JPS6341298B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for collecting data on lightning accidents at power transmission towers or the like by remote control.

[Conventional technology]

High-voltage power transmission lines and the steel towers that support them, which transmit power from power plants to power demand areas, are often subject to lightning strikes and other lightning accidents, but it is difficult to determine the date and time of the occurrence and whether the lightning accident was a direct lightning strike or a reverse flash. This is important for maintaining power transmission equipment and improving the technology of its systems. For this purpose, conventionally, a detector is installed at the base of a steel tower to detect the voltage and current during a lightning strike, and the waveform of the detection output of the detector is stored in a digital memory. When it is assumed that a lightning accident has occurred, maintenance personnel patrol the tower and observe the waveform of the detection output stored in the digital memory, and determine whether there has been a lightning strike, whether it was a direct lightning strike, a reverse flash fault, etc. was being determined.
In some cases, the impedance (equivalent to the grounding impedance of the tower) may be determined by hand calculation from the detected voltage and current at the tower foot,
It was also used as data for maintenance of grounding equipment.

[Problem that the invention seeks to solve]

Steel towers for high-voltage power transmission are often installed at high places in mountainous areas that require a great deal of effort to climb, and patrol inspections of such towers have been problematic in that they require a great deal of time, money, and manpower. Further, calculating the grounding impedance by hand is complicated and time consuming, so it has not been put to practical use.

[Means for solving problems]

The tower information collection device according to the present invention detects the voltage and current generated in the tower due to a lightning accident using a detection means at the base of the tower, determines the voltage value, current value, and impedance value, and detects the voltage and current generated in the tower due to a lightning accident. The voltage value, current value, and impedance value detected by the means are stored in a memory, the stored voltage value, current value, and impedance value are transmitted by the means for transmitting radio waves, and the above radio waves are received, and the lightning accident is detected. It is equipped with a means to determine the presence or absence and type of. The data detected by the detection means is stored in a memory, and is transmitted by radio waves based on a predetermined control signal from a remote location, and the radio waves are received to determine the presence or absence and type of a lightning accident at a remote location. It is composed of

[Effect]

Data on voltage, current, and impedance stored in the memory is transmitted via radio waves when a control signal via radio waves is received, and tower information is collected from a distance.

〔Example〕

FIG. 1 and FIG. 2 show the configurations of the transmitting device 2 and receiving device 6 of the tower information gathering device of the present invention. A detection coil 10 of a transmitting device 2 is provided on the tower foot 1 of the steel tower to detect the current flowing through the tower. Further, the tower foot voltage waveform detection line 18 detects the potential generated between the tower foot 1 of the steel tower and the ground 17 several meters away. The transient recorder 11 is a device for recording changes in current and voltage near the tower pedestal based on the detection signal of the detection coil 10 described above, and converts the current waveform at the time of a lightning accident into digital memory 12 after converting it from analog to digital. Make me remember. When the receiver 15 receives the control signal, the transmitter control unit 13 transmits the data to the digital memory 1.
The transmitter 14 is controlled so that the data stored in the transmitter 2 is transmitted by the transmitter 14 and the antenna 3.
As shown in FIG. 3, the receiving device 6 is mounted on a moving body such as a vehicle and can be moved to any desired location. Receiver control unit 22 of receiving device 6
transmits a signal for controlling the transmitter control unit 13 of the transmitting device 2 using the transmitter 25 and antenna 26. Receiver 21 receives, through its antenna 20, the data transmitted by transmitter 14 and stores it in memory 23. The waveform analysis/discrimination device 24 analyzes the waveform based on the data in the memory 23 and displays it on the display unit 27 together with the voltage and current values included in the data.

Next, the operation will be explained. A plurality of steel towers 1 supporting power transmission lines are usually installed at predetermined intervals, and as shown in Fig. 3, for example, three steel towers 1 are installed.
A, 1B, 1C have transmitting devices 2A, 2, respectively.
B and 2C are explained. These steel towers 1A,
1B and 1C are installed at high places such as mountain tops and ridges, and the power source for operating the transmitter is composed of, for example, a primary battery or storage battery and a solar battery. The transmitter 2 is always in operation, and when a lightning accident occurs, its data is automatically stored in the digital memory 12. A vehicle 5 loaded with a receiving device 6 is running or stopping on a road at the foot of the towers 1A, 1B, and 1C where they can be seen. When the transmitter 25 transmits a wireless signal for collecting data stored in the digital memory 12 of the transmitter 2 by operating the receiver control unit 22 of the receiver 6 shown in FIG. It is received by the receiver 15 of the transmitter 2 and transmitted to the transmitter controller 1.
3 and stored in the digital memory 12 is transmitted by the transmitter 14 as a radio wave signal. The transmitter 25 of the receiving device 6 is configured to be able to select one of the plurality of transmitting devices 2A, 2B, and 2C.For example, the transmitter 25 of the receiving device 6 can select one of the plurality of transmitting devices 2A, 2B, and 2C. This modulates the signal. The signal transmitted by the transmitter 14 is received by the receiver 21 of the receiving device 6, passes through the receiver controller 22, and is sent to the memory 23.
is memorized. The waveform analysis/discrimination device 24 reads the data from the memory 23 and performs D/A conversion, and the fourth
Based on the waveform shown as an example in the figure, the type of the received signal waveform, such as whether it is caused by a direct lightning strike or a reverse flash fault, is determined and displayed on the display section 27. At the same time, the voltage and current values generated in the tower 1 during a lightning accident, and the grounding impedance value of the tower, which is calculated by performing calculations based on these values, can also be displayed on the display section 27. Grounding impedance is closely related to preventing lightning damage to power transmission and distribution lines, and if the grounding impedance is large, lightning accidents may occur due to lightning strikes. According to the present invention, the temporal change in the value of grounding impedance during an actual lightning strike can be determined from voltage and current calculations, thereby making it possible to judge whether the tower is grounded or not, and providing data for maintenance. At the same time, if necessary, a time-varying curve of impedance can be plotted to obtain data for grounding research and technical improvement. In the above embodiment, three steel towers 1 are shown as an example, but of course this is not limited to three, and information can be collected from more steel towers by one vehicle carrying the receiving device 6.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily and quickly collect electrical data from steel towers installed in high places in mountains by remote control, and also to collect electrical data from a large number of steel towers in a short time. Since it can be collected sequentially, it has a great effect on reducing the number of personnel. Another effect is that by determining the grounding impedance of the pylon from the current and voltage near the tower pedestal, it is possible to know whether the pylon is grounded properly.

[Brief explanation of drawings]

Figures 1 and 2 are block diagrams of the transmitter and receiver of the tower information collection system of the present invention, Figure 3 is a diagram showing the arrangement of towers, and Figure 4 is an example of a voltage waveform diagram caused by a lightning accident. be. 1: Steel tower, 2: Transmitting device, 5: Vehicle, 6: Receiving device, 10: Detection coil, 11: Transient recorder, 12: Digital memory, 13: Transmitter control unit, 14: Transmitter, 21: Receiver , 22: Receiver control unit.

Claims (1)

[Scope of Claims] 1. Detection means for detecting the voltage and current generated in the tower due to a lightning accident at the base of the tower, and obtaining the voltage value, current value, and impedance value; the voltage detected by the detection means; a memory for storing values of voltage, current, and impedance; means for transmitting the stored voltage, current, and impedance values by radio waves based on predetermined control signals from a remote location; and means for receiving the radio waves and detecting lightning accidents. A steel tower information gathering device equipped with means for determining the presence or absence and type of steel towers. 2. The tower information collection device according to claim 1, wherein the means for transmitting by radio waves includes means for starting transmission according to a wireless signal from the outside. 3. The tower information collection device according to claim 1, wherein the means for receiving radio waves comprises means for selectively receiving signals from a plurality of transmitting means. 4. The steel tower information gathering device according to claim 1, wherein means for receiving radio waves and determining the presence or absence and type of a lightning accident is mounted on a moving body.