阅读说明：本技术 一种智能油浸变压器补油方法 (Intelligent oil-immersed transformer oil supplementing method ) 是由 崔荣华 潘宝珠 李红兵 赵永林 于 2021-06-29 设计创作，主要内容包括：本发明涉及一种智能油浸变压器补油方法,观察控油器的浮子所受浮力,通过连通器原理,控油罐内变压器油油位变化使得浮子浸没变压器油内体积发生变化,此时浮杆上下移动,油塞对补油孔进行密封及断开操作；本发明操作简便,实现对变压器的自动补油操作,同时在变压器发生异常情况时发出警示。(The invention relates to an intelligent oil-immersed transformer oil supplementing method, which comprises the steps of observing buoyancy borne by a floater of an oil controller, changing the volume of the floater immersed in transformer oil through the change of the oil level of the transformer oil in an oil control tank according to the principle of a communicating vessel, moving a floating rod up and down at the moment, and sealing and disconnecting an oil supplementing hole by an oil plug; the invention has simple and convenient operation, realizes the automatic oil supplement operation of the transformer, and simultaneously gives out warning when the transformer is in abnormal condition.)

1. An intelligent oil-immersed transformer oil supplementing method is characterized in that: the method specifically comprises the following steps:

firstly, a floating rod top (44) end of an oil controller (4) penetrates through an oil control tank cover (3) and extends into an oil storage tank (6), the floating rod top (44) is embedded into a cavity of an oil level lower limit frame (51), and a floater (41) of the oil controller (4) is arranged in an oil supplementing tank;

secondly, sequentially sleeving a safety plug (423), an upper plug (422) and a bottom plug (421) of the oil plug (42) on a floating rod (43) from the oil storage tank cover (5) to the bottom of the oil storage tank (6) in a sleeving manner, adjusting the floating rod (43), and enabling the oil plug (42) to be embedded into an oil supplementing hole (31) of the oil control tank cover (3);

thirdly, two electrodes are arranged at the position, corresponding to the floating rod top (44) of the oil controller (4), of the oil level lower limit frame (51), a conducting wire is embedded at the position, corresponding to the oil level lower limit frame (51), of the floating rod top (44), and when the floating rod top (44) is in contact with the oil level lower limit frame (51), the two electrodes are communicated with an alarm through the conducting wire;

fourthly, two electrodes are arranged at the position of the oil storage tank cover (5) corresponding to the floating rod top (44), a lead is embedded at the position of the floating rod top (44) corresponding to the oil storage tank cover (5), and when the floating rod top (44) is contacted with the oil storage tank cover (5), the two electrodes are communicated with an alarm through the lead;

fifthly, connecting an oil delivery pipe (8) and an exhaust pipe (9) between the oil control tank (7) and the transformer (1) to form a communicating vessel;

sixthly, monitoring the buoyancy borne by a floater (41) of the oil control tank (4), and controlling the oil level change of transformer oil in the oil control tank (7) to enable the floater (41) to immerse the transformer (1) and change the volume in the oil, wherein the floating rod (43) moves up and down at the moment, and the oil plug (42) seals and disconnects the oil supplementing hole (31) according to the principle of a communicating vessel.

2. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: and sixthly, when the transformer oil is stored in the oil storage tank (6), the transformer oil in the transformer (1) is sufficient, the oil level of the transformer oil in the oil control tank (7) is far away from a supercritical line, the floater (41) is immersed in the transformer oil and has large volume, the buoyancy force borne by the floater (41) is larger than the gravity of the oil controller (4) and the pressure of the transformer oil in the oil storage tank (6) on an oil plug (42), the floating rod (43) moves towards the oil storage tank (6), the oil plug (42) is plugged into the oil supplementing hole (31), at the moment, the upper plug (422) seals the upper plug hole, the bottom plug (421) seals the bottom plug hole, the transformer oil in the oil storage tank (6) does not continuously flow into the oil control tank (7), and the oil level of the transformer in the oil control tank (7) is kept unchanged.

3. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: in the sixth step, when transformer oil is stored in the oil storage tank (6), the transformer oil in the transformer (1) is gradually reduced, the transformer oil level in the oil control tank (7) is close to a critical line, the floater (41) is immersed in the transformer oil, the volume of the floater is gradually reduced, the buoyancy force borne by the floater (41) is smaller than the gravity of the oil controller (4) and the pressure of the transformer oil in the oil storage tank (6) on an oil plug (42), the floating rod (43) moves towards the bottom of the oil supplement tank, the oil plug (42) is far away from the oil supplement hole (31), the transformer oil in the oil storage tank (6) flows into the oil control tank (7) and is supplemented into the transformer (1) through the oil delivery pipe (8);

the oil level of the transformer oil in the oil control tank (7) rises, the position of a floating rod (43) of the oil controller (4) moves upwards, an oil plug (42) is plugged into the oil supplementing hole (31), the position of the oil controller (4) does not move upwards, if a small amount of transformer oil flows into the oil control tank (7), the volume of the floater (41) of the oil controller (4) immersed in the transformer oil is increased, the oil plug (42) continues to plug the oil supplementing hole (31), and the transformer oil in the transformer (1) is in a sufficient state.

4. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: and sixthly, when the transformer oil is not stored in the oil storage tank (6) and the transformer oil in the transformer (1) is reduced, the oil level of the transformer oil in the oil control tank (7) is reduced, the floating rod (43) of the oil controller (4) moves towards the bottom of the oil control tank (7) until the top (44) of the floating rod is contacted with the oil level lower limit frame (51), two electrodes positioned on the oil level lower limit frame (51) are communicated with the alarm, and an alarm is triggered to give an alarm for oil supplement.

5. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: the transformer oil contains particle impurities, so that the oil plug (42) and the oil supplementing hole (31) cannot be attached and sealed, when one of the upper plug (422) or the bottom plug (421) of the oil plug (42) fails to seal, the other one continues to seal the oil supplementing hole (31), and at the moment, the oil storage tank (6) is disconnected from the oil control tank (7);

when the upper plug (422) and the bottom plug (421) of the oil plug (42) are sealed and failed, transformer oil in the oil storage tank (6) continuously flows into the oil control tank (7), the oil level of the transformer oil in the oil control tank (7) continuously rises, the volume of a floater (41) immersed in the transformer oil is continuously increased, the floating rod (43) continuously moves towards the oil storage tank (6), the bottom plug (421) and the upper plug (422) deform in the oil supplementing hole (31), the safety plug (423) is embedded into the safety plug hole, the top (44) of the floating rod is in contact with the oil storage tank cover (5), two electrodes positioned on the bottom surface of the oil storage tank cover (5) are communicated with the alarm, and an alarm is triggered to send an alarm needing oil control.

6. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: the oil control tank cover is characterized in that a limiting frame (32) is fixedly installed at the center of the bottom surface of the oil control tank cover (3), a limiting hole is formed in the limiting frame (32), a floating rod (43) penetrates through the limiting hole, and an oil plug (42) moves in a cavity formed by the limiting frame (32) and the oil control tank cover (3) along with the movement of the floating rod (43).

7. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: the cavity of the oil level lower limit frame (51) is arranged in a conical structure, and the conical top of the conical structure faces the bottom of the oil storage tank (6);

the floating rod top (44) is of a conical structure, the conical top of the floating rod top (44) also faces the bottom of the oil storage tank (6), and the floating rod top (44) and the cavity of the oil level lower limit frame (51) are arranged in a matched mode.

8. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: an exhaust outer hole (34) is formed in the circumferential wall of the oil control tank cover (3), an exhaust inner hole (33) is formed in the bottom surface of the oil control tank cover (3), and the exhaust outer hole (34) is communicated with the exhaust inner hole (33).

9. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: the oil storage tank cover (5) is provided with a through oil filling hole (52).

10. The intelligent oil-immersed transformer oil supplementing method according to claim 1, wherein: an observation window is arranged on the tank body of the oil storage tank (6) and used for observing the oil level in the oil storage tank (6).

Technical Field

The invention relates to an intelligent oil-immersed transformer oil supplementing method, and belongs to the field of transformers.

Background

In the practical process, a transformer oil supplementing device is developed, such as application No. 201410724926.5, and comprises an oil tank, wherein an inner gear pump is installed in the oil tank, an oil inlet of the inner gear pump is positioned at the bottom of the oil tank, an oil outlet of the inner gear pump is communicated with one end of an oil pipe, the other end of the oil pipe extends out of the oil tank, a driving shaft of the inner gear pump is in transmission connection with one end of a transmission connecting rod, and the other end of the transmission connecting rod extends out of the oil tank and is connected with a crank, so that the inner gear pump can be driven by rotating the crank; when the oil supplementing device is used, transformer oil is filled in an oil tank of the oil supplementing device, the tail end of an oil pipe is taken down and extends into an oil filling port of a transformer, then the crank is rotated manually, an oil outlet of the crescent gear pump can be driven to fill the transformer with the oil, and the crank is rotated reversely to pump the oil, so that the oil supplementing device for the transformer is convenient to use, but cannot achieve intelligent oil supplementing operation.

Therefore, an oil supplementing method suitable for an oil immersed transformer is urgently needed, the oil level of the oil immersed transformer can be automatically controlled unattended, and if the oil is lack or abnormal, an alarm can be automatically prompted, so that the oil supplementing method is better.

Disclosure of Invention

The invention provides an intelligent oil-immersed transformer oil supplementing method which is simple and convenient to operate, realizes automatic oil supplementing operation on a transformer, and gives out a warning when the transformer is in an abnormal condition.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an intelligent oil-immersed transformer oil supplementing method specifically comprises the following steps:

the method comprises the following steps that firstly, the top end of a floating rod of an oil controller penetrates through an oil control tank cover and extends into an oil storage tank, the top of the floating rod is embedded into a cavity of an oil level lower limit frame, and a floater of the oil controller is arranged in an oil supplementing tank;

secondly, sequentially sleeving a safety plug, an upper plug and a bottom plug of the oil plug on a floating rod from the oil storage tank cover to the bottom of the oil storage tank, adjusting the floating rod, and embedding the oil plug into an oil supplementing hole of an oil control tank cover;

thirdly, two electrodes are arranged at the position, opposite to the floating rod top of the oil controller, of the oil level lower limit frame, a conducting wire is embedded at the position, opposite to the oil level lower limit frame, of the floating rod top, and when the floating rod top is in contact with the oil level lower limit frame, the two electrodes are communicated with an alarm through the conducting wire;

fourthly, two electrodes are arranged at the position of the oil storage tank cover opposite to the top of the floating rod, a conducting wire is embedded at the position of the floating rod top opposite to the oil storage tank cover, and when the top of the floating rod is contacted with the oil storage tank cover, the two electrodes are communicated with the alarm through the conducting wire;

fifthly, connecting an oil pipeline and an exhaust pipe between the oil control tank and the transformer to form a communicating vessel;

sixthly, monitoring buoyancy borne by a floater of the oil control device, controlling the change of the oil level of transformer oil in the oil control tank to enable the volume of the transformer oil immersed by the floater to change according to the principle of a communicating vessel, moving the floating rod up and down at the moment, and sealing and disconnecting the oil supplementing hole by the oil plug;

as a further preferable mode of the present invention, in the sixth step, when the transformer oil is stored in the oil storage tank, the transformer oil in the transformer is sufficient, the oil level of the transformer oil in the oil control tank is far away from a supercritical line, the float is immersed in the transformer oil and has a large volume, the buoyancy force applied to the float is greater than the gravity of the oil controller and the pressure of the transformer oil in the oil storage tank on the oil plug, the float rod moves towards the oil storage tank, the oil plug is plugged into the oil supply hole, at this time, the upper plug seals the upper plug hole, the bottom plug seals the bottom plug hole, the transformer oil in the oil storage tank does not continuously flow into the oil control tank, and the oil level of the transformer oil in the oil control tank remains unchanged;

as a further preferable mode of the present invention, in the sixth step, when the transformer oil is stored in the oil storage tank, the transformer oil in the transformer is gradually reduced, the oil level of the transformer oil in the oil control tank is close to a critical line, the volume of the float immersed in the transformer oil is gradually reduced, the buoyancy force applied to the float is smaller than the gravity of the oil control device and the pressure of the transformer oil in the oil storage tank on the oil plug, the floating rod moves towards the bottom of the oil supply tank, the oil plug is far away from the oil supply hole, the transformer oil in the oil storage tank flows into the oil control tank, and the transformer oil is supplemented into the transformer through the oil delivery pipe;

the oil level of the transformer oil in the oil control tank rises, the position of a floating rod of the oil controller moves upwards, an oil plug is plugged into the oil supplementing hole, the oil controller does not move upwards any more, if a small amount of transformer oil flows into the oil control tank, the volume of the floater of the oil controller immersed in the transformer oil is increased, the oil plug continues to plug the oil supplementing hole, and the transformer oil in the transformer returns to a sufficient state;

as a further preferable mode of the invention, in the sixth step, when the transformer oil is not stored in the oil storage tank and the transformer oil in the transformer is reduced, the oil level of the transformer oil in the oil control tank is reduced, the floating rod of the oil controller moves towards the bottom of the oil control tank until the top of the floating rod is contacted with the oil level lower limit frame, two electrodes positioned on the oil level lower limit frame are communicated with the alarm, and an alarm is triggered to send an alarm needing oil supplement;

as a further preferred aspect of the present invention, the transformer oil contains particle impurities, which results in that the oil plug and the oil supply hole cannot be attached and sealed, and when one of the upper plug and the bottom plug of the oil plug fails to seal, the other one continues to seal the oil supply hole, and at this time, the oil storage tank is disconnected from the oil control tank;

when the upper plug and the bottom plug of the oil plug are sealed and failed, transformer oil in the oil storage tank continuously flows into the oil control tank, the oil level of the transformer oil in the oil control tank continuously rises, the volume of a floater immersed in the transformer oil is continuously increased, the floating rod continuously moves towards the direction of the oil storage tank, the bottom plug and the upper plug deform in the oil supplementing hole, the safety plug is embedded into the safety plug hole, the top of the floating rod is contacted with the oil storage tank cover at the moment, two electrodes positioned on the bottom surface of the oil storage tank cover are communicated with the alarm, and an alarm is triggered to send an alarm needing oil control;

as a further preferred aspect of the invention, a limiting frame is fixedly mounted at the center of the bottom surface of the oil control tank cover, a limiting hole is formed in the limiting frame, the floating rod penetrates through the limiting hole, and the oil plug moves in a cavity formed by the limiting frame and the oil control tank cover along with the movement of the floating rod;

as a further preferable mode of the invention, the cavity of the oil level lower limit frame is arranged in a conical structure, and the conical top of the conical structure faces the bottom of the oil storage tank;

the top of the floating rod is of a conical structure, the conical top of the floating rod also faces the bottom of the oil storage tank, and the top of the floating rod is matched with the cavity of the oil level lower limit frame;

as a further preferred aspect of the present invention, the circumferential wall of the oil control tank cover is provided with an outer exhaust hole, the bottom surface of the oil control tank cover is provided with an inner exhaust hole, and the outer exhaust hole is communicated with the inner exhaust hole;

as a further preferable aspect of the present invention, a through oil hole is provided in the oil storage tank cover;

as a further preferred aspect of the present invention, an observation window is provided in the oil storage tank body for observing the oil level in the oil storage tank.

Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:

1. the oil supplementing method provided by the invention realizes the effect of the communicating vessel by utilizing the oil conveying pipe and the exhaust pipe which are arranged between the oil control tank and the transformer, and controls the on-off of the oil supplementing hole of the oil control tank cover through the change of the oil level of the transformer in the oil control tank, thereby achieving the purpose of adjusting the oil level of the transformer in the transformer;

2. the electrodes are arranged on the contact part of the oil level lower limit frame and the floating rod top and the contact part of the oil storage tank cover and the floating rod top, and are communicated with the matching alarm through the electrodes in the oil supplementing process, so that the alarm is given to the abnormal information of oil shortage or oil control in real time.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a perspective view of a preferred embodiment provided by the present invention;

FIG. 2 is a schematic view of the internal structure of an oil control tank according to a preferred embodiment of the present invention;

FIG. 3 is a schematic view of the bottom of a preferred embodiment of the oil control tank lid provided in accordance with the present invention;

FIG. 4 is a schematic diagram of an oil control device according to a preferred embodiment of the present invention;

FIG. 5 is a schematic view of the preferred embodiment of the present invention showing the connection of the oil control device to the cover of the oil storage tank;

FIG. 6 is a schematic diagram of the connection of an oil control device and an oil control tank cover according to a preferred embodiment of the present invention;

fig. 7 is a schematic structural diagram of the oil plug and the oil filling hole in the preferred embodiment of the invention after being matched.

In the figure: 1 is the transformer, 2 is the oil supplementing device body, 3 is the oil control cover, 31 is the oil supplementing hole, 32 is the spacing, 33 is the exhaust hole, 34 is the exhaust outer bore, 4 is the oil controller, 41 is the float, 42 is the oil plug, 421 is the bottom stopper, 422 is the upper stopper, 423 is the safety plug, 43 is the floating rod, 44 is the floating rod top, 5 is the oil storage tank cover, 51 is the oil level lower limit frame, 52 is the oil filler point, 6 is the oil storage tank, 7 is the oil control jar, 8 is defeated oil pipe, 9 is the blast pipe.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. In the description of the present application, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the scope of protection of the present invention.

At present, when the transformer is subjected to oil supplementing maintenance, all adopted methods are passive oil supplementing methods, so that the intelligent oil supplementing method is provided, and real-time alarm can be given to oil shortage or oil control abnormal information while automatic oil supplementing is realized.

The specific oil supplementing method comprises the following steps: the method comprises the following steps that firstly, the top end of a floating rod of an oil controller penetrates through an oil control tank cover and extends into an oil storage tank, the top of the floating rod is embedded into a cavity of an oil level lower limit frame, and a floater of the oil controller is arranged in an oil supplementing tank;

secondly, sequentially sleeving a safety plug, an upper plug and a bottom plug of the oil plug on a floating rod from the oil storage tank cover to the bottom of the oil storage tank, adjusting the floating rod, and embedding the oil plug into an oil supplementing hole of an oil control tank cover;

thirdly, two electrodes are arranged at the position, opposite to the floating rod top of the oil controller, of the oil level lower limit frame, a conducting wire is embedded at the position, opposite to the oil level lower limit frame, of the floating rod top, and when the floating rod top is in contact with the oil level lower limit frame, the two electrodes are communicated with an alarm through the conducting wire;

fourthly, two electrodes are arranged at the position of the oil storage tank cover opposite to the top of the floating rod, a conducting wire is embedded at the position of the floating rod top opposite to the oil storage tank cover, and when the top of the floating rod is contacted with the oil storage tank cover, the two electrodes are communicated with the alarm through the conducting wire;

fifthly, connecting an oil pipeline and an exhaust pipe between the oil control tank and the transformer to form a communicating vessel;

and sixthly, monitoring the buoyancy borne by the floater of the oil control device, controlling the change of the oil level of the transformer oil in the oil control tank to change the volume of the transformer oil immersed by the floater according to the principle of a communicating vessel, moving the floating rod up and down at the moment, and sealing and disconnecting the oil supplementing hole by the oil plug.

When a specific oil supplementing method is explained, firstly, a structure used in the oil supplementing method is analyzed, fig. 1 is an integral structure of the embodiment provided by the application, an oil supplementing device body 2 is an oil storage tank 6 and an oil control tank 7 in the drawing, an oil control tank cover 3 covers an opening of the oil control tank, the bottom of the oil storage tank is fixedly arranged on the surface of the oil control tank cover, and an oil storage tank cover 5 covers the opening of the oil storage tank; an exhaust pipe 9 and an oil delivery pipe 8 are arranged between the oil control tank and the transformer 1, and the oil delivery pipe is positioned below the exhaust pipe in order to use the communicating vessel principle conveniently.

The structure for realizing the oil control purpose of the present application is an oil controller 4, which has a structure shown in fig. 4, and comprises a floating rod 43, the bottom end of the floating rod is vertically arranged on the surface of a float 41, the top end of the floating rod is provided with a floating rod top 44, when the oil storage tank is matched with an oil control tank for use, as shown in figure 2, the top end of the floating rod penetrates through the oil control tank cover and extends into the oil storage tank, the oil level lower limit frame 51 is installed at the center of the bottom surface of the oil storage tank cover, the top end of the floating rod penetrates through the oil level lower limit frame, the floating rod is arranged in a cavity formed by the oil level lower limit frame and the oil storage tank cover in an overhead mode, an oil plug is arranged at the contact part of the floating rod and the oil control tank cover (here, an oil supplementing hole 31 formed in the oil control tank cover), and the oil plug is based on a communicating vessel principle, the float is used for receiving buoyancy force, the change of the oil level of the transformer in the oil control tank is used for controlling the on-off of the oil supplementing hole of the oil control tank cover, the oil control tank is connected with the transformer through the exhaust pipe, and the purpose of adjusting the oil level of the transformer in the transformer is achieved by utilizing the communicating vessel principle.

The oil level of the transformer oil in the transformer is adjusted through the oil controller, but when the oil in the transformer is more or less, the oil level can not be found by an operator in time, and in order to ensure that the operator can find abnormality in real time, the oil level lower limit frame and other structures are processed, as shown in fig. 5, a cavity of the oil level lower limit frame is arranged in a conical structure, and the conical top of the conical structure faces to the bottom of the oil storage tank; the top of the floating rod is of a conical structure, the conical top of the floating rod also faces the bottom of the oil storage tank, and the top of the floating rod is matched with the cavity of the oil level lower limit frame; two electrodes are arranged at the conical top of a cavity of the oil level lower limit frame, a lead is embedded in the conical top of the floating rod top, the two electrodes are arranged for alarming when the oil level of the transformer oil in the transformer is lower than a critical value, and particularly, when the floating rod top is contacted with the oil level lower limit frame, the two electrodes are communicated with an alarm through the lead to send out an oil supplement alarm; two electrodes are arranged on the bottom surface of the oil storage tank cover, a lead is embedded in the conical bottom of the top of the floating rod, the two electrodes are arranged and used for alarming when transformer oil in the transformer is abnormal, and specifically, when the top of the floating rod is in contact with the oil storage tank cover, the two electrodes are communicated with the alarm through the lead to send out an oil control abnormal alarm.

In the above mentioned sealing structure, as shown in fig. 6, an oil supplementing hole is formed in the center of the oil control tank cover, and in order to ensure the sealing performance, a preferred structure is provided herein, as can be seen from fig. 7, the oil supplementing hole includes a safety plug hole, an upper plug hole and a bottom plug hole which are sequentially communicated, the safety plug hole is located on the surface of the oil control tank cover, and the hole diameters of the safety plug hole, the upper plug hole and the bottom plug hole are sequentially enlarged; the oil plug 42 includes a safety plug 423, an upper plug 422 and a bottom plug 421 (fig. 4 shows a schematic diagram after related sleeving is provided) which are sequentially sleeved on the floating rod, the diameters of the safety plug, the upper plug and the bottom plug are gradually increased, when the oil plug is embedded into the oil supplementing hole, the upper plug is matched with the upper plug hole, the bottom plug is matched with the bottom plug hole, and a gap is formed between the safety plug and the safety plug hole. Here, the upper plug and the bottom plug are used as sealing structures to seal the first layer of the oil supplementing hole, at this time, fig. 7 shows that a gap exists between the safety plug and the safety plug hole, and when the upper plug and the bottom plug fail, the safety plug is plugged into the safety plug hole, so that the sealing structure seals the second layer of the oil supplementing hole.

As shown in fig. 6, a limiting frame 32 is fixedly installed at the center of the bottom surface of the oil control tank cover, a limiting hole is formed in the limiting frame, the floating rod penetrates through the limiting hole, and the oil plug moves in a cavity formed by the limiting frame and the oil control tank cover along with the movement of the floating rod, so that the oil plug is limited.

As the oil level of the transformer oil in the transformer is changed all the time, the air pressure in the oil control tank is driven to be unstable, so that an outer exhaust hole 34 is formed in the circumferential wall of the oil control tank cover, an inner exhaust hole 33 is formed in the bottom surface of the oil control tank cover, and the outer exhaust hole is communicated with the inner exhaust hole, so that the air pressure in the oil control tank is balanced.

An oil storage tank cover 5 covers the tank opening of the oil storage tank, and a through oil filling hole 52 (marked in figure 5) is formed in the oil storage tank cover, so that oil can be timely supplemented to the oil storage tank; in order to assist in observing the conditions in the oil storage tank, an observation window is arranged on the oil storage tank body and used for observing the oil level in the oil storage tank.

In the oil supplementing method provided by the application, the following conditions are specifically provided in the sixth step, when transformer oil is stored in the oil storage tank, the transformer oil in the transformer is sufficient, the oil level of the transformer oil in the oil control tank is far away from a supercritical line, the volume of the floater immersed in the transformer oil is large, the buoyancy force borne by the floater is larger than the gravity of the oil controller and the pressure of the transformer oil in the oil storage tank on an oil plug, the floating rod moves towards the oil storage tank, the oil plug is plugged into the oil supplementing hole, the upper plug seals the upper plug hole, the bottom plug seals the bottom plug hole, the transformer oil in the oil storage tank does not continuously flow into the oil control tank, and the oil level of the transformer oil in the oil control tank is kept unchanged.

When transformer oil is stored in the oil storage tank, the transformer oil in the transformer is gradually reduced, the oil level of the transformer oil in the oil control tank is close to a critical line, the volume of a floater immersed in the transformer oil is gradually reduced, the buoyancy force borne by the floater is smaller than the gravity of an oil controller and the pressure of the transformer oil in the oil storage tank on an oil plug, a floating rod moves towards the bottom of the oil supplementing tank, the oil plug is far away from an oil supplementing hole, and the transformer oil in the oil storage tank flows into the oil control tank and then is supplemented into the transformer through an oil delivery pipe;

the oil level of the transformer oil in the oil control tank rises, the position of a floating rod of the oil controller moves upwards, the oil plug is plugged into the oil supplementing hole, the oil controller does not move upwards any more, if a small amount of transformer oil flows into the oil control tank, the volume of the floater of the oil controller immersed in the transformer oil is increased, the oil plug continues to plug the oil supplementing hole, and the transformer oil in the transformer returns to a sufficient state.

When transformer oil is not stored in the oil storage tank and is reduced, the oil level of the transformer in the oil control tank is reduced, the floating rod of the oil controller moves towards the bottom of the oil control tank until the top of the floating rod is contacted with the oil level lower limit frame, the two electrodes positioned on the oil level lower limit frame are communicated with the alarm, and the alarm is triggered to send an oil supplement warning.

The oil plug of the present application also has dual sealing, which is because if the transformer oil contains particle impurities, the oil plug and the oil supplementing hole cannot be attached and sealed, and when one of the upper plug and the bottom plug of the oil plug fails to seal, the other one continues to seal the oil supplementing hole, and at this time, the oil storage tank is disconnected from the oil control tank;

when the equal sealing failure of upper plug and bottom stopper of oil stopper, transformer oil continues to flow into in the accuse oil jar in the oil storage tank, transformer oil level constantly rises in the accuse oil jar, the volume constantly increases in the float submergence transformer oil, the float bar continues to remove to the oil storage tank direction, the bottom stopper, the upper plug takes place to warp in the oil supplementing hole, in insurance stopper embedding insurance stopcock, the float bar top contacts with the oil storage tank lid this moment, two electrodes that are located oil storage tank lid bottom surface form the intercommunication with the alarm, touch the alarm and send and need accuse oil warning, remind the user to clear up granule impurity.

In conclusion, the oil supplementing method can realize unattended automatic control of the oil level of the oil immersed transformer, and can automatically prompt an alarm if oil shortage or other abnormalities are found.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "and/or" as used herein is intended to include both the individual components or both.

The term "connected" as used herein may mean either a direct connection between components or an indirect connection between components via other components.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.