JPH0738010B2 - Flash display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash-on display device for specifying an accident point when a ground fault occurs on a power transmission line.

[0002]

2. Description of the Related Art When a ground fault occurs in a power transmission line, an electric power company conducts an accident point search and a specific work in order to investigate the cause of the accident and to confirm the presence or absence of a facility abnormality. As a part of this work, a fault locator and a gunpowder type flashover display device have been used to improve work efficiency.

The fault locator is attached to the end of the power transmission line and injects a pulse into the power transmission line when a ground fault occurs in the power transmission line. The pulse travels along the transmission line, is reflected at the ground fault point, and returns to the incident end again. This reflected wave is used to identify the reflection point. This device has enabled early detection of accident points.

Further, the explosive flashing indicator is installed in each tower, and a lightning current due to a lightning strike flows through the tower member, and an induction current due to the current is amplified by a coil. A filament is attached to the end of this coil to generate heat, and this heat causes the explosive to ignite and explode. The flashing is displayed by blowing the lid of the indicator and the red display cloth to the outside with this blast and hanging it. This device also enabled early identification of accident points.

[0005]

However, since the fault locator has low position detection accuracy, it is impossible to specify an accident point in a narrow range, and a wide range must be patroled for specifying an accident point. In addition, there are problems that it cannot be used in principle for the recent multi-branch transmission line, that the device is expensive, and it is difficult to apply it for expansion.

Further, since the explosive-type flash-on indicator uses explosives, the life of the device is controlled by the life of explosives.
The service life is short (about 5 years). In addition, there is a problem once the operation will be the re-use requires replacement of the display device can not be economic efficiency, etc., bad weather or when the viewer, such as at night or rainy weather for due to the visual confirmation is visually in such case and helicopters of myopia In this case, there are problems that it is difficult to visually check, and that the ascending tower work is required to replace the flashing indicator, which is complicated.

The present invention has a long service life and is not limited in the number of times of use, and can identify a ground fault point when a worker gets into a helicopter or the like and can quickly identify the ground fault point regardless of the worker's skill or bad weather. An object is to provide a possible flash display device.

[0008] subject matter of the present invention for solving the above problems, a detection unit you detect lightning current through the tower transmission line,
When the lightning current is detected by the detection unit, a holding unit that stores the fact that the lightning current has been detected and a different electric power for each tower.
Wave signal is emitted for a certain period of time and then automatically reset to reduce lightning current.
Detection / transmission device having transmission section for returning to detection state
A mobile radio receiver that receives the radio signal is provided for each tower.
And the reception unit, if there was the reception.
Depending on the kind of the signal, it was provided in any of the towers
Judgment unit for judging whether the lightning signal is detected by the detection unit
And the fact that there was a flashover due to the received signal and the judgment
Shows whether the lightning current is detected in any of the towers.
And a reception display device having a display unit shown in FIG.

Further, the reception display device is configured to receive the radio signal.
Holds that the lightning current was detected after receiving
And a detection unit for transmitting a reset instruction signal
The transmitter receives the reset instruction signal and stores it in the storage unit.
The above flashing display device having a receiving unit for resetting is also a gist.

[0010]

[0011]

[Operation] When a ground fault occurs on a power transmission line or a steel tower, a flashover occurs and a lightning current flows through the power transmission line to the steel tower. The detection unit detects this lightning current, and the transmission unit emits a radio signal indicating that the lightning current has been detected. The receiving unit receives such a signal. The display unit displays the fact that there is a flashover by the received signal.

In the flashover display device described above, in which the signal emitted by the transmitting unit is a radio signal different for each tower and the determining unit is provided, the detecting unit detects the lightning current and the transmitting unit detects the lightning current. It emits a radio signal indicating that it has been detected. This signal is a radio signal that differs for each tower, and the radio signal is received by the receiving unit. The determination unit determines which of the steel towers detects the lightning current by the type of the received signal. The display unit displays the fact that there is a flashover by the received signal and the judgment, and in which tower the lightning current is detected.

In the case where the flashover display device has the above-mentioned structure for each arm supporting the transmission line of each of the steel towers, the detecting section for detecting the lightning current flowing through the arm is first detected. The unit detects a lightning current flowing through the arm of the tower, and the transmitting unit emits a radio signal indicating that the transmitting unit has detected the lightning current.
Such a signal is a radio wave signal that differs for each arm provided with the detector, and the receiver receives this signal. The determining unit determines which of the arm units of each tower detects the lightning current based on the type of the radio signal received by the receiving unit. The display unit displays the fact that there is a flashover by this received signal and the judgment, and which arm of which tower the lightning current was detected.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams illustrating a flash display device according to an embodiment of the present invention. A flash display device according to an embodiment of the present invention includes a detection / transmission device and a reception / display device. FIG. 1 is a circuit diagram showing a schematic configuration of a detection / transmission device and a reception / display device. Referring to FIG. 1, the detection / transmission device 1 includes a detection unit 10, a transmission unit 11, and a power supply unit 13. The detection unit 10 includes a sensor, a comparator and the like.

The detection / transmission device 1 is installed for each steel tower of the power transmission line. Although FIG. 2 shows the steel tower 3 of the power transmission line, in the detection / transmission device 1, the sensor of the detection unit 10 is provided on the tower leg 301 of the steel tower 3. When a lightning strike occurs in the steel tower 3 and the power transmission line 302, a lightning current flows through the steel tower 3 and flows into the tower leg 301 of the steel tower 3. The sensor of the detection unit 10 detects a lightning current flowing through the tower leg 301.

Referring to FIG. 1, the sensor of the detecting section 10 can use a known means such as a winding wire or a shunt resistor.
In this embodiment, the winding 100 is used. When a lightning current flows through the tower leg 301 in the direction of arrow 305 due to a lightning strike, a magnetic flux is generated around the tower leg 301. When this magnetic flux intersects with the winding 100, a current flows through the winding 100 in the direction of arrow 101. Is induced. Comparator 102 determines whether the current induced in winding 100 is due to a lightning current. That is, since a relatively small current that is not due to a lightning current may flow through the tower pedestal 301, it is determined that the comparator 102 has induced a current of a certain magnitude or more as compared with a reference voltage of a predetermined magnitude. Sometimes as the detection of lightning current,
The signal is sent to the holding circuit 111 and the timer 112 of the transmitter 11. The resistor 104 has a function of converting a current flowing through the winding 100 into a voltage, and the resistor 105 is a generator of the reference voltage. Reference numeral 103 is an arrester for protecting the comparator 102 and the like from over-electricity.

The transmitter 11 includes a holding circuit 111 and a timer 11.
2. The transmitter 113 is provided. The holding circuit 111 has a function of holding the signal from the comparator 102. The holding circuit 111 includes, for example, a flip-flop and constitutes a holding circuit by a known means. When the above signal is received, the flip-flop of the holding circuit 111 is set, so that the holding circuit 111 causes the transmitter 113 to set.
Is sent to. The transmitter 113 is, for example, a transmitter circuit,
A modulation circuit, a transmission circuit, and the like are provided to receive the above-mentioned signal from the holding circuit 111 and emit weak radio waves omnidirectionally by known means. This weak radio wave is set to a different frequency for each tower by the modulation circuit of the transmitter 113.

The weak radio wave transmitted from the transmitter 113 is received by the reception / display device. Referring to FIG. 1, the reception / display device 2 includes a receiver 20, a signal determination device 21, and a flashing display device 22. The receiver 20 is provided by known means.
Weak radio waves from the transmitter 113 are received. Signal judge 2
1 is equipped with, for example, a decoder and determines which of the towers 3 has detected the lightning current by the frequency of the weak radio wave received by a known means, and the flashing indicator 22 receives this. Then, the fact that a flashover has occurred by a known means and in which tower 3 the lightning current has been detected are displayed. The flashover indicator 22 is provided with, for example, a plurality of lamps corresponding to the respective towers 3, and the corresponding lamp is turned on by the above-mentioned determination as to which sensor in the tower 3 the lightning current has been detected. As for the configuration, it is configured so that you can instantly know which steel tower the flashover is related to.

The flip-flop of the holding circuit 111 is reset by the timer 112 after a lapse of a fixed time after being set. In addition, a weak radio wave is transmitted by the transmitter 23 of the reception / display device 2, received by the receiver 12 of the detection / transmission device 1, and operated from the reception / display device 2 side by a known means to operate the holding circuit 111. You can also reset the flip-flop. Further, by transmitting a signal constantly or at regular intervals by a transmitter (not shown), when there is a failure in the detection / transmission device 1, a failure indicator 25 of the reception / display device 2 displays that fact to detect and It is also possible to inspect a failure of the transmission device 1.

The power supply unit 13 is provided in the detection / transmission apparatus 1 and supplies power to the comparator 102, the holding circuit 111, the transmitter 113, and the receiver 12. The power supply unit 13
A solar cell 131 is provided in the power supply unit 13 to compensate for power consumption of the battery 132 of the power supply unit 13. It is also possible to provide a small wind turbine generator or the like on the steel tower 3 to compensate for the consumption of electric power of the battery 132. In addition, the power supply unit 24 is the reception / display device 2.
The receiver 20, the signal determiner 21, the flashing indicator 22, and the transmitter 23 are supplied with electric power, and are equipped with a battery 241.

It is also possible to provide a plurality of sensors on one steel tower 3 so that the flashover aspect can be known more concretely. That is, referring to FIG. 2, the steel tower 3 has an arm portion 304 that supports the power transmission line via the insulator 303, but the detection / transmission device 1 is provided for each such arm portion 304. Accordingly, each sensor of the detection / transmission device 1 is configured to detect the lightning current flowing through the arm 304 for each arm 304. In response to the detection of the lightning current detected for each arm 304, the transmitter 113 of each detection / transmission device 1 processes the signal from the holding circuit 111 and emits a weak radio wave as a different signal for each arm 304. . That is, the weak radio wave emitted from the transmitter 113 is intermittently processed, and is processed by changing the number of pulses or the pulse interval. This can be performed by a known means, for example, by providing the transmitter 113 with an intermittent switch when it is intermittent. In this way, the weak radio waves having different signals for each arm 304 are received by the receiver 20, and
1 determines by a known means not only in which tower 3 the lightning current was detected, but also in which arm 304 of the tower 3 the lightning current was detected. Not only is it detected by the steel tower 3 of No. 1, but also which arm 304 of the steel tower 3 is detected.

Next, a method for using the flash display device of this embodiment will be described. The detection / transmission device 1 of this embodiment is installed as described above. The reception / display device 2 is carried by an operator, and is boarded on, for example, a helicopter to patrol a power distribution network distributed over a wide area from above. When approaching the point where the flashover occurred, the weak radio wave from the transmitter 113 of the tower 3 related to the flashover can be received by the reception / display device 2, and the flash tower 22 displays the tower 3 related to the flashover. It In the case of the above-described configuration in which the detection / transmission device 1 is provided for each arm 304 of the steel tower 3, which of the transmission lines 3 is involved in the flashover
Even 02 is displayed. After that, the accident point may be specified according to the information on the flashing indicator 22.

According to the flashover display device according to the present embodiment described above, if the holding circuit 111 is reset by the timer 112 or the receiver 12 and the transmitter 23 without using gunpowder, it can be used any number of times. Since the power consumption of the power source 13 can be replenished and saved by the battery 131 and the reset, the flash display device having a long useful life and an unlimited number of uses can be provided.

Further, since the frequency of the weak radio wave can be changed corresponding to each steel tower 3, the steel tower 3 involved in the flashover can be specified,
Unlike the fault locator, it is not necessary to make a patrol for identifying the accident point in a wide range, and it is possible to provide a flashing display device that can be used for a multi-branch transmission line.

Moreover, since it is possible to grasp the fact that there is a ground fault accident and to identify the steel tower 3 involved in the flashover, regardless of the weather and the ability of the worker, without using visual confirmation like the explosive flashing display. Therefore, it is possible to easily grasp the fact that the ground fault has occurred and to identify the steel tower 3 involved in the flashover.

Further, detection is made for each arm 304 of the steel tower 3.
When the transmitter 1 is provided, the flashing indicator 22 indicates not only in which tower 3 the lightning current was detected, but also in the tower 3
It is also possible to display which of the arm portions 304 has been detected, so that the task of identifying the accident point is further facilitated.

[0027]

According to the flash display device according to the present invention described above, since the explosive is not used, it is possible to provide a flash display device having a long service life and an unlimited number of uses.

Further, in the flashover display device having the determination unit, since it is possible to display in which display tower the lightning current is detected, the steel tower involved in the flashover can be easily specified, and the fault can be identified. Unlike the locator, it is not necessary to make a patrol for identifying the accident point in a wide range, and it is possible to provide a flashover display device that can be used for a multi-branch transmission line.

Moreover, since it is possible to grasp the fact that there was a ground fault accident and to identify the steel tower involved in the flashover, regardless of the weather and the ability of the operator, without using visual confirmation like the explosive flashing indicator. It is possible to easily grasp the fact that there was a ground fault and identify the steel tower involved in the flashover.

Further, in the case of the above-mentioned structure, the flashover display device is provided with a detecting portion for detecting each of the lightning currents flowing through the arm portions for supporting the power transmission line of each of the steel towers. Since the section can display not only in which tower the lightning current was detected, but also in which arm of the tower the lightning current was detected, the task of identifying the accident point becomes easier.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a schematic configuration of a flash display device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a mounting position of a sensor of the flash display device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Detection / Transmission Device 100 Winding 102 Comparator 111 Holding Circuit 113 Oscillator 2 Reception / Display Device 20 Receiver 21 Signal Judgment Device 22 Flashing Indicator 301 301 Tower Tower

Claims (2)

[Claims] 1. A you detect the lightning current through the tower transmission line
A detection unit, a holding unit for storing a fact that has been detected該雷current when there is detection of the lightning current according to the detection section, each tower
Automatically emits different radio signals for a certain period of time and then automatically resets
And a transmitter that returns to the state of detecting lightning current.
A transmission / reception device is provided for each steel tower to receive the radio signal.
Mobile radio reception unit and the reception unit when the reception is made
Depending on the type of signal received by any of the towers
Determine whether the lightning signal is detected with the detection unit provided
And the received signal and the determination result in a flashover.
And the lightning current was detected in any of the towers
A flash display device , comprising: a reception display device having a display unit that displays whether or not the display is high. 2. The reception display device receives the radio signal.
After that, the holding unit that stores the fact that the lightning current was detected is
The detection / transmission device includes a transmission unit that emits a set instruction signal.
The device receives the reset instruction signal and resets the memory of the holding unit.
2. A receiving unit for setting up is provided.
Flashover display device.