KR102014265B1 - Potable device for storing and supplying standard oil, method for verifying sensor of dissolved gas in oil and diagnosing fault type of transformer using the same - Google Patents

Abstract

The present invention is to provide a portable device for storing and supplying standard insulating oil comprising: a standard insulating oil container formed to store standard insulating oil inside; a standard insulating oil inlet provided in the standard insulating oil container; a storage cover and a circulation cover formed to cover the standard insulating oil inlet and coupled to be selectively detached from the edge of the standard insulating oil inlet; a sealant provided in a circular form to be installed on the edge of the standard insulating oil inlet and consisting of a copolymer; and a supply line and a recovery line installed to penetrate the circulation cover and connected to a sensor of dissolved gas in oil to circulate standard insulating oil stored in the standard insulating oil container to the sensor of dissolved gas in oil.

Description

Portable standard insulation oil storage and supply, and verification method of oil in gas sensor and diagnosis of failure type of transformer using this device USING THE SAME}

The present invention relates to a portable standard insulating oil storage and supply device for verifying and correcting the accuracy of the oil-in-water gas sensor and diagnosing the state of the transformer in relation to the oil-in-water sensor for monitoring the state of the transformer or the like at any time.

Insulating oil is used for electrical insulation of electrical installations. At present, the most accurate method of diagnosing a state of a transformer for transmission and distribution is to extract gas from the insulating oil and measure the amount of gas dissolved in the insulating oil by gas chromatography. This method is used by utilities worldwide and is widely used in transformer preventive diagnostics. For example, Korean Patent Laid-Open No. 10-2014-0055652 (2014.05.09.) Discloses an apparatus and a method for measuring the gas concentration in a transformer.

However, this method is only possible with expensive analytical equipment and with a system for extracting gas from the insulating oil. Therefore, this method is mainly performed in laboratories equipped with expensive analytical devices, but not in the field.

Recently, in line with the 4th Industrial Revolution, a system for installing a gas-in-oil sensor on a transmission and distribution transformer and monitoring the status of the transformer at any time is expanding. To extend this trend, it is very important to secure the reliability of the system. In particular, in order to maintain and maintain the maintenance of the oil gas sensor, a device for verifying and correcting the accuracy of the oil gas sensor installed in the field is essential.

However, at present, there is no method for evaluating reliability and measuring accuracy of the oil in gas sensor at the site where the oil in gas sensor is installed.

The present invention is to propose a portable standard insulating oil storage and supply device that can verify and calibrate the accuracy of the oil-in-oil sensor using the standard insulating oil, and to diagnose the failure type of the transformer.

The present invention provides a portable standard insulating oil storage and supply device configured to store the standard insulating oil in a state capable of blocking the contact between the standard insulating oil and external air so as to ensure the validity of the standard insulating oil even during long-term storage of the standard insulating oil. It is for.

The present invention is to provide a portable standard insulating oil storage and supply apparatus configured to supply a standard insulating oil to the oil in gas sensor at a desired flow rate while maintaining the same temperature as the transformer.

The present invention is to propose a method for verifying the accuracy of the oil in gas sensor and diagnosing the failure type of the transformer using a portable standard insulating oil storage and supply device.

In order to achieve the object of the present invention, a portable standard insulating oil storage and supply apparatus according to an embodiment of the present invention, the standard insulating oil container formed to store the standard insulating oil therein; A standard insulating oil entrance formed in the standard insulating oil container; A storage cover and a circulation cover which are formed to cover the standard insulating oil inlet and which are selectively detachably coupled around the standard insulating oil inlet and outlet; A sealant formed in a ring shape so as to be mounted around the standard insulating oil entrance and exit and made of a copolymer; And a supply line and a recovery line installed to penetrate the circulation cover and connected to the oil gas sensor so as to circulate the standard insulation oil stored in the standard insulation oil container to the oil gas sensor.

According to an example related to the present invention, the storage cover has an annular shape including a first portion inserted into the standard insulating oil inlet and a second portion bent from the first portion to be mounted around the standard insulating oil inlet and outlet. Inner cover; And an outer cover formed to block the standard insulating oil inlet and surround the standard insulating oil inlet, and coupled to the circumference of the standard insulating oil inlet with the inner cover therebetween.

According to another example related to the present invention, the circumference of the standard insulating oil entrance is formed to protrude from one side of the standard insulating oil container, and the sealant is disposed between one surface of the standard insulating oil container and the outer cover.

According to another embodiment related to the present invention, the portable standard insulating oil storage and supply device, a membrane covering the standard insulating oil inlet to prevent leakage of the standard insulating oil stored in the standard insulating oil container during circulation of the standard insulating oil; A silicon support disposed to cover the membrane and formed to support the supply line or the recovery line; And a coating layer formed of polytetrafluoroethylene and formed on an outer surface of the silicon support, wherein the membrane, the silicon support and the coating layer are disposed inside the circulation cover, and the supply And a hole for penetrating the line or the recovery line.

According to another example related to the present invention, the circulation cover has a hole for penetrating the supply line or the recovery line, and the portable standard insulating oil storage and supply device is between the supply line and the hole, or A leakage preventing part is further formed to prevent leakage of standard insulating oil between the recovery line and the hole, wherein the leakage prevention part extends along the supply line or the recovery line and extends the supply line or the recovery line. Line coupling portion formed to wrap; And a leakage preventing film formed in an annular shape around the line coupling portion to cover the supply line and the hole or to cover the recovery line and the hole.

According to another example related to the present disclosure, the recovery line may include one end formed to be connected to the oil in gas sensor; And the other end formed opposite to the one end, wherein the portable standard insulating oil storage and supply device further includes a discharge connector for discharging the standard insulating oil recovered through the recovery line to the outside, and the discharge connector It is formed to be detachable to the other end.

According to another embodiment related to the present invention, the portable standard insulating oil storage and supply apparatus, the heater is formed to heat the standard insulating oil stored in the standard insulating oil container; And a temperature control controller for controlling the heater to maintain the temperature of the standard insulating oil stored in the standard insulating oil container the same as the temperature of the transformer.

According to another example related to the present invention, the portable standard insulating oil storage and supply device further includes a heating coil wound around the supply line and around the recovery line.

According to another example related to the present invention, the portable standard insulating oil storage and supply apparatus is formed to be connectable to the oil in gas sensor, and circulates the standard insulating oil stored in the standard oil in oil container to the oil in gas sensor. A data transmission cable transferring data generated by the oil in gas sensor; A data processor configured to diagnose a failure type of a transformer in which the oil-in-gas sensor is installed based on data received through the data transmission cable; And a data output unit configured to output a failure type of the transformer diagnosed by the data processing unit.

According to another example related to the present invention, the portable standard insulating oil storage and supply device further includes a case formed to be portable.

In addition, the present invention discloses a method for verifying the oil-in-water gas sensor and the failure type diagnosis method of the transformer using a portable standard insulating oil storage and supply device to realize the above problems. The method includes connecting a supply line and a recovery line installed in a circulation cover of a portable standard insulating oil storage and supply device to the oil in gas sensor, and connecting a discharge connector to the recovery line; Supplying standard insulating oil to the oil in gas sensor through the supply line, and discharging the standard insulating oil recovered through the recovery line to the discharge connector to wash the supply line and the recovery line; Separating the discharge connector from the recovery line and connecting the recovery line to a standard insulating oil container of a portable standard insulating oil storage and supply device to circulate the standard insulating oil stored in the standard insulating oil container to the oil in gas sensor; Detecting an indication value output from the oil in gas sensor according to the circulation of the standard insulating oil; And diagnosing a failure type of the transformer in the portable standard insulating oil storage and supply device based on the indication value.

According to an example related to the present invention, the unit hourly flow rate of the standard insulating oil supplied through the supply line in the circulating step is twice that of the unit hourly flow rate of the standard insulating oil supplied through the supply line in the washing step. Is greater than

According to another example related to the present invention, the method of verifying a gas-in-oil sensor using the portable standard insulating oil storage and supply device and diagnosing a failure type of a transformer is performed before the step of connecting the discharge connector to manufacture a standard insulating oil. Making; Injecting the prepared standard insulating oil into a standard insulating oil container of a portable standard insulating oil storage and feeding device and closing the standard insulating oil entrance with a storage cover; Transferring the portable standard insulating oil storage and supply device to a vicinity of the oil-in-water sensor to be verified or the transformer to be diagnosed; And replacing the storage cover with the circulation cover.

According to another example related to the present invention, in the circulating step, the standard insulating oil stored in the standard insulating oil container and the standard insulating oil flowing through the supply line or the recovery line are heated to maintain a constant temperature.

According to the present invention having the above-described configuration, the standard insulating oil can be stored for a long time in a state at the time of manufacture without contacting the portable standard insulating oil storage and supply device.

In addition, according to the present invention, the standard insulating oil can be supplied to the oil-in-oil sensor while maintaining the temperature of the standard insulating oil and the flow rate per unit time at the site where the oil-in-water sensor is installed.

In addition, according to the present invention, since the supply line and the recovery line are washed through a pretreatment process called line washing, the accuracy of the oil in gas sensor can be accurately verified even in repeated use.

In addition, the present invention provides a basis for verifying and calibrating the accuracy of the oil in gas sensor using a portable standard insulating oil storage and supply device, and can diagnose the failure type of the transformer.

1 is a perspective view showing a portable standard insulating oil storage and supply device of the present invention.
FIG. 2 is a conceptual view illustrating a configuration in which a storage cover is coupled to a standard insulating oil entrance and exit of the portable standard insulating oil storage and supply device illustrated in FIG. 1.
FIG. 3 is a conceptual view illustrating a configuration in which a circulation cover is coupled to a standard insulating oil inlet and outlet of the portable standard insulating oil storage and supply device illustrated in FIG. 1.
FIG. 4 is a flowchart illustrating a method of verifying the accuracy of a water-in-oil sensor and diagnosing a failure type of a transformer using the portable standard insulating oil storage and supply device of FIG. 1.
FIG. 5 is a flow chart showing the flow of standard insulating oil during the line cleaning procedure in the method of FIG. 4.
FIG. 6 is a flow chart showing the flow of standard insulating oil during the detection of sensor readings and diagnosis of a failure type of a transformer in the method of FIG.

Hereinafter, a portable standard insulating oil calibration apparatus according to the present invention will be described in more detail with reference to the accompanying drawings.

In the present specification, different embodiments are given the same or similar reference numerals for the same or similar components, and description thereof is replaced with the first description.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

As used herein, the singular forms "a", "an" and "the" include plural forms unless the context clearly indicates otherwise.

Oil-in-water sensors that monitor the condition of the transformer verify the accuracy using standard insulating oils. Therefore, the verification of the oil in gas sensor and the diagnosis of the failure type of the transformer are carried out in the order of first preparing a standard insulating oil, then supplying the prepared standard insulating oil to the oil in gas sensor, and finally verifying and diagnosing. Hereinafter, methods and devices related to these three processes will be described.

First, the production of standard insulating oil will be described.

1. Standard Insulation Oil Manufacturing

In order to verify the accuracy of the oil-in-water sensor, at least 500 mL, preferably about 800 mL, of standard insulating oil should be supplied to the oil-in-water sensor. If you add up to the amount needed to clean the line of portable standard insulating oil storage and supply, which will be described later, the standard insulating oil needs about 1L.

The standard insulating oil may be manufactured by the standard insulating oil manufacturing system and method disclosed in Korean Patent Laid-Open No. 10-2011-0034904 (April 06, 2011). Standard insulating oils are prepared by dissolving standard gases of the desired concentration in fresh oil.

Standard insulating oils should be kept intact without deterioration in concentration even after storing or transporting for at least two weeks. The storage of standard insulating oil is by means of portable standard insulating oil storage and supply.

2. Portable Standard Insulating Oil Storage and Supply Unit (100)

1 is a perspective view showing a portable standard insulating oil storage and supply device 100 of the present invention.

The portable standard insulating oil storage and supply device 100 of the present invention is portable and configured to store the standard insulating oil in its original state for a long time.

The case 110 forms the appearance of the portable standard insulating oil storage and supply device 100. The case 110 is formed to be portable. The case 110 includes a lower case 112 and an upper case 111. The lower case 112 and the upper case 111 are connected to each other by a hinge 113. Relative rotation of the lower case 112 and the upper case 111 reveals its internal configuration.

Hereinafter, the internal structure of the portable standard insulating oil storage and supply device 100 will be described.

The standard insulating oil container 120 is formed to store the standard insulating oil therein.

The standard insulating oil container 120 is formed with a standard insulating oil entrance. A storage cover 130 and a circulation cover 140 may be selectively coupled around the standard insulating oil entrance and exit. Optionally, the storage cover 130 and the circulation cover 140 are both compatible around the circumference of the standard insulating oil inlet, and if necessary, any of the storage cover 130 and the circulation cover 140 may be combined. It means that one can be coupled around the standard insulating oil entrance.

The storage cover 130 is formed to cover the standard insulating oil entrance. Storage cover 130 has a configuration that can maintain the standard insulating oil without lowering the concentration after injecting the standard insulating oil to the standard insulating oil container 120. This configuration will be described later with reference to FIG. 2.

The circulation cover 140 is formed to cover the standard insulating oil inlet and outlet. The circulation cover 140 is provided with a line 141. Line 141 includes a supply line and a recovery line. The supply line and the recovery line are configured to supply or recover the standard insulating oil stored in the standard insulating oil container 120 to the oil in gas sensor. The supply line and the return line may be provided with a supply line valve and a return line valve, respectively.

Additionally, the portable standard insulating oil storage and supply device 100 includes a heater 150, a thermocouple (not shown), a temperature controller 151, an oil pump (not shown), a mass flow meter (not shown), an input unit ( 161, a data transmission cable (not shown), a data processing unit 162, a data output unit 163, a data storage unit 170, and a printer (not shown) may be provided.

The heater 150 is configured to heat the standard insulating oil stored in the standard insulating oil container 120.

The thermocouple is formed to sense the temperature of the standard insulating oil stored in the standard insulating oil container 120.

The temperature controller 151 controls the heater 150 to maintain the temperature of the standard insulating oil stored in the standard insulating oil container 120 the same as the normal operating temperature of the transformer.

The temperature of the standard insulating oil sensed by the thermocouple is used to control the heater 150 of the temperature controller 151. By the heater 150, the thermocouple and the temperature control controller 151, the standard insulating oil may be supplied to the water-in-oil sensor at the same temperature as the normal operating temperature of the transformer.

The oil pump is configured to transfer the standard insulating oil stored in the standard insulating oil container 120 to the oil in gas sensor. Standard insulating oil is pressurized by an oil pump and fed to the oil in gas sensor via the supply line.

The mass flow controller is configured to maintain a constant flow rate of the standard insulating oil supplied to the oil in gas sensor through the supply line.

By means of an oil pump and a mass flow meter, standard insulating oil can be supplied to the oil in gas sensor at a constant flow rate per minute.

The input unit 161 is formed to receive a user's control command. The portable standard insulating oil storage and supply device 100 may be operated based on a control command applied through the input unit 161.

The data transmission cable is formed to be connectable to the oil in gas sensor. The case 110 may be provided with an interface for connecting a data transmission cable. As the data transmission cable circulates the standard insulating oil to the oil in gas sensor, the data transmission cable transmits data generated in oil in gas to the data processor 162.

The data processor 162 is configured to diagnose a failure type of the transformer in which the oil in gas sensor is installed based on the data received through the data transmission cable. The data processor 162 may include an algorithm for diagnosing a failure type.

The data output unit 163 is configured to output a failure type of the transformer diagnosed by the data processing unit 162. For example, the data output unit 163 may be configured as a display, and the failure type of the transformer may be visually output.

The data storage unit 170 is configured to store the accuracy verification result of the oil in gas sensor and the failure type result of the transformer.

Next, the storage cover 130 and the circulation cover 140 will be described sequentially.

FIG. 2 is a conceptual view illustrating a configuration in which a storage cover 130 is coupled to standard insulating oil inlets 121 and 122 of the portable standard insulating oil storage and supply device 100 illustrated in FIG. 1.

One or more standard insulating oil inlets 121 and 122 may be provided in the standard insulating oil container 120. The circumferences of the standard insulating oil inlets 121 and 122 may have a shape protruding in a cylindrical shape from one surface of the standard insulating oil container 120.

Storage cover 130 is a configuration for preserving the standard insulating oil stored in the standard insulating oil container 120 in the original state for a long time without decreasing the concentration. The storage cover 130 is detachably coupled to the circumferences of the standard insulating oil inlets 121 and 122. The storage cover 130 includes an inner cover 130a and an outer cover 130b.

The inner cover 130a is formed in an annular shape and includes a first portion 130a1 and a second portion 130a2.

The first portion 130a1 is formed to be inserted into the standard insulating oil inlets 121 and 122. For example, the first portion 130a1 extends along the height direction around the standard insulating oil inlets 121 and 122. The first portion 130a1 is formed in an annular contact with the inner circumferential surfaces of the standard insulating oil inlets 121 and 122.

The second portion 130a2 is bent from the first portion 130a1 to be mounted around the standard insulating oil inlets 121 and 122. The second portion 130a2 is formed in an annular shape that can be mounted around the standard insulating oil inlets 121 and 122.

The outer cover 130b is formed to block the standard insulating oil inlets 121 and 122. In addition, the outer cover 130b is formed to surround the standard insulating oil inlets 121 and 122. The outer cover 130b is coupled around the standard insulating oil inlets 121 and 122 with the inner cover 130a interposed therebetween.

The sealant 131 is formed in an annular shape to be mountable around the standard insulating oil inlets 121 and 122.

The sealant 131 may be formed of any one of bio silicon, other silicon materials, and copolymers. Among them, the copolymer sealant 131 is most preferred. For example, the sealant 131 is formed of a copolymer selected from the group consisting of styrene, ethylene, butylene, and polystyrene.

Biosilicon, other silicone-based materials, and copolymers were selected as the material of the sealant 131, and the experiment was conducted on the airtight state of the standard insulating oil. Standard insulating oil was prepared by selecting the theoretical concentration of 500ppm, the standard gas used for low and high concentrations are shown in Table 1. In Table 1, the unit of concentration of standard gas is μmol / mol, and the unit of theoretical concentration of standard insulating oil is ppm.

Gas type
Low concentration
Manufacturing
Standard gas Low concentration
Standard insulating oil
Theoretical concentration High concentration
Manufacturing
Standard gas High concentration
Standard insulating oil
Theoretical concentration H ₂ 1,000 50.0 10,098 504.9 O ₂ 1,020 13497.6 10,296 15708.4 N ₂ balance 49550.0 balance 45461.5 CO 997 49.9 10,072 503.6 CO ₂ 994 49.7 10,042 502.1 CH ₄ 1,003 50.2 10,135 506.8 C ₂ H ₄ 996 49.8 10,057 502.9 C ₂ H ₆ 994 49.7 10,039 502.0 C ₂ H ₂ 1,005 50.3 10,012 500.6 C ₃ H ₈ 992 49.6 10,019 501.0

And the manufacturing conditions of the standard insulating oil is shown in Table 2.

Standard Insulation Oil Production 1 L Standard gas injection volume 50 mL Standard gas injection pressure 2.2 Pa MFC Flow 100 mL / min New oil degassing time 3 h Degassing Oil Temperature 50 ℃

The experimental results are shown in Table 3.

Sealant Bio silicon Other silicone Copolymer Standard
Insulation oil Retention period 2 weeks 3 weeks 2 weeks 3 weeks 2 weeks 3 weeks H ₂ 382 427 485 504 499 516 504 O ₂ 20,970 21,668 15,626 17,787 16,598 17,535 15,708 N ₂ 59,132 62,374 45,796 51,169 48,490 50,550 46,348 CO 439 457 493 512 503 489 503 CO ₂ 477 488 485 494 519 493 501 CH ₄ 514 491 490 502 496 504 506 C ₂ H ₄ 484 476 476 480 478 478 502 C ₂ H ₆ 479 473 585 475 477 472 501 C ₂ H ₂ 501 476 480 489 481 494 480 C ₃ H ₈ 469 467 468 465 468 465 501

As a result of the experiment, the biosilicone-based polymer used as a material of the general gas sealant 131 was found to be somewhat inferior in gastight performance of some gases such as hydrogen gas having a small molecular weight. In addition, while other silicone-based materials maintain an airtight state similar to that of the copolymer, there was a disadvantage in that the detachment of the sealant 131 was difficult. In contrast, the copolymer was found to have both excellent airtight performance and easy desorption.

When the storage cover 130 is coupled around the standard insulating oil inlets 121 and 122, the one surface of the standard insulating oil container 120 and the outer cover 130b are spaced apart from each other. The sealant 131 is disposed between one surface of the standard insulating oil container 120 and the outer cover 130b.

The standard insulating oil may be stored in the standard insulating oil container 120 in its original state during manufacture for at least two weeks or more without decreasing the concentration by the standard insulating oil storage cover 130 and the sealant 131.

Reference numeral 150 not described in FIG. 2 corresponds to the heater 150. The heater 150 is for controlling the temperature of the standard insulating oil, which has been described above.

3 is a conceptual diagram illustrating a configuration in which the circulation covers 140a and 140b are coupled to the standard insulating oil inlets 121 and 122 of the portable standard insulating oil storage and supply device 100 illustrated in FIG. 1.

The circulation covers 140a and 140b are necessary components when supplying standard insulating oil to the oil in gas sensor. The circulation covers 140a and 140b are detachably coupled around the standard insulating oil inlets 121 and 122. The circulation covers 140a and 140b have the same shape as the outer cover 130b of the storage cover 130 except for a hole for penetrating the supply line 141a and the recovery line 141b. This is because the storage cover 130 and the circulation cover 140a and 140b are compatible to be selectively coupled around the standard insulating oil inlets 121 and 122.

The supply line 141a and the recovery line 141b are formed to penetrate the circulation covers 140a and 140b. The supply line 141a and the recovery line 141b are formed to be connectable to the oil in gas sensor in order to circulate the standard insulating oil stored in the standard oil in oil container 120 to the oil in gas sensor. The supply line 141a is immersed in the standard insulating oil to receive the standard insulating oil pressurized by the oil pump.

If more than two standard insulating oil inlets 121 and 122 are formed in the standard insulating oil container 120 as shown in FIG. 3, the supply line 141a and the recovery line 141b are installed in different circulation covers 140a and 140b. Can be. On the other hand, if only one standard insulating oil inlet (121, 122) is formed, the supply line (141a) and the recovery line (141b) may be installed in one circulation cover (140a, 140b).

The heating coil may be wound around the supply line 141a and the recovery line 141b. The temperature of the standard insulating oil should be kept constant while supplying the standard insulating oil to the oil in gas sensor or withdrawing the standard insulating oil from the oil in gas sensor. The heating coil is wound around the supply line 141a and the recovery line 141b to heat the standard insulating oil flowing through the supply line 141a and the recovery line 141b.

As the supply line 141a and the recovery line 141b pass through the circulation covers 140a and 140b, a gap may exist between the supply line 141a and the hole or between the recovery line 141b and the hole. In order to prevent the standard insulating oil from leaking through this gap, leakage preventing portions 145a and 145b are provided.

The leakage preventing parts 145a and 145b include line coupling parts 145a1 and 145b1 and leakage preventing films 145a2 and 145b2.

The line coupling parts 145a1 and 145b1 are formed to surround the supply line 141a or the recovery line 141b. The line coupling portions 145a1 and 145b1 extend along the supply line 141a or the recovery line 141b. The line coupling portions 145a1 and 145b1 are coupled around the supply line 141a or the recovery line 141b.

The leakage preventing films 145a2 and 145b2 are formed in an annular shape around the line coupling portions 145a1 and 145b1 so as to cover the gap between the supply line 141a and the hole or between the recovery line 141b and the hole. As the leakage preventing films 145a2 and 145b2 cover the supply line 141a and the hole, or between the recovery line 141b and the hole, leakage of the standard insulating oil can be prevented.

The discharge connector 146 may be connected to the recovery line 141b as needed. It is necessary to clean the supply line 141a and the recovery line 141b before circulating the standard insulating oil through the supply line 141a and the recovery line 141b. In this case, the discharge connector 146 may be connected to the recovery line 141b to discharge some of the standard insulating oil recovered from the oil in gas sensor to the outside.

If one part of both ends of the recovery line 141b is connected to the oil in gas sensor, and the other end thereof is called the other end, the discharge connector 146 is detachably formed at the other end. When the cleaning process is completed, the discharge connector 146 is separated from the recovery line 141b, and the recovery line 141b is inserted into the standard insulating oil container 120 through the circulation covers 140a and 140b.

Meanwhile, membranes 142a and 142b and silicon supports 143a and 143b may be installed on the circulation covers 140a and 140b, and coating layers 144a and 144b may be formed on the silicon supports 143a and 143b. have. The supply line 141a or the recovery line 141b penetrates the membranes 142a and 142b, the silicon supports 143a and 143b, and the coating layers 144a and 144b, and thus the membranes 142a and 142b and the silicon support 143a. , 143b and the coating layers 144a and 144b have holes corresponding to the supply line 141a or the recovery line 141b.

The membranes 142a and 142b cover the standard insulating oil inlets 121 and 122 to prevent leakage of the standard insulating oil stored in the standard insulating oil container 120 during circulation of the standard insulating oil. By the membranes 142a and 142b and the leakage preventing parts 145a and 145b described above, leakage of the standard insulating oil may be prevented.

The silicon supports 143a and 143b are arranged to cover the membranes 142a and 142b. The silicon supports 143a and 143b are formed to support the supply line 141a or the recovery line 141b. For example, the silicon supports 143a and 143b are formed to surround the circumference of the supply line 141a or the recovery line 141b, and are rigid and elastic to support the supply line 141a and the recovery line 141b by themselves. Has In particular, since the silicon supports 143a and 143b have elasticity, the silicon supports 143a and 143b when the inner diameter of the hole formed in the silicon supports 143a and 143b is smaller than the outer diameter of the supply line 141a or the recovery line 141b. Can tightly support the supply line 141a or the recovery line 141b.

Coating layers 144a and 144b are formed on the outer surfaces of the silicon supports 143a and 143b. The coating layers 144a and 144b may be made of polytetrafluoroethylene. As the coating layers 144a and 144b are formed, contact between standard insulating oil and air may be blocked.

When the circulation covers 140a and 140b are joined around the standard insulating oil inlets 121 and 122, the membranes 142a and 142b, the silicon supports 143a and 143b, and the coating layers 144a and 144b are provided with a circulation cover ( It is arrange | positioned inside 140a, 140b. When the standard insulating oil is circulated, leakage or air contact of the standard insulating oil may be blocked by the membranes 142a and 142b, the silicon supports 143a and 143b, and the coating layers 144a and 144b.

Hereinafter, a method of verifying the accuracy of the oil in gas sensor and diagnosing a failure type of a transformer using the portable standard insulating oil storage and supply device will be described.

3. Verification of oil in gas sensor and diagnosis of failure type of transformer

FIG. 4 is a flowchart illustrating a method of verifying the accuracy of a water-in-oil sensor and diagnosing a failure type of a transformer using the portable standard insulating oil storage and supply device of FIG. 1.

(S100) First, a standard insulating oil to be stored in a portable standard insulating oil storage and supply device is manufactured. As described above, the method of manufacturing the standard insulating oil may use the method disclosed in Korean Patent Publication No. 10-2011-0034904 (2011.04.06.). Considering the cleaning process, it is desirable to prepare about 1L of standard insulating oil.

(S200) Next, the standard insulating oil manufactured in the portable standard insulating oil storage and supply device is stored. Pour the standard insulating oil into the standard insulating oil container and close the standard insulating oil inlet with the storage cover.

(S300) Next, the portable standard insulating oil storage and supply device containing the standard insulating oil is transferred to the water-in-oil sensor to be verified or near the transformer to be diagnosed. There may be a temporal gap between storage and transport of the standard insulating oil, which may be a few days to weeks.

Subsequently, the storage cover of the portable standard insulating oil storage and supply device is replaced with a circulation cover.

One end of the supply line is connected to the oil in gas sensor, and the other end of the supply line is immersed in the standard insulation oil stored in the standard insulation oil container. One end of the return line is connected to the in-oil gas sensor, and the other end of the return line is connected to the exhaust connector.

(S600) Then wash the supply line and recovery line. Line cleaning is accomplished by supplying standard insulation oil through the supply line to the oil-in-water sensor and draining the standard insulation oil recovered through the return line to the drain connector. The flow of the standard insulating oil during the washing process will be described later with reference to FIG. 5.

(S700) Next, the discharge connector is separated from the recovery line, and the recovery line is connected to the standard insulating oil container to circulate the standard insulating oil to the oil in gas sensor. For accurate verification, the standard insulating oil stored in the standard insulating oil container and the standard insulating oil flowing through the supply or return line must be heated and maintained at a constant temperature during the circulation of the standard insulating oil.

And the accuracy is verified by detecting the indication value output from the oil-in-oil sensor. The circulation of the standard insulating oil is continuous, and the concentration of the standard insulating oil can be continuously measured in the oil in gas sensor.

Since the concentration of the standard insulation oil supplied to the oil-in-water sensor is known, the difference between the concentration of the standard insulation oil and the indication value output from the oil-in-water sensor means that the calibration of the oil-in-water sensor is necessary. The flow of the insulating oil while verifying the accuracy will be described later with reference to FIG. 6.

Based on the indication (S800), the portable standard insulating oil storage and supply system diagnoses the type of failure of the transformer. The readings of the readings are transferred via a data cable to portable standard insulating oil storage and supply. The failure type of the transformer is diagnosed according to an algorithm embedded in the data processing unit, and the result may be output to the data output unit.

FIG. 5 is a flow chart showing the flow of standard insulating oil during the line cleaning procedure in the method of FIG. 4.

The standard insulating oil (standard oil in Fig. 5) stored in a standard insulating oil container of a portable standard insulating oil storage and supply device (potable kit in Fig. 5) is supplied to the oil-in-water sensor (Fig. 5) through a supply line installed in a circulation cover during the line cleaning process. From the sensor). When the oil pump (oil pump in FIG. 5) is operated, the standard insulating oil is supplied to the valve of the supply line (in-line valve in FIG. 5), membrane (membrane in FIG. 5), mass flow meter (MFC in FIG. 5), oil pump. Passed sequentially and fed to the oil in gas sensor.

In this process, the flow rate per minute of the standard insulating oil can be kept constant by the mass flow meter. The flow rate is suitably around 100 mL per minute.

Standard insulating oil recovered from the oil-in-water sensor is discharged to the outside through a membrane (membrane in FIG. 5), a return line valve of the return line (out-line valve in FIG. 5), and an exhaust connector (waste out in FIG. 5).

The line cleaning process allows the release of air and contaminants in the supply and return lines.

FIG. 6 is a flow chart showing the flow of standard insulating oil during the detection of sensor readings and diagnosis of a failure type of a transformer in the method of FIG.

The rest of the process is the same as that of FIG. However, the standard insulating oil recovered through the return line is returned to the standard insulating oil container instead of being discharged to the outside through the discharge connector. And standard insulating oils continue to be mild in-oil sensor.

It is preferable that the unit hourly flow rate of the standard insulating oil supplied to the oil in gas sensor through the supply line during the circulation of the standard insulating oil is more than twice that of the line cleaning process. During the circulation of the standard insulating oil, the flow rate of the standard insulating oil is about 300 mL / min.

The portable standard insulating oil storage and supply apparatus described above, and the method of verifying the oil-in-water sensor and diagnosing a failure type of the transformer using the apparatus are not limited to the configuration and method of the above-described embodiments. All or some of the embodiments may be selectively combined to allow modifications to be made.

Claims (14)

A standard insulating oil container configured to store a standard insulating oil therein;
A standard insulating oil entrance formed in the standard insulating oil container;
A storage cover and a circulation cover which are formed to cover the standard insulating oil inlet and which are selectively detachably coupled around the standard insulating oil inlet and outlet;
A sealant formed in a ring shape so as to be mounted around the standard insulating oil entrance and exit and made of a copolymer; And
And a portable standard insulating oil storage including a supply line and a recovery line installed to penetrate the circulation cover and connected to the oil in gas sensor to circulate the standard insulating oil stored in the standard oil in oil container to the oil in gas sensor. Feeding device. The method of claim 1,
The storage cover,
An annular inner cover having a first portion inserted into the standard insulating oil entrance and a second portion bent from the first portion to be mounted around the standard insulating oil entrance; And
And an outer cover formed to cover the standard insulating oil inlet and surrounding the standard insulating oil inlet, the outer cover being coupled to the circumference of the standard insulating oil inlet with the inner cover interposed therebetween. The method of claim 2,
The circumference of the standard insulating oil entrance and exit is formed to protrude from one surface of the standard insulating oil container,
And the sealant is disposed between one surface of the standard insulating oil container and the outer cover. The method of claim 1,
The portable standard insulating oil storage and supply device,
A membrane covering the standard insulating oil entrance to prevent leakage of the standard insulating oil stored in the standard insulating oil container during circulation of the standard insulating oil;
A silicon support disposed to cover the membrane and formed to support the supply line or the recovery line; And
Comprising a polytetrafluoroethylene (polytetrafluoroethylene), further comprises a coating layer formed on the outer surface of the silicon support,
The membrane, the silicon support and the coating layer is disposed inside the circulation cover, the portable standard insulating oil storage and supply apparatus, characterized in that it has a hole for the penetration of the supply line or the recovery line. The method of claim 1,
The circulation cover is provided with a hole for penetrating the supply line or the recovery line,
The portable standard insulating oil storage and supply device further includes a leakage preventing portion formed to prevent leakage of the standard insulating oil between the supply line and the hole or between the recovery line and the hole.
The leak prevention unit,
A line coupling part extending along the supply line or the recovery line and formed to surround the supply line or the recovery line; And
And a leakage preventing film formed in an annular shape around the line coupling portion to cover the supply line and the hole, or to cover the recovery line and the hole. The method of claim 1,
The recovery line,
One end formed to be connected to the oil in gas sensor; And
It includes the other end formed on the opposite side of the one end,
The portable standard insulating oil storage and supply device further includes a discharge connector for discharging the standard insulating oil recovered through the recovery line to the outside,
Portable discharge oil storage and supply device, characterized in that the discharge connector is formed detachably on the other end. The method of claim 1,
The portable standard insulating oil storage and supply device,
A heater configured to heat a standard insulating oil stored in the standard insulating oil container; And
And a temperature control controller for controlling the heater to maintain the temperature of the standard insulating oil stored in the standard insulating oil container at the same temperature as that of the transformer. The method of claim 1,
The portable standard insulating oil storage and supply device further comprises a heating coil wound around the supply line and the return line. The method of claim 1,
The portable standard insulating oil storage and supply device,
A data transmission cable formed to be connectable to the oil in gas sensor and transferring data generated in the oil in gas sensor by circulating standard oil in the standard oil in oil container to the oil in gas sensor;
A data processor configured to diagnose a failure type of a transformer in which the oil-in-gas sensor is installed based on data received through the data transmission cable; And
And a data output unit configured to output a failure type of the transformer diagnosed by the data processing unit. The method of claim 1,
The portable standard insulating oil storage and supply device further comprises a case formed to be portable. Connecting a supply line and a recovery line installed in the circulation cover of the portable standard insulating oil storage and supply device to the oil in gas sensor, and connecting a discharge connector to the recovery line;
Supplying standard insulating oil to the oil in gas sensor through the supply line, and discharging the standard insulating oil recovered through the recovery line to the discharge connector to wash the supply line and the recovery line;
Separating the discharge connector from the recovery line and connecting the recovery line to a standard insulating oil container of a portable standard insulating oil storage and supply device to circulate the standard insulating oil stored in the standard insulating oil container to the oil in gas sensor;
Detecting an indication value output from the oil in gas sensor according to the circulation of the standard insulating oil; And
And diagnosing a failure type of a transformer in the portable standard insulating oil storage and supply device based on the indication value. The method of claim 11,
A portable standard, characterized in that the flow rate per unit time of the standard insulating oil supplied through the supply line in the circulating step is more than twice the flow rate per unit time of the standard insulating oil supplied through the supply line in the washing step. Method of verifying oil in gas sensor using insulation oil storage and supply device and diagnosing fault type of transformer. The method of claim 11,
The verification method of the oil-in-water sensor using the portable standard insulating oil storage and supply device and the failure type diagnosis method of the transformer are performed before the step of connecting the discharge connector.
Preparing a standard insulating oil;
Injecting the prepared standard insulating oil into a standard insulating oil container of a portable standard insulating oil storage and feeding device and closing the standard insulating oil entrance with a storage cover;
Transferring the portable standard insulating oil storage and supply device to a vicinity of the oil-in-water sensor to be verified or the transformer to be diagnosed; And
And replacing the storage cover with the circulation cover, the method of verifying the oil in gas sensor using a portable standard insulating oil storage and supply device and diagnosing a failure type of the transformer. The method of claim 11,
The circulating step is to maintain a constant temperature by heating the standard insulating oil stored in the standard insulating oil container and the standard insulating oil flowing through the supply line or the recovery line of the oil in gas sensor using a portable standard insulating oil storage and supply device How to verify and diagnose failure types of transformers.

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