JPH01211819A - Disconnector with optical ct - Google Patents

Abstract

PURPOSE:To take out an output to outside as an optical signal rarely having noise by putting an optical fiber into a center hole in an insulator, sealing it with resin and connecting the filter taken out from the insulator to an optical current sensor or a connector via sealed cabin. CONSTITUTION:An optical fiber 6 is put into a center slot 5 of an insulator 2, sealed with a sealing agent 7 and taken out in upper direction via a projection portion 8 of the sealing agent 7 to be connected to an optical current sensor 12 via a sealed cabin 15. A magnetic shield plate 14 is provided over the inner face of a sensor containing case 13 on a conductor mounting member 4. A current is, thus, accurately measured without influence of magnetic field. The optical fiber 6 taken out from the lower end of the insulator 2 is taken out to outside via an airtight connector 17 in a sealing container 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a disconnector with optical CT used to open and close lines and busbars in power plants, substations, and the like.

(Conventional technology) At power plants and substations, circuit breakers and disconnectors are used in combination to switch on and off lines and busbars through which large currents flow, but disconnectors do not have sufficient load switching capacity. Because it is a device, it must be operated with the power transmission to the power line stopped. For this reason, conventional methods have been devised such as opening the disconnect switch at the substation after confirming that the disconnect switch installed in the power line on the power supply side has been opened, such as by making a telephone call.
There is a risk of communication errors, so it is desirable to have a means to check whether the disconnector itself is energized or not.It has long been known to place an insulator type current transformer near the disconnector for this purpose. It is being However, since this current transformer is an independent device, it requires extra installation space and has the disadvantage of being expensive to install. Also, a current transformer may be attached to the bushing, but this has the disadvantage that it cannot be used for any transformer other than the one in which the bushing is used. Furthermore, since the outputs of these current transformers are taken out as electrical signals, there is a possibility that they may be affected by noise from surrounding electric fields and the like.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional problems by incorporating a means for detecting the presence or absence of current and fault current in the disconnector itself supported by an insulator. It is equipped with an optical CT that can save installation space and installation cost, and can be used for transformers other than transformers that use bushings.In addition, the output to the outside can be extracted as an optical signal with less noise. It was completed for the purpose of being a disconnector.

(Means for Solving the Problems) The invention of the present application cylinder 1, which was made to solve the above problems, supports the conductor mounting part of the disconnector on the upper end of the insulator in which the optical fiber is built-in, and the conductor mounting part is attached to the conductor mounting part. is characterized in that a photocurrent sensor that converts current into an optical signal is directly attached, a magnetic field shield plate is installed around it, and an optical fiber drawn out from the upper end of the insulator is connected to the photocurrent sensor through an airtight chamber. In order to solve the common problem, the invention of the present invention is to pass an optical fiber into a through hole formed in the insulator body, and to fill the inside of this through hole with an insulating gas. The conductor attachment part of the disconnector is supported on the upper end of the insulator, and a photocurrent sensor that converts the current into an optical signal is attached to this conductor attachment part. It is characterized by being connected to a current sensor.

(Example) Next, the present invention will be described in more detail with reference to illustrated examples.

FIG. 1 is a sectional view showing an embodiment of the first invention, (1
) is the base, (2) is the insulator, and (3) is the blade of the Shinroki rotatably supported on the adjacent insulator (not shown).
(4) is a conductor attachment part of a disconnector supported on the upper end of the insulator (2). The insulator (2) has an optical fiber (6) for transmitting optical signals built into the through hole (5), and the optical fiber (6) is bonded to the insulator ( It is fixed inside the through hole (5) of 2), and both upper and lower ends are held by protrusions (8) of sealing material. It is a lid, and the conductor mounting part (4) of the disconnector is supported on its upper part.The conductor mounting part (4) consists of a contact α for receiving the blade (3) and a terminal plate (11). A photocurrent sensor (12) is provided directly on the terminal plate (11) of this conductor attachment part (4).The photocurrent sensor (12) has a function of converting current into an optical signal. Faraday elements such as YIGSBSO with 6) is used. (
13) is a sensor storage case provided so as to surround the conductor mounting part (4), and as shown in an enlarged view in Fig. 2, an external magnetic field is used to activate the photocurrent sensor (12). Magnetic field shield plate (1
4) is installed on the entire inner surface of the sensor storage case (13). A magnetic material is used as the magnetic field shield plate (14), and most commonly an iron plate may be used.The bottom surface of the sensor storage case (13) and the lid (9) are connected to each other by a vibrator-shaped airtight chamber (15). The optical fibers (6
) is pulled out from the upper end of the insulator (2) and this airtight chamber (15)
The photocurrent sensor (12) inside the sensor storage case (13) is connected to the photocurrent sensor (12). The airtight chamber (15) is intended to prevent rainwater from entering and deteriorating the optical fiber +6), and also prevents rainwater from entering into the inside of the insulator (2). On the other hand, the lower end of the insulator (2) has an airtight container (
16), and as shown in Fig. 1, the optical fiber (6) is kept airtight by this airtight container (16) and is pulled out to the outside via the airtight connector (17), and the optical signal is transmitted to the outside. can be taken out.

FIG. 4 shows an embodiment of the second invention, in which a through hole (5) formed in the center of the insulator body (2a) is shown.
An insulator (2) is used in which an optical fiber (6) is passed through the inside of the insulator (2) and an insulating gas such as SF&gas is sealed in the through hole (5). A lid (9) and an airtight chamber (15) are provided at the upper end of this insulator (2) as in the first invention, and the optical fiber (6) is connected to the lid (9) through an airtight connector (18). ) and an airtight chamber (15), and is further connected to a photocurrent sensor (12). An airtight container (16) is also provided at the bottom of the insulator (2), and an optical fiber (6
) is also drawn out to the outside via an airtight connector (17), which is similar to the first invention. However, in the second invention, the photocurrent sensor (12) may be provided with an iron core, and the magnetic field shield (14) may be omitted. Further, the airtight container (16) houses a pressure sensor for detecting leakage of insulating gas, a desiccant material for keeping the inside dry, and the like.

(Function) With this structure, the blade (3) is rotated and both ends of the blade (3) are attached to or detached from the contact a of the conductor mounting part (4) supported on the upper end of the insulator (2). It is similar to a conventional disconnector in that it opens and closes an electric circuit by turning the switch. However, in the disconnector of the present invention, since the photocurrent sensor (12) is attached to the conductor attachment part (4), the photocurrent sensor (12) converts the current into an optical signal while the circuit is energized. This optical signal can be converted and taken out to the outside through an optical fiber (6) built into the insulator (2). This reliably prevents the disconnector from being opened or closed while it is energized, and even in the event of a power outage or other trouble, it is easy to know whether the electrical path passing through the new circuit switch is energized or not. Therefore, restoration work etc. can be carried out quickly.

In this way, the disconnector of the present invention is capable of extracting the line current as an optical signal to the outside, and is operable because it uses an optical fiber (61) as a signal transmitter, which is less susceptible to noise caused by surrounding electric fields, etc. is reliable and highly reliable, and the optical fiber (6) has excellent insulation properties, so it can be used safely in high voltage circuits.

In particular, in the first invention, since the photocurrent sensor (12) is directly attached to the conductor attachment part (4) of the disconnector, the overall structure can be simplified and lightened, and moreover, the magnetic field shield Since the plate (14) is installed around the device, it is not affected by external magnetic fields and accurate operation can be achieved. Moreover, in the second invention, the optical fiber (6)
Since the insulator (2) having a built-in insulator (2) is of an insulating gas filled type, insulation is reliable, and the structure is simple and assembly is easy.

In both inventions, the upper end of the insulator (21) is connected to the lid (9).
), the airtight chamber (15), etc., so that it does not deteriorate due to contact with rainwater or outside air, and long-term reliability can be improved. Moreover, in the present invention, an optical fiber (6) is built inside the insulator (2) which is necessarily used to support the disconnector, and a photocurrent sensor (12) is attached to the upper end of the insulator (2). Therefore, it can be easily installed by simply replacing the insulator of a conventional disconnector, and does not require extra installation space.
It is also much more economical than providing a separate current transformer.

(Effects of the Invention) As is clear from the above description, the present invention has the following features: it is easy to install or replace an existing disconnector, it can be made compact as a whole without requiring extra installation space, and it is possible to use optical fibers easily. It has many advantages, such as no noise because it is used, no insulation problems when used in high voltage circuits, and long-term (t!1) performance because it has an airtight structure.

Therefore, the present invention greatly contributes to the development of industry as a disconnector with optical CT that eliminates the problems of the conventional technology.

[Brief explanation of the drawing]

FIG. 1 is a central vertical sectional view showing an embodiment of the first invention;
The figure is an enlarged sectional view of the main part, Figure 3 is a side view, and Figure 4 is a side view.
The figure is a central vertical sectional view showing an embodiment of the second invention. (2): Insulator, (2a): Insulator body, (4): Conductor attachment part, (6): Optical fiber, (12): Photocurrent sensor, (15): Airtight chamber. lγ Figure 2 Figure 3

Claims (1)

[Claims] 1. A conductor attachment part (4) of a disconnector is supported on the upper end of an insulator (2) containing an optical fiber (6), and a current is connected to the conductor attachment part (4) by an optical signal. A photocurrent sensor (12
) is directly attached and a magnetic field shield plate (
14), and an optical fiber (6) drawn out from the upper end of the insulator (2) is connected to the photocurrent sensor (12) via an airtight chamber (15). . 2. The optical fiber (6) is passed through the through hole (5) formed in the insulator body (2a), and the through hole (
The conductor mounting part (4) of the disconnector is supported on the upper end of the insulator (2) filled with insulating gas inside the insulator (5).
A photocurrent sensor (12) that converts current into an optical signal is attached to 4), and an optical fiber (
6) through the airtight chamber (15) to the photocurrent sensor (12).
) A disconnector with an optical CT.