CN201429408Y - Extra-high voltage transmission line tilt angle monitoring device - Google Patents

Abstract

An inclination monitoring device for UHV transmission lines of the utility model comprises: an inclination sensor, a communication interface and a microprocessor; the inclination sensor is used to monitor the inclination of the pole tower and the insulator string of the transmission line, and passes the monitored inclination through The communication interface sends to the microprocessor; the inclination angle sensor adopts a micromechanical structure and integrates a magnetoresistive chip; the communication interface is used to convert the inclination detected by the inclination angle sensor into a signal type accepted by the microprocessor; the microprocessor, It is used to perform linear correction and temperature compensation processing on the signal converted by the communication interface, and then make a difference with the pre-measured initial value, and judge whether the tower and insulator string of the transmission line are tilted through the difference value, and if so, send an alarm signal to command center. The sensor adopts a micro-mechanical structure to solve the defect of poor shock resistance of existing inclination angle sensors, and can accurately measure the inclination of towers and insulator strings of transmission lines with high precision.

Description

An inclination monitoring device for UHV transmission lines

technical field

The utility model relates to the technical field of high-voltage equipment, in particular to an inclination monitoring device for ultra-high voltage transmission lines.

Background technique

At present, with the advancement of science and technology and the modernization of industry and agriculture, people's living standards continue to improve, and electricity consumption has risen sharply, which has put forward higher and higher requirements for the safety and reliability of power grid power supply. Overhead high-voltage transmission lines are the arteries of the power system. High-voltage transmission cables and towers are densely distributed in every corner, and their operating status directly determines the safety and efficiency of the power system. With the large-scale mining of coal mines in recent years, underground goafs of various shapes have been caused, causing a series of engineering geological disasters such as ground subsidence and fractures. Most of these goaf subsidence areas are widely distributed and extend far. Transmission lines in these areas are light If it is serious, it will cause the foundation to tilt, crack, and the tower is deformed. If it is serious, it will cause the foundation to sink and the tower to topple, which seriously threatens the safe operation of the transmission line.

Therefore, it is necessary to monitor the safe operation of transmission lines. For gobs and areas with sloping terrain, the inclination of the transmission line should be monitored especially. Once the inclination of the transmission tower is found, the alarm will be reported in time to avoid large-scale power outages for maintenance accidents.

At present, my country has built the first 1000kV UHV transmission system. The transmission towers of UHV transmission lines are large in size and bear heavy pressure on the transmission wires. Therefore, it is very important to monitor the safety of UHV transmission lines.

However, the existing devices for monitoring the inclination of transmission towers can monitor the inclination with low precision, and are easily interfered by the electromagnetic environment on site.

Utility model content

The technical problem to be solved by the utility model is to provide an inclination monitoring device for UHV transmission lines, which can accurately monitor the inclination of the transmission lines with high precision.

The utility model provides an inclination monitoring device for UHV transmission lines, which comprises: an inclination angle sensor, a communication interface and a microprocessor;

The inclination angle sensor is used to monitor the inclination of the tower and/or insulator string of the transmission line, and sends the monitored inclination to the microprocessor through the communication interface; the inclination angle sensor adopts a microprocessor Mechanical structure, integrated magnetoresistor chip;

The communication interface is used to convert the inclination monitored by the inclination sensor into a signal type accepted by the microprocessor;

The microprocessor is used to perform linear correction and temperature compensation processing on the signal converted by the communication interface, and then make a difference with the pre-measured initial value, and judge whether the pole tower and/or insulator string of the transmission line is damaged by the difference value. Tilt, if yes, then send an alarm signal to the command center.

Preferably, the magnetoresistor chip senses changes in two axes, the first plane is determined by these two axes, and the first plane is compared with a reference plane to obtain a measured inclination.

Preferably, the inclination angle sensor is provided with a shielding box for avoiding the interference of the UHV magnetic field.

Preferably, the transmission signal lines between the inclination angle sensor and the communication interface, and between the communication interface and the microprocessor are double-layer shielded lines; wherein,

The outer layer shielding of the double-layer shielded wire is grounded at the iron head of the insulator of the power transmission tower;

The inner shield of the double-layer shielded wire is grounded at the position of the monitoring device.

Preferably, an analog-to-digital converter is integrated inside the tilt angle sensor, and the analog-to-digital converter is used to convert the analog signal sensed by the magnetoresistor chip into a digital signal.

Preferably, the communication interface is a 485 interface.

Preferably, the microprocessor is a single-chip microcomputer.

Preferably, the range of the angle monitored by the tilt angle sensor is ±90 degrees.

Compared with the prior art, the utility model has the following advantages:

The inclination monitoring device of the UHV transmission line provided by the utility model can non-contact monitor the inclination of the pole tower and/or insulator string of the transmission line through the inclination sensor integrated with the magnetoresistor chip, and the magnetoresistor chip can greatly improve the inclination angle Sensor reliability and frequency response performance. The microprocessor performs linear correction and temperature compensation on the inclination monitored by the inclination sensor, so that the temperature drift is very small when it is used at high temperature. Moreover, the sensor adopts a micro-mechanical structure to well solve the defect of poor shock resistance of the existing tilt angle sensor. Therefore, the inclination angle sensor provided by the utility model can accurately measure the inclination of the tower and/or the insulator string of the power transmission line, and has high precision.

Description of drawings

Fig. 1 is a structural diagram of the first embodiment of the device based on the present invention;

Fig. 2 is a structure diagram of the tilt angle sensor based on the utility model.

Detailed ways

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings.

Referring to Fig. 1, this figure is a structural diagram of the first embodiment of the device based on the present invention.

The inclination monitoring device of the UHV transmission line provided by the embodiment of the present invention includes: an inclination angle sensor 101 , a communication interface 102 and a microprocessor 103 .

The tilt angle sensor 101 is used to monitor the tilt of the tower and/or the insulator string of the power transmission line, and send the monitored tilt to the microprocessor 103 through the communication interface 102 .

The inclination angle sensor 101 adopts a micro-mechanical structure and integrates a magnetoresistive chip.

The micro-mechanical structure adopted by the inclination angle sensor 101 can well solve the defect of poor vibration resistance of existing inclination angle sensors.

The communication interface 102 is used to convert the inclination monitored by the inclination sensor 101 into a signal type accepted by the microprocessor 103 .

It should be noted that the communication interface described in the embodiment of the present invention is preferably not limited to the 485 interface, and can be other types of standard industrial communication standards, such as: 20-40mA, 0-5V, 0-10V, etc.

The microprocessor 103 is used to perform linear correction and temperature compensation processing on the signal converted by the communication interface 102, and then make a difference with the pre-measured initial value, and judge the tower and/or insulator string of the transmission line through the difference Whether tilt occurs, and if yes, an alarm signal is sent to the command center.

The microprocessor performs linear correction on the received signal, which can make the obtained inclination more accurate. At the same time, the microprocessor can also perform temperature compensation on the received signal, which can make the temperature drift of the inclination angle sensor very small when it is used in a high temperature environment.

The inclination angle sensor provided in this embodiment can sense the inclination of the equipment to be monitored in a non-contact manner, so as to avoid interference from ultra-high-voltage electromagnetic fields.

It should be noted that the inclination monitoring device of the UHV transmission line provided in this embodiment is installed on the transmission tower or the insulator string for the first time to monitor the initial value of the inclination at the normal position. Based on this initial value, the inclination of real-time monitoring in the future is consistent with this The difference between the initial value is used to judge whether the transmission tower or the insulator string is tilted. The tilt angle monitored in this embodiment is a relative value obtained by making a difference from the initial value.

Referring to Fig. 2, this figure is a structural diagram of an inclination angle sensor based on the present invention.

The casing of the inclination angle sensor in this embodiment adopts a waterproof structure, which can effectively resist external interference.

The magnetoresistive chip 201 integrated in the inclination angle sensor can sense changes in two axes, as shown in FIG. 2 , two directions are the X axis and the Y axis. A first plane is determined with these two axes, said first plane is compared with a reference plane to obtain a measured inclination.

The reference plane may be a horizontal plane.

An analog-to-digital converter (not shown in FIG. 2 ) is integrated inside the tilt angle sensor, and the analog-to-digital converter is used to convert the analog signal sensed by the magnetoresistor chip into a digital signal.

It should be noted that, the analog-to-digital converter integrated inside the tilt-angle sensor may not be used, and other analog-to-digital converters may be connected outside the tilt-angle sensor.

The digital signal from the tilt angle sensor is transmitted to the 485 communication interface through the double-layer shielded wire 202 .

The 485 communication interface converts the digital signal into a signal type that the microprocessor can directly receive, and transmits it to the microprocessor through a double-layer shielded wire.

It should be noted that, in order to ensure that the transmission signal is free from interference, the transmission signal lines between the inclination angle sensor and the communication interface, and between the communication interface and the microprocessor are double-layer shielded lines; Wherein, the outer shield of the double-layer shielded wire is grounded at the iron head of the insulator of the power transmission tower; the inner shield of the double-layer shielded wire is grounded at the position of the monitoring device.

For the input interface of the sensor, anti-seepage, anti-interference, anti-lightning and other measures are also adopted to ensure the reliability of the interface.

The inclination angle sensor is provided with a shielding box to avoid the interference of the UHV magnetic field. Because the working environment of the inclination angle sensor has not only strong electric field interference, but also strong magnetic field interference, the system uses a double-layer shielded wire to introduce the collected signal and isolate the inner layer of the shielding box to prevent UHV strong magnetic field interference.

The microprocessor is a single-chip microcomputer. Of course, other types of microprocessors may also be used.

The angle range monitored by the inclination sensor provided in this embodiment is ±90 degrees, while the angle range that can be monitored by the inclination sensor in the prior art is relatively small, so that when the power transmission line has a large inclination, it cannot be monitored accurately. value.

It should be noted that the UHV transmission line inclination monitoring device provided by the utility model can monitor the windage angle of the wire, the inclination angle of the insulator string, the inclination angle of the ground wire and/or the inclination angle of the tower itself.

The inclination monitoring device of the UHV transmission line provided by the utility model can non-contact monitor the inclination of the pole tower and/or insulator string of the transmission line through the inclination sensor integrated with the magnetoresistor chip, and the magnetoresistor chip can greatly improve the inclination angle Sensor reliability and frequency response performance. The microprocessor performs linear correction and temperature compensation on the inclination monitored by the inclination sensor, so that the temperature shift is very small when used at high temperature. Moreover, the sensor adopts a micro-mechanical structure to well solve the defect of poor shock resistance of the existing tilt angle sensor. Therefore, the inclination angle sensor provided by the utility model can accurately measure the inclination of the tower and/or the insulator string of the power transmission line, and has high precision.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present utility model, can use the method and technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model, or modify it to an equivalent change Equivalent embodiment. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical proposal of the present invention.

Claims (8)

1. An inclination monitoring device for UHV transmission lines, comprising: an inclination sensor, a communication interface and a microprocessor; The inclination angle sensor is used to monitor the inclination of the tower and/or insulator string of the transmission line, and sends the monitored inclination to the microprocessor through the communication interface; the inclination angle sensor adopts a microprocessor Mechanical structure, integrated magnetoresistor chip; The communication interface is used to convert the inclination monitored by the inclination sensor into a signal type accepted by the microprocessor; The microprocessor is used to perform linear correction and temperature compensation processing on the signal converted by the communication interface, and then make a difference with the pre-measured initial value, and judge whether the pole tower and/or insulator string of the transmission line is damaged by the difference value. Tilt, if yes, then send an alarm signal to the command center. 2. The inclination monitoring device for UHV transmission lines according to claim 1, characterized in that the magnetoresistor chip senses changes in two axial directions, the first plane is determined by these two axial directions, and the second A plane is compared with a reference plane to obtain a measured inclination. 3. The inclination monitoring device for UHV transmission lines according to claim 1, characterized in that a shielding box is provided outside the inclination angle sensor to avoid the interference of UHV magnetic field. 4. The inclination monitoring device for UHV transmission lines according to claim 1, characterized in that the transmission signals between the inclination sensor and the communication interface, and between the communication interface and the microprocessor The wires are double-layer shielded wires; among them, The outer layer shielding of the double-layer shielded wire is grounded at the iron head of the insulator of the power transmission tower; The inner shield of the double-layer shielded wire is grounded at the position of the monitoring device. 5. The inclination monitoring device for UHV transmission lines according to claim 1, wherein an analog-to-digital converter is integrated inside the inclination angle sensor, and the analog-to-digital converter is used to sense the magnetoresistor chip to The analog signal is converted into a digital signal. 6. The inclination monitoring device for UHV transmission lines according to claim 1, wherein the communication interface is a 485 interface. 7. The inclination monitoring device for UHV transmission lines according to claim 1, wherein the microprocessor is a single-chip microcomputer. 8. The inclination monitoring device for UHV transmission lines according to claim 1, characterized in that the range of the angle monitored by the inclination sensor is ±90 degrees.

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