CN103296631A - Secondary capacitor compensating current transformer type heating ice-melting device for transmission line wires - Google Patents

Abstract

The invention discloses a secondary capacitor compensating current transformer type heating ice-melting device for transmission line wires. The device is composed of a cylindrical sleeve-shaped tilting fillet capable of being opened and closed, an iron core and a remotely controlled movement mechanism. The iron core is provided with two windings, one winding is connected with an electric stove wire embedded in the tilting fillet, and the other winding supplies power to the movement mechanism. The secondary capacitor compensating current transformer type heating ice-melting device for the transmission line wires has the advantages that line outage is not required, live working is achieved, a system device running state is not changed, no influence is caused to a system running mode, and potential safety hazards of a power grid and direct and indirect economic loss which are caused by power outage are avoided.

Description

The hot deicing device of current transformer formula transmission line wire of second capacitor compensation

Technical field

The present invention relates to transmission line wire deicing field, specifically is the hot deicing device of current transformer formula transmission line wire of second capacitor compensation.

Background technology

At present, the removing ice of power transmission line method mainly contains two kinds both at home and abroad: (1) thermal ice-melting method; (2) mechanical deicing's method.

(1) thermal ice-melting method

This method mainly contains excess current de-icing method, short circuit current method, direct current ice-melting method, electric current of intermediate frequency ice-melting method.

The excess current de-icing method changes electric network swim and distributes by the scheduling of science, and line current is reached more than the icing critical current.Increase circuit transmission load current advantage and be need not interruption of power supply raising electric network reliability, simple and easy to do, but weak point is to carry out ice-melt to lightning conducter, changes electric network swim in addition and distributes, and differing makes line current reach more than the icing critical current surely.

The main thought of short circuit current method short circuit scheme is with circuit three-phase short circuit (earth-free) somewhere, applies certain voltage at this circuit then, utilizes short circuit current to produce heat and carries out ice-melt.Shortcoming mainly is, the choosing and providing of ice-melt power supply, and circuit needs out of service.

The direct current ice-melting method applies DC power supply with line end short circuit head end, and by direct current, lead or lightning conducter heating melt the ice in circuit or the lightning conducter.Shortcoming is the continuous-current plant costliness, and circuit needs out of service.For DC power transmission line, can directly utilize the rectifying installation in the rotary substation; For the transmission line of alternation current, must be equipped with other DC power supply, or utilize the static passive compensation device SVC in the transformer station.

The electric current of intermediate frequency ice-melting method applies intermediate frequency power supply with line end short circuit head end, and by electric current of intermediate frequency, because under the intermediate frequency situation, ice cube produces dielectric loss, heating melts the ice thereupon in circuit or lightning conducter and the icing thereof.Shortcoming is intermediate frequency power supply device costliness, and circuit needs out of service.

A common shortcoming of above-mentioned several method is: owing to be difficult to provide power supply in the middle of the circuit, the ice-melt scope can only begin to certain intermediate point of circuit in the slave station, or even completely, can't be separately serious to icing regional ice-melt, partly the not serious circuit of icing or icing does not pass through big electric current yet, increased electric energy loss like this, and the also corresponding raising of the capacity of deicing device.Generally speaking, the serious icing of circuit just is present in the part shaft tower scope, and it is very unrealistic to require all to be equipped with expensive deicing device in the transformer station that is connected with the icing circuit.

(2) mechanical deicing's method

Mechanical deicing's method mainly contains artificial deicing method, pulley one-lick and powerful vibration method.The pulley shovel technology of scraping is the method that a kind of pulley that can be walked on the line by terrestrial operation personnel pulling is rooted out icing on the lead, and this method is the mechanical means of at present unique feasible removing ice of power transmission line.By external vibrator make the deicing technology of freezing transmission line wire and backguy vibration since require to add vibration source and vibration to accelerate cable tired thereby be difficult to adopt in actual engineering.

In addition, also have some new methods, as infrared deicing, laser deicing, impulse method etc., but all be in conceptual phase, also be difficult to promote the use of.

Summary of the invention

The device that the object of the present invention is to provide a kind of current transformer formula directly to obtain electric energy and carry out capacitor compensation, wire icing of transmission line carried out the heat thawing at secondary circuit from circuit, it can be enclosed within on the lead of icing by the lifting of insulation rope, and the icing on the lead is melted.

The technical scheme that the present invention solves the problems of the technologies described above is as follows:

The hot deicing device of current transformer formula transmission line wire of second capacitor compensation, this device is made up of watt seat 5, iron core 3 and remote-controlled travel mechanism.

1. each modular construction:

Described remote-controlled travel mechanism is made of the control cabinet of belt wheel; But described watt of seat is the cylinder-shaped sleeve of folding, inlays electric furnace heating wire in the sleeve pipe; But described iron core is the cylinder-shaped sleeve of folding, and two windings are arranged in the sleeve pipe, and winding and capacitor series connection back link to each other with electric furnace heating wire in being embedded in watt seat, and another winding links to each other with the power line of mobile control cabinet;

2. each parts annexation: watt cover for seat is in iron core, and remote-controlled travel mechanism is connected outside the iron core by the wheel of the control cabinet of belt wheel;

3. the operation of the hot deicing device of current transformer formula transmission line wire of second capacitor compensation:

Pass through the lifting of insulation rope during the device operation, but but the iron core of folding of device and watt seat of folding are opened, be enclosed within on the lead of icing layer, again on the closure, because lead is connected with very big electric current, according to the law of electromagnetic induction, will produce induced potential and induced current on the winding of corresponding iron core, make the electric furnace heating wire heating of watt seat, and pass to the ice cube that covers conductive line surfaces by watt seat, ice cube is melted; By the control cabinet of remote control travel mechanism, the wheel that makes device advances or retreats at lead, the icing of a span inside conductor can be melted.

The above-mentioned hot deicing device foundation of current transformer formula transmission line wire based on second capacitor compensation:

(1) utilizes the law of electromagnetic induction directly to obtain electric energy from circuit, electric energy is converted into heat wire icing is carried out heat melts, and provide power supply for driving mechanism.

(2) number of turn of device is 1, and the secondary circuit number of turn is big, so the secondary circuit emotional resistance is big, compensates at secondary circuit serial connection capacitor, to reduce the loop total impedance, improves output current and power.

Outstanding advantage of the present invention is:

(1) hot line job does not need circuit out of service.

(2) device can only carry out ice-melt to the serious part span of icing, and does not need the whole piece circuit is carried out ice-melt.

(3) gait of march that can control device is controlled the amplitude of ice-melt, and is will all icing melting layers intact, and only need be melted to safe amplitude.

(4) low cost, run unit can dispose many according to actual needs.

Description of drawings

Fig. 1 is the structure chart of the hot deicing device of current transformer formula transmission line wire of the present invention.

Among the figure, lead 1, icing layer 2, iron core 3, winding 4, watt seat 5, wheel 6, control cabinet 7.

Fig. 2 is iron core, watt seat, ice coating wire and winding schematic diagram.

Among the figure, lead 1, icing layer 2, iron core 3, winding 4, watt seat 5.

Fig. 3 is iron circuit computation model figure.

Fig. 4 is the secondary circuit equivalent circuit diagram.

Embodiment

Below by drawings and Examples technical scheme of the present invention is further specified.

The hot deicing device structure of current transformer formula transmission line wire of second capacitor compensation as depicted in figs. 1 and 2, the hot deicing device of current transformer formula transmission line wire of second capacitor compensation, this device is made up of watt seat 5, iron core 3 and remote-controlled travel mechanism.

1. each modular construction:

Described remote-controlled travel mechanism is made of the control cabinet 7 of belt wheel 6.But described watt of seat 5 is cylinder-shaped sleeves of folding, inlays electric furnace heating wire in the sleeve pipe.But described iron core 3 is cylinder-shaped sleeves of folding, has 4, one windings of two windings and capacitor series connection back to link to each other with electric furnace heating wire in being embedded in watt seat in the sleeve pipe, and another winding links to each other with the power line of mobile control cabinet 7.

2. each parts annexation: watt seat 5 wraps in the iron core 3, and remote-controlled travel mechanism is connected outside the iron core 3 by the wheel 6 of the control cabinet 7 of belt wheel 6.

3. the operation of the hot deicing device of current transformer formula transmission line wire of second capacitor compensation:

Pass through the lifting of insulation rope during the device operation, but but the iron core 3 of the folding of device and watt seat 5 of folding are opened, be enclosed within on the lead 1 of icing layer 2, again on the closure, because lead 1 is connected with very big electric current, according to the law of electromagnetic induction, will produce induced potential and induced current on the winding 4 of corresponding iron core 3, make the electric furnace heating wire heating of watt seat 5, and pass to the ice cube that covers conductive line surfaces by watt seat, ice cube is melted; By the control cabinet 7 of remote control travel mechanism, the wheel 6 that makes device advances or retreats at lead, the icing of a span inside conductor can be melted.

Operation principle:

The power line conductive line current is Secondary loop current The iron core inside radius is r ₁, outer radius r ₂, length is D, and as shown in Figure 3, the secondary number of turn is n, and air gap is δ, and the iron core magnetic permeability is μ=μ _rμ ₀, μ ₀Be air permeability.

Secondary circuit can equivalence be circuit as shown in Figure 4, and L is the secondary circuit self-induction, and M is primary circuit and secondary circuit mutual inductance, R ₀Be coil resistance, R _LBe load resistance, R=R ₀+ R _LIn order to reduce the secondary circuit impedance, improve secondary loop current, in secondary circuit, be connected in series electric capacity, loop induction reactance is compensated.

The secondary circuit self-induction is:

$L=\frac{\mathrm{\&mu;}{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA00003480532200011.png"\; state="\{\{state\}\}">n</figure-callout>}}^2\mathrm{<figure-callout\; id="2"\; label="Dk"\; filenames="HDA00003480532200011.png"\; state="\{\{state\}\}">Dk</figure-callout>}}{2\mathrm{\&pi;}}$

Primary circuit and secondary circuit mutual inductance are:

$M=\frac{\mathrm{<figure-callout\; id="2"\; label="unDk"\; filenames="HDA00003480532200011.png"\; state="\{\{state\}\}">unDk</figure-callout>}}{2\mathrm{\&pi;}}$

In the formula $k=\ln \left(\frac{2\mathrm{\&pi;}{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HDA00003480532200011.png"\; state="\{\{state\}\}">r</figure-callout>}}_2+\mathrm{\&delta;}{\mathrm{\&mu;}}_r-\mathrm{\&delta;}}{2\mathrm{\&pi;}{\mathrm{<figure-callout\; id="1"\; label="r"\; filenames="HDA00003480532200011.png"\; state="\{\{state\}\}">r</figure-callout>}}_1+\mathrm{\&delta;}{\mathrm{\&mu;}}_r-\mathrm{\&delta;}}\right).$

The secondary current effective value is:

$I_{2m}=\frac{\mathrm{\&omega;<figure-callout\; id="2"\; label="M\; R"\; filenames="HDA00003480532200011.png"\; state="\{\{state\}\}">M</figure-callout>}}{\sqrt{R^{}}}{I}_{1m}$

Power output is:

$P=R_L\frac{{\left(\mathrm{\&omega;M}\right)}^2}{R^z+Z^z}{I}_{1\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="HDA00003480532200011.png"\; state="\{\{state\}\}">m</figure-callout>}}^2$

In the formula $Z=\mathrm{\&omega;L}-\frac{1}{\mathrm{\&omega;c}}.$

Embodiment 1

Set transmission line wire primary current effective value I _1m=300A.

Iron core inside radius r ₁=0.1m, outer radius r ₂=0.12m, length D=0.4m, secondary coil number of turn n=200, air gap delta=0.0005m, iron core relative permeability μ _r=3000, load resistance R _L=48.4 Ω.Select the enamelled wire of copper core nominal diameter 2.02mm, copper core area 3.205mm ², km resistance 5.47 Ω, coil internal resistance R ₀=0.0175 Ω.

Secondary circuit self-induction L=0.5508H, primary circuit and secondary circuit mutual inductance M=0.00275H, building-out capacitor is got C=17 μ F, secondary current effective value I _2m=5.289A, power output P=1354W.

Power output is enough to the icing on the lead is melted.

Embodiment 2

Set transmission line wire primary current effective value I _1m=400A.

Iron core inside radius r ₁=0.1m, outer radius r ₂=0.12m, length D=0.3m, secondary coil number of turn n=220, air gap delta=0.0005m, iron core relative permeability μ _r=3000, load resistance R _L=48.4 Ω.Select the enamelled wire of copper core nominal diameter 2.02mm, copper core area 3.205mm ², km resistance 5.47 Ω, coil internal resistance R ₀=0.0144 Ω.

Secondary circuit self-induction L=0.4998H, primary circuit and secondary circuit mutual inductance M=0.00227H, building-out capacitor is got C=21.3 μ F, secondary current effective value I _2m=5.818A, power output P=1638W.

Power output is enough to the icing on the lead is melted.

Embodiment 3

Set transmission line wire primary current effective value I _1m=500A.

Iron core inside radius r ₁=0.1m, outer radius r ₂=0.12m, length D=0.2m, secondary coil number of turn n=250, air gap delta=0.0005m, iron core relative permeability μ _r=3000, load resistance R _L=48.4 Ω.Select the enamelled wire of copper core nominal diameter 2.02mm, copper core area 3.205mm ², km resistance 5.47 Ω, coil internal resistance R ₀=0.0109 Ω.

Secondary circuit self-induction L=0.4303H, primary circuit and secondary circuit mutual inductance M=0.00172H, building-out capacitor is got C=25 μ F, secondary current effective value I _2m=5.31A, power output P=1469W.

Power output is enough to the icing on the lead is melted.

Claims (2)

1. the hot deicing device of current transformer formula transmission line wire of second capacitor compensation is characterized in that this device is made up of a watt seat, iron core and remote-controlled travel mechanism:

1) each modular construction:

Described remote-controlled travel mechanism is made of the control cabinet of belt wheel; But described watt of seat is the cylinder-shaped sleeve of folding, inlays electric furnace heating wire in the sleeve pipe; But described iron core is the cylinder-shaped sleeve of folding, and two windings are arranged in the sleeve pipe, and winding and capacitor series connection back link to each other with electric furnace heating wire in being embedded in watt seat, and another winding links to each other with the power line of mobile control cabinet;

2) each parts annexation: watt cover for seat is in iron core, and remote-controlled travel mechanism is connected outside the iron core by the wheel of the control cabinet of belt wheel;

3) operation of the hot deicing device of current transformer formula transmission line wire of second capacitor compensation:

Pass through the lifting of insulation rope during the device operation, but but the iron core of folding of device and watt seat of folding are opened, be enclosed within on the lead of icing layer, again on the closure, because lead is connected with very big electric current, according to the law of electromagnetic induction, will produce induced potential and induced current on the winding of corresponding iron core, make the electric furnace heating wire heating of watt seat, and pass to the ice cube that covers conductive line surfaces by watt seat, ice cube is melted; By the control cabinet of remote control travel mechanism, the wheel that makes device advances or retreats at lead, the icing of a span inside conductor can be melted.

2. the hot deicing device of current transformer formula transmission line wire based on second capacitor compensation according to claim 1, it is characterized in that: (1) utilizes the law of electromagnetic induction directly to obtain electric energy from circuit, electric energy is converted into heat wire icing is carried out heat melts, and provide power supply for driving mechanism; (2) number of turn of device is 1, and the secondary circuit number of turn is big, so the secondary circuit emotional resistance is big, compensates at secondary circuit serial connection capacitor, to reduce the loop total impedance, improves output current and power.

Images