CN103296631B - The hot deicing device of current transformer type transmission line wire that second capacitor compensates - Google Patents

Abstract

The invention discloses the hot deicing device of current transformer type transmission line wire that second capacitor compensates.This device, by can watt seat of cylindrical shroud tubulose of folding, iron core and a remote-controlled travel mechanism form, iron core has two windings, and a winding is connected with the electric furnace heating wire being embedded in watt seat, and another winding provides power supply for travel mechanism.The present invention has the prominent advantages that: assembly of the invention does not need line outage, for livewire work, do not change system equipment running status, system operation mode is not impacted, it is to avoid the potential safety hazard caused to electrical network that has a power failure and directly or indirectly economic loss.

Description

The hot deicing device of current transformer type transmission line wire that second capacitor compensates

Technical field

The present invention relates to transmission line wire deicing field, the hot deicing device of current transformer type transmission line wire that specifically second capacitor compensates.

Background technology

At present, domestic and international removing ice of power transmission line method mainly has two kinds: (1) thermal ice-melting method；(2) mechanical deicing's method.

(1) thermal ice-melting method

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

The scheduling by science of the excess current de-icing method, changes electric network swim distribution, makes line current reach more than icing critical current.Increase line transmission load current advantage and improve electric network reliability without interruption of power supply, simple and easy to do, but weak point is lightning conducter to be carried out ice-melt, changes electric network swim distribution in addition, it is not necessary to line current can be made to reach more than icing critical current.

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

Line end short circuit head end is applied DC source by DC current ice-melting method, circuit or in lightning conducter by DC current, wire or lightning conducter heating melt the ice.Shortcoming is that continuous-current plant is expensive, and circuit needs out of service.For DC power transmission line, it is possible to directly utilize the rectifying installation in rotary substation；For transmission line of alternation current, it is necessary to be equipped with other DC source, or utilize the static passive compensation device SVC in transformer station.

Line end short circuit head end is applied by electric current of intermediate frequency in intermediate frequency power supply, circuit or lightning conducter and icing thereof by electric current of intermediate frequency ice-melting method, and owing to, in intermediate frequency situation, ice cube produces dielectric loss, heating melts the ice therewith.Shortcoming is that intermediate frequency power supply device is expensive, and circuit needs out of service.

One common shortcoming of above-mentioned several method is: owing to being difficult to provide power supply in the middle of circuit, ice-melt scope can only start to certain intermediate point of circuit in slave station, or even completely, region ice-melt that cannot be individually serious to icing, the part circuit that icing or icing are not serious is also by big electric current, which increase electric energy loss, and the capacity of deicing device also improves accordingly.Generally, a serious icing of circuit is simply present within the scope of part shaft tower, it is desirable to the deicing device being all equipped with costliness in the transformer station being connected to icing circuit is very unrealistic.

(2) mechanical deicing's method

Mechanical deicing's method mainly has artificial deicing method, pulley one-lick and powerful vibratory drilling method.The pulley shovel technology of scraping is a kind of to be pulled the pulley that can walk on the line to root out the method for icing on wire by ground handling operator, and this method is the mechanical means of currently the only feasible removing ice of power transmission line.Made the clearing ice technology freezing transmission line wire and bracing wire vibration owing to requiring applied vibration source and vibrating acceleration cable fatigue thus be difficult in Practical Project employing by external vibrator.

Additionally, also have some new methods, such as infrared deicing, laser deicing, impulse method etc., but all in conceptual phase, also it is difficult to promote the use of.

Summary of the invention

It is an object of the invention to provide a kind of current transformer type from circuit, directly obtain electric energy and carry out capacitor compensation at secondary circuit, wire icing of transmission line carries out the device of heat thawing, it can pass through insulating cord lifting and be enclosed within the wire of icing, is melted by the icing on wire.

The technical scheme is that

The hot deicing device of current transformer type transmission line wire that second capacitor compensates, 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 up of the control chamber of provided with wheels；Described watt of seat be can the first cylinder-shaped sleeve of folding, inlay electric furnace heating wire in sleeve pipe；Described iron core be can the second cylinder-shaped sleeve of folding, have two windings in sleeve pipe, be connected with the electric furnace heating wire being embedded in watt seat after a winding is connected with capacitor, another winding is connected with the power line of movement control chamber；

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

3. the operation of the hot deicing device of current transformer type transmission line wire that second capacitor compensates:

Lifted by insulating cord during plant running, by device can the iron core of folding and can opening watt seat of folding, it is enclosed within the wire of icing layer, again in Guan Bi, owing to wire is connected with very big electric current, according to the law of electromagnetic induction, the winding of corresponding iron core will produce induced potential and faradic current, the electric furnace heating wire making watt seat generates heat, and is passed to the ice cube covering conductive line surfaces by watt seat, makes ice melting；By the control chamber of remote-controlled movement mechanism, make the wheel of device advance on wire or retreat, the icing of a span inside conductor can be melted.

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

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

(2) number of turn of device is 1, and the secondary circuit number of turn is big, and therefore secondary circuit emotional resistance is big, compensates at secondary circuit serial capacitance device, to reduce loop total impedance, carries High Output Current and power.

The present invention has the prominent advantages that:

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

(2) the part span that icing is serious only can be carried out ice-melt by device, carries out ice-melt without to whole piece circuit.

(3) gait of march of device can be controlled to control the amplitude of ice-melt, it is not necessary to by complete for all icing melting layers, and only need to be melted to safe amplitude.

(4) low cost, run unit can configure multiple stage according to actual needs.

Accompanying drawing explanation

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

In figure, wire 1, icing layer 2, iron core 3, winding 4, watt seat 5, wheel 6, control chamber 7.

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

In figure, wire 1, icing layer 2, iron core 3, winding 4, watt seat 5.

Fig. 3 is iron circuit computation model figure.

Fig. 4 is secondary circuit equivalent circuit diagram.

Detailed description of the invention

Below by way of drawings and Examples, the technical solution of the utility model is further illustrated.

The hot deicing device structure of current transformer type transmission line wire that second capacitor compensates is as depicted in figs. 1 and 2, the hot deicing device of current transformer type transmission line wire that second capacitor compensates, 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 up of the control chamber 7 of provided with wheels 6.Described watt of seat 5 be can the first cylinder-shaped sleeve of folding, inlay electric furnace heating wire in sleeve pipe.Described iron core 3 be can the second cylinder-shaped sleeve of folding, have two windings 4 in sleeve pipe, be connected with the electric furnace heating wire being embedded in watt seat after a winding is connected with capacitor, another winding is connected with the power line of movement control chamber 7.

2. each parts annexation: watt seat 5 wraps in iron core 3, remote-controlled travel mechanism is connected to outside iron core 3 by the wheel 6 of the control chamber 7 of provided with wheels 6.

3. the operation of the hot deicing device of current transformer type transmission line wire that second capacitor compensates:

Lifted by insulating cord during plant running, by device can the iron core 3 of folding and can opening watt seat 5 of folding, it is enclosed within the wire 1 of icing layer 2, again in Guan Bi, owing to wire 1 is connected with very big electric current, according to the law of electromagnetic induction, the winding 4 of corresponding iron core 3 will produce induced potential and faradic current, the electric furnace heating wire making watt seat 5 generates heat, and is passed to the ice cube covering conductive line surfaces by watt seat, makes ice melting；By the control chamber 7 of remote-controlled movement mechanism, make the wheel 6 of device advance on wire or retreat, the icing of a span inside conductor can be melted.

Operation principle:

Power line conductive line current isSecondary loop currentIron core inside radius is r₁, outer radius r₂, length is D, as it is shown on figure 3, the secondary number of turn is n, air gap is δ, and iron core magnetic conductance is μ=μ_rμ₀, μ₀For air permeability.

Secondary circuit can be equivalent to circuit as shown in Figure 4, and L is secondary circuit self-induction, and M is primary circuit and secondary circuit mutual inductance, R₀For coil resistance, R_LFor load resistance, R=R₀+R_L.In order to reduce secondary circuit impedance, improve secondary loop current, serial capacitance in secondary circuit, loop induction reactance is compensated.

Secondary circuit self-induction is:

$L=\frac{{\mathrm{\μn}}^{2}Dk}{2\mathrm{\π}}$

Primary circuit and secondary circuit mutual inductance be:

$M=\frac{\mathrm{\μ}nDk}{2\mathrm{\π}}$

In formula $k=\ln \left(\frac{2{\mathrm{\πr}}_2+{\mathrm{\δ\μ}}_T-\mathrm{\δ}}{2{\mathrm{\πr}}_1+{\mathrm{\δ\μ}}_T-\mathrm{\δ}}\right).$

Secondary current virtual value is:

$I_{2m}=\frac{\mathrm{\ω}M}{\sqrt{R^2+Z^2}}{I}_{1m}$

Output is:

$P=R_L\frac{{\left(\mathrm{\ω}M\right)}^2}{R^2+Z^2}{I}_{1m}^2$

In formula $2=\mathrm{\ω}L-\frac{1}{\mathrm{\ω}C}.$

Embodiment 1

Set transmission line wire primary current virtual value I_1m=300A.

Iron core inside radius r₁=0.1m, outer radius r₂=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 enamel-covered wire of copper core nominal diameter 2.02mm, copper core area 3.205mm², km resistance 5.47 Ω, Coil resistance R₀=0.0175 Ω.

Secondary circuit self-induction L=0.5508H, primary circuit and secondary circuit mutual inductance M=0.00275H, compensate electric capacity and take C=17 μ F, secondary current virtual value I_2m=5.289A, output P=1354W.

Output is enough to melt the icing on wire.

Embodiment 2

Set transmission line wire primary current virtual value I_1m=400A.

Iron core inside radius r₁=0.1m, outer radius r₂=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 enamel-covered wire of copper core nominal diameter 2.02mm, copper core area 3.205mm², km resistance 5.47 Ω, Coil resistance R₀=0.0144 Ω.

Secondary circuit self-induction L=0.4998H, primary circuit and secondary circuit mutual inductance M=0.00227H, compensate electric capacity and take C=21.3 μ F, secondary current virtual value I_2m=5.818A, output P=1638W.

Output is enough to melt the icing on wire.

Embodiment 3

Set transmission line wire primary current virtual value I_1m=500A.

Iron core inside radius r₁=0.1m, outer radius r₂=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 enamel-covered wire of copper core nominal diameter 2.02mm, copper core area 3.205mm², km resistance 5.47 Ω, Coil resistance R₀=0.0109 Ω.

Secondary circuit self-induction L=0.4303H, primary circuit and secondary circuit mutual inductance M=0.00172H, compensate electric capacity and take C=25 μ F, secondary current virtual value I_2m=5.31A, output P=1469W.

Output is enough to melt the icing on wire.

Claims (2)

1. the hot deicing device of current transformer type transmission line wire that second capacitor compensates, it is characterised in that this device is made up of a watt seat (5), iron core (3) and remote-controlled travel mechanism:

1) each modular construction:

Described remote-controlled travel mechanism is made up of the control chamber (7) of provided with wheels (6)；Described watt of seat (5) be can the first cylinder-shaped sleeve of folding, inlay electric furnace heating wire in sleeve pipe；Described iron core (3) is can the second cylinder-shaped sleeve of folding, two windings (4) are had in sleeve pipe, one winding is connected with the electric furnace heating wire being embedded in a watt seat (5) after connecting with capacitor, and another winding is connected with the power line of mobile control chamber (7)；

2) each parts annexation: watt seat (5) is enclosed within iron core (3), remote-controlled travel mechanism is connected to iron core (3) outward by the wheel (6) of the control chamber (7) of provided with wheels (6)；

3) operation of the hot deicing device of current transformer type transmission line wire that second capacitor compensates:

Lifted by insulating cord during plant running, by device can the iron core (3) of folding and can opening watt seat (5) of folding, it is enclosed within the wire (1) of icing layer (2), again in Guan Bi, owing to wire (1) is connected with very big electric current, according to the law of electromagnetic induction, the winding (4) of corresponding iron core (3) will produce induced potential and faradic current, the electric furnace heating wire making a watt seat (5) generates heat, and pass to, by watt seat (5), the ice cube covering wire (1) surface, make ice melting；By the control chamber (7) of remote-controlled movement mechanism, make the wheel (6) of device in the upper advance of wire (1) or retreat, the icing of a span inside conductor (1) can be melted.

2. the hot deicing device of current transformer type transmission line wire that second capacitor according to claim 1 compensates, it is characterized in that: (1) utilizes the law of electromagnetic induction directly to obtain electric energy from circuit, convert electrical energy into heat and wire (1) icing is carried out heat thawing, and provide power supply for driving mechanism；(2) number of turn of device is 1, and the secondary circuit number of turn is big, and therefore secondary circuit emotional resistance is big, compensates at secondary circuit serial capacitance device, to reduce loop total impedance, carries High Output Current and power.