CN108009318A - The emulation modelling method of ground resistance - Google Patents

The emulation modelling method of ground resistance Download PDF

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Publication number
CN108009318A
CN108009318A CN201711105331.1A CN201711105331A CN108009318A CN 108009318 A CN108009318 A CN 108009318A CN 201711105331 A CN201711105331 A CN 201711105331A CN 108009318 A CN108009318 A CN 108009318A
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shaft tower
ground
lightning
ground resistance
current
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CN108009318B (en
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赵海龙
王思捷
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Electric Power Research Institute of Hainan Power Grid Co Ltd
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Electric Power Research Institute of Hainan Power Grid Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation

Abstract

The invention discloses a kind of emulation modelling method of ground resistance, choose the ground resistance that G0 is shaft tower where lightning strike spot, GR1, GR2, GR3, GR4, GR5, GR6, GR7 are followed successively by using the ground resistance of shaft towers of the G0 as starting point from left to right, GL1, GL2, GL3, GL4, GL5, GL6, GL7 are followed successively by using the ground resistance of shaft towers of the G0 as starting point from right to left;Then the emulation and modeling of ground resistance are carried out, by the change of ground resistance on entering influence caused by the ground quantity of electric charge, to find ground resistance exception in time.

Description

The emulation modelling method of ground resistance
Technical field
The present invention relates to the emulation modelling method of modeling method, more particularly to ground resistance.
Background technology
Lightning fault is that most frequent failure occurs for transmission line of electricity, if can efficiently reduce lightning fault, very great Cheng The Grounding of shaft tower is depended on degree.If there is ground connection exception when thunder and lightning hits shaft tower, can cause between conducting wire and ground wire Pressure difference it is excessive so that occur strike back tripping fault.The exception of overhead line structures ground resistance is found in advance, can help electric power work Damage to crops caused by thunder prevention work is carried out as personnel, therefore can be grounded resistance on-line monitoring there is an urgent need for research at present and directly reflect punching The method for hitting ground resistance.This method, since thunder and lightning sheet is as impact signal, is studied at this time using nature thunderbolt as signal source Impulse earthed resistance characteristic is presented in ground resistance.Herein using electric charge size as fundamental surveillance amount, ground connection electricity is determined by emulating The increase and decrease situation for entering the ground quantity of electric charge in abnormal conditions is hindered, it is follow-up so as to be carried out using this method to the abnormal conditions of ground resistance Monitoring, improve monitoring efficiency.
The content of the invention
With this, the problem to be solved in the present invention is to provide a kind of change by the use of thunderbolt electric current as measurement of Grounding Resistance mirror Change influences on entering ground electric charge, to find a kind of emulation modelling method of ground resistance of ground resistance exception in time.
A kind of emulation modelling method of ground resistance, comprises the following steps:
S1:After thunder and lightning hits lightning conducter, lightning current is propagated from lightning strike spot to both sides, therefore chooses G0 bars where lightning strike spot The ground resistance of tower, using ground resistance that G0 is the shaft tower of starting point from left to right as GR1, GR2 ... GRn (n be more than 0 from So number), using the ground resistance that G0 is the shaft tower of starting point from right to left as GL1, GL2 ... GLn (n is the natural number more than 0);
S2:It is that double indexes bear lightning wave to choose lightning current;
S3:It is q to take the quantity of electric charge, and the electric current on lightning conducter is I, time t, then
A thunder and lightning electric charge part is flowed into the earth by ground resistance, and another part is then stayed in power transmission line, big by flowing into The ground quantity of electric charge and the ratio of overall charge amount are denoted as diverting coefficient k, and in the case of regarding power transmission line as endless, each shaft tower is attached Near equivalent circuit is identical, and k can regard fixed value as, and Ig is the shunting of current shaft tower, and the ground resistance of current shaft tower is G1, after The ground resistance parallel connection for continuing each shaft tower collectively constitutes G2, and diverting coefficient is determined by the equiva lent impedance of G1, G2 and circuit and shaft tower, Regarding the electric current on the ground resistance Gn by current shaft tower as Ign, then Ign=kI (1-k) ^n, n is the natural number more than 0, The electric current for flowing into every shaft tower can be calculated by the relation between above-mentioned coefficient;
S4:Lightning conducter is emulated using LCC modules, enters ground lightning wave on shaft tower using wave impedance element simulation Wave process, extracts the stray currents data in simulation process, and calculates the thunder and lightning quantity of electric charge with numerical integration algorithm (1);
S5:Choose the shaft tower that G0 shaft towers are hit by thunder and lightning, analysis lightning current and G0 shaft towers monosymmetric GRn and GLn The relation of the sum of shaft tower electric current (including G0), is painted out lightning current, GR (n-1) or GL (n-1) (and both of which by simulation software Including G0 shaft towers), the oscillogram of the sum of the monosymmetric GRn of G0 shaft towers and GLn shaft tower electric currents (including G0 shaft towers), so that it is determined that The earth current of GR (n-1) or GL (n-1) (and both of which includes G0 shaft towers) and registration and G0 with incident lightning current waveform The sum of the monosymmetric GRn of shaft tower and GLn shaft tower electric currents (including G0) earth current and the registration with incident lightning current waveform, And compare the size in oscillogram between both registrations, so that it is determined that calculating the shaft tower number needed for the electric charge for flowing into the earth Amount;
S6:Be fitted into ground the quantity of electric charge equation be y=0.24890.8765x- 0.05971 (2), so that it is determined that entering ground The exponential fitting curve of the quantity of electric charge, x is shaft tower radix in formula, and G0 should be 0, GR1 for x and should be 1, GR2 for x should be for x 2, and so on, therefore can be learnt according to equation and exponentially decayed with the increase of shaft tower radix into the ground quantity of electric charge, i.e. electric current Often decay by a base shaft tower all in accordance with fixed proportion, decay size is related with diverting coefficient k;
S7:Any one ground resistance resistance value in this model is changed, and draws any one ground resistance resistance value and changes After change it is obtained enter ground quantity of electric charge curve, when on any one shaft tower ground resistance change when, then enter ground on the shaft tower The ground electric charge that enters when electric charge does not change with the pole tower ground resistance resistance value compares and can change, and remaining shaft tower charge propagation Rule is constant, still exponentially attenuation law.
Preferably, it is 20KA that double indexes, which bear thunder and lightning wave amplitude,.
The beneficial effects of the present invention are:
A kind of emulation modelling method of ground resistance provided by the present invention, utilizes the change of thunderbolt current measurement ground resistance Change influences on entering ground electric charge, to find ground resistance exception in time, so as to develop corresponding system according to this method to supervise Survey the abnormal conditions of ground resistance.
Brief description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are only the preferred embodiment of the present invention, for For those of ordinary skill in the art, without creative efforts, other can also be obtained according to these attached drawings Attached drawing.
Fig. 1 is that a kind of ground resistance of the emulation modelling method of ground resistance of the present invention calculates model;
Fig. 2 is the lightning wave waveform inputted in a kind of emulation of the emulation modelling method of ground resistance of the present invention;
Fig. 3 is a kind of current distributing schematic diagram of the emulation modelling method of ground resistance of the present invention;
Fig. 4 is a kind of simulation model of the emulation modelling method of ground resistance of the present invention;
Fig. 5 is that a kind of the sum of shaft tower earth current of the emulation modelling method of ground resistance of the present invention is contrasted with lightning current;
Fig. 6 is that a kind of emulation modelling method of ground resistance of the present invention by pole tower ground resistance enters the ground quantity of electric charge;
Fig. 7 be a kind of emulation modelling method of ground resistance of the present invention there are pole tower ground resistance during Abnormal Grounding resistance Enter ground the quantity of electric charge.
Embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and cited embodiment is served only for explaining this hair It is bright, it is not intended to limit the scope of the present invention.
A kind of emulation modelling method of ground resistance, comprises the following steps:
Referring to Fig. 1, after thunder and lightning hits lightning conducter, lightning current is propagated from lightning strike spot to both sides, therefore it is lightning strike spot to choose G0 The ground resistance of place shaft tower, using the ground resistance of shaft towers of the G0 as starting point from left to right be followed successively by GR1, GR2, GR3, GR4, GR5, GR6, GR7, using the ground resistance of shaft towers of the G0 as starting point from right to left be followed successively by GL1, GL2, GL3, GL4, GL5, GL6, GL7;
Referring to Fig. 2, it is that to bear lightning wave and amplitude be 20KA to double indexes to choose lightning current;
Referring to Fig. 3, it is q to take the quantity of electric charge, and the electric current on lightning conducter is I, time t, then
A thunder and lightning electric charge part is flowed into the earth by ground resistance, and another part is then stayed in power transmission line, big by flowing into The ground quantity of electric charge and the ratio of overall charge amount are denoted as diverting coefficient k, and in the case of regarding power transmission line as endless, each shaft tower is attached Near equivalent circuit is identical, and k can regard fixed value as, and Ig is the shunting of current shaft tower, and the ground resistance of current shaft tower is G1, after The ground resistance parallel connection for continuing each shaft tower collectively constitutes G2, and diverting coefficient is determined by the equiva lent impedance of G1, G2 and circuit and shaft tower, In the present embodiment, k=0.83, the electric current for flowing into every shaft tower can be calculated by the relation between above-mentioned coefficient, such as will The electric current that the electric current that electric current on GR1 is regarded as on Ig1, GR2 is regarded as on Ig2, GR3 regards Ig3 as, then Ig1=kI, Ig2=k (1- K) I, Ig2=k (1-k) (1-k) I, according to above-mentioned rule can and so on, therefore can calculate every shaft tower divides electric current;
Referring to Fig. 4, model is built according to the signal of Fig. 1 in ATP-EMTP, lightning conducter is imitated using LCC modules Very, enter wave process of the ground lightning wave on shaft tower using wave impedance element simulation, extract the stray currents data in simulation process, And calculate the thunder and lightning quantity of electric charge with numerical integration algorithm (1);
The shaft tower that G0 shaft towers are hit by thunder and lightning is chosen, analyzes the sum of lightning current and GL7-GR7 pentadecyl shaft tower electric currents Relation, is painted out the sum of lightning current, earth current in seven base shaft towers and the earth current in pentadecyl shaft tower by MATLAB The sum of oscillogram, so that it is determined that the earth current of seven base shaft towers and with the registration of incident lightning current waveform and pentadecyl shaft tower Earth current and the registration with incident lightning current waveform, and compare the size in oscillogram between both registrations, so that Determine to calculate the shaft tower quantity needed for the electric charge for flowing into the earth;In this Fig. 5, waveform is divided into three sections, is respectively 0- 60us sections, 60us-150us sections and more than 150us sections, in 60us-150us sections, pentadecyl shaft tower earth current Essentially coincided with incident lightning current waveform.Not exclusively overlapped in 0-60us, more than 150us section, in 0-60us, there are high frequency Oscillating part, there are low frequency part, these misaligned parts are drawn by the catadioptric of lightning current on the line in more than 150us sections Rise.This two parts electric current can reach farther distance, by the simulation result of above-mentioned Fig. 5, a part of thunder on the line Electric current is flowed into the earth within seven base shaft towers, and another part lightning current then stays in the line, and at least 90% thunder and lightning Stream can be flowed into the earth within seven base shaft towers, therefore in the subsequent step of the present embodiment, only calculate seven base shaft towers enters ground The quantity of electric charge.
Be fitted into ground the quantity of electric charge equation be y=0.24890.8765x- 0.05971 (2), so that it is determined that entering ground electricity The exponential fitting curve of lotus amount, x is shaft tower radix in formula, and G0 should be 0, GR1 for x and should be 1, GR2 for x should be 2 for x, And so on, therefore can be learnt according to equation and exponentially decayed with the increase of shaft tower radix into the ground quantity of electric charge, i.e., electric current is every Decay by a base shaft tower all in accordance with fixed proportion, decay size is related with diverting coefficient k;Analyze referring to Fig. 6 and further thunder The propagation law of electric charge, it is contemplated that symmetry, only calculates the electric charge that G0-GR7 flows into the earth here, enters the ground quantity of electric charge such as Fig. 6 It is negative electrical charge to enter ground electric charge shown in middle circle, in emulation, therefore Fig. 6 only shows the numerical values recited into ground electric charge, enters the ground quantity of electric charge Exponentially decay with the increase of shaft tower radix, (root-mean-square error is the reality of measurement to fitting root-mean-square error here close to zero Border enters root mean square size between ground electric charge and matched curve).This is consistent with the analysis to circuit shown in Fig. 3, i.e., electric current is every Decay by a base shaft tower all in accordance with fixed proportion, decay size is related with diverting coefficient k, and simulation result shows ground resistance just Chang Shi, entering the ground quantity of electric charge, exponentially attenuation law is propagated on lightning conducter.
By in this model any one ground resistance resistance value change, and draw any one ground resistance resistance value change after It is obtained enter ground quantity of electric charge curve, when on any one shaft tower ground resistance change when, then on the shaft tower enter ground electric charge The ground electric charge that enters when not changing with the pole tower ground resistance resistance value compares and can change, and remaining shaft tower charge propagation rule It is constant, still exponentially attenuation law.The resistance value of ground resistance GR2 is modified as 20 ohm by 6 ohm in this model, to repairing Model after changing is calculated and is drawn into the ground quantity of electric charge, is obtained shown in Fig. 7 as a result, according to Fig. 7, ground resistance GR2 During rise, compare and reduce with Fig. 6 by the ground electric charge that enters of ground resistance GR2.As included failure point curve institute in Fig. 7 Show occurred deviateing between actual data point and matched curve.If remaining quantity of electric charge in addition to GR2 is intended into row index Close, then the fitting root-mean-square error and the fitting root-mean-square error after the quantity of electric charge exponential fitting including GR2 are relatively small.This says It is bright to be reduced when GR2 resistance increases by the ground quantity of electric charge that enters of shaft tower GR2 resistance, and the charge propagation rule of remaining shaft tower It is constant, still exponentially attenuation law.
Influenced using the change of thunderbolt current measurement ground resistance on entering ground electric charge, to find that ground resistance is different in time Often, so as to develop corresponding system according to this method so as to the abnormal conditions of monitoring grounding resistance.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention god.

Claims (2)

1. a kind of emulation modelling method of ground resistance, it is characterised in that comprise the following steps:
S1:After thunder and lightning hits lightning conducter, lightning current is propagated from lightning strike spot to both sides, therefore it is shaft tower where lightning strike spot to choose G0 Ground resistance, using ground resistance that G0 is the shaft tower of starting point from left to right as GR1, GR2 ... GRn, (n is the nature more than 0 Number), using the ground resistance that G0 is the shaft tower of starting point from right to left as GL1, GL2 ... GLn (n is the natural number more than 0);
S2:It is that double indexes bear lightning wave to choose lightning current;
S3:It is q to take the quantity of electric charge, and the electric current on lightning conducter is I, time t, then
<mrow> <mi>q</mi> <mo>=</mo> <msubsup> <mo>&amp;Integral;</mo> <mn>0</mn> <mi>t</mi> </msubsup> <mi>I</mi> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mi>d</mi> <mi>t</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
A thunder and lightning electric charge part is flowed into the earth by ground resistance, and another part is then stayed in power transmission line, will flow into the earth electricity Lotus amount and the ratio of overall charge amount are denoted as diverting coefficient k, in the case of regarding power transmission line as endless, near each shaft tower Equivalent circuit is identical, and k can regard fixed value as, and Ig is the shunting of current shaft tower, and the ground resistance of current shaft tower is G1, follow-up each The ground resistance parallel connection of shaft tower collectively constitutes G2, and diverting coefficient is determined by the equiva lent impedance of G1, G2 and circuit and shaft tower, will be logical Electric current on the ground resistance Gn of excessive preceding shaft tower regards Ign, then Ign=kI (1-k) ^n as, and n is the natural number more than 0, is passed through Relation between above-mentioned coefficient can calculate the electric current for flowing into every shaft tower;
S4:Lightning conducter is emulated using LCC modules, enters ripple mistake of the ground lightning wave on shaft tower using wave impedance element simulation Journey, extracts the stray currents data in simulation process, and calculates the thunder and lightning quantity of electric charge with numerical integration algorithm (1);
S5:Choose the shaft tower that G0 shaft towers are hit by thunder and lightning, analysis lightning current and the monosymmetric GRn of G0 shaft towers and GLn shaft towers The relation of the sum of electric current (including G0), by simulation software paint out lightning current, (and both of which includes by GR (n-1) or GL (n-1) G0 shaft towers), the oscillogram of the sum of the monosymmetric GRn of G0 shaft towers and GLn shaft tower electric currents (including G0 shaft towers), so that it is determined that GR (n-1) or the earth current of GL (n-1) (and both of which includes G0 shaft towers) and with the registration of incident lightning current waveform and G0 bars The sum of the monosymmetric GRn of tower and GLn shaft tower electric currents (including G0) earth current and the registration with incident lightning current waveform, and Compare the size between both registrations in oscillogram, so that it is determined that calculating the shaft tower quantity needed for the electric charge for flowing into the earth;
S6:Be fitted into ground the quantity of electric charge equation be y=0.24890.8765x- 0.05971 (2), so that it is determined that entering ground electricity The exponential fitting curve of lotus amount, x is shaft tower radix in formula, and G0 should be 0, GR1 for x and should be 1, GR2 for x should be 2 for x, And so on, therefore can be learnt according to equation and exponentially decayed with the increase of shaft tower radix into the ground quantity of electric charge, i.e., electric current is every Decay by a base shaft tower all in accordance with fixed proportion, decay size is related with diverting coefficient k;
S7:By in this model any one ground resistance resistance value change, and draw any one ground resistance resistance value change after It is obtained enter ground quantity of electric charge curve, when on any one shaft tower ground resistance change when, then on the shaft tower enter ground electric charge The ground electric charge that enters when not changing with the pole tower ground resistance resistance value compares and can change, and remaining shaft tower charge propagation rule It is constant, still exponentially attenuation law.
2. the emulation modelling method of a kind of ground resistance according to claim 1, it is characterised in that double indexes bear thunder Electric wave amplitude is 20KA.
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