JPS6058563A - Oil-filled electrical equipment - Google Patents

Abstract

PURPOSE:To attain to enhance the operation reliability of oil-filled electric machinery by making it possible to diagnose the residual life of said electric machinery during operation, by mounting a temp. detecting means, an oxygen concn. detecting means, a memory means of detection output, a memory means for storing deterioration characteristics of an insulating material and an operation means for calculating residual life. CONSTITUTION:Converter apparatuses 10A, 10B and data memory apparatuses 11A, 11B are operated at every definite period during the operation of a transformer 1 by the control of a central control part 17 while the outputs from a measuring instrument 8 for measuring dissolved oxygen in oil and a operation temp. measuring instrument 9 are extracted as electrical signals and successively stored in the respectively corresponding data memory apparatuses 11A, 11B. In this case, these memory data are read at every certain period and imparted to a comparing operating apparatus 12. Whereupon, the comparing operating apparatus 12 calculates an oxygen concn. change amount from said read and calculated data and further compares this oxygen concn. change amount on the basis of the data stored in an experimental data memory apparatus 13 and an oxygen transmission data memory apparatus 14 to calculate residual life due to the deterioration of an insulating material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to oil-immersed electrical equipment that enables prediction and diagnosis of the lifespan of insulating materials.

[Technical background and problems of the invention]

In recent years, high-voltage, large-capacity power transmission has been carried out due to an increase in demand for electric power, and as a result, oil-filled electrical equipment such as transformers have been made to have higher voltages and larger capacities. Therefore, the reliability of transformers and the like, which are the core equipment for large-capacity power transmission, is required to be more reliable than ever before, and there is a demand for the development of protective diagnostic technology that can detect internal abnormalities at an early stage.

At the same time, unmanned substations and other facilities are being promoted, and from this perspective, there has been a desire to develop technologies for highly reliable maintenance, inspection, protection, and life expectancy of equipment.

In response to this, progress has been made in the development of automatic detection devices for internal partial discharges and technologies for measuring dissolved decomposed gases in oil, which can quickly detect internal abnormalities after they occur and prevent the abnormality from expanding. It is now possible to do so.

However, all of these techniques detect a phenomenon after an internal abnormality has occurred and confirm the abnormality, and are not techniques for predicting the occurrence of future abnormalities.

In other words, until now there has been no means of predicting the remaining life of insulating materials such as insulating oil and insulating paper in oil-filled electrical equipment in operation.
However, the lifespan could only be determined after some kind of abnormality or eventual accident occurred. Insulating materials deteriorate in various ways depending on the operating conditions of the equipment, and until now it has been extremely difficult to measure the remaining life of each equipment. In some cases, the remaining life was determined by measuring each characteristic.

However, in the past, it was impossible to apply this method to all devices, and even if this method were used, the time and expense required could not be ignored, and furthermore, the portions that could be sampled were limited to only a few. Therefore, the evaluation was limited to the average degree of deterioration and remaining life diagnosis.

In addition to this situation, overload operation is frequently performed these days, and it is desired to establish a technique for quantitatively measuring the reduction in life due to overload.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide oil-filled electrical equipment that can diagnose the remaining life of oil-filled electrical equipment during operation, thereby improving operational reliability. The purpose is to

[Summary of the invention]

That is, in order to achieve the above object, the unexploded EA is an oil-filled electrical device that is sealed with insulating oil. an oxygen concentration detection means provided in the incoming electrical equipment for detecting the in-oil oxygen U degree of the insulating oil; a means for storing the detection outputs of the two detection means every predetermined period; means for storing the magnitude of oxygen consumption when the operating temperature is constant and the deterioration characteristics of the insulating material due to the operating temperature when the oxygen consumption is constant, and the oxygen concentration based on the data obtained from the storage means for the detection output. The system includes a calculation means for calculating the amount of change and calculating the remaining life of the insulating material by comparing this amount of change with the deterioration characteristics, and a means for displaying this remaining life, and a means for displaying the remaining life of the insulating material. Detection data is collected regularly, and from this, the change meter of the oxygen level in the insulating oil is monitored, and the remaining life of the insulating material is determined from the relationship between the operating temperature, oxygen consumption, and material properties obtained in advance. To make it possible to know the remaining life in advance by displaying the information, thereby improving operational reliability.

[Embodiments of the invention]

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

The present invention focuses on the fact that insulating materials such as insulating oil and insulating paper deteriorate due to a bonding reaction with oxygen in the oil at a certain operating temperature. The aim is to periodically measure and record deterioration based on the amount of change in oxygen concentration and the actual measured value of operating temperature, and compare it with various experimental data to calculate the remaining life of the insulating material. In order to increase the accuracy of calculating the remaining life, it is also possible to calculate the remaining life for each part of the device by taking into account the amount of oxygen permeation from the conservator and increasing the number of temperature measurement points.

FIG. 1 is a diagram showing the configuration of this device, and shows an oil-filled transformer 1 as a representative oil-filled electrical device. This transformer 1 has an iron core 4 and a winding 3 inside, and is filled with insulating oil 5.

In high-voltage transformers, the amount of moisture and gas in the insulating oil is controlled, and the conservator 6 installed in the main voltage transformer is separated from the outside air with nitrogen, or separated from the outside air with a rubber membrane. Shapes are used.

The transformer 1 is provided with an in-oil dissolved oxygen concentration measuring device 8 that measures the dissolved oxygen concentration in the internal insulating oil 5 and an operating temperature measuring device 9 that detects the temperature of the insulating oil. A conversion device R10h that converts the measurement results into electrical signals,
1oB is connected. In addition, each conversion device 1
0AJOB is provided with data storage devices 11A, .

In addition, the comparison calculation device 12 includes an oxygen permeation data storage device 14 that stores predetermined oxygen permeation amount data from the conservator 6 and packing, and experimentally stores insulation deterioration data at various temperatures and oxygen concentrations. Data is provided from the experimental data storage device 13 which was recently stored (for example, in FIG. 2). The comparison calculation device 12 receives the oxygen degree d in oil and the operating temperature measured at each certain period during the operation of the transformer l, performs processing at each certain period, and calculates the amount of change in the oxygen performance. At this time, data on the amount of oxygen permeated from the conservator, packing, etc. is referenced, and the remaining life is calculated by comparing it with experimental data on insulation material deterioration at various temperatures and under oxygen conditions. Reference numeral 15 designates a display unit that displays the results of this calculation, reference numeral 16 designates a warning generation unit that issues an alarm in response to the calculation result, and reference numeral 17 designates a central control unit that controls the entire system.

This device with such a configuration is configured to convert converters lθA, 70B1, data storage devices 11A, IIB under the control of the central control unit 17 at regular intervals during operation of the transformer l.
is activated, the outputs of the dissolved oxygen concentration in oil measuring device 8 and the operating temperature measuring device 9 are extracted as electrical signals, and are sequentially stored in the corresponding data storage device 11 in the JIB. This stored data is then read out every certain period and given to the comparator 1.2. Then, the comparator R12 determines the amount of change in oxygen concentration based on the read and given data, and further calculates the amount of change in oxygen concentration based on the data stored in the experimental data storage device I3 and the oxygen permeation data storage device 14. The remaining life due to deterioration of the insulating material can be seen by comparing. The determined results are displayed on the display section 15 and, if necessary, are alerted by the warning transmitting section 16.

In this way, the degree of deterioration of the insulating material corresponding to the past operating history of the oil-filled electrical equipment, that is, the degree of deterioration of each property such as the tensile strength and dielectric strength of the insulating material, is determined by changes in the oxygen concentration in the oil, and vice versa. The remaining life, that is, the remaining life can be determined and displayed. Of course, the remaining life will always change little by little due to overload operation and subsequent operation, so with the present invention, it is possible to measure the oxygen concentration in each town for a certain period of time and determine the remaining life from the results for each certain period. This makes it possible to issue a warning before an abnormality occurs or the end of the lifespan, ensuring highly reliable equipment operation.

Furthermore, instead of relying on a representative temperature measurement, for example, by constantly measuring the temperature inside the windings using an optical fiber and also measuring the temperature of other parts, it is possible to judge the deterioration of each part, that is, calculate the remaining life. becomes.

It should be noted that the present invention is not limited to the present invention, and can be carried out with appropriate modifications within the scope of the gist; for example, in the above example, oil Although an oil-filled pressure relief device is shown as an example of the input electrical equipment, it can also be implemented for other equipment.

Further, the method of measuring oxygen concentration itself is not limited here, and detection may be performed using gas chromatography or a separation membrane.

〔Effect of the invention〕

As detailed above, according to the present invention, it is possible to know the state of deterioration of insulating materials, and to diagnose the remaining life of oil-filled electrical equipment in operation, thereby significantly improving operational reliability by 1c. We can provide oil-filled electrical equipment that can

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing an example of the relationship between operating temperature, oxygen consumption, and material properties used for determining remaining life. DESCRIPTION OF SYMBOLS 1...Oil-immersed transformer, 5...Insulating oil, 8...Dissolved oxygen concentration measuring device in oil, 9...Operating temperature side boiler, 10A. lOR...Magyo Taketo 11 A 11 D---1) V-shell storage device, 12... Comparison calculation device, 13... Experimental data storage device, 14... Oxygen permeation data storage device, 1
5...Display section, 16...Warning transmitting section, 17...Central control section.

Claims (1)

[Claims] In an oil-filled electrical device in which insulating oil is sealed, a temperature detection means provided in the oil-filled electrical device to detect the temperature of the insulating oil, and a temperature detection means provided in the oil-filled electrical device to detect the oxygen concentration in the insulating oil. means for storing the detection outputs of these rain detecting means for each predetermined period; and a means for storing the detection outputs of these rain detecting means at predetermined intervals, and the magnitude of the oxygen consumption when the operating temperature of the equipment is constant and the operating temperature when the oxygen consumption is constant, which are obtained in advance. means for storing the deterioration characteristics of the insulating material due to the deterioration of the insulating material, and calculating the amount of change in oxygen concentration based on the data obtained from the storage means for the detection output, and calculating the remaining life of the insulating material by comparing this amount of change with the deterioration characteristics. An oil-filled electrical device characterized by comprising a calculation means for determining the calculated remaining life and a means for displaying the calculated remaining life.