TWM643641U - Intelligent drying device of transformer - Google Patents

Abstract

The invention discloses an intelligent drying device for a transformer, which includes an air moisture absorbing device and a control device. The air hygroscopic device is gas connected to a transformer and includes a device main body, a sensor and a heater. The device main body has desiccant, and the sensor and heater are arranged on the device main body. The control device is connected to the air moisture absorbing device and includes a display module. When in use, the air moisture absorption device can remove the moisture in the air through the desiccant when the transformer is in the intake state, and can remove the moisture absorbed by the desiccant through the heater when the transformer is in the exhaust state. In addition, the control device can judge a humidity state level according to the air humidity data obtained by the sensor and display it on the display module.

Description

Intelligent drying device for transformer

This creation relates to a power transmission and distribution system, in particular to an intelligent drying device for transformers.

Wet insulation of electrical equipment will lead to increased leakage current and dielectric loss, which is one of the main reasons for insulation breakdown failures. Therefore, it is necessary to prevent moist air from entering electrical equipment to ensure safe operation of electrical equipment. For example, an oil-immersed transformer is equipped with an oil storage tank for insulating oil. Once humid air enters the oil storage tank, the insulating oil will deteriorate due to the mixing of water and the insulation performance will be reduced.

In order to keep the interior of the electrical equipment dry, an air moisture absorption device is usually installed to absorb the moisture entering the air of the electrical equipment. The air moisture absorption device can use a desiccant to absorb moisture in the air, and use a heater to regenerate the desiccant. However, in the existing air moisture absorbing device, the heater is set to start after a certain time interval, or after it is determined that the desiccant absorbs water to be saturated or close to saturation, so it may not be possible to ensure that the air moisture absorbing device maintains a stable dehumidification performance throughout the operation of the electrical equipment.

Furthermore, the air in Taiwan in summer is relatively humid, and the time period for the desiccant to reach water absorption saturation is relatively short; in winter, the air is relatively dry, and the time period for the desiccant to reach water absorption saturation (close to saturation) is also relatively long. If the heater is turned on periodically to heat the desiccant according to a certain time interval, the desiccant may not be able to maintain the ability to absorb moisture in the air for a long time, and the insulation life of electrical equipment may be reduced. In addition, if you wait until the desiccant absorbs water to reach saturation or close to saturation before starting the heater, you need to bear the loss of shutting down the electrical equipment first.

In addition, the operation process of electrical equipment will also be affected by changes in external environmental factors, and the existing air moisture absorbing device does not have the ability to respond to changes in external environmental factors.

The technical problem to be solved in this creation is to provide an intelligent drying device for transformers, which can make the transformers operate normally through intelligent control of heaters.

In order to solve the above technical problems, one of the technical solutions adopted in this creation is to provide an intelligent drying device for transformers, which includes an air moisture absorbing device and a control device. The transformer has an intake state and an exhaust state. The air moisture absorption device is gas-communicated with the transformer. The air moisture absorption device includes a device body, a sensor and a heater, wherein the device body has a desiccant, and the sensor and the heater are arranged on the device body. The control device is connected to the air moisture absorbing device, and the control device includes a display module. When in use, the air moisture absorbing device can be configured to use the desiccant to remove moisture in the air when the transformer is in the air intake state, and obtain air humidity data within a predetermined period through the sensor; also, the air moisture absorbing device can be configured to remove moisture absorbed by the desiccant through the heater when the transformer is in the exhaust state; in addition, the control device can be configured to determine a humidity level based on the air humidity data within the predetermined cycle and display it on the display module.

In an embodiment of the present invention, the air humidity data includes the average value of the daily average humidity of all days in the predetermined period, and the humidity state grades are divided into four grades. When the average value is less than 30%, the humidity state level displayed on the display module is the first level; when the average value is greater than or equal to 30% and less than or equal to 45%, the humidity state level displayed on the display module is the second level; when the average value is greater than 45% and less than or equal to 60%, the humidity state level displayed on the display module is the third level; when the average value is greater than 60%, the humidity state level displayed on the display module is the fourth level.

In an embodiment of the present invention, the control device may be configured to display a first fault symbol on the display module when the temperature obtained by the sensor is higher than a predetermined temperature value.

In an embodiment of the present invention, the control device may be configured to display a second fault symbol on the display module when the humidity obtained by the sensor is higher than a predetermined humidity value.

In an embodiment of the present invention, the control device further includes a circuit board module, wherein the circuit board module includes a current sensing unit. Accordingly, the control device can be configured to display a third fault symbol on the display module when the current obtained by the current sensing unit is lower than a predetermined current value.

In an embodiment of the present invention, the control device can be configured to analyze the air humidity data in the past N days according to an algorithm, where N is an integer greater than or equal to 2, so as to obtain a predetermined number of countdown activation days of the heater and display it on the display module.

In an embodiment of the present invention, the device body includes a gas inlet end, a gas outlet end opposite to the gas inlet end, and a carrier located between the gas inlet end and the gas outlet end, the sensor is disposed at the gas outlet end, the carrier surrounds the heater, and the desiccant is disposed on the carrier.

In an embodiment of the present invention, the device body further includes a heat conduction structure, the heater is disposed on the heat conduction structure, and the carrier surrounds the heat conduction structure.

In an embodiment of the present invention, the heat conduction structure includes a plurality of integrated heat conduction plates, and the heater is disposed on one of the heat conduction plates.

In an embodiment of the present invention, the transformer is an oil-immersed transformer, which includes an oil storage tank, and an air bag is provided in the oil storage tank to isolate the insulating oil from the outside. In addition, the gas inlet end of the device main body communicates with the atmosphere, and the gas outlet end of the device main body communicates with the air bag.

The beneficial effect of this invention is that, in the intelligent drying device of this invention, by virtue of "the air moisture absorbing device is configured to remove the moisture in the air through the desiccant when the transformer is in the air intake state, and obtain air humidity data within a predetermined period through the sensor", "the air moisture absorbing device is configured to remove the moisture absorbed by the desiccant through the heater when the transformer is in the exhaust state" and "the control device is configured to judge a humidity level according to the air humidity data within the predetermined cycle And displayed on the display module" and other technical features, the air moisture absorbing device can maintain a stable dehumidification performance in each operation cycle of the transformer, and the control device can provide relevant personnel with current humidity status information, which is helpful to improve the availability rate of the transformer to a considerable extent.

Furthermore, the intelligent drying device of this creation can dynamically predict the timing of turning on the heater according to the daily changes in air humidity, so that the desiccant can be regenerated by heating before the desiccant absorbs water to saturation or close to saturation, even if the desiccant returns to its original water absorption and dehumidification capacity.

In order to further understand the characteristics and technical content of this creation, please refer to the following detailed description and drawings about this creation. However, the provided drawings are only for reference and explanation, and are not used to limit this creation.

The following is a description of the implementation of the "intelligent drying device for transformers" disclosed in this creation through specific specific examples. Those skilled in the art can understand the advantages and effects of this creation from the content disclosed in this specification. This creation can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the idea of this creation. In addition, the drawings of this creation are only for simple illustration, not according to the actual size of the depiction, prior statement. The following embodiments will further describe the relevant technical content of this creation in detail, but the disclosed content is not intended to limit the protection scope of this creation. In addition, the "or" used herein may include any one or a combination of multiple associated listed items depending on the actual situation.

Unless otherwise defined, terms used herein have the same meaning as commonly understood by those skilled in the art. The materials involved in each embodiment are commercially available or prepared according to the prior art unless otherwise specified. The operations or instruments involved in each embodiment are conventional operations or instruments in the art unless otherwise specified.

Please refer to Figure 1 to Figure 3, Figure 1 is the specific implementation architecture diagram of this creation, Figure 2 and Figure 3 are the use state diagrams of this creation. As shown in FIG. 1 to FIG. 3 , the embodiment of the present invention provides an intelligent drying device suitable for use with a transformer 1 to form a transformer system Z. The intelligent drying device of the invention includes an air moisture absorbing device 2 and a control device 3 , the air moisture absorbing device 2 is gas-connected to the transformer 1 , and the control device 3 is connected to the air moisture absorbing device 2 . When in use, the air moisture absorbing device 2 is an important protection component of the transformer 1, which can remove the moisture entrained in the external air before it is sucked into the transformer 1, so as to prevent the insulation strength of the transformer 1 from being lowered due to moisture; it is worth mentioning that the control device 3 can provide relevant personnel (such as technicians) with information on the current humidity status, which is helpful to improve the availability rate of the transformer 1 to a considerable extent.

Furthermore, the air moisture absorbing device 2 includes a device main body 21, a sensor 22 and a heater 23, wherein the device main body 21 has a desiccant D (such as a silica gel desiccant), and the sensor 22 and the heater 23 are arranged on the device main body 21; in addition, the control device 3 includes a display module 31. Accordingly, the air moisture absorbing device 2 can absorb and remove moisture in the air through the desiccant D when the transformer 1 is in the air intake state (absorbing external air), and obtain air humidity data within a predetermined period through the sensor 22 . In addition, the air moisture absorbing device 2 can use the heater 23 to heat and evaporate the moisture in the desiccant D when the transformer 1 is in the exhaust state (to exhale excess air inside). In addition, the control device 3 can judge and give the current humidity level of the air moisture absorbing device 2 according to the air humidity data obtained by the sensor 22 and display it on the display module 31 .

In practical application, the air humidity data may include the average value of the daily average humidity of all days in a predetermined period; in the example of taking every 10 days as a cycle, the air humidity data may include the average value of the daily average humidity of the air moisture absorbing device 2 from the nth day to the n+9th day of operation, where n is an integer greater than or equal to 1. In this creation, the humidity status level is divided into four levels: the first level, the average value is less than 30%, indicating that the current humidity state is excellent (Excellent); the second level, the average value is greater than or equal to 30% and less than or equal to 45%, indicating that the current humidity state is very good (Great); the third level, the average value is greater than 45% and less than or equal to 60%, indicating that the current humidity state is good (Good); and the fourth level, the average value is greater than 45% and less than or equal to 60%, indicating that the current humidity state needs attention (Check). It should be noted that this creation can make different divisions of humidity state levels according to different standards, and is not limited to the above examples.

In this embodiment, as shown in FIG. 2 and FIG. 3 , the transformer 1 is an oil-immersed transformer, which includes an oil storage tank 11, and an air bag A is provided in the oil storage tank 11 to isolate the insulating oil L from the outside world; one side of the air bag A communicates with the atmosphere through the air moisture absorption device 2, and the other side contacts the insulating oil L. In this paper, the suction state of the transformer 1 refers to the phenomenon that the air bag A absorbs air from the outside when the volume of the insulating oil in the oil storage tank 11 shrinks as the oil temperature decreases; the exhaust state of the transformer 1 refers to the phenomenon that the air bag A exhausts outward when the volume of the insulating oil in the oil storage tank 11 expands as the oil temperature rises.

Please refer to FIGS. 4 to 7. In the air moisture absorbing device 2, the device main body 21 mainly includes a gas inlet end 21a, a gas outlet end 21b opposite to the gas inlet end 21a, and a carrier 24 located between the gas inlet end 21a and the gas outlet end 21b; the gas inlet end 21a communicates with the atmosphere, and the gas outlet end 21b communicates with the air bag A through the pipe P. Carrier 24. In some embodiments, the oil storage tank 11 may not have the air bag A, and the gas outlet end 21b of the device main body 21 may communicate with the space on the oil surface. In addition, the sensor 22 is disposed at the gas outlet end 21b of the device main body 21, and the sensor 22 can simultaneously sense changes in temperature and humidity.

Specifically, when the transformer 1 is in the intake state, external air enters the main body 21 of the air moisture absorbing device 2 from the gas inlet end 21a and contacts the desiccant, and leaves from the gas outlet end 21b after the moisture contained in it is absorbed and removed by the desiccant, and then enters the oil storage tank 11 along the upper pipe P, during which the sensor 22 can continuously sense the temperature and humidity of the air. In addition, when the transformer 1 is in the exhaust state and the desiccant absorbs water to saturation or close to saturation, the heater 23 will be activated to heat and remove the moisture absorbed by the desiccant, so that the desiccant can restore the original water absorption and dehumidification capacity.

In order to improve the heating effect on the desiccant, as shown in FIG. 6 and FIG. 7 , the device main body 21 of the air moisture absorbing device 2 further includes a heat conducting structure 25 , the heater 23 is arranged on the heat conducting structure 25 , and the carrier 24 surrounds the heat conducting structure 25 . In actual application, the heat conduction structure 25 may include a plurality of heat conduction plates 251 integrated into one body, and the heater 23 is disposed on one of the heat conduction plates 251 . However, the above descriptions are only feasible implementation manners, and are not intended to limit the present invention.

It is worth mentioning that during the operation of the air moisture absorbing device 2, the sensor 22 or the heater 23 may malfunction and affect the normal operation of the air moisture absorbing device 2, so the control device 3 has a fault prompt function, so that relevant personnel (such as maintenance personnel) can quickly respond to the sensor 22 or heater 23 failure.

Furthermore, the control device 3 can display a first fault symbol on the display module 31 when the temperature obtained by the sensor 22 is higher than a predetermined temperature value (such as 80 ^o C), or can display a second fault symbol on the display module 31 when the humidity obtained by the sensor 22 is higher than a predetermined humidity value (such as 100%), so that relevant personnel know that the sensor 22 is faulty; the first fault symbol is for example ":" and the second fault symbol is ";", but the invention is not limited thereto.

In addition, as shown in FIG. 1 and FIG. 7 , the control device 3 may include a circuit board module 32 , wherein the circuit board module includes a current sensing unit 321 . Accordingly, the control device can display a third fault symbol on the display module when the current obtained by the current sensing unit 321 is lower than a predetermined current value (0.1 A), so that relevant personnel know that the heater 23 is faulty; the third fault symbol is for example "+", but the invention is not limited thereto.

According to actual needs, when the control device 3 prompts the fault message of the sensor 22 or the heater 23 through the display module 31 , it can also be combined with lighting or flashing of red, yellow or green lights.

In actual application, as shown in FIG. 1 , the circuit board module 32 further includes a processing unit 322 and a storage unit 323 to realize the above functions of the control device 3 . For example, the processing unit 322 can determine the humidity status level of the air moisture absorbing device 2 at the time of operation according to the air humidity data obtained by the sensor 22 (the average value of the daily average humidity of all days in a predetermined period), and control the display module 31 to display the humidity status level.

The processing unit 322 can be various processors or controllers, application-specific integrated circuits (ASICs), programmable logic devices, or other similar devices; the storage unit 323 can be a memory device or other suitable devices. However, the present invention is not limited to the examples mentioned above.

In this invention, the control device 3 can also intelligently control the heater 23 according to the air humidity data obtained by the sensor 22, that is, dynamically predict the timing of starting the heater 23 according to the daily change of the air humidity, as described in detail below. First, the processing unit 322 analyzes and processes the air humidity data in the past N days according to an algorithm. N is an integer greater than or equal to 2, and obtains the forecast reference value of the reciprocal start-up days of the heater 23. The algorithm is: Y(N)=α‧e^(β‧X(N))-(N-1)+K; wherein, Y(N) represents the forecast reference value of the Nth day; X(N) represents the daily average humidity increase rate of the Nth day; Obtained from the analysis of experimental data; K represents the weighted index. It should be noted that, when the air moisture absorbing device 2 is in a relatively humid environment, the weighting index K is positive; when the air moisture absorbing device 2 is in a relatively non-humid environment, the weighting index K is 0; when the air moisture absorbing device 2 is in a relatively dry environment, the weighting index K is negative.

In this embodiment, the calculation formula of the weighted index K is: e^(0.102H(N)); H(N) represents the daily average humidity of the Nth day. If the daily average humidity on the Nth day falls within the first humidity range, K is taken as a positive value, and the first humidity range can be 0% to 15%; if the Nth day’s daily average humidity falls within the second humidity range, K is taken as 0, and the second humidity range can be 16% to 24%; However, the present invention is not limited to the examples cited above.

The processing unit 322 can calculate the daily average humidity increase rate (subtract the daily average humidity of the previous day from the daily average humidity of the current day) from the second day of operation of the air moisture absorbing device 2, and obtain the daily forecast reference value from the second day according to the above algorithm. Then, the processing unit 322 obtains the countdown number of days to activate the heater 23 according to at least one forecast reference value, and the number of days can also be displayed on the display module.

In actual application, if it is the second day when the air moisture absorbing device 2 starts to operate, then the predicted reference value of the second day is used as the reciprocal number of days to start the heater 23 predicted on that day; if the air moisture absorbing device 2 starts to operate for more than 2 days, the processing unit 322 can obtain the reciprocal number of days to start the heater 23 after the second day when the air moisture absorbing device 2 starts to operate according to the following formula: It should be noted that the humidity of the environment where the air moisture absorbing device 2 is located will change with the weather every day, so the prediction results obtained by the processing unit 322 will also be different every day; it is possible that the prediction result obtained on one day is that the reciprocal start-up days of the heater 23 is 10 days (that is, the heater 23 needs to be started after 10 days), the prediction result obtained on the next day is that the reciprocal start-up days of the heater 23 is increased to 12 days, and the prediction result obtained on the next day is that the reciprocal start-up days of the heater 23 is reduced to 8 days.

The air moisture absorbing device 2 can work normally until the latest prediction result obtained by the processing unit 322 is that the reciprocal start-up days of the heater 23 is less than or equal to 1 day, and the processing unit 322 judges that the transformer 1 is in the exhaust state on the same day. After the above conditions are met, the processing unit 322 immediately starts the heater 23, and removes the moisture in the desiccant by heating. During the heating period, the remaining heating time can be displayed on the display module 31 .

In practical applications, the processing unit 322 can judge whether the transformer 1 is in the exhaust state according to the temperature data obtained by the sensor 22 in a plurality of consecutive fixed time periods, so as to reduce the influence of environmental factors (such as temperature recovery in the morning) on the judgment result; the temperature data can include multiple temperatures detected by the sensor 22 at preset time intervals (such as 20 seconds) and their average value. Further, when the average temperature of any fixed time period is greater than the average temperature of the previous fixed time period, and the difference between the average temperature of the last fixed time period and the average temperature of the first fixed time period is a predetermined value (such as 0.5 ^o C) or more, the processing unit 322 will determine that the transformer 1 is in the exhaust state.

In addition, if the heater 23 is idle for a long time (not activated), it must be activated forcibly to ensure the water absorption and dehumidification capacity of the desiccant. That is to say, when the heater 23 is idle for a certain number of days (such as 60 days), the heater 23 will be activated no matter whether the aforementioned conditions are met or not.

[Advantageous Effects of Embodiment]

The beneficial effect of the present invention is that, in the intelligent drying device of the present invention, by virtue of "the air moisture absorbing device is configured to remove the moisture in the air through the desiccant when the transformer is in the air intake state, and obtain air humidity data within a predetermined period through the sensor", "the air moisture absorbing device is configured to remove the moisture absorbed by the desiccant through the heater when the transformer is in the exhaust state" and "the control device is configured to judge a humidity state level according to the air humidity data within the predetermined period and Displayed on the display module” and other technical features, the air moisture absorbing device can maintain a stable dehumidification performance during each operation cycle of the transformer, and the control device can provide relevant personnel with current humidity status information, which is helpful to improve the availability rate of the transformer to a considerable extent.

Furthermore, the intelligent drying device of this creation can dynamically predict the timing of turning on the heater according to the daily changes in air humidity, so that the desiccant can be regenerated by heating before the desiccant absorbs water to saturation or close to saturation, even if the desiccant returns to its original water absorption and dehumidification capacity.

The content disclosed above is only a preferred feasible embodiment of this creation, and does not limit the scope of patent application for this creation. Therefore, all equivalent technical changes made by using the contents of the instructions and drawings of this creation are included in the scope of patent application for this creation.

Z: Transformer system 1: Transformer 11:Oil storage tank A: air bag L: insulating oil 2: Air moisture absorption device 21: The main body of the device 21a: gas inlet end 21b: Gas outlet end D: Desiccant 22: Sensor 23: Heater 24: carrier 25: Thermal conduction structure 251: heat conduction plate 3: Control device 31: Display module 32: Circuit board module 321: current sensing unit 322: processing unit 323: storage unit P: pipeline

Fig. 1 is a specific implementation structure diagram of an intelligent drying device for a transformer according to an embodiment of the invention.

FIG. 2 is a schematic view of one of the usage states of the intelligent drying device for transformers according to the embodiment of the present invention.

Fig. 3 is a schematic diagram of another usage state of the intelligent drying device for transformers according to the embodiment of the present invention.

FIG. 4 is a schematic three-dimensional assembly diagram of an intelligent drying device for transformers according to an embodiment of the present invention.

FIG. 5 is another perspective combined schematic view of the intelligent drying device for transformers according to the embodiment of the present invention.

FIG. 6 is an exploded perspective view of the three-dimensional part of the air moisture absorbing device used in the intelligent drying device of the transformer according to the embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of an intelligent drying device for a transformer according to an embodiment of the invention.

Z: Transformer system

1: Transformer

11:Oil storage tank

2: Air moisture absorption device

21: The main body of the device

D: Desiccant

22: Sensor

23: Heater

3: Control device

31: Display module

32: Circuit board module

321: current sensing unit

322: processing unit

323: storage unit

Claims (10)

An intelligent drying device for a transformer, the transformer has an intake state and an exhaust state, the intelligent drying device includes: transformer An air moisture absorption device, the gas is connected to the transformer, the air moisture absorption device includes a device body, a sensor and a heater, the device body has a desiccant, and the sensor and the heater are arranged on the device body; and A control device, connected to the air moisture absorbing device, the control device includes a display module; Wherein, the air moisture absorption device is configured to remove moisture in the air through the desiccant when the transformer is in the intake state, and obtain air humidity data within a predetermined period through the sensor; the air moisture absorption device is configured to remove moisture absorbed by the desiccant through the heater when the transformer is in the exhaust state; Wherein, the control device is configured to determine a humidity state level according to the air humidity data in the predetermined period and display it on the display module. The intelligent drying device for transformers according to claim 1, wherein the air humidity data includes the average value of the daily average humidity of all days in the predetermined period, and the humidity state level is divided into four levels; when the average value is less than 30%, the humidity state level displayed on the display module is the first level; when the average value is greater than or equal to 30% and less than or equal to 45%, the humidity state level displayed on the display module is the second level; when the average value is greater than 45% and less than or equal to 60%, the humidity level displayed on the display module The state level is the third level; when the average value is greater than 60%, the humidity state level displayed on the display module is the fourth level. The intelligent drying device for transformers as claimed in claim 1, wherein the control device is configured to display a first fault symbol on the display module when the temperature obtained by the sensor is higher than a predetermined temperature value. The intelligent drying device for a transformer according to claim 1, wherein the control device is configured to display a second fault symbol on the display module when the humidity obtained by the sensor is higher than a predetermined humidity value. The intelligent drying device for transformers as described in claim 1, wherein the control device further includes a circuit board module, the circuit board module includes a current sensing unit; the control device is configured to display a third fault symbol on the display module when the current obtained by the current sensing unit is lower than a predetermined current value. The intelligent drying device for transformers as described in Claim 1, wherein the control device is configured to analyze the air humidity data in the past N days according to an algorithm, where N is an integer greater than or equal to 2, so as to obtain a predetermined number of countdown start-up days of the heater and display it on the display module. The intelligent drying device for a transformer according to claim 1, wherein the device main body includes a gas inlet end, a gas outlet end opposite to the gas inlet end, and a carrier located between the gas inlet end and the gas outlet end, the sensor is arranged at the gas outlet end, the carrier surrounds the heater, and the desiccant is arranged on the carrier. The intelligent drying device for transformers according to claim 7, wherein the device main body further includes a heat conducting structure, the heater is arranged on the heat conducting structure, and the carrier surrounds the heat conducting structure. The intelligent drying device for transformers according to claim 8, wherein the heat conduction structure includes a plurality of heat conduction plates integrated into one body, and the heater is arranged on one of the heat conduction plates. The intelligent drying device for a transformer according to claim 7, wherein the transformer is an oil-immersed transformer, which includes an oil storage tank, and an air bag is provided in the oil storage tank to isolate the insulating oil from the outside; the gas inlet end of the device main body communicates with the atmosphere, and the gas outlet end of the device main body communicates with the air bag.

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