JPH0974018A - Immersed transformer with monitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to install another dial thermometer, etc., without making a hole in a cover and welding a thermometer mounting seat by combining a temperature monitor which monitors the temperature of insulation oil, a fuel level monitor which monitors the position of the fuel level of the insulation oil, and a bursting mechanism which lets pressure go when an abnormal pressure appears in a tank as an integral unit. SOLUTION: A bursting mechanism is constituted of a bursting section 12 which closes an opening at normal occasions but lets pressure go when an abnormal pressure appears by forming a space between the opening and itself. A temperature monitor is constituted of a temperature displaying section 3 which, installed outside a cylinder section 8 and connected to a temperature information transmitting section 2, displays the temperature of insulation oil 27. A fuel level monitor is constituted of a float 22 which is floated on the fuel level of the insulation oil 27, a fuel level position transmitting section which transmits the movement of the float 22, and a fuel level displaying section 19 which displays the position of the fuel level. The temperature monitor, the fuel level monitor, and the bursting mechanism are combined as an integral unit and are installed in a hole 4 for installing the monitors which is made in an immersed transformer cover 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an oil-filled transformer,
The present invention relates to an oil-filled transformer having a monitoring device suitable for monitoring insulating oil temperature and oil surface position in an oil-filled transformer and releasing pressure when abnormal pressure occurs in a tank.

[0002]

2. Description of the Related Art In a conventional oil-filled transformer with a monitoring device, as shown in FIG. 4, a rod-shaped thermometer monitors oil temperature and a floating body having a hole in the center floating on an insulating oil surface guides a rod-shaped alcohol thermometer. The transformer cover is equipped with a monitoring device that allows the oil level position to be monitored by moving the indicator rod that moves up and down, and that is directly connected to it, and that has a pressure release mechanism that releases pressure when abnormal pressure in the tank is integrated into one case. It is installed in the open hole. Further, when a dial thermometer or an oil-immersed transformer with a resistance temperature detector was requested by the customer, a hole was additionally processed in the cover and the thermometer mounting seat was welded and mounted. As a related one
-71721 is mentioned.

[0003]

For an oil-filled transformer which can monitor the temperature of the insulating oil in the oil-filled transformer and the oil surface position, and which requires a pressure relief mechanism for releasing the pressure when abnormal pressure occurs in the tank. If it is necessary to install a dial thermometer or resistance thermometer separately from these, a dial thermometer or resistance thermometer that can be installed without additional machining of a hole in the cover and welding of the thermometer mounting seat To obtain an oil-filled transformer with a body.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a tank having an upper cover and filled with insulating oil, a transformer main body housed in the tank, and an insulating body. A temperature monitoring device that monitors the temperature of oil, an oil surface monitoring device that monitors the oil surface position of insulating oil, and an oil-filled transformer with a monitoring device that has a pressure release mechanism that releases the pressure when abnormal pressure in the tank occurs, The pressure relief mechanism has a cylindrical portion having one end fixed to the cover and communicating with the inside of the tank, the other end having an opening and an airtightly formed display window on the side surface, and the other end of the cylindrical portion elastically. The temperature monitoring device is formed in the shape of a rod and is formed into a rod shape to hold the opening and normally closes the opening and forms a gap between the opening and the opening when an abnormal pressure occurs to release the pressure. And the tip is located inside the insulating oil, and the information on the temperature of the insulating oil is displayed. It consists of a temperature information transmission unit and a temperature display unit that is provided outside the cylinder and connected to the temperature information transmission unit to display the temperature of the insulating oil, and slides the oil level monitoring device along the temperature information transmission unit. A floating body that is movably provided and floats on the oil surface of the insulating oil, an oil level position transmitting section that has one end connected to the floating body and the other end extends into the cylindrical section, and transmits the movement of the floating body, and this oil level position transmitting section. It is achieved by integrating the temperature monitoring device, the oil level monitoring device, and the pressure release mechanism, which is connected to the other end of the cylinder part and is configured by an oil level display part for displaying the oil level position in the display window of the cylinder part. .

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention is shown in FIG. The transformer of this embodiment has a cover 1 on the upper side, and a tank (not shown) filled with insulating oil 27 inside and a transformer body (not shown) housed in this tank are insulated from each other. Oil-filled transformer with a monitoring device for monitoring the temperature of the oil 27, an oil level monitoring device for monitoring the oil level position of the insulating oil 27, and a pressure release mechanism for releasing the pressure when abnormal pressure occurs in the tank. Is.

The pressure release mechanism has a cylindrical portion 8 having one end fixed to the cover 1 and communicating with the inside of the tank, and an opening portion at the other end, and a display window 16 airtightly formed on the side surface, and the cylindrical portion 8. It is constituted by a pressure releasing portion 12 which is elastically held at the other end of the opening and normally closes the opening portion and forms a gap between the opening portion and the opening portion when an abnormal pressure occurs to release the pressure.

The temperature monitoring device includes a temperature information transmitting portion 2 which is formed in a rod shape and penetrates the pressure release portion 12 and the cylindrical portion 8 and has a tip located in the insulating oil 27 and transmitting information on the temperature of the insulating oil 27. ,
The temperature display unit 3 is provided outside the cylindrical unit 8 and is connected to the temperature information transmission unit 2 to display the temperature of the insulating oil 27.

The oil level monitoring device is provided so as to be slidable along the temperature information transmitting section 2 and floats on the oil surface of the insulating oil 27, and one end is connected to the floating body 22 and the other end is inside the cylindrical section 8. An oil level position transmitting portion that extends and transmits the movement of the floating body 22, and an oil level displaying portion 19 that is connected to the other end of the oil level position transmitting portion and displays the oil level position in the display window 16 of the tubular portion 8. It is composed of The temperature monitoring device, the oil level monitoring device, and the pressure release mechanism are integrally formed, and are attached to the holes 4 for mounting the monitoring device opened in the oil-filled transformer cover 1. In this embodiment, the temperature monitoring device is a dial thermometer in which a rod-shaped temperature sensing unit 2 as a temperature information transmitting unit and a temperature indicating unit 3 as a temperature display unit are directly connected. The oil-filled transformer cover 1 has a hole 4 for mounting the monitoring device, and the mounting seat surface 5
Is squeezed out from the upper surface of the cover 1 by several millimeters. Mounting seat surface 5
A stud bolt 7 for fixing the monitoring device mounting bracket 6 to which the dial thermometer is mounted is welded around the. Lower case 9 of monitoring device with dial thermometer
Is inserted into the hole 4 of the mounting seat surface 5 of the cover 1 via the gasket 10, the mounting metal fitting 6 is covered, and then the nut 11 is mounted and tightened on the stud bolt 7.

At the upper end bent portion of the upper case 8 as a cylindrical portion, a pressure release lid 12 as a pressure release portion for releasing pressure when an abnormal pressure inside the oil-filled transformer is generated is attached via an O-ring 30. The upper case 8 and the pressure release lid 12 are fixed by the pressure release lid 1
2 and the upper case 8 upper end bent portion, a hole is formed in advance so that the diameter of the rod-shaped temperature sensing portion 2 of the dial thermometer can be inserted thereinto.
The rod-shaped temperature sensitive portion 2 is attached to the pressure release lid 12 so as to be at a right angle, and airtightly welded. A threaded portion 15 is preliminarily cut near the pressure release lid 12 of the rod-shaped temperature sensitive portion 2 so that the pressure regulating spring 13 can be attached by the pressure regulating nut 14. The rod-shaped temperature sensing portion 2 is inserted into the hole of the bent portion of the upper case 8 through the O-ring 13.
The pressure regulating spring 13 and the pressure regulating nut 14 from the back surface of the upper case 8 through the rod-shaped temperature sensing portion 2, and the pressure regulating nut 14 is rotated so that the rod-shaped temperature sensing portion 2 operates at an appropriate pressure. Fix it. The rod-shaped temperature sensitive portion 2 is formed of a metal having excellent thermal conductivity such as copper or aluminum, or a good conductor of heat such as a heat pipe.

An oil level monitoring window 16 as a display window is opened in the upper case 8, a transparent cylinder 17 for keeping airtightness is inserted into the upper case 8 through a gasket 18, and then an oil level indicator as an oil level display portion is displayed. A flat plate 20 having a hole through which the diameter of the rod 19 and the rod-shaped temperature sensing portion 2 passes, and the lower case 9 are attached, and the rivet 2 is attached.
Fasten with 1. Between the portion of the oil level indicator rod 19 located in the oil level monitoring window 16 and the floating body 22 in the tank, one end is connected to the floating body 22 and the other end extends into the tubular portion 8 to move the floating body 22. An oil level position transmission unit for transmitting is provided. In this embodiment, the oil level position transmitting portion is formed by a part of the oil level indicator rod 19. In the holes of the rod-shaped temperature sensing section 2 and the flat plate 20,
An oil level indicator rod 19 having an O-ring tip is inserted, and a floating member 22 having a hole at the center is attached to the other end of the oil level indicator rod 19 through the rod-shaped temperature sensing part 2. deep.

A second embodiment of the present invention is shown in FIG. In this embodiment, the direct attachment type dial thermometer of the first embodiment is replaced with a remote display type dial thermometer in which a rod-shaped temperature sensing part 2 and a temperature indicating part 3 are connected by a flexible pipe 23. It is a thing. Also in this embodiment, the rod-shaped temperature sensing unit 2 and the flexible pipe 2
3 is composed of a good heat conductor similar to that of the first embodiment.

A third embodiment of the present invention is shown in FIG. In this embodiment, the directly attached dial thermometer of the first embodiment has a rod-shaped temperature sensing unit 2 for converting a temperature into an electric quantity and a remote monitoring terminal unit 24.
The lead wire 29 is pulled out from the terminal portion 24 and connected to the remote monitoring device 28 for monitoring. In this embodiment, a temperature measuring resistor is used for the rod-shaped temperature sensing unit 2, and the temperature is detected and transmitted as a change in electric resistance. As the amount of electricity, an electric resistance value, a voltage or an electromotive force, an electric current, or the like is measured, and the temperature corresponding to these is displayed by the display means. As a sensor, in the case of electric resistance value, current, voltage, resistance temperature detector,
A thermistor or the like is used, and in the case of voltage or electromotive force, a thermocouple or the like is used. Other than the above, a semiconductor such as an infrared phototransistor may be used.

According to the above-described embodiment, the conventional insulating oil-oil temperature and oil-oil position of the oil-filled transformer shown in FIG. 4 can be monitored, and a pressure relief mechanism for releasing the pressure when an abnormal pressure in the tank occurs is provided. In an oil-filled transformer that requires an integrated monitoring device, even if an oil-filled transformer that requires a dial thermometer or resistance temperature detector to be installed separately from the oil-filled transformer, as shown in FIG. Since it is not necessary to form a hole and weld the thermometer mounting seat 25 to mount a dial thermometer or a resistance temperature detector, it is economical and the construction period can be shortened. In addition, after delivery of the oil-filled transformer, there is an advantage that it can be easily modified into a dial thermometer or an oil-filled transformer with a resistance thermometer by on-site modification.

Further, in the structure of the conventional product shown in FIG. 4, since the lower case 9 surrounds the rod-shaped alcohol thermometer 26, even if the insulating oil 27 is convected during the operation of the oil-filled transformer, the lower case 9 can be used.
It was difficult to measure the insulating oil temperature accurately because the insulating oil 27 stopped in the space surrounded by, but in the embodiment, since the rod-shaped temperature sensing part 2 is not surrounded by the lower case 9, the measurement accuracy is It is possible to improve.

[0015]

According to the present invention, there are provided a temperature monitoring device for monitoring the temperature of insulating oil, an oil surface monitoring device for monitoring the oil surface position of insulating oil, and a pressure release mechanism for releasing the pressure when an abnormal pressure in the tank occurs. Since it is integrated, it is possible to easily modify even if the specifications of the temperature monitoring device are different, and since the temperature display part and the oil level display part are independent, a monitoring device that can prevent misreading of the display An oil-immersed transformer can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main configuration of an oil-filled transformer with a monitoring device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a main configuration of an oil-filled transformer with a monitoring device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a main configuration of an oil-filled transformer with a monitoring device according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a configuration of a main part of a conventional oil-immersed transformer with a monitoring device.

FIG. 5 is a perspective view showing a mounting state of a conventional monitoring device and a dial thermometer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transformer cover, 2 ... Bar temperature sensing part, 3 ... Temperature indicating part, 4 ... Hole, 5 ... Mounting seat surface, 6 ... Mounting bracket, 7 ... Stud bolt, 8 ... Upper case, 9 ... Lower case, 10 ... Gasket, 11 ... Nut, 12 ... Pressure release lid, 13 ... Pressure adjusting spring, 14 ... Pressure adjusting nut, 15 ... Screw part, 16 ... Monitoring window,
17 ... Transparent tube, 18 ... Gasket, 19 ... Oil level indicator rod,
20 ... Flat plate, 21 ... Rivet, 22 ... Floating body, 23 ... Flexible pipe, 24 ... Terminal part, 25 ... Mounting seat 26 ... Rod thermometer, 27 ... Insulating oil, 28 ... Transparent monitoring equipment, 29 ... Lead wire, 30 … O-ring

Claims (3)

[Claims] 1. A tank having an upper cover and filled with insulating oil, a transformer main body stored in the tank, a temperature monitoring device for monitoring the temperature of the insulating oil, and the insulation. In an oil-filled transformer with a monitoring device that monitors the oil surface position of oil and a pressure relief mechanism that releases pressure when abnormal pressure in the tank occurs, one end of the pressure relief mechanism is fixed to the cover. And a cylindrical portion having an opening at the other end and communicating with the inside of the tank and having a display window airtightly formed on the side surface, and the other end of the cylindrical portion elastically held to normally open the opening. The temperature monitoring device has a pressure releasing portion that closes and releases a pressure by forming a gap between the opening portion and the opening portion when an abnormal pressure is generated. Is located in the insulating oil and transmits temperature information of the insulating oil. A transmission unit and a temperature display unit that is provided outside the tubular unit and is connected to the temperature information transmission unit to display the temperature of the insulating oil, and the oil level monitoring device follows the temperature information transmission unit. A floating body that is slidably provided and floats on the oil surface of the insulating oil; an oil surface position transmitting portion that has one end connected to the floating body and the other end that extends into the cylindrical portion to transmit the movement of the floating body; An oil-filled transformer with a monitoring device, comprising an oil level display section connected to the other end of the oil level position transmission section and displaying the oil level position in the display window of the tubular section. 2. The monitoring device according to claim 1, wherein the temperature information transmission section is formed of a good conductor of heat and is configured to transmit the temperature of the insulating oil as heat to the temperature display section. Oil-filled transformer. 3. The temperature information transmission unit has means for converting the temperature into an electric quantity, and is configured to transmit the temperature of the insulating oil as an electric quantity to the temperature display section. The oil-filled transformer with the monitoring device described in 1.