JPS60249061A - Instrument for automatic analysis of gas in oil - Google Patents

Abstract

PURPOSE:To eliminate the need for the man power required for analysis by storing the result of gas analysis, determining the deterioration with lapse of time and changing the sampling period of a process for drawing and analyzing oil from at least either one of a tendency to an increase or decrease and a specified value or above of the amt. of combustible gas. CONSTITUTION:An instrument 4 for automatic analysis of gas in oil takes a specified amt. of insulating oil 2 into a gas extracting part 8 through a oil drawing pipe 3 when a valve driving device 7 is started to open and close a valve 6 from a control part 5 at every specified period. The part 8 receives the start signal from the part 5, extracts the combustible gas in the insulating oil and feeds the same into a gas analyzing part 9. The part 9 receives the start signal from the part 5, analyzes the total amt. of the combustible gas or the amt. of specific several kinds of the combustible gases and transmits the same to a data processing part 10. The part 10 receives the start signal from the control part, stores the result of the analysis and determines the change thereof with lapse of time. Said part changes the sampling period of the process for drawing and analyzing the oil from at least either one of the tendency to the increase or decrease and the specified value or above of the amt. of the combustible gas. The need for the man power is thus eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] This invention relates to a data processing device, particularly a flammable The present invention relates to an automatic gas-in-oil analyzer that has a function of automatically changing the sampling period for oil extraction and analysis based on the increasing or decreasing tendency of the amount of gases.

[Prior art]

When an abnormality such as arc discharge, corona discharge, or local overheating occurs inside oil-filled equipment, electrically insulating materials such as insulating oil or insulating paper near the abnormality decompose and generate flammable gas. Most of this generated flammable gas is dissolved in the insulating oil. Therefore, combustible gas analysis in oil has traditionally been performed to detect abnormalities in oil-immersed equipment early and prevent accidents. Conventionally, the mainstream of equipment for detecting flammable gases in oil has been off-line processing, in which a person extracts oil from an oil-immersed device and analyzes the extracted oil using an analytical device such as gas chromatography. An online automatic analysis device that automatically performs everything from oil extraction to analysis has also been commercialized.

However, although both analyzers can detect the absolute value of the amount of flammable gas in oil, the tendency of increase in the amount of flammable gas in oil is important for early detection of abnormalities in oil-filled equipment. Otherwise, it is not possible to process the judgment of a decreasing trend, and the trend detection and abnormality judgment are all done manually.If it is determined that caution is required, the sampling period for oil sampling and analysis processing is shortened in order to make a more accurate judgment. The drawback was that it required a lot of manpower to do so.

[Summary of the invention]

In order to eliminate the drawbacks of the conventional flammable gas analyzer in oil, this invention automatically analyzes the amount of flammable gas in oil, determines its change over time, and then samples the increasing or decreasing trend of flammable gas in oil. The purpose is to provide an automatic gas-in-oil analyzer that has the function of changing the cycle.

[Embodiments of the invention]

Figure #g1 is a four-dimensional diagram showing an embodiment in which the present invention is applied to an oil-immersed transformer. , (3) is an oil-immersed transformer (
1) is the oil extraction pipe for taking insulating oil (K) to the gas extraction part of the automatic gas in oil analyzer (2), and (7) is the control part (
The valve driving device opens and closes the valve (6) according to the signals of the evening), the gas extraction part that takes in the insulating oil (ko) and extracts flammable gas from the oil, and the gas extraction part (ri).
The gas analyzer (/θ) takes in the combustible gas extracted at (2) and detects the amount of flammable gas. a data processing unit that determines the sampling period based on at least one of the increasing trend or decreasing trend of the combustible gas and the amount of flammable gas exceeding a certain value;
//) is a display section that displays data processing results, (/2) is an alarm output section, and (ri) to (lco) are operated in an appropriate order by a control section (!r). In the figure, the solid arrow line indicates the flow of the extracted combustible gas, and the dotted line indicates the first data flow.
The dashed-dotted lines each indicate the flow of control signals.

The automatic gas-in-oil analyzer configured as described in section 7 above (is a system in which the control section (j-) controls the pulp drive device (
7) and opens and closes the pulp (6), a certain amount of insulating oil (co) is taken into the gas extraction part (, r) through the oil extraction pipe (3). When the gas extraction section Ct) receives a start signal from the control section (3), it extracts flammable gas from the insulating oil, and sends the extracted flammable gas to the gas analysis section (9). When the gas analysis unit (te) receives the gas analysis start signal from the control unit (j), it transmits the total amount of combustible gas or C, H, (acetylene).
The amount of several types of specific combustible gases such as When the data processing unit (io) is activated, the data processing unit <i
o) Determines the increasing or decreasing tendency of the total amount of combustible gas or the amount of specific several kinds of combustible gases over a certain period of time from the latest data and several previous data that have already been stored. Thereafter, the data processing unit (10) calculates the sampling period based on at least one of this increasing trend or decreasing trend and the level of the gas amount. For example, as shown in FIG. 2, a short sampling period is calculated for an increasing trend or a high level, and a long sampling period is calculated for a decreasing trend or a low level. The calculation results are displayed on the display (//)
The calculated sampling period and processing completion signal are output to the control unit (&).The display unit (//) is the control unit (&).
When it receives an output signal, it displays the calculation processing result, and the alarm output section (l controller) receives a signal from the control section (event) indicating that there is an abnormality sign and outputs an alarm such as a contact output.
, the control unit (3) starts the next operation under the modified sampling period.

In the above example, the sampling period was determined by focusing on the increasing or decreasing trend of the total amount of flammable gas in oil or the amount of several specific types of combustible gas, but the amount of flammable gas is very small. In this case, taking into account that gas analysis accuracy is generally poor, a data processing unit that determines the sampling period, etc. based on the increasing tendency or decreasing tendency of the flammable gas amount only when the flammable gas amount is above a certain value. By doing so, it is possible to prevent erroneous judgments when the amount of flammable gas is small.

〔Effect of the invention〕

As explained above, this invention is a device that automatically analyzes the amount of flammable gas dissolved in the oil of oil-immersed equipment, stores the amount of flammable gas, and stores several analysis results (the amount of flammable gas). It has a function that statistically processes data to automatically detect increasing and decreasing trends in the amount of combustible gas, and automatically changes the sampling period based on this, eliminating the manual labor that was previously required for data processing and determining the presence of abnormal symptoms. Not only is it unnecessary, but
This has the effect of reducing the amount of manpower and associated costs required when the sampling period is short.

[Brief explanation of drawings]

FIG. 7 is a block diagram showing an embodiment of an automatic gas-in-oil analyzer according to the present invention, and FIG. 2 is a waveform diagram showing an example of sampling time with respect to temporal changes in the amount of combustible gas in oil. In the figure, (1) is an oil-immersed transformer, (c) is insulating oil, (
3) is oil extraction piping, (ri is gas in oil automatic analyzer, (11)
) is the control unit, (6) is the valve, (7) is the valve drive device, CI> is the gas extraction unit, (wa) is the gas analysis unit, (10)
indicates a data processing section, (l/) indicates a display section, and (/λ) indicates an alarm output section. In each figure, the same reference numerals indicate the same or corresponding parts. 1 picture of flame (2 picture of coin)

Claims (1)

[Claims] (1) A gas extraction section that takes in a small amount of oil from oil-filled equipment and extracts the flammable gas contained in this oil, and a gas extraction section that takes in the flammable gas extracted by this gas extraction section and extracts the total amount or specific amount of combustible gas. In an apparatus equipped with a gas analysis section that analyzes the amounts of several types of combustible gases, the results analyzed by the gas analysis section are stored, their changes over time are measured, and the increasing or decreasing tendency and flammability above a certain value are determined. 1. An automatic gas-in-oil analyzer, comprising a data processing section that automatically changes the sampling period of oil extraction and analysis based on at least one of the amount of gas and the amount of gas.