Floor type pressure balance structure used in power transformation system

Abstract

The utility model belongs to the technical field of transformer oil storage compensation in the electric power transformation industry, and particularly relates to a floor type pressure balance structure used in a power transformation system. A metal corrugated oil conservator is arranged on the ground and is connected with a transformer through a pipeline arranged on the ground or underground; a pressure balance system consisting of a pressure sensor, a pressure pump and a balance oil tank is arranged on the pipeline and is controlled by a control module integrated on the metal corrugated oil conservator; when the oil level changes, the pressure change is sensed through the pressure sensor, the control module controls the pressure pump to do work, and active balance is achieved. The oil conservator does not occupy the upper space of the transformer oil tank, does not affect the arrangement of other parts, reduces the strength requirement of the transformer oil tank, has an active pressure compensation function, can counteract the siphonic effect on the transformer oil tank and the oil conservator core body after the position of the oil conservator is lowered, protects the transformer oil tank and the oil conservator core body, and improves the service life of the transformer oil tank. The device is suitable for large-specification transformer oil storage equipment.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the transformer oil storage compensation technical field of electric power transformation industry, specifically, it is a floor type pressure balance structure used in a power transformation system. BACKGROUND

[0002] When the oil-immersed transformer in the power transformation system is running, heat is generated inside the transformer, which increases the temperature of the transformer oil in the oil tank. Because the transformer oil expands and contracts with temperature changes, and the oil tank of the oil-immersed transformer is completely sealed, the internal pressure of the oil tank increases when the transformer oil expands, which causes the oil tank to deform and even be damaged. Therefore, a volume compensation device needs to be provided for the oil tank to introduce excess oil into the compensation device when the transformer oil in the oil tank expands, thereby releasing pressure. Conversely, when the transformer oil in the oil tank contracts, the required oil is introduced from the compensation device. In this way, the transformer oil tank can be protected from damage due to temperature changes.

[0003] The conventional design scheme is to install an oil storage tank on the upper part of the transformer oil tank, which is connected to the transformer oil tank through a pipeline. The transformer oil tank has two functions: one is to provide space for the transformer oil in the transformer oil tank to expand and contract with temperature changes; the other is to separate the transformer oil from the external atmosphere to prevent the transformer oil from contacting water vapor and oxygen in the air, which can cause aging and deterioration.

[0004] Currently, with the increase of the transformation level, the size of the transformer and the oil storage tank is becoming larger and larger, and the deficiencies of the conventional design scheme are gradually magnified, mainly in the following aspects:

[0005] 1. The oil storage tank is usually installed on the top of the transformer oil tank, but due to the arrangement of the insulating sleeve and other structures on the top of the transformer oil tank, the space occupied by the oversized oil storage tank will affect the arrangement of other components and the insulation distance between other electrical elements.

[0006] 2. When the oil storage tank is installed on the upper part of the transformer oil tank, the weight of the oil storage tank becomes one of the loads of the transformer oil tank, and the full load weight of the oil storage tank can reach 1 / 4 of the transformer oil storage capacity. The linear increase of the weight of the oil storage tank leads to a geometric multiple increase in the structural strength requirement of the transformer oil tank, and the material cost and manufacturing cost also increase.

[0007] 3. During routine maintenance and repair of the equipment, the oil storage tank is placed on the upper part of the transformer oil tank, which requires operators to work at a high altitude, and requires the provision of corresponding climbing and hoisting equipment, which increases the complexity of maintenance and repair work. At the same time, in order to protect the operating personnel, the transformer needs to be powered off, which causes economic losses.

[0008] If the transformer and the oil conservator continue to increase in size, the oil conservator arranged on the top of the transformer tank will not be applicable, and arranging the oil conservator on the ground will be the final solution.

[0009] So far, there is no successful example of moving the oil storage device to the ground in the industry. The invention patent with the publication number CN102024549A disclosed on April 20, 2011 discloses a "floor type oil conservator", which is a scheme of placing the oil conservator below the position of the transformer tank cover. However, this scheme has technical defects.

[0010] Due to the characteristics of the metal corrugated oil conservator, the oil level height is indefinite. In the conventional design scheme, the metal corrugated oil conservator is installed on the upper part of the transformer tank, the transformer tank is the main load-bearing structure, and the metal corrugated oil conservator hardly bears load. Therefore, the transformer tank is generally designed as a structure capable of bearing a certain amount of outward load, and the core of the metal corrugated oil conservator is designed as a structure capable of bearing a certain amount of inward load. When the oil conservator is arranged on the ground, due to the indefiniteness of the oil level of the oil conservator, the height difference between the oil level of the oil conservator and the oil level of the transformer must exist. When the oil level of the oil conservator is lower than the oil level of the transformer, due to the siphon effect, the core of the oil conservator is subjected to positive pressure and outward load, and the transformer tank is subjected to negative pressure and inward load. These two kinds of loads are additional loads beyond the conventional design. Because the load direction does not match the structure, it will cause damage to the core of the oil conservator or the transformer tank, and affect the operation of the core of the oil conservator and the transformer. Practical new type content

[0011] In order to solve the problem that the floor type oil conservator is affected by the siphon effect caused by the height difference between the oil level and the transformer oil level, the purpose of the present application is to provide a floor type pressure balance structure for a power transformation system.

[0012] The purpose of the present application is achieved by the following technical solutions:

[0013] The utility model discloses a metal corrugated oil storage tank and pressure balance system, the metal corrugated oil storage tank is floor type oil storage tank, namely the metal corrugated oil storage tank is installed on the ground, the pressure balance system includes oil storage tank end pressure sensor, oil storage tank end pressure pump, balance oil tank, transformer end pressure pump and transformer end pressure sensor, one interface of balance oil tank is connected with the metal corrugated oil storage tank through pipeline A, and the pipeline A is installed with oil storage tank end pressure sensor and oil storage tank end pressure pump respectively, and the other interface of balance oil tank is connected with one end of transformer end pressure pump through pipeline B, and the other end of transformer end pressure pump is connected with transformer through pipeline C, and transformer end pressure sensor is installed on the pipeline C, the control module is integrated on the metal corrugated oil storage tank, and oil storage tank end pressure sensor, oil storage tank end pressure pump, transformer end pressure pump and transformer end pressure sensor are connected with control module respectively.

[0014] Among them: balance oil tank, pipeline B and transformer end pressure pump are arranged below the ground.

[0015] Balance oil tank is connected with the bottom of metal corrugated oil storage tank through pipeline A.

[0016] The metal corrugated oil storage tank is an inner oil type metal corrugated oil storage tank or an outer oil type metal corrugated oil storage tank.

[0017] The metal corrugated oil storage tank is a vertical metal corrugated oil storage tank, that is, the expansion direction of the corrugated core body in the metal corrugated oil storage tank is a vertical direction perpendicular to the horizontal plane.

[0018] The oil storage tank end pressure sensor is close to the pipeline interface end of the metal corrugated oil storage tank, and the transformer end pressure sensor is close to the pipeline interface end of the transformer.

[0019] The utility model discloses a metal corrugated oil storage tank and pressure balance system, the metal corrugated oil storage tank is floor type oil storage tank, namely the metal corrugated oil storage tank is installed on the ground, the pressure balance system includes oil storage tank end pressure sensor, oil storage tank end pressure pump, balance oil tank, transformer end pressure pump and transformer end pressure sensor, one interface of balance oil tank is connected with the metal corrugated oil storage tank through pipeline A, and the pipeline A is installed with oil storage tank end pressure sensor and oil storage tank end pressure pump respectively, and the other interface of balance oil tank is connected with one end of transformer end pressure pump through pipeline B, and the other end of transformer end pressure pump is connected with transformer through pipeline C, and transformer end pressure sensor is installed on the pipeline C, the control module is integrated on the metal corrugated oil storage tank, and oil storage tank end pressure sensor, oil storage tank end pressure pump, transformer end pressure pump and transformer end pressure sensor are connected with control module respectively.

[0020] 1. The utility model discloses a metal corrugated oil storage tank and pressure balance system, the metal corrugated oil storage tank is floor type oil storage tank, namely the metal corrugated oil storage tank is installed on the ground, the pressure balance system includes oil storage tank end pressure sensor, oil storage tank end pressure pump, balance oil tank, transformer end pressure pump and transformer end pressure sensor, one interface of balance oil tank is connected with the metal corrugated oil storage tank through pipeline A, and the pipeline A is installed with oil storage tank end pressure sensor and oil storage tank end pressure pump respectively, and the other interface of balance oil tank is connected with one end of transformer end pressure pump through pipeline B, and the other end of transformer end pressure pump is connected with transformer through pipeline C, and transformer end pressure sensor is installed on the pipeline C, the control module is integrated on the metal corrugated oil storage tank, and oil storage tank end pressure sensor, oil storage tank end pressure pump, transformer end pressure pump and transformer end pressure sensor are connected with control module respectively.

[0021] 2. Compared with the traditional oil storage tank, the floor type metal corrugated oil storage tank of the utility model reduces the weight pressure on the transformer oil tank, so that the oil tank design can be more lightweight, and the strength requirement of the transformer oil tank is reduced.

[0022] 3. The utility model discloses a metal corrugated oil storage tank and pressure balance system, the metal corrugated oil storage tank is floor type oil storage tank, namely the metal corrugated oil storage tank is installed on the ground, the pressure balance system includes oil storage tank end pressure sensor, oil storage tank end pressure pump, balance oil tank, transformer end pressure pump and transformer end pressure sensor, one interface of balance oil tank is connected with the metal corrugated oil storage tank through pipeline A, and the pipeline A is installed with oil storage tank end pressure sensor and oil storage tank end pressure pump respectively, and the other interface of balance oil tank is connected with one end of transformer end pressure pump through pipeline B, and the other end of transformer end pressure pump is connected with transformer through pipeline C, and transformer end pressure sensor is installed on the pipeline C, the control module is integrated on the metal corrugated oil storage tank, and oil storage tank end pressure sensor, oil storage tank end pressure pump, transformer end pressure pump and transformer end pressure sensor are connected with control module respectively.

[0023] 4. The utility model discloses a metal corrugated oil storage tank and pressure balance system, the metal corrugated oil storage tank is floor type oil storage tank, namely the metal corrugated oil storage tank is installed on the ground, the pressure balance system includes oil storage tank end pressure sensor, oil storage tank end pressure pump, balance oil tank, transformer end pressure pump and transformer end pressure sensor, one interface of balance oil tank is connected with the metal corrugated oil storage tank through pipeline A, and the pipeline A is installed with oil storage tank end pressure sensor and oil storage tank end pressure pump respectively, and the other interface of balance oil tank is connected with one end of transformer end pressure pump through pipeline B, and the other end of transformer end pressure pump is connected with transformer through pipeline C, and transformer end pressure sensor is installed on the pipeline C, the control module is integrated on the metal corrugated oil storage tank, and oil storage tank end pressure sensor, oil storage tank end pressure pump, transformer end pressure pump and transformer end pressure sensor are connected with control module respectively. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Wherein: 1 is a corrugated metal oil tank, 2 is an oil tank end pressure sensor, 3 is an oil tank end pressure pump, 4 is a balance oil tank, 5 is a transformer end pressure pump, 6 is a transformer end pressure sensor, 7 is a transformer, 8 is a control module, 9 is pipeline A, 10 is pipeline B, and 11 is pipeline C. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] like Figure 1 As shown, this utility model includes a corrugated metal oil tank 1 and a pressure balancing system. The corrugated metal oil tank 1 is a floor-mounted oil tank, that is, the corrugated metal oil tank 1 is installed on the ground 12. It is installed at a set position on the ground 12 according to specific engineering requirements. There is a height difference between the oil level of the corrugated metal oil tank 1 and the oil level of the transformer 7. A pressure balancing system is installed on the pipeline between the floor-mounted oil conservator and the oil tank of transformer 7 to achieve pressure balance between the floor-mounted oil conservator and the oil tank of transformer 7. The pressure balancing system includes an oil conservator end pressure sensor 2, an oil conservator end pressure pump 3, a balancing oil tank 4, a transformer end pressure pump 5, and a transformer end pressure sensor 6. One interface of the balancing oil tank 4 is connected to the corrugated metal oil conservator 1 through pipeline A9. The oil conservator end pressure sensor 2 and the oil conservator end pressure pump 3 are installed on pipeline A9. The other interface of the balancing oil tank 4 is connected to one end of the transformer end pressure pump 5 through pipeline B10. The other end of the transformer end pressure pump 5 is connected to transformer 7 through pipeline C11. The transformer end pressure sensor 6 is installed on pipeline C11. The corrugated metal oil conservator 1 integrates a control module 8. The oil conservator end pressure sensor 2, the oil conservator end pressure pump 3, the transformer end pressure pump 5, and the transformer end pressure sensor 6 are connected to the control module 8 through cables.

[0028] The oil tank end pressure pump 3 and the transformer end pressure pump 5 in this embodiment are both existing technologies and are driven by servo motors, so they will not be described in detail here.

[0029] To reduce ground occupation, in this embodiment, the balance oil tank 4, pipeline B10 and transformer end pressure pump 5 are installed below ground level 12.

[0030] In this embodiment, the balance oil tank 4 is connected to the bottom of the corrugated metal oil tank 1 via pipeline A9. The pressure sensor 2 at the oil tank end is close to the pipeline interface end of the corrugated metal oil tank 1, and the pressure sensor 6 at the transformer end is close to the pipeline interface end of the transformer 7.

[0031] The metal corrugated oil tank 1 of the embodiment is an inner oil type metal corrugated oil tank or an outer oil type metal corrugated oil tank, and the metal corrugated oil tank 1 is a vertical metal corrugated oil tank, that is, the extension direction of the corrugated core body in the metal corrugated oil tank 1 is a vertical direction perpendicular to a horizontal plane.

[0032] The balance oil tank 4 of the embodiment is made of a metal material (such as stainless steel).

[0033] The control module 8 of the embodiment is a prior art, which will not be described here.

[0034] The working principle of the utility model is as follows:

[0035] The metal corrugated oil tank 1 plays a basic oil storage role, the oil tank end pressure sensor 2 and the transformer end pressure sensor 6 play a role of monitoring the real-time oil pressure in the pipeline, the oil tank end pressure pump 3 and the transformer end pressure pump 5 are used for output work, the balance oil tank 4 is a fixed volume tank and plays a buffering role. The control module 8 is a component integrating sensor data acquisition and servo motor control, which is used for adjusting the pressure pump motor work according to the pressure change.

[0036] According to the specific construction drawing, the initial pressure P0 generated by the height difference between the ideal state of the transformer oil level and the oil tank oil level can be calculated according to the liquid pressure formula, and the direction is from the high oil level end to the low oil level end (the high and low oil levels are determined according to the relative arrangement height of the transformer 7 and the metal corrugated oil tank 1). After installation is completed and a certain amount of transformer insulating oil is injected, the control module 8 controls the servo motor above the oil tank end pressure pump 3 and the transformer end pressure pump 5 to work according to P0, generates a positive pressure at the high oil level end and a negative pressure at the low oil level end through the cooperation of pump displacement and pipe diameter, and offsets the initial pressure P0 generated by the height difference between the transformer oil level and the oil tank oil level through continuous work. At this time, the control module 8 reads the value recorded by the oil tank end pressure sensor 2 and the transformer end pressure sensor 6 as the original pressure value combination A. The whole system is in a pressure balance state.

[0037] When the transformer temperature changes, the expansion and contraction of the transformer insulating oil causes the oil level of the oil conservator to rise or fall, and the initial pressure P0 becomes P1, P2, P3, … The value changes of the oil conservator end pressure sensor 2 and the transformer end pressure sensor 6 are the pressure value combinations A1, A2, A3, … At this time, after the control module 8 reads the pressure value changes, the servo motor above the oil conservator end pressure pump 3 and the transformer end pressure pump 5 adjusts the rotating speed, and then adjusts the output power of the two pressure pumps. Through the cooperation of pump displacement and pipe diameter, the positive pressure at the high oil level end and the negative pressure at the low oil level end are generated, and the initial pressure P1 generated by the height difference between the transformer oil level and the oil conservator oil level is offset by continuous work. At this time, the control module 8 reads the value recorded by the oil conservator end pressure sensor 2 and the transformer end pressure sensor 6 as the self-pressure value combination A1, A2, A3, … changes to the original pressure value combination A. The whole system returns to the pressure balance state.

Claims

1. A floor-mounted pressure balancing structure for use in a substation system, comprising a corrugated metal oil conservator (1), characterized in that: It also includes a pressure balancing system. The corrugated metal oil tank (1) is a floor-mounted oil tank, that is, the corrugated metal oil tank (1) is installed on the ground (12). The pressure balancing system includes an oil tank end pressure sensor (2), an oil tank end pressure pump (3), a balancing oil tank (4), a transformer end pressure pump (5), and a transformer end pressure sensor (6). One interface of the balancing oil tank (4) is connected to the corrugated metal oil tank (1) through pipeline A (9). The oil tank end pressure sensor (2) and the oil tank end pressure pump (5) are respectively installed on the pipeline A (9). 3) The other interface of the balance oil tank (4) is connected to one end of the transformer end pressure pump (5) through pipeline B (10), and the other end of the transformer end pressure pump (5) is connected to the transformer (7) through pipeline C (11). A transformer end pressure sensor (6) is installed on pipeline C (11). A control module (8) is integrated on the metal corrugated oil tank (1). The oil tank end pressure sensor (2), oil tank end pressure pump (3), transformer end pressure pump (5) and transformer end pressure sensor (6) are respectively connected to the control module (8).

2. The floor-mounted pressure balancing structure for substation systems according to claim 1, characterized in that: The balance tank (4), pipeline B (10) and transformer end pressure pump (5) are located below the ground (12).

3. The floor-mounted pressure balancing structure for substation systems according to claim 1, characterized in that: The balance oil tank (4) is connected to the bottom of the metal corrugated oil tank (1) via pipeline A (9).

4. The floor-mounted pressure balancing structure for substation systems according to claim 1, characterized in that: The corrugated metal oil tank (1) is either an internal oil type corrugated metal oil tank or an external oil type corrugated metal oil tank.

5. The floor-mounted pressure balancing structure for substation systems according to claim 1, characterized in that: The corrugated metal oil tank (1) is a vertical corrugated metal oil tank, that is, the expansion and contraction direction of the corrugated core in the corrugated metal oil tank (1) is a vertical direction perpendicular to the horizontal plane.

6. The floor-mounted pressure balancing structure for substation systems according to claim 1, characterized in that: The pressure sensor (2) at the oil tank end is close to the pipeline interface end of the corrugated metal oil tank (1), and the pressure sensor (6) at the transformer end is close to the pipeline interface end of the transformer (7).

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