Transformer digital maintenance-free desiccant, control method and desiccant system

Abstract

The present application provides a digital maintenance-free desiccant for transformers, a control method and a desiccant system. The present invention adopts digital signal transmission technology to provide an implementation method of the digital maintenance-free desiccant for transformers, which can directly produce dry air and supply it to the air cavity of the transformer oil tank, so that the gas in the transformer oil tank is always in a dry state; at the same time, particle drying technology is adopted, and a heating plate is used to dry the desiccant particles to ensure that the desiccant particles are in a dry state. There is no need to manually replace the desiccant particles, which can ensure that the desiccant is in a maintenance-free state, effectively ensure the dry state in the transformer oil tank, and reduce the need for power outages when manually replacing desiccant particles, thereby reducing maintenance costs; the digital maintenance-free desiccant for transformers provided by the present invention solves the problem of gas reflux in the transformer oil tank, and can keep the gas in the transformer oil tank in a completely dry state.

Description

Technical Field

[0001] The present application relates to the technical field of transformer desiccant, and in particular to a digital maintenance-free desiccant for transformer, a control method and a desiccant system. Background Art

[0002] With the development of the power industry in China, the use of power transformers has also increased. As an important power equipment in the power system, the stable operation of power transformers plays a vital role in the stable supply of the entire power grid. As one of the key components of the transformer, the transformer desiccant is of great significance in ensuring the normal operation of the transformer and extending its service life.

[0003] Transformer desiccant is an indispensable component of transformer and is gradually maturing in technology. However, most transformer desiccant on the market are still in the state of manual judgment, relying on manual inspection to judge whether the transformer silica gel particles have changed color to determine whether the desiccant particles need to be replaced. If they change color, the silica gel particles inside the desiccant need to be replaced manually. This method requires removing the glass shell of the desiccant and filling it with silica gel particles, which is troublesome and costly to maintain. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a digital maintenance-free desiccant for transformers, a control method and a desiccant system, which are used to solve the problems of the prior art transformer desiccant that maintenance is troublesome and the maintenance cost is high due to the replacement of silica gel particles.

[0005] To achieve the above-mentioned objectives and other related objectives, the first aspect of the present application provides a digital maintenance-free desiccant for a transformer, comprising: a detection device, a desiccant device, a drying air device, and a control device; wherein: the detection device is connected to the transformer oil tank; the desiccant device is connected to the detection device, the drying air device, and the control device; the control device controls the desiccant device to perform a desiccant recovery operation on the gas, and / or the drying air device to replenish dry gas to the transformer oil tank based on the breathing state of the gas in the air cavity of the transformer oil tank and the humidity state of the gas in the desiccant device monitored in real time by the detection device, so as to keep the gas in the air cavity of the transformer oil tank dry.

[0006] In some embodiments of the first aspect of the present application, the detection device includes a breathing sensor, which is connected to the transformer oil tank through a ventilation tube, and is used to receive gas in the air cavity of the transformer oil tank and determine the breathing state of the gas; the breathing state includes an exhalation state and an inhalation state.

[0007] In some embodiments of the first aspect of the present application, the desiccant device is connected to the detection device through an outlet pipe and an inlet pipe, respectively. A first solenoid valve is provided on the outlet pipe, and a second solenoid valve is provided on the inlet pipe. If the gas is in an exhalation state, the first solenoid valve is controlled to open, and the gas in the air cavity of the transformer oil tank is discharged through the outlet pipe; if the gas is in an inhalation state, the second solenoid valve is controlled to open, and the transformer oil tank absorbs the gas after the desiccant device performs the desiccant operation and / or the dry gas supplemented by the drying air device through the inlet pipe.

[0008] In some embodiments of the first aspect of the present application, the desiccant device includes a desiccant cavity; a temperature and humidity sensor and filled silica gel particles are provided inside the desiccant cavity, and a heating plate is provided on the outside; wherein: the temperature and humidity sensor is used to monitor the humidity state of the gas in the desiccant device in real time; the silica gel particles are used to perform desiccant operations on the gas entering the desiccant cavity; the heating plate heats and dries the silica gel particles to keep the silica gel particles dry.

[0009] In some embodiments of the first aspect of the present application, the desiccant device further includes an exhaust pipe and a third solenoid valve; the third solenoid valve is arranged on the exhaust pipe; the third solenoid valve controls the exhaust pipe to discharge the water vapor and condensation generated by desiccant absorption out of the desiccant device.

[0010] In some embodiments of the first aspect of the present application, the dry air device includes a filter, a dehumidification component, and an air aspirator, wherein: the filter is used to receive the air and remove impurities in the air; the dehumidification component is used to dry and dehumidify the air after the impurities are removed to obtain dry gas; the air aspirator is used to absorb the dry gas and replenish the dry gas to the transformer oil tank through the dehumidification device.

[0011] In some embodiments of the first aspect of the present application, the dehumidification component includes an evaporator, a condenser, a compressor and a water tank; the condenser and the evaporator are arranged in parallel; the compressor is connected to the evaporator and the condenser respectively; the evaporator and the condenser are connected to the water tank respectively.

[0012] In some embodiments of the first aspect of the present application, the moisture absorption device further includes a display device; the display device receives and displays the breathing state and gas humidity state of the gas in the air cavity of the transformer oil tank transmitted by the control device.

[0013] To achieve the above-mentioned purpose and other related purposes, the second aspect of the present application provides a control method for a digital maintenance-free desiccant for a transformer, which is applied to a digital maintenance-free desiccant for a transformer, wherein the digital maintenance-free desiccant for a transformer comprises: a detection device, a desiccant device, a drying air device and a control device; the detection device is connected to the transformer oil tank; the desiccant device is connected to the detection device, the drying air device and the control device; the method comprises: obtaining the breathing state of the gas in the air cavity of the transformer oil tank and the humidity state of the gas in the desiccant device monitored in real time; based on the breathing state and the humidity state of the gas, controlling the desiccant device to perform a moisture recovery operation on the gas, and / or the drying air device to replenish dry gas to the transformer oil tank to keep the gas in the air cavity of the transformer oil tank dry.

[0014] To achieve the above-mentioned purpose and other related purposes, the third aspect of the present application provides a digital maintenance-free desiccant system for a transformer, comprising: the digital maintenance-free desiccant for the transformer as described above, and a transformer oil tank connected to the digital maintenance-free desiccant for the transformer; wherein, the control device of the digital maintenance-free desiccant for the transformer controls the desiccant device to perform a desiccant recovery operation on the gas, and / or the drying air device replenishes dry gas to the transformer oil tank, so as to keep the gas in the air cavity of the transformer oil tank dry.

[0015] As described above, the transformer digital maintenance-free desiccant, control method, and desiccant system of the present application have the following beneficial effects:

[0016] (1) The present invention adopts digital signal transmission technology, which can directly transmit the status of the transformer digital maintenance-free desiccant and the status of the transformer oil tank to the control device, and judge the health status of the desiccant and the transformer oil tank through the control device;

[0017] (2) The present invention uses the breathing sensor principle to determine whether the transformer oil tank is in the inhalation state or the exhalation state, and controls the solenoid valve to discharge gas or inhale gas based on the judgment result;

[0018] (3) The present invention adopts particle drying technology. When the hygroscopic particles in the desiccant change color or the humidity of the gas increases, the desiccant will automatically start to heat and dehumidify the hygroscopic particles, ensuring that the particles and gas are always in a dry state;

[0019] (4) The present invention adopts an intelligent drying gas function, which automatically produces dry gas and stores gas when air is needed, so that the desiccant can absorb dry gas on rainy days or in humid conditions, thereby avoiding frequent operation of the desiccant, reducing the loss of the desiccant, extending its service life, and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a structural schematic diagram of a digital maintenance-free desiccant for transformers in one embodiment of the present application.

[0021] Figure 2 Shown is a flow chart of a control method for a digital maintenance-free dehumidifying breather for a transformer in one embodiment of the present application.

[0022] Figure 3 Shown is a structural schematic diagram of a digital maintenance-free desiccant system for transformers in one embodiment of the present application.

[0023] Component number description

[0024] 1 Transformer oil tank

[0025] 2 Detection device

[0026] 21 Breathing sensor

[0027] 22 First solenoid valve

[0028] 23 Second solenoid valve

[0029] 3. Desiccant device

[0030] 31 Temperature and humidity sensor

[0031] 32 silica gel particles

[0032] 33 Heating Plate

[0033] 34 Third solenoid valve

[0034] 35 Display devices

[0035] 4 Dry air device

[0036] 41 filter

[0037] 42 Dehumidification components

[0038] 421 Evaporator

[0039] 422 Condenser

[0040] 423 Compressor

[0041] 424 water tank

[0042] 43 Inhaler

[0043] 5 Control device DETAILED DESCRIPTION

[0044] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0045] It should be noted that in the following description, reference is made to the accompanying drawings, which describe several embodiments of the present application. It should be understood that other embodiments may also be used, and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description should not be considered restrictive, and the scope of the embodiments of the present application is limited only by the claims of the published patents. The terms used herein are only for describing specific embodiments and are not intended to limit the present application. Spatially related terms, such as "upper", "lower", "left", "right", "below", "below", "lower", "above", "upper", etc., may be used in the text to facilitate the description of the relationship between one element or feature shown in the figure and another element or feature.

[0046] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," "holding," and the like should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0047] Furthermore, as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It should be further understood that the terms "comprise", "include" indicate the presence of the described features, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition occur only when the combination of elements, functions, or operations is inherently mutually exclusive in some way.

[0048] The present invention provides a digital maintenance-free desiccant for transformers, a control method, and a desiccant system. The present invention adopts digital signal transmission technology to provide a method for implementing the digital maintenance-free desiccant for transformers. Dry air can be directly produced and supplied to the air cavity of the transformer oil tank, thereby keeping the gas in the transformer oil tank in a dry state. At the same time, particle drying technology is adopted, using a heating plate to dry the desiccant particles, ensuring that the desiccant particles are in a dry state. Manual replacement of the desiccant particles is unnecessary, ensuring that the desiccant is in a maintenance-free state, effectively ensuring the dry state in the transformer oil tank, and reducing the need for power outages when manually replacing the desiccant particles, thereby reducing maintenance costs. The digital maintenance-free desiccant for transformers provided by the present invention solves the problem of gas backflow in the transformer oil tank, thereby keeping the gas in the transformer oil tank in a completely dry state.

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following embodiments and the accompanying drawings are used to further describe the technical solutions in the embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] To facilitate understanding of the embodiments of this application, first Figure 1 Detailed description. Figure 1 The following is a schematic diagram of the structure of a digital maintenance-free dehumidifier for transformers in an embodiment of the present application. The structure of the digital maintenance-free dehumidifier for transformers in this embodiment mainly includes: a detection device 2, a dehumidification device 3, a drying air device 4, and a control device 5. The detection device 2 is connected to the transformer oil tank 1; the dehumidification device 3 is connected to the detection device 2, the drying air device 4, and the control device 5.

[0051] The control device 5 controls the desiccant device 3 to perform a moisture recovery operation on the gas, and / or the drying air device 4 to replenish dry gas to the transformer tank 1, based on the breathing state of the gas in the air cavity of the transformer tank 1 and the humidity state of the gas in the desiccant device 3 monitored in real time by the detection device 2, so as to keep the gas in the air cavity of the transformer tank 1 dry.

[0052] The digital maintenance-free desiccant for transformers in the present invention adopts digital signal transmission technology, and receives the breathing state of the gas in the air cavity of the transformer oil tank 1 and the gas state in the desiccant device 3 transmitted by the desiccant device 3 through the control device 5, and uses this to judge the health status of the digital maintenance-free desiccant for transformers and the transformer oil tank 1.

[0053] It should be noted that, in the embodiment of the present invention, the desiccant device 3 and the dry air device 4 are used. When the transformer tank 1 absorbs air, if the dry gas recovered by the desiccant device 3 and filled into the transformer tank 1 is insufficient, the dry air device 4 is used to replenish the remaining dry gas to the transformer tank 1, thereby ensuring that the gas in the air cavity of the transformer tank 1 is always kept dry.

[0054] In one embodiment, the detection device 2 includes a breathing sensor 21, which is connected to the transformer oil tank 1 through a ventilation pipe, and is used to receive the gas in the air cavity of the transformer oil tank 1 and determine the breathing state of the gas; the breathing state includes an exhalation state and an inhalation state.

[0055] In this embodiment, a vent is provided on the transformer tank 1, and the vent is used for the gas in the transformer tank 1 to take in and out under the action of thermal expansion and contraction. At the same time, the vent is inserted into a vent pipe, one end of the vent is connected to the vent of the transformer tank 1, and the other end is connected to the breathing sensor 21 in the detection device 2, so that the gas in the transformer tank 1 can be discharged through the vent pipe or the gas can be filled into the air cavity of the transformer tank 1.

[0056] For example, when the temperature of the transformer oil in the transformer tank 1 rises, the transformer oil expands. At this time, the gas in the air cavity of the transformer tank 1 is discharged outward through the vent hole, which is in the exhalation state; when the temperature of the transformer oil in the transformer tank 1 drops, the volume of the transformer oil decreases. At this time, the gas in the air cavity of the transformer tank 1 is insufficient, and the transformer tank 1 needs to absorb dry gas, that is, it is in the intake state.

[0057] In the present invention, the detection device 2 is provided with a breathing sensor 21. Therefore, the principle of the breathing sensor 21 is used to determine whether the transformer oil tank 1 is in the inhalation state or the exhalation state. The control device 5 receives the breathing state information of the transformer oil tank 1 and makes a judgment. The exhaust and inhalation operations of the transformer oil tank 1 can be controlled according to the judgment result.

[0058] In one embodiment, the desiccant device 3 is connected to the detection device 2 through an outlet pipe and an inlet pipe, respectively. A first solenoid valve 22 is provided on the outlet pipe, and a second solenoid valve 23 is provided on the inlet pipe. When the gas is in an exhalation state, the first solenoid valve 22 is controlled to open, and the gas in the air cavity of the transformer oil tank 1 is discharged through the outlet pipe. When the gas is in an inhalation state, the second solenoid valve 23 is controlled to open, and the transformer oil tank 1 absorbs the gas after the desiccant device 3 performs the desiccant operation and / or the dry gas supplemented by the drying air device 4 through the inlet pipe.

[0059] The moisture absorption device 3 of the present invention exhausts and inhales the transformer oil tank 1 respectively through the air outlet pipeline and the air inlet pipeline, that is, the exhaust and inhalation are separated, which can avoid the gas in the air cavity of the transformer oil tank 1 being mixed due to the gas entering and exiting through the same path, making it difficult to keep the gas in the air cavity dry.

[0060] Furthermore, the desiccant device 3 is connected to the breathing sensor 21 of the detection device 2 through an outlet pipe and an inlet pipe, and the breathing sensor 21 is connected to the transformer oil tank 1 through a ventilation pipe. Therefore, the exhalation and inhalation of the transformer oil tank 1 must be distinguished and cannot be carried out at the same time. At this time, a first solenoid valve 22 is provided on the outlet pipe, and a second solenoid valve 23 is provided on the inlet pipe. When the breathing sensor 21 detects that the transformer oil tank 1 is exhaling, the first solenoid valve 22 on the outlet pipe is controlled to open, the outlet pipe is connected, and the air is exhausted to the desiccant device 3; when the breathing sensor 21 detects that the transformer oil tank 1 is inhaling, the second solenoid valve 23 on the inlet pipe is controlled to open, the inlet pipe is connected, and dry gas is filled into the transformer oil tank 1.

[0061] In this embodiment, dry gas is filled into the transformer tank 1. The dry gas may be the gas discharged from the transformer tank 1 after the desiccant device 3 absorbs moisture, or the dry air device 4 is turned on to inject dry air when the gas in the desiccant device 3 is insufficient. When the gas in the air cavity of the transformer tank 1 is sufficient, the control device 5 controls the dry air device 4 to be closed and stops injecting dry air.

[0062] In one embodiment, the desiccant device 3 includes a desiccant cavity; a temperature and humidity sensor 31 and filled silica gel particles 32 are provided inside the desiccant cavity, and a heating plate 33 is provided on the outside; wherein: the temperature and humidity sensor 31 is used to monitor the humidity state of the gas in the desiccant device 3 in real time; the silica gel particles 32 are used to perform desiccant operation on the gas entering the desiccant cavity; the heating plate 33 heats and dries the silica gel particles 32 to keep the silica gel particles 32 dry.

[0063] The present invention utilizes a temperature and humidity sensor 31 built into the moisture absorption cavity to monitor the humidity of the gas within it in real time. Based on this humidity, the absorption and drying of the gas within the cavity can be controlled. If the humidity does not meet the requirements for dry gas, silica gel particles 32 within the cavity absorb the moisture from the gas entering the cavity, thereby reducing the humidity until the humidity meets the requirements for dry gas.

[0064] In this embodiment, when the silica gel particles 32 in the moisture absorption cavity absorb moisture from the gas, the silica gel particles 32 will change color or detect an increase in the humidity of the gas. At this time, the heating plate 33 outside the moisture absorption cavity will be automatically started. The heating plate 33 dries and dehumidifies the silica gel particles 32 and the gas, thereby ensuring that the silica gel particles 32 and the gas are always in a dry state.

[0065] The present invention adopts particle drying technology. By using a heating plate 33 combined with silica gel particles 32, dry air is directly produced and supplied to the air cavity of the transformer oil tank 1. The gas in the transformer oil tank 1 can be kept dry at all times. Moreover, the heating plate 33 can dry the silica gel particles 32 in real time, so there is no need to manually replace the silica gel particles 32. At the same time, it also reduces the need for power outages when manually replacing the silica gel particles 32, thereby achieving maintenance-free desiccant and reducing maintenance costs.

[0066] In one embodiment, the desiccant device 3 further includes an exhaust pipe and a third solenoid valve 34 ; the third solenoid valve 34 is disposed on the exhaust pipe; the third solenoid valve 34 controls the exhaust pipe to discharge water vapor and condensation generated by desiccant absorption out of the desiccant device 3 .

[0067] It should be noted that water vapor and condensation will be generated during the process of the desiccant device 3 absorbing moisture from the gas. When water vapor and condensation are monitored, the control device 5 will control the third solenoid valve 34 to open, connect the exhaust pipe, and discharge the water vapor and condensation out of the desiccant device 3, so that the desiccant device 3 always remains dry.

[0068] In one embodiment, the dry air device 4 includes a filter 41, a dehumidification component 42, and an air aspirator 43, wherein: the filter 41 is used to receive the air and remove impurities in the air; the dehumidification component 42 is used to dry and dehumidify the air after the impurities are removed to obtain dry gas; the air aspirator 43 is used to absorb the dry gas and replenish the dry gas to the transformer oil tank 1 through the dehumidification device 3.

[0069] In a specific embodiment, the dehumidification component 42 includes an evaporator 421, a condenser 422, a compressor 423 and a water tank 424; the condenser 422 and the evaporator 421 are arranged in parallel; the compressor 423 is connected to the evaporator 421 and the condenser 422 respectively; the evaporator 421 and the condenser 422 are connected to the water tank 424 respectively.

[0070] For example, when the transformer tank 1 is in the air intake state, there are three situations:

[0071] Case 1: The moisture in the gas discharged from the transformer tank 1 is recovered by the moisture absorption device 3 and then absorbed by the transformer tank 1;

[0072] Scenario 2: The gas recovered after moisture absorption in the moisture absorption device 3 does not meet the gas storage capacity in the air cavity of the transformer oil tank 1. The moisture absorption device 3 starts the air absorption state and absorbs the dry air obtained by the dry air device 4 to supplement the transformer oil tank 1.

[0073] Scenario 3: There is no gas in the moisture absorption device 3 , and the moisture absorption device 3 starts the air absorption state, absorbing the dry air obtained by the dry air device 4 to supplement the transformer oil tank 1 .

[0074] It should be noted that the dry air device 4 in the present invention automatically absorbs the air around the transformer oil tank 1. After absorbing the air, the dry air device 4 removes impurities in the air through the filter 41, and then dehumidifies the air after the impurities are removed through the dehumidification component 42 to obtain dry air, and sends the dry air to the moisture absorption device 3. When enough dry air is rushed in, the system will be shut down, and the temperature and humidity sensor 31 will judge the dryness of the dry gas. If the drying requirements are met, the second solenoid valve 23 will be opened to rush the dry air that meets the drying requirements into the transformer oil tank 1.

[0075] The patent of the present invention adopts an intelligent drying gas function. When air is needed, dry gas will be automatically produced and stored through the drying air device 4, so that the desiccant can absorb dry gas on rainy days or in humid conditions, which can avoid the frequent operation of the desiccant, reduce the loss of the desiccant, extend the service life, and reduce maintenance costs.

[0076] In one embodiment, the moisture absorption device 3 further includes a display device 35; the display device 35 receives and displays the respiration state and humidity state of the gas within the gas cavity of the transformer oil tank 1 transmitted by the control device 5. The display device 35 may also be equipped with a user interface, allowing operators to perform conventional interactive operations, such as adjusting display parameters and setting alarm thresholds. This allows operators to promptly detect abnormal conditions and take preventive measures to avoid potential equipment damage or safety accidents.

[0077] In this embodiment, after the control device 5 uses digital signal transmission technology to receive the breathing state and gas humidity state of the gas in the air cavity of the transformer oil tank 1, the breathing state and gas humidity state can also be transmitted to the display device 35 on the desiccant device 3 for display, so that the staff can intuitively view the status of the transformer oil tank 1 and the status of the desiccant in real time, thereby improving monitoring efficiency and reducing maintenance costs.

[0078] like Figure 2 As shown, a flow chart of a control method of a digital maintenance-free dehumidifying breather for transformers in an embodiment of the present invention is shown. In this embodiment, the control method of the digital maintenance-free dehumidifying breather for transformers is applied to any of the digital maintenance-free dehumidifying breathers for transformers described above. Figure 1 As shown, the transformer digital maintenance-free desiccant includes: a detection device 2, a desiccant device 3, a drying air device 4 and a control device 5; the detection device 2 is connected to the transformer oil tank 1; the desiccant device 3 is connected to the detection device 2, the drying air device 4 and the control device 5.

[0079] Specifically, the control method of the transformer digital maintenance-free desiccant includes:

[0080] Step S21: obtaining the breathing state of the gas in the air cavity of the transformer oil tank 1 and the humidity state of the gas in the moisture absorption device 3 monitored in real time;

[0081] Step S22: Based on the breathing state and the humidity state of the gas, the desiccant device 3 is controlled to perform a moisture recovery operation on the gas, and / or the drying air device 4 is controlled to replenish dry gas to the transformer tank 1, so that the gas in the air cavity of the transformer tank 1 remains dry.

[0082] It should be noted that the control method of the transformer digital maintenance-free desiccant provided in the above embodiment belongs to the same concept as the transformer digital maintenance-free desiccant embodiment. Its specific implementation process is detailed in the transformer digital maintenance-free desiccant embodiment and will not be repeated here.

[0083] like Figure 3 The figure shows a schematic diagram of the structure of a digital maintenance-free dehumidification system for transformers according to an embodiment of the present invention. In this embodiment, the digital maintenance-free dehumidification system for transformers includes: a digital maintenance-free dehumidification breather for transformers as described in any of the above items; and a transformer oil tank 1 connected to the digital maintenance-free dehumidification breather. The control device 5 of the digital maintenance-free dehumidification breather controls the dehumidification device 3 to absorb and recover moisture from the gas, and / or the drying air device 4 replenishes dry gas to the transformer oil tank 1, thereby maintaining dryness within the gas cavity of the transformer oil tank 1.

[0084] In a specific embodiment, an air hole is required to be opened at the top of the transformer oil storage cabinet for use as air inlet and outlet. When the breathing sensor 21 detects that the transformer is exhaling, the first solenoid valve 22 opens to discharge gas to the desiccant device 3. If too much gas is discharged, the third solenoid valve 34 of the desiccant device 3 opens to discharge excess gas and condensation generated during the desiccant absorption process. When the desiccant device 3 inhales air, the drying air device 4 will rush air into the desiccant device 3. When sufficient dry air is filled, the drying air device 4 is closed, and the temperature and humidity sensor 31 will judge the dryness of the gas. If the drying requirements are met, the second solenoid valve 23 will be opened to rush air into the transformer oil tank 1.

[0085] It should be emphasized that the purpose of the present invention is to provide a method for implementing a digital, maintenance-free desiccant for transformers. This method can directly generate dry air and supply it to the air cavity of the transformer oil tank, keeping the gas in the transformer oil tank in a constant dry state. Furthermore, without the need for manual replacement of the desiccant particles, the desiccant can be maintained in a maintenance-free state, effectively ensuring the dry state within the transformer oil tank, reducing the need for power outages required for manual replacement of silica gel particles, and saving product maintenance costs. Furthermore, the digital, maintenance-free desiccant for transformers provided by the present invention solves the problem of gas backflow in the transformer oil tank, keeping the gas in the transformer oil tank in a completely dry state.

[0086] In summary, the present application provides a digital maintenance-free desiccant for transformers, a control method, and a desiccant system, comprising a detection device, a desiccant device, a drying air device, and a control device; the detection device is connected to the transformer oil tank; the desiccant device is connected to the detection device, the drying air device, and the control device; the control device controls the desiccant device to perform a desiccant recovery operation on the gas, and / or the drying air device to replenish dry gas to the transformer oil tank based on the breathing state of the gas in the air cavity of the transformer oil tank and the humidity state of the gas in the desiccant device monitored in real time by the detection device, so as to keep the gas in the air cavity of the transformer oil tank dry. The present invention adopts digital signal transmission technology and provides an implementation method of a digital maintenance-free desiccant for transformers, which can directly produce dry air and provide it to the air cavity of the transformer oil tank, so that the gas in the transformer oil tank is always in a dry state; at the same time, particle drying technology is adopted, and a heating plate is used to dry the desiccant particles to ensure that the desiccant particles are in a dry state. There is no need to manually replace the desiccant particles, which can ensure that the desiccant is in a maintenance-free state, effectively ensure the dry state in the transformer oil tank, and reduce the need for power outages when manually replacing the desiccant particles, thereby reducing maintenance costs; the digital maintenance-free desiccant for transformers provided by the present invention solves the problem of gas reflux in the transformer oil tank, and can keep the gas in the transformer oil tank in a completely dry state.

[0087] The present invention adopts digital signal transmission technology, which can directly transmit the status of the transformer digital maintenance-free desiccant and the status of the transformer oil tank to the control device, and judge the health status of the desiccant and the transformer oil tank through the control device; the present invention adopts the principle of breathing sensor to judge whether the state of the transformer oil tank is in the inhalation state or the exhalation state, and controls the solenoid valve to discharge gas or inhale gas based on the judgment result; the present invention adopts particle drying technology, when the hygroscopic particles in the desiccant change color or the humidity of the gas increases, it will automatically start to heat and dehumidify the hygroscopic particles, ensuring that the particles and gas are always in a dry state; the present invention adopts an intelligent drying gas function, which automatically produces dry gas and stores gas when inhalation is required, so that the desiccant can absorb dry gas on rainy days or in humid conditions, which can avoid the frequent operation of the desiccant, reduce the loss of the desiccant, extend the service life, and reduce maintenance costs. Therefore, the present application effectively overcomes the various shortcomings of the prior art and has high industrial utilization value.

[0088] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed in this application shall be covered by the claims of this application.

Claims

1. A digital maintenance-free desiccant for transformers, characterized in that: include: Detection device, moisture absorption device, drying air device and control device; wherein: The detection device is connected to the transformer oil tank; the moisture absorption device is connected to the detection device, the drying air device and the control device; The control device controls the moisture absorption device to absorb moisture and recover the gas, and / or the drying air device to replenish dry gas to the transformer tank, based on the breathing state of the gas in the air cavity of the transformer tank and the humidity state of the gas in the moisture absorption device monitored in real time by the detection device, so as to keep the gas in the air cavity of the transformer tank dry. The breathing state includes an exhalation state and an inhalation state. The dry air device replenishes dry air to the transformer tank, comprising: When the gas recovered after moisture absorption in the moisture absorption device does not meet the gas storage capacity in the air cavity of the transformer oil tank, the moisture absorption device starts the air absorption state and absorbs the dry air obtained by the dry air device to supplement the transformer oil tank; There is no gas in the desiccant device, the desiccant device starts the air absorption state, and absorbs the dry air obtained by the dry air device to supplement the transformer tank; The dry air device includes a filter, a dehumidification component, and an air aspirator, wherein: the filter is used to receive the air and remove impurities in the air; the dehumidification component is used to dry and dehumidify the air after the impurities are removed to obtain dry gas; the air aspirator is used to absorb the dry gas and replenish the dry gas to the transformer tank through the dehumidification device; The desiccant device is connected to the detection device via an outlet pipe and an inlet pipe, respectively. A first solenoid valve is provided on the outlet pipe, and a second solenoid valve is provided on the inlet pipe. When the gas is in an exhalation state, the first solenoid valve is controlled to open, and the gas in the air cavity of the transformer oil tank is discharged through the outlet pipe. When the gas is in an inhalation state, the second solenoid valve is controlled to open, and the transformer oil tank absorbs the gas after the desiccant device performs a desiccant operation and / or the dry gas supplemented by the drying air device through the inlet pipe.

2. The transformer digital maintenance-free desiccant according to claim 1 is characterized in that: The detection device includes a breathing sensor, which is connected to the transformer oil tank through a ventilation pipe and is used to receive gas in the air cavity of the transformer oil tank and determine the breathing state of the gas; the breathing state includes an exhalation state and an inhalation state.

3. The transformer digital maintenance-free desiccant according to claim 1, characterized in that: The moisture absorption device includes a moisture absorption cavity; a temperature and humidity sensor and silica gel particles are provided inside the moisture absorption cavity, and a heating plate is provided outside the cavity; wherein: The temperature and humidity sensor is used to monitor the humidity of the gas in the moisture absorption device in real time; The silica gel particles are used to absorb moisture from the gas entering the moisture absorption cavity; The heating plate heats and dries the silica gel particles to keep the silica gel particles dry.

4. The transformer digital maintenance-free desiccant according to claim 3 is characterized in that: The desiccant device further comprises an exhaust pipe and a third solenoid valve; the third solenoid valve is arranged on the exhaust pipe; the third solenoid valve controls the exhaust pipe to discharge the water vapor and condensation generated by desiccant absorption out of the desiccant device.

5. The transformer digital maintenance-free desiccant according to claim 1, characterized in that: The dehumidification component includes an evaporator, a condenser, a compressor and a water tank; the condenser and the evaporator are arranged in parallel; the compressor is connected to the evaporator and the condenser respectively; the evaporator and the condenser are connected to the water tank respectively.

6. The transformer digital maintenance-free desiccant according to claim 1, characterized in that: The moisture absorption device further includes a display device; the display device receives and displays the breathing state and gas humidity state of the gas in the air cavity of the transformer oil tank transmitted by the control device.

7. A control method for a digital maintenance-free desiccant for a transformer, characterized in that: A digital maintenance-free desiccant for transformers is provided. The digital maintenance-free desiccant for transformers comprises: a detection device, a desiccant device, a drying air device, and a control device; the detection device is connected to the transformer oil tank; the desiccant device is connected to the detection device, the drying air device, and the control device; the method comprises: Acquire the breathing state of the gas in the air cavity of the transformer oil tank and the humidity state of the gas in the moisture absorption device monitored in real time; Based on the breathing state and the humidity state of the gas, controlling the moisture absorption device to perform a moisture absorption and recovery operation on the gas, and / or controlling the drying air device to replenish dry gas to the transformer tank, so as to keep the gas in the air cavity of the transformer tank dry; the breathing state includes an exhalation state and an inhalation state; The dry air device replenishes dry air to the transformer tank, comprising: When the gas recovered after moisture absorption in the moisture absorption device does not meet the gas storage capacity in the air cavity of the transformer oil tank, the moisture absorption device starts the air absorption state and absorbs the dry air obtained by the dry air device to supplement the transformer oil tank; There is no gas in the desiccant device, the desiccant device starts the air absorption state, and absorbs the dry air obtained by the dry air device to supplement the transformer tank; The dry air device includes a filter, a dehumidification component, and an air aspirator, wherein: the filter is used to receive the air and remove impurities in the air; the dehumidification component is used to dry and dehumidify the air after the impurities are removed to obtain dry gas; the air aspirator is used to absorb the dry gas and replenish the dry gas to the transformer tank through the dehumidification device; The desiccant device is connected to the detection device via an outlet pipe and an inlet pipe, respectively. A first solenoid valve is provided on the outlet pipe, and a second solenoid valve is provided on the inlet pipe. When the gas is in an exhalation state, the first solenoid valve is controlled to open, and the gas in the air cavity of the transformer oil tank is discharged through the outlet pipe. When the gas is in an inhalation state, the second solenoid valve is controlled to open, and the transformer oil tank absorbs the gas after the desiccant device performs a desiccant operation and / or the dry gas supplemented by the drying air device through the inlet pipe.

8. A digital maintenance-free moisture absorption system for transformers, characterized in that: include: The digital maintenance-free desiccant for transformers according to any one of claims 1 to 6, and a transformer oil tank connected to the digital maintenance-free desiccant for transformers; The control device of the transformer digital maintenance-free desiccant controls the desiccant device to perform moisture recovery operation on the gas, and / or the drying air device replenishes dry gas to the transformer oil tank, so as to keep the gas in the air cavity of the transformer oil tank dry.

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