CN107273614B - Method for calculating stress of 220kV transformer winding under short-circuit power - Google Patents
Method for calculating stress of 220kV transformer winding under short-circuit power Download PDFInfo
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- CN107273614B CN107273614B CN201710453017.6A CN201710453017A CN107273614B CN 107273614 B CN107273614 B CN 107273614B CN 201710453017 A CN201710453017 A CN 201710453017A CN 107273614 B CN107273614 B CN 107273614B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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Abstract
The embodiment of the invention discloses a method for calculating stress of a 220kV transformer winding when short-circuit power is applied to the winding. And then, under the condition of applying transient current, carrying out thinning and partitioning on the model of the weak part aiming at the weak parts to obtain a stress curve of the parts changing along with time. The embodiment of the invention also discloses a device for calculating the stress of the 220kV transformer winding when short-circuit power is applied.
Description
Technical Field
The invention relates to the field of 220kV transformer windings, in particular to a stress calculation method for a 220kV transformer winding subjected to short-circuit power.
Background
The electrodynamic force on the winding of the transformer is generated by the interaction of the short-circuit current and the leakage magnetic field, and is larger than normal conditions due to the fact that the short-circuit current in the winding is large during short circuit, and the electrodynamic force on the winding is in direct proportion to the square of the short-circuit current. Although the transient process duration of the short circuit is short, the short circuit of the transformer can be seriously damaged if the short circuit strength is not enough.
At present, an MAXWELL module in ANSYS workbench15.0 finite element analysis software is used for simulating an electromagnetic field of a transformer, leakage magnetic field distribution inside the transformer is simulated on the basis of establishing a multi-physical-field coupling model of the transformer and under the condition that fitted short-circuit current is used as transformer winding excitation, and then electromagnetic force density calculated by MAXWELL is coupled into a structural module of the transformer, so that transient stress analysis of the transformer under different short-circuit conditions is obtained.
When the transient stress analysis is performed on the transformer winding, a stress curve of each position of the winding changing along with time cannot be made, so that the method and the device for calculating the stress of the 220kV transformer winding, which can obtain the stress curve of each position of the winding changing along with time when the 220kV transformer winding is subjected to short-circuit power, are provided, and the technical problems to be solved by the technical personnel in the field.
Disclosure of Invention
The embodiment of the invention provides a method and a device for calculating the stress of a 220kV transformer winding when short-circuit power is applied to the winding, and lays a foundation for carrying out multi-physical-field coupling numerical simulation on the transformer.
The embodiment of the invention provides a method for calculating stress of a 220kV transformer winding when short-circuit power is applied to the winding, which comprises the following steps:
s1: establishing a transformer model, and equally dividing a high-voltage winding, a medium-voltage winding and a low-voltage winding of the transformer model into ten subareas;
s2: establishing a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding and the low-voltage winding, and establishing a turn of coil for the seventh partition of the high-voltage winding, the medium-voltage winding and the low-voltage winding to obtain a transformer model after the coils are established;
s3: carrying out first short-circuit experiment simulation operation on the transformer model after the coil is established under a preset first condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding;
s4: and carrying out second short-circuit experiment simulation operation on the transformer model after the coil is established under a preset second condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding.
Preferably, the step S3 specifically includes:
after the medium-voltage winding is in short circuit and the low-voltage winding is in open circuit, a preset first short-circuit current is applied to the high-voltage winding, and a preset second short-circuit current is applied to the medium-voltage winding after short circuit, so that the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding are obtained.
Preferably, the step S4 specifically includes:
after the medium-voltage winding is opened and the low-voltage winding is short-circuited, a preset third short-circuit current is applied to the high-voltage winding, and a preset fourth short-circuit current is applied to the short-circuited low-voltage winding, so that the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding are obtained.
Preferably, the step S1 is followed by:
after the medium-voltage winding is opened, 2927A of short-circuit current is applied to the high-voltage winding and 33803.9A of short-circuit current is applied to the low-voltage winding, the resultant force received by each partition winding of the transformer model is calculated, and a resultant force curve received by the high-voltage winding, a resultant force curve received by the medium-voltage winding and a resultant force curve received by the low-voltage winding are obtained.
Preferably, an embodiment of the present invention further provides a device for calculating a stress when a 220kV transformer winding is subjected to short-circuit power, including:
the transformer modeling device comprises a first building unit, a second building unit and a third building unit, wherein the first building unit is used for building a transformer model and equally dividing a high-voltage winding, a medium-voltage winding and a low-voltage winding of the transformer model into ten subareas;
the second establishing unit is used for establishing a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding and the low-voltage winding, and establishing a turn of coil for the seventh partition of the high-voltage winding, the medium-voltage winding and the low-voltage winding to obtain a transformer model after the coils are established;
the first short-circuit unit is used for carrying out first short-circuit experiment simulation operation on the transformer model after the coil is established under a preset first condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding;
and the second short-circuit unit is used for carrying out second short-circuit experiment simulation operation on the transformer model after the coil is established under a preset second condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding.
Preferably, the first short-circuit unit is further configured to apply a preset first short-circuit current to the high-voltage winding after the medium-voltage winding is short-circuited and the low-voltage winding is open-circuited, and apply a preset second short-circuit current to the medium-voltage winding after the short-circuit, so as to obtain a transient stress condition of a top coil of the high-voltage winding, a transient stress condition of a seventh segment coil of the high-voltage winding, a transient stress condition of a top coil of the medium-voltage winding, and a transient stress condition of a seventh segment coil of the medium-voltage winding.
Preferably, the second short-circuit unit is further configured to apply a preset third short-circuit current to the high-voltage winding after the medium-voltage winding is opened and the low-voltage winding is short-circuited, and apply a preset fourth short-circuit current to the short-circuited low-voltage winding, so as to obtain a transient stress condition of a top coil of the high-voltage winding, a transient stress condition of a seventh segment coil of the high-voltage winding, a transient stress condition of a top coil of the low-voltage winding, and a transient stress condition of a seventh segment coil of the low-voltage winding.
Preferably, the device for calculating the stress when the 220kV transformer winding receives the short-circuit power provided by the embodiment of the invention further comprises:
and the third short-circuit unit is used for calculating the resultant force received by each partition winding of the transformer model after the medium-voltage winding is opened, 2927A short-circuit current is applied to the high-voltage winding and 33803.9A short-circuit current is applied to the low-voltage winding, and obtaining a resultant force curve received by the high-voltage winding, a resultant force curve received by the medium-voltage winding and a resultant force curve received by the low-voltage winding.
According to the technical scheme, the embodiment of the invention has the following advantages:
the embodiment of the invention provides a method and a device for calculating the stress of a 220kV transformer winding when short-circuit power is applied to the winding, wherein the method for calculating the stress of the 220kV transformer winding when short-circuit power is applied to the winding comprises the following steps: s1: establishing a transformer model, and equally dividing a high-voltage winding, a medium-voltage winding and a low-voltage winding of the transformer model into ten subareas; s2: establishing a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding and the low-voltage winding, and establishing a turn of coil for the seventh partition of the high-voltage winding, the medium-voltage winding and the low-voltage winding to obtain a transformer model after the coils are established; s3: carrying out first short-circuit experiment simulation operation on the transformer model after the coil is established under a preset first condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding; s4: and carrying out second short-circuit experiment simulation operation on the transformer model after the coil is established under a preset second condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding. The embodiment of the invention provides a method and a device for calculating the stress of a 220kV transformer winding when short-circuit power is applied to the winding, and lays a foundation for carrying out multi-physical-field coupling numerical simulation on the transformer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a method for calculating stress when a 220kV transformer winding is subjected to short-circuit power according to an embodiment of the present invention;
fig. 2 is another schematic flow chart of a method for calculating stress when a 220kV transformer winding is subjected to short-circuit power according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a stress calculating device for a 220kV transformer winding subjected to short-circuit power according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a transformer model;
FIG. 5 is a diagram illustrating the resultant radial force experienced by the high voltage winding;
FIG. 6 is a diagram illustrating the resultant radial force experienced by the low voltage winding;
FIG. 7 is a schematic diagram of the resulting axial forces experienced by the high voltage winding;
FIG. 8 is a schematic diagram of the resulting axial forces experienced by the low voltage winding;
FIG. 9 is a schematic diagram of a partially refined three-dimensional transformer model;
FIG. 10 is a schematic diagram of the short circuit current of the high voltage winding for a high-medium short circuit experiment;
FIG. 11 is a schematic diagram of the short circuit current of the medium voltage winding for a high-medium short circuit experiment;
FIG. 12 is a radial transient stress waveform of a coil at the upper end of a high-voltage winding in a high-medium short-circuit experiment;
FIG. 13 is a waveform diagram of an axial transient stress of a coil at the upper end of a high-voltage winding in a high-medium short-circuit experiment;
FIG. 14 is a radial transient stress waveform of the coil at the upper end of the medium voltage winding in the high-medium short circuit test;
FIG. 15 is a waveform diagram of an axial transient stress of a coil at the upper end of a medium voltage winding in a high-medium short circuit test;
FIG. 16 is a radial transient stress waveform of a seventh coil segment of a high-voltage winding in a high-medium short-circuit experiment;
FIG. 17 is a waveform diagram of an axial transient stress of a seventh coil segment of a high-voltage winding in a high-medium short-circuit test;
FIG. 18 is a radial transient stress waveform of a seventh coil segment of a medium voltage winding in a high-medium short circuit experiment;
FIG. 19 is a waveform of an axial transient stress of a seventh coil segment of a medium voltage winding in a high-medium short circuit test;
FIG. 20 is a schematic diagram of the short circuit current of the high voltage winding for a high-low short circuit test;
FIG. 21 is a schematic diagram of the short circuit current of the low voltage winding for a high-low short circuit test;
FIG. 22 is a radial transient stress waveform diagram of coils at the upper end of a high-voltage winding in a high-low short-circuit experiment
FIG. 23 is a waveform diagram of axial transient stress of coils at the upper end of a high-voltage winding in a high-low short circuit experiment;
FIG. 24 is a radial transient stress waveform of a coil at the upper end of a low-voltage winding in a high-low short circuit experiment;
FIG. 25 is a waveform diagram of axial transient stress of coils at the upper end of a low-voltage winding in a high-low short circuit test;
FIG. 26 is a radial transient stress waveform of a seventh coil segment of a high-voltage winding in a high-low short-circuit experiment;
FIG. 27 is a waveform diagram of axial transient stress of a seventh coil segment of a high-voltage winding in a high-low short-circuit test;
FIG. 28 is a radial transient stress waveform of a seventh segmented coil of a low-voltage winding in a high-low short circuit experiment;
fig. 29 is a waveform diagram of axial transient stress of a seventh coil partition of the low-voltage winding in a high-low short circuit experiment.
Detailed Description
The embodiment of the invention provides a method and a device for calculating the stress of a 220kV transformer winding when short-circuit power is applied to the winding, and lays a foundation for carrying out multi-physical-field coupling numerical simulation on the transformer.
In order to make the objects, features and advantages of the present invention more obvious and understandable, 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, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of a method for calculating a stress of a 220kV transformer winding when receiving short-circuit power according to the embodiment of the present invention includes:
101. establishing a transformer model, and equally dividing a high-voltage winding, a medium-voltage winding and a low-voltage winding of the transformer model into ten subareas;
102. establishing a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding and the low-voltage winding, and establishing a turn of coil for the seventh subarea of the high-voltage winding, the medium-voltage winding and the low-voltage winding to obtain a transformer model after the coils are established;
103. carrying out first short-circuit experiment simulation operation on the transformer model after the coil is established under a preset first condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh sectional coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh sectional coil of the medium-voltage winding;
104. and carrying out second short circuit experiment simulation operation on the transformer model after the coil is established under a preset second condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding.
The embodiment of the invention provides a method for calculating the stress of a 220kV transformer winding when short-circuit power is applied to the winding, and lays a foundation for carrying out multi-physical-field coupling numerical simulation on the transformer.
Referring to fig. 2, another embodiment of the method for calculating the stress of the 220kV transformer winding when receiving the short-circuit power according to the embodiment of the present invention includes:
201. establishing a transformer model, and equally dividing a high-voltage winding, a medium-voltage winding and a low-voltage winding of the transformer model into ten subareas;
202. after the medium-voltage winding is opened, 2927A of short-circuit current is applied to the high-voltage winding and 33803.9A of short-circuit current is applied to the low-voltage winding, calculating resultant force received by each partition winding of the transformer model to obtain a resultant force curve received by the high-voltage winding, a resultant force curve received by the medium-voltage winding and a resultant force curve received by the low-voltage winding;
203. establishing a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding and the low-voltage winding, and establishing a turn of coil for the seventh subarea of the high-voltage winding, the medium-voltage winding and the low-voltage winding to obtain a transformer model after the coils are established;
204. after the medium-voltage winding is in short circuit and the low-voltage winding is in open circuit, applying a preset first short-circuit current to the high-voltage winding, and applying a preset second short-circuit current to the short-circuited medium-voltage winding to obtain the transient stress condition of a top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding;
205. after the medium-voltage winding is opened and the low-voltage winding is short-circuited, a preset third short-circuit current is applied to the high-voltage winding, and a preset fourth short-circuit current is applied to the short-circuited low-voltage winding, so that the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding are obtained.
Before analyzing the transient stress of the transformer winding, the embodiment of the invention analyzes the stress condition of the whole winding when the short-circuit current of the winding reaches the peak value, and summarizes some parts with larger stress of the winding. And then, under the condition of applying transient current, carrying out thinning and partitioning on the model of the weak part aiming at the weak parts to obtain a stress curve of the parts changing along with time.
In the above, the stress calculation method for the 220kV transformer winding subjected to the short-circuit power is described in detail, and for convenience of understanding, the following description will be given of an application of the stress calculation method for the 220kV transformer winding subjected to the short-circuit power in a specific application scenario, where the application scenario includes:
as shown in fig. 4, the winding of the transformer is first equally divided into 10 sections from bottom to top in height, and then after a suitable model is established, the peak value of the short-circuit current is applied as excitation, the short-circuit current applied to the high-voltage winding is 2927A, the short-circuit current applied to the low-voltage winding is 33803.9a, and the medium-voltage winding is opened, so that static simulation analysis is performed.
And then calculating resultant force received by each partition winding, namely the radial resultant force and the axial resultant force, wherein the radial resultant force in the software is divided into the resultant forces received in the X direction and the Y direction in a transformer model coordinate system, and the axial force is the resultant force in the Z-axis direction. After the data calculated by the software is exported, curves like fig. 5 to 8 can be made.
From fig. 5 to 8, the following rules can be derived:
(1) the radial force applied to the high-voltage winding is outward and is equivalent to outward tensile force, and the radial force applied to the low-voltage winding is inward and is equivalent to inward compression force; the axial force of the high-voltage winding and the low-voltage winding is compressed towards the middle of the winding.
(2) The radial resultant force and the axial resultant force borne by the low-voltage winding are greater than the corresponding resultant force borne by the high-voltage winding;
(3) the high-voltage winding and the low-voltage winding of the ten-section model are subjected to the maximum radial resultant force in the seventh section;
(4) the high-voltage winding and the low-voltage winding of the ten-section model are subjected to the maximum axial resultant force at two end parts.
When transient stress analysis is carried out on the transformer winding, stress curves of each part of the winding changing along with time cannot be made, so that the parts with larger stress are divided in a thinning mode to obtain the stress curves of the parts changing along with time. Therefore, for the high-voltage winding, a one-turn coil model is independently established at the upper end part of the winding, and then a one-turn coil model is independently established in the seventh subarea; similarly, for medium and low voltage windings, a single turn coil model is established separately at the upper end of the winding, and then a single turn coil model is established separately in the seventh division. The established model is shown in fig. 9.
Firstly, establishing high-medium (medium voltage winding short circuit, low voltage winding open circuit) short circuit experiment simulation analysis: the high voltage winding is energized by applying a short circuit current as in fig. 10, and correspondingly, the medium voltage winding is energized by applying a short circuit current as in fig. 11.
When the transformer is in short circuit, the action time of relay protection is generally within 100ms, and the computing capacity of a computer is considered, the simulation time length is set to be 0.08s, namely the simulation time length is equivalent to four periods under power frequency, and the simulation step length is 0.0002 s.
After the simulation is completed, the coil models separately built in the winding end and the seventh section of the winding can be obtained, that is, the transient stress condition of the coil of one turn can be obtained, and the transient stress condition of the coil of one turn is shown in fig. 12 to 19. It should be noted that force _ X and force _ Y are divided into an X-axis direction and a Y-axis direction.
In fig. 12, the Force _ x ordinate is kN, and the Force _ y ordinate is N.
In FIG. 14, Force _ x is expressed in kN on the ordinate and Force _ y is expressed in N on the ordinate.
In FIG. 16, Force _ x is represented by kN on the ordinate and Force _ y is represented by kN on the ordinate.
In FIG. 18, Force _ x is represented by kN on the ordinate and Force _ y is represented by kN on the ordinate.
Similarly, establishing a high-low (low-voltage winding short circuit, medium-voltage winding open circuit) short circuit experiment simulation analysis: the high-voltage winding is energized by applying a short-circuit current as shown in fig. 20, and correspondingly, the low-voltage winding is energized by applying a short-circuit current as shown in fig. 21.
Setting the simulation time length to 0.08s and the simulation step length to 0.0002 s; after the simulation is completed, the coil models separately built in the winding end and the seventh section of the winding can be obtained, that is, the transient stress condition of the coil with one turn can be obtained, and the transient stress condition of the coil with one turn is shown in fig. 22 to 29.
In fig. 22, the Force _ x ordinate is N, and the Force _ y ordinate is N.
In FIG. 24, Force _ x is expressed in kN on the ordinate and Force _ y is expressed in N on the ordinate.
In FIG. 26, Force _ x is plotted on the ordinate as N and Force _ y is plotted as kN.
In fig. 28, the Force _ x ordinate is represented by N, and the Force _ y ordinate is represented by N.
The following conclusion can be summarized from the transient stress waveform of the winding:
(1) no matter the high-voltage winding is used for carrying out short circuit experiments on the low-voltage winding or the high-voltage winding is used for carrying out short circuit experiments on the medium-voltage winding, the electromagnetic force borne by the high-voltage winding is far smaller than the electromagnetic force borne by the medium-voltage winding and the low-voltage winding.
(2) Under the impact of short-circuit current, the amplitude variation trend of the transient stress waveform of the winding is approximately consistent with that of the short-circuit current, but when the transient stress waveform crosses zero for the first time, the waveform begins to coincide with an X axis for 0.04s, and the time for the second time to coincide with the X axis is shortened; the further back the coincidence time is, the shorter and gradually away from the X-axis.
(3) The maximum value of the transient stress waveform occurs at the time of 0.01s, the short-circuit current reaches the maximum value at the time, the maximum value reaches the meganewton level, and tests on a cushion block, a stay and a pressing plate of a winding are huge.
(4) Because the three-phase short circuit of the medium-voltage winding is larger than the short-circuit current of the low-voltage winding, the electromagnetic force borne by the winding during the short circuit is sequentially arranged by the medium-voltage winding, the low-voltage winding and the high-voltage winding.
Referring to fig. 3, an embodiment of a stress calculating device for a 220kV transformer winding under short-circuit power includes:
the first establishing unit 301 is configured to establish a transformer model, and equally divide a high-voltage winding, a medium-voltage winding, and a low-voltage winding of the transformer model into ten partitions;
a second establishing unit 302, configured to establish a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding, and the low-voltage winding, and establish a turn of coil for a seventh partition of the high-voltage winding, the medium-voltage winding, and the low-voltage winding, so as to obtain a transformer model after the coils are established;
the first short-circuit unit 303 is configured to perform a first short-circuit experiment simulation operation on the transformer model after the coil is established under a preset first condition, so as to obtain a transient stress condition of a top coil of the high-voltage winding, a transient stress condition of a seventh segment coil of the high-voltage winding, a transient stress condition of a top coil of the medium-voltage winding, and a transient stress condition of a seventh segment coil of the medium-voltage winding;
the second short-circuit unit 304 is configured to perform a second short-circuit experiment simulation operation on the transformer model after the coil is established under a preset second condition, so as to obtain a transient stress condition of the top coil of the high-voltage winding, a transient stress condition of the seventh segment coil of the high-voltage winding, a transient stress condition of the top coil of the low-voltage winding, and a transient stress condition of the seventh segment coil of the low-voltage winding.
The first short-circuit unit 303 is further configured to apply a preset first short-circuit current to the high-voltage winding after the medium-voltage winding is short-circuited and the low-voltage winding is open-circuited, and apply a preset second short-circuit current to the short-circuited medium-voltage winding to obtain a transient stress condition of the top coil of the high-voltage winding, a transient stress condition of the seventh segment coil of the high-voltage winding, a transient stress condition of the top coil of the medium-voltage winding, and a transient stress condition of the seventh segment coil of the medium-voltage winding.
The second short-circuit unit 304 is further configured to apply a preset third short-circuit current to the high-voltage winding after the medium-voltage winding is opened and the low-voltage winding is short-circuited, and apply a preset fourth short-circuit current to the short-circuited low-voltage winding, so as to obtain a transient stress condition of the top coil of the high-voltage winding, a transient stress condition of the seventh segment coil of the high-voltage winding, a transient stress condition of the top coil of the low-voltage winding, and a transient stress condition of the seventh segment coil of the low-voltage winding.
The device for calculating the stress of the 220kV transformer winding when short-circuit power is applied to the winding further comprises: and a third short-circuit unit 305, configured to calculate a resultant force received by each partition winding of the transformer model after opening the middle-voltage winding, applying a short-circuit current of 2927A to the high-voltage winding, and applying a short-circuit current of 33803.9a to the low-voltage winding, so as to obtain a resultant force curve received by the high-voltage winding, a resultant force curve received by the middle-voltage winding, and a resultant force curve received by the low-voltage winding.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (4)
1. A stress calculation method for 220kV transformer windings subjected to short-circuit power is characterized by comprising the following steps:
s1: establishing a transformer model, and equally dividing a high-voltage winding, a medium-voltage winding and a low-voltage winding of the transformer model into ten subareas; specifically, a winding of the transformer is equally divided into 10 sections from bottom to top in height;
s2: establishing a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding and the low-voltage winding, and establishing a turn of coil for the seventh partition of the high-voltage winding, the medium-voltage winding and the low-voltage winding to obtain a transformer model after the coils are established;
s3: carrying out first short-circuit experiment simulation operation on the transformer model after the coil is established under a preset first condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding;
the method specifically comprises the following steps:
after the medium-voltage winding is in short circuit and the low-voltage winding is in open circuit, applying a preset first short-circuit current to the high-voltage winding, and applying a preset second short-circuit current to the medium-voltage winding after short circuit to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding;
s4: carrying out second short-circuit experiment simulation operation on the transformer model after the coil is established under a preset second condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding;
the method specifically comprises the following steps:
after the medium-voltage winding is opened and the low-voltage winding is short-circuited, a preset third short-circuit current is applied to the high-voltage winding, and a preset fourth short-circuit current is applied to the short-circuited low-voltage winding, so that the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of the seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding are obtained.
2. The method for calculating the stress of the 220kV transformer winding when short-circuit power is applied to the winding according to claim 1, wherein the step S1 is followed by:
after the medium-voltage winding is opened, 2927A of short-circuit current is applied to the high-voltage winding and 33803.9A of short-circuit current is applied to the low-voltage winding, the resultant force received by each partition winding of the transformer model is calculated, and a resultant force curve received by the high-voltage winding, a resultant force curve received by the medium-voltage winding and a resultant force curve received by the low-voltage winding are obtained.
3. A stress calculation device when a 220kV transformer winding is subjected to short-circuit power is characterized by comprising:
the transformer modeling device comprises a first building unit, a second building unit and a third building unit, wherein the first building unit is used for building a transformer model and equally dividing a high-voltage winding, a medium-voltage winding and a low-voltage winding of the transformer model into ten subareas; specifically, a winding of the transformer is equally divided into 10 sections from bottom to top in height;
the second establishing unit is used for establishing a turn of coil for the top ends of the high-voltage winding, the medium-voltage winding and the low-voltage winding, and establishing a turn of coil for the seventh partition of the high-voltage winding, the medium-voltage winding and the low-voltage winding to obtain a transformer model after the coils are established;
the first short-circuit unit is used for carrying out first short-circuit experiment simulation operation on the transformer model after the coil is established under a preset first condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the medium-voltage winding and the transient stress condition of the seventh subarea coil of the medium-voltage winding;
the first short-circuit unit is further configured to apply a preset first short-circuit current to the high-voltage winding after the medium-voltage winding is short-circuited and the low-voltage winding is open-circuited, and apply a preset second short-circuit current to the short-circuited medium-voltage winding to obtain a transient stress condition of a top coil of the high-voltage winding, a transient stress condition of a seventh segment coil of the high-voltage winding, a transient stress condition of a top coil of the medium-voltage winding, and a transient stress condition of the seventh segment coil of the medium-voltage winding;
the second short-circuit unit is used for carrying out second short-circuit experiment simulation operation on the transformer model after the coil is established under a preset second condition to obtain the transient stress condition of the top coil of the high-voltage winding, the transient stress condition of a seventh subarea coil of the high-voltage winding, the transient stress condition of the top coil of the low-voltage winding and the transient stress condition of the seventh subarea coil of the low-voltage winding;
the second short-circuit unit is further configured to apply a preset third short-circuit current to the high-voltage winding after the medium-voltage winding is opened and the low-voltage winding is short-circuited, and apply a preset fourth short-circuit current to the short-circuited low-voltage winding to obtain a transient stress condition of the top coil of the high-voltage winding, a transient stress condition of the seventh segment coil of the high-voltage winding, a transient stress condition of the top coil of the low-voltage winding, and a transient stress condition of the seventh segment coil of the low-voltage winding.
4. The device for calculating the stress of the 220kV transformer winding when short-circuit power is applied to the 220kV transformer winding according to claim 3, further comprising:
and the third short-circuit unit is used for calculating the resultant force received by each partition winding of the transformer model after the medium-voltage winding is opened, 2927A short-circuit current is applied to the high-voltage winding and 33803.9A short-circuit current is applied to the low-voltage winding, and obtaining a resultant force curve received by the high-voltage winding, a resultant force curve received by the medium-voltage winding and a resultant force curve received by the low-voltage winding.
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