CN202042865U - Earthing device of power transmission line of composite pole tower - Google Patents
Earthing device of power transmission line of composite pole tower Download PDFInfo
- Publication number
- CN202042865U CN202042865U CN2011200206966U CN201120020696U CN202042865U CN 202042865 U CN202042865 U CN 202042865U CN 2011200206966 U CN2011200206966 U CN 2011200206966U CN 201120020696 U CN201120020696 U CN 201120020696U CN 202042865 U CN202042865 U CN 202042865U
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- earth
- transmission line
- insulator
- pole tower
- power transmission
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Abstract
The utility model provides an earthing device for a power transmission line of a composite pole tower. An earth wire cross arm is mounted at the top end of a composite pole tower body, the upper end of an earth wire is connected with the earth wire cross arm, and the earth wire suspends from the middle of the composite pole tower body to be connected with the earth. The earthing device is characterized in that an insulator is mounted between the earth wire and the earth, and the height of the insulator to the earth is more than 2.5 meters. Since the insulator is mounted between the earth wire and the earth, when lighting stoke does not occur, the earth wire is disconnected with the earth and has no induced electric field at the time, the line is in normal operation without current flowing and loss of an overhead grounding wire is reduced. When the power transmission line is subjected to lighting stroke, the insulator serially connected with the earth wire is punctured rapidly by the lighting voltage to lead the earth wire to be connected with the earth, and lighting current discharged into the earth rapidly, so that the voltage of the power transmission line is reduced rapidly and lightning protection is realized.
Description
Technical field
The utility model relates to electric power transmission line, particularly relates to composite material pole tower transmission line earthing device.
Background technology
Along with development of material technology, the application of composite material aspect shaft tower more and more widely, the composite material pole tower of various versions also is applied to transmission line gradually.
Transmission line has induced voltage on the insulation lightning conducter when normal operation, it is made up of two parts: electromagnetic induction voltage and electrostatic induction voltage.Electromagnetic induction voltage is produced on lightning conducter by the electromagnetic coupled between lead, lightning conducter by load current on the power transmission sequence.Electrostatic induction voltage is because every lightning conducter is asymmetric in the physical dimension in space to three-phase conducting wire, high-voltage conducting wires produces the voltage to earth that high voltage electric field causes to its surrounding space, also is power line and lightning conducter capacitive coupling and the electrostatic induction voltage that produces on lightning conducter.
If lightning conducter is on-insulated and ground connection step by step, help the operating maintenance of circuit.But because the electromotive force that electromagnetic induction produces just constitutes the loop, produce electric current, cause energy loss.And this energy loss can be divided into two parts, the first is not because the electromagnetic induction electromotive force of two lightning conducters waits (when lead, lightning conducter symmetric arrangement, its absolute value equates, but phase angle is unequal), so between two lightning conducters, can form circulation, cause circulation component energy loss between line.It two is that lightning conducter is the faradic loss in loop with the earth, becomes component energy loss in the ground.
Because the lightning conducter of the transmission line that the 110kV electric pressure is above must pursue basic ground connection, just effectively reduce the tripping rate with lightning strike of circuit, therefore, for the earthing mode of composite material bar, effectively utilize on the basis of composite material bar insulating properties in assurance, need make the lightning conducter effective grounding of circuit.This just brings the problem of lightning conducter loss.Therefore, be necessary a kind of suitable earthing mode of the loss of ground connection step by step Study on Problems at composite material pole tower.
Publication number is a kind of grounding method for composite insulating pole tower of power transmission line of CN101692572A and the patent of shaft tower thereof, the shaft tower main body adopts insulating composite material tubing, the lead cross-arm adopts composite insulator, the ground wire cross-arm adopts metallic conductor, down conductor adopts metal wire rod or tubing or bar, down conductor is from the middle unsettled ground connection down of drawing of tubing, on ground wire cross-arm and the lead cross-arm metal electrode is housed, the down conductor extraction electrode is installed in suitable position punching at shaft tower additional, can be according to the lightning protection requirement, determine the air gap distance between ground wire lateral electrode and the lead lateral electrode, and the air gap distance between down conductor extraction electrode and the lead.The direct ground connection of this grounding method for composite insulating pole tower of power transmission line does not solve the faradic loss that lightning conducter is the loop with the earth.
Summary of the invention
The purpose of this utility model provides a kind of composite material pole tower transmission line earthing device, and this device can reduce the lightning conducter loss.
In order to achieve the above object, composite material pole tower transmission line earthing device of the present utility model, comprise ground wire cross-arm and earth connection, the ground wire cross-arm is installed in composite material pole tower body top, the earth connection upper end is connected with the ground wire cross-arm, earth connection unsettled drawing down in the middle of composite material shaft tower body is connected with the earth, it is characterized in that: between earth connection and the earth insulator is installed.
Owing between earth connection and the earth insulator is installed, when thunderbolt not taking place, earth connection does not link to each other with the earth, and do not have induction field on the earth connection this moment, and no current flow through when circuit normally moved, and had reduced the lightning conducter loss.When transmission line is struck by lightning, earth connection institute insulator string will puncture rapidly under lightning voltage makes earth connection and the earth connect, and makes lightning current leak into the earth rapidly, thereby line voltage distribution is reduced rapidly, plays the lightning protection effect.
Described composite material pole tower transmission line earthing device is characterized in that: insulator to the height of the earth more than 2.5 meters.When circuit normally moves, earth connection that insulator is above and the earth insulation, circuit operation meeting causes induced voltage on the earth connection above the insulator, the direct ground connection of ground wire of insulator below, be earth potential, 2.5 the above degree degree of rice is higher than the person and lifts the arm height, thereby even make under the impaired situation of composite material pole tower earth connection below 2.5 meters insulation, also can not make the ground pedestrian influenced by this induced voltage.
Composite material pole tower transmission line earthing device of the present utility model can reduce the lightning conducter loss.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
The explanation of Fig. 1 mark: ground wire cross-arm 1, composite material pole tower body 2, earth connection 3, insulator 4, the earth 5.
Referring to Fig. 1, the embodiment of the utility model composite material pole tower transmission line earthing device installs ground wire cross-arm 1 at composite material pole tower body 2 tops, earth connection 3 upper ends are connected with ground wire cross-arm 1, earth connection 3 unsettled drawing down in the middle of composite material shaft tower body 2 is connected with the earth 5, between earth connection 3 and the earth 5 insulator 4 is installed.
Owing between earth connection 3 and the earth 5 insulator 4 is installed, when thunderbolt not taking place, earth connection 3 does not link to each other with the earth 5, and do not have induction field on the earth connection 3 this moment, and no current flow through when circuit normally moved, and had reduced the lightning conducter loss.When transmission line is struck by lightning, 3 insulator strings 4 of earth connection will puncture rapidly under lightning voltage makes earth connection 3 and the earth 5 connect, and makes lightning current leak into the earth 5 rapidly, thereby line voltage distribution is reduced rapidly, plays the lightning protection effect.
For the transmission line of 330kV, if with the insulation of two lightning conducters, transmission line is by carrying 300,000 kilowatts of power calculation, and then per hundred kms can reduce about 180,000 degree of energy loss every year.Consider that from the energy savings angle this earthing device has great economic benefit.
Among the embodiment, insulator 4 arrives the height of the earth 5 more than 2.5 meters.When circuit normally moves, the earth connection 3 of insulator more than 4 and the earth 5 insulation, circuit operation meeting causes induced voltage on the earth connection above the insulator 43, the direct ground connection of ground wire of insulator 4 belows, be earth potential, 2.5 the above degree degree of rice is higher than the person and lifts the arm height, thereby even make under the impaired situation of composite material pole tower earth connection below 2.5 meters 3 insulation, also can not make the ground pedestrian influenced by this induced voltage.
Composite material pole tower transmission line earthing device of the present utility model can reduce the lightning conducter loss, and promoting the use of this device has positive meaning to the efficiency of transmission that improves electric power transmission line, the loss that reduces electric power transmission line.
Claims (2)
1. composite material pole tower transmission line earthing device, comprise ground wire cross-arm and earth connection, the ground wire cross-arm is installed in composite material pole tower body top, the earth connection upper end is connected with the ground wire cross-arm, earth connection unsettled drawing down in the middle of composite material shaft tower body is connected with the earth, it is characterized in that: between earth connection and the earth insulator is installed.
2. composite material pole tower transmission line earthing device according to claim 1 is characterized in that: insulator to the height of the earth more than 2.5 meters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200206966U CN202042865U (en) | 2011-01-24 | 2011-01-24 | Earthing device of power transmission line of composite pole tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200206966U CN202042865U (en) | 2011-01-24 | 2011-01-24 | Earthing device of power transmission line of composite pole tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202042865U true CN202042865U (en) | 2011-11-16 |
Family
ID=44970291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200206966U Expired - Lifetime CN202042865U (en) | 2011-01-24 | 2011-01-24 | Earthing device of power transmission line of composite pole tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202042865U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350462A (en) * | 2019-06-24 | 2019-10-18 | 广西电网有限责任公司电力科学研究院 | A kind of intelligent lightning protecting distribution line shaft tower |
| CN113893475A (en) * | 2021-10-13 | 2022-01-07 | 成都信息工程大学 | Lightning wood drainage fireproof method and device |
-
2011
- 2011-01-24 CN CN2011200206966U patent/CN202042865U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350462A (en) * | 2019-06-24 | 2019-10-18 | 广西电网有限责任公司电力科学研究院 | A kind of intelligent lightning protecting distribution line shaft tower |
| CN113893475A (en) * | 2021-10-13 | 2022-01-07 | 成都信息工程大学 | Lightning wood drainage fireproof method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111116 |
|
| CX01 | Expiry of patent term |