CN104062516B - Method for simulating influence of high-voltage AC power transmission line on buried steel pipeline - Google Patents

Abstract

The invention provides a method for simulating influence of a high-voltage AC power transmission line on a buried steel pipeline. Three magnetic leakage strengthening cables are arranged according to a high-voltage AC power transmission line three-phase transmission mode via an insulating bracket to simulate three-phase AC of the high-voltage power transmission line, and the three magnetic leakage strengthening cables are distributed above the outdoor buried pipeline to simulate the high-voltage power transmission line. Bracket support of the insulating bracket is controlled by a stepping motor. A cross angle of the three-phase magnetic leakage strengthening cable and the buried pipeline is adjusted, and the size of the cross angle is accurately controlled by the stepping motor. Overhead height of the magnetic leakage strengthening cable is adjusted by the bracket. Alternating current is adopted to act as an interference excitation source, and magnetic field intensity generated by the three-phase magnetic leakage strengthening cable is adjusted via adjusting the size of alternating current flowing through the cable. Simulation of interference of the high-voltage AC power transmission line with different voltage levels on the buried pipeline can be realized so that accurate control of change of the three-phase transmission arrangement mode of the three magnetic leakage strengthening cables and the cross angle between the buried pipeline and the cables can be realized.

Description

The analogy method that a kind of HVAC power transmission line affects on buried steel pipeline

Technical field

The present invention is the analogy method that a kind of HVAC power transmission line affects on buried steel pipeline.It is related to tubing Technical field.

Background technology

In recent years, with the High Speed Construction of high-voltage AC transmission net and oil and gas pipes, ultra-high-tension power transmission line and buried oil gas The intersection of pipeline, parallel phenomenon get more and more, and the energy " public corridor " is more and more universal.But the electromagnetic field of ultra-high-tension power transmission line Environment, unusual service condition run and ground connection setting etc. all can be neighbouring to it buried steel pipeline cause stray electrical current disturb, one The cathodic protection system that the stray electrical current interference that a little regions cause has resulted in buried pipeline cannot normally run, or even causes to manage Road corrosion failure and electric shock pipe operations personnel, seriously threaten it adjacent to the safety of buried pipeline and normal operation.Due to existing The direct method of testing that field adopts can only measure formation electromagnetism under measurement moment operating condition above pipeline for the transmission line of electricity , the induced potential being formed and electric current on pipeline are difficult to measure in real time.

There are two kinds on the research method of this impact at present：One kind is to be calculated by method for numerical simulation, and another kind is The first buried steel pipeline measurement pipeline ac potential near HVAC power transmission line, then in use for laboratory in-site measurement Pipe ground ac potential be applied on lab simulation pipeline as ac voltage and evaluate its impact to pipeline.Former approach Need to obtain the detailed construction of HVAC power transmission line（Including ground connection）, operating condition parameter, Soil structure along the line, and bury The corrosion electrochemistry data of ground pipeline, above-mentioned data acquisition difficulty is very big, and numerical simulation result and situ measurements Identical situation by above parameter affected larger so that between the two generally deviation larger, lead to be difficult to accurate evaluation pipeline meet with The interference damage being subject to.Later approach exists not enough as follows：One be in-site measurement value be frequently not steady state value, by anthropic factor shadow Ring big；Two is to be difficult to determine the principal element causing the interference of pipeline stray electrical current（It is electromagnetic field or earthed system, or its He）；Three be with regard to electromagnetic field on buried pipeline impact carry out lab simulation research difficulty very big.CN102435877A discloses one kind The interference that high-voltage alternating aerial power transmission line affects on buried metal oil and gas pipes determines method, but it can not produce to alternating current Electromagnetic interference carry out accurate adjustment.Therefore, existing research method is difficult to effectively analyze and evaluates HVAC power transmission line Impact to buried steel pipeline.

Content of the invention

The purpose of the present invention is that a kind of HVAC power transmission line realizing different electric pressures of invention is done to buried pipeline The simulation disturbed, the angle of the crossing realizing between three leakage fields enhancing cable three-phase transmission arrangement mode changes and buried pipeline and cable The analogy method that the HVAC power transmission line accurately controlling of degree affects on buried steel pipeline.

Its cardinal principle is to strengthen the electric current magnetic induction coupling of cable using leakage field（Electromagnetic field inducing）Carry out simulated high-pressure defeated Electric line transmits the impact to buried steel pipeline for the power-frequency voltage, strengthens magnetic field intensity and the space bit of cable by changing leakage field Put the impact of simulated high-pressure transmission line of electricity buried pipeline near different operating modes, line construction and position are to it.

The technical solution adopted in the present invention is：Three leakage fields are strengthened by cable by insulating support and presses high-voltage AC transmission Circuit three-phase transmission mode arranges the three-phase alternating current of simulated high-pressure transmission line of electricity, and is laid in above outdoor buried pipeline Carry out simulated high-pressure transmission line of electricity, the bracket support of insulating support by step motor control, achievable three-phase leakage field strengthen cable with Buried pipeline intersects or parallel at any angle.The size of its intersecting angle strengthens cable by motor precise control, leakage field Overhead height by bracket adjustment.Using alternating current as interference driving source, big by adjusting the alternating current flowing through cable Little come to adjust three-phase leakage field strengthen cable produced by magnetic field intensity.

The constituting as shown in figure 1, embedded tubing 1 is buried by typical buried depth of equipment therefor of the present invention, and Apply cathodic protection system；Ground above embedded tubing 1 arranges ac-excited power supply 4, from soft by computer The ac-excited power supply 4 that part controls（In Fig. 14）Three ac-excited power supply I outfan a, ac-excited power supply II output Port b, ac-excited power supply III output port c respectively with connecting wire I 5, connecting wire II 6, connecting wire III 7 one end Be connected, connecting wire I 5, connecting wire II 6, connecting wire III 7 the other end respectively be set up in leakage field and strengthen cable and insulation The leakage field cable 15 of simulation A phase in mounting system 3, the leakage field cable 16 of simulation B phase, the one of the leakage field cable 17 of simulation C phase End is connected, and the leakage field cable 15 of simulation A phase, the leakage field cable 16 of simulation B phase, the other end of the leakage field cable 17 of simulation C phase divide It is not connected with one end of the connecting wire IV 8 in Fig. 1, connecting wire V 9, connecting wire VI 10, connecting wire IV 8, connection are led Line V 9, the other end three return interface ac-excited power supply return terminals with ac-excited power supply 4 respectively of connecting wire VI 10 Mouth Id, ac-excited power supply return port IIe, ac-excited power supply returns port IIAnd if is connected.

Described leakage field strengthens cable and insulating support system 3 includes insulating support 11, adjusts supporting construction I 12, adjusts and prop up Support structure II 13 and regulation supporting construction III 14；The leakage field cable 15 of simulation A phase is placed in frame mesh, and this frame mesh is by adjusting Section supporting construction I 12 is supported with insulating support 11 and is connected；The leakage field cable 16 of simulation B phase is placed in frame mesh, this frame net Lattice are connected by adjusting supporting construction II 13 and supported with insulating support 11；The leakage field cable 17 of simulation C phase is placed in frame mesh, should Frame mesh is connected by adjusting supporting construction III 14 and supported with insulating support 11；

Described ac-excited power supply 4 is from the ac-excited power supply by computer software control.

The method of the present invention is：The first step, according to distributed transmission line model, if buried pipeline is parallel with transmission line of electricity Or close to parallel（Process if intersecting and can making equivalent parallel by parallel task scheduling situation, equivalent length is relevant with intersecting angle α, its It is worth for 20arctan α), then apply Caron-Clem formula：

$E=-\mathrm{jf}\frac{{\mathrm{\μ}}_{0}I}{2}[\ln \frac{d_{2p}{d}_{3p}}{{d^2}_{1p}}+j\sqrt{3}\ln \frac{d_{2p}}{d_{3p}}]---\left(1\right)$

（In formula, E is pipeline unit length induced voltage, unit：Volt；d_ipFor the distance between the i-th phase line and pipeline, list Position：Rice；F is frequency, takes 50Hz；m₀For air permeability）, and will intend evaluating voltage, electric current of HVAC power transmission line etc. Parameter brings the Analytic Method program worked out by MATLAB into, calculates maximum inductive voltage value on pipeline and its position.

Second step, with the triple line laying structure of HVAC power transmission line and with the relative position of pipeline as foundation, lead to Cross and adjusted supporting construction I 12, adjust supporting construction II 13 and adjusted supporting construction III 14 by the regulation supporting construction of motor, By the leakage field cable 15 of the simulation A phase of analog AC transmission line of electricity three-phase AC line, the leakage field cable 16 of simulation B phase, simulation C The leakage field cable 17 of phase adjust to intend simulated high-pressure transmission line of electricity phase line structure consistent, and movement insulating support 11 make it and bury The relative position of ground tubing 1 is consistent with field condition.Subsequently, the maximum sense that the pipeline first step being calculated produces Answer voltage as given value, and the magnetic field-enhanced multiple Z that three leakage fields are strengthened cable brings into and does equivalent process, according to electricity of inducting Kinetic potential formula（In formula, E is electric field intensity；L is the arithmetic path of path integral；Dl is small line element Plain vector B is magnetic field intensity；T is the time；Ds is small surface element vector）

Or the deformation process formula of Caron-Clem formula

$I=-j\frac{2E}{\mathrm{Zf}[\ln \frac{d_{2p}{d}_{3p}}{{d^2}_{1p}}+j\sqrt{3}\ln \frac{d_{2p}}{d_{3p}}]}---\left(2\right)$

Calculate the required alternating current numerical value flowing through leakage field enhancing cable：Sense further according to actual measurement gained pipeline Answer voltage, by the induced voltage required for finely tuning ac-excited power supply 4 and reaching it is achieved that the high-voltage alternating of different electric pressure The simulation that transmission line of electricity disturbs to buried pipeline.

The beneficial effect that the present invention is reached：Strengthen cable by laying three leakage fields above outdoor buried steel pipe Come simulated high-pressure transmission line of alternation current, three leakage fields are adjusted by the bracket support that motor adjusts insulating support and strengthens cable Relative position and three leakage fields strengthen the relative position of cables and buried pipeline（Parallel, intersect and intersecting angle）, realize Three leakage fields strengthen intersecting angle between the change of cable three-phase transmission arrangement modes and buried pipeline and cable accurately Control it is achieved that the simulation that buried pipeline is disturbed of the HVAC power transmission line of different electric pressure.

Brief description

Fig. 1 is the analogy method schematic diagram that HVAC power transmission line affects adjacent to buried steel pipeline on it

Fig. 2 strengthens the schematic diagram of cable and mounting system for magnetic

Specific embodiment

Embodiment. below in conjunction with the accompanying drawings invention is further described.

The composition of this example equipment therefor as depicted in figs. 1 and 2, buried for 1 meter by typical buried depth by embedded tubing 1 If, and apply cathodic protection system；Ground above embedded tubing 1 arranges ac-excited power supply 4, from by calculating Machine software control three ac-excited power supply I outfan a of ac-excited power supply 4, ac-excited power supply II output port b, Ac-excited power supply III output port c is connected with one end of connecting wire I 5, connecting wire II 6, connecting wire III 7 respectively, even Connect wire I 5, connecting wire II 6, connecting wire III 7 the other end respectively be set up in leakage field and strengthen cable and insulating support system The leakage field cable 15 of simulation A phase on system 3, the leakage field cable 16 of simulation B phase, one end of the leakage field cable 17 of simulation C phase are connected, Simulation A phase leakage field cable 15, simulation B phase leakage field cable 16, simulation C phase leakage field cable 17 the other end respectively with Fig. 1 In connecting wire IV 8, connecting wire V 9, one end of connecting wire VI 10 be connected, connecting wire IV 8, connecting wire V 9, even The other end connecing wire VI 10 returns port Id, friendship with three return ac-excited power supplys of interface of ac-excited power supply 4 respectively Stream excitation power supply returns port IIe, ac-excited power supply returns port IIAnd if is connected.

Described leakage field strengthens cable and insulating support system 3 includes insulating support 11, adjusts supporting construction I 12, adjusts and prop up Support structure II 13 and regulation supporting construction III 14；The leakage field cable 15 of simulation A phase is placed in frame mesh, and this frame mesh is by adjusting Section supporting construction I 12 is supported with insulating support 11 and is connected；The leakage field cable 16 of simulation B phase is placed in frame mesh, this frame net Lattice are connected by adjusting supporting construction II 13 and supported with insulating support 11；The leakage field cable 17 of simulation C phase is placed in frame mesh, should Frame mesh is connected by adjusting supporting construction III 14 and supported with insulating support 11；

Described ac-excited power supply 4 is from the ac-excited power supply GD-ACS03 by computer software control.

In case study on implementation, first by the double loop three-phase symmetrical 110kV high voltage transmission line using LGJ-240/30 cable Away from the parameters such as the associated AC electric current 400A of power transmission line are input to formula behind parallel with buried pipeline 300 meters of road（1）In, The Analytic Method program worked out by MATLAB calculates the highest induction voltage leaving pipe ends in high-voltage line and is 1.5V；So Afterwards, by motor, three magnetic are strengthened the triple line laying of laying cable mode and the 110kV transmission line of alternation current at scene Structure is consistent, and this 50 times of leakage fields strengthen cables and 5 meters of φ 200mm buried pipeline distance, and after parallel with pipeline 150 meters away from Pipeline, the highest induction voltage 1.5V of the pipeline then calculating back brings induced electromotive force formula into（2）, compiled by MATLAB The Analytic Method program of system calculates required electric current 17.35A.Existing in conjunction with buried pipeline two ends detached with cable parallel-segment The inductive voltage value 1.37V of field measurement, by finely tuning ac-excited power supply（In Fig. 14）In cable output AC electric current it is 18.1A reaches required maximum induced voltage 1.5V.

This example is through test it is achieved that three leakage fields strengthen the change of cable three-phase transmission arrangement mode and buried pipeline and cable Between the accurately controlling it is achieved that the HVAC power transmission line of different electric pressure disturbs to buried pipeline of intersecting angle Simulation.Achieve the simulation that the HVAC power transmission line of different electric pressures disturbs to buried pipeline.

Claims (4)

1. the analogy method that a kind of HVAC power transmission line affects on buried steel pipeline, it is characterized in that will by insulating support Three leakage fields strengthen cable and intersect by HVAC power transmission line three-phase transmission mode arranges simulated high-pressure transmission line of electricity three Stream electricity, and be laid in and carry out simulated high-pressure transmission line of electricity above the buried pipeline of outdoor, the bracket support of insulating support is by stepping electricity Machine controls, and adjusts three-phase leakage field and strengthens cable and buried pipeline intersecting angle；The size of its intersecting angle is accurate by motor Control, leakage field strengthens the overhead height of cable by bracket adjustment；Using alternating current as interference driving source, flowed through by adjusting The alternating current size of cable come to adjust three-phase leakage field strengthen cable produced by magnetic field intensity；

The three-phase alternating current of described simulated high-pressure transmission line of electricity is：Embedded tubing (1) is buried by typical buried depth, And apply cathodic protection system；Ground above embedded tubing (1) arranges ac-excited power supply (4), from by counting Three ac-excited power supply I outfan a, ac-excited power supply II outfans of the ac-excited power supply (4) that calculation machine software controls Mouthful b, ac-excited power supply III output port c respectively with connecting wire I (5), connecting wire II (6), connecting wire III (7) One end be connected, connecting wire I (5), connecting wire II (6), connecting wire III (7) the other end respectively be set up in leakage field strengthen The leakage field cable (15) of simulation A phase on cable and insulating support system (3), the leakage field cable (16) of simulation B phase, simulation C phase Leakage field cable (17) one end be connected, simulation A phase leakage field cable (15), simulation B phase leakage field cable (16), simulation C phase Leakage field cable (17) the other end respectively with connecting wire IV (8), connecting wire V (9), connecting wire VI (10) one end It is connected, connecting wire IV (8), connecting wire V (9), the other end of connecting wire VI (10) and the three of ac-excited power supply (4) The individual return ac-excited power supply of interface returns port Id, ac-excited power supply returns port IIe, ac-excited power supply returns to port IIIf.

2. the analogy method that a kind of HVAC power transmission line according to claim 1 affects on buried steel pipeline, its Feature is that described leakage field strengthens cable and insulating support system (3) includes insulating support (11), adjusts supporting construction I (12), adjusts Section supporting construction II (13) and regulation supporting construction III (14)；The leakage field cable (15) of simulation A phase is placed in frame mesh, this frame Frame grid is connected with insulating support (11) support by adjusting supporting construction I (12)；The leakage field cable (16) of simulation B phase is placed in framework On grid, this frame mesh is connected with insulating support (11) support by adjusting supporting construction II (13)；The leakage field cable of simulation C phase (17) it is placed in frame mesh, this frame mesh is connected with insulating support (11) support by adjusting supporting construction III (14).

3. the analogy method that a kind of HVAC power transmission line according to claim 1 affects on buried steel pipeline, its Feature is described ac-excited power supply (4) from the ac-excited power supply by computer software control.

4. the analogy method that a kind of HVAC power transmission line according to claim 1 affects on buried steel pipeline, its Feature is that specific method is：The first step, according to distributed transmission line model, if buried pipeline is parallel with transmission line of electricity or connects Closely parallel, process if intersecting and can making equivalent parallel by parallel task scheduling situation, equivalent length is relevant with intersecting angle α, and its value is 20arctan α, then applies Caron-Clem formula：

$E=-jf\frac{{\mathrm{\μ}}_{0}I}{2}\[\ln \frac{d_{2p}{d}_{3p}}{{d^2}_{1p}}+j\sqrt{3}\ln \frac{d_{2p}}{d_{3p}}\]---\left(1\right)$

In formula, E is pipeline unit length induced voltage, unit：Volt；d_ipFor the distance between the i-th phase line and pipeline, unit： Rice；F is frequency, takes 50Hz；μ₀For air permeability, and will intend evaluating voltage, the current parameters band of HVAC power transmission line Enter the Analytic Method program worked out by MATLAB, calculate maximum inductive voltage value on pipeline and its position；

Second step, with the triple line laying structure of HVAC power transmission line and with the relative position of pipeline as foundation, by by The regulation supporting construction I (12) of motor, regulation supporting construction II (13) and regulation supporting construction III (14), by analog AC The leakage field cable (15) of simulation A phase of transmission line of electricity three-phase AC line, the leakage field cable (16) of simulation B phase, the leakage of simulation C phase Magnetoelectricity cable (17) adjust to intend simulated high-pressure transmission line of electricity phase line structure consistent, and movement insulating support (11) make its with buried The relative position of tubing (1) is consistent with field condition；Subsequently, the maximum sense that the pipeline first step being calculated produces Answer voltage as given value, and the magnetic field-enhanced multiple Z that three leakage fields are strengthened cable brings into and does equivalent process, according to electricity of inducting Kinetic potential formula

In formula, E is electric field intensity；L is the arithmetic path of path integral；Dl is small line element vector B is magnetic field intensity；When t is Between；Ds is small surface element vector；

Or the deformation process formula of Caron-Clem formula

$I=-j\frac{2E}{Zf\[\ln \frac{d_{2p}{d}_{3p}}{{d^2}_{1p}}+j\sqrt{3}\ln \frac{d_{2p}}{d_{3p}}\]}---\left(2\right)$

Calculate the required alternating current numerical value flowing through leakage field enhancing cable：Faradism further according to actual measurement gained pipeline Pressure, reaches required induced voltage it is achieved that the high-voltage alternating of different electric pressure is defeated by finely tuning ac-excited power supply (4) The simulation that electric line is disturbed to buried pipeline.