CN103344170A - High voltage transmission conductor sag measuring device and method - Google Patents

Abstract

The invention discloses a high voltage transmission conductor sag measuring device. The measuring device comprises a measuring device shell body which is arranged on a transmission conductor. A radar waveguide opening and a radio frequency antenna are arranged on the surface of the measuring device shell body respectively. A monitoring device main control unit is arranged in the measuring device shell body. The monitoring device main control unit comprises a central processing unit which is connected with a radar sensor unit and a power supply unit respectively through wires. The central processing unit is further connected with a data monitoring terminal and a monitoring center respectively through a communication module. The invention further discloses a measuring method of the measuring device, wherein the radar sensor unit is used for transmitting collected sag information to the central processing unit, and then the central processing unit conducts calculation to obtain a transmission conductor sag value. The high voltage transmission conductor sag measuring device and method can monitor the changes in the sag of a high voltage transmission line in real time and transmit the monitoring data to the backstage monitoring center, thereby guaranteeing the safe operation of an electric power circuit.

Description

High-voltage transmission conductor sag measuring device and method for measuring sag

technical field

The invention belongs to the technical field of power transmission and transformation equipment monitoring, and in particular relates to a high-voltage transmission conductor sag measurement device, and also relates to a method for measuring sag by the high-voltage transmission conductor sag measurement device.

Background technique

The sag of the high-voltage transmission conductor is an important indicator for the safe operation of the line. The size of the sag of the conductor should be controlled within a certain range. And cause disconnection grounding fault, even destroy the pole tower structure erecting the wire or the wind blows the cycloid to cause phase-to-phase short circuit, generate arc and spark to ignite the surrounding combustibles.

In recent years, due to the sharp increase in power load, many transmission lines have increased the maximum allowable temperature of the conductor from 70°C to 80°C in order to improve the transmission capacity. The sag of the transmission line is verified or monitored in real time to ensure the operation of the transmission line and the safety of the equipment being crossed.

At present, people have proposed a variety of methods for the measurement and real-time monitoring of transmission line sag. The traditional transmission line sag measurement methods mainly include: the midpoint height method suitable for relatively flat terrain areas, and the method suitable for mountains and high mountains. Wired angle method and latitude board observation method, but these measurement methods have a large workload, and sometimes are closely related to the safety of the life and property of the measurement staff. In addition, there are methods to measure sag by tension or inclination, to measure sag by wire temperature, and to measure sag by stress, etc., but these methods are inconvenient to operate and have many measurement parameters, resulting in low accuracy of measured sag. Therefore, it is of great significance to conduct in-depth research on accurate real-time monitoring of transmission line sag.

Contents of the invention

The purpose of the present invention is to provide a high-voltage transmission wire sag measurement device, which can monitor the sag change of the high-voltage transmission line in real time for a long time, and can transmit the monitoring data to the background monitoring center, so as to facilitate timely understanding of the sag change of the high-voltage transmission line , to ensure the safe operation of power lines.

Another object of the present invention is to provide a method for measuring sag by the above-mentioned high-voltage transmission conductor sag measuring device.

The technical solution adopted in the present invention is that the high-voltage transmission wire sag measurement device includes a measurement device housing, the measurement device housing is arranged on the power transmission wire, and the surface of the measurement device housing is respectively provided with a radar waveguide port and a radio frequency antenna. The housing of the measuring device includes the main control unit of the monitoring device. The main control unit of the monitoring device includes a central processing unit. The central processing unit is respectively connected to the radar sensor unit and the power supply unit through wires. The data monitoring terminal on the computer and the communication equipment of the monitoring center are connected.

The present invention is also characterized in that,

The housing of the measuring device is set at the place where the sag of the transmission wire is the largest; the housing of the measuring device is made of iron or alloy.

The radar waveguide port provided on the surface of the measuring device housing is horn-shaped, and the radar waveguide port faces the measuring object.

The communication module adopts ZigBee module or RF radio frequency module with ad hoc network function.

The radar sensor unit includes an A/D conversion unit and a microwave radar range-finding sensor connected sequentially through wires.

The power supply unit includes a power control circuit unit, and the power control circuit unit is respectively connected to a charging and discharging storage battery and a wire induction power-taking unit through wires.

The wire induction power-taking unit adopts bayonet type.

Another technical solution adopted in the present invention is that the high-voltage transmission conductor sag measurement device measures the sag measurement method, which is specifically implemented according to the following steps:

Step 1. Set the measuring device housing at the place where the sag of the transmission wire is the largest;

Step 2, using the radar sensor unit to transmit the collected sag information to the central processing unit:

Step 3. Use the transmission conductor sag algorithm module in the central processing unit to perform calculations to obtain the sag value of the transmission conductor.

Another technical solution of the present invention is characterized in that,

Step 2 is specifically implemented according to the following steps:

Step 2.1, using the microwave radar sensor in the radar sensor unit to collect the analog signal of the sag information of the transmission wire, and transmitting the analog signal of the sag information of the transmission wire to the A/D conversion unit;

Step 2.2, after step 2.1, the A/D conversion unit converts the analog signal of the sag information of the transmission wire into a digital signal;

Step 2.3, the A/D conversion unit transmits the digital signal in step 2.2 to the central processing unit.

Step 3 is specifically implemented according to the following steps:

Step 3.1, using the transmission conductor sag algorithm module set in the central processing unit and the transmission conductor sag information obtained in step 2 to calculate the sag value L of the transmission conductor, specifically implement according to the following algorithm:

$\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Cf\; b"\; filenames="HDA00003413854400011.png"\; state="\{\{state\}\}">Cf</figure-callout></span><figure-callout\; id="2"\; label="Cf\; b"\; filenames="HDA00003413854400011.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&Delta;\; f</span>}}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; ;</span>$

In the formula, f _b is the difference frequency, △f is the frequency modulation range, T is the modulation period, and C is the electromagnetic wave propagation speed.

Step 3.2. Send the sag value L of the transmission wire obtained in step 3.1 to the data monitoring terminal on the transmission tower through the communication module through the ZigBee network, and then the data monitoring terminal finally sends it to the communication equipment of the monitoring center.

The beneficial effects of the present invention are:

(1) The sag measurement device of the high-voltage transmission line of the present invention can monitor the sag change of the high-voltage transmission line in real time for a long time, and can transmit the monitoring data to the background monitoring center, so as to facilitate timely understanding of the sag change of the high-voltage transmission line and ensure the power The line runs safely.

(2) In the process of monitoring the sag change of the high-voltage transmission conductor, if the sag measurement device of the high-voltage transmission conductor of the present invention is found to exceed the early warning value, the alarm can be given in time, so as to avoid the damage to the ground and damage caused by the icing of the high-voltage transmission conductor. The distance between trees and buildings is too small to cause grounding, short circuit and other power line accidents.

Description of drawings

Fig. 1 is the structural representation of high-voltage transmission conductor sag measuring device of the present invention;

Fig. 2 is the structural view that the high-voltage transmission conductor sag measuring device of the present invention is arranged on the transmission conductor;

Fig. 3 is a diagram of the frequency relationship between the transmitted signal and the received signal established by using the sag measurement device for high-voltage transmission conductors of the present invention for sag measurement.

In the figure, 1. The main control unit of the monitoring device, 2. The central processing unit, 3. The microwave radar ranging sensor, 4. The power supply control circuit unit, 5. The charging and discharging battery, 6. The wire induction power-taking unit, 7. The communication module , 8. A/D conversion unit, 9. Radar sensor unit, 10. Power supply unit, 11. Power transmission wire, 12. Radio frequency antenna, 13. Radar waveguide port.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The sag measuring device for high-voltage transmission conductors of the present invention has a structure as shown in Figure 1, and includes a measuring device housing, the measuring device housing is arranged on the power transmission conductor 11, and the surface of the measuring device housing is respectively provided with a radar waveguide port 13, The radio frequency antenna 12, the measuring device housing includes a monitoring device main control unit 1, the monitoring device main control unit 1 includes a central processing unit 2, and the central processing unit 2 is respectively connected to a radar sensor unit 9 and a power supply unit 10 through wires, The central processing unit 2 is also connected to the data monitoring terminal on the power transmission tower and the communication equipment of the monitoring center through the communication module 7 .

The housing of the measuring device is arranged at the place where the sag of the transmission wire 11 is the largest.

The housing of the measuring device is made of iron or alloy, which reaches the IP66 protection level. When installed, it is in close contact with the transmission wire and is fixed reliably.

The radar waveguide port 13 provided on the surface of the measuring device housing is horn-shaped, and the radar waveguide port 13 is facing the ground or trees or buildings, that is, facing the measuring object.

Communication module 7 adopts ZigBee module or RF radio frequency module with self-organizing network function, and communication module 7 can send the monitored data to the data monitoring terminal installed on the nearby power transmission tower, also can adopt GPRS, short message or 3G communication The data is directly sent to the communication equipment set in the monitoring center.

The radar sensor unit 9 includes an A/D conversion unit 8 and a microwave radar ranging sensor 3 connected in sequence by wires.

The power supply unit 10 includes a power control circuit unit 4, and the power control circuit unit 4 is respectively connected to a charging and discharging battery 5 and a wire induction power-taking unit 6 through wires.

Wherein, the wire induction power-taking unit 6 adopts a bayonet type and can be fixed on the power transmission wire 11 . The induced current on the transmission wire 11 can be obtained through the induction coil of the wire induction power-taking unit 6, and the induced current is processed by the power control circuit unit 4 to charge the charging and discharging storage battery 5, which must be carried out in strict accordance with the charging and discharging principle of the storage battery; The inductive power-taking unit 6 starts with a low current and can be used normally within the power line current range of 20A to 4000A; it is generally equipped with an 8AH battery, which can monitor the normal operation of the device within 30 days of continuous power outages after a single charge is completed.

The method for measuring sag by the high-voltage transmission conductor sag measuring device of the present invention is specifically implemented according to the following steps:

Step 1. Set the measuring device housing at the place where the sag on the power transmission wire 11 is the largest;

Step 2, utilize the radar sensor unit 9 to transmit the collected sag information to the central processing unit 2:

Step 2.1, using the microwave radar sensor 3 in the radar sensor unit 9 to collect the analog signal of the sag information of the transmission wire, and transmitting the analog signal of the sag information of the transmission wire to the A/D conversion unit 8;

Step 2.2, after step 2.1, the A/D conversion unit 8 converts the analog signal of the sag information of the transmission wire into a digital signal;

Step 2.3, the A/D conversion unit 8 transmits the digital signal in step 2.2 to the central processing unit 2 .

Step 3, use the transmission wire sag algorithm module in the central processing unit 2 to calculate, and obtain the sag value of the transmission wire:

Step 3.1, using the transmission conductor sag algorithm module set in the central processing unit 2 and the transmission conductor sag information obtained in step 2 to calculate the sag value L of the transmission conductor, specifically implement according to the following algorithm:

$\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Cf\; b"\; filenames="HDA00003413854400011.png"\; state="\{\{state\}\}">Cf</figure-callout></span><figure-callout\; id="2"\; label="Cf\; b"\; filenames="HDA00003413854400011.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&Delta;\; f</span>}}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; ;</span>$

In the formula, f _b is the difference frequency, △f is the frequency modulation range, T is the modulation period, and C is the electromagnetic wave propagation speed.

Step 3.2. Send the sag value L of the transmission wire obtained in step 3.1 to the data monitoring terminal on the transmission tower through the communication module 7 via the ZigBee network, and then the data monitoring terminal finally sends it to the communication equipment of the monitoring center. Wherein the communication module 7 is a ZigBee module.

The power supply module 10 in the high-voltage transmission wire sag measurement device of the present invention uses wire mutual induction to take power and a battery to supply power, and the power supply control circuit 4 realizes charging and discharging of the battery; the wire induction power taking unit 6 uses a through-core current transformer. The saturation characteristic of the bus converts the current of a few amps to tens of thousands of amps into a voltage energy of 1-60V, and then after current limiting, rectification, filtering, and DC/DC, it supplies power to the device and charges the battery at the same time.

The principle of data collection by the microwave radar ranging sensor 3 is:

The frequency modulation continuous wave method is used for distance measurement. The main control unit 1 of the monitoring device controls the emission of electromagnetic waves. After encountering the ground, trees, buildings, etc., it is reflected back, and a delay time T is required. Let the distance between the monitoring device and the measured object be L. If the distance unit receives the returned electromagnetic wave within the time T, then 2L=CT, where C is the electromagnetic wave propagation speed, T can be obtained through calculation and processing by using the monitoring main control board, then the obtainable L=CT/2, that is, The distance from the monitoring device to the measured object (ground, trees, buildings) can be used to obtain the actual sag L of the transmission wire.

In the process of measuring the distance information between the object and the measuring point using the microwave radar ranging sensor 3 in the sag measuring device of the high-voltage transmission line, only the frequency delay effect is generated, that is, due to the delay of the transmission time, the transmitted signal at the same moment is different from the The echo signals differ in frequency.

When the measuring object is stationary, the modulation signal of the voltage-controlled oscillator in the microwave radar ranging sensor 3 is a sawtooth wave, which is because the anti-interference ability of the sawtooth wave is stronger than that of the triangular wave; Wave signal, the frequency range of the FM continuous wave signal is △f.

The FM continuous wave signal goes out through the radio frequency antenna 12, and returns when encountering the object to be measured. After a time delay τ, the reflected wave is captured by the radar receiving antenna of the microwave radar ranging sensor 3 and sent to the microwave radar ranging sensor 3 The built-in mixer performs mixing processing; at this time, the echo signal is the same as the transmitted wave waveform, but there is a time delay τ, which is the time it takes for the electromagnetic wave to go back and forth between the sensor and the object to be measured; and the two The distance between them is directly proportional, that is, τ=2L/C, where L represents the measurement distance and C is the speed of light.

The radar sensor is composed of a signal source part, a frequency mixing output part, and a signal transceiver part.

After the transmitted signal and the echo signal are mixed, the difference frequency is f _b , then:

f _b (t)=f(t)-f(t-τ);

Among them, the frequency relationship between the transmitted signal and the received signal is shown in Figure 3, and it can be known from the triangle similarity:

f _b /τ=△f/T;

Right now $T=\mathrm{\&tau;}\frac{\mathrm{\&Delta;\; f}}{f_b};$

According to τ=2L/C, it is concluded that:

$\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Cf\; b"\; filenames="HDA00003413854400011.png"\; state="\{\{state\}\}">Cf</figure-callout></span><figure-callout\; id="2"\; label="Cf\; b"\; filenames="HDA00003413854400011.png"\; state="\{\{state\}\}">\; </figure-callout>}}_{\mathrm{<span\; class="notranslate">\; </span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&Delta;f</span>}}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ;</span>$

From the above formula (1), it can be seen that the speed of light C is a constant, and the distance L obtained is related to the difference frequency f _b , the frequency modulation range △F and the modulation cycle T when the measured object is stationary; in the frequency modulation range △f and the modulation cycle T T When the previous setting is completed, the output signal of the radar channel contains the beat frequency f _b which is closely and uniquely related to the distance, and the resulting distance can be obtained through signal processing.

Claims (10)

1. The sag measurement device for high-voltage transmission wires is characterized in that it includes a measurement device housing, the measurement device housing is arranged on the power transmission wire (11), and the surface of the measurement device housing is respectively provided with radar waveguide ports ( 13), wireless radio frequency antenna (12), the measuring device casing includes a monitoring device main control unit (1), and the monitoring device main control unit (1) includes a central processing unit (2), and the central processing The unit (2) is respectively connected to the radar sensor unit (9) and the power supply unit (10) through wires, and the central processing unit (2) is also connected to the data monitoring terminal and the monitoring center on the transmission tower through the communication module (7). communication equipment connection. 2. The device for measuring sag of high-voltage transmission wire according to claim 1, characterized in that, the housing of the measurement device is set at the place where the sag of the transmission wire (11) is the largest; the housing of the measurement device is made of iron or alloy production. 3. The sag measuring device for high-voltage transmission wires according to claim 1, characterized in that the radar waveguide port (13) provided on the surface of the measuring device housing is horn-shaped, and the radar waveguide port (13) faces Measure objects. 4. The sag measurement device for high-voltage transmission wires according to claim 1, characterized in that the communication module (7) adopts a ZigBee module or an RF radio frequency module with ad hoc network function. 5. The high-voltage transmission wire sag measuring device according to claim 1, characterized in that, the radar sensor unit (9) includes an A/D conversion unit (8) and a microwave radar ranging sensor connected sequentially through wires (3). 6. The sag measuring device for high-voltage transmission conductors according to claim 1, characterized in that, the power supply unit (10) includes a power control circuit unit (4), and the power control circuit unit (4) passes through The wires are connected with a charging and discharging battery (5) and a wire induction power-taking unit (6). 7. The device for measuring sag of high-voltage transmission wires according to claim 6, characterized in that the wire induction power-taking unit (6) adopts a bayonet type. 8. The measuring method for measuring sag by a high-voltage transmission conductor sag measurement device, the measurement method is based on the high-voltage transmission conductor sag measurement device according to claim 1, and is characterized in that, specifically implemented according to the following steps: Step 1. Set the housing of the measuring device at the place where the sag of the transmission wire (11) is the largest; Step 2, using the radar sensor unit (9) to transmit the collected sag information to the central processing unit (2): Step 3. Using the transmission conductor sag algorithm module in the central processing unit (2) to perform calculations to obtain the sag value of the transmission conductor. 9. according to claim 8. The method for measuring sag of high-voltage transmission conductor sag measurement device, is characterized in that, described step 2 is specifically implemented according to the following steps: Step 2.1, using the microwave radar sensor (3) in the radar sensor unit (9) to collect the analog signal of the sag information of the transmission wire, and transmitting the analog signal of the sag information of the transmission wire to the A/D conversion unit (8); Step 2.2, after step 2.1, the A/D conversion unit (8) converts the analog signal of the sag information of the transmission wire into a digital signal; Step 2.3, the A/D conversion unit (8) transmits the digital signal in step 2.2 to the central processing unit (2). 10. according to claim 8. The method for measuring sag of high-voltage transmission conductor sag measuring device, is characterized in that, described step 3 is specifically implemented according to the following steps: Step 3.1, using the transmission conductor sag algorithm module set in the central processing unit (2) and the transmission conductor sag information obtained in step 2 to calculate the sag value L of the transmission conductor, specifically according to the following algorithm: $\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Cf</span>}}_{\mathrm{<span\; class="notranslate">\; b</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&Delta;f</span>}}\mathrm{<span\; class="notranslate">\; T</span>}<span\; class="notranslate">\; ;</span>$ In the formula, f _b is the difference frequency, △f is the frequency modulation range, T is the modulation period, and C is the electromagnetic wave propagation speed. Step 3.2. Send the sag value L of the transmission wire obtained in step 3.1 to the data monitoring terminal on the transmission tower through the communication module (7) via the ZigBee network, and then the data monitoring terminal finally sends it to the communication equipment in the monitoring center.

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