JPH0688753A - Optical fiber sensor - Google Patents

Abstract

PURPOSE:To provide a new optical fiber temperature sensor where a sensor fiber prevents destruction of the optical fiber temperature sensor main body due to short circuit even in the case of measuring a high voltage part and the optical fiber temperature sensor easily standardizes a position of an insulator. CONSTITUTION:Loads are applied through a bus bar to the high-voltage side of a transformer 1, and a spot sensor 4 monitors the temperature of the connection part between the bus bar 2 and the load. With this configuration, between the spot sensor 4 side and an optical fiber temperature sensor main body 10, an insulator with built-in optical fiber 5, having a fusion box 7 for housing a fusion paint at its both ends, is used as an insulating object for a sensor fiber 3. At this time, the gap between the insulator 5 and the sensor fiber 3 is filled up with a sealing agent 6 (for example, epoxy) of high insulating character. In addition, the fusion box 7 and the bobbin for a fiber are made of the metal of high thermal conduction, and these are heated with a dryer, etc., so that the temperature of optical fiber rises easily, for easily specifying the position of the insulator 5 in the longitudinal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber temperature sensor.

[0002]

2. Description of the Related Art Here, an optical fiber temperature sensor refers to a sensor which measures a distance distribution of backscattered light generated in a sensor fiber and detects a temperature distribution along the sensor fiber.

The insulation of the sensor fiber of the conventional optical fiber temperature sensor from the high voltage portion has not been considered in particular. For example, the sensor fiber from the spot sensor that monitors the high voltage part of the transformer to the optical fiber temperature sensor has not been insulated.

[0004]

However, when the sensor fiber is used for temperature monitoring of a high voltage part such as a transformer, if the sensor fiber is not insulated, the coating of the sensor fiber deteriorates and absorbs moisture. Could lead to a short circuit accident.

The object of the present invention is to solve the above-mentioned drawbacks of the prior art, prevent destruction of the optical fiber temperature sensor main body due to a short circuit even when the sensor fiber is measuring a high voltage portion, and prevent the optical fiber temperature sensor from being damaged. It is to provide a novel optical fiber temperature sensor whose position can be easily located.

[0006]

SUMMARY OF THE INVENTION The gist of the present invention is to provide insulation between a spot sensor for measuring a high voltage part and an optical fiber temperature sensor body by using an insulator having a sensor fiber at its center. Even when the sensor fiber deteriorates and absorbs moisture, the optical fiber temperature sensor main body is prevented from being broken due to a short circuit, and the fusion boxes attached to both ends of the insulator and the fiber bobbin housed inside the fusion box are heated. The reason for this is that the locator of the insulator is simplified by making them highly conductive and heating them.

That is, the above object of the present invention is to provide an optical fiber temperature sensor in which the temperature of the busbar and the load from the high voltage section is monitored in the optical fiber temperature sensor main body by a signal from the spot sensor. And an optical fiber temperature sensor body, an optical fiber temperature sensor characterized in that an insulator with a built-in sensor fiber is attached to both ends of which a fusion box capable of accommodating the fusion points of the sensor fiber is attached. .

At this time, it is preferable that the fusion box and the fiber bobbin contained in the fusion box are made of metal having high thermal conductivity.

The insulator incorporating the sensor fiber in the present invention is used as an insulator of the sensor fiber. Therefore, a highly insulating sealing agent such as epoxy is sealed in the gap between the built-in sensor fiber and the insulator.

The fusion-bonding box in the present invention is a portion for accommodating a fusion-bonding point between the sensor fiber incorporated in the insulator and the sensor fiber of the optical fiber temperature sensor, in order to simplify the attachment of the insulator. For adjusting the tension applied to both ends of the insulator, a fiber bobbin around which a sensor fiber is wound for adjusting the tension and a fusion point are accommodated in the fusion box. As a feature of the present invention, it is preferable that the fusion box and the fiber bobbin are made of a metal having high thermal conductivity in order to simplify the positioning of the insulator of the optical fiber temperature sensor.

In the present invention, when an optical connector is used to connect the sensor fibers, light loss and reflection are affected, so fusion is preferably used.

[0012]

Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, when the load is applied from the high voltage side of the transformer 1 through the bus bar and the temperature of the connector between the bus bar 2 and the load is monitored by the spot sensor 4, the spot sensor 4 side and the optical fiber are connected. Temperature sensor body 1
The optical fiber built-in insulator 5 provided with the fusion-bonding boxes 7 capable of accommodating fusion-bonding points at both ends is used as an insulator of the sensor fiber 3. At that time, epoxy is filled in the gap between the insulator 5 and the sensor fiber 3 as a sealing agent 6 having high insulating properties. Further, as shown in FIG. 2, the fusion box 7 and the fiber bobbin 9 are made of a metal having a high thermal conductivity, and the temperature of the optical fiber is easily raised by heating them with a dryer or the like. Positioning in the longitudinal direction can be facilitated.

[0013]

As described above, the present invention has the following remarkable effects. First, when keeping the fiber sensor of the optical fiber temperature sensor close to the high voltage part for a long time,
The sensor fiber may be short-circuited due to moisture absorption due to deterioration, but such an accident never occurs if the insulator with an optical fiber of the present invention is used here.

Further, the installation of the insulator is simplified by installing a fusion box capable of accommodating the fusion points at both ends of the insulator. (When an optical connector is used, the optical loss and reflection influences the defect. Better). Further, by protecting the tension applied to both ends of the insulator with this fusion bonding box, the cutting of the fiber and the like can be avoided.

By making the fusion-bonding boxes at both ends of the insulator and the bobbin for the fiber metallic so as to have a high thermal conductivity, when this is heated by a dryer or the like, heat is well transferred to the fiber,
Positioning in the longitudinal direction of the fiber with the optical fiber temperature sensor is simplified.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an insulator with a built-in optical fiber for an optical fiber temperature sensor of the present invention and an insulating method thereof.

FIG. 2 is an enlarged cross-sectional view showing a fusion bonding box of an optical fiber built-in insulator for an optical fiber temperature sensor of the present invention.

[Explanation of symbols]

 1 Transformer 2 Busbar 3 Sensor Fiber 4 Spot Sensor 5 Insulator 6 Sealing Agent 7 Fusion Box (Metallic) 8 Fiber Fusion Point 9 Fiber Bobbin (Metallic) 10 Optical Fiber Temperature Sensor Main Body

Claims (2)

[Claims] 1. An optical fiber temperature sensor in which a temperature of a bus bar from a high voltage section and a connector section of a load are monitored by a main body of the optical fiber temperature sensor in response to a signal from the spot sensor, the spot sensor and the main body of the optical fiber temperature sensor. An optical fiber temperature sensor, characterized in that an insulator with a built-in sensor fiber is provided between both ends of which is provided with a fusion box capable of accommodating the fusion points of the sensor fiber. 2. The optical fiber temperature sensor according to claim 1, wherein the fusion bonding box and the fiber bobbin contained in the fusion bonding box are made of metal having high thermal conductivity.