Transformer maintenance-free desiccant, control method and desiccant system

Abstract

The present application provides a maintenance-free desiccant for transformers, a control method and a desiccant system. According to the real-time monitored gas pressure value and gas humidity value in the air cavity of the transformer oil tank, the desiccant body, the first air outlet pipeline and the first air inlet pipeline of the transformer maintenance-free desiccant are controlled by a set control device to perform gas desiccant recovery operation and / or dry gas replenishment operation. The present application adopts a double-tube maintenance-free desiccant structure to separate the air inlet pipeline from the air outlet pipeline, and when the exhaust gas is dry, the dry gas can be directly recovered to ensure that dry gas can still be replenished for the transformer oil tank in rainy or humid conditions. At the same time, the present application adopts particle drying technology, so that the silica gel particles used for gas desiccant are always in a dry state, thereby effectively reducing the number of times the silica gel particles are replaced, realizing the maintenance-free function of the desiccant, and thus reducing the maintenance cost of the desiccant.

Description

Technical Field

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

[0002] With the development of the power industry in China, the use of power transformers is also increasing. Oil-immersed transformers are a common type of power transformers, widely used in various power systems and industrial fields. Their main feature is that the transformer windings and insulation materials are immersed in insulating oil to improve the insulation performance and heat dissipation efficiency of the transformer, which can ensure the stability and safety of power supply and provide guarantee for the stable operation of enterprises and infrastructure.

[0003] Transformer desiccant is an indispensable component of oil-immersed transformer. It absorbs or condenses moisture and water inside the transformer, reduces the relative humidity inside the transformer, and keeps the transformer oil dry. It also helps prevent various problems caused by excessive humidity in the transformer, such as corrosion and short circuit of electrical equipment, thereby extending the service life of the transformer and ensuring its reliable operation.

[0004] Most transformer desiccant in the market use silica gel particles as desiccant materials. However, the silica gel particles need to be replaced frequently, and the basis for judgment is to monitor whether the silica gel particles change color. That is, when the silica gel particles have changed color, it is considered that the silica gel particles inside the desiccant need to be replaced immediately. When replacing the silica gel particles, it is necessary to first remove the glass shell of the desiccant, pour out the discolored silica gel particles, and pour new silica gel particles in. The entire replacement process is very troublesome and requires power outage maintenance, which greatly increases the maintenance cost and labor cost of the transformer desiccant. Furthermore, on rainy days or in humid conditions, the maintenance frequency of the transformer desiccant will be more frequent and the maintenance cost will be higher. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present application is to provide a transformer maintenance-free desiccant, a control method and a desiccant system, which are used to solve the problem of high maintenance cost of the transformer desiccant due to the replacement of silica gel particles in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the first aspect of the present application provides a maintenance-free desiccant for a transformer, comprising: a control device, a desiccant body, a first air outlet pipeline and a first air inlet pipeline; wherein the desiccant body can be connected to the transformer oil tank through the first air outlet pipeline and the first air inlet pipeline; the control device is communicatively connected with the desiccant body, the first air outlet pipeline and the first air inlet pipeline; the control device is used to control the desiccant body, the first air outlet pipeline and the first air inlet pipeline to perform a gas moisture absorption recovery operation and / or a dry gas replenishment operation based on the gas pressure value and the gas humidity value in the air cavity of the transformer oil tank monitored in real time, so as to keep the gas in the air cavity of the transformer oil tank dry.

[0007] In some embodiments of the first aspect of the present application, based on the real-time monitored gas pressure value and gas humidity value in the air cavity of the transformer oil tank, the method of controlling the desiccant body, the first air outlet pipeline and the first air inlet pipeline to perform a gas moisture recovery operation and / or a dry gas replenishment operation includes: judging whether a gas moisture absorption condition or a gas replenishment condition is met according to the real-time monitored gas pressure value and gas humidity value in the air cavity of the transformer oil tank; if the gas moisture absorption condition is met, controlling the first air outlet pipeline to open, and controlling the desiccant body to perform a gas moisture recovery operation on the gas flowing into the desiccant body from the air cavity of the transformer oil tank through the first air outlet pipeline; if the gas replenishment condition is met, controlling the first air inlet pipeline to open, and controlling the desiccant body to perform a dry gas replenishment operation to replenish dry gas to the transformer oil tank through the first air inlet pipeline.

[0008] In some embodiments of the first aspect of the present application, the desiccant body includes: a drainage air inlet device, a drainage air outlet device, a first desiccant cavity, a second desiccant cavity and a third desiccant cavity; wherein, the first desiccant cavity is connected to the first air outlet pipe, and is connected to the drainage air outlet device through the second air outlet pipe; the second desiccant cavity is connected to the first desiccant cavity, the third desiccant cavity and the drainage air inlet device through the return air pipe, the second air inlet pipe and the third air inlet pipe respectively; the third desiccant cavity is connected to the drainage air inlet device through the fourth air inlet pipe, and is connected to the first air inlet pipe.

[0009] In some embodiments of the first aspect of the present application, the method of performing a gas desiccant recovery operation includes: performing a gas desiccant operation on the gas flowing from the air cavity of the transformer oil tank through the first air outlet pipe into the first desiccant cavity; real-time monitoring of the gas humidity value in the first desiccant cavity and the gas pressure value in the second desiccant cavity, and judging whether the gas recovery conditions are met based on the monitored gas humidity value and the gas pressure value; if the gas recovery conditions are met, opening the return air pipeline to allow the desiccant gas to be filled into the second desiccant cavity for storage, and performing the gas desiccant operation again until the second desiccant cavity is full; if the gas recovery conditions are not met, opening the second air outlet pipe, and discharging the desiccant gas out of the transformer maintenance-free desiccant through the second air outlet pipe.

[0010] In some embodiments of the first aspect of the present application, the method of performing a gas moisture absorption and recovery operation also includes: starting the drainage and air intake device, and opening the third air intake pipeline to suck in external gas and transport it to the second moisture absorption cavity for storage, and performing a gas moisture absorption operation until the second moisture absorption cavity is full.

[0011] In some embodiments of the first aspect of the present application, the method for performing the dry gas replenishment operation includes: opening the second air intake pipeline, and performing a gas moisture absorption operation on the gas flowing from the second moisture absorption cavity into the third moisture absorption cavity; monitoring the gas humidity value in the third moisture absorption cavity in real time, and judging whether the dry gas condition is met according to the monitored gas humidity value; if the dry gas condition is met, replenishing the transformer oil tank with the moisture-absorbed gas through the first air intake pipeline; if the dry gas condition is not met, continuing to perform the gas moisture absorption operation until the gas humidity value meets the dry gas condition.

[0012] In some embodiments of the first aspect of the present application, the method for performing a dry gas replenishment operation also includes: starting the drainage air intake device and opening the fourth air intake pipeline to suck in external gas and transport it to the third moisture absorption cavity to perform a gas moisture absorption operation; real-time monitoring of the gas humidity value in the third moisture absorption cavity, and judging whether the dry gas condition is met based on the monitored gas humidity value; if the dry gas condition is met, replenishing the transformer oil tank with the absorbed gas through the first air intake pipeline; if the dry gas condition is not met, continuing to perform the gas moisture absorption operation until the gas humidity value meets the dry gas condition.

[0013] In some embodiments of the first aspect of the present application, the interiors of the first moisture absorption cavity, the second moisture absorption cavity and the third moisture absorption cavity are all filled with silica gel particles, and dehumidification heating plates are arranged on the outside; wherein, the first moisture absorption cavity, the second moisture absorption cavity and the third moisture absorption cavity absorb moisture from the incoming gas through the silica gel particles, and discharge the water vapor and condensation generated by the moisture absorption from the transformer maintenance-free desiccant through the second air outlet pipe, the third air inlet pipe or the fourth air inlet pipe respectively, and heat and dry the silica gel particles through the dehumidification heating plate to keep the silica gel particles dry.

[0014] To achieve the above-mentioned purpose and other related purposes, the second aspect of the present application provides a control method for a maintenance-free desiccant for a transformer, which is applied to the maintenance-free desiccant for a transformer, comprising: a desiccant body, a first air outlet pipeline and a first air inlet pipeline, wherein the desiccant body can be connected to the transformer oil tank through the first air outlet pipeline and the first air inlet pipeline, and the control method for the maintenance-free desiccant for the transformer comprises: obtaining a gas pressure value and a gas humidity value in the air cavity of the transformer oil tank monitored in real time; based on the gas pressure value and the gas humidity value, controlling the desiccant body, the first air outlet pipeline and the first air inlet pipeline to perform a gas moisture recovery operation and / or a dry gas replenishment operation to keep the gas in the air cavity of the transformer oil tank dry.

[0015] To achieve the above-mentioned purpose and other related purposes, the third aspect of the present application provides a transformer maintenance-free desiccant system, which comprises: a transformer maintenance-free desiccant as described in any one of the above-mentioned embodiments, and a transformer oil tank connected to the transformer maintenance-free desiccant; wherein, the transformer maintenance-free desiccant is used to perform gas desiccant recovery and / or dry gas replenishment on the transformer oil tank to keep the gas in the air cavity of the transformer oil tank dry.

[0016] As described above, the present application provides a transformer maintenance-free desiccant, a control method and a desiccant system. According to the gas pressure value and the gas humidity value in the air cavity of the transformer oil tank monitored in real time, the desiccant body, the first air outlet pipeline and the first air inlet pipeline of the transformer maintenance-free desiccant are controlled by a set control device to perform gas desiccant recovery operation and / or dry gas replenishment operation. The present application adopts a double-tube maintenance-free desiccant structure to separate the air inlet pipeline from the air outlet pipeline, and when the exhaust gas is dry, the dry gas can be directly recovered to ensure that dry gas can still be replenished for the transformer oil tank in rainy or humid conditions. At the same time, the present application adopts particle drying technology, so that the silica gel particles used for gas desiccant are always in a dry state, thereby effectively reducing the number of times the silica gel particles are replaced, realizing the maintenance-free function of the desiccant, and thus reducing the maintenance cost of the desiccant. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic structural diagram of a transformer maintenance-free dehumidifying breather in one embodiment of the present application.

[0018] Figure 2 Shown is a schematic diagram of the working flow of the control device in one embodiment of the present application.

[0019] Figure 3 Shown is a schematic diagram of a process for performing a gas moisture absorption and recovery operation in one embodiment of the present application.

[0020] Figure 4 Shown is a schematic flow chart of performing a dry gas replenishment operation in one embodiment of the present application.

[0021] Figure 5 It is a schematic diagram of a flow chart for performing a dry gas replenishment operation in another embodiment of the present application.

[0022] Figure 6 Shown is a flow chart of a control method for a transformer maintenance-free dehumidifying breather in one embodiment of the present application.

[0023] Figure 7 Shown is a schematic structural diagram of a transformer maintenance-free dehumidification system in one embodiment of the present application. DETAILED DESCRIPTION

[0024] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways 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 without conflict.

[0025] It should be noted that in the following description, with reference to the accompanying drawings, several embodiments of the present application are described in the accompanying drawings. It should be understood that other embodiments may also be used, and mechanical composition, structure, 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 here 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 an element or feature shown in the figure and another element or feature.

[0026] In this application, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "hold" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] Furthermore, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless there is an indication to the contrary in the context. 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. Therefore, "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 will only occur when the combination of elements, functions or operations is inherently mutually exclusive in some way.

[0028] In order to solve the problems in the above-mentioned background technology, the present invention provides a transformer maintenance-free desiccant, a control method and a desiccant system, aiming to solve the problem of high maintenance cost of the transformer desiccant due to the replacement of silica gel particles in the prior art. At the same time, in order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention is further described in detail through the following embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the invention.

[0029] like Figure 1 , which shows a schematic diagram of the structure of a transformer maintenance-free dehumidifier in an embodiment of the present invention. In this embodiment, the transformer maintenance-free dehumidifier 1 comprises: a control device 11, a dehumidifier body 12, a first air outlet pipeline 13 and a first air inlet pipeline 14.

[0030] Among them, Figure 1 As shown, the desiccant body 12 can be connected to the transformer oil tank 2 through the first air outlet pipeline 13 and the first air inlet pipeline 14; the control device 11 is communicatively connected to the desiccant body 12, the first air outlet pipeline 13 and the first air inlet pipeline 14.

[0031] The purpose of the present invention in this embodiment is to adopt a double-tube maintenance-free desiccant structure of a first air outlet pipeline and a first air inlet pipeline, so as to separate the air inlet pipeline from the air outlet pipeline, thereby ensuring that the gas in the air cavity of the connected transformer oil tank remains dry and does not cause gas confusion. The transformer maintenance-free desiccant 1 of the present invention fundamentally solves the problem that a conventional transformer desiccant has only one pipeline and cannot confirm whether the gas in the air cavity of the connected transformer oil tank is dry.

[0032] In a specific embodiment, if Figure 1 As shown, the desiccant body 12 includes: a drainage air inlet device 121, a drainage air outlet device 122, a first moisture absorption cavity 123, a second moisture absorption cavity 124 and a third moisture absorption cavity 125. The first moisture absorption cavity 123 is connected to the first air outlet pipeline 13, and is connected to the drainage air outlet device 122 through the second air outlet pipeline 126; the second moisture absorption cavity 124 is connected to the first moisture absorption cavity 123, the third moisture absorption cavity 125 and the drainage air inlet device 121 through the return air pipeline 127, the second air inlet pipeline 128 and the third air inlet pipeline 129 respectively; the third moisture absorption cavity 125 is connected to the drainage air inlet device 121 through the fourth air inlet pipeline 1210, and is connected to the first air inlet pipeline 14.

[0033] Furthermore, the control device 11 is used to control the desiccant body 12, the first air outlet pipeline 13 and the first air inlet pipeline 14 to perform a gas moisture recovery operation and / or a dry gas replenishment operation based on the real-time monitored gas pressure value and gas humidity value in the air cavity of the transformer oil tank 2, so as to keep the gas in the air cavity of the transformer oil tank 2 dry.

[0034] The transformer maintenance-free desiccant 1 of the present invention adopts digital signal transmission technology through the control device 11, and can obtain the gas pressure value and gas humidity value in the air cavity of the transformer oil tank 2, and judge the health status of the transformer maintenance-free desiccant 1 and the transformer oil tank 2 according to the gas pressure value and gas humidity value, and control the desiccant body 12, the first air outlet pipeline 13 and the first air inlet pipeline 14 to perform different operations, such as discharging moisture in the transformer oil tank 2 and replenishing dry gas. The transformer maintenance-free desiccant 1 product has stable operation, low failure rate, no manual maintenance, can be used for a long time, and effectively reduces labor costs and material costs.

[0035] Further, in one embodiment, if Figure 2 As shown, the specific working mode of the control device 11 includes:

[0036] Step S1: judging whether the gas moisture absorption condition or the gas replenishment condition is met according to the gas pressure value and the gas humidity value in the gas cavity of the transformer oil tank 2 monitored in real time.

[0037] In a specific embodiment, the gas moisture absorption condition includes: the gas pressure value is higher than a preset maximum pressure threshold, or the gas humidity value is higher than a preset humidity threshold. The gas replenishment condition includes: the gas pressure value is lower than a preset minimum pressure threshold.

[0038] For example, on the one hand, when the temperature of the transformer oil in the transformer oil tank 2 connected to the transformer maintenance-free desiccant 1 pipeline through the first air outlet pipeline 13 and the first air inlet pipeline 14 increases, the transformer oil expands. At this time, the gas pressure value in the air cavity of the transformer oil tank 2 increases. If the gas pressure value is higher than the preset maximum pressure threshold, it meets the gas moisture absorption condition, and the excess gas needs to be absorbed and discharged or stored. On the other hand, when the temperature of the transformer oil in the transformer oil tank 2 decreases, the transformer oil level drops, and the gas pressure value in the air cavity decreases. If the gas pressure value is lower than the preset minimum pressure threshold, it meets the gas replenishment condition, and dry gas needs to be replenished. In addition, when the humidity of the gas in the air cavity of the transformer oil tank 2 is high, it should also be dehumidified and dried to meet the gas moisture absorption condition.

[0039] Step S2: If the gas moisture absorption condition is met, the first gas outlet pipeline 13 is controlled to open, and the desiccant body 12 is controlled to perform a gas moisture absorption and recovery operation on the gas flowing into the desiccant body 12 from the air cavity of the transformer oil tank 2 through the first gas outlet pipeline 13.

[0040] In a specific embodiment, the first gas outlet pipeline 13 may be provided with a gas outlet control valve. The control device 11 may control the on / off of the first gas outlet pipeline 13 by controlling the on / off of the provided gas outlet control valve. The first gas outlet pipeline 13 is controlled to be opened, that is, the provided gas outlet control valve is controlled to be opened, so that the first gas outlet pipeline 13 is unobstructed, so that the gas in the gas cavity of the transformer oil tank 2 can flow into the first moisture absorption cavity 123 of the moisture absorber body 12 through the first gas outlet pipeline 13 based on air pressure.

[0041] In one embodiment, if Figure 3 As shown, the methods for performing the gas moisture absorption and recovery operation include:

[0042] Step S21: performing a gas moisture absorption operation on the gas flowing from the gas cavity of the transformer oil tank 2 into the first moisture absorption cavity 123 through the first gas outlet pipeline 13 .

[0043] In a specific embodiment, the first moisture absorption cavity 123 is filled with silica gel particles, and a dehumidification heating plate is arranged outside. At this time, the first moisture absorption cavity performs the gas moisture absorption operation in the following manners: the silica gel particles are used to absorb moisture from the incoming gas, and the water vapor and condensation generated by the moisture absorption are discharged from the transformer maintenance-free dehumidifier 1 through the second gas outlet pipe 126; and the silica gel particles are heated and dried by the dehumidification heating plate to keep the silica gel particles dry.

[0044] The purpose of the design of the present invention in this embodiment is: after the silica gel particles absorb moisture from the gas, the particle drying technology is adopted, so that when the silica gel particles change color or the humidity of the monitored gas increases, the dehumidification heating plate can be automatically started, and the silica gel particles can be dried and dehumidified by the dehumidification heating plate, thereby ensuring that the silica gel particles and the internal gas are always in a dry state, thereby reducing the number of times the silica gel particles are replaced and realizing a maintenance-free humidifier.

[0045] Preferably, the second air outlet pipe 126 can be made of metal material or other non-frost material, which can condense water vapor. In other embodiments, the second air outlet pipe 126 can also be made of other materials, which can be selected according to needs, and the present invention does not limit it.

[0046] Step S22: monitor the gas humidity value in the first moisture absorption cavity 123 and the gas pressure value in the second moisture absorption cavity 124 in real time, and determine whether the gas recovery condition is met according to the monitored gas humidity value and the gas pressure value.

[0047] In a specific embodiment, a temperature and humidity sensor is disposed inside the first moisture absorption cavity 123, which can be used to monitor the gas humidity value in the first moisture absorption cavity 123 in real time. In addition, a pressure sensor is disposed inside the second moisture absorption cavity 124, which can monitor the gas pressure value in the second moisture absorption cavity 124 in real time.

[0048] In this embodiment, the gas recovery condition is used to determine whether the gas after the first moisture absorption cavity 123 absorbs moisture can be recovered. The gas recovery condition includes that the humidity value of the gas in the first moisture absorption cavity 123 is lower than the preset humidity threshold, and the gas pressure value in the second moisture absorption cavity 124 is lower than the preset pressure threshold. That is, when the humidity value of the gas entering the first moisture absorption cavity 123 has reached the expected value after moisture absorption, and it is dry air, and the second moisture absorption cavity 124 is not yet full, at this time, the generated dry gas can be recovered and stored in the second moisture absorption cavity 124.

[0049] Step S23: If the gas recovery conditions are met, the gas return line 127 is opened to allow the dehumidified gas to be filled into the second dehumidification cavity 124 for storage, and the gas dehumidification operation is performed again until the second dehumidification cavity 124 is full.

[0050] When the gas entering the first moisture absorption cavity 123 absorbs moisture, if the humidity value of the gas has reached the expected value, it is judged as dry air, and the second moisture absorption cavity 124 is not yet full. At this time, the generated dry gas is recovered and stored in the second moisture absorption cavity 124, and the generated dry gas continues to absorb moisture so that it can always remain dry.

[0051] The present invention designs a gas recovery structure. When the gas is humidified by the first moisture absorption cavity 123 and the expected dry gas is discharged, it can be directly recovered, so that the dry gas can be replenished in time when the transformer oil tank 2 inhales air; and it can also ensure that dry gas can still be absorbed in rainy days or humid conditions, avoiding frequent operation of the transformer maintenance-free desiccant 1, so that the transformer maintenance-free desiccant 1 can be maintenance-free under any circumstances, reducing maintenance costs.

[0052] In a specific embodiment, a return air control valve may be provided on the return air pipeline 127. The control device 11 may control the on / off of the return air pipeline 127 by controlling the switch of the return air control valve.

[0053] Preferably, the return air pipeline 127 can be made of metal material or other frost-free materials, which can be selected according to specific needs and are not limited in the present invention.

[0054] Step S24: If the gas recovery condition is not met, the second gas outlet pipeline 126 is opened to discharge the dehumidified gas out of the transformer maintenance-free desiccant 1 via the second gas outlet pipeline 126 .

[0055] When the gas entering the first moisture absorption cavity 123 has absorbed moisture, the gas humidity value cannot reach the expected value and still contains a large amount of water; or the second moisture absorption cavity 124 is already full of dry gas. At this time, the gas is no longer recovered and can be directly discharged from the transformer maintenance-free desiccant 1. In addition, it should be noted that the water vapor and condensation generated by the first moisture absorption cavity 123 after absorbing moisture from the gas can also be discharged through the second outlet pipe 126 and the drainage outlet device 122.

[0056] In a specific embodiment, a gas outlet control valve may be provided on the second gas outlet pipeline 126. The control device 11 may control the on / off of the second gas outlet pipeline 126 by controlling the on / off of the provided gas outlet control valve.

[0057] In another embodiment, the method in which the desiccant body 12 performs the gas desiccant recovery operation also includes: starting the drainage and air intake device 121, and opening the third air intake pipe 129 to absorb the external gas and transport it to the second desiccant cavity 124 for storage, performing the gas desiccant operation until the second desiccant cavity 124 is full.

[0058] Specifically, the second moisture absorption cavity 124 is filled with silica gel particles, and a dehumidification heating plate is arranged outside. The second moisture absorption cavity 124 absorbs moisture from the incoming gas through the silica gel particles, and the water vapor and condensation generated by the moisture absorption are discharged from the transformer maintenance-free dehumidifier 1 through the third air inlet pipeline 129; and the silica gel particles are heated and dried by the dehumidification heating plate to keep the silica gel particles dry at all times, thereby reducing the maintenance times of the transformer maintenance-free dehumidifier 1 and reducing its maintenance cost.

[0059] Preferably, the third air inlet pipe 129 can be made of metal material or other non-frost material, which can condense water vapor. In other embodiments, the third air inlet pipe 129 can also be made of other materials, which can be selected according to needs, and the present invention does not limit it.

[0060] Step S3: If the gas replenishment condition is met, the first air inlet pipeline 14 is controlled to be opened, and the desiccant body 12 is controlled to perform a dry gas replenishment operation, so as to replenish dry gas to the transformer oil tank 2 through the first air inlet pipeline 14 .

[0061] In one embodiment, if Figure 4 As shown, the methods for performing the dry gas replenishment operation include:

[0062] Step S31 : opening the second air inlet pipeline 128 to perform a gas moisture absorption operation on the gas flowing from the second moisture absorption cavity 124 into the third moisture absorption cavity 125 .

[0063] The purpose of the design of the present invention in this embodiment is that in rainy days or humid conditions, the external air will also be relatively humid and cannot meet the dry gas conditions. At this time, by flowing the dry gas pre-stored in the second moisture absorption cavity 124 into the third moisture absorption cavity 125 and then filling it into the transformer oil tank 2, it is possible to effectively avoid the transformer maintenance-free desiccant 1 from frequently absorbing moisture from the external humid gas, thereby making the transformer maintenance-free desiccant 1 maintenance-free under any circumstances and reducing maintenance costs.

[0064] In a specific embodiment, the second air inlet pipeline 128 may be provided with an air inlet control valve. The control device 11 may control the on-off of the first air outlet pipeline 13 by controlling the opening and closing of the provided air outlet control valve. In addition, the second air inlet pipeline 128 may be provided with an air suction pump for sucking the dry gas stored in the second moisture absorption cavity 124 into the third moisture absorption cavity 125.

[0065] Furthermore, in one embodiment, the third moisture absorption cavity 125 is filled with silica gel particles inside and a dehumidification heating plate is arranged outside. The third moisture absorption cavity 125 performs gas moisture absorption operation on the gas flowing into the third moisture absorption cavity 125 from the second moisture absorption cavity 124 in the manner that specifically includes: absorbing moisture from the gas entering the third moisture absorption cavity 125 through the silica gel particles, and discharging the water vapor and condensation generated by the moisture absorption from the transformer maintenance-free dehumidifier 1 through the fourth air inlet pipeline 1210; and heating and drying the silica gel particles through the dehumidification heating plate to keep the silica gel particles dry.

[0066] Preferably, the second air intake pipeline 128 and the fourth air intake pipeline 1210 may be made of metal material or other frost-free material. However, in other embodiments, the second air intake pipeline 128 and the fourth air intake pipeline 1210 may also be made of other materials, which can be selected according to needs and are not limited by the present invention.

[0067] Step S32: monitor the gas humidity value in the third moisture absorption cavity 125 in real time, and determine whether the dry gas condition is met according to the monitored gas humidity value.

[0068] In a specific embodiment, a temperature and humidity sensor is provided inside the third moisture absorption cavity 125, which can be used to monitor in real time the humidity value of the gas in the third moisture absorption cavity 125. When the humidity value of the gas is lower than a preset humidity threshold, it is determined that the gas flowing out of the third moisture absorption cavity 125 is dry gas and can be added to the transformer oil tank 2; when the humidity value of the gas does not meet expectations, it cannot be added to the transformer oil tank 2 as dry gas.

[0069] Step S33: If the dry gas condition is met, the dehumidified gas is added to the transformer oil tank 2 through the first air inlet pipeline 14 .

[0070] If the dry gas condition is met, the gas after moisture absorption by the third moisture absorption cavity 125 is determined to be dry gas, and is replenished to the transformer oil tank 2 through the first air inlet pipeline 14 .

[0071] In a specific embodiment, an air intake control valve may be provided on the first air intake pipeline 14. The control device 11 may control the on / off of the first air intake pipeline 14 by controlling the opening and closing of the air intake control valve. The first air intake pipeline 14 is controlled to be opened, that is, the air intake control valve is controlled to be opened, so that the first air intake pipeline 14 is unobstructed, so that the dry gas can flow into the transformer oil tank 2 through the first air intake pipeline 14 based on the air pressure.

[0072] Step S34: If the dry gas condition is not met, continue to perform the gas moisture absorption operation until the gas humidity value meets the dry gas condition.

[0073] In another embodiment, if Figure 5 As shown, the method of performing the dry gas replenishment operation also includes:

[0074] Step S35: Start the drainage air intake device 121 and open the fourth air intake pipeline 1210 to inhale the external air and transport it to the third moisture absorption cavity 125 to perform the gas moisture absorption operation.

[0075] Specifically, the drainage and air intake device 121 is used to absorb external air and discharge water vapor and condensation generated by moisture absorption. The third moisture absorption cavity 125 performs the gas moisture absorption operation in the same manner as the specific embodiment in the above step S32.

[0076] Step S36: monitor the gas humidity value in the third moisture absorption cavity 125 in real time, and determine whether the dry gas condition is met according to the monitored gas humidity value.

[0077] As shown above, in a specific embodiment, a temperature and humidity sensor is provided inside the third moisture absorption cavity 125, which can be used to monitor in real time the humidity value of the gas in the third moisture absorption cavity 125. When the humidity value of the gas is lower than a preset humidity threshold, it is determined that the gas flowing out of the third moisture absorption cavity 125 is dry gas and can be added to the transformer oil tank 2; when the humidity value of the gas does not meet expectations, it cannot be added to the transformer oil tank 2 as dry gas.

[0078] Step S37: If the dry gas condition is met, the dehumidified gas is added to the transformer oil tank 2 through the first air inlet pipeline 14 .

[0079] Step S38: If the dry gas condition is not met, continue to perform the gas moisture absorption operation until the gas humidity value meets the dry gas condition.

[0080] like Figure 6As shown, a flow chart of a control method of a transformer maintenance-free desiccant in an embodiment of the present invention is shown. In this embodiment, the control method of the transformer maintenance-free desiccant is applied to any of the above-mentioned transformer maintenance-free desiccant 1. Figure 1 As shown, the transformer maintenance-free desiccator 1 at least comprises: a desiccator body 12, a first air outlet pipeline 13 and a first air inlet pipeline 14. Furthermore, the desiccator body 12 can be connected to the transformer oil tank 2 through the first air outlet pipeline 13 and the first air inlet pipeline 14.

[0081] Specifically, the control method of the transformer maintenance-free desiccant includes:

[0082] Step S61: Acquire the gas pressure value and gas humidity value in the gas cavity of the transformer oil tank monitored in real time;

[0083] Step S62: Based on the gas pressure value and the gas humidity value, the desiccant body 12, the first air outlet pipeline 13 and the first air inlet pipeline 14 are controlled to perform a gas moisture recovery operation and / or a dry gas replenishment operation to keep the gas in the air cavity of the transformer oil tank 2 dry.

[0084] It should be noted that the control method of the transformer maintenance-free desiccant provided in the above embodiment belongs to the same concept as the transformer maintenance-free desiccant embodiment. The specific implementation process is detailed in the transformer maintenance-free desiccant embodiment and will not be repeated here.

[0085] like Figure 7 As shown, a schematic diagram of the structure of a transformer maintenance-free dehumidification system in an embodiment of the present invention is shown. In this embodiment, the transformer maintenance-free dehumidification system comprises: a transformer maintenance-free dehumidification absorber 1 as described in any one of the above items, and a transformer oil tank 2 connected to the transformer maintenance-free dehumidification absorber 1. The transformer maintenance-free dehumidification absorber 1 performs gas dehumidification recovery and / or dry gas supplement on the transformer oil tank 2, so that the gas in the air cavity of the transformer oil tank 2 remains dry.

[0086] In a specific embodiment, two air holes are provided at the upper end of the transformer oil tank 2, which are used as air inlet and air outlet respectively, and the first air inlet pipeline and the first air outlet pipeline in the transformer maintenance-free desiccant 1 are installed correspondingly to achieve communication with the transformer maintenance-free desiccant 1. In addition, a pressure sensor and a temperature and humidity sensor are installed in the transformer oil tank 2 at the same time, which are used to monitor the gas pressure value and gas humidity value in the air cavity of the transformer oil tank 2 in real time, and send the gas pressure value and gas humidity value to the transformer maintenance-free desiccant 1.

[0087] The purpose of the design of the present invention in this embodiment is that when the transformer oil in the transformer oil tank 2 expands and contracts due to heat, the gas in its air cavity will increase or decrease. The pressure sensor and the temperature and humidity sensor monitor and judge the gas pressure value and the gas humidity value in real time, and according to different gas conditions, the transformer maintenance-free desiccant 1 can absorb moisture and dry the gas in the air cavity; if the gas humidity increases, the transformer maintenance-free desiccant 1 can also circulate the gas and replenish the dry gas into the transformer oil tank 2; and, more importantly, the transformer maintenance-free desiccant 1 can also heat and dry the silica gel particles used for moisture absorption and discharge the generated water vapor and condensation, so that the silica gel particles can always remain dry, and there is no need to frequently replace the silica gel particles, thereby achieving the purpose of maintenance-free, effectively reducing maintenance costs, and can be used for a long time.

[0088] It should be noted that the transformer maintenance-free desiccant system provided in the above embodiment and the transformer maintenance-free desiccant embodiment belong to the same concept, and the specific implementation process is detailed in the transformer maintenance-free desiccant embodiment, which will not be repeated here.

[0089] In summary, the present application provides a transformer maintenance-free desiccant, a control method and a desiccant system. According to the gas pressure value and the gas humidity value in the air cavity of the transformer oil tank monitored in real time, the desiccant body, the first air outlet pipeline and the first air inlet pipeline of the transformer maintenance-free desiccant are controlled by a set control device to perform gas desiccant recovery operation and / or dry gas replenishment operation. The present application adopts a double-tube maintenance-free desiccant structure, which realizes the separation of the air inlet pipeline from the air outlet pipeline, and when the exhaust gas is dry, the dry gas can be directly recovered to ensure that the transformer oil tank can still be replenished with dry gas in rainy days or humid conditions. At the same time, the present application adopts particle drying technology, so that the silica gel particles used for gas desiccant are always in a dry state, thereby effectively reducing the number of times the silica gel particles are replaced, realizing the maintenance-free function of the desiccant, and then reducing the maintenance cost of the desiccant. Therefore, the present application effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0090] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A transformer maintenance-free desiccant, characterized in that: include: A control device, a dehumidifier body, a first air outlet pipeline and a first air inlet pipeline; Wherein, the desiccant body can be connected to the transformer oil tank through the first air outlet pipeline and the first air inlet pipeline; the desiccant body includes: a drainage air inlet device, a drainage air outlet device, a first desiccant cavity, a second desiccant cavity and a third desiccant cavity; wherein, the first desiccant cavity is connected to the first air outlet pipeline, and is connected to the drainage air outlet device through the second air outlet pipeline; the second desiccant cavity is connected to the first desiccant cavity, the third desiccant cavity and the drainage air inlet device through the return air pipeline, the second air inlet pipeline and the third air inlet pipeline respectively, for storing the recovered dry gas; the third desiccant cavity is connected to the drainage air inlet device through the fourth air inlet pipeline, and is connected to the first air inlet pipeline; The control device is in communication connection with the dehumidifier body, the first air outlet pipeline and the first air inlet pipeline; The control device is used to control the desiccant body, the first air outlet pipeline and the first air inlet pipeline to perform a gas moisture recovery operation and / or a dry gas replenishment operation based on the gas pressure value and the gas humidity value in the air cavity of the transformer oil tank monitored in real time, so as to keep the gas in the air cavity of the transformer oil tank dry.

2. The transformer maintenance-free desiccant according to claim 1, characterized in that: Based on the real-time monitored gas pressure value and gas humidity value in the gas cavity of the transformer oil tank, the method of controlling the desiccant body, the first gas outlet pipeline and the first gas inlet pipeline to perform the gas moisture recovery operation and / or the dry gas supplementation operation includes: According to the real-time monitored gas pressure value and gas humidity value in the gas cavity of the transformer oil tank, judging whether the gas moisture absorption condition or the gas replenishment condition is met; If the gas moisture absorption condition is met, the first gas outlet pipeline is controlled to be opened, and the desiccant body is controlled to perform a gas moisture absorption and recovery operation on the gas flowing into the desiccant body from the gas cavity of the transformer oil tank through the first gas outlet pipeline; If the gas replenishment condition is met, the first air inlet pipeline is controlled to open, and the desiccant body is controlled to perform a dry gas replenishment operation, so as to replenish dry gas to the transformer oil tank through the first air inlet pipeline.

3. The transformer maintenance-free desiccant according to claim 2, characterized in that: Ways to perform gas moisture recovery operations include: performing a gas moisture absorption operation on the gas flowing from the gas cavity of the transformer oil tank through the first gas outlet pipeline into the first moisture absorption cavity; Real-time monitoring of the gas humidity value in the first moisture absorption cavity and the gas pressure value in the second moisture absorption cavity, and judging whether the gas recovery condition is met according to the monitored gas humidity value and the gas pressure value; If the gas recovery conditions are met, the gas return pipeline is opened to allow the dehumidified gas to be filled into the second dehumidification cavity for storage, and the gas dehumidification operation is performed again until the second dehumidification cavity is full; If the gas recovery condition is not met, the second gas outlet pipeline is opened, and the dehumidified gas is discharged from the transformer maintenance-free desiccant through the second gas outlet pipeline.

4. The transformer maintenance-free desiccant according to claim 2, characterized in that: The method of performing the gas moisture absorption and recovery operation also includes: The drainage and air intake device is started, and the third air intake pipeline is opened to suck in the external gas and transport it to the second moisture absorption cavity for storage, and perform a gas moisture absorption operation until the second moisture absorption cavity is full.

5. The transformer maintenance-free desiccant according to claim 2, characterized in that: Ways to perform dry gas replenishment operations include: Opening the second air inlet pipeline to perform a gas moisture absorption operation on the gas flowing from the second moisture absorption cavity into the third moisture absorption cavity; Real-time monitoring of the gas humidity value in the third moisture absorption cavity, and judging whether the dry gas condition is met according to the monitored gas humidity value; If the dry gas condition is met, the hygroscopic gas is added to the transformer tank through the first air inlet pipeline; If the dry gas condition is not met, the gas moisture absorption operation is continued until the gas humidity value meets the dry gas condition.

6. The transformer maintenance-free desiccant according to claim 2, characterized in that: Methods of performing dry gas replenishment operations also include: Starting the drainage and air intake device, and opening the fourth air intake pipeline, so as to inhale and transport the external air to the third moisture absorption cavity, and perform a gas moisture absorption operation; Real-time monitoring of the gas humidity value in the third moisture absorption cavity, and judging whether the dry gas condition is met according to the monitored gas humidity value; If the dry gas condition is met, the hygroscopic gas is added to the transformer tank through the first air inlet pipeline; If the dry gas condition is not met, the gas moisture absorption operation is continued until the gas humidity value meets the dry gas condition.

7. The transformer maintenance-free dehumidifying breather according to any one of claims 1 to 6, characterized in that: The first moisture absorption cavity, the second moisture absorption cavity and the third moisture absorption cavity are all filled with silica gel particles, and a dehumidification heating plate is arranged on the outside; Among them, the first moisture absorption cavity, the second moisture absorption cavity and the third moisture absorption cavity absorb moisture from the incoming gas through the silica gel particles, and discharge the water vapor and condensation generated by the moisture absorption from the transformer maintenance-free desiccant through the second air outlet pipeline, the third air inlet pipeline or the fourth air inlet pipeline respectively, and heat and dry the silica gel particles through the dehumidification heating plate to keep the silica gel particles dry.

8. A control method for a transformer maintenance-free desiccant, characterized in that: Maintenance-free dehumidifying breather for transformers, including: A desiccant body, a first air outlet pipeline and a first air inlet pipeline, wherein the desiccant body can be connected to a transformer oil tank through the first air outlet pipeline and the first air inlet pipeline, and the method comprises: Acquire the gas pressure value and gas humidity value in the gas cavity of the transformer oil tank monitored in real time; Based on the gas pressure value and the gas humidity value, controlling the desiccant body, the first gas outlet pipeline and the first gas inlet pipeline to perform a gas moisture recovery operation and / or a dry gas supplement operation, so as to keep the gas in the gas cavity of the transformer oil tank dry; Among them, the desiccant body includes: a drainage air inlet device, a drainage air outlet device, a first desiccant cavity, a second desiccant cavity and a third desiccant cavity; the first desiccant cavity is connected to the first air outlet pipe, and is connected to the drainage air outlet device through the second air outlet pipe; the second desiccant cavity is connected to the first desiccant cavity, the third desiccant cavity and the drainage air inlet device through the return air pipe, the second air inlet pipe and the third air inlet pipe respectively; the third desiccant cavity is connected to the drainage air inlet device through the fourth air inlet pipe, and is connected to the first air inlet pipe.

9. A transformer maintenance-free moisture absorption system, characterized in that: include: The transformer maintenance-free desiccant according to any one of claims 1 to 7, and a transformer oil tank connected to the transformer maintenance-free desiccant; The transformer maintenance-free desiccant is used to recover gas moisture and / or replenish dry gas in the transformer oil tank, so that the gas in the air cavity of the transformer oil tank is kept dry.

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