CN106768559B - A kind of dynamic force analysis method of transformer winding under short trouble - Google Patents

A kind of dynamic force analysis method of transformer winding under short trouble Download PDF

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Publication number
CN106768559B
CN106768559B CN201710030289.5A CN201710030289A CN106768559B CN 106768559 B CN106768559 B CN 106768559B CN 201710030289 A CN201710030289 A CN 201710030289A CN 106768559 B CN106768559 B CN 106768559B
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China
Prior art keywords
transformer
winding
load
magnetic
short
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CN201710030289.5A
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Chinese (zh)
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CN106768559A (en
Inventor
王雪
吴涛
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华北电力大学(保定)
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/72Testing of electric windings

Abstract

The invention discloses a kind of dynamic force analysis methods of transformer winding under short trouble, under ANSYS Mechanical APDL software environment, select magnetic-structure Coupling finite element unit, direct-coupling magnetic field and structure field;According to transformer device structure parameter, transformer two-dimensional axial symmetric finite element model is established;According to Magnetic fluxleakage distribution and structural deformation feature, transformer boundary condition is set;According to analogue transformer short trouble or physical fault recorder data, dynamic load is defined;Using transient state analyzing method, magnetic flux leakage and winding stress dynamic changes in calculating transformer short-circuit process.This method realizes the dynamic analysis to magnetic flux leakage and winding stress internal in transformer short-circuit transient process.

Description

A kind of dynamic force analysis method of transformer winding under short trouble

Technical field

The invention belongs to transformer short-circuit specificity analysis technical field, it is related to a kind of the dynamic of transformer winding under short trouble State force analysis method.

Background technique

Power transformer is one of the important equipment in electric system, and operation conditions directly affects stablizing for power grid and transports Row.Short trouble occurs for Accident of Transformer statistics display, transformer, is to threaten transformer peace due to its anti-short circuit capability deficiency The principal element of row for the national games.Transformer winding may cause axial or radial unstability, when serious under the impact of huge short-circuit force Entire winding is even resulted in collapse.

Since power transformer involves great expense, it is difficult to use Research on experimental methods transformer anti-short circuit capability.Early stage for The research of transformer winding anti-short circuit capability mainly uses static force, using the entirety that coil is static as one, cannot consider because Winding deformation and lead to the uneven influence to winding stress of ampere-turn distribution.The continuous exploration of adjoint researcher many years, with And the rapid development of electromagnetic arts numerical analysis techniques, finite element has become analysis Magnetic Leakage Field of Transformer and winding stress is most effective Method, and achieve a large amount of research achievement.But since transformer short circuit fault transient process is complicated, still it is difficult at present point Analyse the dynamic effects that winding deformation generates in short-circuit process.

In fact, transformer sudden short circuit failure, winding bears huge electromagnetic percussion, coil displacements, to change Magnetic fluxleakage distribution influences winding distribution of force, and feedback arrives structure field in turn, and whole process is a kind of dynamic and influenced each other Journey.Since dynamic and static state are there are a great difference, although transformer static check meets condition, but sudden short circuit failure still when Often wreck.

Therefore, the dynamic meter of internal magnetic flux leakage and winding stress during transformer short-circuit can accurately be parsed by finding one kind Calculation method reduces the spoilage of transformer for designing novel transformer, it is ensured that a significance is all had in the safe operation of power grid.

Summary of the invention

The purpose of the present invention is to provide a kind of dynamic force analysis methods of transformer winding under short trouble, solve Since transformer short circuit fault transient process is complicated, it is difficult to analyze in short-circuit process winding construction deformation to electromagnetic field and winding by The problem of dynamic effects that power generates.

The technical scheme adopted by the invention is that following the steps below:

1) under ANSYS Mechanical APDL software environment, PLANE13 two-dimensional magnetic-structure Coupling unit is selected, if It sets with UX, UY, AZ freedom degree, direct-coupling magnetic field and structure field, using two-dimensional axial symmetric modeling pattern;According to transformer reality Border size establishes two-dimensional axial symmetric model;

2) according to measured data, the material properties of Each part are distributed;

3) degree different subregions domain subdivision is refined according to model different parts, and controls mesh shape, avoided the occurrence of abnormal Become;

4) boundary condition of magnetic flux is set, magnetic flux Parallel Constraint is applied to iron core symmetry axis;

5) according to winding stress and deformation feature, displacement constraint is set, respectively the coboundary of fixation clip and supporting plate Lower boundary;

6) according to the fault current or physical fault recorder data of sudden short circuit outside analogue transformer, by short-circuit electricity Stream is converted to the equivalent current density of each line cake, and the positive and negative of numerical value represents current direction;

7) using the equivalent current density of each line cake as excitation, each load step is defined with time history, respectively to high and low pressure The corresponding line cake of winding loads;

8) transient state analyzing method is used, multi-load step Slow loading simultaneously solves;

9) ANSYS post-processing calculator and display, the meter of output inside transformer magnetic flux leakage, short-circuit force and stress are utilized Calculate result.

Further, model integral grid is sized to 0.02 in step 3, and winding and surrounding increase subdivision number of grid and set It is set to 0.015, entirety uses quadrangle grids.

Further, it is arranged after failure occurs in step 7 and continues 0.2s, is load step-length according to 1ms, respectively to high and low pressure The corresponding line cake of winding loads.

Further, in step 8, load sub-step is divided with 0.1ms, selection saves a calculated result every 5 sub-steps.

The beneficial effects of the invention are as follows can rapidly and accurately to winding during transformer short circuit fault in electromagnetic field and Dynamic stress characteristic under structure field influences each other is analyzed.

Detailed description of the invention

Fig. 1 is a kind of transformer model structure chart.

Specific embodiment

The present invention is described in detail With reference to embodiment.

Technical solution of the present invention the following steps are included:

1. PLANE13 two-dimensional magnetic-structure Coupling unit is selected under ANSYS Mechanical APDL software environment, if It sets with UX, UY, AZ freedom degree, direct-coupling magnetic field and structure field, using two-dimensional axial symmetric modeling pattern;According to transformer reality Border size establishes two-dimensional axial symmetric model, including iron core, high low pressure winding (line cake and cushion block), end circle, pressing plate etc., ignores angle The influence of the firmwares such as ring, bracket.It is as shown in Figure 1 a kind of structure of transformer.

2. distributing the material properties of Each part according to measured data --- electromagnetic property and architectural characteristic, including phase To magnetic conductivity, density, elasticity modulus, Poisson's ratio etc..The material properties parameter of transformer portion structure, as shown in table 1.

1 transformer material attribute list of table

3. model unit subdivision will directly influence computational accuracy, degree different subregions are refined according to model different parts Domain subdivision.Model integral grid is sized to 0.02, and winding and surrounding increase subdivision number of grid and be set as 0.015, entirety Using quadrangle grids, and mesh shape is controlled, avoids the occurrence of distortion.

4. the boundary condition of magnetic flux is arranged, magnetic flux Parallel Constraint is applied to iron core symmetry axis;

5. according to winding stress and deformation feature, displacement constraint is set, respectively the coboundary of fixation clip and supporting plate Lower boundary;

6. according to the fault current or physical fault recorder data of sudden short circuit outside analogue transformer, by short-circuit electricity Stream is converted to the equivalent current density of each line cake, and high and low pressure winding current is contrary, and the positive and negative of numerical value represents current direction, Inflow might as well be defined to be positive, outflow is negative;

7. defining each load step using the equivalent current density of each line cake as excitation with time history, failure being arranged Continue 0.2s afterwards, is load step-length according to 1ms, the corresponding line cake of high and low pressure winding is loaded respectively;

8. using transient state analyzing method, big deformation effect is opened, load sub-step is divided with 0.1ms, is selected every 5 sub-steps Save a calculated result;

9. using ANSYS preprocessor, magnetic flux leakage, short-circuit force, the stress distribution of the inside transformer of any time are exported The magnetic flux leakage and short-circuit force of figure and node change over time curve.

The above is only not to make limit in any form to the present invention to better embodiment of the invention System, any simple modification that embodiment of above is made according to the technical essence of the invention, equivalent variations and modification, Belong in the range of technical solution of the present invention.

Claims (1)

1. a kind of dynamic force analysis method of transformer winding under short trouble, it is characterised in that follow the steps below:
1) under ANSYS Mechanical APDL software environment, PLANE13 two-dimensional magnetic-structure Coupling unit, setting tool are selected There are UX, UY, AZ freedom degree, direct-coupling magnetic field and structure field, using two-dimensional axial symmetric modeling pattern;According to the practical ruler of transformer It is very little, establish two-dimensional axial symmetric model;
2) according to measured data, the material properties of Each part are distributed;
3) degree different subregions domain subdivision is refined according to model different parts, and controls mesh shape, avoid the occurrence of distortion;Mould Type integral grid is sized to 0.02, and winding and surrounding increase subdivision number of grid and be set as 0.015, and entirety uses quadrangle Subdivision;
4) boundary condition of magnetic flux is set, magnetic flux Parallel Constraint is applied to iron core symmetry axis;
5) according to winding stress and deformation feature, displacement constraint is set, the coboundary of fixation clip and supporting plate is following respectively Boundary;
6) according to the fault current or physical fault recorder data of sudden short circuit outside analogue transformer, short circuit current is rolled over It is counted as the equivalent current density of each line cake, the positive and negative of numerical value represents current direction;
7) using the equivalent current density of each line cake as excitation, each load step is defined with time history, respectively to high and low pressure winding Corresponding line cake load, setting failure occur after continue 0.2s, according to 1ms be load step-length, respectively to the phase of high and low pressure winding Line cake is answered to load;
8) transient state analyzing method is used, multi-load step Slow loading simultaneously solves, divides load sub-step with 0.1ms, select every 5 Sub-step saves a calculated result;
9) ANSYS post-processing calculator and display, the calculating knot of output inside transformer magnetic flux leakage, short-circuit force and stress are utilized Fruit.
CN201710030289.5A 2017-01-17 2017-01-17 A kind of dynamic force analysis method of transformer winding under short trouble CN106768559B (en)

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Publication number Priority date Publication date Assignee Title
CN107273614B (en) * 2017-06-15 2020-07-07 广东电科院能源技术有限责任公司 Method for calculating stress of 220kV transformer winding under short-circuit power

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CN103217579A (en) * 2012-12-28 2013-07-24 富阳市供电局 On-line monitoring system of transformer winding
CN103529352A (en) * 2013-10-29 2014-01-22 国家电网公司 On-line monitoring system capable of monitoring short-circuit force applied to running transformer
CN105224724A (en) * 2015-09-10 2016-01-06 云南电网有限责任公司电力科学研究院 The computing method of the displacement of a kind of Transformer Winding short-circuit impact and vibration acceleration
CN105260501A (en) * 2015-09-10 2016-01-20 云南电网有限责任公司电力科学研究院 Leakage magnetic field and winding stress calculation method during sudden shirt circuit of transformer
CN105973511A (en) * 2016-04-28 2016-09-28 华北电力大学 Distributed optical fiber-based transformer winding stress monitoring system

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Publication number Priority date Publication date Assignee Title
CN103217579A (en) * 2012-12-28 2013-07-24 富阳市供电局 On-line monitoring system of transformer winding
CN103529352A (en) * 2013-10-29 2014-01-22 国家电网公司 On-line monitoring system capable of monitoring short-circuit force applied to running transformer
CN105224724A (en) * 2015-09-10 2016-01-06 云南电网有限责任公司电力科学研究院 The computing method of the displacement of a kind of Transformer Winding short-circuit impact and vibration acceleration
CN105260501A (en) * 2015-09-10 2016-01-20 云南电网有限责任公司电力科学研究院 Leakage magnetic field and winding stress calculation method during sudden shirt circuit of transformer
CN105973511A (en) * 2016-04-28 2016-09-28 华北电力大学 Distributed optical fiber-based transformer winding stress monitoring system

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