A drainage sampling device for taking oil samples from an oil-immersed current or voltage transformer.
By designing a current sampling device using an oil-immersed current or voltage transformer, the safety hazards of high-altitude operations and live oil sampling in traditional oil sampling processes have been solved, enabling safe, low-altitude oil sampling operations, reducing labor intensity and improving efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HOTAN JINGHE ELECTRICAL EQUIPMENT CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-06-30
AI Technical Summary
In the process of taking oil samples using traditional oil-immersed current or voltage transformers, operators need to work at heights and there are safety hazards due to the energized oil sampling process. It is also labor-intensive and inefficient.
Design a sampling device for oil sampling from an oil-immersed current or voltage transformer, including an oil tank, an oil outlet, a drain pipe, an oil sampling control box, and a needle-type oil sampling valve. A safe and low-altitude oil sampling process is achieved through threaded connection and handle operation.
This avoids working at heights and extracting oil while the circuit is electrified, reducing labor intensity, improving work efficiency, and ensuring operational safety.
Smart Images
Figure CN224435859U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a drainage and sampling device for taking oil samples, and in particular, a drainage and sampling device for taking oil samples from an oil-immersed current or voltage transformer. Background Technology
[0002] With the development of the social economy and the improvement of renewable energy power generation technology, various testing methods for power operation equipment have diversified. However, traditional oil sampling equipment has not been upgraded or improved in terms of user-friendliness. When these oil-immersed power equipment are in operation, the requirements for the gas and moisture content in the oil are high. The operating condition of the equipment can be judged based on the various media in the oil, which is the only standard for judging the safe operation of the equipment. According to the instructions and standards of the State Grid Corporation of China, such as transformers, on-load tap changers, and voltage transformers, periodic sampling and testing should be carried out as required to ensure the safe and reliable operation of the main equipment.
[0003] Traditional transformer manufacturers need to sample and monitor the oil inside current transformers and voltage transformers during product manufacturing and operation. This is to obtain oil sample data and analyze product failure types during testing and customer use. Currently, in the industry, the upper oil sampling valves generally do not adopt a downward-leading structure. The current transformers or voltage transformers are relatively high, requiring operators to climb up using insulated ladders. Climbing up nearly 5 meters of insulated material is dangerous, and sampling oil while it is energized poses a risk of accidents to operators. Utility Model Content
[0004] The purpose of this utility model is to provide a sampling device for taking oil samples from an oil-immersed current or voltage transformer. Its structure is reasonable, which can avoid the danger of workers working at height, avoid oil sampling while the circuit is electrified, reduce labor intensity, and improve work efficiency.
[0005] The purpose of this utility model is achieved as follows: A sampling device for oil sampling from an oil-immersed current or voltage transformer includes an oil storage tank for the current or voltage transformer installed on the top of a support in a substation. An oil sampling port is located at the lower part of the oil storage tank. The oil sampling port is connected to a drainage pipe via an oil sampling valve. The drainage pipe extends downwards along the support and connects to an oil inlet pipe housing an oil sampling control box. The oil inlet pipe, located inside the oil sampling control box, is connected to a quick oil sampling port via a main valve. The oil sampling valve is structured as follows: a valve core tube is installed within the inner cavity of a cylindrical valve body through a second and third sealing ring. An externally threaded pipe with a baffle plate at the bottom is installed on the valve core tube located at the upper part of the valve body. The externally threaded pipe is connected to the oil outlet pipe of the oil sampling port. An oil outlet is installed in the pipe hole of the valve core tube. The push rod has an upper part with a diameter smaller than that of the valve core tube hole, forming an oil inlet chamber. An annular groove is provided in the middle of the outer wall of the valve core tube, and the annular groove is connected to the oil inlet chamber through an oil passage. An oil outlet pipe is provided in the middle of the valve body and is connected to the annular groove of the valve core tube. The oil outlet push rod located at the lower part of the oil inlet chamber is engaged with the valve core tube hole through a fourth sealing ring. The oil outlet push rod extending from the lower part of the valve body is connected to a threaded sleeve with internal and external threads. The threaded sleeve is fitted with a nut cap through the external thread. A handle is provided at the lower end of the oil outlet push rod extending out of the nut cap. The structure of the oil outlet is that a spring-controlled steel ball is installed in the oil inlet passage provided on the interface seat. The steel ball is engaged with the outlet seat of the oil inlet passage. An oil outlet interface pipe with internal threads is provided at the outer end of the outlet seat.
[0006] The oil extraction valve of this invention is a pin-type connector with a handle threaded onto it. Rotating the handle extends the oil ejector rod, which pushes against the steel ball at the oil extraction port, allowing oil to flow down through the oil inlet chamber and oil passage into the oil extraction control box. The oil extraction valve is 360° rotatable, ensuring that it can be rotated in any direction to the desired location.
[0007] The oil extraction control box is tied to the steel pipe of the support frame.
[0008] The drain pipe is connected to the oil inlet pipe of the oil extraction control box, which is connected to the oil outlet via a main valve, allowing oil to be extracted. This invention is suitable for voltage transformers. It avoids high-level oil extraction and energized oil extraction, eliminating construction risks.
[0009] The oil sampling valve is normally open. When taking an oil sample, the sampled oil flows out from the quick oil sampling port by manually opening it.
[0010] This utility model has a reasonable structure, avoids the dangers of workers working at heights, avoids oil extraction while the circuit is electrified, reduces labor intensity, and improves work efficiency. Attached Figure Description
[0011] The present invention will now be further described with reference to the accompanying drawings.Figure 1 This is a schematic diagram of the structure of this utility model. Figure 2 A schematic diagram showing the structure for opening the door of the oil extraction control box. Figure 3 for Figure 2 A rear-view stereoscopic structural diagram. Figure 4 This is a side view of the oil intake port. Figure 5 for Figure 4 A schematic diagram of the AA cross-sectional structure. Figure 6 This is a schematic diagram of the main structure of the oil tapping valve. Figure 7 for Figure 6 Schematic diagram of the BB cross-section structure. Figure 8 A cross-sectional view of the structure for mounting an oil extraction valve on the oil extraction port. Detailed Implementation
[0012] A current sampling device for taking oil samples from an oil-immersed current or voltage transformer, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8As shown, the oil storage tank 1 includes a current or voltage transformer mounted on the top of a support frame in a substation. An oil outlet 2 is located at the lower part of the oil storage tank 1. The oil outlet 2 is connected to a drain pipe 3 via an oil outlet valve 7. The drain pipe 3 extends downwards along the support frame and connects to an oil inlet pipe 5 housing an oil outlet control box 4. The oil inlet pipe 5, located inside the oil outlet control box 4, is connected to a quick oil outlet 28 via a main valve 6. The oil outlet valve 7 has a structure in which a valve core tube 21 is installed within the inner cavity of a cylindrical valve body 18, fitted with a second sealing ring 19 and a third sealing ring 20. An externally threaded pipe with a baffle plate is mounted on the valve core tube 21 located at the upper part of the valve body 18. This externally threaded pipe connects to the oil outlet interface pipe 17 of the oil outlet 2. An oil outlet rod 12 is installed in the pipe hole of the valve core tube 21, with the diameter of the upper half of the rod smaller than the diameter of the pipe hole of the valve core tube 21. The diameter forms the oil inlet chamber. An annular groove is provided in the middle of the outer wall of the valve core tube 21. The annular groove is connected to the oil inlet chamber through the oil passage 22. The oil outlet pipe 11 provided in the middle of the valve body 18 is connected to the annular groove of the valve core tube 21. The oil outlet rod 12 located at the lower part of the oil inlet chamber is engaged with the valve core tube hole through the fourth sealing ring 23. The oil outlet rod 12 extending from the lower part of the valve body 18 is connected to a threaded sleeve 24 with internal and external threads. The threaded sleeve 24 is connected to a nut cap 25 through the external thread. A handle 26 is provided at the lower end of the oil outlet rod 12 extending from the nut cap 25. The structure of the oil outlet 2 is that a steel ball 16 controlled by a spring 15 is installed in the oil inlet passage 14 provided on the interface seat 13. The steel ball 16 is engaged with the outlet seat of the oil inlet passage 14. An oil outlet interface pipe 17 with internal threads is provided at the outer end of the outlet seat. The installation height of the oil control box 4 is 1.4-1.6 meters above the ground. A door 8 is hinged to the opening of the oil extraction control box 4. Two sets of symmetrical connecting bolts 9 are located on the back of the oil extraction control box 4. Each set of two connecting bolts 9 secures the oil extraction control box 4 to the steel pipe of the support frame via mating clamps 10 and nuts. A first sealing ring 27 is installed on the baffle plate via a sealing ring groove, sealing the end face of the oil outlet pipe 17 of the oil extraction port 2 with the baffle plate. An external hexagonal flange is provided around the baffle plate. The oil storage tank 1 is a corrugated oil storage tank. The oil extraction port 2 is connected to the drain pipe 3 via the oil outlet pipe 11 of the oil extraction valve 7, which has a check valve.
Claims
1. A current sampling device for taking oil samples from an oil-immersed current or voltage transformer, comprising an oil storage tank (1) for the current or voltage transformer installed on the top of a support in a substation, characterized in that: An oil outlet (2) is provided at the lower part of the oil tank (1). The oil outlet (2) is connected to the drain pipe (3) through the oil outlet valve (7). The drain pipe (3) is connected to the oil inlet pipe (5) of the oil outlet control box (4) located downward along the support. The oil inlet pipe (5) located in the oil outlet control box (4) is connected to the quick oil outlet (28) through the main valve (6). The structure of the oil outlet valve (7) is that a second sealing ring is used in the inner cavity of the cylindrical valve body (18). (19) The third sealing ring (20) is fitted with the valve core tube (21). The valve core tube (21) located on the upper part of the valve body (18) is provided with an external threaded tube with a baffle at the bottom. The external threaded tube is connected to the oil outlet pipe (17) of the oil inlet (2). An oil outlet rod (12) is fitted in the pipe hole of the valve core tube (21). The diameter of the upper half of the oil outlet rod (12) is smaller than the diameter of the pipe hole of the valve core tube (21) to form an oil inlet chamber. 21) An annular groove is provided in the middle of the outer wall. The annular groove is connected to the oil inlet chamber through the oil passage (22). The oil outlet pipe (11) provided in the middle of the valve body (18) is connected to the annular groove of the valve core tube (21). The oil outlet push rod (12) located at the lower part of the oil inlet chamber is engaged with the valve core tube hole through the fourth sealing ring (23). The oil outlet push rod (12) extending from the lower part of the valve body (18) is connected to a threaded sleeve (24) with internal and external threads through a threaded connection. The nut top cover (25) is installed on the nut top cover (25) through the external thread of the nut top cover (25). A handle (26) is provided at the lower end of the oil outlet rod (12) that extends out of the nut top cover (25). The structure of the oil outlet (2) is that a steel ball (16) controlled by a spring (15) is installed in the oil inlet channel (14) provided on the interface seat (13). The steel ball (16) cooperates with the outlet seat of the oil inlet channel (14). An oil outlet interface pipe (17) with internal threads is provided at the outer end of the outlet seat.
2. The oil sampling device for taking oil samples from an oil-immersed current or voltage transformer according to claim 1, characterized in that: The installation height of the oil extraction control box (4) is 1.4-1.6 meters from the bottom of the box to the ground.
3. The oil sampling device for taking oil samples from an oil-immersed current or voltage transformer according to claim 1, characterized in that: in The door (8) is hinged to the opening of the oil extraction control box (4). Two sets of symmetrical connecting bolts are set on the back of the oil extraction control box (4). The two connecting bolts (9) of each set are fixed to the steel pipe of the support by the clamp (10) and nut respectively.
4. The oil sampling device for taking oil samples from an oil-immersed current or voltage transformer according to claim 1, characterized in that: A first sealing ring (27) is installed on the baffle through a sealing ring groove, so that the end face of the oil outlet pipe (17) of the oil outlet (2) is sealed with the baffle. An outer hexagon is provided around the baffle.
5. The oil sampling device for taking oil samples from an oil-immersed current or voltage transformer according to claim 1, characterized in that: The oil tank (1) is a corrugated oil tank.
6. The oil sampling device for taking oil samples from an oil-immersed current or voltage transformer according to claim 1, characterized in that: The oil inlet (2) is connected to the drain pipe (3) through the oil outlet pipe (11) of the oil inlet valve (7) with a check valve.