JPH04121035A - Accident point spotting device - Google Patents

Abstract

PURPOSE:To accurately spot an accident point merely by using a single optical fiber by disposing many accident detectors each having a flashover sensor, a position code generator to be operated by the detection signal of the sensor and an optical waveguide type switch at many positions of a power transmission facility, and connecting the detectors in series by optical fiber. CONSTITUTION:When a flashover sensor 5 generates a flashover detection signal, a position code generator 6 is operated to generated a position code (ID code) of an accident detector 1. A position code signal thus generated is code-modulated, and introduced to an optical waveguide type switch 7 through a suitable output buffer. Since the detectors 1 are connected in series therebetween by an optical fiber 2, all the signals generated from any detector 1 are all transmitted through one fiber 2. Further, the position code signal contained in an optical signal received by an accident position discriminator 18 in an accident detection board 3 provided at the end of the fiber 3 is analyzed, and which of the detectors 1 detects a flashover accident is discriminated.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a method for detecting the location of a flash fault in power transmission and distribution equipment such as a substation or power transmission line by using optical signals to identify the location of the fault. This invention relates to an accident point locating device that can be used to locate an accident point immediately at a monitoring station installed within the plant or at a remote location.

(Prior art) An accident point locating device that can transmit the location of the accident point to a monitoring station using optical signals when a flashover accident occurs is disclosed in, for example, Japanese Patent Laid-Open No. 60,40967. Already known as shown. This conventional equipment involves stretching two round trip optical fibers between each tower of a power transmission line, sending a pulse signal from one end on the outbound side at a monitoring station, and the time it takes for the pulse signal to return from the return side. At the tower where the accident occurred, the pulse signal is returned via a bypass, and the accident point is determined based on the time difference.

However, in this case, it is necessary to install two round trip optical fibers and a bypass optical fiber between each tower, resulting in high equipment costs and problems such as it is not easy to accurately locate the accident point. was there.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems, and when a flash fault occurs in power transmission and distribution equipment, it is possible to eliminate the problem by simply using a single optical fiber. This was completed to provide an accident point locating device that can accurately locate the accident point.

(Means for solving the problem) The above problem is to install fault detectors consisting of a flash fault sensor, a position code generator operated by the flash fault detection signal, and an optical waveguide switch at multiple locations in power transmission and distribution equipment. The accident point locating system is characterized in that each of these accident detectors is connected in series with an optical fiber, and an optical signal transmitter, a receiver, and an accident position discriminator are installed at the terminals thereof. This can be achieved by a device.

Next, the present invention will be explained in more detail with reference to illustrated embodiments.

(Example) Fig. 1 schematically shows the overall configuration of the fault point locating device of the present invention. (2) is a single optical fiber connecting each of these accident detectors (1) in series, (3) is the terminal of this optical fiber (2) This is a failure detection panel installed in the department.
This failure detection panel (3) is usually installed at a monitoring station or the like.

As shown in FIG. 6, which will be described in detail later, the accident detector (1) of the present invention consists of a flashover sensor (5), a position code generator (6), and an optical waveguide switch (7). It is.

FIG. 2 is a diagram showing an example of the configuration of the flashlight sensor (5). In this example, the flashlight sensor (5) is an ultraviolet sensor ( 4) and
An acoustic sensor (8) that detects flashing noise, and a discriminator (9) that determines the presence or absence of flashing by a combination of these two types of signals.
). This ultraviolet sensor (4) has, for example, spectral sensitivity characteristics as shown in FIG. 3, and can reliably detect flashlight. However, there is a risk of malfunction due to ultraviolet rays in sunlight, so a duration detector 0ω is combined as shown in Figure 2 to distinguish between instantaneous flashlight and continuous sunlight. At this time, an instantaneous sound is generated along with the flash of light, so this is detected by the acoustic sensor (8), and also distinguished from other sounds by the duration detector OD, and the momentary sound and the flash of light are detected. Only when they occur simultaneously, the discriminator (9) generates a flash detection signal.

Figure 4 shows the above flash fault sensor (5) connected to switch 02 of the substation.
This is an example in which the switch 021 is installed directly above the switch 021, and is used to detect which switch 021 the flash fault has occurred. However, it goes without saying that such a flash fault sensor (5) can also be attached to each tower of the power transmission line.

The flash sensor (5) described above is composed of an ultraviolet sensor (4) and an acoustic sensor (8) that detects flash noise, but as shown in Figure 5, the flash sensor (5) It may also be made up of a CT type current sensor 0■ that detects 'is' and a discriminator side that determines the presence or absence of a flash fault based on the magnitude and waveform of the current. This type of CT type current sensor 0
This is installed on a steel tower, etc. where fault current flows, and directly detects fault current electrically.

As shown in FIG. 6, in the present invention, when the flash fault sensor (5) issues a flash fault detection signal in this way, the position code generator 04) operates to detect the fault detector (]). Generates a position code (ID code). This location code is used to display the fault point as a digital signal. For example, in the case of a substation, it indicates in which switch the fault occurred, as a numerical value, and in the case of a power transmission line, it indicates in which tower the fault occurred. Displays whether the occurrence occurred using the tower number. This position code signal is code-modulated as shown in FIG. 6, and guided to the optical waveguide switch (7) via a suitable output buffer.

Although there are various types of optical waveguide type switches (7), a Matsuhatsu Ender type waveguide is used in this embodiment.

This is done by changing the optical path length of one of the input lights branched on the LiNb0z substrate (15) by applying a voltage to the electrode 0ω on the substrate to shift the phase, and then rejoining the branched input light. This type of signal changes the intensity of the output light by using the phase shift, and the output light changes as shown in Figure 7, allowing the position code signal to be transmitted as an optical signal. It becomes possible. Use of such a leading wavepath type switch (7) enables signal transmission with less loss. As mentioned above, each accident detector (1) is connected in series with the optical fiber (2), so all the signals generated from any accident detector (1) are transmitted through one optical fiber. (2).

As shown in Fig. 1, inside the failure detection panel (3) installed at the end of this optical fiber (2), there are an optical signal transmitter 00, receiver 07) and an accident position discriminator side. is set up. The transmitter 00 is for transmitting input light to the optical fiber (2) using a laser diode, and the receiver 07) is for receiving the position code signal transmitted through the optical fiber (2). It is something. Furthermore, the accident location discriminator 0 mark analyzes the position code signal included in the received optical signal and determines which accident detector (]) detected the flash accident, thereby locating the accident point. do.

(Function) The accident point locating device of the present invention configured as described above allows the flash fault sensor (5) of one of the fault detectors (1) placed at multiple positions on the power transmission and distribution equipment to detect a flash fault accident. When detected, the position code generator (6) is operated by the flash fault detection signal to generate a position code corresponding to the accident detector (1) where the flash fault was detected, and this is transmitted by the optical waveguide switch (7). Modulated into an optical signal. This optical signal is transmitted through a single optical fiber (1) connected in series between each accident detector (1).
2), and is analyzed by a receiver 07) and an accident position discriminator 08) provided at the end of the optical fiber (2) to locate the accident point.

(Effects of the Invention) As explained above, according to the accident point locating device of the present invention, the position code generator generates the position code of the accident point in response to the flash fault detection signal using the optical waveguide type switch 7 ), which is modulated into an optical signal and transmitted as an optical signal, a single optical fiber (2) is connected to each accident detector (1
), (1) It is possible to detect all accident points by simply placing them between them. Therefore, unlike the conventional method, two optical fibers are not required, and equipment costs can be reduced.

Furthermore, by using the optical waveguide switch (7), signal transmission loss can be reduced. Further, according to the present invention, the digital position code of the accident point can be notified to a monitoring station, etc., so that the accident point can be accurately located.

Therefore, the present invention greatly contributes to the development of industry as an accident point locating device that solves the problems of the conventional technology.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the overall configuration of the accident point locating device of the present invention, FIG. 2 is a block diagram showing the configuration of the flash sensor of the embodiment, FIG. 3 is a spectral sensitivity characteristic diagram of the ultraviolet sensor, and FIG.
The figure is a front view showing the installation situation of the flash sensor of the embodiment, the fifth part is a block diagram showing the configuration of the flash sensor of another embodiment, and the sixth part is a position code generator and optical waveguide type switch. FIG. 7 is a waveform diagram showing an example of an optical signal modulated by the optical waveguide type switch 7. (1) Two accident detectors, (2): Optical fiber, (4): Ultraviolet sensor, (5): Flash sensor, (6): Position code generator, (8): Acoustic sensor, (9) Two Discriminator, 0■;
CT type lightning current sensor 04): Discriminator, (16): Transmitter, 07): Receiver, θ: Accident position discriminator.

Claims (1)

[Claims] 1. An accident detector (1) consisting of a flash sensor (5), a position code generator (6) operated by the flash detection signal, and an optical waveguide switch (7). Each of these fault detectors (1) is installed at multiple locations in the power transmission and distribution equipment.
The accident points are connected in series by optical fibers (2), and an optical signal transmitter (16), a receiver (17), and an accident position discriminator (18) are installed at the terminals of the optical fibers (2). Locating equipment. 2. The flash sensor (5) includes an ultraviolet sensor (4) that detects ultraviolet rays from flash light and an acoustic sensor (8) that detects flash sound.
) and a discriminator (9) for determining the presence or absence of a flash fault based on a combination of these two types of signals. 3. The flash fault sensor (5) is composed of a CT type current sensor (13) that detects a fault current, and a discriminator (14) that determines the presence or absence of a flash fault based on the magnitude and waveform of the current. An accident point locating device according to claim 1.