CN108988365B - External staggered connection method for three-phase balanced winding of high-capacity split-phase transformer - Google Patents
External staggered connection method for three-phase balanced winding of high-capacity split-phase transformer Download PDFInfo
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- CN108988365B CN108988365B CN201810827242.6A CN201810827242A CN108988365B CN 108988365 B CN108988365 B CN 108988365B CN 201810827242 A CN201810827242 A CN 201810827242A CN 108988365 B CN108988365 B CN 108988365B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
Compared with the prior art, the invention eliminates the damage to a balance winding supporting porcelain bottle caused by strong electromagnetic force generated at the moment of switching on the transformer, thoroughly solves the potential safety hazard brought to a power grid and users by unreasonable design and manufacture of the high-capacity transformer by transformer manufacturers, further improves the safe operation level of the high-capacity split-phase transformer, and saves greater economic loss for the power grid and the users, thereby realizing the purpose of the invention.
Description
Technical Field
The invention relates to a connection method, in particular to an external staggered connection method of a three-phase balance winding of a high-capacity split-phase transformer, which is suitable for a power grid and a user transformer substation.
Background
In the prior art, the three-phase balance winding of the large-capacity split-phase transformer mainly has the following connection methods.
1) A parallel hard connection method for three-phase balance windings of a high-capacity split-phase transformer is provided. When the transformer connection set is labeled Yyn0, when a three-phase sine wave voltage is applied to the high-voltage side, the magnetic flux in the core inevitably generates higher harmonic components, wherein the 3, 5, 7 and 9 harmonic components have the largest content, and the voltage output by the secondary side of the transformer is the non-sine wave voltage, which affects the quality of electric energy. Therefore, a transformer manufacturer optimally designs the high-capacity connection group label Yyn0 into a Yyn0+ d mode, at the moment of starting excitation of the transformer, the direction of a higher harmonic component (mainly 3 IV times) in the non-sinusoidal voltage of a balanced winding is the same in the three-phase winding at the same moment, and the triangular winding is a closed loop, so that the current of the higher harmonic component can flow in the winding connected in a triangular mode, and a large amount of higher harmonic magnetic flux (mainly 3 IV times) generated at the moment of power transmission is offset. The balance winding connection of the large-capacity split-phase transformer generally adopts a copper bar or cable parallel hard connection mode.
The disadvantages of this technique are: the large-capacity split-phase transformer generates large excitation inrush current in the no-load power transmission process, huge electromagnetic force generated by the excitation current flowing in and out of the balance winding is mutually superposed, and then the copper bars, the cables and the balance winding are connected and are all in hard connection, so that the electrodynamic force cannot be buffered and reduced, the porcelain bottle of the balance winding is easily pulled apart, and the safe and stable power supply of a power grid and users is influenced.
2) The three-phase balance winding of the high-capacity split-phase transformer is used for a working winding connection method. In order to avoid the influence on the quality of electric energy caused by the fact that harmonic current generated by the transformer cannot be eliminated when the transformer connecting set is numbered Yyn 0. A transformer manufacturer optimally designs a high-capacity split-phase transformer into a Yyn0+ d mode, and meanwhile, a balance winding is used for a working winding, so that the quality of electric energy is improved, and power can be supplied to a power grid or a user.
The disadvantages of this technique are: 1. when the high-capacity split-phase transformer is designed and assembled at the head ends of a power supply and distribution system and users, the voltage level of a balance winding needs to be matched with the voltage level of the system, so that the system configuration is not flexible.
2. When the transformer is used as a working winding, if the three phases of the grid voltage are unbalanced, the center point can be deviated, and in addition, the grounding transformer is assembled to stabilize the center point, the transformer generates extra electric energy loss, and the transformer is not economical.
3) The three-phase balance winding of the high-capacity split-phase transformer is used for a reactive power compensation and filtering connection method. In order to avoid the influence on the quality of electric energy caused by the fact that harmonic current generated by the transformer cannot be eliminated when the transformer connecting set is numbered Yyn 0. A transformer manufacturer optimally designs a high-capacity split-phase transformer into a Yyn0+ d mode, and meanwhile, the balance winding is connected with a reactive power compensation and filtering device in three phases, so that the electric energy quality and the power factor of a power grid are improved.
The disadvantages of this technique are: the large-capacity split-phase transformer occupies a large area and is assembled at the head end of user power supply or a power grid power supply pivot, and the connection mode and the layout are complex and uneconomical when the balance winding is connected with the reactive power compensation and filtering device.
Therefore, there is a need for an external staggered connection method for three-phase balance windings of a large-capacity split-phase transformer, which solves the above existing problems.
Disclosure of Invention
The invention aims to provide an external staggered connection method of a three-phase balance winding of a high-capacity split-phase transformer, aiming at the defects of the prior art, the connection mode of the three-phase balance winding of the high-capacity split-phase transformer is optimized in a power grid and users, the phenomenon that the porcelain bottle of the balance winding is pulled to crack due to the superposition of electrodynamic force and the incapability of offsetting larger excitation surge current generated by the capacity transformer during no-load power transmission is effectively avoided, the safe and stable power supply of the power grid and the users is influenced, and the huge technical problem that the porcelain bottle is frequently pulled to crack due to the electrodynamic force and the safe operation of equipment is influenced by the balance winding of the high-capacity split-phase transformer is solved.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the external staggered connection method for the three-phase balance winding of the high-capacity split-phase transformer is characterized by comprising the following steps of:
(1) measuring and determining the size and the number of three-phase connection copper plates of the balance winding of the high-capacity split-phase transformer;
(2) measuring and determining the sizes of a three-phase connection copper plate bracket and a support insulation porcelain bottle of a balanced winding of the high-capacity split-phase transformer;
(3) measuring and determining a large-capacity split-phase transformer balance winding body supporting insulating porcelain bottle and supporting porcelain bottle extension joint;
(4) measuring and determining the sizes of the soft connection and grounding down lead for external connection of the balance winding of the high-capacity split-phase transformer;
(5) determining the size and the quantity of the auxiliary materials, wherein the auxiliary materials comprise a busbar heat-shrinkable sleeve, a bus joint box, an outdoor two-piece rectangular bus fixing hardware (vertical type), a galvanized hexagon head bolt (full thread), a galvanized hexagon head through bolt (full thread) and a hexagon head copper bolt.
(6) Installing and fixing a large-capacity split-phase transformer balance winding external copper bar support, a support insulator and a copper plate, pouring and reinforcing concrete after a support foundation is fixed by using rivets, fixing a support insulator base and a support plate by using bolts, and fixing the copper plate and the support insulator by using a fixing hardware fitting after a thermal shrinkage sleeve is installed;
(7) installing a supporting insulator of a high-capacity split-phase transformer balance winding body, an insulator extension joint and a flexible connection, wherein a base seal must be made when the supporting insulator is installed, the extension joint is connected with an external copper plate through the flexible connection, and a bus insulation joint box must be installed at all joints after the connection is completed;
(8) and installing a large-capacity split-phase transformer balance winding grounding down lead, wherein the grounding down lead adopts a galvanized copper plate and must be installed at the copper bar outside the soft connection of the transformer balance winding.
In one embodiment of the invention, the magnitude of the magnetizing inrush current is calculated according to a high-capacity fractal type transformer, and the width, the thickness and the parallel connection number of the copper bars of the balance winding are selected; and determining the number of the required copper bars according to a large-capacity split-phase transformer plane layout and the body insulation support porcelain insulator elevation.
In one embodiment of the invention, the specific dislocation size of the balance winding inlet and outlet wire connecting copper bar is further determined after the width of the copper bar is determined, the balance winding inlet and outlet wire connecting copper bar must be completely dislocated, and a 1-2cm gap distance is reserved.
In one embodiment of the invention, the height of the supporting frame of the external wire inlet and outlet (copper bar) of the balance winding of the transformer and the height of the insulating supporting porcelain bottle of the external wire inlet and outlet (copper bar) are determined according to the elevation of the insulating supporting porcelain bottle of the balance winding body of the high-capacity split-phase transformer, the central line, the elevation of the foundation plane of the transformer, the width of the copper bar of the wire inlet and outlet of the balance winding and the dislocation height.
In one embodiment of the invention, the compensation height of the connector of the balance winding body insulation support porcelain bottle is determined according to the height of the balance winding body insulation support porcelain bottle, the width of the balance winding inlet and outlet wire copper bars and the dislocation height of the high-capacity split-phase transformer.
In one embodiment of the invention, the size of the flexible connection is determined according to the distance between the insulating support porcelain bottle of the balance winding body of the high-capacity split-phase transformer and the nearest balance winding bracket; and determining the height of the grounding downlead according to the height of the closest grounding electrode between the balance winding copper bar and the transformer.
In one embodiment of the invention, the balance winding inlet and outlet copper bar bracket, the transformer balance winding external support porcelain bottle, the flexible connection and the transformer balance winding body insulation support porcelain bottle compensation joint are manufactured according to the measurement sizes.
Compared with the prior art, the external staggered connection method of the three-phase balance winding of the high-capacity split-phase transformer eliminates the damage to the support porcelain insulator of the balance winding caused by strong electromagnetic force generated at the moment of switching on the transformer, thoroughly solves the potential safety hazard brought to a power grid and a user by unreasonable design and manufacture of the high-capacity transformer by a transformer manufacturer, further improves the safe operation level of the high-capacity split-phase transformer, saves greater economic loss for the power grid and the user, and achieves the purpose of the invention.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
Fig. 1 is a schematic structural diagram of an external staggered connection method for a three-phase balance winding of a large-capacity split-phase transformer according to the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Examples
As shown in FIG. 1, the external staggered connection method for the three-phase balance winding of the large-capacity split-phase transformer comprises the following steps:
1. measuring and determining the specification size and the number of the three-phase connection copper plates of the balance winding of the high-capacity split-phase transformer: cross-sectional dimensions: 125mm is multiplied by 10mm, oxygen-free copper is added, the total amount is 0.267 ton, 6 meters are required, 6 pieces are required, and the quality meets the GB/T5585.1-2005 standard.
2. The measurement confirms that large capacity phase-splitting transformer balance winding three-phase connects copper tablet support, support insulating vase specification and size and model: the support is a hollow steel pipe with the diameter of 100mm and the height of 2450mm, and the length and the width of a steel plate welded on the two sides of the steel pipe are 400 and 250 mm; the types of the supporting insulators are respectively as follows: ZSW40.5-GY height 560mm and ZSW72.5/4 height 760 mm.
3. The measurement confirms that the balanced winding body of large capacity split-phase transformer supports insulating vase, supports vase extension joint model and material: the product code number of the FBW-40.5/5000-4 manufacturer is as follows: TR1698 made of glass fiber reinforced plastics; height, width, thickness, 200, 125mm, 20, 6 phi 18.
4. Measuring and determining the specification size and the model of a flexible connection and a grounding down lead for external connection of a balance winding of the high-capacity split-phase transformer: the copper material adopts an oxygen-free copper strip, the thickness of a flexible connection copper strip foil is 0.2mm, and the total length of the flexible connection is as follows: 500mm, wherein the lap size: length: 100mm, 125mm wide and 20mm thick; overlap joint connecting hole two is located overlap joint mouth central authorities, the aperture: phi 12 mm; the overlapping contact surfaces require silver plating. The grounding down lead adopts a galvanized copper plate, and the length, the width and the thickness are 2950mm 8mm 5 mm.
5. Determining the specification size and the quantity of the used auxiliary materials: a busbar heat-shrinkable sleeve, 35kv 120mm x 4 and 20 meters; 20 bus bar connector boxes, 120 × 40 × 4 straight type, 20 120 × 30 × 4L type, and 20 120 × 30 × 4T type; outdoor two rectangular bus fixing hardware (vertical type), MWL-204, 35; galvanized hexagon head bolt (full thread), diameter: m14, length 80Mmm, 140 sets; galvanized hexagon head through bolt (full thread), diameter: m12, length 40Mmm, 140 sets; hexagon head copper bolt, diameter: m12, length 70Mmm 100 sleeve.
6. The large-capacity split-phase transformer balance winding external copper bar support, the supporting insulator and the copper plate are fixedly installed, the support foundation is fixed through rivets and then reinforced through concrete pouring, the supporting insulator base is fixed with the support supporting plate through bolts, and the copper plate is fixed with the supporting insulator through a fixing fitting after a thermal shrinkage sleeve is installed on the copper plate.
7. The method comprises the steps of installing a large-capacity split-phase transformer balance winding body supporting insulator, insulator extension joints and flexible connections, wherein a base must be well sealed when the supporting insulator is installed, the extension joints are connected with an external copper plate through the flexible connections, and bus insulation joint boxes must be installed at all joints after connection is completed.
8. The installation large capacity phase-splitting formula transformer balance winding ground connection downlead, the zinc-plated copper tablet of adoption is drawn to the ground connection downlead, and the ground connection downlead must be installed in transformer balance winding flexible coupling outside copper bar department, and the purpose is accessible flexible coupling buffering part electrodynamic force, reduces to the transformer body support vase atress.
The invention relates to an external staggered connection method of a three-phase balance winding of a high-capacity split-phase transformer, which is characterized in that a copper bar bracket is installed outside the balance winding of the high-capacity split-phase transformer, and a copper bar insulation supporting porcelain bottle is installed outside the balance winding on the bracket; installing a thermal shrinkage insulating sheath on the external connecting copper bars of the balance windings of all the high-capacity split-phase transformers, and starting to install the balance winding inlet and outlet copper bars which are firmly fixed by using a clamp after the installation is finished; installing a high-capacity split-phase transformer balance winding body insulation support porcelain bottle compensation joint; the compensation joint of the insulating support porcelain bottle of the high-capacity split-phase transformer balance winding body is butted with an external incoming and outgoing line copper bar; installing a large-capacity split-phase transformer balance winding grounding down lead, wherein only one point in a three-phase balance winding connecting loop can be grounded, a grounding point must be arranged on a phase B, and a connecting point with the balance winding must be selected at a position close to an external copper bar in flexible connection; installing a detachable insulating sheath at the joint part of the large-capacity split-phase transformer balance winding connecting loop, which cannot be subjected to thermal shrinkage installation of the insulating sheath; and after the installation is finished, testing the insulation resistance value of the large-capacity balance winding to be qualified, testing the direct current resistance value to be qualified, removing the safety measures of the transformer after the test is finished, and impacting, closing and transmitting power after the transformer is demagnetized.
According to the external staggered connection method of the three-phase balance winding of the high-capacity split-phase transformer, the parallel wiring mode of the balance winding of the transformer is changed into the staggered wiring mode, so that the repulsive force of magnetic fields applied to the copper bars entering and exiting can be reduced; the soft connection mounting part is changed to effectively weaken the traction force of the external copper plate through soft connection buffering and reduce the stress of the transformer body supporting porcelain insulator; and the connecting part of the grounding downlead is moved to the external copper bar of the flexible connection, so that the traction force of the grounding copper plate to the transformer body supporting porcelain bottle is reduced.
According to the external staggered connection method for the three-phase balanced winding of the high-capacity split-phase transformer, after the external parallel connection of the balanced winding of the high-capacity split-phase transformer is changed into a staggered connection mode, the traction effect of huge magnetic field force on the balanced winding body supporting porcelain bottle at the moment of switching on and power transmission of the high-capacity split-phase transformer is effectively weakened, and the purposes of protecting the porcelain bottle and ensuring safe operation of the transformer are achieved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (1)
1. The external staggered connection method for the three-phase balance winding of the high-capacity split-phase transformer is characterized by comprising the following steps of:
(1) measuring and determining the size and the number of three-phase connecting copper bars of the balance winding of the high-capacity split-phase transformer;
(2) measuring and determining the sizes of a three-phase connecting copper bar bracket and a supporting insulating porcelain bottle of the balanced winding of the high-capacity split-phase transformer;
(3) measuring and determining the type and size of a supporting insulating porcelain bottle and an extending joint of the supporting porcelain bottle of the high-capacity split-phase transformer balance winding body;
(4) measuring and determining the sizes of the soft connection and grounding down lead for external connection of the balance winding of the high-capacity split-phase transformer;
(5) determining the size and the number of auxiliary materials, wherein the auxiliary materials comprise a busbar heat-shrinkable sleeve, a bus joint box, an outdoor two-piece rectangular bus fixing hardware fitting, a galvanized hexagon head bolt, a galvanized hexagon head through bolt and a hexagon head copper bolt;
(6) installing and fixing a large-capacity split-phase transformer balance winding external copper bar bracket, a supporting insulator and a copper bar, pouring and reinforcing concrete after a bracket foundation is fixed by using rivets, fixing a supporting insulator base and a bracket supporting plate by using bolts, and fixing the copper bar and the supporting insulator by using a fixing fitting after a thermal shrinkage sleeve is installed on the copper bar;
(7) installing a supporting insulator of a high-capacity split-phase transformer balance winding body, an insulator extension joint and a flexible connection, wherein a base seal must be made when the supporting insulator is installed, the extension joint is connected with an external copper bar through the flexible connection, and a bus insulation joint box must be installed at all joints after the connection is completed;
(8) installing a large-capacity split-phase transformer balance winding grounding downlead, wherein the grounding downlead adopts a galvanized copper bar and must be installed at the copper bar outside the soft connection of the transformer balance winding;
calculating the magnitude of the magnetizing inrush current according to the high-capacity split-phase transformer, and selecting the width, the thickness and the parallel connection quantity of the copper bars of the balance winding; determining the number of copper bars according to a large-capacity split-phase transformer plane layout drawing and the body insulation support porcelain insulator elevation; after the width of the copper bar is determined, the specific dislocation size of the balance winding inlet and outlet wire connecting copper bar is further determined, the balance winding inlet and outlet wire connecting copper bar must be completely dislocated, and a 1-2cm gap distance is reserved; determining the height of an external wire inlet and outlet support frame and the height of an external wire inlet and outlet insulation support porcelain bottle of the transformer balance winding according to the elevation of the insulation support porcelain bottle of the balance winding body of the high-capacity split-phase transformer, the central line, the elevation of the transformer base plane, the width of the copper bar of the wire inlet and outlet of the balance winding and the dislocation height; determining the compensation height of the connector of the insulation support porcelain bottle of the balance winding body according to the height of the insulation support porcelain bottle of the balance winding body of the high-capacity split-phase transformer, the width of the copper bar of the incoming and outgoing lines of the balance winding and the dislocation height; determining the size of the flexible connection according to the distance between an insulating support porcelain bottle of a balance winding body of the high-capacity split-phase transformer and the nearest balance winding bracket; determining the height of the grounding downlead according to the height of the closest grounding electrode between the balance winding copper bar and the transformer; and manufacturing a balance winding inlet and outlet copper bar bracket, a transformer balance winding external support porcelain bottle, a flexible connection and a transformer balance winding body insulation support porcelain bottle compensation joint according to the measurement sizes.
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| CN201810827242.6A CN108988365B (en) | 2018-07-25 | 2018-07-25 | External staggered connection method for three-phase balanced winding of high-capacity split-phase transformer |
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| CN201810827242.6A CN108988365B (en) | 2018-07-25 | 2018-07-25 | External staggered connection method for three-phase balanced winding of high-capacity split-phase transformer |
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