JP6243150B2 - Conservator shield deterioration diagnosis method - Google Patents

Description

  The present invention relates to a shield (oil-resistant and elastic, highly airtight resin bag or film) used to block contact between air and insulating oil in a sealed conservator for oil-filled electrical equipment. The present invention relates to a diagnostic method for diagnosing whether or not to replace a conservator film by estimating the deterioration state of a conservator shield (hereinafter referred to as a film) before deterioration or cracks or perforations occur.

  The film made of oil-resistant rubber, etc. provided in the conservator is damaged (breached, perforated, etc.) over time by repeating the vertical movement following the expansion and contraction of the insulating oil due to the operation of the oil-filled electrical equipment. ) When the membrane of the conservator is damaged and the insulating oil comes into contact with oxygen in the air, the total acid value of the insulating oil increases and discoloration progresses. Thus, as a means for detecting membrane breakage, there is a method of measuring the total acid value and / or color of sample oil collected from an oil-filled electrical device. (See Patent Document 1).

Further, as another means for detecting the breakage of the film, there is a method of measuring the oxygen concentration and / or the nitrogen concentration in the insulating oil collected from the oil-filled transformer or the conservator. (See Patent Document 2)

Furthermore, as another means of detecting the breakage of the membrane, it is possible to use an oil level gauge that displays the displacement of the oil level of the insulating oil in the transformer via a connecting member that expands and contracts as the membrane of the conservator moves up and down. is there. In this case, a float that moves up and down along the metal fitting fixed on the membrane is provided, and the float and the indicator of the oil level gauge are connected via a connecting member. There is a method of indicating the position (scale) indicating that the float is floated by the insulating oil leaking on the membrane from the broken portion and the diaphragm is broken by the pointer of the oil level gauge. (See Patent Document 3)

JP 2005-135934 A Patent 4358586 Shoko 414820

  In the techniques described in Patent Documents 1 and 2, damage to the conservator film, such as cracks and perforations, occurs, and the insulating oil in the oil-filled electrical equipment and the conservator does not come into contact with air to cause deterioration of the insulating oil. There is a problem that abnormality (breakage) of the film cannot be determined.

  In the technique of Patent Document 3, the float is floated by the insulating oil leaking from the damaged part of the conservator film onto the film, and the position indicating that the film is damaged is indicated by the pointer of the oil level gauge interlocked with the float. However, depending on the damaged part of the membrane or the oil surface position of the insulating oil, etc., the insulating oil may not leak onto the membrane. Since the float does not float even if the surface is damaged, there is a problem that the film damage cannot be detected from the display of the oil level gauge.

  The present invention can solve the above problems, and provides a diagnostic method capable of reliably evaluating the deterioration state of the membrane and replacing the membrane before the conservator membrane is damaged, such as cracks and perforations. Is.

The invention according to claim 1 is a method for diagnosing a deterioration state of a film used for a conservator, and in an oil-filled electric device including the conservator, the oil-leached electric device or the insulating oil in the conservator is eluted. The plasticizer indicator substance used for the membrane of the conservator is a phthalate ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a benzene ring, R ² , R ³ Is a hydrocarbon group having 1 to 22 carbon atoms), a trimet acetate compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ R ⁴ (R ¹ is a benzene ring, R ² , R ³ , R ⁴ is a hydrocarbon group having 1 to 22 carbon atoms), an alkyl carboxylic acid ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a straight chain having 1 to 22 carbon atoms) An alkyl group, a branched alkyl group, or an alicyclic alkyl group, R ² , R ³ and R ⁴ are hydrocarbon groups having 1 to 22 carbon atoms), SP (solubility parameter) value 8 to 12 (cal / cm ³ ) ^1/2 , and SP value SP _G and plasticizer of the film When the absolute value of the difference in SP value SP _K | SP _G -SP _K | is 3 (cal / cm ³ ) ^1/2 or less and the concentration of the selected indicator substance exceeds 10 ppm It is characterized in that the deterioration of the film progresses and the replacement is necessary.

The invention according to claim 2 is a method for diagnosing a deterioration state of a film used for the conservator according to claim 1, wherein the oil-filled electric device including the conservator is an insulation in the oil-filled electric device or the conservator. A phthalate ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ described in claim 1 is used as an indicator material of a plasticizer used for a membrane of a conservator eluted in oil (R ¹ is a benzene ring, R ² and R ³ are hydrocarbon groups having 1 to 22 carbon atoms), a trimet acetate ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ R ⁴ ( R ¹ is a benzene ring, R ² , R ³ , R ⁴ are hydrocarbon groups having 1 to 22 carbon atoms), an alkyl carboxylic acid ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a linear alkyl group having 1 to 22 carbon atoms or a branched Alkyl group, or an alicyclic alkyl ^{group, R 2, R 3, R} 4 are have a hydrocarbon group), SP (solubility parameter) value 8~12 (cal / cm ^{3) 1/2} of 1 to 22 carbon atoms Then , select from the substances whose absolute value | SP _G -SP _K | of the difference between the SP value SP _{G of the} film and the SP value SP _K of the plasticizer is 3 (cal / cm ³ ) ^1/2 or less. The concentration of the indicator material measured is measured by a gas chromatograph or a liquid chromatograph.

The invention according to claim 3 is a method of diagnosing the deterioration state of the membrane used in the conservator according to claim 1 or claim 2, and the conservator eluted in the insulating oil in the oil-filled electrical device or conservator. A substance to be measured as an indicator substance of a plasticizer used in the film of the phthalate ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a benzene ring, R ² , R ³ is a hydrocarbon group having 1 to 22 carbon atoms.

According to a fourth aspect of the present invention, there is provided a method for diagnosing a deterioration state of a membrane used in the conservator according to the first or second aspect, wherein the conservator is eluted in an insulating oil in the oil-filled electrical device or the conservator. A material to be measured as an indicator material of a plasticizer used in the film of the above is a trimet acetate compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ R ⁴ (R ¹ is a benzene ring, R ² , R ³ and R ⁴ are hydrocarbon groups having 1 to 22 carbon atoms.

According to a fifth aspect of the present invention, there is provided a method for diagnosing a deterioration state of a membrane used in the conservator according to the first or second aspect, wherein the conservator is eluted in the oil-filled electrical device or the insulating oil in the conservator. A substance to be measured as an indicator substance of a plasticizer used in the film of the above is an alkyl carboxylic acid ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ has 1 to 22 carbon atoms) A straight-chain alkyl group, a branched alkyl group, or an alicyclic alkyl group, and R ² , R ³ , and R ⁴ are hydrocarbon groups having 1 to 22 carbon atoms).

The invention according to claim 6 is a method for diagnosing a deterioration state of a membrane used in the conservator according to claim 1 or claim 2, and the conservator eluted in the insulating oil in the oil-filled electrical device or conservator. As an index substance of a plasticizer used in the film, the SP value is 8 to 12 (cal / cm ³ ) ^1/2 and the absolute value of the difference between the SP value SP _{G of the} film and the SP value SP _K of the plasticizer It is characterized by measuring a substance having | SP _G −SP _K | of 3 (cal / cm ³ ) ^1/2 or less.

According to the first aspect of the present invention, the plasticizer used in the membrane of the conservator that elutes into the insulating oil with the passage of time is obtained by using the insulating oil collected in the periodic inspection of the oil-filled electrical equipment . The indicator substance is a phthalic acid ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a benzene ring, R ² and R ³ are hydrocarbon groups having 1 to 22 carbon atoms) A trimet acetate ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ R ⁴ (R ¹ is a benzene ring, R ² , R ³ , R ⁴ are hydrocarbons having 1 to 22 carbon atoms) Group), an alkyl carboxylic acid ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a linear alkyl group having 1 to 22 carbon atoms, or a branched alkyl group, or alicyclic alkyl ^{group, R 2, R 3, R} 4 is a hydrocarbon group having 1 to 22 carbon atoms), SP (solubility Rameta) values 8~12 (cal / cm ³⁾ the absolute value of the difference between the SP value SP _K of a ^half film SP value SP _G and plasticizer | SP _G -SP _K | is 3 (cal / cm ^{3) 1/2} selected from among at which material less, the concentration of the selected indicator substance can exchange membrane to diagnose the state of deterioration of the film on the basis that exceed 10 ppm. Since the membrane can be replaced before it is damaged due to deterioration, it is possible to prevent the insulating oil in the transformer from coming into contact with air and oxidizing. In addition, since the insulating oil collected in the periodic inspection or the like can be used as the sample oil, the analysis sample can be collected in the normal inspection work, and the number of man-hours for sample collection can be reduced.

According to the second aspect of the present invention, the gas chromatograph used for diagnosis of aging deterioration of the insulating oil, abnormal heating / discharge inside the transformer, using the insulating oil collected at the periodic inspection of the oil-filled electrical equipment, The phthalic acid represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ^{3 according} to claim 1, wherein the plasticizer indicator substance used in the membrane of the conservator in the insulating oil by liquid chromatography Ester compounds (R ¹ is a benzene ring, R ² and R ³ are hydrocarbon groups having 1 to 22 carbon atoms), trimet acetate represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ R ⁴ Compounds (R ¹ is a benzene ring, R ² , R ³ , R ⁴ are hydrocarbon groups having 1 to 22 carbon atoms), alkylcarboxylic acid represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ Ester compounds (R ¹ is a linear alkyl group having 1 to 22 carbon atoms, Or a branched alkyl group or an alicyclic alkyl group, R ² , R ³ and R ⁴ are hydrocarbon groups having 1 to 22 carbon atoms), SP (solubility parameter) value 8 to 12 (cal / cm ³ ) ¹ Among the substances having an absolute value | SP _G -SP _K | of 3 (cal / cm ³ ) ^1/2 or less, which has a ^{/ 2} and the difference between the SP value SP _{G of the} film and the SP value SP _K of the plasticizer Select and measure the concentration of the selected indicator substance to diagnose the deterioration of the film. Since the concentration of the indicator substance is measured by the gas chromatograph or liquid chromatograph without using a dedicated measuring device to measure the concentration of the indicator substance, the aging of the insulating oil, abnormal heating inside the transformer, Measurement can be performed at the same time as discharge diagnosis, and rapid measurement and cost reduction of analysis equipment can be reduced.

According to the third aspect of the present invention, the phthalate ester-based compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ is used as an indicator material for the plasticizer used in the conservator membrane. Since the concentration or amount in the insulating oil is measured, the deterioration state of the film can be measured quickly.

According to the invention described in claim ⁴ , the trimet acetate ester system represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ R ⁴ is used as the plasticizer indicator substance used in the membrane of the conservator. Since the concentration or amount of the compound in the insulating oil is measured, the deterioration state of the film can be measured quickly.

According to the invention described in claim 5, the alkylcarboxylic acid ester-based compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ is used as an indicator substance of the plasticizer used in the membrane of the conservator. Since the concentration or amount in the insulating oil is measured, the deterioration state of the film can be measured quickly.

According to the invention described in claim 6, the plasticizer indicator material used in the membrane of the conservator has an SP (solubility parameter) value of 8 to 12 (cal / cm ³ ) ^1/2 , Measure the concentration or amount in the insulating oil of a substance whose absolute value | SP _G -SP _K | of SP value SP _G and plasticizer SP value SP _K is 3 (cal / cm ³ ) ^1/2 or less. Therefore, the deterioration state of the film can be measured quickly.

It is a schematic block diagram which shows an example of the oil-filled electric equipment which has a conservator. Flow chart showing diagnosis method for membrane degradation in conservator

As a result of intensive studies on the cause of the decrease in elasticity of the film used for the conservator, the present inventor has obtained the following knowledge.
The plasticizer contained in the membrane used for the conservator gradually elutes into the insulating oil while being used for many years.
When the plasticizer in the film decreases, the elasticity of the film decreases, and the film tends to be damaged, such as cracks and perforations, due to expansion and contraction due to temperature changes of the insulating oil.

A mode for carrying out the first embodiment of the present invention will be described with reference to FIGS. First, FIG. 1 is a schematic configuration diagram illustrating an oil-filled electrical device (hereinafter referred to as a transformer) such as a transformer. In FIG. 1, a conservator 5 containing a film 4 that absorbs expansion / contraction of the insulating oil 3 due to a temperature change of the insulating oil 3 filled in the transformer 1 and the transformer tank 2 is provided in the upper part of the transformer tank 2. It has been.

The conservator 5 communicates with the transformer tank 2 through a communication pipe 6. Further, a connection pipe 8 having a hygroscopic respirator 7 attached to the end is connected to the upper part of the conservator 5, and the contact between the insulating oil 3 and the atmosphere is blocked by the membrane 4 in the conservator 5. . Further, the displacement of the oil level of the insulating oil 3 due to the expansion / contraction of the insulating oil 3 is displayed on the oil level gauge 10 via the connecting member 9 installed on the upper part of the film 4.

A conservator film deterioration diagnosis method according to the first embodiment of the present invention will be described with reference to the flowchart of FIG. In the deterioration diagnosis method of the first embodiment, the concentration of the indicator substance in the insulating oil 3 (hereinafter referred to as sample oil) collected from the transformer tank 2 or the conservator 5 is measured, and the indicator substance concentration in the sample oil is measured. by comparing the a preset determination value (10 ppm), it is obtained so as to diagnose whether film 4 of conservator 5 is how deterioration.

First, in step S1 of FIG. 2, a predetermined amount of sample oil is collected from the transformer tank 2 or the conservator 5 by using a sampling pipe (not shown) provided in the transformer tank 2 or the conservator 5. In step S2, the concentration of the indicator substance in the sample oil is measured.

Subsequently, in step S3 of FIG. 2, the measured value of the indicator substance concentration in the sample oil is compared with a preset judgment value of 10 ppm . In addition, the said judgment value is 20-30 years after an operation start, and when the density | concentration of the parameter | index substance in sample oil will be near 10 ppm, the elasticity of the film | membrane 4 will fall and it will become easy to generate | occur | produce damage, such as a crack and a piercing | piercing. This was taken into account .

And in step S3 of a figure, when the parameter | index substance density | concentration in sample oil is less than 10 ppm , it is judged in step S4 that the film | membrane 4 of the conservator 5 is normal. If the concentration of the indicator substance in the sample oil exceeds 10 ppm , it is determined in step S5 that the deterioration of the membrane 4 has progressed, and the membrane 4 of the conservator 5 is replaced in step S6. By performing the deterioration diagnosis of the membrane 4 of the conservator 5, the membrane 4 can be exchanged before breakage such as cracks or perforations occurs, so that deterioration of the insulating oil due to contact between the air and the insulating oil 3 is prevented. You can be sure.

Next, a second embodiment of the present invention will be described. In regular inspections of transformer 1, etc., test oil collected from transformer tank 2 is used to diagnose insulation oil aging and abnormal heating / discharge inside transformer tank 2 using a gas chromatograph or liquid chromatograph. ing. Therefore, the membrane degradation diagnosis method for the conservator in the second embodiment of the present invention measures the indicator substance concentration in the sample oil using the gas chromatograph or liquid chromatograph used in the periodic inspection of the transformer 1 , The degree of deterioration of the membrane 4 of the conservator 5 is diagnosed by comparing the indicator substance concentration in the sample oil with a preset judgment value of 10 ppm . According to this film deterioration diagnosis method, the deterioration of the film 4 can be diagnosed at the same time as the aging deterioration of the insulating oil, which is performed in the periodic inspection of the transformer 1, and the abnormal heating / discharge inside the transformer tank 2, so that rapid measurement is possible. And cost for measurement can be reduced.

Next, in the third embodiment of the conservator film deterioration diagnosis method according to the present invention, the plasticizer indicator substance used for the film 4 of the conservator 5 is represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R. By measuring the plasticizer concentration or amount in the sample oil as the phthalate ester compound represented by ³ , and comparing the plasticizer concentration or amount in the sample oil with a preset judgment value, The degree of deterioration of the film 4 is diagnosed.

Next, in the method for diagnosing membrane degradation of a conservator in a fourth embodiment of the present invention, the plasticizer indicator substance used for the membrane 4 of the conservator 5 is represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R By measuring the plasticizer concentration or amount in the sample oil as a trimet acetate ester compound represented by ³ R ⁴ , and comparing the plasticizer concentration or amount in the sample oil with a preset judgment value, The degree of deterioration of the film 4 of No. 5 is diagnosed.

Next, in the method for diagnosing deterioration of a conservator film in a fifth embodiment of the present invention, the plasticizer indicator substance used for the film 4 of the conservator 5 is represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R. By measuring the plasticizer concentration or amount in the sample oil as the alkyl carboxylic acid ester compound represented by ³ , and comparing the plasticizer concentration or amount in the sample oil with a preset judgment value, The degree of deterioration of the film 4 is diagnosed.

Next, the method for diagnosing membrane degradation of a conservator in a fifth embodiment of the present invention is a SP (solubility parameter) value of 8 to 12 (cal / cm ³ ) as an indicator material of a plasticizer used for the membrane 4 of the conservator 5. has a ^1/2, the absolute value of the difference between the SP value SP _K of SP value SP _G and plasticizer film | insulation is ³ (cal / cm 3) ^1/2 or less material | SP _G -SP _K The concentration or amount in the oil is measured, and the plasticizer concentration or amount in the sample oil is compared with a predetermined judgment value so as to diagnose how much the membrane 4 of the conservator 5 has deteriorated. It is a thing.

In the third to sixth embodiments of the present invention, the plasticizer concentration in the sample oil can be quickly calculated by specifying the plasticizer indicator substance.

  In a transformer having a conservator with a film that shields insulating oil from the atmosphere, it can be used to diagnose the deterioration state of the conservator film.

1 ... transformer, 2 ... transformer tank, 3 ... insulating oil, 4 ... membrane,
5 ... Conservator, 6 ... Communication pipe, 7 ... Hygroscopic respirator, 8 ... Connection pipe,
9 ... Connecting member, 10 ... Oil level

Claims (2)

In oil-filled electrical apparatus having a conservator provided with a shield to block insulating oil from the atmosphere, plasticizers used in the shield of the conservator eluted in the insulating oil of the oil-filled electrical device or the conservator The indicator substance is a phthalic acid ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a benzene ring, R ² and R ³ are hydrocarbon groups having 1 to 22 carbon atoms) A trimet acetate ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ R ⁴ (R ¹ is a benzene ring, R ² , R ³ , R ⁴ are hydrocarbons having 1 to 22 carbon atoms) Group), an alkyl carboxylic acid ester compound represented by the general formula R ¹ ((CO ₂ ) ₂ ) R ² R ³ (R ¹ is a linear alkyl group having 1 to 22 carbon atoms, or a branched alkyl group, or alicyclic alkyl ^{group, R 2, R 3, R} 4 is C1-22 charcoal Hydrogen group), SP (solubility parameter) value 8~12 (cal / cm ³⁾ the absolute value of the difference between the SP value SP _K of SP value SP _G and a plasticizer of the shield has a ^1/2 | SP _G - It is characterized in that SP _K | is selected from substances having 3 (cal / cm ³ ) ^1/2 or less, and it is judged that the shield needs to be replaced when the concentration of the selected indicator substance exceeds 10 ppm. Conservator shield deterioration diagnosis method. 2. The shield deterioration diagnosis method for a conservator according to claim 1, wherein the concentration of the indicator substance is measured by a gas chromatograph or a liquid chromatograph.

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