CN101860086A - Overhead line energy acquisition method and device for supply energy to on-line electric power monitoring equipment - Google Patents

Abstract

The invention discloses an overhead line energy acquisition method for supply energy to on-line electric power monitoring equipment. In the method, a metal coil is arranged at an appropriate position around a current-carrying overhead transmission line and at least one turn is wound on the metal coil; a beginning end and a tail end are formed on the metal coil due to winding; the current of the transmission line generates a magnetic filed around; the magnetic field passes through the metal coil and generates a potential difference between the leading-out beginning end and the tail end through induction; and the beginning end and the tail end are connected to an energy supply processing device and the induced electric energy is converted into a power supply voltage magnitude which is suitable for the on-line monitoring device of the line so as to realize low-voltage power supply of the on-line monitoring device. In the method, the rectangular metal coil is arranged below the overhead transmission line and the potential difference is generated through electromagnetic induction so as to realize the low-voltage power supply of the on-line monitoring device of the line. The method has the advantages of simple arrangement, low implementation cost, high safety performance due to low potential and suitability for popularization. The invention also discloses an overhead line energy acquisition energy supply device.

Description

The overhead wire energy-collecting method and the device that are used for the energy supply of electric power online monitoring equipment

Technical field

The present invention relates to electric power online monitoring field, particularly a kind of overhead wire energy-collecting method that is used for the energy supply of electric power system on-line monitoring equipment also relates to a kind of overhead wire electricity energy harvester that is used for the energy supply of electric power online monitoring equipment simultaneously.

Background technology

Along with development and national economy, the electric pressure of electric power system and scale develop rapidly thereupon and enlarge, the electric power system overhead transmission line has a very wide distribution, be subjected to the influence of natural phenomenas such as thunder and lightning, filth, dense fog, sleet, strong wind easily, transmission line accident such as cause thunder and lightning, pollution flashover, icing, wave.

Some overhead transmission line is owing to be located in high and steep mountains, lake, Plain, be difficult to it is carried out effectively artificial line walking, investigation accident, therefore, the transmission line state on_line monitoring becomes one of requisite measure, by on-line monitoring, can realize not in related personnel's presence, obtaining the various state parameters of transmission line automatically, so that take corresponding measure, thereby reach the purpose of avoiding accident to take place.This shows that the transmission line state on_line monitoring plays important effect for the stable operation of electric power system.

At present, on-the-spot on-Line Monitor Device is installed on overhead transmission line line pole tower or the lead, can't conveniently obtain the low-tension supply energy, and because transmission line and shaft tower are located in remotely, can't be separately its power supply.The major part that its power supply is supplied with is to get energy by solar panels.In sunshine not enough area or season, the energy shortage that obtains by solar panels very easily causes the power failure of monitoring equipment to keep online monitoring equipment continuous service, causes equipment operation to stop.

Other has supply power mode such as powered battery, wind energy power supply and capacitance partial pressure to get energy etc., realizes easily though powered battery is simple, is subjected to the limitation of battery capacity, needs the frequent battery of changing; Wind energy power supply is to be the on-line monitoring power devices with a small-sized wind power generator, because the generator supply equipment use of could generating electricity when needing wind-force greater than certain grade, thereby the reliability of supply of electrical energy can not be guaranteed; Capacitance partial pressure is got and can then is subjected to such environmental effects bigger, and power is less, is difficult to realize reliable power supply.

Summary of the invention

In view of this, one of purpose of the present invention provides a kind of overhead wire energy-collecting method that is used for the energy supply of electric power online monitoring equipment, by the rectangular metal coil is set below overhead transmission line, produce electrical potential difference by electromagnetic induction, the rectangular metal coil is connected to the power supply processing unit and induction electric energy converted to the power supply magnitude that is fit to the circuit on-Line Monitor Device, realize the low-voltage power supply of on-Line Monitor Device, this method is implemented easily, realize with low cost, can reach good power supply effect, not influenced by natural cause; Simultaneously, two of purpose of the present invention provide a kind of overhead wire electricity energy harvester based on this method.

One of purpose of the present invention is achieved through the following technical solutions: the suitable position around overhead transmission line is provided with a wire coil, described wire coil coiling at least is 1 circle, on the wire coil because coiling forms top and tail end, the electric current of transmission line produces magnetic field around, wire coil is passed in this magnetic field, between top of drawing and tail end, form electrical potential difference by induction, top and tail end are connected to the energy supply processing unit and convert induction electric energy to be fit to the circuit on-Line Monitor Device power supply magnitude, realize the low-voltage power supply of on-Line Monitor Device.

Further, described wire coil is the rectangle frame structure;

Further, described suitable position be meant the placement location of rectangular metal coil should guarantee its apart from the nearest frame of overhead transmission line and overhead transmission line any one mutually the distance of transmission line all greater than safe distance;

Further, the plane of described rectangular metal coil composition is vertical mutually with the plane at the common place of three phase line of overhead transmission line.

Two of purpose of the present invention is achieved through the following technical solutions: this overhead wire electricity energy harvester that is used for the energy supply of electric power online monitoring equipment comprises wire coil and energy supply processing unit, described rectangular metal coil coiling at least is 1 circle, because coiling forms top and tail end, described top and tail end are connected to the input of energy supply processing unit on the wire coil;

Described energy supply processing unit comprises rectification unit, filter unit and the voltage regulation unit that connects according to this, and the power output end of described voltage regulation unit is used to connect the power input of outside line on-Line Monitor Device.

Further, described wire coil is the rectangle frame structure.

The invention has the beneficial effects as follows:

The present invention forms electrical potential difference by wire coil is set by induction below overhead transmission line, realize the low-voltage power supply of circuit on-Line Monitor Device, complete equipment is simple, maintenance cost and cheap for manufacturing cost, owing to be in electronegative potential, its security performance height is fit to promote the use of.

Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being conspicuous to those skilled in the art, perhaps can obtain instruction from the practice of the present invention to investigating hereinafter.Target of the present invention and other advantages can realize and obtain by following specification and claims.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:

Fig. 1 is a method principle schematic of the present invention;

Fig. 2 is the additional schematic diagram of Fig. 1;

Fig. 3 is the oscillogram that ε changes with t.

Embodiment

Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.

The overhead wire energy-collecting method that is used for the energy supply of electric power online monitoring equipment of the present invention is that the suitable position around overhead transmission line is provided with wire coil, this wire coil can adopt multiple shape, for ease of implementing and making, adopt the rectangle frame structure in the present embodiment, suitable position be meant the placement location of rectangular metal coil should guarantee its apart from the nearest frame of overhead transmission line and overhead transmission line any one mutually the distance of transmission line all greater than safe distance.

Wire coil coiling at least is 1 circle, on the wire coil because coiling forms top and tail end, the electric current of transmission line produces magnetic field around, wire coil is passed in this magnetic field, between top of drawing and tail end, form electrical potential difference by induction, top and tail end are connected to the energy supply processing unit and convert induction electric energy to be fit to the circuit on-Line Monitor Device power supply magnitude, realize the low-voltage power supply of on-Line Monitor Device.

As depicted in figs. 1 and 2, in the present embodiment, below transmission line, place one high be a, grow and be the rectangular metal coil of b, the transmission line electric current is I, and the plane that the rectangular metal coil is formed is vertical mutually with the plane at the common place of three phase line of overhead transmission line.

Transmission line produces magnetic field around, and wire coil is passed in magnetic field, thereby forms electrical potential difference by induction between the two ends of drawing.

For in the frame more arbitrarily (x, y)

According to Amp, have

(wherein B is a magnetic flux density, μ ₀Be air permeability, I is a power line current)

Order

(I wherein _mBe amplitude, w is an angular frequency, Be phase angle)

Can get:

Have $B=\frac{{\mathrm{\&mu;}}_0\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="HSA00000103946400021.png"\; state="\{\{state\}\}">I</figure-callout>}}{2\mathrm{\&pi;y}}$

(Φ is the magnetic flux that passes frame)

If frame is a h rice from conductor spacing, the high a rice of frame, long b rice then has

$\mathrm{\&Phi;}={\&Integral;}_{-h}^{-a-h}\frac{{\mathrm{\&mu;}}_0\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="HSA00000103946400021.png"\; state="\{\{state\}\}">I</figure-callout>}}{2\mathrm{\&pi;y}}\mathrm{dy}\&CenterDot;{\&Integral;}_x^{b+x}\mathrm{dx}=\frac{{\mathrm{\&mu;}}_0\mathrm{<figure-callout\; id="2"\; label="I"\; filenames="HSA00000103946400021.png"\; state="\{\{state\}\}">I</figure-callout>}}{2\mathrm{\&pi;}}\&CenterDot;b\&CenterDot;(\ln (a+h)-\ln h)$

When number of turn N=1, magnetic linkage equals magnetic flux, then has: Ψ=Φ

Then when I changed, the induced potential that is produced was:

$\mathrm{\&epsiv;}=-\frac{\mathrm{d\&Phi;}}{\mathrm{dt}}=-\frac{{\mathrm{\&mu;}}_0\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="HSA00000103946400021.png"\; state="\{\{state\}\}">b</figure-callout>}}{2\mathrm{\&pi;}}\&CenterDot;(\ln (a+h)-\ln h)\&CenterDot;\frac{\mathrm{dI}}{\mathrm{dt}}$

Again

W=2 π f (f is a frequency)

So

Consider the influence of other two-phase, as shown in Figure 2,

Make between the transmission line two-phase distance be d, have

So have

ε＝ε1+ε2+ε3

Work as h=1.5m, a=5m, b=10m, I=1000A, d=2,

The number of turn is 10 o'clock, draws ε by matlab software and changes coordinate diagram with t, and as shown in Figure 3, as seen under other two-phase influence, the induced voltage peak value has certain decline, and the peak value of ε 1 is 9.2V, and the peak value of ε is 8V.D is big more simultaneously, and the influence of two relative ε is more little in addition, and spaced apart d is relevant with line architecture, and general line voltage distribution grade is high more, and d is big more.

According to electric energy acquisition method of the present invention, overhead transmission line energy acquisition power supply device of the present invention comprises rectangular metal coil and power supply processing unit, comprise wire coil and energy supply processing unit, in the present embodiment, wire coil adopts the rectangular metal coil, the wire coil coiling is 1 circle, because coiling forms top and tail end, described top and tail end are connected to the input of energy supply processing unit on the wire coil; The energy supply processing unit comprises rectification unit, filter unit and the voltage regulation unit that connects according to this, wherein, the interchange that rectification unit is used for obtaining converts direct current to, filter unit is used for direct current is carried out filtering, and voltage regulation unit is used for the dc voltage stability of filter unit output a suitable constant current magnitude and export the power input of outside line on-Line Monitor Device to.

The analysis showed that according to above-mentioned, device of the present invention can long-term work in the industrial frequency AC environment, with the complete electrical isolation of electrical network; Have simple in structure, be convenient to advantages such as installation; But owing to the rising of transmission line safe distance with voltage increases, and h must be greater than safe distance, be that h increases, 1. know when other parameter constants by calculating formula, the voltage ratio low-voltage grade that the voltage levels line influence gets is little, the transmission line electric current reduces with the increase of line voltage distribution again, and induced electromotive force is directly proportional with the transmission line electric current, and promptly the high more induced electromotive force of line voltage distribution is more little.

Application example

(1) 380V electric power networks:

Line security distance is 1 meter, and the top of wire coil is apart from the distance h=1m of circuit, and coil dimension is 5 * 10m, i.e. a=5m, and b=10m, transmission line electric current are 1000A, and the number of turn is 10, and the induced voltage that obtains is:

(2) 10kV electric power networks:

Line security distance is 1.5 meters, and the top of wire coil is apart from the distance h=1.5m of circuit, and coil dimension is 5 * 10m, i.e. a=5m, and b=10m, transmission line electric current are 1000A, and the number of turn is 10, and the induced voltage that obtains is:

(3) 110kV electric power networks:

Line security distance is 4 meters, wire coil the top apart from the distance h=4m of circuit, coil dimension is 5 * 10m, i.e. a=5m, b=10m, transmission line electric current are 1000A, the number of turn is 10, the induced voltage that obtains is:

From last analysis as can be known the present invention more be applicable to low voltage grade electrical network comparatively speaking.Regulate the voltage request that can satisfy power consumption equipment by the number of turn simultaneously.

Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of the technical program, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (6)

1. the overhead wire energy-collecting method that is used for the energy supply of electric power system on-line monitoring equipment, it is characterized in that: the suitable position around the current-carrying overhead transmission line is provided with a wire coil, described wire coil coiling at least is 1 circle, on the wire coil because coiling forms top and tail end, the electric current of transmission line produces magnetic field around, wire coil is passed in this magnetic field, between top of drawing and tail end, form electrical potential difference by electromagnetic induction, top and tail end are connected to the energy supply processing unit and convert induction electric energy to be fit to the circuit on-Line Monitor Device power supply magnitude, realize the low-voltage power supply of on-Line Monitor Device.

2. the overhead wire energy-collecting method that is used for the energy supply of electric power online monitoring equipment according to claim 1 is characterized in that: described wire coil is the rectangle frame structure.

3. the overhead wire energy-collecting method that is used for the energy supply of electric power online monitoring equipment according to claim 2 is characterized in that: described suitable position be meant the placement location of rectangular metal coil should guarantee its apart from the nearest frame of overhead transmission line and overhead transmission line any one mutually the distance of transmission line all greater than safe distance.

4. the overhead wire energy-collecting method that is used for the energy supply of electric power online monitoring equipment according to claim 3 is characterized in that: the plane that described rectangular metal coil is formed is vertical mutually with the plane at the common place of three phase line of overhead transmission line.

5. the overhead wire electricity energy harvester that is used for the energy supply of electric power online monitoring equipment, be used to be arranged on the low-voltage power supply of the below realization of overhead transmission line to the circuit on-Line Monitor Device, it is characterized in that: comprise wire coil and energy supply processing unit, described rectangular metal coil coiling at least is 1 circle, because coiling forms top and tail end, described top and tail end are connected to the input of energy supply processing unit on the wire coil;

Described energy supply processing unit comprises rectification unit, filter unit and the voltage regulation unit that connects according to this, and the power output end of described voltage regulation unit is used to connect the power input of outside line on-Line Monitor Device.

6. the overhead wire electricity energy harvester that is used for the energy supply of electric power online monitoring equipment shown in claim 5, it is characterized in that: described wire coil is the rectangle frame structure.

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