided by the invention.
Fig. 2 is the catenation principle figure of arrester low-pressure end and shaft tower ontology.
Fig. 3 is insulator and the catenation principle figure for being grounded polar conductor and gap.
Wherein: 1- shaft tower ontology;2- lightning conducter cross-arm;3- lightning conducter;4- is grounded polar conductor cross-arm;5- insulator;6- connects Ground polar conductor;7- arrester;The truss of angle steel of 8- shaft tower ontology;9- nut;10- bolt;The arrester fitting of 11- low-pressure end; 12- insulator wire clamp;The gap 13-.
Specific embodiment
For a better understanding of the present invention, the contents of the present invention are done further with example with reference to the accompanying drawings of the specification Explanation.
Extra-high voltage direct current ground electrode circuit guard system provided by the invention as shown in Figure 1, be mainly used for prevent thunder and lightning and Switching overvoltage damages extra-high voltage direct current ground electrode circuit;Guard system includes the shaft tower ontology 1 set up vertically, is set to On the shaft tower ontology 1 and lightning conducter cross-arm 2 that vertical perpendicular bisector is overlapped with 1 axis of shaft tower ontology and it is grounded polar conductor cross Load 4;Wherein lightning conducter cross-arm 2 is higher than and is parallel to ground connection polar conductor cross-arm 4;
4 both ends of ground connection polar conductor cross-arm pass through insulator S1 and insulator S2 dead earth polar conductor 6 respectively, described Ground connection polar conductor 6 is connect with the connecting pin of the insulator S1 with one end of clearance C 1, the ground connection polar conductor 6 and the insulation The connecting pin of sub- S2 is connect with one end of clearance C 2, the other end of the other end of the clearance C 1 and clearance C 2 with arrester 7 One end connection, the other end of the arrester 7 is connected with shaft tower ontology 1;Clearance C 1 and C2 are the air gap, when electricity occurred When pressure, the air between gap can be breakdown, and after breakdown, gap is connected with arrester 7, prevents insulator S1 and S2 by electricity Crushing evil;This connection type, which can be realized, protects two ground electrode circuits with an arrester 7, guarantees that unbalanced current protection is set Standby, ground electrode circuit burn out detection protection equipment is correctly run, and is not influenced by 7 direct-to-ground capacitance of arrester.
The shaft tower ontology 1, the lightning conducter cross-arm 2 and the ground connection polar conductor cross-arm 4 are truss of angle steel, the bar The truss of angle steel 8 of tower ontology is equipped with the mounting hole for fixing the lightning conducter cross-arm 2 and the ground connection polar conductor cross-arm 4, The aperture in aperture Yu 1 upper installing hole of shaft tower ontology is equipped on the lightning conducter cross-arm 2 and the ground connection polar conductor cross-arm 4 The screw hole being equal to each other;The lightning conducter cross-arm 2 and the ground connection polar conductor cross-arm 4 are by running through the mounting hole and the spiral shell The bolt in hole is fixed on the shaft tower ontology 1.
The both ends of the lightning conducter cross-arm 2 have the fixation hole for fixing lightning conducter wire clamp;The lightning conducter line The screw hole that folder is equal to each other equipped with the aperture in aperture and fixation hole, the lightning conducter wire clamp, which passes through, runs through the fixation hole and institute The bolt for stating screw hole is fixed on 2 both ends of lightning conducter cross-arm;The lightning conducter wire clamp steps up lightning conducter 3,3 water of lightning conducter Square to being vertically fixed on 2 both ends of lightning conducter cross-arm.
The arrester 7 is suspended-type surge arrester, so that arrester 7 is easier for installation on shaft tower;The arrester 7 High-voltage end and low-pressure end be equipped with arrester fitting;7 high-voltage end of arrester is connected by arrester fitting with gap 13, just Often when operation, it not will receive the effect of direct-current working volts on suspended-type surge arrester, extend the service life of arrester 7.
As shown in Figure 2: the arrester fitting 11 of low-pressure end includes rectangular metallic plate, is respectively perpendicular set on the rectangle The connecting plate and metal wire clamp of metal board ends;
The truss of angle steel 8 of the connecting plate and the shaft tower ontology is equipped with the screw hole that size is equal to each other, the connection Plate is fixed by bolt 10 through the screw hole and nut 9 and the shaft tower ontology 1, the screw hole position on the shaft tower ontology 1 Set the height less than or equal to the ground connection polar conductor cross-arm 4;The metal wire clamp is fixed with 7 low-pressure end of arrester.
The low-pressure end of arrester 7 is fixed by the arrester fitting 11 and shaft tower ontology 1 of low-pressure end, it is ensured that suspension type is kept away When thunder device 7 is run in a manner of monopole the earth at a distance from shaft tower ontology 1 greater than extra-high voltage direct current ground electrode circuit, gap 13 is in mistake Pressure drop under load DC current does not generate spacing corresponding when corona, to guarantee that gap 13 punctures in case of a fault Afterwards, the high-voltage end of arrester 7 will not discharge to shaft tower ontology 1.
The spacing in the gap 13 is that extra-high voltage direct current ground electrode circuit is run in a manner of monopole the earth with overload mode When, pressure drop of the gap 13 under overload DC current length corresponding when not generating corona.
As shown in Figure 3: the insulator 5 is suspension insulator, and one end of the suspension insulator is equipped with insulator hardware, The other end is equipped with wire clamp;The insulator hardware and 4 both ends of ground connection polar conductor cross-arm are respectively equipped with the corresponding screw hole of size, The insulator metal is fixed on 4 both ends of ground connection polar conductor cross-arm by screw bolt and nut;
The wire clamp clamps the ground connection polar conductor 6 and connects the one end in the gap 13, the other end in the gap 13 It is connect by hard conducting wire with the fitting of 7 high-voltage end of arrester, it is ensured that connecting wire is not swung with the wind, it is ensured that hard when normal operation The relative distance of conducting wire and other component.
The voltage rating of the arrester 7 is determined by following steps:
Step 1: establishing Simulation Calculation and calculate the highest and lowest converter transformer valve side generation of the change of current change flashover, commutation over the ground Switching overvoltage or thunderbolt or counterattack ground electrode circuit are generated in ground electrode circuit when ground fault along failure or route When generating the failure of overvoltage, the thunder and lightning and switching-surge protective level of arrester;
Step 2: carrying out Insulation Coordination selection insulator chain the air gap and protection of arrester is horizontal;
Step 3: corresponding arrester voltage rating is selected according to protection of arrester level and neutral bus voltage rating.
The above is only the embodiment of the present invention, are not intended to restrict the invention, all in the spirit and principles in the present invention Within, any modification, equivalent substitution, improvement and etc. done are being applied within pending scope of the presently claimed invention.

Claims (9)

1. a kind of extra-high voltage direct current ground electrode circuit guard system, lightning-arrest including shaft tower ontology, on the shaft tower ontology Lightning conducter, the ground connection polar conductor cross-arm two are fixed in line cross-arm and ground connection polar conductor cross-arm, lightning conducter cross-arm both ends respectively End passes through insulator S1 and insulator S2 dead earth polar conductor respectively, it is characterised in that: the ground connection polar conductor and described exhausted The connecting pin of edge S1 is connect with one end of clearance C 1, the connecting pin and clearance C 2 of the ground connection polar conductor and the insulator S2 One end connection, the other end of the clearance C 1 and the other end of clearance C 2 connect with one end of arrester, the arrester The other end be connected with shaft tower ontology.
2. a kind of extra-high voltage direct current ground electrode circuit guard system as described in claim 1, it is characterised in that:
The shaft tower ontology, the lightning conducter cross-arm and the ground connection polar conductor cross-arm are truss of angle steel, and the lightning conducter is horizontal Load is higher than and is parallel to the ground connection polar conductor cross-arm, the lightning conducter cross-arm and the ground connection polar conductor cross-arm it is vertical in it is vertical Line is overlapped with the axis of the shaft tower ontology.
3. a kind of extra-high voltage direct current ground electrode circuit guard system as described in claim 1, it is characterised in that:
The shaft tower ontology is equipped with the mounting hole for fixing the lightning conducter cross-arm and the ground connection polar conductor cross-arm, described Aperture phase corresponding with the aperture of the shaft tower ontology upper installing hole is equipped on lightning conducter cross-arm and the ground connection polar conductor cross-arm Deng screw hole;The lightning conducter cross-arm and the ground connection polar conductor cross-arm pass through the bolt through the mounting hole and the screw hole It is fixed on the shaft tower ontology.
4. a kind of extra-high voltage direct current ground electrode circuit guard system as described in claim 1, it is characterised in that:
The both ends of the lightning conducter cross-arm have the fixation hole for fixing lightning conducter wire clamp;It is set on the lightning conducter wire clamp The screw hole for having the aperture of aperture and fixation hole to be equal to each other, the lightning conducter wire clamp is by running through the fixation hole and the screw hole Bolt be fixed on lightning conducter cross-arm both ends;The lightning conducter is vertically fixed on by the lightning conducter wire clamp horizontal direction Lightning conducter cross-arm both ends.
5. a kind of extra-high voltage direct current ground electrode circuit guard system as described in claim 1, it is characterised in that:
The insulator is suspension insulator, and one end of the suspension insulator is equipped with insulator hardware, and the other end is equipped with wire clamp; The insulator hardware and ground connection polar conductor cross-arm both ends are respectively equipped with the corresponding screw hole of size, and the insulator hardware is logical It crosses screw bolt and nut and is fixed on ground connection polar conductor cross-arm both ends;The wire clamp clamps the ground connection polar conductor.
6. a kind of extra-high voltage direct current ground electrode circuit guard system as described in claim 1, it is characterised in that:
The arrester is suspended-type surge arrester;The high-voltage end and low-pressure end of the arrester are equipped with arrester fitting;
The arrester fitting of low-pressure end includes rectangular metallic plate, is respectively perpendicular the connection set on the rectangular metallic plate both ends Plate and metal wire clamp;
The truss of angle steel of the connecting plate and the shaft tower ontology is equipped with the screw hole that size is equal to each other, and the connecting plate passes through Screw bolt and nut through the screw hole is fixed with the shaft tower ontology, and the screwhole position on the shaft tower ontology is less than or equal to The height of the ground connection polar conductor cross-arm;The metal wire clamp is fixed with the arrester low-pressure end.
7. a kind of extra-high voltage direct current ground electrode circuit guard system as described in claim 1, it is characterised in that:
Described gap one end is connect by insulator wire clamp with ground connection polar conductor, and the other end passes through hard conducting wire and arrester high-voltage end Fitting connection.
8. a kind of extra-high voltage direct current ground electrode circuit guard system as described in claim 1, it is characterised in that:
The spacing in the gap is extra-high voltage direct current ground electrode circuit in a manner of monopole the earth and when overload mode is run, gap Pressure drop under overload DC current length corresponding when not generating corona.
9. a kind of extra-high voltage direct current ground electrode circuit guard system as claimed in claim 8, it is characterised in that:
The distance between arrester and shaft tower ontology are greater than the spacing in the gap.
CN201510345132.2A 2015-06-19 2015-06-19 A kind of extra-high voltage direct current ground electrode circuit guard system Active CN104882876B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105958464A (en) * 2016-05-30 2016-09-21 中国电力工程顾问集团中南电力设计院有限公司 EHV (extra-high voltage) DC grounding electrode circuit insulation coordination method
CN105932547B (en) * 2016-06-22 2017-11-10 国网四川省电力公司电力科学研究院 A kind of ground electrode circuit condenser type is released can inter space device
CN109193579B (en) * 2018-08-29 2022-04-15 中国电力科学研究院有限公司 Method and system for determining an operating overvoltage in a direct current network line

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101699573A (en) * 2009-10-24 2010-04-28 山东迅实电气有限公司 Lightning arrester insulator for overhead wire insulated conductor
CN202280279U (en) * 2011-08-19 2012-06-20 中国电力工程顾问集团华东电力设计院 Steel tube tower for UHV (ultra-high voltage) transmission line
CN203503405U (en) * 2013-10-22 2014-03-26 国家电网公司 Lightning arrester device
CN104682311A (en) * 2013-11-29 2015-06-03 国家电网公司 Lightning protection overhead line

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101699573A (en) * 2009-10-24 2010-04-28 山东迅实电气有限公司 Lightning arrester insulator for overhead wire insulated conductor
CN202280279U (en) * 2011-08-19 2012-06-20 中国电力工程顾问集团华东电力设计院 Steel tube tower for UHV (ultra-high voltage) transmission line
CN203503405U (en) * 2013-10-22 2014-03-26 国家电网公司 Lightning arrester device
CN104682311A (en) * 2013-11-29 2015-06-03 国家电网公司 Lightning protection overhead line

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