CN112924897A - Online evaluation method and device for short-circuit electrodynamic force of transformer - Google Patents
Online evaluation method and device for short-circuit electrodynamic force of transformer Download PDFInfo
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- CN112924897A CN112924897A CN202110122281.8A CN202110122281A CN112924897A CN 112924897 A CN112924897 A CN 112924897A CN 202110122281 A CN202110122281 A CN 202110122281A CN 112924897 A CN112924897 A CN 112924897A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/62—Testing of transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
The invention discloses an online evaluation method of transformer short-circuit electrodynamic force, which comprises the following steps: acquiring a power frequency steady-state value of a short-circuit current of a node where a transformer is located in real time; acquiring relevant parameters of the transformer, wherein the relevant parameters comprise: wiring structure parameters of three sides of the transformer and material mechanics parameters of the transformer; calculating the electrodynamic force of the transformer winding according to the steady-state value of the power frequency of the short-circuit current and the relevant parameters of the transformer; and performing online evaluation on the operation safety of the transformer according to the electric power. According to the invention, by acquiring the short-circuit current periodic component data of the position of the transformer and further combining the main transformer structure parameters, the electrodynamic force possibly occurring in the short-circuit process and the damage to the transformer are calculated, and more accurate data are provided for the online evaluation of the operation reliability of the transformer.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a method and a device for online evaluation of short-circuit electrodynamic force of a transformer, terminal equipment and a computer readable storage medium.
Background
The electric power system is huge in short circuit moment, the damage to the structure and the function of equipment can be caused, the operation safety and the operation service life of the equipment are influenced, particularly for key equipment such as a transformer, the maximum short-circuit current which possibly appears needs to be evaluated on line according to the position of a power grid where the equipment is located, and the safety under the action of the short-circuit electric power which possibly appears is judged.
At present, in the existing online evaluation method, a short-circuit current calculated value is obtained through design and simulation calculation, and is recalculated at intervals (such as one year) according to grid structure change, but in the existing online evaluation method, the real-time performance and the accuracy of data acquisition are difficult to ensure, and accurate online evaluation is difficult to achieve on-line evaluation on possible electrodynamic force hazards on a transformer.
Disclosure of Invention
The purpose of the invention is: the method and the device for online evaluation of the short-circuit electrodynamic force of the transformer are provided, the electrodynamic force possibly occurring in the short-circuit process and the damage to the transformer are calculated by acquiring the short-circuit current periodic component data of the position of the transformer and further combining with main transformer structure parameters, and more accurate data are provided for online evaluation of the operation reliability of the transformer.
In order to achieve the above object, the present invention provides an online evaluation method of a short-circuit electrodynamic force of a transformer, comprising:
acquiring a power frequency steady-state value of a short-circuit current of a node where a transformer is located in real time; acquiring relevant parameters of the transformer, wherein the relevant parameters comprise: wiring structure parameters of three sides of the transformer and material mechanics parameters of the transformer; calculating the electrodynamic force of the transformer winding according to the steady-state value of the power frequency of the short-circuit current and the relevant parameters of the transformer; and performing online evaluation on the operation safety of the transformer according to the electric power.
Further, the wiring structure parameters of the three sides of the transformer comprise: star connection and angle connection.
Further, the material mechanics parameters of the transformer include: a strength parameter, a stiffness parameter, and a stability parameter.
Further, the electrodynamic force of the transformer winding is calculated according to the steady-state value of the short-circuit current power frequency and the relevant parameters of the transformer, and the following formula is specifically adopted:
wherein, F short-circuit electromotive force; beta is a1Is a coefficient related to the location of the short-circuit point; beta is a2Coefficients related to materials and wiring methods; i.e. idlShort-circuit current.
Further, the obtaining of the steady-state value of the short-circuit current of the node where the transformer is located specifically includes:
obtaining steady-state values of the voltage of the bus before and after reactive power equipment is put into use; calculating to obtain the difference value of the bus voltages through the power frequency steady state values of the bus voltages before and after the input;
acquiring the reactive capacity of the reactive equipment;
calculating the short-circuit capacity of the transformer substation according to the difference value of the bus voltage and the reactive capacity;
according to the short-circuit capacity and the equipment impedance parameters, calculating to obtain the steady-state values of the short-circuit current of the high side and the medium side of the transformer substation, wherein the equipment impedance parameters comprise: a transformer device impedance parameter and a series impedance device impedance parameter.
Further, the short-circuit capacity of the power system is calculated according to the difference of the bus voltages and the reactive capacity, and the following formula is specifically adopted:
wherein Q is the capacitor bank capacity, Δ U is the bus voltage rise, Us0Switching the front bus voltage, S, for the parallel capacitor arrangementdThe capacity of three-phase short circuit of the bus is shown. 7. The online evaluation method of transformer short-circuit electrodynamic force according to claim 5, characterized in that the reactive equipment comprises: a capacitor bank and an inductor bank.
The embodiment of the invention also provides an online evaluation device of the short-circuit electrodynamic force of the transformer, which comprises the following steps: a short-circuit current acquisition module, a transformer parameter acquisition module, a short-circuit electrodynamic force calculation module and an online evaluation module, wherein,
the short-circuit current acquisition module is used for acquiring a power frequency steady-state value of the short-circuit current of a node where the transformer is located;
the transformer parameter obtaining module is configured to obtain relevant parameters of the transformer, where the relevant parameters include: wiring structure parameters of three sides of the transformer and material mechanics parameters of the transformer;
the short-circuit electrodynamic force calculation module is used for calculating the short-circuit electrodynamic force of the transformer winding according to the short-circuit current power frequency steady-state value and the relevant parameters of the transformer;
and the thermal online evaluation module is used for carrying out online evaluation on the operation safety of the transformer according to the short-circuit electrodynamic force of the transformer winding.
An embodiment of the present invention further provides a computer terminal device, including: one or more processors; a memory coupled to the processor for storing one or more programs; when executed by the one or more processors, cause the one or more processors to implement the method for online assessment of transformer short-circuit electrodynamic force as described in any one of the above.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the online evaluation method for short-circuit electrodynamic force of a transformer according to any one of the above-mentioned embodiments.
Compared with the prior art, the online evaluation method and the online evaluation device for the short-circuit electrodynamic force of the transformer have the beneficial effects that:
according to the method, the real-time and actually measured data of the short-circuit current of the three sides of the main transformer are obtained in a mode of obtaining the real-time value of the short-circuit capacity of the power grid on line, and errors caused by the fact that offline calculation is adopted in the past and the calculation period is long are improved. The short-circuit electrodynamic force is further calculated according to the actual value of the short-circuit current and by combining the material characteristics of the main transformer, the obtained conclusion can more closely reflect the influence possibly caused to the transformer when the short circuit occurs in the near region at the position of the transformer, and the accuracy of the online evaluation of the running state of the transformer is improved. And reduces the manpower consumption for periodically (such as annually) carrying out the simulation calculation of the full-calculation short-circuit current.
Drawings
Fig. 1 is a schematic flow chart of a method for online evaluation of short-circuit electrodynamic force of a transformer according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of acquiring a steady-state value of a short-circuit current power frequency of a node where a transformer is located in real time according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an online evaluation apparatus for short-circuit electrodynamic force of a transformer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments 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.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
The first embodiment of the present invention:
as shown in fig. 1, an embodiment of the present invention provides an online evaluation method of a short-circuit electrodynamic force of a transformer, including:
s10, acquiring a power frequency steady-state value of the short-circuit current of a node where the transformer is located in real time;
specifically, the steps can be divided into the following steps:
s11, obtaining power frequency steady-state values of the bus voltage before and after reactive power equipment is put into use; calculating to obtain the difference value of the bus voltages through the power frequency steady state values of the bus voltages before and after the input;
it should be noted that the reactive power device refers to a compensation device in the reactive power compensation process, and the reactive power compensation is a technology that plays a role in improving the power factor of the power grid in the power supply system, reduces the loss of the power supply transformer and the transmission line, improves the power supply efficiency, and improves the power supply environment. The reactive power compensation device is in an indispensable and very important place in the power supply system. The compensation device is reasonably selected, so that the loss of the power grid can be reduced to the maximum extent, and the quality of the power grid is improved. Conversely, improper selection or use may cause many factors such as power supply system, voltage fluctuation, harmonic increase, and the like.
Specifically, the bus refers to the connection of the voltage distribution devices bai at all levels in the substation, and the connection of the electrical equipment such as the transformer and the corresponding distribution device, and mostly adopts a wire or a stranded wire with a rectangular or circular cross section, which is collectively called as the bus. The bus bars function to collect, distribute and transfer electrical energy. In an electric power system, a bus bar connects together various current-carrying branch circuits in a distribution device, and functions to collect, distribute, and transfer electric energy. The bus is roughly divided into the following three types according to appearance and structure: a hard bus bar. Including rectangular bus bars, slotted bus bars, tubular bus bars, etc. And a flexible bus. Comprises an aluminum stranded wire, a copper stranded wire, a steel-cored aluminum stranded wire, an expanded hollow conductor and the like. And closing the bus. The system comprises a common box bus, a split phase bus and the like. The bus bar is made of copper and aluminum materials with high conductivity, is used for transmitting electric energy, and collects and distributes the electric power. The power station or the transformer substation is used for transmitting the main lead for electric energy.
S12, acquiring the reactive capacity of the reactive equipment;
it should be noted that the reactive capacity of the reactive power equipment can be calculated by the nameplate parameter of the reactive power equipment.
S13, calculating the short-circuit capacity of the power system according to the difference value of the bus voltage and the reactive capacity;
it should be noted that, the short-circuit capacity of the power system may be calculated by using various methods for calculating reactive devices, and here, the reactive device of the present invention is exemplified by a capacitor bank, but the reactive device of the present invention is not limited to a capacitor, and for example, a capacitor is used as the short-circuit capacity of the reactive device power system, and the calculation method is as follows:
wherein Q is the capacitor bank capacity, Δ U is the bus voltage rise, Us0Switching the front bus voltage, S, for the parallel capacitor arrangementdThe capacity of three-phase short circuit of the bus is shown.
S14, calculating to obtain real-time calculation values of the short-circuit current of the high side and the middle side of the transformer substation according to the short-circuit capacity and the equipment impedance parameters, wherein the equipment impedance parameters comprise: a transformer device impedance parameter and a series impedance device impedance parameter.
Specifically, in the step, the short-circuit current at the low side of the substation is calculated through the short-circuit capacity, and then the real-time calculated values of the short-circuit current at the high side and the short-circuit current at the middle side of the substation are calculated by combining the impedance parameters of the equipment.
S20, obtaining relevant parameters of the transformer, wherein the relevant parameters comprise: wiring structure parameters of three sides of the transformer and material mechanics parameters of the transformer;
specifically, the wiring structure parameters of the transformer include: star connection and angle connection.
Furthermore, the star connection is fully called a star connection method, and the star connection method is a connection method of a three-phase alternating current power supply and a three-phase electric appliance. The ends X, Y, Z of the three windings of the three-phase power supply are connected together to form a common point O, and three end wires are led out from the starting end A, B, C. The system is characterized in that three sinusoidal power supplies with the same frequency, the same amplitude and the phase difference of 120 degrees in sequence are connected in a certain mode to supply power to the outside.
Furthermore, the whole process of the angle connection is a delta connection method, and the delta connection method refers to a delta connection method of three-phase power, wherein all phase power supplies or loads are sequentially connected end to end, and each connected point is led out to serve as three phase lines of the three-phase power. The delta connection method has no neutral point, and no neutral line can be led out, so that only a three-phase three-wire system is provided. After the ground wire is added, a three-phase four-wire system is formed.
It should be noted that the material mechanical parameters of the transformer include: the method comprises the following steps: a strength parameter, a stiffness parameter, and a stability parameter.
Specifically, the strength parameter is called material strength, and the strength of the material refers to the ability of the material to resist damage under the action of external force, and is called the strength of the material. When the material is acted by external force, the internal stress is generated, the external force is increased, the stress is correspondingly increased, and the material is damaged until the bonding force between the internal particles of the material is not enough to resist the acted external force. The limit reached by the stress at the time of failure of a material is called the ultimate strength of the material, often denoted by f.
In particular, the stiffness parameter refers to the ability of a material or structure to resist elastic deformation when subjected to a force. Is an indication of the ease with which a material or structure can be elastically deformed. The stiffness of a material is usually measured by the modulus of elasticity E. In the macroscopic elastic range, stiffness is the proportionality coefficient of part load proportional to displacement, i.e. the force required to cause a unit displacement. Its inverse is called compliance, i.e. displacement due to unit force. Stiffness can be divided into static stiffness and dynamic stiffness.
In particular, the stability parameters include thermal stability of the material and dimensional stability of the material.
S30, calculating the electrodynamic force of the transformer winding according to the power frequency steady-state value of the short-circuit current and the relevant parameters of the transformer;
specifically, the electrodynamic force of the transformer winding is calculated according to the steady-state value of the power frequency of the short-circuit current and the relevant parameters of the transformer, and the following formula is specifically adopted:
wherein, F short-circuit electromotive force; beta is a1Is a coefficient related to the location of the short-circuit point; beta is a2Coefficients related to materials and wiring methods; i.e. idlShort-circuit current.
It should be noted that the electromotive force, specifically, the electromotive force generated by the short-circuit current, and the electromotive force of the short-circuit current, specifically, the electrical device bai and the current-carrying conductor du are referred to as an electromotive zhuan force, when a current flows through zhi, a force dao exists between them. In normal operation, the electromotive force is not easily detected because of the small operating current. When short-circuited, particularly at the moment when a rush current flows, the electromotive force is generated most, possibly causing deformation of the conductor or destruction of the electrical equipment.
And S40, carrying out online evaluation on the operation safety of the transformer according to the electrodynamic force.
Whether the operation environment of the transformer is safe or not is judged according to the magnitude of the generated electrodynamic force of the short-circuit current, if the generated electrodynamic force is larger than the maximum value which can be borne by the transformer, the operation of the transformer is judged to be unsafe, and otherwise, the operation is safe.
Compared with the prior art, the online evaluation method for the short-circuit electrodynamic force of the transformer has the beneficial effects that:
according to the method, the real-time and actually measured data of the short-circuit current of the three sides of the main transformer are obtained in a mode of obtaining the real-time value of the short-circuit capacity of the power grid on line, and errors caused by the fact that offline calculation is adopted in the past and the calculation period is long are improved. The short-circuit electrodynamic force is further calculated according to the actual value of the short-circuit current and by combining the material characteristics of the main transformer, the obtained conclusion can more closely reflect the influence possibly caused to the transformer when the short circuit occurs in the near region at the position of the transformer, and the accuracy of the online evaluation of the running state of the transformer is improved. And reduces the manpower consumption for periodically (such as annually) carrying out the simulation calculation of the full-calculation short-circuit current.
Second embodiment of the invention:
as shown in fig. 3, an embodiment of the present invention further provides an online evaluation apparatus 200 for short-circuit electromotive force of a transformer, including: a short-circuit current acquisition module 201, a transformer parameter acquisition module 202, a short-circuit electrodynamic force calculation module 203, and an online evaluation module 204, wherein,
the short-circuit current acquisition module 201 is configured to acquire a power frequency steady-state value of a short-circuit current of a node where the transformer is located;
the transformer parameter obtaining module 202 is configured to obtain relevant parameters of the transformer, where the relevant parameters include: wiring structure parameters of three sides of the transformer and material mechanics parameters of the transformer;
the short-circuit electrodynamic force calculation module 203 is configured to calculate a short-circuit electrodynamic force of the transformer winding according to the short-circuit current power frequency steady-state value and the relevant parameter of the transformer;
the online evaluation module 204 is configured to perform online evaluation on the operation safety of the transformer according to the short-circuit electrodynamic force of the transformer winding.
Third embodiment of the invention:
an embodiment of the present invention further provides a computer terminal device, including: one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement an online assessment of transformer short-circuit electrodynamic force as described in any one of the above.
It should be noted that the processor may be a Central Processing Unit (CPU), other general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an application-specific programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., the general-purpose processor may be a microprocessor, or the processor may be any conventional processor, the processor is a control center of the terminal device, and various interfaces and lines are used to connect various parts of the terminal device.
The memory mainly includes a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like, and the data storage area may store related data and the like. In addition, the memory may be a high speed random access memory, may also be a non-volatile memory, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a flash card (FlashCard), and the like, or may also be other volatile solid state memory devices.
It should be noted that the terminal device may include, but is not limited to, a processor and a memory, and those skilled in the art will understand that the terminal device is only an example and does not constitute a limitation of the terminal device, and may include more or less components, or combine some components, or different components.
The fourth embodiment of the present invention:
embodiments of the present invention also provide a computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, enables online evaluation of a short-circuit electrodynamic force of a transformer as described in any one of the above.
It should be noted that the computer program may be divided into one or more modules/units (e.g., computer program), and the one or more modules/units are stored in the memory and executed by the processor to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used for describing the execution process of the computer program in the terminal device.
The above-mentioned embodiments are provided to further explain the objects, technical solutions and advantages of the present invention in detail, and it should be understood that the above-mentioned embodiments are only examples of the present invention and are not intended to limit the scope of the present invention. It should be understood that any modifications, equivalents, improvements and the like, which come within the spirit and principle of the invention, may occur to those skilled in the art and are intended to be included within the scope of the invention.
Claims (10)
1. A method for online evaluation of short-circuit electrodynamic force of a transformer, comprising:
acquiring a power frequency steady-state value of a short-circuit current of a node where a transformer is located in real time;
acquiring relevant parameters of the transformer, wherein the relevant parameters comprise: wiring structure parameters of three sides of the transformer and material mechanics parameters of the transformer;
calculating the electrodynamic force of the transformer winding according to the steady-state value of the power frequency of the short-circuit current and the relevant parameters of the transformer;
and performing online evaluation on the operation safety of the transformer according to the electric power.
2. The online evaluation method of short-circuit electrodynamic force of the transformer according to claim 1, wherein the wiring structure parameters of the three sides of the transformer include: star connection and angle connection.
3. The method for on-line evaluation of the short-circuit additive effect of the transformer according to claim 1, wherein the material mechanical parameters of the transformer comprise: a strength parameter, a stiffness parameter, and a stability parameter.
4. The method for on-line evaluation of short-circuit electrodynamic force of a transformer according to claim 1, wherein the electrodynamic force of the winding of the transformer is calculated according to the steady-state value of the short-circuit current power frequency and the relevant parameters of the transformer, and specifically, the following formula is adopted:
wherein, F short-circuit electromotive force; beta is a1Is a coefficient related to the location of the short-circuit point; beta is a2Coefficients related to materials and wiring methods; i.e. idlShort-circuit current.
5. The online evaluation method for the short-circuit electrodynamic force of the transformer according to claim 1, wherein the short-circuit current steady-state value of the node where the transformer is located is obtained in real time, and specifically comprises:
obtaining steady-state values of the voltage of the bus before and after reactive power equipment is put into use; calculating to obtain the difference value of the bus voltages through the power frequency steady state values of the bus voltages before and after the input;
acquiring the reactive capacity of the reactive equipment;
calculating the short-circuit capacity of the transformer substation according to the difference value of the bus voltage and the reactive capacity;
according to the short-circuit capacity and the equipment impedance parameters, calculating to obtain the steady-state values of the short-circuit current of the high side and the medium side of the transformer substation, wherein the equipment impedance parameters comprise: a transformer device impedance parameter and a series impedance device impedance parameter.
6. The method for on-line evaluation of short-circuit electrodynamic force of transformer according to claim 5, wherein the short-circuit capacity of the power system is calculated according to the difference of the bus voltages and the reactive capacity by using the following formula:
wherein Q is the capacitor bank capacity, Δ U is the bus voltage rise, Us0Switching the front bus voltage, S, for the parallel capacitor arrangementdThe capacity of three-phase short circuit of the bus is shown.
7. The online evaluation method of transformer short-circuit electrodynamic force according to claim 5, characterized in that the reactive equipment comprises: a capacitor bank and an inductor bank.
8. An apparatus for online evaluation of short-circuit electrodynamic force of a transformer, comprising: a short-circuit current acquisition module, a transformer parameter acquisition module, a short-circuit electrodynamic force calculation module and an online evaluation module, wherein,
the short-circuit current acquisition module is used for acquiring a power frequency steady-state value of the short-circuit current of a node where the transformer is located;
the transformer parameter obtaining module is configured to obtain relevant parameters of the transformer, where the relevant parameters include: wiring structure parameters of three sides of the transformer and material mechanics parameters of the transformer;
the short-circuit electrodynamic force calculation module is used for calculating the short-circuit electrodynamic force of the transformer winding according to the short-circuit current power frequency steady-state value and the relevant parameters of the transformer;
and the online evaluation module is used for carrying out online evaluation on the operation safety of the transformer according to the short-circuit electrodynamic force of the transformer winding.
9. A computer terminal device, comprising:
one or more processors;
a memory coupled to the processor for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement the method for online assessment of transformer short-circuit electrodynamic force according to any one of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a method for online evaluation of short-circuit electrodynamic forces of a transformer according to any one of claims 1 to 7.
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| US20240003987A1 (en) * | 2022-05-17 | 2024-01-04 | Hitachi Energy Switzerland Ag | Method and system for evaluating a condition of a power grid |
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