JPH01284722A - Winding temperature measuring instrument - Google Patents

Abstract

PURPOSE:To measure the temperature of winding with high accuracy without being affected by a cooling medium and to prevent the efficiency of winding operation from decreasing by embedding an optical temperature sensor in an insulation spacer in contact with a winding layer. CONSTITUTION:An insulation cylinder 3a is constituted by adhering a longitudinal spacer 4a, and then winding a coil into one winding layer 1. Then, the insulation spacer 2 is fitted to the longitudinal space 4a, and a next coil is wound into a layer. The optical temperature sensor 5 is inserted into a recessed part 2a formed in the insulation spacer 2 after the coil winding process. Then a longitudinal spacer 4b and an insulation cylinder 3b are fitted and an optical fiber 6 is led out through between the winding 1 and insulation cylinder 3b. The completed winding assembly is clamped axially with strong pressure. Consequently, the optical temperature sensor 5 embedded in the insulation spacer 2 is fixed in contact with the winding layer 1 to accurately detect the temperature.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a winding temperature measuring device, and more specifically, the present invention relates to a winding temperature measuring device that measures the winding temperature in order to control power transformers and detect abnormalities with high precision and without time delay. This invention relates to a winding temperature measuring device that directly measures winding temperature.

[Prior Art] As shown in Figure 3, which shows a conventional winding temperature measuring device, a winding M (1) is installed in a first insulating cylinder (3a) via a vertical spacer (4a). It is wrapped. Between each winding layer (1)! e! Edge spacers (2) are provided.

A vertical spacer (4b) and an insulating tube (3b) are provided on the outside of the winding layer (1), and the winding MJ (1) and the insulating spacer (2) are separated by the vertical spacers (4a) (4b). Retained. An optical temperature sensor (5) connected to an optical fiber (6) is inserted into the space (8) formed by the sensor spacer (7).

Next, a method of incorporating the conventional winding temperature measuring device and its operation will be explained. First, put a vertical spacer (4a) on the insulation cylinder (3a).
Glue. After that, the winding is wound sequentially from the inside, a sensor spacer (7) and a light temperature sensor (5) are inserted in the middle of one winding layer, and the winding is further wound to the outermost layer to form a single layer of winding. A line layer (1) is formed.

Next, the insulating spacer (2) is attached to the vertical spacer (4a) and the next layer of winding is wound, during this time the optical fiber (6)
After forming a zero winding layer that is wound circularly and fixed to the winding (1), a vertical spacer (4b) and an insulating tube (3b) are attached, and the optical fiber (6) is connected to the winding (1). The light temperature sensor (5), which is drawn out through the insulating cylinder (3b), is connected to the winding (
1), it is in direct contact with the winding wa layer (1), and the temperature of the winding can be measured.

Optical temperature sensors utilize the phenomenon that the optical absorption edge wavelength of semiconductors such as GaAs and CdTe shifts to longer wavelengths as the temperature rises. Focusing on the fact that the amount of transmitted light decreases as the temperature rises when the light enters the room, the temperature is measured by detecting the amount of transmitted light. Since the optical temperature sensor is connected to a light emitting section and a light receiving section (not shown) outside the transformer using only optical fibers, it is possible to directly measure the temperature of the high voltage winding. Furthermore, since this measurement method uses light, it is possible to measure temperature with high precision without being affected by the high electric and magnetic fields in the transformer. In addition, the winding temperature of a transformer is usually estimated by adding a correction to take into account the negative current by measuring the temperature of a cooling medium such as mineral oil or SFO gas with a thermometer attached to the transformer tank. By directly measuring the winding temperature, it is possible to improve measurement accuracy and eliminate time delays.

[Problems to be Solved by the Invention] Conventional winding temperature measuring devices require the optical temperature sensor to be inserted between the windings during the winding process, which makes it difficult to use for large power transformers. In this case, an optical fiber of 5 to 10 m is required to extend outside the transformer tank. A small-diameter optical fiber is easily broken, so there is a problem in that the drawn-out optical fiber reduces the efficiency of winding work.

In addition, since the portion of the optical temperature sensor that is not in contact with the winding (1) is exposed to the cooling medium of the winding such as mineral oil or SFa gas, there is a problem that the measured value is lower than the actual winding temperature. . This invention was made to solve the above-mentioned problems, and its purpose is to provide a winding temperature measuring device that can measure winding temperature with high accuracy without reducing the efficiency of winding work. do.

[Means for Solving the Problems] The winding temperature measuring device of the present invention includes inserting an optical temperature sensor into a recess formed in one of the surfaces of an insulating spacer inserted between the winding layers, which faces the winding layers. The exposed surface is brought into close contact with the 11th layer of the winding.

[Function] In the winding temperature measuring device of the present invention, the exposed surface of the optical temperature sensor is in close contact with the winding layer to be measured, so the temperature can be accurately detected, and the optical temperature sensor is connected after the winding is wound. can be inserted into the recess of the insulating spacer.

[Implementation 541 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 FIG.
3a) has a plurality of winding layers (
1) is wound, and an insulating spacer (2) is provided between each winding layer (1).A vertical spacer (4b) and an insulating cylinder ( 3b) are provided, and the winding layer (1) and the insulating spacer (2) are held by vertical spacers (4a) (4b). A recess (2a) corresponding to the shape of the optical temperature sensor is formed on one side of the insulating spacer for embedding the optical temperature sensor (5). In this embodiment, the recess (2a) is formed obliquely with respect to the diameter direction of the insulator (3b) so that the optical temperature sensor (5) can be easily inserted.

In addition, in order to detect the temperature of the hottest part of the winding, the recess (2a) is formed so that the tip, which is the temperature sensing part of the optical temperature sensor (5), is located at the center of the winding ff (1). has been done. Further, when the optical temperature sensor (5) is inserted into the recess (2a), the exposed surface of the optical temperature sensor (5) is substantially flush with the surface of the insulating spacer (2) in which the recess (2a) is formed. It is formed to be located at.

Next, a method of incorporating the winding temperature measuring device of the present invention will be explained. After adhering the vertical spacer (4a) to the insulating cylinder (3a), the winding is wound to form a part of the winding TI (1).The insulating spacer (2) is attached to the vertical spacer (4a). After the winding process of the 0th winding for winding the next layer of winding is completed, the 0th order vertical spacer (4b) is inserted into the recess (2a) provided in the insulating spacer (2) to insert the optical temperature sensor (5). ),
insulation! (3b) and wind the optical fiber (6) (
1) and the insulating cylinder (3b) and are pulled out to the outside and are tightened with strong pressure in the axial direction. As a result, the optical temperature sensor (5) embedded in the insulating spacer (2) is tightly fixed to the winding layer (1). Although the optical temperature sensor (5) is fixed only by pressure, it may be bonded when inserted into the insulating spacer (2).

As described above, in the winding temperature measuring device of the present invention,
There is no need to incorporate the optical temperature sensor (5) during winding work,
It can be assembled after winding is completed.

Therefore, there is no reduction in the efficiency of the winding operation, and there is no fear that the optical fiber will break during the winding operation.

In the winding temperature measuring device configured as above,
The optical temperature sensor (5) is embedded in the recess (2a) of the insulating spacer (2), and the exposed surface is in close contact with the winding N (1), so the optical temperature sensor (5)
A: Accurately measure the winding temperature without direct contact with the cooling medium, and
Measurements can be made without time delay.

In addition, in the above embodiment, since the temperature sensing part (tip) of the optical temperature sensor (5) is in close contact with the center part of the winding layer in the thickness direction, the temperature of the high temperature part of the winding can be detected with high precision and high sensitivity. can be measured.

Note that the temperature sensor may be housed in a protective container made of ceramic or the like.

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

Further, in the above embodiments, a sensor using the temperature characteristic of the optical absorption edge wavelength is used as the optical temperature sensor, but the present invention is not limited to this, and other types of sensors may be used.

[Effects of the Invention] As described above, according to the present invention, since the optical temperature sensor is embedded in the insulating spacer and is configured to be brought into close contact with the winding layer, the winding can be performed with high precision without being affected by the cooling medium. Moreover, since the optical temperature sensor can be incorporated after the winding work is completed, it is possible to obtain a winding temperature measuring device that does not reduce the efficiency of the winding work.

[Brief explanation of the drawing]

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. Note that the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] (1) An insulating spacer inserted between the winding layers and having a recess on one side facing the winding layer; a light temperature that is embedded in the recess of the insulating spacer and whose exposed surface comes into close contact with the winding layer; Winding temperature measuring device with sensor.