JPH02103910A - Sulfurating corrosion diagnosis device for oil-filled electric apparatus - Google Patents

Abstract

PURPOSE:To prevent insulation breakage by sulfurating corrosion by providing a sample storage box so that insulating oil in a tank may circulate, and storing a conductor sample mainly composed of the same metal as the conductor of an equipment main body in this box. CONSTITUTION:An equipment main body 2 is fixed in a tank 1, and insulating oil 3 is filled in the tank 1. Valves 4a and 4b are provided at the upper and lower parts of the tank 1, and a sample storage box 7 is fixed to the valves 4a and 4b through oil introduction pipes 5a and 5b. In this box 7 is stored a conductor sample mainly composed of the same metal as a conductor. Accordingly, by monitoring the conductor sample inside the box 7 the sulfurating corrosion of the main body 2 can be diagnosed. Hereby, the advancement degree of the sulfurating corrosion can be monitored, and insulation breakage by sulfurating corrosion can be prevented.

Description

[Detailed Description of the Invention] [Purpose of the Invention (Industrial Application Field) The present invention is directed to the sulfurization of conductors made of steel, silver, etc. using active sulfur components present in insulating oil, which is an insulating medium for oil-filled electrical equipment. This invention relates to a sulfide corrosion diagnostic device for oil-filled electrical equipment that diagnoses the degree of corrosion progress.

(Prior art) Oil-filled electrical equipment such as transformers and reactors contains insulating oil in a tank along with the equipment body to maintain insulation of the equipment.
I'm doing it. Therefore, the conductor parts of the main body of the device, such as current-carrying leads and switching contacts for switching voltage, current, etc., are not used in insulating oil.

There are parts of the conductor whose surface is bare and in direct contact with the insulating oil, whose main component is steel or silver. Since this insulating oil is an organic substance, it naturally contains various components such as nitrogen and sulfur in addition to main components such as carbon, hydrogen, and oxygen. These main components generally do not react with the metals that make up the conductor, such as copper and silver.
Shows stable insulation properties over a long period of time.

However, it is known that some components having an organic chemical structure are present in the sulfur component, and this reacts with copper, silver, etc. and causes sulfide corrosion in the conductor. This sulfide corrosion produces substances such as sulfide steel and silver sulfide on the surface of the conductor. These produced substances not only have good electrical conductivity, but also have physical softness, vibration, and
External forces such as oil flow may cause copper, silver, etc. to peel off from the surface of the conductor and float in the insulating oil.

(Problems to be Solved by the Invention) Needless to say, if such chemical products with good conductivity are suspended in an insulating oil that is expected to have high insulating properties, the insulating performance of the insulating oil will be significantly reduced. In fact, many cases have been reported in which these phenomena caused dielectric breakdown in oil-filled single-gas equipment, resulting in major accidents. (For example, reported in Denki Tetsu Tsuzume, published in May 1980, Vo 134, Mu 5.) Therefore, various methods to prevent accidents caused by such sulfide corrosion have been researched and reflected in equipment. However, there are still no sufficient methods to monitor the progress of sulfurization inside equipment.

In view of the above points, the present invention aims to monitor from the outside the sulfide corrosion phenomenon progressing within oil-filled electrical equipment,
An object of the present invention is to provide a sulfide corrosion diagnostic device for oil-filled electrical equipment that prevents dielectric breakdown due to sulfide corrosion and improves the reliability of the equipment.

[Structure of the Invention] (Assignment and Means for Solving the Problems) In order to achieve the above object, the present invention provides an electric device in which a tank is filled with insulating oil together with the device body, in which the insulating oil in the tank is filled with insulating oil. A sample storage box is provided so as to circulate, and a conductor sample whose main component is the same metal as the conductor of the main body of the device is stored in the sample storage box.

(Function) In this way, the conductor sample in the storage box will have the same conditions for sulfide corrosion as the conductor in the equipment body in the storage box, and by monitoring the conductor sandals, sulfide corrosion in the equipment body can be prevented. progress can be monitored.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a device main body 2 consisting of an iron core and a coil wound around the iron core is fixed in a tank 1, and the tank 1 is further filled with insulating oil 3. tank 1
Pulp 4m and 4b are provided at the upper and lower parts as oil intake ports, and an oil guide/dead 5 is provided in the pulps 4h and 4b.
A Sisander storage box 7 is fixed to Franz 6h and 6b via m and 5b. This sample storage box 7 stores therein conductor sandals having the same properties or the same main components as the conductor or voltage/current switching contact used in the main body 2 of the device, the main component being copper or silver. The sample storage box 7 is provided with a monitoring window 8 made of transparent glass or the like so that the conductor samples stored therein can be viewed directly. One monitoring window 8 or a plurality of monitoring windows 8 may be provided to let in light, but all monitoring windows 8 are covered with a cover that can be rolled up and opened to block sunlight at all times.

With this configuration, the insulating oil 3 in the tank 1 is constantly circulated also in the sample storage box 7 via the oil guide/9i f5*, 5bf, and the insulating oil 3 in the tank For a conductor sample whose main component is copper or silver, the conditions for sulfide corrosion are almost the same as for the conductor portion of the equipment body in the tank 1.

Therefore, the conductor sample in the sample storage box 7 can be monitored through the entire monitoring window 8 when necessary, and if necessary, the conductor sample can be taken out and analyzed in the laboratory.
It is possible to diagnose sulfide corrosion with high accuracy. This makes it possible to prevent dielectric breakdown accidents due to sulfide corrosion by monitoring the progress of sulfide corrosion.

The sample storage box 7 can be opened and closed by controlling the upper and lower pulps 4a and 4b of the sample storage box so that it can be removed from the tank 1 without draining the oil in the tank 1. Further, the conductor sandals stored in the sample storage box 7 can be taken out from inside when necessary, regardless of whether or not the sample storage box 7 is removed from the tank 1. Furthermore, the temperature inside the sample storage box 7 can be controlled by providing a heater on the outer periphery or inside the sample storage box 7 in order to change the temperature with the oil-filled equipment and accelerate the sulfidation corrosion phenomenon inside.

[Effects of the Invention] As described above, according to the present invention, in an oil-filled electrical device in which a tank is filled with insulating oil together with the device body, a sample storage box is provided so that the insulating oil in the tank is circulated, and this A conductor sample whose main component is the same metal as the conductor of the equipment main body is stored in the sample storage box, and by monitoring this conductor sample, the progress of sulfide corrosion on the equipment main body can be monitored. It is possible to obtain a sulfide corrosion diagnostic device for oil-filled electrical equipment that prevents dielectric breakdown and improves the reliability of the equipment.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention. 1...Tank, 2...Equipment body, 3...Insulating oil,
4a. 4b... Valve, 5a, 5b... Oil guide pipe, 7.
...Sample storage box, 8...Monitoring window. Applicant's Representative Patent Attorney Takehiko Suzue

Claims (1)

[Claims] In oil-filled electrical equipment in which a tank is filled with insulating oil along with the equipment body, a sample storage box is provided so that the insulating oil in the tank circulates, and a sample containing the same metal as the main component of the conductor of the equipment body is placed inside the sample storage box. A sulfide corrosion diagnostic device for oil-immersed electrical equipment that stores a conductor sample and monitors the progress of sulfide corrosion on the equipment body by monitoring the conductor sample.