Fully-sealed metal corrugated vertical switch oil conservator

Abstract

The utility model discloses a fully-sealed metal corrugated vertical switch oil conservator, which belongs to the technical field of transformer oil volume compensation and protection devices, and comprises a conservator body and a corrugated core body, the conservator body comprises a conservator body upper cover, and the corrugated core body comprises a corrugated pipe and a movable end plate. The lower end of the corrugated pipe is welded with the movable end plate, the upper end of the corrugated pipe is welded with the cabinet body upper cover, the inside of the corrugated core body and the cabinet body upper cover form a breathing cavity, the outside of the corrugated core body and the inside of the cabinet body form an oil storage cavity, an oil injection and drainage pipe is arranged on a cabinet body bottom plate, an oil level gauge is arranged on the side wall of the cabinet body, and a permanent magnet is arranged on the lower portion of the movable end plate. The oil level indicator and the permanent magnet generate magnetic coupling to indicate the oil level, the oil level indicator is connected with the control box, so that the oil level is accurate and reliable, the control box can remotely transmit, store and analyze oil level data, the oil quantity state of the oil conservator is monitored in real time, and abnormal problems such as high and low oil level alarm and false oil level are comprehensively judged according to the oil quantity and oil temperature change data.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer oil volume compensation and protection devices, in particular to a fully sealed metal corrugated vertical switch oil storage cabinet. Background Art

[0002] With the expansion of power grids and increasing demands for voltage quality, on-load tap-changer (OTC) transformers have become increasingly widely used. During on-load tap-changer operation, transformer oil extinguishes arcs and provides insulation during switching. Each switching operation can produce decomposition products and some free carbon, leading to oil degradation. The transformer oil in the OTTC tank is compensated by an open oil conservator, which fails to effectively isolate the oil from humid air, accelerating oil degradation. This oil degradation reduces the overall insulation level of the OTTC, limiting its switching frequency and service life. Furthermore, the oil level in the open oil conservator exhibits a nonlinear relationship with oil temperature. Float-type, rod-type pointer oil level gauges exhibit large indication errors, leading to oil level deviations during filling and the risk of oil level anomalies. These factors affect the effective operation of the OTTC and the safe operation of the transformer.

[0003] Therefore, manual monitoring is required. Operation and maintenance personnel need to frequently replace the silica gel in the desiccant and pay attention to changes in the oil level in the switch oil storage cabinet, which increases the workload and maintenance costs of daily maintenance personnel. Moreover, when an abnormal condition occurs in the oil storage cabinet, it is difficult to detect and respond in time through manual monitoring, which can easily cause huge losses. Utility Model Content

[0004] Aiming at the problems existing in the existing on-load tap-changer oil conservator, the utility model provides a fully sealed metal corrugated vertical switch oil conservator.

[0005] The specific technical solutions created by this utility model are as follows:

[0006] The utility model provides a fully sealed metal corrugated vertical switch oil storage cabinet. The device comprises: a cabinet body for accommodating transformer oil, a corrugated core body placed in the cabinet body for transformer oil compensation and sealing, the cabinet body comprising: a cabinet upper cover and cabinet side walls, the corrugated core body being placed inside the cabinet body, the corrugated core body comprising: a bellows and a movable end plate, the lower end of the bellows body being connected to the movable end plate, the upper end of the bellows body being connected to the cabinet upper cover, the corrugated core body and the interior of the cabinet upper cover forming a breathing cavity, the outside of the corrugated core body and the inside of the cabinet body forming a fully sealed oil storage cavity, the corrugated core body vertically extending and retracting in the oil storage cavity, an oil level gauge being arranged outside the cabinet body, and the oil level gauge being connected to a control box.

[0007] Preferably, an oil level gauge is provided on the side wall of the cabinet, a permanent magnet is provided at the lower part of the movable end plate, the oil level gauge is magnetically coupled with the permanent magnet, and the oil level gauge indicates the oil level when the movable end plate moves up and down.

[0008] Preferably, a magnetic resistance switch is provided inside the oil level gauge.

[0009] Preferably, a breathing tube is provided on the upper cover of the cabinet, and the breathing cavity is connected to the atmosphere through the breathing tube.

[0010] Preferably, the cabinet further comprises: a cabinet bottom plate, a cabinet top cover fixedly connected to the cabinet side wall, and the cabinet side wall fixedly connected to the cabinet bottom plate.

[0011] Preferably, a main connecting pipe is provided on the bottom plate of the cabinet, and the main connecting pipe is connected to the oil tank of the on-load tap-changer body.

[0012] Preferably, an exhaust pipe is provided on the side wall of the cabinet, the exhaust pipe is communicated with the oil storage chamber, and an exhaust valve is installed on the exhaust pipe.

[0013] Preferably, an oil filling and discharge pipe is further provided on the bottom plate of the cabinet, and the oil filling and discharge pipe is communicated with the oil storage cavity.

[0014] Preferably, an oil level data storage and analysis unit and a temperature sensor are provided in the control box.

[0015] Preferably, the control box is connected to the background computer via RS485 communication mode.

[0016] The beneficial effects of the present invention are that, compared with the prior art, the fully sealed metal corrugated vertical switch oil conservator has the following advantages:

[0017] 1. Solve the problem that the current open switch oil conservator cannot effectively isolate humid air and transformer oil is prone to deterioration. The insulating oil is completely isolated from the atmosphere, the oil conservator has no condensation, and no desiccant is required, achieving maintenance-free.

[0018] 2. During operation, the corrugated core of the metal corrugated vertical switch oil storage cabinet of the present invention expands and contracts vertically, and the effective compensation cross-sectional area remains unchanged. The transformer oil expands and contracts with temperature changes, and the corrugated core expands and contracts vertically, communicating with the atmosphere through an internal breathing tube for breathing, thereby compensating for volume changes of the transformer oil. The position of the movable end plate is the oil level position of the oil storage chamber. The movable end plate follows the vertical expansion and contraction of the corrugated core. The permanent magnet on the movable end plate generates magnetic coupling with the magnetic flap oil level gauge on the outside of the cabinet side wall, and the magnetic flap oil level gauge displays the oil level of the oil storage chamber. Because the effective compensation cross-sectional area remains unchanged when the corrugated core expands and contracts vertically, the oil level is linearly related to the oil temperature. The oil level gauge displays no errors, and the oil level is intuitive, clear, accurate, and reliable, reserving ample compensation capacity for high and low oil levels, reducing the impact of inaccurate installation and oil filling and temperature differences on the extreme oil level.

[0019] 3. This device uses the magnetic resistance switch set in the oil level gauge. The magnetic resistance switch continuously outputs a 4-20mA oil level data remote transmission signal, and then uses the oil level data analysis unit inside the control box to convert the signal, store and analyze the data. The temperature sensor inside the control box compares the impact of different ambient temperatures on the oil level to avoid oil level errors caused by thermal expansion and contraction. The control box combines the temperature sensor to comprehensively analyze and confirm the oil level. The control box then transmits the oil level data to the background computer through RS485 communication. Therefore, when the oil level of this device is abnormal, the oil level abnormality signal will be transmitted to the background computer, which has the function of early warning of oil level abnormality, so as to achieve timely monitoring and timely feedback to avoid losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a fully sealed metal corrugated vertical switch oil conservator.

[0021] Among them: 1 - cabinet cover, 2 - cabinet side wall, 3 - cabinet bottom plate, 4 - bellows, 5 - movable end plate, 6 - breathing chamber, 7 - breathing pipe, 8 - oil storage chamber, 9 - exhaust pipe, 10 - main connecting pipe, 11 - oil filling and discharge pipe, 12 - oil level gauge, 13 - permanent magnet, 14 - control box. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without making any creative efforts are all within the scope of protection of the present invention.

[0023] The utility model provides a fully sealed metal corrugated vertical switch oil storage cabinet, such as Figure 1 As shown, the device comprises: a cabinet for containing transformer oil, a corrugated core placed in the cabinet for transformer oil compensation and sealing;

[0024] The cabinet comprises: a cabinet cover 1, a cabinet side wall 2 and a cabinet bottom plate 3, a corrugated core is placed in the cabinet, the corrugated core comprises: a bellows 4 and a movable end plate 5, the lower end of the bellows 4 is fixedly connected to the upper side of the movable end plate 5, the upper end of the bellows 4 is fixedly connected to the lower side of the cabinet cover 1, the interior of the corrugated core and the cabinet cover 1 form a breathing cavity 6, a breathing tube 7 is provided on the upper part of the cabinet cover 1, and the breathing cavity 6 is communicated with the atmosphere through the breathing tube 7 provided on the cabinet cover 1; the corrugated core is placed in the cabinet, and the lower side of the cabinet cover 1 is fixedly connected to the The upper end of the cabinet side wall 2 is fixedly connected, the lower end of the cabinet side wall 2 and the upper side of the cabinet bottom plate 3 are fixedly connected, and the outside of the corrugated core and the inside of the cabinet form a fully sealed oil storage chamber 8; an exhaust pipe 9 is provided on the cabinet side wall 2 at the top of the oil storage chamber 8, and an exhaust valve is installed on the exhaust pipe 9. The exhaust pipe 9 and the oil storage chamber 8 are connected. A main connecting pipe 10 that is connected to the oil tank of the on-load tap changer body is provided on the cabinet bottom plate 3 at the bottom of the oil storage chamber 8. At the same time, an oil filling and discharge pipe 11 is also provided on the cabinet bottom plate 3, and the oil filling and discharge pipe 11 is connected to the oil storage chamber 8.

[0025] A magnetic flap oil level gauge 12 is provided on the outside of the cabinet side wall 2 and is completely isolated from the oil storage chamber 8. A permanent magnet 13 is provided at the lower end of the movable end plate 5 close to the oil level gauge 12. The magnetic flap oil level gauge 12 and the permanent magnet 13 can generate magnetic coupling. Therefore, when the movable end plate 5 moves up and down, the oil level gauge 12 will follow the permanent magnet 13 to indicate the oil level. At the same time, the oil level gauge 12 is connected to the control box 14 to transmit the oil level signal to the control box 14 for data storage and analysis. An oil level data storage and analysis unit and a temperature sensor are provided inside the control box. At the same time, a magnetic resistance switch is provided inside the magnetic flap oil level gauge 12.

[0026] In a specific embodiment, the magnetic flip-type oil level gauge 12 and the permanent magnet of the movable end plate 5 are magnetically coupled, so the oil level gauge will move with the movable end plate 5 and display the oil level in real time. A magnetic resistance switch is set inside the oil level gauge, and the magnetic resistance switch will continuously output a 4-20mA oil level data remote transmission signal to the oil level data analysis unit of the control box 14. The oil level data is converted into a signal, stored and analyzed by the bit data analysis unit in the control box 14. At the same time, the temperature sensor inside the control box 14 can record the ambient temperature, compare the oil level data with the temperature sensor in the control box 14, and then analyze the impact of temperature on the oil level to avoid oil level errors caused by thermal expansion and contraction. The oil level data is then transmitted to the background computer via RS485 communication. When the oil level data transmitted by the oil level gauge of the switch oil storage cabinet deviates significantly from the oil level corresponding to the on-site oil temperature curve, the control box 14 will also send an oil level abnormality signal to the background computer. This device has an early warning function for oil level abnormality, so as to achieve timely monitoring and timely feedback to avoid losses.

[0027] The bellows 4 is welded to the movable end plate 5 and the cabinet cover 1, and the cabinet sidewall 2 is welded to the cabinet cover 1 and the cabinet bottom plate 3. The cabinet sidewall 2 and the bellows 4 are circular in structure, i.e., the horizontal cross-section of the bellows and the cabinet sidewall is a circular structure.

[0028] Since the corrugated core of the metal corrugated vertical switch oil conservator and the cabinet cover 1 form a breathing chamber 6, the corrugated core is sealed and welded to the cabinet cover 1 as an upper hanging airbag and placed in the transformer oil. A fully sealed oil storage chamber 8 is formed between the outside of the corrugated core and the cabinet side wall 2 and the cabinet bottom plate 3, thereby achieving complete isolation and sealing of the transformer oil, isolating it from moist air, and preventing the transformer oil from deteriorating.

[0029] In a specific embodiment, when filling oil using the conventional method, oil is added to the oil reservoir 8 through the oil filling and discharge pipe 11 at the bottom of the oil reservoir 8. The exhaust valve on the exhaust pipe 9 is opened, and the air in the oil reservoir 8 is discharged through the exhaust pipe 9 at the top of the cabinet side wall 2. When filling oil using the vacuum method, when the corrugated core is extended, it is fixed to the cabinet bottom plate 3. The breathing pipe 7 is opened, and a vacuum is drawn through the exhaust port 9 at the top of the cabinet side wall 2. Then, oil is added to the oil reservoir 8 through the oil filling and discharge pipe 11 at the bottom of the oil reservoir 8.

[0030] During operation, during the oil filling process, the movable end plate 5 moves along with the rise of the oil level. The position of the movable end plate 5 is the oil level position of the oil storage chamber 8. The permanent magnet 13 on the movable end plate 5 generates magnetic coupling with the magnetic flap oil level gauge 12 on the outside of the cabinet side wall 2. The magnetic flap oil level gauge 12 displays the oil level of the oil storage chamber 8. At the same time, the transformer oil expands and contracts with temperature changes, and the corrugated core body vertically expands and contracts, communicating with the atmosphere through the internally arranged breathing tube 7 for breathing, thereby compensating for the volume change of the transformer oil. This device monitors the abnormal situation of the oil level of the switch oil storage cabinet through the oil level gauge 12, and promptly feeds back to the background computer through the control box 14, so that the staff can respond in time. Because the effective compensation cross-section of the corrugated core body remains unchanged during vertical expansion and contraction, the oil level is linearly related to the oil temperature. The oil level gauge 12 displays no error, and the oil level is intuitive, clear, accurate and reliable.

[0031] The beneficial effect of the present invention is that, compared with the prior art,

[0032] 1. Solve the problem that the current open switch oil conservator cannot effectively isolate humid air and transformer oil is prone to deterioration. The insulating oil is completely isolated from the atmosphere, the oil conservator has no condensation, and no desiccant is required, achieving maintenance-free.

[0033] 2. During operation, the corrugated core of the metal corrugated vertical switch oil storage cabinet of the present invention expands and contracts vertically, and the effective compensation cross-sectional area remains unchanged. The transformer oil expands and contracts with temperature changes, and the corrugated core expands and contracts vertically, communicating with the atmosphere through an internal breathing tube for breathing, thereby compensating for volume changes of the transformer oil. The position of the movable end plate is the oil level position of the oil storage chamber. The movable end plate follows the vertical expansion and contraction of the corrugated core. The permanent magnet on the movable end plate generates magnetic coupling with the magnetic flap oil level gauge on the outside of the cabinet side wall, and the magnetic flap oil level gauge displays the oil level of the oil storage chamber. Because the effective compensation cross-sectional area remains unchanged when the corrugated core expands and contracts vertically, the oil level is linearly related to the oil temperature. The oil level gauge displays no errors, and the oil level is intuitive, clear, accurate, and reliable, reserving ample compensation capacity for high and low oil levels, reducing the impact of inaccurate installation and oil filling and temperature differences on the extreme oil level.

[0034] 3. This device uses a magnetic resistance switch set in the oil level gauge. The magnetic resistance switch will continuously output a 4-20mA oil level data remote transmission signal, and then the oil level data analysis unit inside the control box will perform signal conversion, data storage and analysis. The temperature sensor inside the control box will compare and analyze the impact of different ambient temperatures on the oil level to avoid oil level errors caused by thermal expansion and contraction. The control box combines the temperature sensor to comprehensively analyze and confirm the oil level, and then transmits the oil level data to the background computer through RS485 communication. Therefore, when the oil level of this device is abnormal, an oil level abnormality signal will be transmitted to the background computer. At the same time, when the oil level data transmitted by the oil level gauge of the switch oil storage cabinet deviates significantly from the oil level corresponding to the on-site oil temperature curve, the control box 14 will also send an oil level abnormality signal to the background computer. This device has an early warning function for oil level abnormality, so as to achieve timely monitoring and timely feedback to avoid losses.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A fully sealed metal corrugated vertical switch oil conservator, comprising: The cabinet containing transformer oil has a corrugated core placed inside the cabinet for transformer oil compensation and sealing, which is characterized by: The cabinet comprises: a cabinet upper cover (1) and a cabinet side wall (2); a corrugated core is placed inside the cabinet; the corrugated core comprises: a corrugated pipe (4) and a movable end plate (5); the lower end of the corrugated pipe (4) is connected to the movable end plate (5); the upper end of the corrugated pipe (4) is connected to the cabinet upper cover (1); the corrugated core and the interior of the cabinet upper cover (1) form a breathing chamber (6); the outside of the corrugated core and the interior of the cabinet form a fully sealed oil storage chamber (8); the corrugated core vertically expands and contracts in the oil storage chamber (8); an oil level gauge (12) is arranged outside the cabinet; the oil level gauge (12) is connected to a control box (14).

2. A fully sealed metal corrugated vertical switch oil conservator as claimed in claim 1, characterized in that: An oil level gauge (12) is provided on the cabinet side wall (2), a permanent magnet (13) is provided at the lower portion of the movable end plate (5), the oil level gauge (12) and the permanent magnet (13) are magnetically coupled, and the oil level gauge (12) indicates the oil level when the movable end plate (5) moves up and down.

3. A fully sealed metal corrugated vertical switch oil conservator as claimed in claim 2, characterized in that: A magnetic resistance switch is arranged inside the oil level gauge (12).

4. The fully sealed metal corrugated vertical switch oil conservator according to claim 1, characterized in that: A breathing tube (7) is provided on the cabinet upper cover (1), and the breathing cavity (6) is communicated with the atmosphere through the breathing tube (7).

5. The fully sealed metal corrugated vertical switch oil conservator according to claim 1, characterized in that: The cabinet further comprises: a cabinet bottom plate (3); a cabinet upper cover (1) is fixedly connected to the cabinet side wall (2); and the cabinet side wall (2) is fixedly connected to the cabinet bottom plate (3).

6. A fully sealed metal corrugated vertical switch oil conservator as claimed in claim 5, characterized in that: A main connecting pipe (10) is provided on the cabinet bottom plate (3), and the main connecting pipe (10) is connected to the oil tank of the on-load tap-changer body.

7. The fully sealed metal corrugated vertical switch oil conservator according to claim 1, characterized in that: An exhaust pipe (9) is provided on the cabinet side wall (2), the exhaust pipe (9) is communicated with the oil storage chamber (8), and an exhaust valve is installed on the exhaust pipe (9).

8. The fully sealed metal corrugated vertical switch oil conservator according to claim 6, characterized in that: An oil injection and discharge pipe (11) is also provided on the cabinet bottom plate (3), and the oil injection and discharge pipe (11) is communicated with the oil storage chamber (8).

9. The fully sealed metal corrugated vertical switch oil conservator according to claim 1, characterized in that: An oil level data storage and analysis unit and a temperature sensor are arranged in the control box (14).

10. The fully sealed metal corrugated vertical switch oil conservator according to claim 1, characterized in that: The control box (14) is connected to the background computer via RS485 communication mode.

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