CN111983358A - Complicated topography scattered current impedance matching performance evaluation system based on electric energy distortion - Google Patents

Abstract

A system for evaluating the impedance matching performance of complex terrain dispersion based on electrical energy distortion, characterized in that the evaluation system includes a tower under test, a grounding device under the tower under test, a mountain under the tower, a side tower, a wireless communication module, a central data processor, and a benchmark. Wave shock generator, solar battery pack, echo collector, reference wave shock output contact, host computer. The evaluation steps of the scattered flow impedance performance of the tower and the grounding device based on the power distortion are as follows: the central data processor controls the reference wave shock generator to send the reference shock voltage waveform to the tower through the reference wave shock output contact, and scan the echo to collect According to the feedback waveform of the device, the central data processor calculates the performance evaluation factor of the scatter resistance based on the feedback waveform. The evaluation factor is evaluated to obtain the scatter resistance performance. The invention can effectively evaluate the flow resistance performance under complex terrain, so as to realize the engineering improvement and safety evaluation of the tower and the grounding device of the electric energy distortion.

Description

An Evaluation System for Impedance Matching Capability of Dispersion in Complex Terrain Based on Electrical Distortion

technical field

The present invention is a complex terrain scattering impedance matching performance evaluation system based on electric energy distortion, which is mainly applied in the field of lightning protection.

Background technique

At present, the development of the power grid is very rapid, and the coordinated operation of the power supply and distribution network has formed a huge power system. Due to the complex terrain and bad weather that the transmission line passes through, the fault caused by lightning tripping accounts for 60% of the total transmission line fault, which has become the main fault type of the transmission line. and the surrounding soil to disperse the lightning current to prevent the lightning current from hitting the transmission line due to excessive voltage at the top of the transmission tower and tower. However, in the complex mountainous terrain, the dispersal path of the transmission line is narrower than that on the flat ground, which leads to a great difference in the dispersal impedance of the transmission line compared with the dispersal impedance in the flat terrain, which makes the original transmission line tower and grounding device. The design of the current dissipation impedance is no longer applicable, and lightning tripping accidents occur frequently. Therefore, in order to ensure the safe operation of transmission lines in complex terrain, it is very important to evaluate the ability of the tower and grounding device to match the scattering impedance of complex terrain.

Since the design of the tower needs to consider the mechanical properties and electrical properties, its impedance is often different from the ideal electrical impedance. The impedance of the grounding device changes due to factors such as corrosion. When the impedance of the tower and the grounding device are not matched enough, the current passes through the tower and the grounding device. When the connection is connected, the energy will be distorted, and the distorted energy will return to the top of the tower to cause a flashover fault. The traditional transmission line bulk impedance measurement equipment is expensive, complicated in steps, and high in manpower requirements. The real-time and accurate evaluation of flow impedance matching performance can collect the power distortion waveform generated when the impedance does not match, and use it to analyze whether the impedance matching performance of the tower and the grounding device is up to standard. The design of towers and grounding devices provides the main engineering reference to realize the safe operation and maintenance of transmission lines.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an evaluation system and evaluation method for the impedance matching performance of complex terrain scattered current based on electric energy distortion.

The technical scheme that realizes the object of the present invention is as follows, comprising the following steps:

Step 1: Establish a performance evaluation platform for bulk flow impedance matching performance based on power distortion in complex terrain. Wireless communication module, central data processor, reference wave shock generator, solar battery pack, echo collector, reference wave shock output contact, host computer;

The tested tower, the grounding device under the tested tower, the mountain under the tower, and the side tower are normally connected;

The wireless communication module communicates with the host computer in the cloud to report the evaluation result;

The central data processor calculates the evaluation factor for the matching performance of the bulk current in combination with the feedback waveform of the echo collector, and reports it to the upper computer;

The reference wave shock generator is externally connected to reference wave shock output contacts, and outputs shock voltage reference waves to the top of the tower under test;

The peripheral solar panel of the solar battery pack supplies power for the device to continue;

Step 2: The host computer sends an evaluation application to the cloud to start the evaluation of the performance of bulk flow impedance matching for complex terrain;

The third step: the central data processor receives the application, and the reference wave shock generator sends the reference shock voltage waveform to the tower through the reference wave shock output contact, and scans the feedback waveform of the echo collector;

Step 4: The central data processor uses the echo collector feedback waveform to calculate the evaluation factor Ω for the matching performance of the loose current impedance:

为山体延长线交角；Ω is the evaluation factor for the matching performance of the scattered flow impedance, r ₁ is the radius of the tower top, r ₂ is the radius of the middle of the tower, r ₃ is the radius of the tower base, h ₁ is the height from the tower base to the midpoint, and h ₂ is the midpoint to the tower. The height of the roof, H is the height of the tower, U _i is the injection voltage of the reference wave shock generator, U _o is the feedback waveform peak value measured by the Hall voltage sensor,

is the intersection angle of the extension line of the mountain;

Step 5: Evaluate the scatter impedance matching performance under the terrain reflected by the scatter impedance matching performance evaluation factor. Ω is in the interval (0, +∞), and the smaller the value, the lower the scatter impedance under the transmission line configuration. The stronger the matching capability, the worse the capability. If Ω is in the interval (0, 1), it means that the scatter impedance matching capability meets the standard. If Ω is in the interval (1, +∞), it means that The scatter impedance matching performance is substandard.

The beneficial effects of the present invention are:

1) It can accurately evaluate the impedance matching performance of scattered flow under complex terrain.

2) The system completes the main operation and control through the host computer, so the operation is intelligent, safe, reliable and universal.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention and the internal structure of the device for evaluating the matching capability of the dissipation impedance.

Detailed ways

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. Contains the following steps:

Step 1: Establish a performance evaluation platform for scattered current impedance matching based on power distortion in complex terrain, the evaluation platform includes a performance evaluation device for scattered current impedance matching (1), a tower under test (2), and a grounding device under the tower under test (3) ), the mountain under the tower (4), the side tower (5), the wireless communication module (6), the central data processor (7), the reference wave shock generator (8), the solar battery pack (9), the echo collector (10), the reference wave impact output contact (11), the host computer (12);

The tested tower (2), the grounding device (3) under the tested tower, the mountain under the tower (4), and the side tower (5) are normally connected;

The wireless communication module (6) communicates with the host computer (12) in the cloud to report the evaluation result;

The central data processor (7) is connected to the reference wave impulse generator (8) to output the operating voltage, and is connected to the echo collector (10) to scan the feedback waveform to calculate the evaluation factor for the matching capability of the scattered current impedance, and report it to the host computer (12) ;

The reference wave shock generator (8) is externally connected to a reference wave shock output contact (11), and outputs shock voltage reference waves to the top of the tower (2) under test;

The reference wave impact output contact (11) and the echo collector (10) are joined together on the top of the measured pole tower (2);

The solar battery group (9) is provided with a peripheral solar battery panel to supply power for the device to continue;

The second step: the assessor operates the host computer (12) to send the assessment application to the cloud, and the wireless communication module (6) receives the application and delivers it to the central data processor (7);

The third step: the central data processor (7) receives the application and starts the evaluation of the performance of the bulk flow impedance matching for complex terrain, and the reference wave shock generator (8) sends the equipment to the tower through the reference wave shock output contact (11). With the preset reference impulse voltage waveform, the echo collector (10) starts to operate, and scans the feedback waveform of the measured tower (2) in real time;

Step 4: The central data processor (7) calculates the evaluation factor Ω for the matching performance of the bulk current in combination with the waveform data fed back by the echo collector (10):

为山体延长线交角；Ω is the evaluation factor for the matching performance of the scattered flow impedance, r ₁ is the radius of the tower top, r ₂ is the radius of the middle of the tower, r ₃ is the radius of the tower base, h ₁ is the height from the tower base to the midpoint, and h ₂ is the midpoint to the tower. The height of the roof, H is the height of the tower, U _i is the injection voltage of the reference wave shock generator, U _o is the feedback waveform peak value measured by the Hall voltage sensor,

is the intersection angle of the extension line of the mountain;

Step 5: Evaluate the scatter impedance matching performance under the terrain reflected by the scatter impedance matching performance evaluation factor. Ω is in the interval (0, +∞), and the smaller the value, the lower the scatter impedance under the transmission line configuration. The stronger the matching capability, the greater the worse the capability. If Ω is within the interval (0, 1), it means that the matching capability of the scattered current impedance meets the standard, and if Ω is within the interval (1, +∞), it means that The scatter impedance matching performance is substandard.

Claims (1)

1. a complex terrain scattering impedance matching performance evaluation system based on electrical energy distortion, is characterized in that, Step 1: Establish a performance evaluation platform for scattered current impedance matching based on power distortion in complex terrain, the evaluation platform includes a performance evaluation device for scattered current impedance matching (1), a tower under test (2), and a grounding device under the tower under test (3) ), the mountain under the tower (4), the side tower (5), the wireless communication module (6), the central data processor (7), the reference wave shock generator (8), the solar battery pack (9), the echo collector (10), the reference wave impact output contact (11), the host computer (12); The tested tower (2), the grounding device (3) under the tested tower, the mountain under the tower (4), and the side tower (5) are normally connected; The wireless communication module (6) communicates with the host computer (12) in the cloud to report the evaluation result; The central data processor (7) calculates the performance evaluation factor of the scattered current impedance matching by combining the feedback waveform of the echo collector (10), and reports it to the upper computer (12); The reference wave shock generator (8) is externally connected to a reference wave shock output contact (11), and outputs shock voltage reference waves to the top of the tower (2) under test; The solar battery group (9) is provided with a peripheral solar battery panel to supply power for the device to continue; The second step: the host computer (12) sends an evaluation application to the cloud, and starts the evaluation of the performance of the bulk flow impedance matching for complex terrain; The third step: the central data processor (7) receives the application, and the reference wave shock generator (8) sends the reference shock voltage waveform to the tower through the reference wave shock output contact (11), and scans the echo collector (10). ) feedback waveform; Step 4: The central data processor (7) combines the echo collector (10) to return the waveform to calculate the scattering impedance matching performance evaluation factor Ω:

Ω is the evaluation factor for the matching performance of the scattered flow impedance, r ₁ is the radius of the tower top, r ₂ is the radius of the middle of the tower, r ₃ is the radius of the tower base, h ₁ is the height from the tower base to the midpoint, and h ₂ is the midpoint to the tower. The height of the roof, H is the height of the tower, U _i is the injection voltage of the reference wave shock generator, U _o is the feedback waveform peak value measured by the Hall voltage sensor,

is the intersection angle of the extension line of the mountain; Step 5: Evaluate the scatter impedance matching performance under the terrain reflected by the scatter impedance matching performance evaluation factor. Ω is in the interval (0, +∞), and the smaller the value, the lower the scatter impedance under the transmission line configuration. The stronger the matching capability, the greater the worse the capability. If Ω is within the interval (0, 1), it means that the matching capability of the scattered current impedance meets the standard, and if Ω is within the interval (1, +∞), it means that The scatter impedance matching performance is substandard.

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