Gas protection device of pipe network oil-immersed transformer

Abstract

The utility model discloses a gas protection device of a pipe network oil-immersed transformer, which is characterized in that a gas tank is arranged on a top cover of a shell of the oil-immersed transformer, and an oil injection and gas collection port, a gas measurement port, an oil level measurement port and a high-voltage tap switch are further arranged on the top cover; the gas protection device comprises a pressure sensor arranged at the gas measuring port, a pressure sensor probe connected with the bottom of the pressure sensor extends and is soaked into insulating oil in an inner cavity of an oil-immersed transformer shell, and the pressure sensor converts a changed pressure signal into an electric signal and transmits the electric signal to a control instrument. The device overcomes the defects of the original relay, and has better real-time observation and fault analysis capabilities.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, in particular to a gas protection device for a pipe network oil-immersed transformer. Background Art

[0002] Oil-immersed transformers in pipeline networks are often equipped with conventional gas relays. The relay contacts can only be used to detect transformer failure after the oil transformer fails and the output is sent to the external circuit. At this time, power outages often occur. It is then necessary to check whether it is caused by a fault in the relay itself or a secondary wiring fault from the contact to the external circuit, or a real internal short circuit in the transformer. The troubleshooting process is complicated and difficult.

[0003] Moreover, the oil transformer of the pipeline network is usually installed in an extremely narrow tunnel, and the relay is installed on the casing of the oil transformer. If it encounters mud or falling rocks, it is easy to be damaged. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a gas protection device for a pipe network oil-immersed transformer, which overcomes the shortcomings of the original relay and has better real-time observation and fault analysis capabilities.

[0005] The utility model is realized by the following technical solutions:

[0006] A gas protection device for a pipe network oil-immersed transformer, wherein a gas box is arranged on the top cover of the oil-immersed transformer housing, and an oil filling and gas collection port, a gas measuring port, an oil level measuring port, and a high-voltage tap switch are also arranged on the top cover;

[0007] The gas protection device includes a pressure sensor arranged at the gas measuring port, and the pressure sensor probe connected to the bottom of the pressure sensor extends and is immersed in the insulating oil in the inner cavity of the oil-immersed transformer shell. The pressure sensor converts the changing pressure signal into an electrical signal and transmits it to the control instrument.

[0008] Furthermore, the outer sleeve of the pressure sensor is provided with a sensor protection cover, and the sensor protection cover is detachably connected to the top cover of the oil-immersed transformer shell through bolts.

[0009] Furthermore, the sensor protection cover is made of Q235 metal material, and welding bolt holes are reserved on the top cover of the oil-immersed transformer housing.

[0010] Furthermore, the oil-immersed transformer housing is assembled by welding 5MM thick steel plates.

[0011] Furthermore, a temperature measuring pipe opening is also arranged on the top cover of the oil-immersed transformer housing.

[0012] Furthermore, high voltage incoming line terminals and low voltage outgoing line terminals are respectively provided at two ends of the top cover of the oil-immersed transformer housing.

[0013] Furthermore, the high-voltage incoming line terminal adopts a fully sealed elbow-type connector to connect the high-voltage cable.

[0014] Furthermore, the oil-immersed transformer housing is provided with a digital interface.

[0015] Furthermore, the oil-immersed transformer housing is connected with a heat dissipation oil pipe.

[0016] Furthermore, a shell grounding is provided at the bottom of the oil-immersed transformer shell.

[0017] The beneficial effects of the utility model are:

[0018] (1) The oil-immersed transformer shell of the utility model is welded and assembled with 5MM thick steel plate material, and has the advantages of very good pressure resistance, mechanical strength, air tightness, etc., and is suitable for use in shield tunnel environments. The high-voltage incoming line terminal is externally connected to the high-voltage cable, and the fully sealed elbow joint avoids the leakage of live parts. The oil-immersed transformer shell is also provided with oil filling and gas collection ports, gas measurement ports, oil level measurement ports, temperature measurement pipe ports, etc. The layout and structure of the oil-transformer oil tank are reasonable to achieve the function of real-time monitoring;

[0019] (2) The pressure sensor is used to measure the internal pressure of the oil tank. It has a wide range of applications and can be applied to transformers of various capacity levels. It can also reduce mold investment during the product development period. The sensor has been used for many years with stable quality. The unified layout can greatly reduce costs during mass production. It can also record the internal operating data of the oil transformer and transmit it remotely to the background. It has a wide range of applications and can be used in important power grid systems. A metal protective net or other sensor protection cover is added around the sensor to prevent mechanical damage caused by falling rocks.

[0020] (3) This device reserves a digital interface for future products in the oil-immersed transformer housing, which is suitable for installing various background systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a partial cross-sectional view of the utility model;

[0023] Figure 3 This is a schematic diagram of the installation of the pressure sensor of the utility model;

[0024] Figure 4 This is a schematic diagram of the installation of the sensor protection cover of the utility model;

[0025] Figure 5The schematic diagram of the utility model for converting into an electrical signal;

[0026] Figure 6 It is a schematic diagram of the instrument of the utility model;

[0027] Figure numerals: 1. Oil-immersed transformer housing; 2. High-voltage incoming terminal; 3. Heat dissipation oil pipe; 4. Low-voltage outgoing terminal; 5. Temperature measuring pipe port; 6. Oil level measuring port; 7. High-voltage tap changer; 8. Gas measuring port; 9. Oil filling and gas collection port; 10. Gas box; 11. Shell grounding; 12. Pressure sensor; 13. Pressure sensor probe; 14. Insulating oil; 15. Sensor protection cover, 16. Bolt; 17. PV display window, 18. SV display window, 19. Confirm key, 20. Shift key, 21. Decrease key, 22. Increase key, 23. Alarm indicator light. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0029] As shown in the figure, a gas protection device for a pipe network oil-immersed transformer is provided with a gas box 10 on the top cover of the oil-immersed transformer housing 1, and an oil filling and gas collection port 9, a gas measuring port 8, an oil level measuring port 6, a high-voltage tap switch 7, a temperature measuring port 5, and a heat dissipation oil pipe 3 are also provided on the top cover. The layout and structure of the oil tank of the oil transformer are reasonable to achieve the function of real-time monitoring;

[0030] The gas protection device includes a pressure sensor 12 arranged at the gas measuring port 8, the height of the sensor is not more than 100MM, which is suitable for the layout of the oil-transformer size of the pipeline network, and can replace various types of gas relays currently available. The pressure sensor probe 13 connected to the bottom of the pressure sensor 12 extends and is immersed in the insulating oil 14 in the inner cavity of the oil-immersed transformer shell. The pressure sensitive element at the bottom reacts to the internal pressure change, and the changed pressure signal is converted into an electrical signal and transmitted to the corresponding display instrument. The instrument sets a suitable ratio according to the corresponding relationship and displays the corresponding pressure value.

[0031] The control instrument is provided with a PV display window 17, an SV display window 18, various alarm indicator lights 23, a confirmation key 19, a shift key 20, a decrease key 21, and an increase key 22. The parameters on the control instrument are as follows:

[0032]

[0033] Furthermore, the pressure sensor 12 is provided with a sensor protection cover 15 on its exterior to prevent mechanical damage caused by falling rocks; the sensor protection cover 15 is detachably connected to the top cover of the oil-immersed transformer housing via bolts 16. The sensor protection cover 15 is made of Q235 metal, and welding bolt holes are reserved on the top cover of the oil-immersed transformer housing.

[0034] Furthermore, the oil-immersed transformer housing 1 is welded and assembled with 5MM thick steel plate material, and has the advantages of very good pressure resistance, mechanical strength, air tightness, etc., and is suitable for use in shield tunnel environments. High-voltage incoming line terminals 2 and low-voltage outgoing line terminals 4 are respectively provided at both ends of the top cover of the oil-immersed transformer housing 1. The high-voltage incoming line terminal 2 adopts a fully sealed elbow-type connector to connect the high-voltage cable to avoid the bare leakage of the live part.

[0035] Furthermore, the oil-immersed transformer housing 1 is provided with a digital interface, which is suitable for installing various backend systems.

[0036] Furthermore, a casing grounding 11 is provided at the bottom of the oil-immersed transformer casing 1 to prevent the casing of the electrical equipment from being charged.

[0037] In summary, the real-time monitoring method of oil transformer pressure proposed in this patent can be applied to 200kVA~4000kVA oil transformers by setting different alarm values ​​through the controller. The product has a high degree of standardization and can greatly save the mold investment cost in product research and development.

[0038] The basic principles, main features and advantages of the utility model are shown and described above. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which shall fall within the scope of the utility model to be protected. The scope of protection of the utility model shall be defined by the attached claims and their equivalents.

Claims

1. A gas protection device for oil-immersed transformers in pipe networks, Features: An air box (10) is arranged on the top cover of an oil-immersed transformer housing (1), and an oil filling and gas collection port (9), a gas measuring port (8), an oil level measuring port (6), and a high-voltage tap switch (7) are also arranged on the top cover; The gas protection device comprises a pressure sensor (12) arranged at a gas measuring port (8); a pressure sensor probe (13) connected to the bottom of the pressure sensor (12) extends and is immersed in insulating oil (14) in the inner cavity of the oil-immersed transformer shell; and the pressure sensor (12) converts a changing pressure signal into an electrical signal and transmits it to a control instrument.

2. A gas protection device for a pipeline oil-immersed transformer according to claim 1, Features: The pressure sensor (12) is externally sleeved with a sensor protection cover (15), and the sensor protection cover (15) is detachably connected to a top cover of an oil-immersed transformer housing via bolts (16).

3. A gas protection device for a pipeline oil-immersed transformer according to claim 2, Features: The sensor protection cover (15) is made of Q235 metal material, and welding bolt holes are reserved on the top cover of the oil-immersed transformer housing.

4. A gas protection device for a pipeline oil-immersed transformer according to claim 1, Features: The oil-immersed transformer housing (1) is assembled by welding 5 mm thick steel plates.

5. A gas protection device for a pipeline oil-immersed transformer according to claim 1, Features: A temperature measuring pipe opening (5) is also provided on the top cover of the oil-immersed transformer housing (1).

6. A gas protection device for a pipeline oil-immersed transformer according to claim 1, Features: High-voltage incoming line terminals (2) and low-voltage outgoing line terminals (4) are respectively arranged at two ends of a top cover of an oil-immersed transformer housing (1).

7. A gas protection device for a pipeline oil-immersed transformer according to claim 6, Features: The high-voltage incoming line terminal (2) adopts a fully sealed elbow-type connector to be externally connected to a high-voltage cable.

8. A gas protection device for a pipeline oil-immersed transformer according to claim 1, Features: The oil-immersed transformer housing (1) is provided with a digital interface.

9. A gas protection device for a pipeline oil-immersed transformer according to claim 1, Features: The oil-immersed transformer housing (1) is connected to a heat dissipation oil pipe (3).

10. A gas protection device for a pipeline oil-immersed transformer according to claim 1, Features: A casing grounding (11) is provided at the bottom of the oil-immersed transformer casing (1).

Images