CN109818337B - A new type of installation and fixation method for transformer DC bias suppression device - Google Patents

Abstract

The invention discloses a novel installation and fixing method of a transformer DC bias suppression device, which belongs to the field of DC bias suppression devices. A new type of installation and fixing method for the transformer DC bias suppression device. By establishing a power system model, there are three main reasons for the generation of DC bias; the geomagnetic current caused by the solar storm, the ground DC and The DC components generated by asymmetric loads are fully considered together to reduce the probability of DC bias magnetization from the source. Combined with several methods of suppressing DC bias magnetism, the economic and technical solutions for various methods of suppressing DC bias magnetism are calculated. The decision maker compares and selects the most suitable transformer equipment, and finally installs the transformer equipment.

Description

A new type of installation and fixation method for transformer DC bias suppression device

technical field

The invention relates to the field of DC bias suppression devices, in particular to a novel installation and fixation method for a DC bias suppression device of a transformer.

Background technique

DC bias refers to an abnormal working state of the transformer, which means that a DC component appears in the excitation current of the transformer. There are many reasons for the generation of DC bias, and solar magnetic storm is also one of them. DC bias will lead to problems such as increased temperature of the transformer, increased noise and increased vibration, which must be paid attention to during the operation of the transformer. In the process of HVDC transmission, there are two reasons for the generation of DC bias current. One is the geomagnetically induced current generated by the solar magnetic storm. The frequency of this geomagnetically induced current is very low. The frequency is 0.01-0.1Hz. Compared with the power frequency current, it can be treated as a quasi-DC current. Since there is a certain potential difference between each grounding point, this potential difference will cause a certain DC current to be injected into the transformer from the neutral line of the primary side of the transformer. These DC currents have a great impact on the operation of power transformers. For this reason, the influence of DC bias on the transformer needs to be calculated in advance when selecting a transformer. When the transformer generates DC bias, it will cause increased transformer noise, increased vibration, local overheating, increased transformer loss and other hazards.

The existing new installation and fixing method of the transformer DC bias suppression device cannot comprehensively consider the installation and selection of transformer equipment.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a new installation and fixation method of the transformer DC bias suppression device that can comprehensively consider the installation and selection of transformer equipment, and propose a novel installation and fixation method of the transformer DC bias suppression device.

In order to achieve the above object, the present invention adopts the following technical solutions:

A novel installation and fixation method for a transformer DC bias suppression device, comprising the following steps;

S1. Establish a power system model, and record the data of each section of the transformer station in the line to which the transformer DC bias suppression device belongs;

S2. According to the design requirements, collect the geographic information of the installation site of the transformer DC bias suppression device, and upload the design data of each item to the power system model;

S3. According to the geographic information of the installation site in S1, find out the historical records of solar storms in the region, take the largest solar storm values in the installation site over the years and import them into the power system model for calculation, and then judge in turn the surface potential gradient induced in the transformer windings. Influence of geomagnetically induced current on line operation;

S4. Select the potential difference of each grounding point of the circuit to which the transformer belongs, and select the same potential data to eliminate the DC or quasi-DC potential difference existing at different grounding points, and eliminate the DC bias caused by the DC or quasi-DC potential difference;

S5. Import the potential difference value selected in S3 into the power system model, and intercept the data of the current flowing in each section and substitute it into the calculation. Since the DC current flowing through each phase winding of the transformer increases to a certain value, It will cause magnetic saturation of the iron core, resulting in the distortion of the excitation current waveform, which will cause the DC bias of the transformer. Therefore, it is necessary to calculate the DC current of each transformer winding and estimate the ability of the transformer to withstand DC;

S6. According to the selection of different rated currents of the DC transmission grounding electrodes of the transformers selected in S3, substitute them into different methods of suppressing the DC bias, and list the main design parameters calculated by adopting various methods. This scheme is technically economical, and is applied to the comparative method to analyze the optimal method for suppressing DC bias;

S7. According to the calculated data, select a suitable method for suppressing DC bias and a transformer, and perform installation and testing.

Preferably, in the calculation of the DC current of each transformer winding in the S5, the following formula needs to be used for calculation;

In the formula: U _ab is the linear potential difference between the neutral points of the two transformers a and b; R _a and R _b are the transformer grounding resistances of the transformers a and b; R ₁ is the line between the two transformers a and b. resistance; i _ab is the DC current of each transformer winding.

Preferably, the ability of the transformer to withstand DC is estimated in S5, and the DC current of each transformer winding is selected according to the following conditions;

i _ab ≤2i _{no load}

In the formula: i no- _load is the excitation current under no-load state, i _ab is the DC current of each transformer winding.

Preferably, the method for suppressing the DC bias in the S6 includes the transformer neutral point series small resistance method, the AC transmission line series capacitor, the positive and negative potential compensation method, the improvement of the DC distribution in the power grid, the capacitor DC blocking method, the reducing The operating point of the transformer, the DC current reverse injection method and other methods, the technical economy of the various schemes in S6 includes various comparative conditions such as maintenance and operation cost, engineering cost, general type and so on.

A new type of installation and fixation device for a transformer DC bias suppression device is applied to a new type of installation and fixation method for a transformer DC bias suppression device. The four corners are provided with slide rails, the bottom of the buffer seat is slidably connected with the slide rails, the middle of the four sides of the base is provided with installation grooves, the dust removal grille is fixedly installed in the installation grooves, and the inner center of the base is A dust suction chamber is provided, a dust suction pipe is fixedly connected between the dust suction chamber and the dust removal grille, the suction device is fixedly installed inside the dust suction chamber, and a motor is fixedly installed inside the base , the output shaft of the motor is movably connected with the suction device, and the four corners of the bottom surface of the base are fixedly installed with fixed feet.

Preferably, the buffer seat comprises a threaded rod, an upper fixing plate, a lower fixing plate and a buffer spring, the bottom end of the threaded rod is fixedly connected with a slider, the slider is matched with the sliding rail, the The bottom of the threaded rod is threadedly connected with a lower fixing plate, the middle and upper part of the threaded rod is movably sleeved with an upper fixing plate, the buffer spring is movably installed between the lower fixing plate and the upper fixing plate, and the center of the buffer spring is the same as the upper fixing plate. The threaded rods overlap, the upper end of the threaded rod is threadedly connected to a limit block, the limit block is located above the upper fixing plate, and the outer surface of the limit block is evenly provided with gear grooves. Bias causes vibrations.

Preferably, the suction device includes a gear ring, blades and a dust collecting tank, a ventilation grille is fixedly installed at the bottom of the dust suction cavity, and a fixing seat is fixedly installed at the bottom center of the ventilation grille, so The upper end of the fixed seat is movably sleeved with a rotating shaft, the upper outer surface of the rotating shaft is fixedly connected with the center of the blade, the outer ring of the blade is fixedly connected with the inner ring of the gear ring, and the output of the motor The shaft is fixedly installed with a linkage gear, the linkage gear is meshed with the outer ring of the gear ring, the upper opening of the dust collector is threadedly connected to the bottom of the ventilation grille, and the suction device can suck the dust near the transformer. , to avoid dust adsorption on the transformer.

Preferably, a cloth bag layer is fixedly installed on the upper surface of the ventilation grill, a scraper is fixedly connected to the bottom outer surface of the rotating shaft, and the outer bottom surface of the scraper is in contact with the upper surface of the cloth bag layer. , the bag layer and the scraper can intercept the dust and guide it into the interior of the dust collector.

Compared with the prior art, the present invention provides a novel installation and fixing method for the transformer DC bias suppression device, which has the following beneficial effects:

1. The new installation and fixing method of the DC bias suppression device of the transformer. There are three main reasons for the DC bias: the geomagnetic current caused by the solar storm, the ground DC generated by the operation of the DC transmission single pole and the DC generated by the asymmetric load. By establishing a power system model, in the AC network, the different DC or quasi-DC potential differences in the line to which the substation belongs can be controlled within a certain range, and the DC offset caused by the DC component generated by the asymmetric load can be suppressed. Magnetic, collect the geographic information of the transformer installation site in advance, and simulate the size of the maximum geomagnetic current caused by the solar storm. The DC bias is controlled within the operable range, and the ground DC generated by the operation of the DC transmission unipolar loop in the circuit is simulated in the power system model, and by changing the potential size of the substation point, the grounding resistance of the substation and the winding of the substation Factors such as the size of the DC resistance can reduce the DC in the ground generated by the operation of the DC transmission unipolar loop in the circuit.

2. The new installation and fixing method of the transformer DC bias suppression device, because the methods for suppressing DC bias include the transformer neutral point series small resistance method, the AC transmission line series capacitor, the positive and negative potential compensation method, the improvement of the DC distribution in the power grid, Capacitor DC blocking method, reducing the operating point of the transformer, DC current reverse injection method and other methods need to substitute the data calculated in the power system model into different methods in advance to find out the required technology in various schemes According to the actual production needs and the technical and economical combination of various schemes, the optimal scheme can be found.

3. The transformer DC bias suppression device is a new type of installation and fixture, because the transformer will generate moving vibration and noise during operation, and the vibration and noise will increase when it is subjected to DC bias. In order to slow down the vibration of the transformer Therefore, a buffer type base is designed. During the installation process, the four corners of the bottom of the transformer need to be fixedly installed on the buffer seat. The buffer seat and the base are connected by the slider and the slide rail, so that the base can be suitable for different sizes. The outer surface of the limit block is provided with a gear groove, which is convenient to adjust the position of the limit block on the threaded rod up and down, thereby limiting the contraction range of the buffer spring. The weight of the transformer itself will compress the buffer spring. When the transformer vibrates , the buffer springs at the four corners of the base will absorb part of the vibration, thereby reducing noise.

4. The transformer DC bias suppression device is a new type of installation and fixing device. Due to the inevitable or dust entry in the substation, when the transformer vibrates, the base will vibrate together. Because the transformer is large and heavy, it is easy to remove the dust on the ground. When the dust is lifted, the fine dust is easily adsorbed to the outer surface of the transformer, so by setting the suction device, the dust removal grille is located at a lower position, close to the bottom surface. Negative air pressure is generated in the cavity, and the dust will enter into the vacuum chamber through the dust collector through the vacuum pipe. When the motor works, the gear ring rotates, and the gear ring drives the internal blades to rotate to form a negative pressure, and the dust enters the vacuum chamber. After the inside, a certain pressure difference will also be formed near the ventilation grille, and the dust will be adsorbed to the cloth bag layer under the dual action of the pressure difference and gravity, and finally fall into the dust collecting tank, and the dust is easy to accumulate for a long time. The bag layer is sealed. For this reason, a scraper is fixedly installed on the bottom outer surface of the rotating shaft. During the rotation of the scraper, the dust on the upper surface of the cloth bag layer will be scraped and dropped into the dust collecting tank. The ventilation grilles are connected by threads, which is convenient for the installation and removal of the dust collecting tank. Through the above arrangement, the device can have the function of dust removal.

The parts not involved in the device are the same as the existing technology or can be realized by using the existing technology. The present invention establishes a power system model, and there are three main reasons for the generation of DC bias; The DC components in the ground generated by the operation of the large loop and the DC components generated by asymmetric loads are fully considered together to reduce the probability of DC bias magnetization from the source. Combined with several methods of suppressing DC bias magnetization, various DC bias suppression methods are calculated. The economic and technical scheme of the bias magnetization method is for decision makers to compare and select the most suitable transformer equipment, and finally install and operate the transformer equipment.

Description of drawings

1 is a schematic structural diagram of a new type of installation and fixing device for a transformer DC bias suppression device proposed by the present invention;

2 is a schematic structural diagram of a buffer seat in a new type of installation and fixing device for a transformer DC bias suppression device proposed by the present invention;

3 is a cross-sectional view of a novel installation and fixing device of a transformer DC bias suppression device proposed by the present invention;

4 is a schematic diagram of the connection of a gear ring in a new type of installation and fixing device of a transformer DC bias suppression device proposed by the present invention;

5 is a schematic diagram of the connection of a gear ring in a new type of installation and fixing device of a transformer DC bias suppression device proposed by the present invention;

6 is a cross-sectional view of a suction device in a new type of installation and fixing device of a transformer DC bias suppression device proposed by the present invention;

FIG. 7 is a partial enlarged view of A in FIG. 6 .

In the figure: 1. Base; 2. Slide rail; 3. Buffer seat; 4. Installation slot; 5. Dust removal grille; 6. Fixed foot; 7. Threaded rod; 8. Upper fixing plate; 9. Lower fixing plate; 10, slider; 11, buffer spring; 12, limit block; 13, suction pipe; 14, suction chamber; 15, suction device; 16, motor; 17, gear ring; 18, blade; 19, linkage Gear; 20, rotating shaft; 21, ventilation grille; 22, fixed seat; 23, dust collecting tank; 24, scraper; 25, cloth bag layer.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", " The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, so as to The specific orientation configuration and operation are therefore not to be construed as limitations of the present invention.

Specific implementation cases:

Embodiment 1: a novel installation and fixation method for a transformer DC bias suppression device, comprising the following steps;

S1. Establish a power system model, and record the data of each section of the transformer station in the line to which the transformer DC bias suppression device belongs;

S2. According to the design requirements, collect the geographic information of the installation site of the transformer DC bias suppression device, and upload the design data of each item to the power system model;

S3. According to the geographic information of the installation site in S1, find out the historical records of solar storms in the region, take the largest solar storm values in the installation site over the years and import them into the power system model for calculation, and then judge in turn the surface potential gradient induced in the transformer windings. Influence of geomagnetically induced current on line operation;

S4. Select the potential difference of each grounding point of the circuit to which the transformer belongs, and select the same potential data to eliminate the DC or quasi-DC potential difference existing at different grounding points, and eliminate the DC bias caused by the DC or quasi-DC potential difference;

S5. Import the potential difference value selected in S3 into the power system model, and intercept the data of the current flowing in each section and substitute it into the calculation. Since the DC current flowing through each phase winding of the transformer increases to a certain value, It will cause magnetic saturation of the iron core, resulting in the distortion of the excitation current waveform, which will cause the DC bias of the transformer. Therefore, it is necessary to calculate the DC current of each transformer winding and estimate the ability of the transformer to withstand DC;

S6. According to the selection of different rated currents of the DC transmission grounding electrodes of the transformers selected in S3, substitute them into different methods of suppressing the DC bias, and list the main design parameters calculated by adopting various methods. This scheme is technically economical, and is applied to the comparative method to analyze the optimal method for suppressing DC bias;

S7. According to the calculated data, select a suitable method for suppressing DC bias and a transformer, and perform installation and testing.

The new installation and fixing method of the DC bias suppression device of the transformer, there are three main reasons for the DC bias: the geomagnetic current caused by the solar storm, the DC component in the ground generated by the operation of the DC transmission single pole and the DC component generated by the asymmetric load, By establishing a power system model, in the AC network, the different DC or quasi-DC potential differences in the line to which the substation belongs can be controlled within a certain range, and the DC bias generated by the DC component generated by the asymmetric load can be suppressed. Collect the geographic information of the installation site of the transformer in advance, and simulate the size of the maximum geomagnetic current caused by the solar storm. The bias control is within the operable range, in the power system model, the ground DC generated by the operation of the DC transmission single pole loop in the circuit is simulated, and by changing the potential size of the point where the substation is located, the grounding resistance of the substation and the DC resistance of the substation windings The size and other factors reduce the DC in the ground generated by the operation of the DC transmission single pole in the circuit.

Embodiment 2: Referring to FIG. 5, the difference in combination with the foundation of Embodiment 1 is that, in a new installation and fixing method of the transformer DC bias suppression device, the following formula is required to calculate the DC current of each transformer winding in S5. Calculation;

In the formula: Uab is the linear potential difference between the neutral points of the two transformers a and b; R _a and R _b are the transformer grounding resistances of the transformers a and b; R ₁ is the line between the two transformers a and b. resistance; i _ab is the DC current of each transformer winding.

In S5, the ability of the transformer to withstand DC is estimated, and the DC current of each transformer winding is selected according to the following conditions;

i _ab ≤2i _{no load}

In the formula: i no- _load is the excitation current under no-load state, i _ab is the DC current of each transformer winding.

The methods for suppressing the DC bias in S6 include the transformer neutral point series small resistance method, the AC transmission line series capacitor, the positive and negative potential compensation method, the improvement of the DC distribution in the power grid, the capacitor DC blocking method, the reduction of the operating point of the transformer, DC current reverse injection method and other methods, the technical economy of various schemes in S6 includes various comparative conditions such as maintenance and operation cost, project cost, general type and so on.

The new installation and fixing method of the transformer DC bias suppression device, because the methods for suppressing DC bias include the transformer neutral point series small resistance method, the AC transmission line series capacitor, the positive and negative potential compensation method, the improvement of the DC distribution in the power grid, the capacitor isolation method Direct method, reducing the operating point of the transformer, DC current reverse injection method and other methods, it is necessary to substitute the data calculated in the power system model into different methods in advance to obtain the required technical solutions in various solutions. According to the actual production needs and combined with various technical and economical solutions, the optimal solution can be found.

Embodiment 3: A new type of installation and fixation device for a transformer DC bias suppression device, applied to a new type of installation and fixation method for a transformer DC bias suppression device, including a base 1 and a buffer seat 3, and also includes a dust removal grill 5 and a suction device 15. The four corners of the upper surface of the base 1 are provided with slide rails 2, the bottom of the buffer seat 3 is slidably connected with the slide rail 2, the middle of the four sides of the base 1 is provided with a mounting groove 4, and the dust removal grille 5 is fixedly installed in the mounting groove 4, and the base 1 A dust suction chamber 14 is arranged in the center of the interior. A dust suction pipe 13 is fixedly connected between the dust suction chamber 14 and the dust removal grille 5. 16. The output shaft of the motor 16 is movably connected to the suction device 15, and the four corners of the bottom surface of the base 1 are fixedly installed with fixed feet 6.

The buffer seat 3 includes a threaded rod 7, an upper fixed plate 8, a lower fixed plate 9 and a buffer spring 11. The bottom end of the threaded rod 7 is fixedly connected with a slider 10, the slider 10 is matched with the slide rail 2, and the bottom of the threaded rod 7 The lower fixing plate 9 is threadedly connected, the upper fixing plate 8 is movably sleeved on the middle and upper part of the threaded rod 7, the buffer spring 11 is movably installed between the lower fixing plate 9 and the upper fixing plate 8, and the center of the buffer spring 11 coincides with the threaded rod 7 , the upper end of the threaded rod 7 is threadedly connected to the limit block 12, the limit block 12 is located above the upper fixed plate 8 and the outer surface of the limit block 12 is evenly provided with gear grooves.

The transformer DC bias suppression device is a new type of installation and fixing device. Since the transformer will generate moving vibration and noise during operation, and the vibration and noise will increase when it is subjected to DC bias, in order to slow down the transformer vibration, so The buffer base 1 is designed. During the installation process, the four corners of the bottom of the transformer need to be fixedly installed on the buffer base 3. The buffer base 3 and the base 1 are connected by the slider 10 and the slide rail 2, so that the base 1 It can be applied to transformers of different sizes. The outer surface of the limit block 12 is provided with a gear groove, which is convenient to adjust the position of the limit block 12 on the threaded rod 7 up and down, thereby limiting the contraction range of the buffer spring 11, and the weight of the transformer itself will be reduced. The buffer spring 11 will be compressed. When the transformer vibrates, the buffer springs 11 at the four corners of the base 1 will absorb a part of the vibration, thereby reducing noise.

Embodiment 4: A new type of installation and fixing device for the transformer DC bias suppression device. The suction device 15 includes a gear ring 17, a blade 18 and a dust collecting tank 23. The bottom of the dust suction chamber 14 is fixedly installed with a ventilation grille 21. The ventilation grid The bottom center of the grid 21 is fixedly installed with a fixed seat 22, the upper end of the fixed seat 22 is movably sleeved with a rotating shaft 20, the upper outer surface of the rotating shaft 20 is fixedly connected with the center of the blade 18, and the outer ring of the blade 18 is connected with the inner ring of the gear ring 17. The ring is fixedly connected, the output shaft of the motor 16 is fixedly installed with a linkage gear 19, and the linkage gear 19 is engaged with the outer ring of the gear ring 17.

A cloth bag layer 25 is fixedly installed on the upper surface of the ventilation grille 21 , and a scraper 24 is fixedly connected to the bottom outer surface of the rotating shaft 20 .

This new type of installation and fixture of the transformer DC bias suppression device, due to the inevitable or dust entry in the substation, when the transformer vibrates, it drives the base 1 to vibrate together. Because the transformer is large and heavy, it is easy to carry the dust on the ground. Therefore, by setting the suction device 15, the dust removal grille 5 is located at a lower position and is close to the bottom surface. When the dust on the ground is raised, the suction device 15 is used to make it work. Negative air pressure is generated in the dust suction chamber 14, and the dust will enter the dust suction chamber 14 through the dust removal grille 5 through the dust suction pipe 13. When the motor 16 is working, the gear ring 17 is driven to rotate, and the gear ring 17 drives the inner blade 18 to rotate. Negative air pressure is formed. After the dust enters the vacuum chamber 14, a certain pressure difference will also be formed near the ventilation grille 21, and the dust will be adsorbed on the cloth bag layer 25 under the dual action of the pressure difference and gravity, and finally fall off. Falling into the dust collecting tank 23, the accumulation of dust for a long time will easily seal the bag layer 25. For this reason, a scraper 24 is fixedly installed on the bottom outer surface of the rotating shaft 20, and the scraper 24 will scrape during the rotation. The dust on the upper surface of the cloth bag layer 25 falls into the dust collecting tank 23, and the dust collecting tank 23 and the ventilation grille 21 are connected by threads, which is convenient for the installation and disassembly of the dust collecting tank 23. Through the above settings, the device can have Dust removal function.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (7)

1. a novel installation and fixation method for a transformer DC bias suppression device, characterized in that: comprising the following steps; S1. Establish a power system model, and record the data of each section of the transformer station in the line to which the transformer DC bias suppression device belongs; S2. According to the design requirements, collect the geographic information of the installation site of the transformer DC bias suppression device, and upload the design data of each item to the power system model; S3. According to the geographic information of the installation site in S1, find out the historical records of solar storms in the region, take the largest solar storm values in the installation site over the years and import them into the power system model for calculation, and then judge in turn the surface potential gradient induced in the transformer windings. Influence of geomagnetically induced current on line operation; S4. Select the potential difference of each grounding point of the circuit to which the transformer belongs, and select the same potential data to eliminate the DC or quasi-DC potential difference existing at different grounding points, and eliminate the DC bias caused by the DC or quasi-DC potential difference; S5. Import the potential difference value selected in S3 into the power system model, and intercept the data of the current flowing in each section and substitute it into the calculation. Since the DC current flowing through each phase winding of the transformer increases to a certain value, It will cause magnetic saturation of the iron core, resulting in the distortion of the excitation current waveform, which will cause the DC bias of the transformer. Therefore, it is necessary to calculate the DC current of each transformer winding and estimate the ability of the transformer to withstand DC; S6. According to the selection of different rated currents of the DC transmission grounding electrodes of the transformers selected in S3, substitute them into different methods of suppressing the DC bias, and list the main design parameters calculated by adopting various methods. This scheme is technically economical, and is applied to the comparative method to analyze the optimal method for suppressing DC bias; The method for suppressing the DC bias includes the transformer neutral point series small resistance method, the AC transmission line series capacitor, the positive and negative potential compensation method, the improvement of the DC distribution in the power grid, the capacitor DC blocking method, the reduction of the operating point of the transformer, DC current reverse injection method, the technical and economical aspects of the various solutions include maintenance and operation costs, engineering costs, and general-purpose comparison conditions; S7. According to the calculated data, select an appropriate method and transformer for suppressing DC bias, and perform installation and testing. 2. the novel installation and fixing method of a kind of transformer DC bias suppression device according to claim 1, is characterized in that: in the described S5, in calculating the DC current of each transformer winding, the following formula needs to be used to calculate;

In the formula: U _ab is the linear potential difference between the neutral points of the two transformers a and b; R _a and R _b are the transformer grounding resistances of the transformers a and b; R ₁ is the line between the two transformers a and b. Phase resistance; i _ab is the DC current of each transformer winding. 3. a kind of novel installation and fixing method of transformer DC bias suppression device according to claim 1, is characterized in that: in described S5, the ability of estimating transformer to withstand DC is to satisfy the following conditions with the DC current of each transformer winding select; i _ab ≤2i _{no load} In the formula: i no- _load is the excitation current under no-load state, i _ab is the DC current of each transformer winding. 4. A new type of installation and fixation device for a transformer DC bias suppression device, applied to a new type of installation and fixation method for a transformer DC bias suppression device described in claim 1, comprising a base (1) and a buffer seat (3), which The utility model is characterized in that: it also includes a dust removal grill (5) and a suction device (15), the four corners of the upper surface of the base (1) are provided with slide rails (2), and the bottom of the buffer seat (3) is connected to the slide rails (2). The rails (2) are slidably connected, the middle of the four sides of the base (1) is provided with an installation groove (4), the dust removal grille (5) is fixedly installed in the installation groove (4), and the base (1) A dust suction chamber (14) is arranged in the center of the interior, a dust suction pipe (13) is fixedly connected between the dust suction chamber (14) and the dust removal grille (5), and the suction device (15) is fixedly installed Inside the dust suction chamber (14), a motor (16) is fixedly installed inside the base (1), and the output shaft of the motor (16) is movably connected with the suction device (15). The four corners of the bottom surface of the base (1) are fixedly mounted with fixing feet (6). 5. A new type of installation and fixing device for a transformer DC bias suppression device according to claim 4, characterized in that: the buffer seat (3) comprises a threaded rod (7), an upper fixing plate (8), a lower fixing A plate (9) and a buffer spring (11), the bottom end of the threaded rod (7) is fixedly connected with a slider (10), the slider (10) is matched with the slide rail (2), the The bottom of the threaded rod (7) is threadedly connected with a lower fixing plate (9), the middle and upper part of the threaded rod (7) is movably sleeved with an upper fixing plate (8), and the buffer spring (11) is movably installed Between the lower fixing plate (9) and the upper fixing plate (8) and the center of the buffer spring (11) coincides with the threaded rod (7), the upper end of the threaded rod (7) is threadedly connected to the limit block (12), The limiting block (12) is located above the upper fixing plate (8) and the outer surface of the limiting block (12) is evenly provided with gear grooves. 6. A new type of installation and fixing device for a transformer DC bias suppression device according to claim 4, characterized in that: the suction device (15) comprises a gear ring (17), a blade (18) and a dust collecting tank (23), a ventilation grille (21) is fixedly installed at the bottom of the dust suction chamber (14), and a fixing seat (22) is fixedly installed at the bottom center of the ventilation grille (21). The upper end of the seat (22) is movably sleeved with a rotating shaft (20), the upper outer surface of the rotating shaft (20) is fixedly connected with the center of the blade (18), and the outer ring of the blade (18) is connected to the gear ring The inner ring of (17) is fixedly connected, the output shaft of the motor (16) is fixedly installed with a linkage gear (19), and the linkage gear (19) is meshed with the outer ring of the gear ring (17). The opening of the upper end of the dust collecting tank (23) is threadedly connected with the bottom of the ventilation grille (21). 7. A new type of installation and fixing device for a transformer DC bias suppression device according to claim 6, characterized in that: a cloth bag layer (25) is fixedly installed on the upper surface of the ventilation grille (21), and the A scraper (24) is fixedly connected to the bottom outer surface of the rotating shaft (20), and the outer bottom surface of the scraper (24) is in contact with the upper surface of the cloth bag layer (25).

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