JP2019145720A - On-load tap changer - Google Patents

Abstract

To provide a protection device of oil-filled electric equipment, capable of maintaining an insulation performance of vegetable oil filled as insulation oil in open type oil-filled electric equipment.SOLUTION: An on-load tap changer fills a palm coconut fatty acid ester oil of vegetable system oil as insulation oil 7 into a container 2b housing a switching changer main body 2a of a vacuum valve type, having an open-type conservator 5, discharges a gas occurred in a breathing pipe 9 connecting an outer part with the conservator 5 during an operation of the switching changer 2a to the outer part, and comprises a regeneration mechanism of a moisture absorbent agent. The on-load tap changer can precisely remove moisture causing an obstacle to an insulation performance of vegetable oil for a long period by filling a hollow fiber membrane that removes moisture in a passing air into a moisture breathing pipe 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a protective device that maintains the insulating performance of insulating oil filled in a load tap changer.

  In order to reduce the environmental load, a transformer using vegetable oil as an insulating oil has been proposed (see Patent Document 1 below).

Patent No. 5,209,581 JP2015-1515397

  The transformer of patent document 1 has a tap switching device, and fills the container of a tap switching device with vegetable oils, such as rapeseed oil, as insulating oil. The insulating oil avoids contact with air by a bag (rubber bag) in an oil expansion chamber (conservator) connected to the tap switching device, and prevents the insulating oil from being deteriorated by oxidation.

  Further, by adopting a vacuum valve type contact for the switching switch of the tap switching device, there is a feature that it is possible to prevent sludge from being generated by the arc at the time of switching the contact of the contact and contaminating the vegetable oil.

  However, in the tap switching device, since the decomposition gas of the insulating oil is generated in the insulating oil by the tap switching operation by the switching switch, it is necessary to release the decomposition gas to the outside from the conservator via the hygroscopic respirator. Therefore, the conservator is usually configured as a so-called open type without a rubber film or a rubber bag (see Patent Document 2).

  However, when vegetable oil is used as insulating oil in an open conservator, it may interfere with the insulating performance of vegetable oil due to moisture absorption in the air and oxidation by oxygen due to contact with air.

  Therefore, in the present invention, in order to solve the above-mentioned problems, in the tap switching device at the time of loading having an open type conservator, plant oil having high oxidation stability against oxygen in the air is used as insulating oil, and switching is performed. An on-load tap switching device having a moisture absorption mechanism that exhausts gas generated by switching operation of a switch to the outside of a container and reliably removes water that impedes insulation performance of vegetable oil is presented.

  According to the first aspect of the present invention, a container containing a vacuum valve type switching switch having an open type conservator is filled with palm oil fatty acid ester oil, which is a vegetable oil, as insulating oil, and breathing that connects the conservator and the outside. It is characterized in that a hygroscopic respirator is provided on the path which releases gas generated when the switching switch is operated to the outside of the container and can maintain the hygroscopic function for a long period.

  The invention according to claim 2 is a vacuum valve-type switching switch filled with the palm oil fatty acid ester oil of the vegetable oil according to claim 1 as an insulating oil, and permeates the respiratory path connecting the conservator and the hygroscopic respirator. The present invention is characterized in that a hygroscopic respirator incorporating a hollow fiber membrane that removes moisture in gas (hereinafter referred to as air), and an oil mist trap on a breathing path that connects the conservator and the hygroscopic respirator.

  According to a third aspect of the present invention, there is provided a branching unit for branching the air flowing from the outside of the hygroscopic respirator and the air from the respiration path into another path to the portion connecting the respiratory path to the hygroscopic respirator according to the second aspect; A backflow prevention device is installed in the bifurcation to prevent backflow of air from the outside and air from the breathing path to the respective paths, and moisture contained in the outside air flowing from the bottom of the breathing breathing apparatus into the moisture absorption breathing apparatus. A moisture-absorbing respirator comprising a moisture removing means using a hollow fiber membrane to be removed and an exhaust path for bringing air from the breathing path into contact with the outside of the moisture removing means

  According to the invention of claim 1, in a container containing a vacuum valve type switching switch having a hygroscopic respirator capable of maintaining a hygroscopic function over a long period of time on a breathing path connecting the open conservator and the outside, By using the palm oil fatty acid ester oil of the vegetable oil subjected to deaeration treatment as the insulating oil, it is possible to prevent the insulating performance from being deteriorated for a long period of time even in a state where it is in contact with air as in the case of the mineral insulating oil.

  In addition, it has a mechanism that automatically regenerates the hygroscopic agent filled in the hygroscopic respirator in order to maintain the hygroscopic function over a long period of time, thereby preventing the moisture absorbent from becoming saturated and moisture in the air from being removed. Can do.

  According to the second aspect of the present invention, the gas generated during the operation of the switching switch permeates through the hygroscopic respirator, but the palm fiber fatty acid ester oil is incorporated by incorporating a hollow fiber membrane that removes moisture in the passing air. Can prevent moisture from absorbing and lowering the insulation performance.

  According to the third aspect of the present invention, in the hygroscopic respirator according to the second aspect, the external air path including air and water is separated from the respiration path not including water, and only the external air receives moisture. By removing moisture efficiently by passing through the hollow fiber membrane to be removed, it is possible to prevent the palm palm fatty acid ester oil from absorbing moisture and lowering the insulation performance.

It is sectional drawing of the tap switching apparatus at the time of Example 1 of this invention. It is sectional drawing of the on-load tap switching device which concerns on Example 2 of this invention. It is sectional drawing of the hygroscopic respiratory apparatus which concerns on Example 2 of this invention.

  A first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an enlarged view of a load tap changer 1 attached to a transformer. In FIG. 1, 2 is a switching switch constituting the on-load tap switching device 1 attached to the transformer tank 3, and 4 is a tap selector.

  Reference numeral 2a denotes a switching switch body housed in a container 2b of the switching switch section 2. The switching switch body 2a employs a vacuum valve type contact not shown as a tap switching contact.

  Reference numeral 5 denotes a conservator connected to the on-load tap switching device 1 via the communication pipe 6. Reference numeral 7 denotes an insulating oil filled in the conservator 5 from the container 2 b of the switching switch unit 2 via the communication pipe 6. Palm oil fatty acid ester oil.

  Reference numeral 8 denotes a hygroscopic respirator connected to the conservator 5 via a respiratory tube 9, 8a denotes a hygroscopic respirator housing, and 8b denotes an inside of the hygroscopic respirator housing 8a for removing moisture in the air. A hygroscopic agent such as silica gel or molecular sieve filled in.

The hygroscopic respirator 8 employs a heating device such as a heater (not shown) as a regeneration mechanism for the hygroscopic agent 8b.
The on-load tap switching device 1 is electrically connected to a transformer body (not shown) housed in the transformer tank 3.

  The on-load tap switching device 1 having the above-described configuration uses the palm oil fatty acid ester oil 7 that is a plant-based oil as the insulating oil of the switching switch unit 2, and therefore has an influence on the environment even if an oil leakage accident occurs. Less is.

  The switching switch 2 employs a vacuum valve contact as a tap switching contact, and has a structure in which the contact portion does not come into contact with palm palm fatty acid ester oil 7. The palm palm fatty acid ester oil 7 is prevented from being soiled.

  However, even in the case of a vacuum valve contact, gas (combustible gas such as hydrogen or ethane or carbon dioxide) is generated by the switching operation. Specifically, 0.01 to 0.1 [ppm] gas is generated per switching operation.

  When the conservator is an open type, gas can be discharged to the outside through the hygroscopic respirator 8 from the insulating oil surface in the conservator. However, when an open type conservator is used, the palm palm fatty acid ester oil 7 which is an insulating oil absorbs moisture in the air flowing in from the outside, and the insulating performance decreases.

  Therefore, in Example 1 of the present invention, a hygroscopic respirator 8 capable of maintaining a hygroscopic function over a long period of time so that palm palm fatty acid ester oil does not absorb moisture in the air is connected to the conservator 5 via a respiratory tube 9. .

  That is, when the temperature of the palm palm fatty acid ester oil 7 in the container 2b of the switching switch 2 rises or falls, the volume of the palm palm fatty acid ester oil 7 changes according to the temperature change. Due to the volume change of the palm palm fatty acid ester oil 7, the air in the conservator 5 is discharged or sucked to the outside through the respiratory tube 9 and the hygroscopic respirator 8.

  Due to the breathing motion of the conservator 5, the air sucked into the conservator 5 and the respiratory tube 9 from the outside is removed by the dehumidifying agent 8 b in the hygroscopic respirator 8, so that the palm palm fatty acid ester oil in the conservator 5 7 can prevent the insulation performance from being deteriorated by absorbing moisture in the air.

  In order to maintain the hygroscopic performance for 20 years, which is the expected life of the switching switch, the hygroscopic respirator may be filled with 10 g or more of silica gel per liter of insulating oil. In consideration of moisture absorption from air that is in contact with other than during breathing, it is desirable to fill 30 g or more per liter of insulating oil. Considering the case of installation in a humid environment, it is desirable to fill 60 g or more per liter of insulating oil.

  Further, the dehumidifying agent such as silica gel filled as the dehumidifying agent 8b is periodically dried by heating with a heating device such as a heater (not shown) attached to the housing 8a of the hygroscopic respirator to regenerate the hygroscopic agent. It can be prevented that saturation prevents moisture in the air from being removed.

  A second embodiment of the present invention will be described with reference to FIG. FIG. 2 is an enlarged view of the on-load tap changer 1 attached to the transformer. In FIG. 2, 2 is a switching switch constituting the on-load tap switching device 1 attached to the transformer tank 3, and 4 is a tap selector.

  Reference numeral 2a denotes a switching switch body housed in a container 2b of the switching switch section 2. The switching switch body 2a employs a vacuum valve type contact not shown as a tap switching contact.

  Reference numeral 5 denotes a conservator connected to the on-load tap switching device 1 via the communication pipe 6. Reference numeral 7 denotes an insulating oil filled in the conservator 5 from the container 2 b of the switching switch unit 2 via the communication pipe 6. Palm oil fatty acid ester oil.

  Reference numeral 8 denotes a hygroscopic respirator connected to the conservator 5 via a respiratory tube 9, and 8a denotes a housing of the hygroscopic respirator. Reference numeral 10 denotes a hollow fiber membrane that removes moisture in the air passing therethrough, and is filled in the housing 8 a so that the air that has passed through the hollow fiber membrane 10 flows into the respiratory tube 9.

  An oil mist trap 11 removes oil mist contained in the air from the conservator 5 and is connected to a communication pipe 9 between the conservator 5 and the hygroscopic respirator.

  As in the first embodiment of the present invention, the switching switch 2a employs a vacuum valve contact as a tap switching contact, and gas (combustible gas such as hydrogen or ethane or carbon dioxide) is generated by the switching operation. Will occur. Specifically, 0.01 to 0.1 [ppm] gas is generated per switching operation.

  When the conservator is an open type, gas can be discharged to the outside through the hygroscopic respirator 8 from the insulating oil surface in the conservator. However, when an open type conservator is used, the palm palm fatty acid ester oil 7 which is an insulating oil absorbs moisture in the air flowing in from the outside, and the insulating performance decreases.

  Therefore, in the second embodiment of the present invention, the hygroscopic respirator 8 filled with the hollow fiber membrane 10 having the performance of removing moisture in the passing air is connected to the conservator 5 via the respiratory tube 9.

  That is, when the temperature of the palm palm fatty acid ester oil 7 in the container 2b of the switching switch rises or falls, the volume of the palm palm fatty acid ester oil 7 changes according to the temperature change. Due to the volume change of the palm palm fatty acid ester oil 7, the air in the conservator 5 is discharged or sucked to the outside through the respiratory tube 9 and the hygroscopic respirator 8.

  By the breathing motion of the conservator 5, moisture is removed from the air sucked from the outside into the conservator 5 and the respiratory tube 9 by the hollow fiber membrane 8 c in the hygroscopic respirator 8. For this reason, it can prevent that the palm palm fatty-acid ester oil 7 in the conservator 5 absorbs the water | moisture content in air, and reduces insulation performance.

  Furthermore, the hygroscopic respirator 8 used in Example 2 of the present invention will be described with reference to FIG. 8a is a housing of the hygroscopic respirator 8, and 10 is a hollow fiber membrane that removes moisture in the passing air. Reference numeral 12 denotes a moisture removing means in which the hollow fiber membranes 10 are bundled in order to secure a length capable of removing moisture in the air sucked from the lower part of the hygroscopic respirator.

  Reference numeral 13 denotes a branching portion for branching the air flowing from the outside of the hygroscopic breathing device 8 and the air from the breathing route 9 into different paths at a portion where the respiratory path 9 and the hygroscopic breathing device 8 are connected. This is a backflow prevention device that prevents the air from the breathing path 9 and the air that has passed through the moisture removing means 12 from flowing back to the respective paths.

  Reference numeral 15 denotes an exhaust path for bringing the air from the breathing path 9 into contact with the moisture removing means 12 in the housing 8a.

  This hygroscopic respirator 8 brings the air from the breathing path 9 that does not contain moisture in the housing 8a into contact with the hollow fiber membrane 10 of the moisture removing means 12, so that external air passing through the hollow fiber membrane 10 and The water vapor pressure difference between the air in the breathing path 9 can be used. For this reason, the ability to remove moisture by the hollow fiber membrane 10 can be enhanced.

  As described above, according to the protection device of the present invention, even if palm oil fatty acid ester oil of vegetable oil is used as insulating oil for electrical equipment, deterioration of insulating performance due to absorption of moisture in the air is surely prevented. be able to.

  The present invention is applicable to various electric devices that use palm palm fatty acid ester oil as an insulating oil.

DESCRIPTION OF SYMBOLS 1 Tap switching device at the time of load 2 Switching switch part 2a Switching switch body 2b Container of switching switch 3 Transformer tank 4 Tap selector 5 Conservator 6 Connecting pipe 7 Insulating oil (palm palm fatty acid ester oil)
8 Hygroscopic respirator 8a Housing 8b Hygroscopic agent
DESCRIPTION OF SYMBOLS 9 Breathing tube 10 Hollow fiber membrane 11 Oil mist trap 12 Water | moisture-content removal means 13 Branch part 14 Backflow prevention apparatus 15 Exhaust flow path

Claims (3)

  Filling the container containing the vacuum valve type switch with open type conservator with palm oil fatty acid ester oil of vegetable oil as insulating oil, and operating the switch on the breathing path connecting the conservator and the outside An on-load tap changer equipped with a hygroscopic respirator capable of releasing gas generated at times to the outside of the container and maintaining a hygroscopic function over a long period of time.   A vacuum valve type switching switch filled with palm oil fatty acid ester oil of vegetable oil according to claim 1 as an insulating oil, which removes moisture in the gas that permeates the respiratory path connecting the conservator and the hygroscopic respirator And a hygroscopic respirator having a hollow fiber membrane built therein, and an on-load tap changer provided with an oil mist trap on a respiratory path connecting the conservator and the hygroscopic respirator.   The hygroscopic respirator according to claim 2, wherein a branch portion for branching the air flowing from the outside of the hygroscopic respirator to the portion connecting the breathing path and the hygroscopic breather and the air from the breathing path to another path and the branch A backflow prevention device is installed to prevent air from the outside and air from the breathing path from flowing back to the respective paths in the section, and the moisture contained in the outside air flowing from the lower part of the moisture breathing breather is removed inside the moisture absorbing breather. Moisture-absorbing respirator provided with a moisture removing means using a hollow fiber membrane and an exhaust path for bringing the air from the breathing path into contact with the outside of the moisture removing means

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