JP2644784B2 - Insulator device with optical signal transmission function - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an insulator device having an optical signal transmission function used for detecting current in a line or a bus at a power plant, a substation, or the like. .

(Prior art) In order to open and close lines and buses through which large currents flow in power plants and substations, disconnectors of circuit breakers are used in combination, but the disconnectors do not have sufficient load switching ability Therefore, it is necessary to operate with power transmission to the electric circuit stopped. For this reason, in the past, it was confirmed that the disconnector provided on the power supply side was opened by telephone communication, etc., and then devised such as opening the disconnector at the substation, but there is a risk of communication error It is desired that the disconnecting switch itself has a means for confirming the presence or absence of energization. It is conventionally known to arrange an insulator type current transformer near a disconnector for such a purpose. However, since this current transformer is an independent device, it requires extra installation space and has a disadvantage that the installation cost is expensive. Although a current transformer may be attached to the bushing, there is a drawback that the current transformer cannot be used except for a transformer using the bushing. Furthermore, since the outputs of these current transformers are taken out as electric signals, they may be affected by noise due to surrounding electric and magnetic fields.

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above and incorporates means for detecting the presence or absence of energization and fault current in the disconnector itself supported by the insulator. An optical signal that can save extra installation space and installation costs, can be used for other than transformers that use bushings, and can take output to the outside as an optical signal that is less likely to contain noise. It has been completed for the purpose of an insulator device having a transmission function.

(Means for Solving the Problems) The present invention relates to a solid insulator in which an optical fiber is incorporated in a central hole of a solid insulator main body, and the inside of the hole is sealed with a resin. A terminal plate supported by a lid at the upper end of the device, and a photocurrent sensor in which a donut-shaped iron core provided to surround the terminal plate is combined with a Faraday element, and the photocurrent sensor is airtightly connected directly to the lid. An optical fiber drawn from the upper end of the insulator is directly connected to the photocurrent sensor via the hermetic pipe, and the lower end of the insulator is hermetically sealed with an airtight container for taking out an optical signal while maintaining airtightness. And a connector.

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

FIG. 3 shows an example of the entire mounting structure.
(1) a base, (2) a solid insulator, (3) a disconnector blade rotatably supported by a central insulator (2),
(4) is a conductor mounting portion of the disconnector supported on the upper end of the insulator (2) on both sides, and (5) is an operation box.

As shown in FIG. 1, the insulator (2) on one side is provided with a small-diameter through hole in the center of the solid insulator body, and an optical fiber (6) for transmitting an optical signal is built therein. The optical fiber (6) is fixed inside the center hole of the insulator (2) by a sealing material (7) such as a silicone resin, an epoxy resin, a urethane resin or the like. It is held by a projection (8). If the optical fiber (6) is not fixed inside the solid insulator (2) by the sealing material (7) as described above, the optical fiber (6) may be broken by vibration or the like.

Reference numeral (9) denotes a lid attached to the upper end of the insulator (2) in close contact with the insulator, and the conductor mounting portion (4) of the disconnector is supported above the lid. The conductor mounting portion (4) comprises a contact (10) for receiving the blade (3) and a terminal plate (11). The conductor mounting portion (4) surrounds the terminal plate (11) of the conductor mounting portion (4). A donut-shaped photocurrent sensor (12) is provided. This photocurrent sensor (12) has a structure supported by an airtight pipe (15) from a lid (9). For this reason,
Even if the structure and dimensions of the terminal board (11) change, it can be mounted.
In addition, the current can be accurately detected. As the photocurrent sensor (12), various sensors can be used as long as they have a function of converting a current into an optical signal. In this embodiment, a donut-shaped iron core (13) and a YIG, BSO
A combination of the Faraday element (14) and the like is used. In this case, two optical fibers (6) for optical input and optical signal extraction are used to detect the current using the rotation of the polarization plane due to the magnetic field. The donut-shaped iron core prevents the influence of the surrounding magnetic field, and has the function of collecting the generated magnetic field in the iron core, so that the sensitivity of the current sensor can be improved. (15) is an airtight pipe protruding from the side of the lid (9), and the optical fiber (6) drawn from the upper end of the insulator (2) is an airtight pipe (1).
It passes through the inside of 5) and is directly connected to the Faraday element (14) of the photocurrent sensor (13). The airtight pipe (15) is for preventing rainwater from entering and deteriorating the optical fiber (6) and the resin sealing portion, and also prevents rainwater from entering the inside of the insulator (2). ing. On the other hand, an airtight container (16) is provided at the lower end of the insulator (2). As shown in FIG. 2, the optical fiber (6) is kept airtight by the airtight connector (17) while being kept airtight by the airtight container (16). ), And an optical signal can be extracted to the outside by an optical cable (18) or the like shown in FIG.

(Operation) With the above-described structure, the blade (3) is rotated by the shaft (19) extending from the operation box (5) to the central insulator (2), and both ends of the blade (3) are disposed on both sides of the insulator (2).
The electric circuit is opened and closed by engaging or disengaging the contact (10) of the conductor mounting portion (4) supported on the upper end of (2) as in the conventional case. However, in the insulator device of the present invention, since the photocurrent sensor (12) is mounted on the conductor mounting portion (4), the photocurrent sensor (12) transmits the current to the optical signal while the circuit is in a conductive state. And the optical signal can be extracted to the outside through an optical fiber (6) built in the insulator (2). For this reason, it is possible to reliably prevent the disconnecting switch from being opened and closed while the power is being supplied, and to easily know whether or not the electric circuit passing through the disconnector is supplied with electricity even when a trouble such as a power failure occurs. Since it can be performed, recovery work can be performed quickly. As described above, the insulator device of the present invention can take out the current of the line as an optical signal to the outside, and uses the optical fiber (6), which is hard to enter noise due to the surrounding electric field and magnetic field, as the signal transmitting body. Therefore, the operation is reliable and high in reliability, and the optical fiber (6) is also excellent in insulation, so that it can be used in high-voltage circuits with confidence. Furthermore, in the present invention, the optical fiber (6) and the resin sealing portion are made of the insulator (2) and the airtight pipe (1).
5) Since the airtight container (16) and the airtight connector (17) are kept airtight, they do not deteriorate due to contact with rainwater or outside air, and can improve long-term reliability. Moreover, in the present invention, the optical fiber (6) is built in the insulator (2), and the photocurrent sensor (12) supported by the airtight pipe (15) is attached to the upper end thereof. It can be easily installed simply by replacing the insulator of the device, does not require extra installation space, and is much more economical than providing a separate current transformer. If a donut-shaped photocurrent sensor is used as in the embodiment, attachment to an existing disconnector can be performed very easily.

(Effects of the Invention) As is clear from the above description, the present invention can be easily attached to or replaced with an existing disconnector, can be made compact as a whole without requiring an extra installation space, and uses an optical fiber. Therefore, there are many advantages such as no noise and no problem in insulation even when used in a high voltage circuit, and long-term reliability can be obtained due to the hermetic structure. Therefore, the present invention greatly contributes to industrial development as an insulator device having an optical signal transmission function that has eliminated the conventional problems.

[Brief description of the drawings]

1 is a cross-sectional view showing a main part of an embodiment of the present invention, FIG. 2 is a cross-sectional view of a lower portion of an insulator viewed from a lateral direction, and FIG. 3 is a front view showing an example of an entire mounting structure. (2): insulator, (6): optical fiber, (11): terminal plate,
(12): Photocurrent sensor, (13): iron core, (14): Faraday element, (15): hermetic pipe, (16): hermetic container,
(17): Airtight connector

Claims (1)

(57) [Claims] 1. A solid insulator (2) having a built-in optical fiber (6) in a central hole of a solid insulator main body and sealing the inside of the hole with a resin, and the insulator (2). A terminal plate (11) supported by a lid (9) at the upper end of the device, and a doughnut-shaped iron core (13) provided to surround the terminal plate (11) are combined with a Faraday element (14) by a photocurrent sensor ( 12) and
The photocurrent sensor (12) is supported by an airtight pipe (15) directly connected to the lid (9), and an optical fiber (6) drawn from the upper end of the insulator (2) is connected to the airtight pipe (15). And an airtight container (16) and an airtight connector (17) at the lower end of the insulator (2) for taking out an optical signal while maintaining airtightness. An insulator device having an optical signal transmission function.