KR200333492Y1 - Collection System for Fault Information of Overhead Transmission Line - Google Patents

Abstract

The present invention relates to a system for collecting fault information on overhead transmission lines that enables the user to quickly and accurately grasp the short circuit fault, ground fault and lightning occurrence of overhead transmission lines, and is intended for short circuit and ground fault protection installed at substations at both ends of transmission lines. Determine the name and phase of the line according to the operation status of the distance relay, and use the abnormal current sensing device installed in each tower to detect the information of each tower, and to carry out Article 30 of the Radio Law Enforcement Decree. Application program that collects the transmission line information management PC or Internet Web Server by relay transmission of the wireless communication terminal (hereinafter referred to as short-range wireless communication) according to the provisions of this standard and accurately determines and displays the fault location by using the collected data. Or a Web program, not only the manager in charge but also the PC, PDA, or Mobile Pho It is possible to search in ne, etc. It is characterized in that it is possible to quickly troubleshoot and manage the transmission line efficiently.

Description

Collection System for Fault Information of Overhead Transmission Line

The present invention relates to a failure information collection system for overhead transmission line which enables to promptly respond and recover by accurately displaying the failure point when various failures occur in the overhead transmission line which transfers large electric power.

As the modern society has rapidly changed to industrialization and urbanization with the development of material civilization, the demand for electric power has expanded rapidly. Recently, as the advanced information age has advanced, high reliability and high quality power supply is required. Therefore, as the number of power generation facilities increases, the number of transmission and transmission facilities and distribution facilities increases, and the transmission system is complicated, so that the efficiency and speed of transmission system operation is required.

However, even though the failure of transmission facilities that transfer large power has a great negative effect on the power supply system, most of the transmission facilities have passed through mountainous areas, and when a failure occurs, a lot of manpower and time is required during the line trip to find the failure. At the same time, no quick action is taken. In some cases, it takes more time or manpower to find the point of an accident than the time or manpower required to recover the accident.

Against this background, there was a need for a system for collecting fault information on overhead transmission line, which can monitor various abnormalities in transmission line in real time.

To this need, the state of the art to date has almost escaped from the primitive method. In other words, check the operation status according to the percentage of correction of zone-1, zone-2 and zone-3 elements of short-circuit or ground fault protection distance relay installed in the substation, and whether Carrier Trip of the switch is operated. It is necessary to determine whether it is within 15% of the transmission line, within 15% of the opposite substation, or 70% of the middle part of both substations, and conduct line inspection and inspection in the area. This determination is based on the assumption that the error of the protective relay is within the valid value and the forward operation of the protective relay.

In the case of a lightning strike, there is a "lightning indicator" of registration number 20-0201727 (Registration date: August 23, 2000), which is found in the Registered Utility Model Publication. As the display cloth is unfolded, it is possible to check the operation of the track patrolman at a long distance. Therefore, this technique only makes it possible to recognize the information about lightning strikes in a short time through the rough track sequence, and it also does not function at all for other abnormalities such as short circuits and ground faults.

In recent years, it is possible to estimate more advanced failure points in transmission lines employing digital distance relays, and to estimate the lightning points by operating the lightning system installed at KEPCO's regional power supply stations. lost. However, even though these expensive facilities have been installed, the present situation does not provide accurate spans or points.

The present invention is to solve the above-mentioned problems, install an abnormal current detection device for each of the towers that are the support of the overhead transmission line to detect the abnormal current state of each tower, and the detected data to implement Article 30 The wireless communication method (hereinafter referred to as short-range wireless communication method) according to the provisions of (a radio station that can be established without notification) is collected by a transmission line information management computer or an Internet web server by relay transmission of terminals and collected data. By using the application program or web program to accurately determine and display the fault location, it is possible to search not only the manager in charge but also the PC, PDA, mobile phone, etc. of related departments for quick trouble recovery and efficient transmission line management. To make it possible.

In order to achieve this purpose, a central information collecting device for a track, a detecting device for detecting abnormal currents flowing through a steel tower, a short-range wireless communication terminal for transmitting the detected data to a central collecting device, a communication program thereof, and a short-range wireless communication A power supply for supplying power to the terminal and a data processing computer or Web server PC for processing the information collected by the central collecting device are required.

But how do you detect abnormal currents in your towers and how do you secure power for detectors and wireless terminals in fields or mountain towers? And, "How can I collect data on transmission lines scattered several tens of kilometers in the short-range wireless communication method with a maximum communication distance of 500m?" These problems can be said to be a technical problem to be achieved by the present invention.

1A is an exemplary diagram illustrating a flow of communication data for collecting data to one central communication unit in a transmission line between A, B, and C substations.

Figure 1b is an exemplary embodiment showing the flow of communication data for collecting data to the two central communication in the transmission line between the A, B, C substation.

Figure 1c is an exemplary embodiment showing the flow of communication data collecting data to three central communication in the transmission line between the A, B, C substation.

2 is a block diagram of one embodiment of a fault detection receiver.

3 is a block diagram of an embodiment of a central communication unit 101.

FIG. 4A is a flowchart of a communication program for collecting data of the entire transmission line through short-range wireless communication with one central communication unit as in the exemplary diagram of FIG. 1A.

FIG. 4B is a flowchart of a communication program for collecting data of the entire transmission line by short-range wireless communication with two central communicators as in the exemplary diagram of FIG. 1B.

4C is a flowchart of a communication program for collecting data of the entire transmission line through short-range wireless communication with three central communicators as in the exemplary diagram of FIG. 1C.

In order to achieve the above objects, the basic principle of the overhead transmission line fault information collecting system of the present invention will be described first.

The overhead transmission line is supported by a steel tower every 300m in the standard span, and the conductors are separated from the steel towers by means of independence, and processed at the top of the tower so that the overhead line is located on the upper part of the track conductor for lightning protection. Support the branch line. In addition, since there is no insulation between the processing ground wire and the steel tower, the processing ground wire is directly grounded at every supporting steel tower. In addition, the Korean transmission system uses three-phase three-wire type irrespective of the voltage type, so that three conductors become one transmission line circuit when a single conductor is used regardless of a single conductor or a polyconductor. Therefore, when it is difficult to secure the construction site of the transmission line as it is today, a number of transmission lines are naturally installed in one pylon, and the four lines are multi-reflective, and there are also steel towers installed up to six lines.

In the transmission line installed and operated as above, if the charging current between conductor and overhead line is ideally balanced in the normal operation state, the ground current through the tower will be zero, but the current of each phase is also completely balanced. It is difficult and the geometric equilibrium of the conductor with respect to the overhead line is more difficult, so that a small amount of charging current always flows through the overhead line. However, in case of ground fault, short circuit, or lightning accident, a large current unbalanced current flows in the conductor, so that a lot of charging current flows to the processing ground and the ground current flows through the steel tower. At this time, almost all transmission lines are connected to the power system in a loop, and even if a fault occurs, both ends of the fault point become power and fault current flows from both ends. Current is detected. Therefore, the point of failure cannot be known from the magnitude of the detection current. However, with the fault point as the branch point, the ground currents of both sides have a difference in phase. By detecting and comparing this phase difference, a failure point can be judged correctly.

In the case of a lightning strike, a lightning current flows much higher than a ground fault or a short-circuit accident, and the closer the lightning strike is, the larger the lightning current is. Therefore, by comparing the magnitudes of the ground currents, it is possible to distinguish a ground fault or a short circuit accident.

And even if several lines are installed in one transmission line, this faulty transmission line information collection system accurately displays the span of failures in the transmission line path, and the failure of the transmission line with multiple transmission lines The indication of the generated transmission line can be judged by analyzing the operation status of relays or breakers at substations at both ends. Here, the transmission tower path is a term that is distinguished from the transmission line, and when the transmission tower is used as a support for the transmission line, it is not only used for any one transmission line but also a transmission line of another system may become a bottle. And two or more transmission lines that start together on either side may be divided along different paths in the middle. Therefore, a transmission tower group connected by one overhead line is considered as one transmission tower path.

The construction of the overhead transmission line fault information collecting system of the present invention for implementing the above principle can be divided into hardware and software.

First, the hardware division consists of three parts.

A fault detection transmitter (FDT = Fault Detector Transceiver) installed in each tower to detect abnormal current flowing through the tower and to transmit the detected data to a central communication system or to receive a signal from the central communication system;

A central communication unit (CCU = Central Communication Unit) for transmitting a communication signal to a fault detection transmitter or receiving data from the fault detection transmitter and a receiver, and transmitting the received data to a PC or a Web Server PC;

PC or Web Server PC that processes data. However, since it is generalized about PC or Web Server PC, explanation is omitted here.

The software sector consists of two parts.

The first is a communication program that collects data from each pylon status measuring transmitter to a central communication system using a short range wireless communication method. The fault detection transmitter and receiver installed in each tower are used as slave terminals, and the central communication unit is master. ), The long distance communication is made possible by overcoming the limited communication communication distance of each slave terminal by using a communication program capable of relay retransmission of each slave terminal.

The second is a PC program or a web program that processes the collected data. However, since the data processing PC program or the web program is generalized, description thereof is omitted here.

Therefore, the communication data flow of the entire system, and the two devices in the hardware section, that is, the fault detection transmitter and receiver, and the communication program in the software section will be described in detail with reference examples 1 to 4.

1A is an exemplary diagram illustrating a flow of communication data for collecting data to one central communication unit 100 in a transmission line between A, B, and C substations.

57 pylons are erected between substation A and substation B, and there are more than one transmission line wired to the pylons, and T- or π-branches in No. 32 pylon are connected to C substation through three pylons. will be. Therefore, between the slave terminal (1 ~ 60) and the master terminal of the central communication unit 100 installed in every tower from the first tower to the 60 tower, the data is collected by short-range wireless communication method, and the collected data to the wire (102) This is input to a computer or Web Server PC 101.

FIG. 1B is an exemplary diagram illustrating a flow of communication data for collecting data to two central communication units 110 and 111 in a transmission line between A, B, and C substations.

The configuration of the transmission line is almost similar to that of FIG. 1A, but the central communication unit (110, 111) is installed in two places of the A substation and the B substation to collect data by short-range wireless communication from both sides. It is a system reduced to two. In other words, substation A collects 34 pylon data through short range wireless communication, and substation B collects 26 pylon data through short range wireless communication, and collects communication identification numbers into separate groups. The data collection is performed in this way, but the data collected from the B substation side are immediately transmitted to the central communication unit 110 of the A substation through the wired communication 113 between the substations, and transmits the data of the entire transmission line to the wired 114. The data is input to the computer for data processing or the Web Server PC 112.

Figure 1c is an exemplary embodiment showing the flow of communication data to collect data to the three central communication unit (120, 121, 122) in the transmission line between the A, B, C substation.

The configuration of the transmission line is almost similar to that of FIG. 1A, but the central communication units 120, 121, and 122 are installed in three A, B, and C substations respectively to collect data through short-range wireless communication. It is a system that further reduces the collection time. That is, out of a total of 60 pylons, 28 pylon data is collected by short-range wireless communication at A substation, 22 pylon data are collected by short-range wireless communication at B substation, and 10 pylon data are collected at short-range wireless at C substation. It collects by communication, and the data collected from substation B and C substation is immediately transmitted to the central communication unit 120 of substation A using wired communication 124 between substations to collectively collect the data of the entire transmission line to the center of substation A The communicator 120 inputs the data processing computer or the Web Server PC 123 by the wire 125.

2 is a block diagram of one embodiment of a fault detection receiver.

When the current transformer 131 is installed in the steel tower and current is detected, analog / digital conversion is performed through linear detection and amplification 132 to input the magnitude of the detected current to the CPU 130, and on the other hand, the detected current. The zero cross point is detected through a zero cross detector 133 and input to the CPU 130. The CPU 130 determines the current event when the magnitude of the input current exceeds a predetermined value, and sets in advance the time of the zero cross point that should occur after the next half cycle based on the input zero cross point. The zero cross point actually inputted to the terminal is compared to determine a phase event when a phase difference of a predetermined value or more occurs. The current event and the phase event determined as described above are transmitted to the master through short range wireless communication through the RF module 134 of the short range wireless communication method. At this time, the identification number ID Nbr of the communication terminal of the own terminal is dip switch 135. Specify the setting of) and send it. In the method of determining the phase event, the peak event may be detected, the maximum point arrival time after the next half cycle is set in advance, and the phase event may be determined by comparing the maximum point arrival time which is input next. . At this time, when sampling the waveform of the input current, the period can be from 50㎲ to 1000㎲.

The power of such a system is the most reasonable way to install and supply the solar cell 136 and the storage battery 137 in consideration of the characteristics of the installation location of the transmission line pylons.

FIG. 3 is a block diagram illustrating an embodiment of a central communication unit. The RF module 141 transmits and receives data only with short-range wireless communication with slave terminals, and the wired communication port receives data of a corresponding transmission line collected by a central communication unit of a substation. By using wired communication installed between substations, it is possible to collect the entire data of the transmission line in the shortest time. The CPU 140 has a communication program for controlling such communications, and has a communication port for transmitting and receiving with a data processing computer or a web server, thereby transferring the input data to the data processing computer or Web server PC to realize the purpose of the system. do.

The power storage device 142 having the power storage device 144 and the charging device 143 is provided, and is configured to prevent operation of the system even in the case of power failure.

FIG. 4A is a flowchart of a communication program for collecting data of the entire transmission line by short-range wireless communication with one central communication unit 100 as in the exemplary diagram of FIG. 1A.

First, communication signals are classified into two types. A signal for giving a certain command to each slave terminal in the central communication unit 100 is called a command signal, and a report signal for transmitting data of each slave terminal to the central communication signal It is called. Therefore, the command signal causes the communication signal to be transmitted from the slave terminals in the near distance to the slave terminals at the next terminal starting from the central communication unit, and the report signal is directed to the central communication unit starting from the respective slave terminals. will be.

The identification number of the communication terminal is three digits, and the arrangement is to be arranged in a terminal located far away from the terminal of the near position in the central communication unit to be arranged in ascending order from small to large numbers. This identification number assignment system can prevent the howling of the communication signal from the process of passing the command signal from the central communication unit and the report signal of the data from the slave terminals in the field to the central communication unit. It allows the relay transmission of the signal without interference and enables interlacing and multiplexing during the relay transmission of the communication signal.

That is, according to the flowchart of FIG. 1A, the command signal is automatically retransmitted when the number of the terminal previously transmitted is lower than its own number, but stops retransmission when the number of the terminal previously transmitted is higher than its own number. Thus, the command signal unconditionally moves from the lower number terminal to the higher number terminal.

The report signal is automatically retransmitted when the number of the terminal previously transmitted is higher than its own number. However, when the number of the terminal previously transmitted is lower than its own number, the retransmission is stopped. To move from a higher number terminal to a lower number terminal.

In the relay transmission of command signals or report signals, interlacing means a program that shortens the communication time required by jumping beyond one terminal when the communication communication distance reaches two or more terminals. Transmission refers to a program that shortens the communication time by allowing one or more command signals or report signals having a physical distance that does not cause radio interference to one relay transmission communication path to move simultaneously. In this multiplexing, multiple numbers are determined by how much time delay is set according to the number.

The flowchart of FIG. 1A is now described.

When the communication signal is received and input, the same signal is received within 5 seconds immediately before, and the communication signal is retransmitted. This is because when a communication signal moves to retransmission, the same communication signal is received several times from a nearby terminal. If retransmission is performed at that time, it is impossible to move the communication signal using retransmission due to radio interference.

Next, it distinguishes whether it is a command signal or a report signal. In the case of the command signal, after the time delay according to its own terminal number is prepared to transmit its own data, and to relay the command signal to the other terminals to prepare for retransmission by the terminal number system. Even in the case of a report signal, prepare for retransmission by the terminal number system.

In this step, the command signal continues to prepare for automatic retransmission when the number of the terminal previously transmitted is lower than its own number. However, if the number of the terminal previously transmitted is higher than its own number, the command signal stops preparation for retransmission and terminates. do. When the number of the terminal previously transmitted is higher than its own number, the report signal continues to prepare for automatic retransmission, but when the number of the terminal previously transmitted is lower than its own number, it stops preparing for retransmission and ends.

In the next step, if the terminal number is the branch line number and the terminal number sent immediately before is the branch line number, retransmission is performed immediately. If the terminal number sent immediately before is not the branch line terminal number, the terminal is immediately terminated. If the terminal number is not the branch terminal number, the terminal terminates with immediate retransmission by terminal number system and retransmission after time delay. At this time, whether or not the branch terminal number can be recognized by installing and operating a 2-bit dip sw.

FIG. 4B is a flowchart of a communication program for collecting data of the entire transmission line by short-range wireless communication with two central communicators as in the exemplary diagram of FIG. 1B.

Thirty-four transceivers (= terminals) controlled by the central communication unit A (groups) among the fault detection transmitters and receivers of the entire transmission line are referred to as one group, and 26 transceivers controlled by the central communication unit B are referred to as two groups. By dividing the groups in this way, when the transceivers in the 1st group and the 34th transceiver in the 2nd group are different from each other, the signal is unconditionally ignored and terminated so that the communication signal does not occur.

The branching point of the group is divided between the terminal 34 and the terminal 23, in which the group 1 starts transmitting data, one terminal transmits a report signal, and the next terminal transmits a report signal. If the time interval is 3 seconds, it takes 69 seconds to transmit the report signal up to 23 times in the 2 groups, and after that, 34 times in the 1st group transmits the report signal. It can be removed fundamentally.

4C is a flowchart of a communication program for collecting data of the entire transmission line through short-range wireless communication with three central communicators as in the exemplary diagram of FIG. 1C. Twenty-eight transceivers controlled by the central communication unit A are grouped among the fault detection transmitters and receivers of the entire transmission line, and 22 transceivers controlled by the central communication unit B are referred to as two groups, and 10 transceivers controlled by the central communication unit C. Is called 3 groups. By dividing into three groups, the flow chart of the communication program is the simplest. See the flowchart descriptions of FIGS. 4A and 4B for details. Here, in dividing a plurality of slave terminals into several groups, the number of divisions is not limited because it depends on the type of transmission tower path.

The overhead transmission line information collection system of the present invention collects the information of the transmission line to the management computer or Internet Web Server, and utilizes the collected data to accurately determine and display the failure point, It can be searched from PC, PDA, mobile phone, etc., and it can identify the fault span immediately when the transmission line breaks down, thus realizing stable transmission system operation through quick recovery of the transmission line. Therefore, it contributes to high-quality electricity supply by reducing transmission line management manpower and minimizing transmission line outage time, and enables economic and efficient transmission line management.

Claims (2)

In the system for remotely collecting fault information of the overhead transmission line route (Route), As a device installed in each transmission tower, A detection unit (131, 132, 133) for detecting a failure, a wireless communication (hereinafter referred to as short-range wireless communication) module 134 according to the provisions of Radio Law Enforcement Ordinance Article 30 (a radio station which can be established without notification), A CPU 130 for inputting a program for analyzing a signal received from a detection unit to determine whether there is a failure, and a communication relay program for moving a communication signal to a long distance in a near field communication method; Dip Switch (135) which can set its own communication identification number, A failure transmission and reception information collection system comprising a failure detection transmitter and a receiver comprising a power supply consisting of a solar cell (136) and a storage battery (137) for supplying power to the device. In the system for remotely collecting fault information of the overhead transmission line route (Route), Apparatus for installing 1 to 5 within short distance wireless communication range from any point of overhead transmission line path, Short-range wireless communication to communicate with local fault detection receivers Module 141, A communication terminal capable of communicating with the short range wireless communication module 141, a communication terminal for transmitting data collected by the short range wireless communication to a data processing computer, and a communication terminal for communicating with a central group of other groups via wired communication. Using a central communication unit composed of a CPU 140, a built-in communication control program, and a power supply device consisting of a power supply unit 142, a charging unit 143, and a power storage unit 144 for supplying power to the device. Process transmission line fault information collection system, characterized in that.