CN203444919U - Vacuum oiling and detecting system for transformer - Google Patents

Abstract

The utility model relates to a vacuum oiling and detecting system for a transformer. The vacuum oiling and detecting system for the transformer comprises a corrugated oil conservator and a vacuumizing device, wherein a chamber between the shell of the oil conservator and a corrugated pipe is communicated with an exhaust port; the inner cavity of the corrugated pipe is communicated with a breathing hole; the exhaust port is hermetically communicated with the vacuumizing device by virtue of a first connecting pipe; an exhaust port vacuumizing valve is arranged on the first connecting pipe, whether the chamber between the shell of the oil conservator and the corrugated pipe is communicated with the vacuumizing device or not is controlled by virtue of opening and closing of the exhaust port vacuumizing valve; the breathing hole is hermetically communicated with the vacuumizing device by virtue of a second connecting pipe; a breathing hole vacuumizing device is arranged on the second connecting pipe, and whether the inner cavity of the corrugated pipe is communicated with the vacuumizing device or not is controlled by virtue of opening and closing of the breathing hole vacuumizing device; the breathing hole and/or exhaust port are/is also externally connected with one end of a regulating valve, the other end of the regulating valve is communicated with the air, and whether the breathing hole and/or exhaust port and/is communicated with the air or not is controlled by virtue of opening and closing of the regulating valve.

Description

Vacuum oil filling and detection system for transformers

technical field

The utility model relates to a transformer vacuum oil filling and detection system. Specifically, it is a vacuum oil filling and detection system suitable for a transformer with a corrugated oil conservator.

Background technique

The oil conservator, commonly known as an oil pillow, is placed horizontally above the transformer oil tank and communicates with the transformer oil tank through a butterfly valve and a gas relay. When the transformer oil is heated and expands, the transformer oil flows from the oil tank to the oil storage tank; when the transformer oil contracts when it is cooled, the transformer oil flows from the oil storage tank to the oil tank. Therefore, by installing an oil conservator, the volume expansion or contraction of the transformer oil due to temperature changes can be compensated, and at the same time, the transformer oil can be isolated from the air, which is an important protection component for the safe operation of the transformer. The traditional capsule oil conservator and diaphragm oil conservator are gradually replaced by corrugated oil conservator due to the low mechanical strength of the capsule or diaphragm, which is easy to break and cause oil leakage during use.

Corrugated oil conservator with built-in bellows. The inner cavity of the bellows is an air bag communicating with the atmosphere, one end of which is a freely expandable movable end, and the other end is fixed to the end plate of the corrugated oil conservator by welding. The transformer oil is stored between the oil conservator shell and the outside of the bellows, and communicates with the oil tank of the transformer through a butterfly valve and a gas relay. The inside of the bellows is air, and its fixed end communicates with the outside atmosphere through the breathing port. The chamber between the shell of the oil conservator and the bellows communicates with the outside air through the exhaust port. Normally, the exhaust port is closed and the breathing port is opened. When the volume of transformer oil in the transformer oil tank increases due to temperature rise, the volume increase of the transformer oil enters the shell of the oil conservator through the gas relay and the butterfly valve. In the chamber between the bellows, the pressure in the chamber is greater than the pressure of the air in the bellows, and then the bellows are compressed, so that the volume increment of the transformer oil is transferred to the chamber between the oil conservator shell and the bellows. When the bellows is under pressure, the excess air in its inner cavity is discharged through the breathing port, so that the entire oil conservator is in a state of pressure balance. When the volume of transformer oil in the transformer oil tank shrinks due to temperature drop, the pressure in the cavity between the oil conservator shell and the bellows is lower than the air pressure in the inner cavity of the bellows. Under the action of air pressure, the bellows elongates and Part of the transformer oil stored in the chamber between the oil conservator shell and the bellows is sent back to the oil tank, so that the oil tank is always full of transformer oil. During the elongation of the bellows, outside air enters the inner chamber of the bellows through the breathing port to supplement the pressure. When the volume of transformer oil in the oil tank is compensated, the bellows stop elongating, and the entire oil conservator is in a new pressure balance state. Therefore, when the volume of the transformer oil expands or contracts with temperature changes, the bellows will be compressed or stretched, thereby changing the size of the oil chamber of the bellows oil conservator, and achieving volume compensation under fully sealed conditions.

In order to effectively expel the air bubbles in the transformer and improve the insulation level of the transformer, especially in the case of a large potential difference between turns of the coil, in order to prevent the breakdown accident between the turns caused by the air bubbles, vacuum oiling is required for large transformers.

The publication number is CN103123850A, and the invention patent application titled "a transformer semi-vacuum oiling device and its process" discloses a semi-vacuum oiling device and its process mainly suitable for transformers with corrugated oil conservator, the specific scheme To connect the vacuum unit, the outlet of the corrugated oil conservator of the transformer and the oil storage tank through the control valve of the three-way pipe. Before oil filling, close the oil filling valve between the oil storage tank and the control valve of the three-way pipe, and open the vacuum unit. The vacuum valve between the control valve and the three-way pipe, start the vacuum unit to vacuum the transformer through the exhaust port of the transformer corrugated oil conservator, when the vacuum degree in the transformer reaches the oil filling condition, close the vacuum valve and open The oil injection valve performs vacuum oil injection to the transformer. However, in this operation mode, the transformer is vacuumed through the exhaust port of the corrugated oil conservator, so that the cavity between the oil conservator shell and the bellows is vacuum, and the inner cavity of the bellows is air, which will make the inner cavity of the bellows The pressure is much higher than the pressure of the chamber between the shell of the oil conservator and the bellows, resulting in an unbalanced pressure inside and outside the bellows, which can easily lead to excessive stretching of the bellows and deformation.

Utility model content

Therefore, the technical problem to be solved by the utility model is that in the prior art, the vacuuming process easily causes the pressure imbalance inside and outside the bellows, resulting in excessive stretching and deformation of the bellows, thereby providing a vacuum process that can make the bellows Transformer vacuum oil filling and detection system with internal and external pressure balance.

For solving the problems of the technologies described above, the technical scheme of the utility model is as follows:

The utility model provides a vacuum oil filling and detection system for a transformer, which includes a corrugated oil storage tank and a vacuum pumping device;

The chamber between the oil conservator shell of the corrugated oil conservator and the bellows communicates with the exhaust port; the inner cavity of the bellows communicates with the breathing port;

The exhaust port is sealed and communicated with the vacuum device through the first connecting pipe; the vacuum valve of the exhaust port is arranged on the first connecting pipe, and the opening and closing of the vacuum valve of the exhaust port controls the Whether the chamber between the oil conservator shell and the bellows is connected to the vacuum device;

The breathing port is sealed and communicated with the vacuum device through the second connecting pipe; the vacuuming valve of the breathing port is arranged on the second connecting pipe, and the opening and closing of the vacuuming valve of the breathing port controls the opening and closing of the bellows. Whether the inner cavity is connected with the vacuum device;

The breathing port and/or the exhaust port are also externally connected to one end of the regulating valve, and the other end of the regulating valve is communicated with the air, and the opening and closing of the regulating valve controls the breathing port and/or the exhaust gas. Whether the mouth is connected to the air.

In the transformer vacuum oiling and detection system described in the utility model, the regulating valve includes a first regulating valve and/or a second regulating valve;

One end of the first regulating valve communicates with the breathing port, the other end of the first regulating valve communicates with the air, and the opening and closing of the first regulating valve controls whether the breathing port communicates with the air;

One end of the second regulating valve communicates with the exhaust port, and the other end of the second regulating valve communicates with air, and the opening and closing of the second regulating valve controls whether the exhaust port communicates with air.

In the transformer vacuum oiling and detection system described in the utility model, the breathing port, the second connecting pipe and one end of the first regulating valve are sealed and communicated through a three-way pipe joint and/or the exhaust port, the One end of the first connecting pipe and the second regulating valve is in airtight communication through a three-way pipe joint.

The transformer vacuum oiling and detection system described in the utility model also includes:

A main valve, one end of which is in sealing communication with the vacuum device, and the other end is in sealing communication with the exhaust port vacuum valve and the breathing port vacuum valve, and the exhaust port is controlled by opening and closing the main valve. Whether the mouth vacuum valve and the breathing port vacuum valve communicate with the vacuum device.

The transformer vacuum oiling and detection system described in the utility model also includes:

The pressure vacuum gauge is in sealing communication with the exhaust port vacuum valve, the breathing port vacuum valve and the main valve through a four-way pipe fitting.

In the transformer vacuum oiling and detection system described in the utility model, the first connecting pipe is a transparent steel wire pipe.

The transformer vacuum oiling and detection system described in the utility model also includes:

The inflation device is in sealing communication with the main valve.

In the transformer vacuum oiling and detection system described in the utility model, the main valve, the vacuum device and the inflation device are sealed and connected through a three-way pipe joint.

Compared with the prior art, the above-mentioned technical solution of the utility model has the following advantages:

(1) The utility model provides a transformer vacuum oiling and detection system, including a corrugated oil conservator and a vacuum device; the chamber and the exhaust port between the oil conservator shell and the bellows of the corrugated oil conservator connected; the inner cavity of the bellows communicates with the breathing port; the exhaust port is sealed and communicated with the vacuum device through the first connecting pipe; the vacuum valve for the exhaust port is arranged on the first connecting pipe, through The opening and closing of the vacuum valve at the exhaust port controls whether the chamber between the shell of the oil conservator and the bellows communicates with the vacuum device; The vacuum pumping device is sealed and connected; the breathing port vacuum valve is arranged on the second connecting pipe, and the opening and closing of the breathing port vacuum valve controls whether the inner cavity of the bellows is connected to the vacuum pumping device. communication; the breathing port and/or the exhaust port are also externally connected to one end of the regulating valve, and the other end of the regulating valve is communicated with the air, and the opening and closing of the regulating valve controls the breathing port and/or the Whether the exhaust port is connected to the air.

When vacuuming, close the regulating valve, open the vacuum valve of the exhaust port and the vacuum valve of the breathing port, and perform vacuuming operation on the corrugated oil conservator, because the corrugated oil conservator passes through the gas relay and the butterfly valve. It communicates with the transformer, and then can complete the vacuuming operation of the whole transformer. Because the exhaust port and the breathing port are vacuumed at the same time, the chamber between the oil conservator shell and the bellows and the inner cavity of the bellows are all in a vacuum state, which balances the pressure inside and outside the bellows and avoids damage to the bellows. Excessive stretching can cause irreversible damage. After vacuuming to the specified value, it needs to be kept for 2 hours. After the vacuum degree of the transformer meets the requirements, the transformer oil can be injected into the transformer through the oil injection port.

As an optional implementation, the regulating valve includes a first regulating valve and/or a second regulating valve; one end of the first regulating valve communicates with the breathing port, and the other end of the first regulating valve It communicates with the air, and controls whether the breathing port communicates with the air through the opening and closing of the first regulating valve; one end of the second regulating valve communicates with the exhaust port, and the other end of the second regulating valve communicates with the air outlet. The air is communicated, and the opening and closing of the second regulating valve controls whether the exhaust port is communicated with the air.

After the transformer is vacuum filled with oil, if the oil volume in the transformer is lower than the set value for the case of only the first regulating valve, close the vacuum valve at the exhaust port, open the vacuum valve at the breathing port and close the first regulating valve at the same time. Continue to vacuumize the inner cavity of the bellows, so that the external pressure of the bellows is greater than the inner pressure of the bellows, and the bellows is compressed, thereby increasing the amount of oil injected into the transformer; if the amount of oil in the transformer is higher than the set value, open the drain Vacuumize the valve at the air port, close the vacuum valve at the breathing port, and at the same time properly adjust the first regulating valve to put in some air to reduce the vacuum in the inner cavity of the bellows, so that the pressure in the inner cavity of the bellows is greater than the pressure outside the bellows, and the bellows is pulled extension, thereby reducing the amount of oil injected into the transformer. For the case where only the second regulating valve is included, if the oil volume in the transformer is lower than the set value, close the vacuum valve at the exhaust port, open the vacuum valve at the breathing port, and at the same time properly adjust the second regulating valve to put in some air to Reduce the vacuum degree in the chamber between the shell of the oil conservator and the bellows, so that the external pressure of the bellows is greater than the pressure inside the bellows, and the bellows is compressed, thereby increasing the amount of oil injected into the transformer; if the oil volume in the transformer is high If it is lower than the set value, close the vacuum valve of the breathing port, open the vacuum valve of the exhaust port and close the second regulating valve at the same time, continue to vacuum the chamber between the oil conservator shell and the bellows, so that the pressure in the inner cavity of the bellows Greater than the pressure on the outside of the bellows, the bellows is stretched, thereby reducing the amount of oil injected into the transformer. For the case that includes both the first regulating valve and the second regulating valve, if the oil volume in the transformer is lower than the set value, close the vacuum valve at the exhaust port, and at this time, the first regulating valve remains closed after vacuum oil filling , adjust the second regulating valve to put in some air to reduce the vacuum in the chamber between the oil conservator shell and the bellows, so that the external pressure of the bellows is greater than the pressure in the inner cavity, and the bellows is compressed, thereby increasing the pressure on the transformer If the amount of oil in the transformer is higher than the set value, close the vacuum valve at the breathing port. At this time, the second regulating valve remains closed after vacuum oil filling, and adjust the first regulating valve to put in some air to reduce ripples. The vacuum in the inner cavity of the tube makes the pressure in the inner cavity of the bellows greater than the pressure outside the bellows, and the bellows is stretched, thereby reducing the amount of oil injected into the transformer. Therefore, the transformer vacuum oiling and detection system described in the utility model can make the oiling amount of the transformer close to the set value by adjusting the regulating valve. After the oil filling volume of the transformer is adjusted, open the regulating valve to restore normal pressure inside the bellows, and the vacuum oil filling operation is all over.

(2) In the transformer vacuum oiling and detection system described in the present invention, the breathing port, the second connecting pipe and one end of the first regulating valve are sealed and communicated through a three-way pipe joint and/or the exhaust The port, the first connecting pipe and one end of the second regulating valve are in sealed communication through a three-way pipe joint. Because the three-way pipe joint has three connecting joints, it is very convenient to realize the sealing communication between the breathing port, the second connecting pipe and one end of the regulating valve and/or the exhaust port, the One end of the first connecting pipe and the second regulating valve is in airtight communication through a three-way pipe joint.

(3) The transformer vacuum oiling and detection system described in the utility model also includes: a main valve, one end of which is in sealing communication with the vacuum device, and the other end is connected with the vacuum valve of the exhaust port and the breathing port respectively. The vacuum valve is sealed and connected, and the opening and closing of the main valve controls whether the vacuum valve of the exhaust port and the vacuum valve of the breathing port are connected with the vacuum device. By setting the main valve, it can work together with the vacuum valve at the exhaust port to prevent the transformer oil from entering the vacuum device from the first connecting pipe, causing damage to the vacuum device, and realizing double insurance control.

(4) The transformer vacuum oiling and detection system described in the utility model also includes: a pressure vacuum gauge, which is sealed with the exhaust port vacuum valve, the breathing port vacuum valve and the main valve through a four-way pipe fitting. connected. Because the four-way pipe fitting has four interconnected connectors, it is possible to realize the sealed communication between the pressure vacuum gauge, the exhaust port vacuum valve, the breathing port vacuum valve and the main valve, and the operation The personnel can obtain the vacuum degree of the transformer by reading the pressure vacuum gauge, and then make an accurate judgment on whether to continue to vacuumize the transformer. In addition, the pressure vacuum gauge, the vacuum valve at the exhaust port, the vacuum valve at the breathing port, and the main valve are sealed and communicated through four-way pipe fittings, and are combined into a valve assembly, which is convenient for use in practical applications. promotion and distribution.

(5) In the transformer vacuum oiling and detection system described in the utility model, the first connecting pipe is a transparent steel wire pipe. The transparent steel wire tube is a PVC hose embedded with a steel wire skeleton, which is non-toxic, transparent, high-strength, corrosion-resistant, and fluid transportation is visible. Therefore, during the vacuum oiling operation, the operator can easily observe whether the transformer oil has entered The first connecting pipe, if it is observed that the transformer oil enters the first connecting pipe, it will quickly close the vacuum valve and the main valve at the exhaust port to prevent the transformer oil from entering the vacuum device and causing damage to it.

(6) The transformer vacuum oiling and detection system described in the utility model also includes: an air charging device, which is in sealing communication with the main valve. As an optional implementation manner, the main valve, the vacuum device and the inflation device are in sealed communication through a three-way pipe joint.

When the vacuum oiling operation is finished, close the vacuum valve, regulating valve and vacuum device at the exhaust port, and open the vacuum valve and the main valve at the breathing port. Vacuuming the valve and the breathing port can pressurize the inner cavity of the bellows, so that the pressure inside and outside the bellows is unbalanced, stretched outward, and then pressurize the transformer, which is convenient for pressure-bearing leak testing of the transformer. Therefore, the utility model provides a transformer vacuum oil filling and detection system integrating vacuum pumping, oil filling volume adjustment and pressure-bearing leak test, which reduces the workload of disassembly and improves work efficiency.

Description of drawings

In order to make the content of the utility model easier to understand clearly, the utility model will be described in further detail below according to specific embodiments of the utility model in conjunction with the accompanying drawings, wherein

Fig. 1 is the structural representation of the transformer vacuum oil filling and detection system with only the first regulating valve described in the utility model;

Fig. 2 is the structural representation of the transformer vacuum oiling and detection system with only the second regulating valve described in the utility model;

Fig. 3 is a structural schematic diagram of a vacuum oiling and detection system for a transformer having both a first regulating valve and a second regulating valve according to the present invention.

The reference signs in the figure are: 1-corrugated oil conservator, 2-vacuumizing device, 3-vacuumizing valve at exhaust port, 4-vacuumizing valve at breathing port, 5a-first regulating valve, 5b-second regulating valve Valve, 6-main valve, 7-pressure vacuum gauge, 8-inflatable device, 11-oil conservator shell, 12-bellows, 13-exhaust port, 14-breathing port, 15-oil filling port, 16-butterfly valve, 17-gas relay, 3a-first connecting pipe, 4a-second connecting pipe.

Detailed ways

Example 1

This embodiment provides a transformer vacuum oiling and testing system, as shown in FIG. 1 , FIG. 2 , and FIG.

The chamber between the oil conservator shell 11 and the bellows 12 of the corrugated oil conservator 1 communicates with the exhaust port 13 ; the inner cavity of the bellows 12 communicates with the breathing port 14 .

The exhaust port 13 is in sealing communication with the vacuum device 2 through the first connecting pipe 3a; the exhaust port vacuum valve 3 is arranged on the first connecting pipe 3a, and the exhaust port vacuum valve 3 control whether the chamber between the oil conservator shell 11 and the bellows 12 communicates with the vacuum device 2 .

The breathing port 14 is in sealing communication with the vacuum device 2 through the second connecting pipe 4a; the breathing port vacuum valve 4 is arranged on the second connecting pipe 4a, and the opening and closing of the breathing port vacuum valve 4 Controlling whether the inner chamber of the bellows 12 communicates with the vacuum device 2 or not.

The breathing port 14 and/or the exhaust port 13 are also externally connected to one end of the regulating valve, and the other end of the regulating valve is communicated with the air, and the opening and closing of the regulating valve controls the breathing port 14 and/or the regulating valve. Whether the exhaust port 13 communicates with the air.

The vacuum pumping device 2 can be a vacuum pump. When vacuuming, close the regulating valve, open the exhaust port vacuum valve 3 and the breathing port vacuum valve 4, and perform vacuum pumping operation on the corrugated oil conservator 1, because the corrugated oil conservator 1 passes through The gas relay 17 and the butterfly valve 16 communicate with the transformer, so as to complete the vacuuming operation of the entire transformer. Because the exhaust port 13 and the breathing port 14 are vacuumed at the same time, the chamber between the oil conservator shell 11 and the bellows 12 and the inner cavity of the bellows 12 are all in a vacuum state, so that the internal and external pressure of the bellows 12 Balance, to avoid irreversible damage caused by excessive stretching of the bellows 12. After vacuuming to the specified value, it needs to be kept for 2 hours (transformers with different voltage levels have different requirements for the holding time, and the general vacuuming time is between one-third and one-half of the holding time after vacuuming). After setting, if the vacuum degree meets the requirements for oil injection, inject transformer oil into the transformer at a speed of 3 tons/hour to 5 tons/hour until the oil surface of the gas relay is visible, and continue to vacuum for more than 4 hours to ensure that the transformer winding The bubbles are well separated out and the vacuum degree is kept good, indicating that the seal between the transformer oil tank and the corrugated oil conservator 1 is good, and oil can be continuously filled into the corrugated oil conservator 1. An oil level gauge is provided on the side of the corrugated oil conservator 1, and the oil filling quantity of the transformer can be obtained through the oil level gauge. If the oil filling amount of the transformer reaches the preset value, the oil filling is stopped.

As an optional implementation manner, in the transformer vacuum oiling and detection system described in this embodiment, the regulating valve includes a first regulating valve 5a and/or a second regulating valve 5b.

One end of the first regulating valve 5a communicates with the breathing port 14, and the other end of the first regulating valve 5a communicates with the air. Is it connected.

One end of the second regulating valve 5b communicates with the exhaust port 13, the other end of the second regulating valve 5b communicates with the air, and the opening and closing of the second regulating valve 5b controls the exhaust port 13 Whether it is connected with air.

After the transformer is vacuum filled with oil, as shown in Figure 1, for the case of only the first regulating valve 5a, if the oil volume in the transformer is lower than the set value, then close the exhaust port vacuum valve 3, and open the breathing port to vacuum Valve 4 and the first regulating valve 5a remain closed, and continue to vacuumize the inner cavity of the bellows 12. Driven by the newly injected transformer oil, the bellows 12 is compressed, and when the internal and external pressures of the bellows 12 are in balance again In this state, the oil injection stops, thereby increasing the oil injection volume of the transformer; if the oil volume in the transformer is higher than the set value, open the vacuum valve 3 at the exhaust port, close the vacuum valve 4 at the breathing port, and at the same time properly adjust the first Adjust the valve 5a, put in some air to reduce the vacuum degree of the inner cavity of the bellows 12, so that the pressure in the inner cavity of the bellows 12 is greater than the pressure outside the bellows 12, and the bellows 12 is stretched, thereby reducing the amount of oil injected into the transformer .

As shown in Figure 2, for the case where only the second regulating valve 5b is included, if the oil volume in the transformer is lower than the set value, close the vacuum valve 3 at the exhaust port, open the vacuum valve 4 at the breathing port, and adjust it appropriately The second regulating valve 5b puts in part of the air to reduce the vacuum degree in the chamber between the oil conservator shell 11 and the bellows 12, so that the external pressure of the bellows 12 is greater than the inner pressure of the bellows 12, and the bellows 12 is compressed, thereby Increase the amount of oil injected into the transformer; if the amount of oil in the transformer is higher than the set value, close the vacuum valve 4 at the breathing port, open the vacuum valve 3 at the exhaust port and close the second regulating valve 5b at the same time, and continue to clean the oil conservator The chamber between the shell 11 and the bellows 12 is evacuated, so that the pressure in the inner cavity of the bellows 12 is greater than the pressure outside the bellows 12, and the bellows 12 is stretched, thereby reducing the amount of oil injected into the transformer.

As shown in Figure 3, for the situation that includes both the first regulating valve 5a and the second regulating valve 5b, if the oil volume in the transformer is lower than the set value, then close the exhaust port vacuum valve 3 and open the breathing port vacuum pump. The vacuum valve 4 continues to evacuate the inner cavity of the bellows 12. At this time, the first regulating valve 5a remains closed after vacuum oiling, and the second regulating valve 5b is adjusted to put in some air to lower the oil conservator shell 11 and the bellows. The vacuum in the chamber between 12 makes the external pressure of the bellows 12 greater than the inner pressure of the bellows 12, and the bellows 12 is compressed, thereby increasing the amount of oil injected into the transformer; if the amount of oil in the transformer is higher than the set value, Then close the vacuum valve 4 at the breathing port, open the vacuum valve 3 at the exhaust port, and keep the closed state after the second regulating valve 5b is vacuum-filled at this time, and continue to pump the chamber between the oil conservator shell 11 and the bellows 12. Vacuum, adjust the first regulating valve 5a to put in some air to reduce the vacuum degree of the inner cavity of the bellows 12, so that the pressure in the inner cavity of the bellows 12 is greater than the pressure outside the bellows 12, and the bellows 12 is stretched, thereby reducing the pressure on the transformer. of oil injection.

The three adjustment methods mentioned above can realize the adjustment of the oil injection amount of the transformer by adjusting the internal and external pressure of the bellows 12 and controlling the stretching or contraction of the bellows 12 . Among them, the most preferred solution is the situation that only includes the first regulating valve 5a, because the first regulating valve 5a only communicates with the inner cavity of the bellows 12 and the outside air, and the inner cavity of the bellows 12 is connected with the transformer in the corrugated oil conservator. The oil is not in contact, which can ensure that when the air enters the inner cavity of the bellows 12, it does not contact with the transformer oil, thus avoiding air pollution to the transformer oil.

The transformer vacuum oiling and detection system described in this embodiment can fine-tune the oiling amount of the transformer by adjusting the regulating valve, so that the oiling amount of the transformer is closer to the set value. After the oil filling amount of the transformer is adjusted, the regulating valve is opened to restore normal pressure inside the bellows 12, and the vacuum oil filling operation is all finished.

As an optional implementation, as shown in Fig. 1, Fig. 2 and Fig. 3, the transformer vacuum oil filling and detection system described in this embodiment, the breathing port 14, the second connecting pipe 4a and the One end of the first regulating valve 5a is in sealing communication through a three-way pipe joint and/or one end of the exhaust port 13, the first connecting pipe 3a and the second regulating valve 5b is in sealing communication through a three-way pipe joint.

Because the three-way pipe joint has three connecting joints, it is very convenient to realize the sealing communication between the breathing port, the second connecting pipe and one end of the regulating valve and/or the exhaust port, the One end of the first connecting pipe and the second regulating valve is in airtight communication through a three-way pipe joint.

Example 2

On the basis of Embodiment 1, the transformer vacuum oiling and detection system described in this embodiment, as shown in Figure 1, Figure 2, and Figure 3, also includes:

The main valve 6, one end of which is in sealing communication with the vacuum device 2, and the other end is in sealing communication with the exhaust port vacuum valve 3 and the breathing port vacuum valve 4 respectively, through the opening and closing of the main valve 6 Control whether the exhaust port vacuum valve 3 and the breathing port vacuum valve 4 communicate with the vacuum device 2 .

By setting the main valve 6, it can work together with the vacuum valve 3 at the exhaust port to prevent the transformer oil from entering the vacuum device 2 from the first connecting pipe 3a during vacuum oil filling, causing damage to the vacuum device 2, and realizing double insurance control .

As a preferred implementation, the transformer vacuum oiling and detection system described in this embodiment also includes:

The pressure vacuum gauge 7 is in sealing communication with the exhaust port vacuum valve 3, the breathing port vacuum valve 4 and the main valve 6 through a four-way pipe fitting.

Because the four-way pipe fitting has four interconnected connectors, the connection between the pressure vacuum gauge 7, the exhaust port vacuum valve 3, the breathing port vacuum valve 4 and the main valve 6 can be realized. Sealed and connected, the operator can obtain the vacuum degree of the transformer by reading the pressure vacuum gauge, and then make an accurate judgment on whether to continue to vacuumize the transformer. In addition, the pressure vacuum gauge 7, the exhaust port vacuum valve 3, the breathing port vacuum valve 4 and the main valve 6 are sealed and communicated through the four-way pipe fittings, and are combined into a valve assembly. In the process, it is convenient for promotion and circulation.

As a preferred implementation mode, in the transformer vacuum oiling and detection system described in this embodiment, the first connecting pipe 3a is a transparent steel wire pipe.

The transparent steel wire tube is a PVC hose embedded with a steel wire skeleton, which is non-toxic, transparent, high-strength, corrosion-resistant, and fluid transportation is visible. Therefore, during the vacuum oiling operation, the operator can easily observe whether the transformer oil has entered If the first connecting pipe 3a observes that the transformer oil enters the first connecting pipe 3a, it will quickly close the vacuum valve 3 and the main valve 6 at the exhaust port to prevent the transformer oil from entering the vacuum device 2 and causing damage to it.

Example 3

On the basis of Embodiment 1 or Embodiment 2, the transformer vacuum oiling and detection system described in this embodiment, as shown in Figure 1, Figure 2, and Figure 3, also includes:

The inflation device 8 is in sealing communication with the main valve 6 .

The inflation device 8 can be an air pump.

As an optional implementation mode, in the transformer vacuum oiling and detection system described in this embodiment, the main valve 6, the vacuum device 2 and the inflation device 8 are in sealed communication through a three-way pipe joint.

When the vacuum oiling operation is finished, close the exhaust port vacuum valve 3, the regulating valve and the vacuum device 2, and open the breathing port vacuum valve 4 and the main valve 6, because the inflation device 8 is sealed with the main valve 6 through the three-way pipe joint Therefore, the inflatable device 8 is opened, and air pressure can be added to the inner cavity of the bellows 12 through the main valve 6 and the vacuum valve 4 of the breathing port, so that the internal and external pressures of the bellows 12 are unbalanced, stretched outward, and then the transformer is pressurized . After generally increasing the air pressure to 0.035pa, close the main valve 6 and stop the inflation. Keep it for 12 hours, if there is no leakage and abnormality, it means that the pressure leak test is qualified. Therefore, this embodiment provides a transformer vacuum oil filling and detection system integrating vacuum pumping, oil injection quantity adjustment and pressure leak test detection, which reduces the workload of disassembly and improves work efficiency.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the scope of protection of the utility model.

Claims (8)

1. transformer vacuum oil, a detection system, is characterized in that, comprises bellow oil conservator (1) and vacuum extractor (2);

The oil conservator shell (11) of described bellow oil conservator (1) is communicated with exhaust outlet (13) with the chamber between bellows (12); The inner chamber of described bellows (12) is communicated with pneumostome (14);

Described exhaust outlet (13) is communicated with described vacuum extractor (2) sealing by the first tube connector (3a); It is upper that exhaust outlet vacuum-pumping valve (3) is arranged at described the first tube connector (3a), by the chamber between oil conservator shell (11) described in the open and close controlling of described exhaust outlet vacuum-pumping valve (3) and described bellows (12) with whether being communicated with between described vacuum extractor (2);

Described pneumostome (14) is communicated with described vacuum extractor (2) sealing by the second tube connector (4a); It is upper that pneumostome vacuum-pumping valve (4) is arranged at described the second tube connector (4a), and whether the inner chamber by bellows (12) described in the open and close controlling of described pneumostome vacuum-pumping valve (4) is with being communicated with between described vacuum extractor (2);

Described pneumostome (14) and/or described exhaust outlet (13) be one end of external control valve also, whether the other end of described control valve and air communication, be communicated with air by pneumostome (14) described in the open and close controlling of described control valve and/or described exhaust outlet (13).

2. transformer vacuum oil according to claim 1, detection system, is characterized in that:

Described control valve comprises the first control valve (5a) and/or the second control valve (5b);

One end of described the first control valve (5a) is communicated with described pneumostome (14), whether the other end and the air communication of described the first control valve (5a), be communicated with air by pneumostome (14) described in the open and close controlling of described the first control valve (5a);

One end of described the second control valve (5b) is communicated with described exhaust outlet (13), whether the other end and the air communication of described the second control valve (5b), be communicated with air by exhaust outlet (13) described in the open and close controlling of described the second control valve (5b).

3. transformer vacuum oil according to claim 2, detection system, is characterized in that:

One end that one end of described pneumostome (14), described the second tube connector (4a) and described the first control valve (5a) seals connection and/or described exhaust outlet (13), described the first tube connector (3a) and described the second control valve (5b) by tee pipe coupling seals connection by tee pipe coupling.

4. transformer vacuum oil according to claim 3, detection system, is characterized in that, also comprises:

Total valve (6), its one end is communicated with described vacuum extractor (2) sealing, whether the other end is communicated with the sealing of described exhaust outlet vacuum-pumping valve (3) and described pneumostome vacuum-pumping valve (4) respectively, by between exhaust outlet vacuum-pumping valve (3) described in the open and close controlling of described total valve (6) and described pneumostome vacuum-pumping valve (4) and described vacuum extractor (2), be communicated with.

5. transformer vacuum oil according to claim 4, detection system, is characterized in that, also comprises:

Pressure vacuum meter (7), is communicated with described exhaust outlet vacuum-pumping valve (3), described pneumostome vacuum-pumping valve (4) and described total valve (6) sealing by four-way pipe fitting.

6. transformer vacuum oil according to claim 5, detection system, is characterized in that:

Described the first tube connector (3a) is selected transparent steel wire tube.

7. according to claim 1-6 arbitrary described transformer vacuum oil, detection system, it is characterized in that, also comprise:

Aerating device (8), is communicated with described total valve (6) sealing.

8. transformer vacuum oil according to claim 7, detection system, is characterized in that:

Described total valve (6), described vacuum extractor (2) and described aerating device (8) seal connection by tee pipe coupling.

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