CN206237105U - The lightning protection deicing device of ground wire on a kind of high pressure overhead power line - Google Patents

The lightning protection deicing device of ground wire on a kind of high pressure overhead power line Download PDF

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Publication number
CN206237105U
CN206237105U CN201621255049.2U CN201621255049U CN206237105U CN 206237105 U CN206237105 U CN 206237105U CN 201621255049 U CN201621255049 U CN 201621255049U CN 206237105 U CN206237105 U CN 206237105U
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lightning protection
ground wire
steel tower
insulator
power line
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CN201621255049.2U
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Chinese (zh)
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张健
张京伦
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张兴莲
张京伦
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Abstract

The utility model is related to a kind of lightning protection deicing device of ground wire on high pressure overhead power line.The purpose of this utility model is intended to comprehensive solve the problems, such as to currently take place on ground wire so that aerial earth wire can either lightning protection, can also carry the functions such as telecommunication optical fiber, ice-melt snow removing, saving energy and decreasing loss and field power taking secretly.The technical solution of the utility model is:The lightning protection deicing device of ground wire on high pressure overhead power line, with the ground wire being set up on steel tower, insulator is connected between steel tower and ground wire, the ground wire is made up of inner conductor, insulating barrier and outer contact, inner conductor is directly connected with steel tower, and outer contact is connected through insulator with steel tower;The lightning protection unit of tower bottom, the other end ground connection of lightning protection unit are connected and installed between the outer contact and insulator by high pressure connection cable;Bridging has lightning protection unit and the shunt reactor on the lightning protection unit between the insulator of steel tower both sides.The utility model is applied to the safety and energy-conservation of circuit on power system engineering.

Description

The lightning protection deicing device of ground wire on a kind of high pressure overhead power line
Technical field
The utility model is related to a kind of lightning protection deicing device of ground wire on high pressure overhead power line.Suitable for power system The safety and energy-conservation of line project.
Background technology
As shown in figure 1, it is one of most basic lightning protection measures of power transmission sequence, ground wire to set lightning protection ground wire in transmission line of electricity restocking There are following functions in terms of lightning protection:1) prevent thunder from attacking wire directly;2) shunting action is played to lightning current during lightning stroke rate, is reduced The lightning current of steel tower is flowed into, makes the reduction of tower top current potential;3) there is shielding action to wire, can be reduced on wire when thunder and lightning cloud is invaded Induced overvoltage.In addition to above-mentioned effect, with the development of modern communicationses, fiber optic communication has been widely used ground wire, will be logical It is a very economical and effective method that letter optical fiber is attached to aerial earth wire.Although the effect of aerial earth wire is so big, Be in actual applications find there are problems that it is many, such as:
1), because ground wire is typically all erected on tower top, icing is more readily formed in the winter time, once ice sheet is blocked up, it will Shaft tower is caused to fall down to the ground, ground thread breakage is led, short circuit grounding, the situation of whole piece circuit interruption of power supply between ground wire.
2), in overhead transmission line, because ground wire is usually unequal to the distance of each phase conductor, the mutual inductance between them Also difference is had, although the load current on three-phase conducting wire is balance under normal circumstances, is still to induce on ground wire One longitudinal electromotive force, if ground wire is that if each steel tower is grounded, this electromotive force will produce electric current to flow into the earth, its knot Fruit is just the increase in the energy loss of circuit.According to measuring and calculating, this additional energy loss is the quadratic sum line with same load current Road length is proportional, and the power transmission sequence of 200-300km long for 220kV, this parasitic power loss there are about hundreds of thousands every year Degree, and the power transmission sequence of 300-400km long for 500kV, about lose ten thousand degree of electricity of 500-600 every year, and this is considerable Loss.
For above mentioned problem, it is thought that to aerial earth wire carry out Insulation Transformation, the insulation mode for using at present be Install insulator 6 on ground wire additional, Fig. 2, Fig. 3 are two kinds of conventional insulators, and both insulators all have two between electric discharge The metal bar of gap, general discharging gap is 10-40mm (what is had reaches 100mm).After installing insulator additional, ground wire is in normal condition Lower is insulation with the earth, and dc source can be loaded to ground wire when icing is serious, makes ground wire heating up, reaches ice-melt mesh 's.And when thunder and lightning occurs, first puncture the gap of insulator in thunder and lightning pioneer discharge regime and make ground wire in ground state, this is just Solve above-mentioned first problem.After ground wire is by overhead insulating, eliminate ground wire induced electromotive force over the ground, it is to avoid huge Electric energy loss, that is, solve above-mentioned Second Problem.
Although aerial earth wire have passed through above-mentioned transformation, applicant has had found weak point:
3), because ground wire is generally, by tower ground connection or graded insulation one point earth, in actual motion, to find exhausted Under the conditions of icing, insulator average flashover severity voltage is respectively 12.6~13.5kV to edge 6 when ice covering thickness is 10mm and 20mm With 9.0~12.0kV, far below cleaning insulator average flashover severity voltage (24.6~28.5kV), it is seen then that covering ice for insulator and Staining can all reduce its flashover voltage.
4), aerial earth wire completely insulate in the case of, if the air gap of insulator be 100mm, when thunderbolt ground wire and When the air gap is not breakdown, it is possible to find now the overvoltage in tower top is greater than excessively electric when ground wire is normally connected with steel tower Pressure, especially over-voltage waveform wave head partly.Its reason be because the air gap between ground wire and steel tower is not breakdown, Thunder energy is postponed and discharged downwards bigly, so that overvoltage wave head part steepening, the raising of overvoltage degree, cause circuit Lightning protection capability declines.And if discharging gap is too small, insulator is frequently struck sparks electric discharge, also insulator can be caused to damage.
5), under normal circumstances, the electric-field intensity around aerial earth wire can be bigger than the electric-field intensity on transmission pressure, under thunder and lightning When row guide arrives, the aerial earth wire on steel tower takes the lead in discharging and produces the guide that heads on, so it is prevented that transmission line of lightning strike Cause line fault.But, in order to reduce the electric energy loss on ground wire, if ground wire is completely insulated, under this wiring, make somebody a mere figurehead ground Field intensity on line can be less than the electric-field intensity on transmission pressure, when thunder and lightning descending leader arrives, if can not puncture aerial earth wire with The air gap between shaft tower cause it is ground wire grounded if, because the electric-field intensity on now transmission pressure is more than ground wire field intensity, Transmission pressure is turned into head-on guide, produce thunderbolt shielding, and do not reach lightning protection effect and cause transmission line malfunction, system is pacified Full stable operation produces considerable influence.
The content of the invention
The technical problems to be solved in the utility model is:For above-mentioned a variety of situations, there is provided a kind of high voltage overhead line The lightning protection deicing device of ground wire on road, it is intended to comprehensive to solve the problems, such as to currently take place on ground wire so that aerial earth wire was both Can lightning protection, can also carry the functions such as telecommunication optical fiber, ice-melt snow removing, saving energy and decreasing loss and field power taking secretly.
The technical scheme that the utility model is used is:The lightning protection deicing device of ground wire on high pressure overhead power line, tool Have the ground wire being set up on steel tower, insulator be connected between steel tower and ground wire, it is characterised in that the ground wire by inner conductor, Insulating barrier and outer contact are constituted, and inner conductor is directly connected with steel tower, and outer contact is connected through insulator with steel tower;It is described outer The lightning protection unit of tower bottom, the other end of lightning protection unit are connected and installed between layer conductor and insulator by high pressure connection cable Ground connection;Bridging has lightning protection unit and the shunt reactor on the lightning protection unit between the insulator of steel tower both sides;
The lightning protection unit is made up of magnetic arrester FZ and capacitor C;
The bottom of each steel tower, the power taking transformer in parallel on the lightning protection unit of its side.
The inner conductor embeds telecommunication optical fiber.
The reactor is made up of iron core and high-tension coil with air gap.
The power taking transformer is appendiron core transformer of the double winding with small air gap, one end of the primary coil of power taking transformer It is connected with the outer contact, other end ground connection;The secondary coil connection load of power taking transformer.
The high pressure connection cable is the cable that the pressure-resistant crosslinked polyethylene wire-core for being not less than 10kV is conductor.
The insulator is high pressure plate-shaped suspension type ground wire special isolation, is formed by 1~3 disc insulator concatenation, material Expect to be fiberglass or ceramics, the air gap with 10~100mm.
The arrester FZ is outdoor type magnetic high-voltage Zinc-Oxide Arrester.The capacitor C is high voltage capacitor group, The class of insulation is designed by 10~25kV.
The beneficial effects of the utility model are:
1st, due to the presence of insulating barrier, aerial earth wire outer contact is in high potential state under normal circumstances, reduces The electric energy loss of ground wire, and come interim in thunder and lightning, the structure of the double-layer conductor+insulating barrier of this ground wire is served equivalent to electric capacity again The effect of device, can enter the earth by lightning wave in magnetic circuit mode rapidly;The power taking transformer in the present apparatus can also be induced simultaneously Guide makes ground wire outer layer 1-3 discharge, and to protect phase conductor shielding to endanger, the danger being struck by lightning to transmission line of electricity is prevented in many ways Evil.
2nd, by the Insulation Transformation to aerial earth wire, when ice damage is met, can be by loading dc source and through reactor Bridging connection segmentation ground wire, melts the ice and snow of outer layer 1-3 on ground wire, fast recovery of power supply in time.
3rd, after the operation of aerial earth wire state of insulation, electric energy loss can be greatly reduced, realizes the purpose of wastage reducing and energy saving.
4th, secondary arc current when usually high potential operation can reduce circuit single-line to ground fault, improve single phase closing into Power, so as to improve the reliability of power supply.
5th, after the present apparatus being installed, a power line with high potential is become equivalent to by the ground wire of overhead insulating, if Any one installs a power transformer additional on online curb line, every can just obtain 3 in 25~50km line lengths~ The power frequency supply of 10kw or so, this power supply is appreciated that and the tail electricity of transmission line of electricity electric energy is used, can made using the electric energy It is the power supply or the night lighting etc. of steel tower of transmission line of electricity supervising device.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model background technology.
Fig. 2, Fig. 3 are respectively the two kinds of insulators of model used in background technology and the utility model.
Fig. 4 is structural representation of the present utility model.
Fig. 5 is electrical schematic diagram of the present utility model.
Fig. 6 is the internal anatomy of the ground wire that the utility model is used.
Fig. 7 is the structure chart of reactor in the utility model.
Fig. 8 is the structure chart of power taking transformer in the utility model.
Specific embodiment
As shown in Figure 4, Figure 5, on the present embodiment high pressure overhead power line ground wire lightning protection deicing device, with being set up in Ground wire 1 on steel tower 5, the ground wire 1 as three layers it is laminating form (shown in Fig. 6), be respectively inner conductor 1-1, insulating barrier 1-2 and Outer contact 1-3, the inner conductor 1-1 of this example is also embedded with telecommunication optical fiber.Inner conductor 1-1 is directly connected with steel tower 5, outward Layer conductor 1-3 (steel tower both sides) is connected by insulator 6 with steel tower 5 respectively.The insulator 6 of outer contact 1-3 and homonymy it Between draw through a high pressure connection cable 7 and be connected to the bottom of steel tower 5, be connected that (steel tower both sides are each with the lightning protection unit 2 installed in tower bottom Have a lightning protection unit), the other end of lightning protection unit ground connection, be also equipped between the high pressure connection cable 7 and steel tower 5 it is multigroup every From insulator 8.
In order that the ground wire 1 of steel tower both sides allows direct current to pass through in ice-melt, and balance steel tower both sides during thunderbolt Electric charge, permission high frequency lightning current pass through and purpose of taking shelter from the thunder, and a lightning protection unit 2 is also bridged between steel tower both sides insulator 6.With this What lightning protection unit 2 was in parallel also has a reactor 3, and reactor 3 is made up of iron core 3-2 and high-tension coil 3-1 with air gap (from the XDJI types reactor produced by Beijing Electrical Equipment Factory), as shown in Figure 7.
The lightning protection unit 2 is made up of magnetic arrester FZ and capacitor C, and arrester FZ is outdoor type magnetic arrester (manufacturer:Hangzhou is in real Science and Technology Ltd., model C T10W/500), capacitor C is high voltage capacitor group, insulate etc. Level is designed by 10~25kV.
For each steel tower 5, power taking transformer 4 (shown in Fig. 8) in parallel, described on the side lightning protection unit 2 of tower bottom Power taking transformer 4 is appendiron core transformer of the double winding with small air gap, one end of the primary coil of power taking transformer 4 and the outer layer Conductor 1-3 is connected, other end ground connection;The secondary coil connection load of power taking transformer 4.
Inner conductor 1-1 and outer contact 1-3 in the utility model cut with scissors by many with magnetic zinc-coated wire System is formed, and insulating barrier 1-2 is crosslinked polyethylene.
The high pressure connection cable 7 is the pressure-resistant twisted polyethylene cable for being not less than 10kV, single (zinc-coated wire) section Product 120mm2, model YLTX-43-22kV-100, the production of Jiaxing Wu Feng cable factories.
The insulator 6 is high pressure plate-shaped suspension type ground wire special isolation, is formed by 1~3 disc insulator concatenation, material Expect to be fiberglass or ceramics, the air gap with 10~100mm.Shown in Fig. 2, Fig. 3 is respectively model XDP-70C types ground Line insulator and model XDP-70CN type ground insulators, are produced by Nanjing electroceramics factory.
Operation principle of the present utility model is:
By the spectrum analysis to lightning wave:The energy of thunder and lightning is concentrated mainly on low frequency part, about more than 90% Thunder energy is distributed in frequency for 1~below 100kHz, as long as this explanation prevents the lightning wave of 100kHz frequencies below from scurrying into, just Can be thunder and lightning wave energy abatement more than 90%, therefore being introduced in the ground configurations electricity container form for designing allows high-frequency electrical to circulate The capacitor crossed has ground-breaking meaning.
The utility model substitutes the built on stilts ground wire of traditional lightning protection with the double-layer conductor Ground wire with insulation ocver with capacitance characteristic;Together When by a power frequency 50HZThe lower lightning protection unit that high impedance value is presented is accessed on the outer contact of ground wire, when ground wire is normally without thunder When being run in the case of hitting, lightning protection unit is presented high impedance and high potential state, because the capacitive reactance of capacitor C in lightning protection unit is to divide 5~10 times or so of the capacitive reactance of the capacitance produced by section overhead transmission line length, this just makes to flow through the electricity of capacitor C (on ground wire) Flow valuve greatly reduces, i.e., close to ground wire is hanging, so equivalent to the current value over the ground reduced produced by aerial earth wire and Loss.And work as thunder and lightning cloud layer and come interim, lightning wave is presented about 1~100kHZHigh frequency electric, according to condenser reactance computing formulaIn formula, f is thunder and lightning wave frequency rate, and c is condenser capacity value, due to frequency f=1~100kHZ, this is for local It is low impedance value for the capacitance characteristic that line is showed, can runs through lightning current and enter the earth.This programme becomes power taking Level of the transformer design into DC resistance less than 4 Ω, as the circuit path of electrostatic induction electric charge, so when thundercloud passes by When, still can be presented descending leading role on aerial earth wire outer layer 1~3, that is, the equipotential value with the earth is connected, and mutually lead Line forms obvious potential difference, thus the head-on leading role of thunder and lightning can be preferentially realized on the outer contact of ground wire, promotes The outer layer 1-3 zinc-coated wire conductive discharges that lightning current takes the lead in aerial earth wire, thunderbolt to powered phase line is prevented so as to reach On lightning protection purpose.

Claims (8)

1. on a kind of high pressure overhead power line ground wire lightning protection deicing device, with the ground wire (1) being set up on steel tower (5), Insulator (6) is connected between steel tower and ground wire, it is characterised in that:The ground wire (1) is by inner conductor (1-1), insulating barrier (1- 2) constituted with outer contact (1-3), inner conductor (1-1) is directly connected with steel tower (5), and outer contact (1-3) is through insulator (6) it is connected with steel tower (5);Tower is connected and installed in by jump lead (7) between the outer contact (1-3) and insulator (6) The lightning protection unit (2) of bottom, the other end ground connection of lightning protection unit;Bridging has lightning protection unit between the insulator (6) of steel tower both sides (2) shunt reactor (3) and on the lightning protection unit;
The lightning protection unit (2) is made up of arrester FZ and capacitor C;
The bottom of each steel tower (5), the power taking transformer (4) in parallel on the lightning protection unit (2) of its side.
2. on high pressure overhead power line according to claim 1 ground wire lightning protection deicing device, it is characterised in that:It is described Inner conductor (1-1) embeds telecommunication optical fiber.
3. on the high pressure overhead power line according to claim 1 or 2 ground wire lightning protection deicing device, it is characterised in that:It is described Reactor (3) is made up of iron core (3-2) and high-tension coil (3-1) with air gap.
4. on the high pressure overhead power line according to claim 1 or 2 ground wire lightning protection deicing device, it is characterised in that:It is described Power taking transformer (4) is appendiron core transformer of the double winding with small air gap, one end of the primary coil of power taking transformer (4) with it is described Outer contact (1-3) is connected, other end ground connection;The secondary coil connection load of power taking transformer (4).
5. on high pressure overhead power line according to claim 3 ground wire lightning protection deicing device, it is characterised in that:It is described draw connect Cable (7) is the pressure-resistant zinc-coated wire leader cable line for being not less than 10kV.
6. on high pressure overhead power line according to claim 1 ground wire lightning protection deicing device, it is characterised in that:The insulation Sub (6) are high pressure plate-shaped suspension type ground wire special isolation, are formed by 1~3 disc insulator concatenation, and material is fiberglass or pottery Porcelain, the electric the air gap of the level with 10~100mm of electric discharge at two ends.
7. on high pressure overhead power line according to claim 1 ground wire lightning protection deicing device, it is characterised in that:It is described lightning-arrest Device FZ is outdoor type magnetic arrester.
8. on high pressure overhead power line according to claim 1 ground wire lightning protection deicing device, it is characterised in that:The electric capacity Device C is high voltage capacitor group, and the class of insulation is designed by 10~25kV.
CN201621255049.2U 2016-11-22 2016-11-22 The lightning protection deicing device of ground wire on a kind of high pressure overhead power line Expired - Fee Related CN206237105U (en)

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CN201621255049.2U CN206237105U (en) 2016-11-22 2016-11-22 The lightning protection deicing device of ground wire on a kind of high pressure overhead power line

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Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106655055A (en) * 2016-11-22 2017-05-10 张兴莲 Lightning protection and deicing device of ground wire on high voltage overhead power transmission line
CN110635211A (en) * 2019-09-05 2019-12-31 夏士桀 Communication iron tower with deicing and hail prevention functions

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106655055A (en) * 2016-11-22 2017-05-10 张兴莲 Lightning protection and deicing device of ground wire on high voltage overhead power transmission line
CN106655055B (en) * 2016-11-22 2018-07-13 张兴莲 The lightning protection deicing device of ground wire on a kind of high pressure overhead power line
CN110635211A (en) * 2019-09-05 2019-12-31 夏士桀 Communication iron tower with deicing and hail prevention functions

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