WO2022205503A1 - Moisture absorption system of oil-filled apparatus, and operation control method for moisture absorption system - Google Patents

Abstract

A moisture absorption system of an oil-filled apparatus, the moisture absorption system comprising a main moisture absorber and an auxiliary moisture absorber; the tops of the main moisture absorber and the auxiliary moisture absorber are respectively in communication with a first path outlet and a second path outlet of a two-position three-way electromagnetic valve by means of pipelines; the bottoms of the main moisture absorber and the auxiliary moisture absorber are respectively in communication with a top ventilation opening of a moisture-proof valve by means of pipelines; the inside of the moisture-proof valve is provided with an air suction flow passage and an air discharge flow passage, and two ends of the air suction flow passage and two ends of the air discharge flow passage are respectively in communication with the top ventilation opening and a bottom ventilation opening of the moisture-proof valve; an air suction conduction one-way valve is arranged in the air suction flow passage; and an air discharge conduction one-way valve is arranged in the air discharge flow passage. The moisture absorption system of an oil-filled apparatus has the advantages of being maintenance-free, clean and environmentally friendly, and high reliability. Correspondingly, the present invention also provides an operation control method for the moisture absorption system of an oil-filled apparatus, which method can prevent a situation in which silica gel is treated when same still has a moisture absorption effect or the silica gel is not treated even after the silica gel has lost effectiveness, and makes the reliability of the system high.

Description

Moisture absorption system of oil-filled equipment and operation control method thereof technical field

The present application relates to a moisture-proof technology for oil-filled equipment, in particular to a moisture-absorbing system for oil-filled equipment such as transformers and reactors, and a method for controlling the operation of the moisture-absorbing system.

Background technique

Oil-filled equipment (devices), especially oil-filled electrical equipment, must be equipped with a moisture absorber. Most of the existing moisture absorbers rely on observing the discoloration of the discolored silica gel, humidity detection, and determining the regeneration time or replacement time of the silica gel by combining the humidity value with an algorithm. There is no specific quantification of the moisture absorption degree of the silica gel. Or the silica gel has failed but the silica gel has not been treated, resulting in waste or moisture absorption of oil products, resulting in deterioration of insulation. In addition, in the prior art, an electric heater is usually used for the regeneration and heating of the silica gel in the moisture absorber, which relies on thermal radiation to transfer heat during heating. There is a temperature gradient, and the heating is slow. The existence of porous adsorption molecular forces makes the water in the silica gel difficult to volatilize. -10 hours of processing time, long time, high power consumption, and long-term heating of the product, the various properties of the component materials will decline rapidly. In addition, the existing moisture absorber usually uses transformer oil to isolate the connection between the moisture absorber and the outside air when there is no breathing action, and the effect of isolating the air is good. It may also contaminate the silicone, rendering it ineffective.

technical problem

In view of the deficiencies of the prior art, the present application provides a moisture absorption system for oil-filled equipment. By using the moisture absorption system of the oil-filled equipment of the present application, it is possible to avoid the situation that the silica gel has been treated when it still has a moisture-absorbing effect, or the silica gel has failed but the silica gel has not been treated, and the oil-filled equipment of the present application is maintenance-free and clean. Environmental protection, and the advantages of high reliability. Correspondingly, the present application also provides an operation control method for the moisture absorption system of the oil-filled equipment. The moisture absorption system adopts the operation control method, which can avoid the occurrence of the silica gel has been processed when the moisture absorption effect is still present, or the silica gel has failed but the silica gel has not been treated. deal with the situation, and make the equipment operate with high reliability.

technical solutions

For the moisture absorption system, the specific technical solutions of the present application are as follows:

The moisture absorption system of the oil-filled equipment includes a main moisture absorber and an auxiliary moisture absorber; the tops of the main moisture absorber and the auxiliary moisture absorber are respectively connected with the first outlet and the second outlet of the two-position three-way solenoid valve through pipelines, The inlet of the two-position three-way solenoid valve is communicated with the breathing port on the oil pillow of the oil-filled equipment through the pipeline; the bottoms of the main moisture absorber and the auxiliary moisture absorber are respectively communicated with the top air port of a moisture isolation valve through the pipeline. The interior of the moisture barrier valve is provided with an inspiratory flow channel and an expiratory flow channel, and both ends of the inspiratory flow channel and the expiratory flow channel are respectively communicated with the top vent and the bottom vent of the moisture barrier; so The inhalation flow channel is provided with an upwardly open inhalation conduction check valve. When the oil-filled device inhales, the inhalation conduction check valve is opened; the exhalation flow channel is provided with a downwardly open one-way valve. The exhalation conduction one-way valve is opened when the oil-filled device exhales.

In the above moisture absorption system, the tops of the main moisture absorber and the auxiliary moisture absorber are respectively connected with the first outlet and the second outlet of the two-position three-way solenoid valve through the pipeline, and the inlet of the two-position three-way solenoid valve is connected with the charging port through the pipeline. The breathing port on the oil pillow of the oil equipment is connected, and the three-way solenoid valve can be energized when processing the moisture absorbing material in the main moisture absorber, and the system can be switched to the auxiliary moisture absorber. After the main moisture absorber is regenerated, it can be switched back to the main moisture absorber The moisture absorber works, so that the three-way solenoid valve is in a power-off state for most of the time, it is not easy to fail, and the reliability is high; When the equipment is not breathing, the moisture isolation valve is closed to isolate the communication between the inside of the moisture absorber and the outside air, so as to prevent the outside air from entering the moisture absorber and making the moisture-absorbing material damp. It enters the dehumidifier through the inhalation flow channel, and enters the oil pillow after drying. When the oil-filled equipment exhales, the exhalation conduction check valve is opened, and the gas is discharged to the outside through the exhalation flow channel. The moisture isolation valve replaces the traditional transformer oil to seal and isolate the outside world. It not only has a good air isolation effect, but also has no oil stains on the surface of the moisture absorber, which is clean and environmentally friendly.

As an optimization, in the aforementioned moisture absorption system of the oil-filled equipment, the main moisture absorber includes a vertically arranged cylindrical shell; a moisture absorption box is arranged inside the cylindrical shell, and the moisture absorption box is densely provided with ventilation holes, so The moisture absorption box is provided with color-changing silica gel and a temperature sensor for detecting the temperature of the color-changing silica gel; correspondingly, the interior of the cylindrical shell is also provided with a magnetron microwave heating device for heating the color-changing silica gel and a magnetron microwave heating device for heating the color-changing silica gel. For a weighing load cell, the top and bottom of the cylindrical shell are respectively provided with a first solenoid valve and a second solenoid valve; the structure of the auxiliary moisture absorber is the same as that of the main moisture absorber. Therefore, when the moisture absorber is working, when the weighing sensor detects that the water absorption of the silica gel in the moisture absorber reaches a certain set value, the silica gel can be heated by the magnetron microwave heating device, and the temperature of the silica gel can be detected by the temperature sensor. The temperature of the silica gel is controlled within the set range, so that the silica gel is dehydrated and regenerated. During the regeneration process, the first solenoid valve and the second solenoid valve are in the open state, the generated water vapor is discharged through the first solenoid valve, and the condensed water generated passes through the second solenoid valve. The solenoid valve is discharged. After the water absorption of the color-changing silica gel drops to a certain set value, the color-changing silica gel regeneration is completed, the magnetron microwave heating device stops heating, and the first solenoid valve and the second solenoid valve are closed. The silica gel regeneration is completed, and the regeneration process is only It takes dozens of minutes to complete.

As an optimization, in the aforementioned moisture absorption system of the oil-filled equipment, the moisture absorption box, the magnetron microwave heating device and the load cell are arranged in sequence from top to bottom, and the moisture absorption box and the magnetron microwave heating device exist circumferentially. Constrained, vertically movable in the gap with the top, the load cell is free to bear the weight of the magnetron microwave heating device and the hygroscopic box equipped with color-changing silica gel and temperature probe in the vertical direction. With the above structure, it is easy to implement and has the characteristics of high reliability.

Further, in the aforementioned moisture absorption system of the oil-filled equipment, the material of the moisture absorption box may be plastic.

Further, in the aforementioned moisture absorption system of the oil-filled equipment, the load cell may be a high temperature type bellows fully sealed load cell.

Further, in the aforementioned moisture absorption system of the oil-filled equipment, an insulating layer is provided between the magnetron microwave heating device and the load cell. By providing a thermal insulation layer, the performance of the load cell can be more stable over a long period of time.

Further, in the aforementioned moisture absorption system for oil-filled equipment, the first solenoid valve is connected to the elbow to form an outlet facing downward; the outlet of the second solenoid valve faces downward. The first solenoid valve is connected to the elbow outlet to prevent dust, moisture, etc. from accumulating at the outlet, and the second solenoid valve outlet faces downwards to facilitate drainage.

For the operation control method, the specific technical solutions of the present application are as follows:

The aforementioned operation control method of the moisture absorption system of the oil-filled equipment of the present application is: under normal circumstances, the two-position three-way solenoid valve is powered off, the main moisture absorber works, and the auxiliary moisture absorber does not work; When the water absorption of the color-changing silica gel reaches the first set threshold, the two-position three-way solenoid valve, the magnetron microwave heating device, the first solenoid valve, and the second solenoid valve are energized at the same time, the main moisture absorber stops working, and the auxiliary moisture absorber starts. Working, the magnetron microwave heating device heats the discolored silica gel in the main moisture absorber, and controls the heating temperature to 100-120 ℃, the water vapor produced is discharged through the first solenoid valve, and the condensed water produced is discharged through the solenoid valve at the bottom. , until the water absorption of the discolored silica gel in the main moisture absorber drops to the second set threshold, the magnetron microwave heating device, the first solenoid valve and the second solenoid valve lose power at the same time, and the magnetron microwave heating device stops heating, The first solenoid valve and the second solenoid valve are closed, and the regeneration of the discolored silica gel ends. After a delay of a set time, the residual water vapor after the silica gel regeneration is absorbed by the silica gel. The two-position three-way solenoid valve is powered off and switches to the main moisture absorber work; during the regeneration of the discolored silica gel in the main moisture absorber, if the water absorption of the discolored silica gel in the auxiliary moisture absorber reaches the first set threshold, after the regeneration of the discolored silica gel in the main moisture absorber is completed, it is switched back to the main moisture absorber to work. Regenerate the discolored silica gel in the auxiliary moisture absorber in the same way.

The moisture absorption system operates in the above method. The two-position three-way solenoid valve is not energized under normal circumstances. It is only energized during the regeneration of the silica gel in the main moisture absorber and during the delay period after regeneration. It is not easy to damage, has high reliability and has a long service life. Long, control the heating temperature of silica gel regeneration to 100-120 °C, which will not damage the silica gel, and the regeneration time is short, which can be completed in tens of minutes. After the silica gel regeneration in the main moisture absorber is completed, delay for a set time and then switch back The main moisture absorber works to prevent the residual water vapor from entering the oil pillow after the main moisture absorber completes the discoloration silica gel regeneration.

As an optimization, in the aforementioned operation control method of the moisture absorption system of the oil-filled equipment, the first set threshold may be 26% of the weight of the color-changing silica gel, and the second set threshold may be 26% of the weight of the color-changing silica gel. 2%.

As an optimization, in the aforementioned operation control method of the moisture absorption system of the oil-filled equipment, the set time does not exceed 30 minutes.

beneficial effect

To sum up, compared with the prior art, the beneficial technical effects obtained by the above-mentioned technical solutions of the present application are as follows:

1. The specific structure makes the moisture absorption system maintenance-free and highly reliable during operation;

2. The traditional transformer oil is sealed and isolated from the outside by setting a moisture-proof valve with a specific structure, which can effectively ensure the tightness, clean and environmental protection, and completely prevent the possible failure of silica gel pollution;

3. Use the weighing sensor to accurately measure the water absorption of the color-changing silica gel, and control the weight of the color-changing silica gel to ensure the moisture absorption effect of the silica gel, ensure that the water does not enter the transformer oil in the oil pillow, and ensure the insulation performance of the transformer oil;

4. The magnetron microwave heating device is used to replace the traditional electric heating device. During heating, the high-frequency reciprocating motion of the water molecules inside the silica gel generates "internal friction heat" to increase the temperature of the silica gel. The silica gel regeneration time is from 8-10 The hour is shortened to dozens of minutes, which greatly reduces the power consumption and prevents the rapid aging of the internal materials of the dehumidifier;

5. The specific operation control method provides a guarantee for the reliable operation of the moisture absorption system.

Description of drawings

Fig. 1 is the structural schematic diagram of the moisture absorption system of the oil-filled equipment of the application;

FIG. 2 is a schematic structural diagram of the moisture barrier valve in the application (closed state);

FIG. 3 is a schematic diagram of the structure of the moisture barrier valve in the present application (inhalation state);

FIG. 4 is a schematic diagram of the structure of the moisture barrier valve in the present application (exhalation state).

Markings in the drawings: 1-main moisture absorber, 101-cylindrical shell, 102-moisture absorption box, 103-insulation layer, 104-magnetron microwave heating device, 105-loading sensor, 106-first solenoid valve, 107-Second solenoid valve; 2-Auxiliary moisture absorber; 3-Two-position three-way solenoid valve; Road, 4021-exhalation conduction check valve; 5-oil pillow.

Embodiments of the present invention

The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings. However, it should not constitute a limitation to the technical solution of the present application. In the following specific embodiments, the contents not described in detail are common knowledge in the art.

In this specification, when there is no specific indication of whether it is a main moisture absorber or an auxiliary moisture absorber, the "moisture absorber" refers to either the main moisture absorber or the auxiliary moisture absorber.

In this application, the first outlet of the two-position, three-way solenoid valve 3 refers to the outlet that is opened when the power is turned off, and the second outlet of the two-position, three-way solenoid valve 3 refers to the outlet that is opened when the power is turned on.

The technical solutions of the present application will be further described below through specific examples.

Example 1:

1 and 2, in this embodiment, the moisture absorption system of the oil-filled device includes a main moisture absorber 1 and an auxiliary moisture absorber 2; the tops of the main moisture absorber 1 and the auxiliary moisture absorber 2 are connected to two The first outlet and the second outlet of the three-way solenoid valve 3 are connected, and the inlet of the two-position three-way solenoid valve 3 is connected to the breathing port on the oil pillow 5 of the oil-filled equipment through a pipeline; the main moisture absorber The bottoms of 1 and the auxiliary moisture absorber 2 are respectively communicated with the top vent of a moisture isolation valve 4 through pipelines; The two ends of the flow channel 401 and the expiratory flow channel 402 are respectively communicated with the top air port and the bottom air port of the moisture barrier valve 4; the inhalation flow channel 401 is provided with an upwardly open inhalation conduction check valve 4011, When the oil-filled device inhales, the inhalation conduction check valve 4011 is opened; the expiratory flow channel 402 is provided with an expiratory conduction check valve 4021 that opens downward. When the oil-filled device exhales, the The expiratory conduction check valve 4021 is opened.

During the working process, when the oil-filled equipment does not breathe due to the thermal expansion and contraction of the oil, the moisture isolation valve 4 is in the closed state as shown in Figure 2; when the oil-filled equipment inhales, the suction in the moisture isolation valve 4 The air conduction check valve 4011 is opened, and the moisture isolation valve 4 is in the inhalation state as shown in Figure 3; when the oil-filled device inhales, the exhalation check valve 4021 on the moisture isolation valve 4 is opened, and the moisture isolation valve 4021 is opened. The valve 4 is in an exhaled state as shown in FIG. 4 .

In this embodiment, the main moisture absorber 1 includes a vertical cylindrical casing 101; the cylindrical casing 101 is provided with a moisture absorption box 102, and the moisture absorption box 102 is densely provided with ventilation holes, and the moisture absorption The box 102 is provided with color-changing silica gel and a temperature sensor for detecting the temperature of the color-changing silica gel; correspondingly, the interior of the cylindrical housing 101 is also provided with a magnetron microwave heating device 104 for heating the color-changing silica gel and a magnetron microwave heating device 104 for heating the color-changing silica gel. For the load cell 105 for weighing, the top and bottom of the cylindrical housing 101 are respectively provided with a first solenoid valve 106 and a second solenoid valve 107 ; the structure of the auxiliary moisture absorber 2 is the same as that of the main moisture absorber 1 .

In this embodiment, the moisture absorption box 102, the magnetron microwave heating device 104 and the load cell 105 are arranged in order from top to bottom, and the moisture absorption box 102 and the magnetron microwave heating device 104 are constrained in the circumferential direction, The vertical direction can move in the gap with the top, and the load cell 105 can freely bear the weight of the magnetron microwave heating device 104 and the moisture absorption box 102 equipped with the color-changing silica gel and the temperature probe in the vertical direction.

In this embodiment, the material of the moisture absorption box 102 is plastic; the weighing sensor 105 is a high temperature type diaphragm box fully sealed weighing sensor with a rated temperature of 180°C; the magnetron microwave heating device 104 and all An insulating layer 103 is provided between the load cells 105 .

In this embodiment, the first solenoid valve 106 is connected to the elbow 1061 to form an outlet facing downward; the outlet of the second solenoid valve 107 faces downward.

In the working state, the moisture absorption system is connected with the control system, and the control system controls the operation of the relevant components.

In this embodiment, the operation control method of the moisture absorption system of the oil-filled equipment is as follows:

Under normal circumstances, the two-position three-way solenoid valve 3 is powered off, the main moisture absorber 1 works, and the auxiliary moisture absorber 2 does not work;

During operation, when the water absorption of the discolored silica gel in the main moisture absorber 1 reaches the first set threshold, the two-position three-way solenoid valve 3, the magnetron microwave heating device 104, the first solenoid valve 106, and the second solenoid valve 107 simultaneously When the power is turned on, the main moisture absorber 1 stops working, the auxiliary moisture absorber 2 starts to work, the magnetron microwave heating device 104 heats the discolored silica gel in the main moisture absorber 1, and the heating temperature is controlled to be 100-120 ℃, and the generated water vapor passes through The first solenoid valve 106 is discharged, and the generated condensed water is discharged through the solenoid valve at the bottom, until the water absorption of the discolored silica gel in the main moisture absorber 1 drops to the second set threshold, the magnetron microwave heating device 104, the first The solenoid valve 106 and the second solenoid valve 107 are de-energized at the same time, the magnetron microwave heating device 104 stops heating, the first solenoid valve 106 and the second solenoid valve 107 are closed, and the regeneration of the discolored silica gel is completed. The implementation is realized by an electronic delay relay), the residual water vapor after the silica gel regeneration is absorbed by the silica gel, the two-position three-way solenoid valve 3 is powered off, and the main moisture absorber 1 is switched back to work (the purpose of the delay switching is to prevent the main moisture absorber. 1 After the completion of the discoloration silica gel regeneration, the residual water vapor enters the oil pillow);

During the regeneration process of the discolored silica gel in the main moisture absorber 1, if the water absorption of the color-changing silica gel in the auxiliary moisture absorber 2 reaches the first set threshold, it will be switched back to the main moisture absorber 1 after the regeneration of the color-changing silica gel in the main moisture absorber 1 is completed. After that, regenerate the color-changing silica gel in the auxiliary moisture absorber 2 in the same way (after the regeneration of the color-changing silica gel in the auxiliary moisture absorber 2 is completed, the two-position three-way solenoid valve 3 does not switch).

In this embodiment, the first set threshold is 26% of the weight of the color-changing silica gel (the color-changing silica gel can absorb water up to more than 30% of its own weight, and the general failure critical point is 31-37%, and the technology of the present application is implemented. In the scheme, the first set threshold value can also be other values lower than the failure critical point, and the first set threshold value to trigger the regeneration of the color-changing silica gel in the main moisture absorber 1 and the color-changing silica gel in the auxiliary moisture absorber 2 can be selected. are not the same; the setting of the first setting valve that triggers the regeneration of the color-changing silica gel in the auxiliary moisture absorber 2 should ensure that the color-changing silica gel in the auxiliary moisture absorber 2 will not fail during the regeneration of the color-changing silica gel in the main moisture absorber 1). The second set threshold is 2% of the weight of the color-changing silica gel.

In this embodiment, the set time is 30 minutes.

Example 2:

Different from Embodiment 1, in this embodiment, the discolored silica gel in the main moisture absorber 1 is immersed in a xylitol solution; Saturated xylitol solution (can also be other concentrations during implementation), soak for 5min, take it out, carry out heating regeneration, wait for the color to return to the initial state, and then put it into the moisture absorption box 102; the set time is 10min. In this embodiment, the self-weight of the color-changing silica gel involved in the operation control method is the initial weight of the color-changing silica gel placed in the moisture absorption box 102 after the immersion treatment.

The discolored silica gel in the main moisture absorber is immersed in xylitol solution, which contains xylitol (the dried silica gel is placed in the xylitol solution, the silica gel will absorb water quickly, and the xylitol molecules will also enter the interior of the silica gel. In the micropore, after taking it out, it is heated and regenerated, the absorbed water volatilizes, and the xylitol remains inside the silica gel). ), the silica gel absorbs and regenerates the residual water vapor, and the absorbed water encounters xylitol to dissolve the xylitol, absorb heat, and play a cooling role, so that the residual water vapor that has not been absorbed condenses and is quickly absorbed by the silica gel. The delay time of restarting the main moisture absorber after the regeneration of the main moisture absorber is shortened, thereby shortening the power-on time of the two-position three-way solenoid valve, further reducing the failure rate of the two-position three-way solenoid valve, and improving the reliability of the system. After testing, in this embodiment, the delay time is set to 10min, so that the silica gel can fully absorb the water vapor remaining in the regeneration, and the delay time is shortened.

It should be pointed out that, when implementing the solution of the present application, the color-changing silica gel can be replaced by other hygroscopic materials that can be regenerated by heating and dehydration; Other logic work; the parameters (temperature, time, etc.) in the operation control method of the present application can also be selected with different values from the above-mentioned embodiments, as long as they are within the scope of the solution of the present application, the invention purpose of the present application can be achieved.

Claims (10)

A moisture absorption system for oil-filled equipment is characterized in that: it comprises a main moisture absorber (1) and an auxiliary moisture absorber (2); the tops of the main moisture absorber (1) and the auxiliary moisture absorber (2) are connected to two The first outlet and the second outlet of the three-way solenoid valve (3) are connected, and the inlet of the two-position three-way solenoid valve (3) is connected to the breathing port on the oil pillow (5) of the oil-filled equipment through a pipeline. ; The bottoms of the main moisture absorber (1) and the auxiliary moisture absorber (2) are respectively communicated with the top vent of a moisture isolation valve (4) through pipelines; the moisture isolation valve (4) is provided with suction inside A flow channel (401) and an expiratory flow channel (402), the two ends of the inspiratory flow channel (401) and the expiratory flow channel (402) are respectively connected with the top vent and the bottom vent of the moisture barrier valve (4). The suction channel (401) is provided with a suction conduction check valve (4011) that opens upward, and when the oil-filled equipment inhales, the suction conduction check valve (4011) is opened; so The expiratory flow channel (402) is provided with an exhalation conduction one-way valve (4021) that opens downward. When the oil-filled device exhales, the expiratory conduction one-way valve (4021) is opened. The moisture absorption system for oil-filled equipment according to claim 1, characterized in that: the main moisture absorber (1) comprises a vertical cylindrical casing (101); and a moisture absorption box is arranged inside the cylindrical casing (101). (102), the moisture absorption box (102) is densely provided with ventilation holes, and the moisture absorption box (102) is provided with color-changing silica gel and a temperature sensor for detecting the temperature of the color-changing silica gel; correspondingly, the cylindrical shell (101) is also provided with a magnetron microwave heating device (104) for heating the color-changing silica gel and a load cell (105) for weighing the color-changing silica gel. The top of the cylindrical shell (101) and the The bottom is respectively provided with a first solenoid valve (106) and a second solenoid valve (107); the structure of the auxiliary moisture absorber (2) is the same as that of the main moisture absorber (1). The moisture absorption system for oil-filled equipment according to claim 2, characterized in that: the moisture absorption box (102), the magnetron microwave heating device (104) and the load cell (105) are arranged in order from top to bottom, The moisture absorption box (102) and the magnetron microwave heating device (104) are constrained in the circumferential direction, and can move in the vertical direction within the gap with the top, and the load cell (105) is free to withstand the magnetron microwave in the vertical direction Weight of heating device (104) and hygroscopic box (102) containing color-changing silica gel and temperature probe. The moisture absorption system for oil-filled equipment according to claim 3, characterized in that: the material of the moisture absorption box (102) is plastic. The moisture absorption system for oil-filled equipment according to claim 3, characterized in that: the load cell (105) is a high temperature type bellows fully sealed load cell. The moisture absorption system for oil-filled equipment according to claim 5, characterized in that: an insulating layer (103) is provided between the magnetron microwave heating device (104) and the load cell (105). The moisture absorption system for oil-filled equipment according to claim 2, characterized in that: the first solenoid valve (106) is connected to the elbow (1061) to form a downward outlet; the second solenoid valve (107) has an outlet. Exit facing down. The operation control method of the moisture absorption system of the oil-filled equipment according to claim 2, characterized in that, it is: Under normal circumstances, the two-position three-way solenoid valve (3) is powered off, the main moisture absorber (1) works, and the auxiliary moisture absorber (2) does not work; During operation, when the water absorption capacity of the discolored silica gel in the main moisture absorber (1) reaches the first set threshold, the two-position three-way solenoid valve (3), the magnetron microwave heating device (104), the first solenoid valve (106) ) and the second solenoid valve (107) are energized at the same time, the main moisture absorber (1) stops working, the auxiliary moisture absorber (2) starts to work, and the magnetron microwave heating device (104) changes color in the main moisture absorber (1). The silica gel is heated, and the heating temperature is controlled to be 100-120°C. The water vapor produced is discharged through the first solenoid valve (106), and the condensed water produced is discharged through the solenoid valve at the bottom until the discolored silica gel in the main moisture absorber (1). When the water absorption drops to the second set threshold, the magnetron microwave heating device (104), the first solenoid valve (106) and the second solenoid valve (107) lose power at the same time, and the magnetron microwave heating device (104) The heating is stopped, the first solenoid valve (106) and the second solenoid valve (107) are closed, and the regeneration of the discolored silica gel is completed. After a delay of a set time, the residual water vapor after the silica gel regeneration is completed is absorbed by the silica gel. (3) Power off and switch to the main moisture absorber (1) again; During the regeneration of the color-changing silica gel in the main moisture absorber (1), if the water absorption of the color-changing silica gel in the auxiliary moisture absorber (2) reaches the first set threshold, the switch will be completed when the color-changing silica gel in the main moisture absorber (1) is regenerated. After returning to the main moisture absorber (1), regenerate the discolored silica gel in the auxiliary moisture absorber (2) in the same way. The operation control method of the moisture absorption system of the oil-filled equipment according to claim 8, wherein the first set threshold is 26% of the weight of the color-changing silica gel, and the second set threshold is the color-changing silica gel 2% of its own weight. The operation control method of the moisture absorption system of the oil-filled equipment according to claim 8, wherein the set time does not exceed 30 minutes.