JPH0656336B2 - Winding temperature measuring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a winding temperature measuring device, and more particularly, to a winding temperature in order to control a power transformer and detect an abnormality with high accuracy and without time delay. The present invention relates to a winding temperature measuring device for directly measuring the temperature.

[Prior Art] FIG. 3 shows a conventional winding temperature measuring device. As shown in the figure, the winding layer (1) is wound around the first insulating cylinder (3a) via the vertical spacer (4a). An insulating spacer (2) is provided between each winding layer (1). A vertical spacer (4b) and an insulating tube (3b) are provided on the outside of the winding layer (1).
The insulating spacer (2) is held by the vertical spacers (4a) and (4b). The optical temperature sensor (5) to which the optical fiber (6) is connected is inserted into the space (8) formed by the sensor spacer (7).

Next, a method and an operation for incorporating the conventional winding temperature measuring device will be described. First, the vertical spacer (4a) is bonded to the insulating cylinder (3a). After that, the winding is wound in order from the inside, the sensor spacer (7) and the optical temperature sensor (5) are inserted in the middle of one winding layer, and the winding is wound up to the outermost layer to form one layer. Line layer (1)
To form. Next, the insulating spacer (2) is attached to the vertical spacer (4a), and the winding of the next layer is wound. During this time, the optical fiber
Wrap (6) in a circle and secure to winding (1). After forming the winding layer, the vertical spacer (4b) and the insulating cylinder (3b) are attached, and the optical fiber (6) is drawn out through the space between the winding (1) and the insulating cylinder (3b). Since the optical temperature sensor (5) is inserted between the windings (1), it is in direct contact with the winding layer (1) and the temperature of the windings can be measured.

The optical temperature sensor utilizes a phenomenon in which the light absorption edge wavelength of a semiconductor such as GaAs or CdTe shifts to a longer wavelength side as the temperature rises. Focusing on the fact that the amount of transmitted light decreases as the temperature rises, the temperature is measured by detecting the amount of transmitted light. Since the light temperature sensor is connected to the light emitting part and the light receiving part (not shown) outside the transformer only by the optical fiber, the temperature of the high voltage winding can be directly measured. Moreover, since the measurement method uses light, highly accurate temperature measurement can be performed without being affected by a high electric field or a high magnetic field in the transformer. In addition, the winding temperature of a transformer is usually estimated by adding the correction considering the load current to the value of the temperature of the cooling medium such as mineral oil and SF ₆ gas measured by a thermometer attached to the transformer tank. By directly measuring the winding temperature, it is possible to improve the measurement accuracy and eliminate the time delay.

[Problems to be Solved by the Invention] In the conventional winding temperature measuring device, since the optical temperature sensor is inserted between the windings, it is necessary to incorporate the optical temperature sensor during the winding work. In this case, an optical fiber of 5 to 10 m is needed to draw it out of the transformer tank. A small-diameter optical fiber is easily broken, so that there is a problem that the drawn-out optical fiber reduces the efficiency of winding work. In addition, since the part of the optical temperature sensor that is not in contact with the winding (1) is exposed to the winding cooling medium such as mineral oil or SF ₆ gas, the measured value will be lower than the actual winding temperature. It was The present invention has been made to solve the above problems, and an object of the present invention is to obtain a winding temperature measuring device that can measure the winding temperature with high accuracy without reducing the efficiency of the winding work. To do.

[Means for Solving the Problems] In the winding temperature measuring device of the present invention, an optical temperature sensor is inserted into a recess formed in one of the surfaces of the insulating spacer inserted between the winding layers, the surface facing the winding layer. Then, the exposed surface is brought into close contact with the winding layer.

[Operation] In the winding temperature measuring device of the present invention, since the exposed surface of the optical temperature sensor is in close contact with the winding layer to be measured, the temperature is accurately detected, and the optical temperature sensor is used after winding the winding. To be inserted into the recess of the insulating spacer.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a front sectional view thereof. As shown in the figure, the plurality of winding layers (1) are wound around the first insulating cylinder (3a) via the vertical spacers (4a), and there is insulation between the winding layers (1). Spacers (2) are provided. A vertical spacer (4b) and an insulating cylinder are provided on the outer circumference of the winding layer (1).
(3b) is provided, winding layer (1) and insulating spacer (2)
Are held by the vertical spacers (4a) (4b). A recess (2a) corresponding to the shape of the optical temperature sensor is formed on one surface of the insulating spacer for embedding the optical temperature sensor (5). In this embodiment, the recess (2a) is the optical temperature sensor (5).
Is formed obliquely to the diametrical direction of the insulating cylinder (3b) so that it can be easily inserted. In addition, since the recess (2a) detects the temperature of the highest temperature part of the winding, the tip of the optical temperature sensor (5), which is the temperature sensitive part, is formed so as to be located in the center of the winding layer (1). Has been done. Furthermore, when the optical temperature sensor (5) is inserted into the concave portion (2a), the exposed surface of the optical temperature sensor (5) becomes an insulating spacer.
It is formed so as to be located substantially on the same plane as the surface on which the concave portion (2a) of (2) is formed.

Next, a method of incorporating the winding temperature measuring device of the present invention will be described. After the vertical spacer (4a) is bonded to the insulating cylinder (3a), the winding is wound to form a winding layer (1) for one layer. Next, the insulating spacer (2) is attached to the vertical spacer (4a), and the winding of the next layer is wound. After completing the winding process, the optical temperature sensor
(5) is inserted into the recess (2a) provided in the insulating spacer (2). Next, attach the vertical spacer (4b) and the insulating tube (3b), and
Pull out (6) to the outside through the winding (1) and the insulating tube (3b).
The assembled winding assembly is tightened in the axial direction with a strong pressure. As a result, the optical temperature sensor (5) embedded in the insulating spacer (2) is closely fixed to the winding layer (1). The optical temperature sensor (5) is fixed only by pressure, but may be adhered when it is inserted into the insulating spacer (2).

As described above, in the winding temperature measuring device of the present invention,
It is not necessary to assemble the optical temperature sensor (5) during the winding work, and it can be assembled after the winding is completed. Therefore, the efficiency of the winding work is not reduced, and the optical fiber is not broken during the winding work.

In the winding temperature measuring device configured as described above,
Since the optical temperature sensor is embedded in the recess (2a) of the insulating spacer (2) and the exposed surface is in close contact with the winding layer (1), the optical temperature sensor (5) can be used for winding mineral oil or SF ₆ gas. The winding temperature can be measured accurately without any time delay without directly contacting the wire cooling medium.

Further, in the above-mentioned embodiment, since the temperature sensing portion (tip) of the optical temperature sensor (5) is in close contact with the central portion in the winding thickness direction of the winding layer, the temperature of the high temperature portion of the winding can be accurately and highly sensitive. Can be measured.

The temperature sensor may be contained in a protective container made of ceramic or the like.

The exposed surface of the temperature sensor may have a shape corresponding to the shape of the surface of the winding layer with which the temperature sensor is in close contact, and may be not only a flat surface but also a curved surface.

Further, in the above-described embodiment, the optical temperature sensor is a sensor that utilizes the temperature characteristic of the light absorption edge wavelength, but the sensor is not limited to this, and another sensor may be used.

[Advantages of the Invention] As described above, according to the present invention, the optical temperature sensor is embedded in the insulating spacer so as to be in close contact with the winding layer. Therefore, the winding can be performed with high accuracy without being affected by the cooling medium. The temperature can be measured, and since the optical temperature sensor can be incorporated after the winding work is completed, there is an effect that a winding temperature measuring device can be obtained that does not reduce the efficiency of the winding work.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a front sectional view thereof, and FIG. 3 is a plan view showing a conventional winding temperature measuring device. (1) is a winding layer, (2) is an insulating spacer, and (5) is an optical temperature sensor. The same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. An insulating spacer inserted between winding layers and having a recess on one of the surfaces facing the winding layer, the insulating spacer being embedded in the recess of the insulating spacer and having its exposed surface in close contact with the winding layer. Winding temperature measuring device equipped with an optical temperature sensor.