WO2007038845A1 - System for measuring and monitoring the moisture in insulating oil for power transformers and similar - Google Patents
System for measuring and monitoring the moisture in insulating oil for power transformers and similar Download PDFInfo
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- WO2007038845A1 WO2007038845A1 PCT/BR2006/000166 BR2006000166W WO2007038845A1 WO 2007038845 A1 WO2007038845 A1 WO 2007038845A1 BR 2006000166 W BR2006000166 W BR 2006000166W WO 2007038845 A1 WO2007038845 A1 WO 2007038845A1
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 79
- 238000011161 development Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 230000003213 activating effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000004913 activation Effects 0.000 abstract description 3
- 238000003745 diagnosis Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 54
- 238000009413 insulation Methods 0.000 description 6
- 230000018109 developmental process Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000007420 reactivation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
- G01N33/2847—Water in oils
Definitions
- This Invention Patent Application addresses an unheard of "SYSTEM FOR MEASURING AND MONITORING MOISTURE IN INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR", particularly a system for controlling and monitoring moisture under different temperature conditions of the insulating oil of a power transformer and reactor, essentially comprised by a sensor module and an interface module that allows online measuring of the water contained in the oil, providing important subsidies for diagnosing the equipment condition, preserving and increasing its utilization time and preventing damages caused by insulation failure.
- Power transformers and reactors are equipment widely used in generation, transmission and distribution systems of mid, high and ultra-high voltage electric power.
- Such equipment generally uses one or another kind of oil as insulating and heat transfer means, which can be mineral, petroleum derived, vegetal or silicone based, among many others.
- the excess water in the equipment insulating oil produces widely known negative effects, such as the reduction of the insulation dielectric rigidity and the migration of water into the paper used for insulating the windings in a way that such migration brings the risk of bubbles formation and advanced degradation (ageing) of the paper under high temperature conditions. Said factors when acting individually or together, put the integrity of the involved equipment and people at risk, and also reduce the equipment utilization time.
- oil is the water transference medium from the insulating paper in the transformer. It is present in the oil both in soluble and hydrated form, being absorbed by ageing polar products.
- the fiber particles in the oil also contain a certain amount of water.
- the water content in the oil is directly proportional to the relative concentration (saturation) up to the saturation point.
- the water saturation content is inversely proportional to the temperature, the higher the temperature, the lower the water saturation content, and the lower the temperature, the higher the water saturation content.
- the solubility of water in oil and the amount of water oil is capable of dissolving, in parts per million (ppm), as explained above, is affected by the oil temperature and the oil inherent chemical properties represented by the water in oil solubility ratios.
- the mentioned system can be used to increase reliability in measuring and monitoring moisture in insulating oil transformers and similar, as it is formed by an installed sensor module in contact with the oil and an interface module which allows online measuring and monitoring of water content in the oil, providing information significant for the required diagnosis of the equipment current condition, providing parameters such as:
- ⁇ Water saturation percentage converted into a baseline temperature selected by the operator, which allows knowing, for instance, which would be the water saturation amount in the lowest expected oil temperature during the transformer run.
- ⁇ Water saturation percentage converted into a second temperature value, measured Pt 100 ⁇ sensor input at 0 0 C, which allow to know, for instance, which would be the water saturation value if the transformer is de-energized and cools down to ambient temperature (measurement with Pt 100 sensor).
- the moisture monitoring system allows to program high and very high alarm threshold values by water saturation percentage (measured saturation, saturation converted into a baseline temperature and saturation converted into a second temperature value); high and very high water content (ppm) and water high content development trend.
- water saturation percentage measured saturation, saturation converted into a baseline temperature and saturation converted into a second temperature value
- ppm very high water content
- the moisture monitoring system object of this patent includes communication serial ports for network connections with digital surveillance and control systems; programmable analog outputs for remote indications of measured and calculated values; programmable output relays for indication of alarms, internal clock with date and time and non-volatile memory to store the measurements.
- This system extends the utilization time and increases this equipment safety, wherein said system comprises a sensor module (M) installed in contact with the oil and an interface module (I), both permitting online measuring and monitoring of the water content in the oil, providing key information for diagnosis of the equipment condition.
- the proposed system allows to program (P) limiting values for activation of alarms (A) for high (A1) or very high (A2) water saturation content percentage; high (B 1); or very high (B2) water content; and development trend of high (C1) or very high (C2) water content.
- the herein proposed monitoring system enables calculation (IT1) of the saturation percentage of water in oil, converted into a baseline temperature.
- the baseline temperature is programmed (P) by the operator.
- the water solubility in the insulating media decreases as the temperature is reduced, which consequently leads to increased water saturation in oil, even if the water content remains constant.
- P the lowest expected temperature as baseline temperature for the oil during operation of the transformer, allowing knowing how much increased would be the water saturation in oil if reaching such low temperature condition.
- the operator will know if with the actual water content in the oil, an eventual temperature decrease would lead the oil to a condition of excessively high water saturation, with the risk of a failure of the transformers insulation.
- the proposed system also performs calculation (IT2) of the percentage of water in oil, converted into a second measured temperature.
- This conversion temperature is measured in a second temperature measuring input (M1) of the Interface Module (I).
- M1 the second temperature measuring input
- the operator it is possible for the operator to connect the second temperature measuring input (M1) into a sensor for measuring the ambient temperature, allowing to know the increase amount of water saturation in the transformer oil in case the transformer is deenergized, cooling down to ambient temperature.
- the proposed system also performs calculation (IT3) of the dissolved water content in oil, based on the actual measurements of water saturation in oil and the oil temperature at the moisture measuring point.
- the proposed system also performs calculation (IT4) of the development trend of the water content in oil, i.e., the increase or decrease curve of the water content in oil along the timeline, in ppm per day, then activating alarms for high (C1) or very high (C2) development trends.
- the moisture monitoring system object of this patent comprises serial communication ports (R) and analog outputs (R) for remote indications of the measured and calculated values, alarm relays (S) for connection with digital and control supervision systems, internal clock with date and time and non-volatile memory (not represented) to store the measurements.
- the mentioned claimed system can be applied into high voltage equipment types other than power transformers and reactors.
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Biochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Housings And Mounting Of Transformers (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
System for measuring and monitoring the moisture of insulating oil of power transformers and similar preferably applied to power transformers and reactors and similar. This system extends the utilization time and increases this equipment safety, wherein said system comprises a sensor module (M) installed in contact with the oil and an interface module (I), both permitting online measuring and monitoring of the water content in the oil, providing key information for diagnosis of the equipment condition. Based on this information, the proposed system allows to program (P) limiting values for activation of alarms (A) for high (A1) or very high (A2) water saturation content percentage; high (B1); or very high (B2) water content; and development trend of high (C1) or very high (C2) water content.
Description
"SYSTEM FOR MEASURING AND MONITORING THE MOISTURE IN INSULATING OIL FOR POWER TRANSFORMERS AND SIMILAR"
BRIEF INTRODUCTION
This Invention Patent Application addresses an unheard of "SYSTEM FOR MEASURING AND MONITORING MOISTURE IN INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR", particularly a system for controlling and monitoring moisture under different temperature conditions of the insulating oil of a power transformer and reactor, essentially comprised by a sensor module and an interface module that allows online measuring of the water contained in the oil, providing important subsidies for diagnosing the equipment condition, preserving and increasing its utilization time and preventing damages caused by insulation failure.
BRIEF HISTORY
Power transformers and reactors are equipment widely used in generation, transmission and distribution systems of mid, high and ultra-high voltage electric power.
Such equipment generally uses one or another kind of oil as insulating and heat transfer means, which can be mineral, petroleum derived, vegetal or silicone based, among many others.
The excess water in the equipment insulating oil produces widely known negative effects, such as the reduction of the insulation dielectric rigidity and the migration of water into the paper used for insulating the windings in a way that such migration brings the risk of bubbles formation and advanced degradation (ageing) of the paper under high temperature conditions. Said factors when acting individually or together, put the integrity of the involved equipment and people at risk, and also reduce the equipment utilization time.
As a consequence, the evaluation of the potential for failures caused mainly by moisture excess on the power transformer windings and the detection of critical points is of fundamental importance in order to avoid incidents such as power blackouts undergone in most cases by taxpaying citizens.
By way of general information, there exists water equilibrium in the windings paper water oil system, which can be divided in three groups well known by those skilled in the art, which are:
■ Thick structure
■ Cold fine structure
■ Hot fine structure
The experience showed that the moisture collects in different amounts in the abovementioned structures, the larger part of it accumulating on the components of the second group, generating cold zones in such sectors.
As already mentioned, oil is the water transference medium from the insulating paper in the transformer. It is present in the oil both in soluble and hydrated form, being absorbed by ageing polar products. The fiber particles in the oil also contain a certain amount of water.
. The water content in the oil is directly proportional to the relative concentration (saturation) up to the saturation point. In other words, the water saturation content is inversely proportional to the temperature, the higher the temperature, the lower the water saturation content, and the lower the temperature, the higher the water saturation content.
STATE OF THE ART
Conventional systems for measuring and monitoring the moisture of insulating oil in transformers and similar are based on the measuring of the water saturation percentage in the insulating oil, this percentage being referred to as water solubility in oil at the current temperature.
The solubility of water in oil and the amount of water oil is capable of dissolving, in parts per million (ppm), as explained above, is affected by the oil temperature and the oil inherent chemical properties represented by the water in oil solubility ratios.
' Current systems use equipment to perform oil temperature measuring in the same spot where the water saturation percentage measuring is conducted, such measurements being used to calculate the contents of dissolved water in oil, in ppm.
Based on the water saturation percentage and water content several alarms are activated if these variables exceed the predetermined alarm values, since oils presenting excessive water saturation percentage (above 50%) are at risk of forming free water in the oil, which can lead to an insulation failure in the transformer or reactor.
DISADVANTAGE OF THE STATE OF THE ART
• Only the water in oil saturation amount is measured and monitored. Based on that and on the oil temperature, the water content in oil is calculated in ppm. That way the existing systems performs the moisture monitoring only under the current operation temperature condition of the transformers, the operator being unable to anticipate if under other temperature conditions the water content in the oil leads to risky conditions for the transformer insulation, even if there is no risk in the current situation.
THE NEW INVENTION
The mentioned system can be used to increase reliability in measuring and monitoring moisture in insulating oil transformers and similar, as it is formed by an installed sensor module in contact with the oil and an interface module which allows online measuring and monitoring of water content in the oil, providing information significant for the required diagnosis of the equipment current condition, providing parameters such as:
■ Percentage of water saturation in oil and oil temperature at the saturation percentage measuring point.
■ Water content in parts per million (ppm), calculated from measurements of the water saturation percentage and oil temperature with the water solubility ratios programmable by the operator.
■ Water saturation percentage converted into a baseline temperature selected by the operator, which allows knowing, for instance, which would be the water saturation amount in the lowest expected oil temperature during the transformer run.
■ Water saturation percentage converted into a second temperature value, measured Pt 100Ω sensor input at 00C, which allow to know, for instance, which would be the water saturation value if the transformer is de-energized and cools down to ambient temperature (measurement with Pt 100 sensor).
■ Development trends, increase or reduction of the water content in oil in ppm per day (ppm/24 h).
In compliance with provided information as per above description, the moisture monitoring system allows to program high and very high alarm threshold values by water saturation percentage (measured saturation, saturation converted into a baseline temperature and saturation converted into a second temperature value); high and very high water content (ppm) and water high content development trend.
The moisture monitoring system object of this patent includes communication serial ports for network connections with digital surveillance and control systems; programmable analog outputs for remote indications of measured and calculated values; programmable output relays for indication of alarms, internal clock with date and time and non-volatile memory to store the measurements.
Next, the invention will be technically explained, using the block diagram as a base.
DETAILED DESCRIPTION
The "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE IN INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR", object of this Patent Application preferably applied to power transformers, reactors and similar. This system extends the utilization time and increases this equipment safety, wherein said system comprises a sensor module (M) installed in contact with the oil and an interface module (I), both permitting online measuring and monitoring of the water content in the oil, providing key information for diagnosis of the equipment condition. Based on this information, the proposed system allows to program (P) limiting values for activation of alarms (A) for high (A1) or very high (A2) water saturation content percentage; high (B 1); or very high (B2) water content; and development trend of high (C1) or very high (C2) water content.
The herein proposed monitoring system enables calculation (IT1) of the saturation percentage of water in oil, converted into a baseline temperature. The baseline temperature is programmed (P) by the operator.
As mentioned in the first part of this report, the water solubility in the insulating media decreases as the temperature is reduced, which consequently leads to increased water saturation in oil, even if the water content remains constant. This fact permits that with this new function the operator is able to program (P) the lowest expected temperature as baseline temperature for the oil during operation of the transformer, allowing knowing how much increased would be the water saturation in oil if reaching such low temperature condition. By contrast, the operator will know if with the actual water content in the oil, an eventual temperature decrease would lead the oil to a condition of excessively high water saturation, with the risk of a failure of the transformers insulation.
The proposed system also performs calculation (IT2) of the percentage of water in oil, converted into a second measured temperature. This conversion temperature is measured in a second temperature measuring input (M1) of the Interface Module (I). As already mentioned, the water solubility in the insulating media decreases as the temperature is reduced, which consequently leads to an increase of the water saturation in oil, even if the water content remains constant. Therefore, it is possible for the operator to connect the second temperature measuring input (M1) into a sensor for measuring the ambient temperature, allowing to know the increase amount of water saturation in the transformer oil in case the transformer is deenergized, cooling down to ambient temperature. That way it is possible to know if with the currently existing water content in oil, disconnection of the transformer and its consequent cooling-down to the ambient temperature could lead the oil to a excessively high water saturation condition, with risk of failure of the transformer insulation, which could hinder its reactivation.
The proposed system also performs calculation (IT3) of the dissolved water content in oil, based on the actual measurements of water saturation in oil and the oil temperature at the moisture measuring point.
The proposed system also performs calculation (IT4) of the development trend of the water content in oil, i.e., the increase or decrease curve of the water content in
oil along the timeline, in ppm per day, then activating alarms for high (C1) or very high (C2) development trends.
In view of the innovative functions described above, in other words, the calculation of the percentage of water saturation converted into baseline temperatures and into the second measured temperature, there is a possibility to program the values for the activation of alarms for high (A1) or very high (A2) values, both for the measured water saturation percentage and the percentage converted into baseline temperature and converted into the second measured temperature.
The moisture monitoring system object of this patent comprises serial communication ports (R) and analog outputs (R) for remote indications of the measured and calculated values, alarm relays (S) for connection with digital and control supervision systems, internal clock with date and time and non-volatile memory (not represented) to store the measurements.
The mentioned claimed system can be applied into high voltage equipment types other than power transformers and reactors.
Claims
1) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" preferably applied to power transformers, reactors and similar. The present system extends the equipment utilization time and increases the safety thereof, wherein said system comprises a sensor module (M) installed in contact with the oil and an interface module (I), both permitting online measuring and monitoring of the existing water in oil.
2) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 , wherein based on such information, the proposed system allows to program (P) limiting values for activating alarms (A) for high (A1) and very high (A2) water saturation percentages, high (B1) and very high (B2) water content and high (C1) and very high (C2) water content development trends.
3) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein the herein proposed monitoring system make possible calculation of the saturation percentage of water in oil, converted into a baseline temperature.
4) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 3 wherein the baseline temperature is programmed (P) by the operator.
5) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 4 wherein the lowest expected oil temperature during operation of the transformer is programmed (P) as baseline temperature, allowing to know the increase amount of water saturation in oil in case such low temperature condition is reached.
6) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein the herein proposed monitoring system allows calculation (IT2) of the saturation percentage of water in oil, converted into a second measured temperature.
7) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 6 wherein the conversion temperature is measured at a second temperature measuring input (M1), available on the interface module (I).
8) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein the operator can connect the second temperature measuring input (M1)'to a sensor for measuring the ambient temperature.
9) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 8 wherein it is possible to know the elevation amount of water saturation in the transformer oil if the transformer is deenergized, cooled down to ambient temperature.
10) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein the herein proposed monitoring system allows calculation (IT3) of the water content in insulating oil, in parts per million (ppm), then activates alarms for high (B1) and very high (B2) water content.
11) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein the herein proposed monitoring system enables calculation (IT4) of the development trend of the water content in oil along the timeline, in ppm per day, then activates alarms per high (C1) or very high (C2) development trend.
12) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein the water saturation percentages calculated and converted into the baseline temperatures and into the second measured temperature allows to program values to activate alarms for high (A1) and very high (A2) measured water saturation percentages values, converted into the baseline temperature and converted into the second measured temperature.
13) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein serial communication ports (R) and programmable analog outputs (R) for remote indications of measured and calculated values, besides of alarms relays (S) for connection with digital supervising and control system, internal clock with date and time and non-volatile memory (not represented) to store the measurements.
14) "SYSTEM FOR MEASURING AND MONITORING THE MOISTURE OF INSULATING OIL OF POWER TRANSFORMERS AND SIMILAR" according to claim 1 wherein said system can be applied to high-voltage equipment types other than power transformers and reactors.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BRPI0504297 BRPI0504297A (en) | 2005-10-03 | 2005-10-03 | system for measuring and monitoring moisture in insulating oil of power transformers and the like |
| BRPI0504297-6 | 2005-10-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007038845A1 true WO2007038845A1 (en) | 2007-04-12 |
Family
ID=37905920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BR2006/000166 WO2007038845A1 (en) | 2005-10-03 | 2006-08-17 | System for measuring and monitoring the moisture in insulating oil for power transformers and similar |
Country Status (2)
| Country | Link |
|---|---|
| BR (1) | BRPI0504297A (en) |
| WO (1) | WO2007038845A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3066465A4 (en) * | 2013-11-06 | 2017-07-05 | Intellpower Pty Ltd | Method and apparatus for continuous monitoring of quality and moisture parameters of liquids |
| CN114088922A (en) * | 2021-11-08 | 2022-02-25 | 广东电网有限责任公司广州供电局 | Detection system for transformer insulation aging |
| WO2024041281A1 (en) * | 2022-08-25 | 2024-02-29 | 江西亚珀电气有限公司 | Temperature control alarm method and apparatus for three-phase resin insulated dry-type transformer, and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5508624A (en) * | 1993-09-08 | 1996-04-16 | Korea Electrotechnology Institute | Method for measuring degradation level of transformer insulating oil in use, and apparatus for carrying out the method |
-
2005
- 2005-10-03 BR BRPI0504297 patent/BRPI0504297A/en not_active Application Discontinuation
-
2006
- 2006-08-17 WO PCT/BR2006/000166 patent/WO2007038845A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5508624A (en) * | 1993-09-08 | 1996-04-16 | Korea Electrotechnology Institute | Method for measuring degradation level of transformer insulating oil in use, and apparatus for carrying out the method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3066465A4 (en) * | 2013-11-06 | 2017-07-05 | Intellpower Pty Ltd | Method and apparatus for continuous monitoring of quality and moisture parameters of liquids |
| US10101313B2 (en) | 2013-11-06 | 2018-10-16 | IntellPower Pty Ltd. | Method and apparatus for continuous monitoring of quality and moisture parameters of liquids |
| CN114088922A (en) * | 2021-11-08 | 2022-02-25 | 广东电网有限责任公司广州供电局 | Detection system for transformer insulation aging |
| CN114088922B (en) * | 2021-11-08 | 2024-03-05 | 广东电网有限责任公司广州供电局 | Detection system for transformer insulation aging |
| WO2024041281A1 (en) * | 2022-08-25 | 2024-02-29 | 江西亚珀电气有限公司 | Temperature control alarm method and apparatus for three-phase resin insulated dry-type transformer, and device |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0504297A (en) | 2007-06-05 |
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