CN202304896U - On-line swing monitoring system for overhead transmission line - Google Patents

Abstract

The utility model belongs to the technical field of transmission line status monitoring, and is an on-line monitoring system for galloping of overhead transmission lines. It consists of two monitoring master stations on the tower and a background monitoring host computer installed in the monitoring center. It uses two master stations and several sub-stations to monitor the galloping state of a span line. The sub-stations use acceleration sensors to accurately locate the galloping of the line. The positioning data is uploaded to the master station through short-range radio frequency. Each master station receives four closer The dancing monitoring data of the sub-station uploads the monitoring data and environmental meteorological data to the background host computer through GPRS. Each master station performs time synchronization through the GPS module to ensure the synchronization of uploaded data. The system of the utility model has the advantages of small volume, little influence on the mechanical characteristics of the line, good dynamic performance, high data monitoring precision, low cost and can work around the clock.

Description

Galloping Online Monitoring System for Overhead Transmission Lines

technical field

The utility model belongs to the technical field of state monitoring of transmission lines, and relates to an on-line galloping monitoring system of overhead transmission lines, in particular to an on-line galloping monitoring system of overhead lines based on short-range radio frequency/acceleration sensor/GPS.

Background technique

The reliability of power grid transmission largely depends on the reliability of the working state of the transmission line. Overhead transmission lines operate in the open air for a long time, and are greatly affected by natural conditions such as wind, rain, ice, lightning, etc., and their working status cannot be guaranteed. Especially when abnormal conditions such as wind deflection and galloping occur, accidents such as flashover, tripping, and even tower collapse may occur on the line.

my country has a vast territory and variable climate, and the occurrence rules and internal mechanisms of wind deviation and galloping anomalies are different. Especially in recent years, due to the influence of global climate and environment changes, the climate conditions such as rainfall, sunshine intensity, wind force and direction, temperature and humidity in coastal areas are different from those in inland areas year by year. Data related to inland areas cannot be referred to for the probability of occurrence. In order to quickly and effectively inquire about the causes of accidents, reduce the economic losses caused by line accidents, accurately warn of accidents, and provide detailed scientific data and theoretical basis for transmission line design and technical transformation, it is necessary to analyze the abnormal conditions of lines in coastal areas and various Carry out research on the causal relationship corresponding to various environments and meteorological data, and find out the causes and laws of wind deviation and galloping. The central wind force of the unique coastal typhoon climate can reach level 17 or above. In order to further analyze the root cause and law of the wind deviation and galloping state of the line in the coastal area, it is necessary to analyze the wind deviation and galloping state of the ice-free line induced by strong wind conditions. research.

Since 2000, there have been many accidents caused by abnormal conditions such as wind deflection and galloping of transmission lines in the domestic power grid. Therefore, various research institutions have conducted a lot of research on the development of transmission line state analysis theory and monitoring system. The Chinese invention patent "GPS-based transmission conductor galloping monitoring system and monitoring method" with the application publication number "CN 101975565A" discloses a GPS-based transmission conductor galloping monitoring system and monitoring method, but its positioning error is relatively large, generally 1 to 10 meters. The Chinese invention patent "on-line monitoring system for galloping and wind deviation of transmission line conductors based on differential GPS" with the application publication number "CN 101986100A" discloses an online monitoring system for wind deviation and galloping of transmission lines based on differential GPS, although its positioning It is more accurate, but it needs to establish a differential GPS base station, and the cost is too high. The Chinese invention patent "on-line galloping monitoring system of transmission lines based on acceleration sensor" with the application publication number "CN 101571413A" discloses an online galloping monitoring system of transmission lines based on acceleration sensors. One line span is equipped with one master station and multiple The distance between the sub-station and the main station is relatively long, and the data of the sub-station needs to be uploaded to the main station by a high-power radio frequency. The high-power radio frequency module is large in size and high in cost, which will affect the dynamic characteristics of the line dancing and pose a potential threat to the line dancing. The utility model discloses an overhead line galloping online monitoring system based on short-range radio frequency/acceleration sensor/GPS. The system has small volume, little influence on line mechanical properties, good dynamic performance, high data monitoring accuracy, low cost and can work around the clock.

Contents of the invention

The technical problem to be solved by the utility model is to aim at the deficiencies of the prior art, to provide a reasonable structure, easy to use, capable of on-line monitoring of the on-site temperature, humidity, wind speed, wind direction, sunshine intensity and conductor temperature, gravity, A transmission line galloping online monitoring system for parameters such as galloping amplitude.

In order to achieve the above purpose, the utility model adopts the following technical solutions: the utility model is an on-line monitoring system for galloping of overhead transmission lines, which is characterized in that the on-line monitoring system of each span line consists of several monitoring systems installed on the transmission line Substation, two monitoring master stations respectively installed on the pole tower and background monitoring host computer installed in the monitoring center;

Described monitoring sub-station comprises STM32 single-chip microcomputer, is connected with intelligent protection CT power supply, wire temperature sensor, acceleration sensor and RF radio frequency module on STM32 single-chip computer; Wire temperature sensor is connected with the AD pin of described STM32 single-chip computer; Acceleration sensor Be connected with the I ² C pin of described STM32 single-chip microcomputer; The RF radio frequency module is connected with the UART pin of described STM32 single-chip microcomputer; Close to the monitoring master station;

Described monitoring master station comprises STM32 single-chip microcomputer master station control system, power supply module, GPRS module, RF radio frequency module, GPS module, environment temperature and humidity sensor, wind speed and wind direction sensor, sunshine radiation sensor and rainfall sensor; GPRS module, RF radio frequency module, The GPS module is connected with the UART pin of the STM32 single-chip master station control system; the ambient temperature and humidity sensor is connected with the SPI pin of the STM32 single-chip master station control system; The AD pin of the station control system is connected; the power supply module includes a photovoltaic power supply, the photovoltaic power supply is connected in series with the control module, then connected in parallel with the storage battery, and finally connected in series with the load;

Each monitoring master station receives the dancing monitoring data of the nearby monitoring sub-stations, and uploads the monitoring data and environmental meteorological data to the background monitoring host computer through the GPRS module; the time synchronization is performed through the GPS module to ensure the synchronization of the uploaded data.

In the utility model overhead transmission line galloping online monitoring system: the intelligent protection CT power supply can use the commonly used intelligent power supply or CT power supply disclosed in the prior art, and the preferred intelligent protection CT power supply includes a power taking module, an electric energy conditioning module, and an intelligent protection module;

The power-taking module includes a primary busbar, a current transformer core, a secondary coil, a sampling resistor, and a single-pole double-throw relay; the primary busbar passes through the current transformer core; the secondary coil is wound on the current transformer core , and connected in parallel with the sampling resistor, and then connected in series with the SPDT relay;

The power conditioning module includes a rectifier circuit, a tip discharge circuit, a ripple filter capacitor, and a voltage stabilizing circuit, and each circuit is connected in series in sequence; the tip discharge circuit includes a voltage regulator tube, a voltage regulator tube and a voltage regulator circuit. The tube current-limiting resistor is connected in parallel with the DC output of the rectifier bridge after being connected in series, and another current-limiting resistor is connected in parallel in the middle.

The intelligent protection circuit includes a STM8 single-chip microcomputer, an RF radio frequency module and a super capacitor; the RF radio frequency module is connected to the UART pin of the STM8 single chip microcomputer; and the super capacitor is connected in parallel to the power supply end of the STM8 single chip microcomputer.

In the technical scheme of the galloping online monitoring system for overhead transmission lines of the utility model, the components, modules and control systems disclosed in the prior art and applicable to the utility model can be used unless otherwise specified. .

The number of the monitoring sub-stations on each span line in the utility model is set as required, according to the length of the line during setting, generally the monitoring sub-stations on each span line are about 8.

Expert analysis software can be installed on the background monitoring host computer described in the utility model; it is preferable to have the following functions: display and store monitoring data, provide various parameters for dispatchers to understand line safety, timely maintenance and prevention and control.

The monitoring sub-station is powered by an intelligent protection CT power supply, the monitoring master station is powered by a power supply module, and the background monitoring host computer can be powered by commercial power. 433MHz short-range RF technology can be used for communication between the monitoring sub-station and the monitoring master station, and GPRS long-distance wireless technology is used for communication between the monitoring master station and the monitoring host computer. When the high-voltage side line current is too large, the tip discharge circuit converts excess induced electric energy into thermal energy for discharge. When the temperature rise of the discharge protection circuit is too high, the intelligent protection module will cut off the power supply circuit until the temperature of the power supply drops to the allowable working temperature.

Compared with the prior art, the system of the utility model has small volume, little influence on the mechanical characteristics of the line, good dynamic performance, high data monitoring precision, low cost, and can work around the clock. Due to the combination of acceleration sensor/GPS, it can not only accurately locate but also ensure the synchronization of uploaded data, and the cost is much lower than that of building a differential GPS base station. The application of the utility model can save manpower, material resources and time, avoid large-scale blackout accidents, provide powerful measures for safe power transmission, and can be widely used on high-voltage transmission lines.

Description of drawings

Fig. 1 is a kind of setting diagram of the utility model;

Fig. 2 is the structural block diagram of the monitoring substation of the present utility model;

Fig. 3 is a schematic block diagram of the structure of the intelligent protection CT power supply of the present invention;

Fig. 4 is the structural block diagram of the monitoring master station of the present utility model;

Fig. 5 is a schematic block diagram of the structure of the power supply module of the present invention.

Detailed ways

The specific technical solutions of the utility model will be further described below with reference to the accompanying drawings, so that those skilled in the art can further understand the utility model without constituting a limitation on the rights thereof.

Embodiment 1, referring to Figures 1-5, an on-line monitoring system for galloping of overhead transmission lines, distributed on transmission lines that require galloping monitoring, as shown in Figure 1, the online monitoring system within each line span is installed on the transmission line It consists of eight monitoring sub-stations 1 on the line, two monitoring master stations 2 installed on pole towers, and a monitoring host computer 3 installed in the monitoring center. The monitoring sub-station 1 communicates with the nearby monitoring master station 2 through short-range RF technology; the monitoring master station 2 communicates with the monitoring host computer 3 through GPRS technology.

As shown in FIG. 2 , the monitoring substation 1 includes an STM32 single-chip microcomputer 11 , an intelligent protection CT power supply 12 , a wire temperature sensor 13 , an acceleration sensor 14 , and an RF radio frequency module 15 . The wire temperature sensor 13 (thermistor MF52 can be used) and the acceleration sensor 14 (MMA7455) store the measured wire temperature and galloping parameters in the STM32 microcontroller 11, and send the data to the monitoring master station through the RF radio frequency module 15 (Si4432) 2. During operation, the monitoring substation 1 is powered by an intelligent protection CT power supply 12 .

As shown in FIG. 3 , the intelligent protection CT power supply 12 includes a power taking module 121, a power conditioning module 122, and an intelligent protection module 123;

The power-taking module includes a primary busbar 1211, a current transformer core 1212, a secondary coil 1213, a sampling resistor 1214, and a single-pole double-throw relay 1215; the primary busbar 1211 passes through the current transformer core 1212; the secondary coil 1213 wound on the magnetic core 1212 of the current transformer, connected in parallel with the sampling resistor 1214, and connected in series with the SPDT relay 1215;

The power conditioning module includes a rectifier circuit 1221, a tip discharge circuit 1222, a ripple filter capacitor 1223, and a voltage stabilizing circuit 1224; each circuit is connected in series in sequence; the tip discharge circuit 1222 includes a voltage regulator tube, stabilizing The voltage tube and the Zener tube current-limiting resistor are connected in parallel with the DC output of the rectifier bridge, and another current-limiting resistor is connected in parallel in the middle. The current-limiting resistor is connected to the gate of the power tube to control the voltage at which the power tube is turned on or off

The intelligent protection module includes STM8 single-chip microcomputer 1231, RF radio frequency module 15 and supercapacitor. The RF module 15 is connected to the UART pin of the STM8 single-chip microcomputer 1231;

The primary busbar 1211 has an alternating current with a constant amplitude, and an alternating magnetic field will be generated around the line, and an alternating magnetic flux will be generated on the iron core 1212, and this magnetic flux will be induced on the induction coil 1213 an alternating induced current. The induced current becomes an electromotive force output on the sampling resistor 1214 . Under the condition that the SPDT relay 1215 (JQC-3F) is closed, the induced electromotive force is rectified by the rectifier circuit 1221 and then becomes a pulsating DC voltage. After the pulsating direct current voltage passes through the tip discharge circuit 1222 , the peak energy of the pulsating direct current is released, and then the larger voltage ripple can be filtered out by the filter capacitor 1223 . Finally, the voltage is reduced to 5.5V by the regulator circuit 1224 for use.

During the operation of the entire circuit, the single-chip control module 1231 can monitor the operating temperature of the tip bleeder circuit 1222, and preset the temperature exceeding threshold, recovery threshold and exceeding time period. After the operating temperature exceeds the standard, the single-chip microcomputer control module 1231 disconnects the power supply circuit through the SPDT relay 1215 until the operating temperature of the tip discharge circuit 1222 enters the recovery threshold, and the SPDT relay 1215 reconnects power supply circuit. After the power supply is disconnected, the single-chip microcomputer control module 1231 is powered by an internal supercapacitor. When the operating temperature of the tip discharge circuit 1222 cannot enter the recovery threshold within the preset exceeding time period, the RF radio frequency module 15 starts up and sends a power device failure command.

As shown in Figure 4, described monitoring master station 2 comprises STM32 single-chip microcomputer master station control system 21, power supply module 22, GPRS module 23, RF radio frequency module 15, GPS module 25, environment temperature and humidity sensor 26, wind speed wind direction sensor 27, sunshine Radiation sensor 28, rain sensor 29. Environmental temperature and humidity sensor 26 (SHT71), wind speed and wind direction sensor 27 (BCQ-FS-BA), sunshine radiation sensor 28 (GZD system), rain sensor (WD211) store the measured environmental parameters in the STM32 microcontroller control system 21, These data and the data measured in the monitoring sub-station 1 received by the RF radio frequency module 15 (Si4432) are sent to the monitoring center 3 through the GPRS module 23 (EM310). During operation, the power supply module 22 supplies power to the monitoring master station 2; the GPS module 25 (EM310) performs time synchronization to ensure the synchronization of uploaded data.

As shown in FIG. 5 , the power supply module 22 is composed of a solar photovoltaic power supply 221 , a storage battery 222 and a control module 223 . The photovoltaic power supply 221 performs power conditioning through the control module to charge the battery 222, and then the battery supplies power to the rear load.

The monitoring sub-station of this embodiment utilizes the acceleration sensor to accurately locate the line galloping, and the positioning data is uploaded to the monitoring master station through short-range radio frequency, and each monitoring master station receives the dancing monitoring data of four closer monitoring sub-stations, and monitor The data and environmental meteorological data are uploaded to the background monitoring host computer. Each monitoring master station performs time synchronization through the GPS module to ensure the synchronization of uploaded data.

Claims (2)

1. overhead transmission line galloping on-line monitoring system is characterized in that: the on-line monitoring system of each span circuit is made up of the background monitoring host computer that is installed in several monitoring sub-stations on the transmission line of electricity, be installed in two monitoring main websites on the shaft tower and be installed in Surveillance center respectively;

Described monitoring sub-station comprises the STM32 single-chip microcomputer, on the STM32 single-chip microcomputer, is connected with intelligent protection CT power supply, wire temperature sensor, acceleration transducer and RF radio-frequency module; Wire temperature sensor is connected with the AD pin of said STM32 single-chip microcomputer; The I of acceleration transducer and said STM32 single-chip microcomputer ²The C pin is connected; The RF radio-frequency module is connected with the UART pin of said STM32 single-chip microcomputer; Monitoring sub-station utilizes acceleration transducer that circuit is waved accurately and locatees, and locator data is uploaded to nearer monitoring main website through the RF radio-frequency module;

Described monitoring main website comprises STM32 single-chip microcomputer main website control system, supply module, GPRS module, RF radio-frequency module, GPS module, ambient temperature and humidity sensor, wind speed wind direction sensor, sunshine radiation sensor and rain sensor; GPRS module, RF radio-frequency module, GPS module are connected with the UART pin of described STM32 single-chip microcomputer main website control system; The ambient temperature and humidity sensor is connected with the SPI pin of STM32 single-chip microcomputer main website control system; Wind speed wind direction sensor, sunshine, radiation sensor was connected with the AD pin of STM32 single-chip microcomputer main website control system with rain sensor; Described supply module comprises photo-voltaic power supply, and photo-voltaic power supply is connected with control module, and is parallelly connected with accumulator again, connects with load at last;

Each monitoring main website receives the Monitoring Data of waving of nearer monitoring sub-station, through the GPRS module with Monitoring Data and environment weather data upload to background monitoring host computer; Through the GPS module carry out to the time, guarantee to upload synchronization of data property.

2. overhead transmission line galloping on-line monitoring system according to claim 1 is characterized in that: said intelligent protection CT power supply comprises electricity-fetching module, electric energy conditioning module, intelligent protection module;

Said electricity-fetching module contains bus, current transformer core, secondary coil, sample resistance, single-pole double-throw (SPDT) relay; One time bus passes said current transformer core; Secondary coil is on current transformer core, and is and parallelly connected with sample resistance, connects with the single-pole double-throw (SPDT) relay again;

Said electric energy conditioning module contains rectification circuit, most advanced and sophisticated leadage circuit, ripple filtering electric capacity, mu balanced circuit, is connected in series successively between each circuit; Described most advanced and sophisticated leadage circuit comprises stabilivolt; Stabilivolt is connected with the stabilivolt current-limiting resistance afterwards and the direct current output-parallel of rectifier bridge; Another current-limiting resistance of parallel connection wherein, this current-limiting resistance links to each other with the power tube gate pole, with the voltage of conducting of power controlling pipe or shutoff;

Said intelligent protection circuit comprises STM8 single-chip microcomputer, RF radio-frequency module and super capacitor; The RF radio-frequency module is connected with the UART pin of said STM8 single-chip microcomputer; Super capacitor is connected in parallel on the feeder ear of said STM8 single-chip microcomputer.

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