On-line oil filtering and supplementing device for voltage regulating switch of transformer

Abstract

The utility model relates to the technical field of transformer maintenance equipment, and discloses an on-line oil filtering and supplementing device for a voltage regulating switch of a transformer, which comprises an on-line oil filtering component and an oil injecting and discharging component which are communicated with the voltage regulating switch together, the on-line oil filtering assembly comprises an impurity removal filter element and a water removal filter element, and oil is circularly filtered to an oil chamber of the pressure regulating switch through a pressure regulating switch manual oil drain valve V1, an on-line oil supplementing flange SV1, a circulating oil supplementing device, a manual ball valve F5, an oil pump, the impurity removal filter element, the water removal filter element, an electromagnetic valve F2, an on-line oil supplementing flange SV2 and a pressure regulating switch manual oil inlet valve V2 in sequence on an external pipeline of the pressure regulating switch; the oil injecting and discharging assembly comprises an oil supplementing retainer communicated with a circulating oil supplementing device, the circulating oil supplementing device comprises a shell made of hard metal, and an oil storage capsule capable of being flexibly deformed is arranged in the shell. According to the oil filtering system, oil is supplemented through pressure difference while oil products are filtered online, and meanwhile, a new oil supplementing and discharging process is achieved through the design of the circulating oil supplementing device with the variable volume in the oil filtering system.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer maintenance equipment, in particular to an online oil filtering and oil replenishing device for a transformer voltage regulating switch. Background Art

[0002] The oil quality of transformer on-load tap-changers deteriorates over time, eventually failing to meet safe operating requirements. Rapid oil degradation during a maintenance or testing cycle can severely impact power supply safety. Different types of tap-changer failures, in particular, generate pollutants that harm the oil to varying degrees, leading to varying rates of oil degradation and potentially disparate consequences.

[0003] Over the long term, the quality of the insulating oil in transformer on-load tapchangers deteriorates, seriously impacting operational safety. Furthermore, routine oil testing and removal consumes the oil within the transformer. When the oil level drops below the permitted minimum, a low oil level alarm is triggered, reducing operational reliability. Currently, due to inadequate oil replenishment equipment or concerns about oil depletion, excessive oil is added. This increases the oil temperature and level under heavy loads, necessitating draining to prevent overflow.

[0004] Therefore, an online oil filtering and oil replenishing device for a pressure regulating switch of a pressure regulator is urgently needed to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide an online oil filtering and oil replenishing device for a transformer voltage regulating switch to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an online oil filtering and oil replenishing device for a transformer voltage regulating switch, comprising an online oil filtering component and an oil filling and draining component, which are both connected to the voltage regulating switch;

[0007] The online oil filter assembly includes a debris removal filter element and a water removal filter element. The external pipeline of the pressure regulating switch passes through the pressure regulating switch manual oil drain valve V1, the online oil supply flange SV1, the circulating oil replenisher, the manual ball valve F5, the oil pump, the debris removal filter element, the water removal filter element, the solenoid valve F2, the online oil supply flange SV2, and the pressure regulating switch manual oil inlet valve V2 in sequence to circulate the filtered oil to the oil chamber of the pressure regulating switch;

[0008] The oil filling and draining assembly includes an oil replenishing retainer connected to a circulating oil replenisher, and an oil level transmitter P2 of the oil replenishing retainer is installed on the oil line. The circulating oil replenisher includes a shell made of hard metal, and a flexibly deformable oil storage capsule is provided in the shell. The outer wall of the oil storage capsule and the inner wall of the shell form an oil storage chamber. The oil storage chamber is filled with oil and drained after detecting the internal oil pressure of the pressure regulating switch through the switch oil level transmitter P1.

[0009] As an optional solution of the online oil filtering and replenishing device for the transformer voltage regulating switch of the utility model, the oil storage capsule inside the circulating oil replenisher is a TPU film oil capsule.

[0010] As an optional solution of the online oil filtering and replenishing device for the transformer voltage regulating switch of the utility model, an exhaust valve F7 is installed on the shell of the circulating oil replenisher.

[0011] As an optional solution for the online oil filtering and oil replenishing device of the transformer voltage regulating switch described in the utility model, a capsule made of TPU film is also provided inside the oil replenishing retainer, and the exhaust valve F8 is connected to the outside of the oil replenishing retainer. A breather connected to the capsule is also provided outside the oil replenishing retainer.

[0012] As an optional solution for the online oil filtering and replenishing device of the transformer voltage regulating switch of the utility model, a solenoid valve F4 is installed on the connecting pipeline between the circulating oil replenisher and the oil replenishing retainer, and a manual ball valve F6 is installed on the connecting pipeline between the circulating oil replenisher and the oil pump.

[0013] As an optional solution of the online oil filtering and replenishing device for the transformer voltage regulating switch of the utility model, a solenoid valve F3 is installed on the connecting pipeline between the circulating oil replenisher and the water removal filter element.

[0014] As an optional solution for the online oil filtering and replenishing device of the transformer voltage regulating switch described in the utility model, wherein: the connecting pipeline of the online oil filtering assembly is respectively installed with a docking gate valve 1 and a docking gate valve 2 at the oil outlet and oil inlet ends of the voltage regulating switch. The docking gate valve 1 is located between the online oil replenishing flange SV1 and the switch oil level transmitter P1, and the docking gate valve 2 is located between the solenoid valve F2 and the online oil replenishing flange SV2.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The transformer voltage regulating switch online oil filter and oil replenishment device filters the oil online and replenishes the oil through the pressure difference.

[0017] 2. The transformer voltage regulating switch is equipped with an online oil filter and oil replenishment device, and a variable volume circulating oil replenisher design in the oil filter system, which realizes a new process of oil replenishment and oil discharge. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the utility model;

[0019] Figure 2 It is a partial diagram of the present utility model.

[0020] In the figure: 1. Pressure regulating switch; 2. Docking gate valve 1; 3. Oil pump; 4. De-impurity filter element; 5. Water removal filter element; 6. Docking gate valve 2; 7. Circulating oil replenisher; 701. Housing; 702. Oil storage capsule; 8. Oil replenishment retainer; 801. Capsule; 9. Respirator. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-Figure 2 The utility model provides a technical solution: an online oil filtering and oil replenishing device for a transformer voltage regulating switch, including an online oil filtering component and an oil filling and draining component, which are connected to the voltage regulating switch 1, meeting the functional requirements of online oil filtering, and also meeting the requirements of oil filling and draining for oil level control.

[0023] 1. Online oil filtration function:

[0024] The online oil filter assembly includes a debris removal filter element 4 and a water removal filter element 5. The filtered oil is circulated on the external pipeline of the pressure regulating switch 1 through the pressure regulating switch manual oil drain valve V1, the online oil replenishment flange SV1, the circulating oil replenisher 7, the manual ball valve F5, the oil pump 3, the debris removal filter element 4, the water removal filter element 5, the solenoid valve F2, the online oil replenishment flange SV2, and the pressure regulating switch manual oil inlet valve V2 to the oil chamber of the pressure regulating switch 1.

[0025] That is, the oil in the pressure regulating switch 1 is powered by the oil pump 3, and the flow rate can be controlled at 6L / min. The insulating oil in the pressure regulating switch 1 flows out from the manual oil drain valve V1 of the pressure regulating switch, and passes through the online oil replenishment flange SV1, the solenoid valve F1, the circulating oil replenisher 7, the manual ball valve F5, the oil pump 3, the impurity removal filter element 4, the water removal filter element 5, the solenoid valve F2, the online oil replenishment flange SV2, and the manual oil inlet valve V2 of the pressure regulating switch in sequence and returns to the oil chamber of the pressure regulating switch 1, completing the oil filtration process.

[0026] 2. Online oil replenishment function:

[0027] The online oil replenishment function of the present application is performed during the online oil filtering function.

[0028] When the oil level transmitter P1 detects that the oil level of the pressure regulating switch 1 drops to the low oil level, the oil replenishment process is started. The oil replenishment process is a timed replenishment and shutdown detection cycle that is carried out in different time periods. If the oil pressure is detected to meet the pressure requirement of the control oil level, the oil replenishment operation is stopped.

[0029] The oil filling and draining assembly includes an oil replenishing retainer 8 connected to a circulating oil replenisher 7, and an oil level transmitter P2 of the oil replenishing retainer is installed on the oil line. The circulating oil replenisher 7 includes a shell 701 made of hard metal, and a flexibly deformable oil storage capsule 702 is arranged in the shell 701. The oil storage capsule 702 inside the circulating oil replenisher 7 is a TPU film oil capsule, and the outer wall of the oil storage capsule 702 and the inner wall of the shell 701 form an oil storage chamber. The oil storage chamber is filled with oil and drained after detecting the internal oil pressure of the pressure regulating switch 1 through the switch oil level transmitter P1.

[0030] It should be noted that the core principle of this application's online oil replenishment system is to provide an oil storage chamber within the device, specifically the space between the inner shell of the circulating oil replenisher 7 and the outer wall of the internal oil storage capsule 702. When the oil storage capsule 702 deforms and squeezes the outer shell 701, the deformation is negligible, as the outer shell 701 is made of a hard metal such as stainless steel. Similarly, the inner portion of the oil replenishment retainer 8 also houses a capsule 801 made of TPU film.

[0031] During use, the oil storage capsule 702 is filled with oil, the solenoid valve F4 is closed, the oil pressure inside and outside the oil storage capsule 702 is balanced, and the volume of the oil storage capsule 702 does not change, so the amount of oil contained between the inner wall of the circulating oil replenisher 7 and the outer wall of the internal oil storage capsule 702 does not change. When the switch needs to be replenished with oil, the solenoid valve F4 opens. Since the oil level in the oil replenishment retainer 8 is greater than the oil pressure of the oil in the oil storage capsule 702, the oil flows from the oil replenishment retainer 8 into the internal oil storage capsule 702 of the circulating oil replenisher 7, the volume of the oil storage capsule 702 increases, and the space between the inner wall of the circulating oil replenisher 7 and the outer wall of the internal oil storage capsule 702 becomes smaller. The oil discharged from the oil storage chamber enters the interior of the pressure regulating switch 1, causing the oil level in the switch to rise, completing the oil replenishment.

[0032] 3. The principle of online oil replenishment in this application:

[0033] When the circulating oil replenisher 7 is at rest, solenoid valves F1 and F4 are closed. The pressure detected by the oil level transmitter P1 is the oil pressure differential between the oil level in the pressure regulating switch 1 and the point at which it is located. This pressure ranges from 0.03MPa to 0.05MPa depending on the switch structure. The pressure detected by the oil level transmitter P2 is the oil pressure differential between the oil level in the oil replenisher's internal capsule and the point at which it is located. The height difference is only 0.5 meters, so the oil pressure of the oil level transmitter P2 is 0.005MPa. Therefore, when solenoid valves F1 and F4 are opened, a pressure differential exists between the inside and outside of the circulating oil replenisher's capsule, squeezing and shrinking the oil storage capsule 702. The oil in the oil storage capsule 702 is then discharged into the capsule 801 inside the oil replenisher 8, effectively draining the oil but not replenishing it.

[0034] When the switch oil level transmitter P1 detects that the oil level of the pressure regulating switch 1 drops to the low oil level oil pressure, the oil replenishment process is started.

[0035] During oil replenishment, the oil in the pressure regulating switch 1 is powered by the oil pump 3, and the flow rate can be controlled at 6L / min. The insulating oil in the pressure regulating switch 1 flows out from the manual oil drain valve V1 of the pressure regulating switch, and then passes through the online oil replenishment flange SV1, the solenoid valve F1, the circulating oil replenisher 7, the manual ball valve F5, the oil pump 3, the impurity removal filter element 4, the water removal filter element 5, the solenoid valve F2, the online oil replenishment flange SV2, and the manual oil inlet valve V2 of the pressure regulating switch back to the oil chamber of the pressure regulating switch 1. During the startup of the oil pump 3,

[0036] Since the inlet pressure of the oil pump 3 will drop to -0.08MPa, the oil inlet and outlet pipes of the circulating oil replenisher 7 have different diameters, with the inlet pipe being thin and the outlet pipe being thick, and the internal pressure will be controlled and maintained at around -0.05MPa. During the oil replenishment process, when the oil pump 3 is started, the solenoid valve F4 will intermittently open. Since the inner cavity of the capsule inside the oil replenishment retainer is connected to the atmosphere through the breather 9, the oil level inside the oil replenishment retainer 8 is at normal pressure. At this time, the oil pressure difference between the oil level of the oil replenishment retainer 8 and the bottom of the oil level inside the oil storage capsule 702 in the circulating oil replenisher 7 is greater than 0.05MPa. The oil in the oil replenishment retainer 8 will flow into the oil storage capsule 702 in the circulating oil replenisher 7 through the solenoid valve F4. The volume of the oil storage capsule 702 increases, causing the volume of the oil storage chamber in the circulating oil replenisher to decrease. The excess oil will increase the oil in the pressure regulating switch 1. When the switch oil level transmitter P1 detects that the oil level of the pressure regulating switch 1 has reached the controlled height, the oil replenishment process ends.

[0037] When the oil level transmitter P1 detects that the oil level in pressure regulating switch 1 has reached the high oil pressure level, it only needs to open solenoid valves F1 and F4. At this point, the internal pressure of circulating oil replenisher 7 is the pressure difference between the oil level in pressure regulating switch 1 and the oil pressure at that point, which ranges from 0.03MPa to 0.05MPa depending on the switch structure. The internal oil pressure of oil storage capsule 702 in circulating oil replenisher 7 is only approximately 0.01MPa. Therefore, the oil in pressure regulating switch 1 will flow out of the pressure regulating switch's manual oil drain valve V1, through the online oil replenishment flange SV1, solenoid valve F1, and circulating oil replenisher 7. The oil storage capsule 702 in circulating oil replenisher 7 is compressed, and the oil inside flows through solenoid valve F4 into oil replenishment retainer 8. The internal capsule 801 of oil replenishment retainer 8 is compressed, and the air inside is discharged through breather 9. When the oil level transmitter P1 detects that the oil level in pressure regulating switch 1 has reached the controlled height, the oil draining process ends.

[0038] In this embodiment, an exhaust valve F7 is installed on the housing 701 of the circulating oil replenisher 7, and the outside of the oil replenishment retainer 8 is connected to the exhaust valve F8, respectively for exhausting.

[0039] Furthermore, docking gate valve 1 2 and docking gate valve 2 6 are installed on the connecting pipeline of the online oil filter assembly at the oil outlet and oil inlet ends of the pressure regulating switch 1 respectively. Docking gate valve 1 2 is located between the online oil supply flange SV1 and the switch oil level transmitter P1, and docking gate valve 2 6 is located between the solenoid valve F2 and the online oil supply flange SV2, which is used to open and close the control oil circuit.

[0040] 4. Refueling function of circulating oil replenisher 7:

[0041] The amount of oil in the oil replenishment retainer 8 and the amount of oil in the oil storage capsule 702 of the circulating oil replenisher 7 are interchangeable in volume. Therefore, the amount of oil in the oil replenishment retainer 8 can be considered the amount of oil that the device can replenish to the pressure regulating switch 1. When the oil level transmitter P2 of the oil replenishment retainer detects that the oil level in the oil replenishment retainer 8 has reached a low level, it means that the device is out of oil and needs to be replenished by refilling the circulating oil replenisher 7.

[0042] When refueling the oil recirculating replenisher 7, solenoid valves F1 and F2 are closed, while solenoid valve F3, manual ball valve F5, and oil pump 3 are opened, allowing internal circulation. When oil pump 3 starts, the inlet pressure at oil pump 3 drops to -0.08 MPa, and the outlet pressure at oil pump 3 reaches 0.05 MPa. Pressures vary at the inlet and outlet of the impurity filter 4, the inlet and outlet of the water removal filter 5, the inlet and outlet of solenoid valve F3, the inlet and outlet of the oil recirculating replenisher 7, and the inlet and outlet of the manual ball valve F5. Manual ball valve F6 is located near the inlet of oil pump 3. Therefore, when manual ball valve F6 is opened, the oil pressure difference between the inlet and outlet of manual ball valve F6 is generated. If a normal pressure oil drum is connected to the inlet, the oil in the drum can be drawn into the inlet of oil pump 3. At the same time, solenoid valve F4 must be opened. If oil is drawn through manual ball valve F6, the drawn oil will be collected in the oil recirculating replenisher 7. The increase in oil in the circulating oil replenisher 7 will squeeze the oil storage capsule 702 inside it, causing the oil inside the oil storage capsule to enter the oil replenishment retainer 8 through the solenoid valve F4. Since the oil replenishment retainer 8 also has a capsule structure, the increase in oil will squeeze its own capsule 801, causing the gas inside the capsule 801 to be discharged through the respirator 9, completing the volume exchange.

[0043] When the oil storage capsule 702 inside the circulating oil replenisher 7 is squeezed and its volume cannot change, the internal oil pressure will increase sharply, triggering a pressure alarm to shut down the machine and deeming the refueling complete. At this time, the amount of oil in the oil replenishment retainer 8 can be considered as the amount of oil that the device can replenish to the pressure regulating switch 1.

[0044] It should be noted that this application detects and counts the amount of oil inside the oil replenishing retainer 8 based on the oil level transmitter P2 of the oil replenishing retainer. The amount of oil in the oil replenishing retainer 8 determines the amount of oil that can be replenished to the pressure regulating switch 1.

[0045] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online oil filter and oil replenishing device for a transformer voltage regulator, characterized in that: It includes an online oil filter assembly and an oil filling and draining assembly, which are connected to a pressure regulating switch (1); An online oil filter assembly comprises a debris removal filter element (4) and a water removal filter element (5), wherein the oil is circulated from the external pipeline of the pressure regulating switch (1) through the pressure regulating switch manual oil drain valve V1, the online oil replenishment flange SV1, the circulating oil replenisher (7), the manual ball valve F5, the oil pump (3), the debris removal filter element (4), the water removal filter element (5), the solenoid valve F2, the online oil replenishment flange SV2, and the pressure regulating switch manual oil inlet valve V2 to the oil chamber of the pressure regulating switch (1); The oil filling and draining assembly comprises an oil replenishing retainer (8) connected to a circulating oil replenisher (7), and an oil level transmitter P2 of the oil replenishing retainer is installed on the oil line. The circulating oil replenisher (7) comprises a shell (701) made of hard metal, a flexibly deformable oil storage capsule (702) is arranged in the shell (701), and the outer wall of the oil storage capsule (702) and the inner wall of the shell (701) form an oil storage chamber. The oil storage chamber is filled with oil and drained after the internal oil pressure of the pressure regulating switch (1) is detected by the switch oil level transmitter P1.

2. The online oil filtering and oil replenishing device for a transformer voltage regulating switch according to claim 1 is characterized in that: The oil storage capsule (702) inside the circulating oil replenisher (7) is a TPU film oil capsule.

3. The online oil filtering and oil replenishing device for a transformer voltage regulating switch according to claim 2 is characterized in that: An exhaust valve F7 is installed on the housing (701) of the circulating oil replenisher (7).

4. The online oil filtering and oil replenishing device for a transformer voltage regulating switch according to claim 3 is characterized in that: The oil replenishing retainer (8) is also provided with a capsule (801) made of a TPU film inside, and is connected to an exhaust valve F8 outside the oil replenishing retainer (8). A respirator (9) connected to the capsule (801) is also provided outside the oil replenishing retainer (8).

5. The online oil filtering and replenishing device for a transformer voltage regulating switch according to claim 4, characterized in that: A solenoid valve F4 is installed on the communication line between the circulating oil replenisher (7) and the oil replenishment retainer (8), and a manual ball valve F6 is installed on the communication line between the circulating oil replenisher (7) and the oil pump (3).

6. The online oil filtering and oil replenishing device for a transformer voltage regulating switch according to claim 1, characterized in that: A solenoid valve F3 is installed on the communication pipeline between the circulating oil replenisher (7) and the water removal filter element (5).

7. The online oil filtering and replenishing device for a transformer voltage regulating switch according to claim 1, characterized in that: The connecting pipeline of the online oil filter assembly is provided with a docking gate valve 1 (2) and a docking gate valve 2 (6) at the oil outlet and oil inlet ends of the pressure regulating switch (1), respectively. The docking gate valve 1 (2) is located between the online oil supply flange SV1 and the switch oil level transmitter P1, and the docking gate valve 2 (6) is located between the solenoid valve F2 and the online oil supply flange SV2.

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