CN111111315A - Method for vacuum filtering of natural ester insulating oil for transformer - Google Patents
Method for vacuum filtering of natural ester insulating oil for transformer Download PDFInfo
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- CN111111315A CN111111315A CN201911194318.7A CN201911194318A CN111111315A CN 111111315 A CN111111315 A CN 111111315A CN 201911194318 A CN201911194318 A CN 201911194318A CN 111111315 A CN111111315 A CN 111111315A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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Abstract
The invention provides a method for filtering natural ester insulating oil for a transformer in vacuum, which belongs to the technical field of transformer manufacturing processes and comprises the following steps: the method comprises the steps of arranging a first container and a second container which are communicated with each other through an air pipe, arranging an oil filtering mechanism for heating and filtering the natural ester insulating oil, arranging a nitrogen mechanism for filling nitrogen into the air pipe and discharging the nitrogen, keeping the pressure of the nitrogen in the first container and the pressure of the nitrogen in the second container stable, and starting the oil filtering mechanism and the nitrogen mechanism to enable the natural ester insulating oil in the first container or the second container to flow to the oil filtering mechanism so as to enable the temperature of the natural ester insulating oil to meet the oil filtering requirement. The method for filtering the natural ester insulating oil for the transformer in vacuum has the technical effects of high heating temperature of the natural ester insulating oil, difficulty in oxidative decomposition, oxygen isolation and high oil filtering efficiency.
Description
Technical Field
The invention belongs to the technical field of transformer manufacturing processes, and particularly relates to a method for vacuum oil filtering of natural ester insulating oil for a transformer.
Background
Most of transformers are cooled by mineral oil, most of the transformers are hydrocarbon mineral oil which is easy to cause environmental pollution, and lipid vegetable oil which is suitable for being used as transformer cooling liquid is not widely popularized, but is more and more widely applied due to the characteristics of reproducibility, no toxicity, easy decomposition and high burning explosion point. Both hydrocarbon mineral oils and fatty vegetable oils are typically filtered to the required transformer standards before use, and in the event of transformer failure, the internal transformer oil is typically filtered to the required standards.
The traditional oil filtering process of the hydrocarbon mineral oil of the transformer utilizes a vacuum oil filter to heat the transformer oil to 50-60 ℃ for circular filtration. Compared with hydrocarbon mineral oil, the lipid vegetable oil belongs to different chemical substances, has high viscosity and is easier to oxidize and decompose, the heating temperature of the lipid vegetable oil is higher, and the filtering requirement on the lipid vegetable oil cannot be met by adopting a common vacuum oil filter.
Disclosure of Invention
The invention aims to provide a method for vacuum oil filtration of natural ester insulating oil for a transformer, and aims to solve the technical problem that an oil filter cannot meet the filtration requirement of lipid vegetable oil.
In order to achieve the purpose, the invention adopts the technical scheme that: the method for filtering the natural ester insulating oil for the transformer in vacuum comprises the following steps:
arranging two containers for containing natural ester insulating oil, namely a first container and a second container, and communicating the tops of the first container and the second container through an air pipe;
arranging an oil filtering mechanism, wherein the oil filtering mechanism is communicated with the first container and the second container respectively, and is used for heating and filtering the natural ester insulating oil flowing between the first container and the second container;
arranging a nitrogen mechanism to enable the nitrogen mechanism to be communicated with the air pipe, enabling the nitrogen mechanism to charge nitrogen into the air pipe or discharge the nitrogen from the air pipe, and enabling the nitrogen mechanism to keep the pressure of the nitrogen in the first container and the pressure of the nitrogen in the second container stable;
and starting the oil filtering mechanism and the nitrogen mechanism to enable the natural ester insulating oil in the first container to flow to the oil filtering mechanism, and enabling the natural ester insulating oil heated by the oil filtering mechanism to flow to the second container, so that the temperature of the natural ester insulating oil meets the oil filtering requirement.
As another embodiment of the application, a control mechanism is further arranged behind the nitrogen mechanism, and the control mechanism is respectively electrically connected with the oil filtering mechanism and the nitrogen mechanism, so that the control mechanism controls the heating temperature of the oil filtering mechanism and the nitrogen charging and discharging amount of the nitrogen mechanism.
As another embodiment of the present application, after the control mechanism is disposed, a pressure detector is disposed in the first container or the second container, so that the pressure detector detects the pressure value of the nitrogen gas in the first container and the second container, and the pressure detector is electrically connected to the control mechanism.
As another embodiment of the present application, after the pressure detector is disposed, a temperature detector is disposed in the oil filtering mechanism, so that the temperature detector detects the heating temperature of the natural ester insulating oil in the oil filtering mechanism, and the temperature detector is electrically connected to the control mechanism.
As another embodiment of the present application, after the temperature detector is disposed, a heating mechanism is disposed on the oil inlet pipeline of the oil filtering mechanism, so that the heating mechanism and a heater in the oil filtering mechanism operate alternately, the heating mechanism assists in heating the natural ester insulating oil flowing through, and the heating mechanism is electrically connected to the control mechanism.
As another embodiment of the present application, an electric valve is disposed on the end of the oil pipe, and the electric valve is electrically connected to the control mechanism.
As another embodiment of the application, control mechanism includes display, information receiving module, information judgment module, control module and first wireless communication module, information receiving module receives the information that pressure detector, temperature detector surveyed, information judgment module judges whether the information that surveys satisfies the oil strain requirement of natural ester insulating oil, control module control oil strain mechanism, nitrogen gas mechanism and heating mechanism open and close, first wireless communication module realizes carrying out real-time wireless communication with external equipment.
As another embodiment of the present application, the control mechanism further includes a mobile terminal having a second wireless communication module, and the control mechanism and the mobile terminal are wirelessly connected through real-time wireless communication between the first wireless communication module and the second wireless communication module.
As another embodiment of this application, control mechanism still includes alarm module, and makes alarm module with control module electric connection, alarm module can send alarm signal when control mechanism takes place unusually.
As another embodiment of the present application, if the temperature of the natural ester insulating oil does not meet the oil filtering requirement, the oil inlet on the oil filtering mechanism is connected to the oil outlet of the second container, the oil outlet on the oil filtering mechanism is connected to the oil inlet of the first container, so that the natural ester insulating oil in the second container flows into the first container after being heated and filtered by the oil filtering mechanism, and in addition, the heating mechanism is further installed on an oil pipe between the oil filtering mechanism and the second container to heat the natural ester insulating oil flowing out of the second container, so that the heating temperature of the natural ester insulating oil by the oil filtering mechanism or the heating temperature of the natural ester insulating oil by the heating mechanism meets the oil filtering requirement; if the temperature of the natural ester insulating oil does not meet the oil filtering requirement, the natural ester insulating oil is heated back and forth through the oil filtering mechanism, and meanwhile, the nitrogen mechanism maintains the stable nitrogen pressure in the first container and the second container.
The method for filtering the natural ester insulating oil for the transformer in vacuum has the beneficial effects that: compared with the prior art, the method for vacuum oil filtering of the natural ester insulating oil for the transformer can heat, filter, charge and discharge nitrogen for the natural ester insulating oil in the first container and the second container by arranging the oil filtering mechanism and the nitrogen mechanism, the nitrogen pressure in the first container and the second container is balanced, the nitrogen pressure in the air pipe is kept stable, so that the temperature of the natural ester insulating oil reaches the oil filtering requirement, the nitrogen is charged into the first container or the second container, and the oxygen is discharged, so that the oxygen is isolated from the natural ester insulating oil, the technical problems that an oil filter cannot meet the filtering requirement of lipid vegetable oil and the oil filter is easy to oxidize are solved, and the method has the technical effects of controllable heating temperature of the natural ester insulating oil, difficulty in oxidative decomposition, effective isolation of the oxygen and high oil filtering efficiency.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of an arrangement of a method for vacuum filtering natural ester insulating oil for a transformer according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another arrangement of a method for vacuum filtering natural ester insulating oil for a transformer according to an embodiment of the present invention;
fig. 3 is a control block diagram of a method for vacuum filtering natural ester insulating oil for a transformer according to an embodiment of the present invention.
In the figure: 1. a first container; 2. a second container; 3. an oil filtering mechanism; 4. a nitrogen mechanism; 5. a control mechanism; 6. a pressure detector; 7. a temperature detector; 8. a heating mechanism; 9. an oil pipe; 10. a mobile terminal; 11. the trachea.
The dashed lines in fig. 1 and 2 indicate the control signal flow direction.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 and fig. 3 together, a method for vacuum filtering natural ester insulating oil for a transformer according to the present invention will now be described. The method for filtering the natural ester insulating oil for the transformer in vacuum comprises the following steps:
arranging two containers for containing natural ester insulating oil, namely a first container 1 and a second container 2 respectively, and communicating the tops of the first container 1 and the second container 2 through an air pipe 11;
arranging an oil filtering mechanism 3, enabling the oil filtering mechanism 3 to be respectively communicated with the first container 1 and the second container 2, and enabling the oil filtering mechanism 3 to heat and filter the natural ester insulating oil flowing between the first container 1 and the second container 2;
arranging a nitrogen mechanism 4, communicating the nitrogen mechanism 4 with the air pipe 11, filling nitrogen into the air pipe 11 or discharging nitrogen from the air pipe 11 by the nitrogen mechanism 4, and keeping the pressure of the nitrogen in the first container 1 and the second container 2 stable;
and starting the oil filtering mechanism 3 and the nitrogen mechanism 4 to enable the natural ester insulating oil in the first container 1 to flow to the oil filtering mechanism 3, enabling the natural ester insulating oil heated by the oil filtering mechanism 3 to flow to the second container 2, enabling the temperature of the natural ester insulating oil to meet the oil filtering requirement, and enabling nitrogen generated by the nitrogen mechanism 4 to be filled into the air pipe 11 or be exhausted out of the air pipe 11 through the nitrogen mechanism 4.
Compared with the prior art, the method for vacuum filtering of the natural ester insulating oil for the transformer can heat, filter and charge and discharge nitrogen for the natural ester insulating oil in the first container 1 and the second container 2 by arranging the oil filtering mechanism 3 and the nitrogen mechanism 4, the nitrogen pressure in the first container 1 and the second container 2 is balanced, the nitrogen pressure in the air pipe 11 is kept stable, so that the temperature of the natural ester insulating oil reaches the oil filtering requirement, the nitrogen is charged into the first container 1 or the second container 2 and the oxygen is discharged, so that the oxygen is isolated from the natural ester insulating oil, the technical problems that an oil filtering machine cannot meet the filtering requirement of lipid vegetable oil and the oil is easy to oxidize are solved, the method has the advantages of controllable heating temperature of the natural ester insulating oil, difficult oxidative decomposition and effective isolation of the oxygen, the technical effect that the oil filtering efficiency is high.
The oil content of the natural ester insulating oil in the first container 1 and the second container 2 is a part of the container capacity, preferably a half; if the amount of natural ester insulating oil in the first and second vessels 1, 2 is close to the capacity of the vessels, the oil filtration method does not work.
In a specific embodiment, the first container 1 and the second container 2 are both closed containers, the first container 1 is communicated with the second container 2 through the air pipe 11, so that the air pressures in the first container 1 and the second container 2 are communicated with each other, the air pressure can be kept stable, the oil filtering mechanism 3 is a vacuum oil filter, the vacuum oil filter is in the prior art, natural ester insulating oil can be filtered, heated and the like, a heater and an oil filtering device are arranged in the vacuum oil filter, specific functions and principles of the vacuum oil filter are not described herein, the heating temperature of the natural ester insulating oil by a general vacuum oil filter cannot be controlled, and the vacuum oil filtering device can control the temperature of the natural ester insulating oil by collecting the heating temperature of the oil filtering mechanism 3, so that the oil filtering operation is facilitated. The heater belongs to a part in the oil filtering mechanism 3, belongs to the prior art, and the function of the heater is to heat the natural ester insulating oil, and the principle of the heater is not described in detail herein.
The nitrogen mechanism 4 belongs to the prior art, can fill nitrogen and discharge nitrogen to the trachea 11, still can make the nitrogen pressure value in the container keep stable. Specifically, the pressure values of the nitrogen in the first container 1 and the second container 2 are both 10kPa-30kPa, and the pressure values of the nitrogen in the air pipe 11 are both 10kPa-30 kPa. The nitrogen mechanism 4 fills nitrogen into the first container 1 and the second container 2 through the air pipe 11, and can discharge the nitrogen at the same time, so that the natural ester insulating oil is isolated from oxygen and is not easy to oxidize. The oil filtration operation was carried out without oxidation.
Because the natural ester insulating oil belongs to different chemical substances compared with hydrocarbon mineral oil, has higher viscosity and is easy to oxidize and decompose, the contact with oxygen is generally reduced as much as possible during storage, the problem of easy oxidization and decomposition of the natural ester insulating oil is solved by the arranged nitrogen device, and the natural ester insulating oil can be filtered when being heated to about 80 ℃ by controlling the heating temperature of the oil filtering mechanism 3.
Referring to fig. 1 to 3, after the nitrogen mechanism 4 is provided, a control mechanism 5 is further provided, and the control mechanism 5 is electrically connected to the oil filtering mechanism 3 and the nitrogen mechanism 4, respectively, so that the control mechanism 5 controls the heating temperature of the oil filtering mechanism 3 and the nitrogen charging and discharging amount of the nitrogen mechanism 4. The heating temperature of the natural ester insulating oil in the oil filtering mechanism 3 can be controlled by the arranged control mechanism 5, the oil filtering temperature of common hydrocarbon mineral oil is 50-60 ℃, but the natural ester insulating oil is heated to 80 ℃ to meet the oil filtering requirement, the control mechanism 5 controls the heating temperature to improve the heating temperature of a heater in the oil filtering mechanism 3, and further the temperature of the natural ester insulating oil can meet the oil filtering requirement.
The control mechanism 5 is respectively connected with the oil filtering mechanism 3 and the nitrogen mechanism 4, and can control the heating temperature of the oil filtering mechanism 3 and the nitrogen filling amount or the nitrogen discharge amount of the nitrogen mechanism 4 to the air pipe 11, thereby achieving the effects of isolating oxygen and preventing oxidation. Generally, the pressure value of the nitrogen gas in the first container 1 and the second container 2 is 10kPa-30kPa, the nitrogen gas in the first container 1 and the second container 2 is communicated through a gas pipe 11, and the oxygen gas in the first container 1 and the second container 2 can be discharged by filling the nitrogen gas through a nitrogen gas mechanism 4.
Referring to fig. 1 to 3, after the control mechanism 5 is disposed, the pressure detectors 6 are disposed in the first container 1 and the second container 2, so that the pressure detectors 6 detect the pressure value of nitrogen in the first container 1 or the second container 2, and the pressure detectors 6 are electrically connected to the control mechanism 5. The signal of the nitrogen pressure value detected by the pressure detector 6 is transmitted to the control mechanism 5, and the current nitrogen pressure value can be seen on the control mechanism 5.
Referring to fig. 1 to 3, after the pressure detector 6 is disposed, the temperature detector 7 is disposed in the oil filtering mechanism 3, so that the temperature detector 7 detects the heating temperature of the natural ester insulating oil in the oil filtering mechanism 3, and the temperature detector 7 is electrically connected to the control mechanism 5. The heating temperature signal of the oil filtering mechanism 3 detected by the temperature detector 7 is transmitted to the control mechanism 5, the current heating temperature value can be seen on the control mechanism 5, and if the current heating temperature does not meet the oil filtering requirement, the heater in the oil filtering mechanism 3 is continuously heated until the oil filtering requirement is met; if the detected heating temperature exceeds the temperature of the filtered oil, the control mechanism 5 controls the oil filtering mechanism 3 to stop heating, and the temperature detector 7 is arranged, so that the current temperature of the natural ester insulating oil can be detected in real time, and oil filtering operation can be carried out within a proper range.
In one embodiment, the natural ester insulating oil is heated to a temperature of about 80 ℃.
Referring to fig. 1 to 3, after the temperature detector 7 is disposed, the heating mechanism 8 is disposed on the oil inlet pipe of the oil filtering mechanism 3, so that the heating mechanism 8 assists in heating the flowing natural ester insulating oil, the heating mechanism 8 and the heater in the oil filtering mechanism 3 operate alternately, and the heating mechanism 8 is electrically connected to the control mechanism 5. The heating mechanism 8 is arranged on the front end oil pipe 9 of the oil filtering mechanism 3 to heat the natural ester insulating oil, so that the temperature of the heated natural ester insulating oil can meet the oil filtering requirement. The heating mechanism 8 can be used alternately with a heater built in the oil filtering mechanism 3, when the oil filtering mechanism 3 filters the natural ester insulating oil, the heating mechanism 8 can be selected to heat the natural ester insulating oil which does not enter the oil filtering mechanism 3, so that the temperature of the natural ester insulating oil which flows into the oil filtering mechanism 3 again reaches 80 ℃, and the heater and the heating mechanism 8 of the oil filtering mechanism 3 are used alternately, so that the heater can be omitted in the oil filtering mechanism 3, and the oil filtering operation can be directly carried out.
In a normal situation, the heating mechanism 8 is installed on the oil pipe 9 between the oil filtering mechanism 3 and the first container, when the natural ester insulating oil is heated, the heating mechanism 8 heats the natural ester insulating oil in the first container 1, then the natural ester insulating oil flows into the oil filtering mechanism 3, and finally the natural ester insulating oil passes through the oil filtering mechanism 3 and is heated to a temperature meeting the requirement of oil filtering. Under special conditions, when the heating temperature of the oil filtering mechanism 3 does not meet the oil filtering requirement, the connection ends of the first container 1, the second container 2 and the oil filtering mechanism 3 can be reversely connected, so that the natural ester insulating oil flows reversely, the heating mechanism 8 is arranged on the oil pipe 9 at the front end of the oil filtering mechanism 3, the natural ester insulating oil in the second container 2 firstly passes through the heating mechanism 8, then flows into the oil filtering mechanism 3, finally reaches the first container, and finally meets the oil filtering requirement.
Specifically, the oil filtering mechanism 3 can heat the natural ester insulating oil, wherein the heating mechanism 8 can also heat the natural ester insulating oil, when the heating mechanism 8 is turned off, the natural ester insulating oil only flows through the heating mechanism 8, the heating mechanism 8 does not heat the natural ester insulating oil, only the oil filtering mechanism 3 heats the natural ester insulating oil, and the oil filtering mechanism 3 can adjust the heating temperature through monitoring of the temperature detector 7. The heating mechanism 8 can be only started to heat the natural ester insulating oil, the heating temperature is monitored by the temperature detector 7, and the heating temperature can also be adjusted.
The heating mechanism 8 is communicated with the oil pipe 9 between the first container 1 and the oil filtering mechanism 3 through two oil pipes 9, so that the natural ester insulating oil firstly flows into the heating mechanism 8, the natural ester insulating oil heated by the heating mechanism 8 flows to the oil filtering mechanism 3 again, and at the moment, the oil filtering operation can be carried out without starting a heater in the oil filtering mechanism 3.
The heating mechanism 8 can heat the natural ester insulating oil in the oil pipe 9 to enable the temperature of the natural ester insulating oil to meet the oil filtering requirement, generally, the temperature of the natural ester insulating oil is preferably maintained at 80 ℃, and the oil filtering requirement can be met, if the temperature of the natural ester insulating oil is not 80 ℃, the control mechanism 5 controls the heating mechanism 8 to continue heating the natural ester insulating oil, and if the temperature of the natural ester insulating oil reaches 80 ℃, the heating mechanism 8 is stopped to enable the temperature of the natural ester insulating oil to be maintained at about 80 ℃.
In a specific embodiment, the heating mechanism 8 is respectively communicated with the oil pipe 9 between the first container 1 and the oil filtering mechanism 3 through two oil pipes 9, wherein one oil pipe is an oil inlet pipe, and the other oil pipe is an oil outlet pipe.
The heating mechanism 8 is an air electric heater which can generate high-temperature air to exchange and heat the natural ester insulating oil, or the heating mechanism 8 is an exchanger which can exchange heat with the natural ester insulating oil to heat the natural ester insulating oil, and the heated natural ester insulating oil can be discharged to the oil filtering mechanism 3. The heating mechanism 8 is provided with an electromagnetic control switch which is electrically connected with the control mechanism 5, the control mechanism 5 can control the on or off of the electromagnetic control switch, so that the on or off of the heating mechanism 8 can be controlled, the control mechanism 5 can control the on or off of the heating mechanism 8, the operation is simple, manual operation is not needed, and the temperature of the natural ester insulating oil in the oil pipe 9 is kept stable.
Referring to fig. 1 to 3, as an embodiment of the method for vacuum filtering natural ester insulating oil for a transformer provided by the present invention, an electric valve is disposed on an end of an oil pipe 9, and the electric valve is electrically connected to a control mechanism 5. The electric control valve can be automatically opened and closed, and the natural ester insulating oil is prevented from flowing backwards under the control of the control mechanism 5.
In a particular embodiment, the electrically operated valve is a check valve or a one-way valve.
As a specific embodiment of the method for vacuum oil filtration of natural ester insulating oil for a transformer provided by the present invention, please refer to fig. 1 to 3, the control mechanism 5 includes a display, an information receiving module, an information determining module, a control module and a first wireless communication module, the information receiving module receives information detected by the pressure detector 6 and the temperature detector 7, the information determining module determines whether the detected information meets the oil filtration requirement of natural ester insulating oil, the control module controls the oil filtration mechanism 3, the nitrogen mechanism 4 and the heating mechanism 8 to be opened and closed, and the first wireless communication module realizes real-time wireless communication with external equipment.
The pressure and the temperature detected by the pressure detector 6 and the temperature detector 7 can be sent to an information receiving module on the control mechanism 5, the information receiving module receives the information, and then the information receiving module analyzes and judges the received information through an information judging module, and if the oil filtering requirement is met, the oil filtering mechanism 3, the nitrogen mechanism 4 and the heating mechanism 8 are not executed; if the oil filtering requirement is not met, the information judgment module sends an instruction to the control module, and then the oil filtering mechanism 3, the nitrogen mechanism 4 and the heating mechanism 8 are executed, so that the natural ester insulating oil in the oil path meets the oil filtering requirement.
The display is the capacitive display screen, can show that air pressure information, air temperature information and air humidity information detected to can show current air parameter value, the artificial observation this parameter value of being convenient for, the display shows more clearly, the convenient observation.
Referring to fig. 1 to 3, the control mechanism 5 further includes a mobile terminal 10 having a second wireless communication module, and the control mechanism 5 and the mobile terminal 10 are wirelessly connected through real-time wireless communication between the first wireless communication module and the second wireless communication module.
In a specific embodiment, the first wireless communication module and the second wireless communication module both include a 3G or 4G network for connecting wireless communication and a SIM card interface inserted with a SIM card, the mobile terminal 10 is provided with a storage battery, the control mechanism 5 is also provided with a storage battery, the first wireless communication module and the second wireless communication module are wirelessly connected through the 3G or 4G network, the 3G or 4G network has high communication speed and no clamping stagnation or pause, and the functions of remote control and interactive communication can be realized.
The first wireless communication module and the second wireless communication module can be in wireless connection with each other, the purpose of signal transmission is achieved, signals received by the control mechanism 5 can be wirelessly transmitted to the mobile terminal 10, real-time signals can be seen on the mobile terminal 10, workers can observe the mobile terminal 10 by holding the mobile terminal 10 by hands without going to the site, the current natural ester insulating oil parameters can be seen, the operation is flexible, and the purpose of wireless observation is achieved.
Referring to fig. 1 to 3, the control mechanism 5 further includes an alarm module, and the alarm module is electrically connected to the control module, and the alarm module can send an alarm signal when the control mechanism 5 is abnormal. The alarm module is electrically connected with the control module and can generate an alarm signal, and when the heating temperature of the natural ester insulating oil detected by the detection assembly does not meet the oil filtering requirement, the alarm module on the control mechanism 5 sends out the alarm signal to remind a worker of paying attention.
In a specific embodiment, the alarm module comprises an LED flash lamp and a loudspeaker, and when the heating temperature of the natural ester insulating oil does not meet the requirement of oil filtering, the LED flash lamp and the loudspeaker can synchronously send out alarm signals to remind workers of the condition.
As a specific embodiment of the method for vacuum oil filtering of natural ester insulating oil for a transformer provided by the present invention, referring to fig. 1 to 3, if the temperature of the natural ester insulating oil does not meet the oil filtering requirement, an oil inlet on the oil filtering mechanism 3 is connected to an oil outlet of the second container 2, an oil outlet on the oil filtering mechanism 3 is connected to an oil inlet of the first container 1, the natural ester insulating oil in the second container 2 flows into the first container 1 after being heated and filtered by the oil filtering mechanism 3, and in addition, the heating mechanism 8 is installed on an oil pipe 9 between the oil filtering mechanism 3 and the second container 2, and the natural ester insulating oil flowing out of the second container 2 is heated, so that the heating temperature of the natural ester insulating oil by the oil filtering mechanism 3 or the heating temperature of the natural ester insulating oil by the heating mechanism 8 meets the oil filtering requirement; if the temperature of the natural ester insulating oil does not meet the oil filtering requirement, the natural ester insulating oil is heated back and forth through the oil filtering mechanism 3, and meanwhile, the nitrogen mechanism 4 maintains the stable nitrogen pressure in the first container 1 and the second container 2.
The invention relates to a method for filtering natural ester insulating oil in vacuum for a transformer, which mainly comprises the following operation processes:
respectively communicating an oil pipe 9 with a first container 1, an oil filtering mechanism 3 and a second container 2, installing a heating mechanism 8 on the oil pipe 9 at the front end of the oil filtering mechanism 3, starting the oil filtering mechanism 3 to enable the natural ester insulating oil in the first container 1 to flow to the oil filtering mechanism 3, and enabling the natural ester insulating oil after passing through the oil filtering mechanism 3 to flow to the second container 2; or the natural ester insulating oil is heated by the heating mechanism 8 and then flows to the oil filtering mechanism 3;
the nitrogen mechanism 4 is respectively connected with the first container 1 and the second container 2, the nitrogen mechanism 4 is started, the pressure detector 6 is inserted in the first container 1 and the second container 2 and is connected with the control mechanism 5, so that the pressure value of the nitrogen in the first container 1 and the pressure value of the nitrogen in the second container 2 are kept stable;
the temperature detector 7 is inserted in the oil filtering mechanism 3 and connected with the control mechanism 5, so that the heating temperature of the natural ester insulating oil in the oil filtering mechanism 3 or the heating temperature of the natural ester insulating oil by the heating mechanism 8 is kept stable, and the natural ester insulating oil meets the oil filtering requirement;
opening and closing of the oil filtering mechanism 3, the nitrogen mechanism 4 and the heating mechanism 8 are controlled through nitrogen pressure information detected by the pressure detector 6 and temperature information of the natural ester insulating oil detected by the temperature detector 7, so that the temperature of the natural ester insulating oil and the pressure value of the nitrogen meet the oil filtering requirement;
if the temperature of the natural ester insulating oil does not meet the oil filtering requirement, an oil inlet on the oil filtering mechanism 3 is connected with an oil outlet of the second container 2, an oil outlet on the oil filtering mechanism 3 is connected with an oil inlet of the first container 1, the heating mechanism 8 is arranged on a front-end oil pipe 9 of the oil filtering mechanism 3, the natural ester insulating oil in the second container 2 flows into the first container 1 after being heated and filtered by the oil filtering mechanism 3, and the heating temperature of the natural ester insulating oil flowing into the oil filtering mechanism 3 or the heating mechanism 8 for the natural ester insulating oil meets the oil filtering requirement;
and if the pressure value of the nitrogen in the first container 1 or the second container 2 does not meet the oil filtering requirement, controlling the nitrogen charging/discharging amount of the nitrogen mechanism 4.
The method for filtering the natural ester insulating oil for the transformer in vacuum has the beneficial effects that: compared with the prior art, the method for vacuum oil filtering of the natural ester insulating oil for the transformer can heat and filter the natural ester insulating oil in the first container 1 and the second container 2 and charge and discharge nitrogen after the oil filtering mechanism 3 and the nitrogen mechanism 4 are opened, the pressure of the nitrogen in the first container 1 and the pressure of the nitrogen in the second container 2 are balanced, the pressure of the nitrogen in the air pipe 11 is kept stable, the natural ester insulating oil is effectively isolated from oxygen and is not easy to oxidize, and the heating temperature of the natural ester insulating oil meets the oil filtering requirement.
Specifically, the oil filtering mechanism 3 can heat the natural ester insulating oil, wherein the heating mechanism 8 can also heat the natural ester insulating oil, when the heating mechanism 8 is turned off, the natural ester insulating oil only flows through the heating mechanism 8, the heating mechanism 8 does not heat the natural ester insulating oil, only the oil filtering mechanism 3 heats the natural ester insulating oil, and the oil filtering mechanism 3 can adjust the heating temperature through monitoring of the temperature detector 7. The heating mechanism 8 can be only started to heat the natural ester insulating oil, the heating temperature is monitored by the temperature detector 7, and the heating temperature can also be adjusted.
Specifically, the oil filtering method is applicable to various raw materials of natural fat vegetable oil for transformers, including but not limited to soybean oil, rapeseed oil, palm oil, camellia oil, and the like. In the oil filtering and storing process, the upper part of the storage container is filled with nitrogen or vacuumized, so that the contact with air is avoided. The temperature of the natural fat insulating oil vacuum filter oil for the transformer is about 80 ℃, which is about 20 ℃ higher than the temperature of the hydrocarbon mineral insulating oil commonly used by the transformer, and each oil pipe 9 is provided with a check valve, which can effectively prevent the insulating oil from flowing back when the transformer is shut down and disassembled or the oil filter fails.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for filtering natural ester insulating oil for a transformer in vacuum is characterized by comprising the following steps:
arranging two containers for containing natural ester insulating oil, namely a first container and a second container, and communicating the tops of the first container and the second container through an air pipe;
arranging an oil filtering mechanism, wherein the oil filtering mechanism is communicated with the first container and the second container respectively, and is used for heating and filtering the natural ester insulating oil flowing between the first container and the second container;
arranging a nitrogen mechanism to enable the nitrogen mechanism to be communicated with the air pipe, enabling the nitrogen mechanism to charge nitrogen into the air pipe or discharge the nitrogen from the air pipe, and enabling the nitrogen mechanism to keep the pressure of the nitrogen in the first container and the pressure of the nitrogen in the second container stable;
and starting the oil filtering mechanism and the nitrogen mechanism to enable the natural ester insulating oil in the first container to flow to the oil filtering mechanism, and enabling the natural ester insulating oil heated by the oil filtering mechanism to flow to the second container, so that the temperature of the natural ester insulating oil meets the oil filtering requirement.
2. The method for vacuum oil filtering of natural ester insulating oil for the transformer as claimed in claim 1, wherein a control mechanism is further provided after the nitrogen mechanism, the control mechanism is electrically connected with the oil filtering mechanism and the nitrogen mechanism respectively, and the control mechanism controls the heating temperature of the oil filtering mechanism and the nitrogen charging and discharging amount of the nitrogen mechanism.
3. The method for vacuum filtering of natural ester insulating oil for the transformer as claimed in claim 2, wherein after the control mechanism is provided, pressure detectors are provided in the first container and the second container, the pressure detectors are enabled to detect the pressure value of nitrogen gas in the first container or the second container, and the pressure detectors are electrically connected with the control mechanism.
4. The method for vacuum oil filtering of natural ester insulating oil for the transformer as claimed in claim 3, wherein after the pressure detector is arranged, a temperature detector is arranged in the oil filtering mechanism, the temperature detector is used for detecting the heating temperature of the natural ester insulating oil in the oil filtering mechanism, and the temperature detector is electrically connected with the control mechanism.
5. The method for vacuum oil filtering of natural ester insulating oil for the transformer as claimed in claim 4, wherein after the temperature detector is arranged, a heating mechanism is arranged on an oil inlet pipeline of the oil filtering mechanism, the heating mechanism and a heater in the oil filtering mechanism are operated alternately, the heating mechanism assists in heating the natural ester insulating oil flowing through, and the heating mechanism is electrically connected with the control mechanism.
6. The method as claimed in claim 2, wherein an electric valve is disposed at the end of the oil pipe, and the electric valve is electrically connected to the control mechanism.
7. The method for vacuum oil filtration of natural ester insulating oil for the transformer as claimed in claim 5, wherein the control mechanism comprises a display, an information receiving module, an information judging module, a control module and a first wireless communication module, the information receiving module receives information detected by the pressure detector and the temperature detector, the information judging module judges whether the detected information meets the oil filtration requirement of the natural ester insulating oil, the control module controls the oil filtration mechanism, the nitrogen mechanism and the heating mechanism to be opened and closed, and the first wireless communication module realizes real-time wireless communication with external equipment.
8. The method for vacuum filtering of natural ester insulating oil for a transformer as claimed in claim 7, wherein the control mechanism further comprises a mobile terminal provided with a second wireless communication module, and the control mechanism and the mobile terminal are wirelessly connected through real-time wireless communication between the first wireless communication module and the second wireless communication module.
9. The method for vacuum filtering of natural ester insulating oil for a transformer as claimed in claim 7, wherein the control mechanism further comprises an alarm module, and the alarm module is electrically connected with the control module, and the alarm module can send out an alarm signal when the control mechanism is abnormal.
10. The method according to claim 5, wherein if the temperature of the natural ester insulating oil does not meet the oil filtering requirement, the oil inlet of the oil filtering mechanism is connected with the oil outlet of the second container, the oil outlet of the oil filtering mechanism is connected with the oil inlet of the first container, the natural ester insulating oil in the second container flows into the first container after being heated and filtered by the oil filtering mechanism, and the heating mechanism is further mounted on the oil pipe between the oil filtering mechanism and the second container to heat the natural ester insulating oil flowing out of the second container, so that the heating temperature of the natural ester insulating oil by the oil filtering mechanism or the heating temperature of the natural ester insulating oil by the heating mechanism meets the oil filtering requirement; if the temperature of the natural ester insulating oil does not meet the oil filtering requirement, the natural ester insulating oil is heated back and forth through the oil filtering mechanism, and meanwhile, the nitrogen mechanism maintains the stable nitrogen pressure in the first container and the second container.
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| CN201911194318.7A CN111111315A (en) | 2019-11-28 | 2019-11-28 | Method for vacuum filtering of natural ester insulating oil for transformer |
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| CN201911194318.7A CN111111315A (en) | 2019-11-28 | 2019-11-28 | Method for vacuum filtering of natural ester insulating oil for transformer |
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Cited By (1)
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| CN112557993A (en) * | 2020-11-13 | 2021-03-26 | 广东电网有限责任公司广州供电局 | Vegetable oil transformer thermal fault simulation system based on eddy current heating |
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