JPS62232808A - Arrestor insulator with operation sensor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used for power transmission and distribution lines to not only protect them from lightning strikes, but also to inform monitoring stations, etc. of their operating status and deterioration status. This invention relates to a lightning arrester with an operation sensor that can perform

(Prior art) Lightning arrester insulators with a built-in lightning arrester that acts as a conductor against steep voltages are effective in preventing damage to the insulators by allowing snow current to escape to the ground side even when lightning strikes power transmission and distribution lines. Therefore, it is expected to be widely used in the future. However, in the past, there was almost no way to notify the presence of a hole in a lightning arrester, and the only known method was to use the force of an explosive to cause pieces of cloth to hang down in the event of a lightning strike. Moreover, the lightning protection elements built into lightning protection insulators are susceptible to deterioration due to lightning strikes and over time, so line maintenance workers constantly inspect lightning protection insulators on power transmission and distribution lines scattered over a wide area to identify deteriorated or broken ones. There is a problem in that it has to be replaced, which requires a great deal of effort.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems and detects the snow current that flows through the lightning arrester during a lightning strike, and the follow-on current that flows through the lightning arrester when it malfunctions or deteriorates. This was completed with the aim of creating an M78 insulator with an operation sensor that could notify monitoring stations of the operating status of the lightning arrester.

(Means for Solving the Problems) The present invention provides a grounding electrode on the outer periphery of a conductor that connects a grounding electrode of an insulator body with a built-in lightning arrester element in the center and a mounting bracket for attaching this insulator body to a steel tower arm or the like. A search coil that detects the current flowing through the conductor is wound around the conductor, and an optical shutter element that is activated when current flows through the search coil is connected to the search coil, and an optical fiber for light projection is connected across the optical shutter element. It is characterized in that a cable and an optical fiber cable for light reception are attached.

(Example) Next, the present invention will be explained in detail with reference to the illustrated embodiment.
In Fig. 1, Fil is the insulator body, (2) is the ZnO lightning arrester built into its center, and (3) is the upper part supported by the insulating part (4), and the lower part is the lightning arrester (2).
), (5) is the flange of the insulator body +11, (6) is the mounting bracket that uses this flange (5) to attach the insulator body +11 to the tower arm, etc., (7) is the arc horn. be. In addition, (8) has a ground electrode (3
) with a nut (9), the base end is fixed to the mounting bracket (6) with a bolt θω, and the conductor connects the ground electrode (3) to the mounting bracket (6), and the large diameter part in the center A search coil (11) for detecting the current flowing through the conductor (8) is wound around the outer circumference of the conductor (8) multiple times. As shown in Figure 2, this search coil (11) has a load resistance (1
2) are connected in series and parallel, as well as a surge absorber (13) and a Zener diode (14) for overvoltage protection.
are connected in parallel, and an optical shutter element (16) is also connected via a rectifier circuit (15). As the optical shutter element (16), a device such as a liquid crystal that has the ability to block light when a current is applied is used, and the rectifier circuit (15) connects the search coil (11) in either the forward or reverse direction. This is for rectifying the current so that the optical shutter element (16) can be operated even when the current flows. (17) and (18) are optical fiber cables for transmitting and receiving light that are attached across the optical shank element (16), and (19) and (20) are prisms, which are shown in Figure 3. As shown, a light emitting element (21) such as an LED or LD is connected to the tip of the optical fiber cable (17) for projecting light, and a light receiving element (22) is connected to the tip of the optical fiber cable (18) for receiving light. is connected. Therefore, normally, the light beam passing through the optical fiber cable (17) for light emission passes through the optical shutter element (1G), enters the optical fiber cable (18) for light reception, and then goes through the light receiving element (2).
2), when the search coil (11) detects that a lightning current or a follow-on current has flowed through the conductor (8), the light shutter element (16) closes, so the light receiving element (
22), the light no longer reaches. The operation of the optical shutter element (16) is converted into an electrical signal by the light receiving element (22). As shown in Figure 3, the light receiving element (22) also has a discriminator (23) that determines whether the electrical signal is due to lightning current or a follow-on current due to deterioration of the lightning arrester, and a counter for the number of activations. (24), a display device (25), a transmitter (26) for transmitting with an address, and an E10 for converting the electrical signal back into an optical signal.
A converter (27) etc. are connected. In this embodiment, the ha search coil (11) and the sensor circuit portion directly connected thereto are housed inside the box (28), but it goes without saying that various modifications can be made to the form.

(Function) In the lightning arrester with an operation sensor of the present invention configured as described above, the lightning arrester (2) built into the insulator body (1) acts as a conductor to reduce the lightning current against a sudden voltage during a lightning strike. It is the same as the conventional method that the power is released to the ground side through the ground electrode (3), the conductor (8), and the mounting bracket (6) to protect the power transmission and distribution line. However, in the lightning arrester of the present invention, the search coil (11) is wound around the outer periphery of the conductor (8), and the optical shielding element (16) is connected to the search coil (11). When the lightning arrester operates and lightning current flows through the conductor (8), the optical shutter element (16) closes and the optical fiber cable (17) for light projection is closed.
The light-receiving optical fiber cable (18) is optically blocked, and no light enters the light-receiving element (22). Furthermore, if the lightning arrester (2) fails or deteriorates, not only the lightning current but also a ground current called a follow-on current will flow from the grounding electrode (3) to the conductor (8). The follow-on current also activates the optical shutter element (16) to prevent light from entering the light receiving element (22). Such a change in the light receiving state is converted into an electrical signal by the light receiving element (22), and then judged by the discriminator (23) as described above as to whether the light is emitted by lightning current or not, and then transmitted by the transmitter (26). Each lightning insulator is assigned an address and an E10 converter (27
) is converted into an optical signal again and transmitted to a monitoring station or the like via an overhead ground-wire optical fiber cable (29). The discriminator (23) takes advantage of the fact that the lightning current is a single direct current and the follow-on current is a commercial frequency alternating current, as shown in Figure 4, and performs full-wave rectification and waveform shaping. The waveform is used to distinguish between a lightning current and a follow-on current, and also sends a signal to a counter (24) for the number of operations and a display (25).

(Effects of the Invention) As is clear from the above description, the present invention includes winding a search coil for detecting the current flowing through the conductor around the outer periphery of four bodies connecting between the ground electrode and the mounting bracket, and wrapping the search coil around the outer circumference of the four bodies that connect the ground electrode and the mounting bracket. Since the optical shafter elements are stacked horizontally, the S current that flows to the ground electrode through the lightning arrester during a lightning strike, and the follow-on current that flows to the ground electrode when the lightning arrester deteriorates or breaks down, can be easily interpreted as changes in the on/off state of the light beam. It is something that can be detected. Therefore, it is now possible to centrally monitor the operating status and deterioration status of lightning protection insulators, which conventionally required track maintenance workers to inspect by going around, at the monitoring station, greatly reducing the labor required for track maintenance work. be able to. In addition, in the present invention, a search coil with an optical shutter is used to detect lightning current and follow-on current, so the structure of the sensor part is simple, there is little risk of failure, and assembly and adjustment are easy. Furthermore, since an optical fiber is used in the signal transmission section, there is almost no influence from electromagnetic induction or electrostatic induction, and accurate accuracy can be maintained over a long period of time. Therefore, the present invention eliminates the problems of the conventional lightning arrester and greatly contributes to the development of industry.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a circuit diagram of the main part thereof, Fig. 3 is a block diagram showing a light emitting/receiving section connected to an optical fiber cable, and Fig. 4 1 is a block diagram showing the operation of a discriminator between lightning current and follow-on current; FIG. (■): Insulator body, (2): Lightning arrester, (3): Ground electrode, (6): Mounting bracket, (81: i body, (II):
Search coil, (16): Optical shutter element, (17)
: Optical fiber cable for light emission, (18) : Optical fiber cable for light reception.

Claims (1)

[Claims] A conductor (3) that connects the grounding electrode (3) of the insulator body (1) with a built-in lightning arrester (2) in the center and the mounting bracket (6) for attaching this insulator body (1) to a steel tower arm, etc. 8)
A search coil (11) for detecting the current flowing through the conductor (8) is wound around the outer circumference of the conductor (8), and the search coil (11) has an optical shutter element (16) that is activated when current flows through the search coil (11). At the same time, an optical fiber cable (17) for light projection is connected across the optical shutter element (16).
) and a light receiving optical fiber cable (18) are attached.