JPS62232807A - 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

(Conventional technology) Lightning arrester insulators have a built-in lightning arrester that acts as a conductor against steep voltages, and even if lightning strikes a power transmission/distribution line, the lightning current escapes to the ground side, preventing damage to the insulator, etc. Because of its effectiveness, it is expected to be widely used in the future. However, in the past, there was almost no way to notify the lightning arrester that snow had fallen, and the only known method was to use the force of an explosive to cause pieces of cloth to hang down when lightning strikes. Moreover, the lightning arrester elements built into the lightning arrester are susceptible to deterioration due to lightning strikes and other factors over time, so track maintenance workers constantly inspect the lightning arresters on the transmission TL lines that are scattered over a wide area to identify deteriorated or malfunctioning insulators. The problem is that it requires a great deal of effort.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems by detecting the lightning 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 a lightning arrester 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 an outer periphery of a conductor that connects a ground 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, etc. A search coil that detects the current flowing through the conductor is wound around the conductor, and a light emitting element that converts the current flowing through the search coil into an optical signal is connected to the search coil, and this optical signal is sent to a detector via an optical fiber cable. It is characterized in that it is configured to transmit data.

(Example) Next, the present invention will be explained in detail with reference to the illustrated example.
In Fig. 1, 111 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 In addition, (8) has the tip connected to the ground electrode (3
) with a nand (9), and the base end is fixed with bolt 0 (I
The ground electrode (3) is fixed to the mounting bracket (6) by
is a conductor that connects to the mounting bracket (6), and a search coil (11) for detecting the current flowing through the conductor (8) is wound around the outer periphery of the large diameter portion at the center multiple times. As shown in Fig. 2, this search coil (11) is provided with an intermediate terminal (30) for taking out current, a load resistor (12) is connected in series to both the left and right terminals, and a surge absorber ( 13) In addition to the Zener diode (14) connected in parallel, a diode (15) for full-wave rectification of the current flowing through the conductor (8) is also connected, and an LED that emits light when current flows. , LD and other light emitting devices (
16) are connected in parallel. These light emitting elements (16) are connected to the light receiving end (17) of the optical fiber cable,
(1B) are installed facing each other, and the optical signals from the light emitting elements (16) are combined by a multiplexer (19), and then sent to a detector installed on a steel tower etc. via an optical fiber cable (20). The signal is transmitted to the device (21). Further, the search coil (11) is made up of a portion with a small number of coil turns for small current measurement, and forms one coil as a whole.

As shown in Figure 3, the detector (21) is a light receiving element (22) that converts an optical signal into an electrical signal, and determines whether the electrical signal is due to lightning current or a follow-up current due to deterioration of the lightning protection element. a discriminator (23), a counter (23) for the number of operations
4), a display device (25), a transmitter (26) for attaching and transmitting an address, and an E(1) converter (27) for converting an electrical signal back into an optical signal. In this embodiment, the 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 in the insulator body acts as a conductor to ground the lightning current against a sudden voltage during a lightning strike. The protection of the power transmission and distribution lines by escaping to the ground side via the electrode (3), conductor (8), and mounting bracket (6) is the same as in the conventional case. However, in the lightning arrester of the present invention, a search coil (11) is wound around the outer periphery of the conductor (8), and this search coil (11) has a light emitting element (
16) is connected, so if the lightning arrester is activated and lightning current flows through the conductor (8), the value will be large, so it will be detected in the part with fewer turns of the search coil (11), and the circuit will be The connected light emitting element (16) emits light. Furthermore, if the lightning arrester (2) fails or deteriorates, not only the lightning current but also a subsequent ground fault current called a follow-on current will flow from the grounding electrode (3) to the conductor (8). The follow-on current is a commercial frequency alternating current that is smaller than the lightning current, so it is detected in the part with a large number of turns of the search coil (11).
The light emitting element (16) connected to the circuit emits light. The optical signals from such a light emitting element (16) are combined by a multiplexer (19) and sent to a detector (shown in FIG. 3) via an optical fiber cable (20).
21), is converted into an electric 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. E(1) converter (
27), the signal is converted into an optical signal again and transmitted to a monitoring station or the like via an overhead ground optical fiber cable (29). In addition,
As shown in Figure 4, the discriminator (23) takes advantage of the fact that lightning current is a single direct current and that the follow-up current after full-wave rectification is a repeating wave, and shapes the waveform to distinguish it from lightning current. It determines whether the current is a follow-on current or not, and also sends a signal to a counter (24) for the number of operations and a display (25). The light emitting elements (16) and (16) are, for example, 0.8 μm band and 1.
If the light emission wavelengths are different, such as in the 3 μm band, it is possible to more easily determine whether the lightning current on the discriminator (23) side is a follow-on current. Furthermore, by increasing the number of turns of the search coil (11), it is also possible to detect the leakage current of the lightning arrester (2) of several mA or less, which is much weaker than lightning current or follow-on current.

(Effects of the Invention) As is clear from the above description, the present invention is such that a search coil is wound around the outer periphery of a conductor that connects a ground electrode and a mounting bracket, and a light emitting element is connected to this search coil. Therefore, the lightning current that flows to the ground electrode through the lightning protection element during a lightning strike, and the subsequent current that flows to the ground electrode when the snow element deteriorates or breaks down, can be reliably detected as changes in the light emission intensity of the light emitting element, and this can be detected at monitoring stations, etc. It is something that can be transmitted to. 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 a light emitting element is used to detect lightning current and follow-on current, so the absolute value of lightning current, follow-on current, and leakage current, which have greatly different current values, can be detected by a single coil with a positive 61. In addition, the structure of the sensor part is simple, so there is little risk of failure, and assembly and adjustment are easy.Furthermore, the signal transmission section uses optical fiber, so there is no electromagnetic induction or static N induction. It is possible to maintain accurate accuracy over a long period of time without being affected by the Therefore, the present invention eliminates the problems of conventional lightning arresters 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 its main parts, Fig. 3 is a block diagram showing the operation of the detector, and Fig. 4 is a lightning current and follow-on current. FIG. 2 is a block diagram showing the operation of a discriminator. (1): Insulator body, (2): Escape: element, (3): Ground electrode, (6): Mounting bracket, (8): Conductor, (11):
Search coil, (16) + light emitting element, (20): optical fiber cable, (21): detector.

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) that detects the current flowing through the conductor (8) is wound around the outer circumference of the conductor (8), and a light emitting element (16) that converts the current flowing through the search coil (11) into an optical signal is attached to the search coil (11). A lightning arrester with an operation sensor, characterized in that the light signal is connected to a detector (21) via an optical fiber cable (20) and transmitted to a detector (21).