AU2021103407A4 - Method for determining radial deformation of transformer winding - Google Patents
Method for determining radial deformation of transformer winding Download PDFInfo
- Publication number
- AU2021103407A4 AU2021103407A4 AU2021103407A AU2021103407A AU2021103407A4 AU 2021103407 A4 AU2021103407 A4 AU 2021103407A4 AU 2021103407 A AU2021103407 A AU 2021103407A AU 2021103407 A AU2021103407 A AU 2021103407A AU 2021103407 A4 AU2021103407 A4 AU 2021103407A4
- Authority
- AU
- Australia
- Prior art keywords
- winding
- short
- phase
- determining
- circuit reactance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000004804 winding Methods 0.000 title claims abstract description 461
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000008859 change Effects 0.000 claims abstract description 95
- 230000016507 interphase Effects 0.000 claims abstract description 7
- 230000007423 decrease Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- 230000004044 response Effects 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101150051106 SWEET11 gene Proteins 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/22—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in capacitance
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
OF THE DISCLOSURE
Embodiments of the present disclosure relate to a method for determining radial deformation of
a transformer winding, including: determining, by using every two of an external winding, a middle
winding, and an internal winding as a winding pair, short-circuit reactance voltages of phase A to A,
phase B to B, and phase C to C between two windings in each winding pair; determining short
circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the
two windings in each winding pair according to the short-circuit reactance voltages; and
determining, according to the short-circuit reactance voltage change rules, whether the middle
winding and the internal winding have radial deformation; and when the middle winding and the
internal winding have radial deformation, determining a degree of the radial deformation according
to the short-circuit reactance voltage change rules. The method first determines whether there is
deformation, and then determines a degree of the deformation, which is simple and easy to operate,
and achieves high accuracy by determining interphase reactance voltages.
-1/4
DRAWINGS
Determine, by using every two of an external winding,
a middle winding, and an internal winding as a
winding pair, short-circuit reactance voltages of phase 101
A to A, phase B to B, and phase C to C between two
windings in each winding pair
Determine short-circuit reactance voltage change rules
of phase A to A, phase B to B, and phase C to C 102
between the two windings in each winding pair
according to the short-circuit reactance voltages
Determine, according to the short-circuit reactance
voltage change rules, whether the middle winding and
the internal winding have radial deformation; and
when the middle winding and the internal winding 103
have radial deformation, determine a degree of the
radial deformation according to the short-circuit
reactance voltage change rules
FIG. 1
3A12
H A23 B,2A 12 B
H A13 H
Internal Middle H External
winding winding winding
W1 W1
Rp23
RFi 2
Rpis ?
R,121
FIG. 2
-2/3
20 -eactance change
R?4@ctance change
- -W-M rntr
10
CU
40
0.01 0.02 0.03 0.04 0.05 0.06
Equivalent deformation amount of winding W2
FIG. 3
First Second Third
determining determining determining
unit 401 unit 402 unit 403
Apparatus for determining radial deformation of a
transformer winding
FIG. 4
Description
-1/4
Determine, by using every two of an external winding, a middle winding, and an internal winding as a winding pair, short-circuit reactance voltages of phase 101 A to A, phase B to B, and phase C to C between two windings in each winding pair
Determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C 102 between the two windings in each winding pair according to the short-circuit reactance voltages
Determine, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding 103 have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules FIG. 1
3A12
H A 23 B,2A 12 B H A13 H Internal Middle H External winding winding winding
W1 W1
Rp 2 3
RFi 2 Rpis ? R,121 FIG. 2
-2/3
20 -eactance change R?4@ctance change - -W-M rntr 10
40 CU
0.01 0.02 0.03 0.04 0.05 0.06 Equivalent deformation amount of winding W2 FIG. 3
First Second Third determining determining determining unit 401 unit 402 unit 403
Apparatus for determining radial deformation of a transformer winding
FIG. 4
[01] Embodiments of the present disclosure relate to the technical field of deformation determining, and in particular, to a method for determining radial deformation of a transformer winding.
[02] The on-site diagnosis of winding deformation of a power transformer generally adopts a frequency response analysis method and a low-voltage short-circuit reactance method. The frequency response analysis method is susceptible to factors such as wiring methods, test instruments and transformer remanence, and easily causes misjudgment. In the actual application process, the frequency response analysis method is often used as supporting evidence for other test results. DL/T 1093 "Guide for Reactance Method to Detect and Diagnose Winding Deformation of Power Transformer" recommends two reactance detection methods for diagnosis: a vertical comparison method and a horizontal comparison method. The vertical comparison method is to compare a test value with a nameplate or a previous test value; the horizontal comparison method is to compare single-phase test values of the same winding pair. However, both methods are limited to analysis of a certain winding pair in terms of the horizontal or vertical reactance change, without considering the relationship between the change rules of the horizontal or vertical reactance of each winding pair. If the short-circuit reactance value of a certain winding pair marked on the transformer nameplate has an error or if there is an inherent difference among three phases of a winding, it often leads to misjudgment.
[03] To solve at least one problem in the prior art, at least one embodiment of the present disclosure provides a method for determining radial deformation of a transformer winding.
[04] According to a first aspect, an embodiment of the present disclosure provides a method for determining radial deformation of a transformer winding, where the transformer includes an external winding, a middle winding, and an internal winding, and each winding includes three phases: phase A, phase B, and phase C. The method includes: determining, by using every two inphase windings of the external winding, the middle winding, and the internal winding as a winding pair, short-circuit reactance voltage of each winding pair to A, B, and C; and determining short-circuit reactance voltage change rules of each winding pair to A, B, and C according to the short-circuit reactance voltage; and
[05] determining, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determining a degree of the radial deformation according to the short-circuit reactance voltage change rules.
[06] In some embodiments, the determining, by using every two inphase windings of the external winding, the middle winding, and the internal winding as a winding pair, short-circuit reactance voltage of each winding pair to A, B, and C includes:
[07] short-circuiting the middle winding from end to end, and connecting phase A, phase B, and phase C of the external winding to terminal A, terminal B, and terminal C of a low-voltage short circuit reactance test device respectively, to determine the short-circuit reactance voltage of a winding pair formed by the middle winding and the external winding;
[08] short-circuiting the internal winding from end to end, and connecting phase A, phase B, and phase C of the middle winding to terminal A, terminal B, and terminal C of the low-voltage short circuit reactance test device respectively, to determine the short-circuit reactance voltage of a winding pair formed by the middle winding and the internal winding; and
[09] short-circuiting the internal winding from end to end, and connecting phase A, phase B, and phase C of the external winding to terminal A, terminal B, and terminal C of the low-voltage short circuit reactance test device respectively, to determine the short-circuit reactance voltage of a winding pair formed by the internal winding and the external winding.
[10] In some embodiment, the determining short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages is implemented based on the following formula: AX%=[(X2 X1)/X1]x100, where X2 represents a current reactance voltage test value, and X1 represents a previous reactance voltage test value.
[11] In some embodiments, the determining, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation includes:
[12] determining that the middle winding has radial deformation if the short-circuit reactance voltage change rule of phase A to A, phase B to B, or phase C to C between the middle winding and the external winding is greater than or equal to a first preset threshold, and the short-circuit reactance voltage change rule of phase A to A, phase B to B, or phase C to C between the middle winding and the internal winding is less than or equal to a second preset threshold; and
[13] after determining that the middle winding has no radial deformation, determining that the internal winding has radial deformation if the short-circuit reactance voltage change rule of phase A to A, phase B to B, or phase C to C between the internal winding and the external winding is greater than or equal to a third preset threshold, and the short-circuit reactance voltage change rule of phase A to A, phaseBtoB,orphase C to C between the middle winding and the internal winding is greater than or equal to the second preset threshold; or
[14] after determining that the middle winding has radial deformation, determining that the internal winding has radial deformation if the short-circuit reactance voltage change rules of the phase A, phase B, and phase C of the internal winding and the external winding is greater than or equal to the third preset threshold.
[15] In some embodiments, the determining a degree of the radial deformation according to the short-circuit reactance voltage change rules includes:
[16] determining that the middle winding has visible deformation if the short-circuit reactance voltage change rule between the middle winding and the external winding is in a first preset range;
[17] determining that the middle winding has significant deformation if the short-circuit reactance voltage change rule between the middle winding and the external winding is in a second preset range;
[18] determining that the middle winding has severe deformation if the short-circuit reactance voltage change rule between the middle winding and the external winding is greater than or equal to a fourth preset threshold;
[19] determining that the internal winding has visible deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is in a third preset range;
[20] determining that the internal winding has significant deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is in a fourth preset range; and
[21] determining that the internal winding has severe deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is greater than or equal to a fifth preset threshold.
[22] In some embodiments, the determining interphase reactance voltage rates between the two windings in each winding pair further includes: as the amount of deformation of the middle winding increases, the short-circuit reactance voltages between the middle winding and the external winding increase progressively, and the short-circuit reactance voltages between the internal winding and the middle winding decrease progressively.
[23] According to a second aspect, an embodiment of the present disclosure provides an apparatus for determining radial deformation of a transformer winding, including: a first determining unit, configured to determine, by using every two of an external winding, a middle winding, and an internal winding as a winding pair, short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair; a second determining unit, configured to determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages; and a third determining unit, configured to determine, according to the short circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules.
[24] According to a third aspect, an embodiment of the present disclosure further provides a system for determining radial deformation of a transformer winding, including an apparatus for determining radial deformation of a transformer winding and a low-voltage short-circuit reactance test device, where the low-voltage short-circuit reactance test device is connected to a first determining unit, a second determining unit, and a third determining unit of the apparatus for determining radial deformation of a transformer winding; the first determining unit is configured to determine short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair; the second determining unit is configured to determine short circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages; and the third determining unit is configured to determine, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules.
[25] The embodiments of the present disclosure have the following advantages: whether the middle winding and the internal winding have radial deformation is determined according to the short-circuit reactance voltage change rules; and when the middle winding and the internal winding have radial deformation, a degree of the radial deformation is determined according to the short circuit reactance voltage change rules. Through the two-step analysis method, it isfirst determined, according to the short-circuit reactance voltage change rules, whether the radial deformation occurs, and then the deformation degree is determined according to the determined short-circuit reactance voltage change rules. The two-step analysis means first determining whether deformation occurs and then determining a deformation degree, which is easy to implement. Moreover, analysis is performed based on interphase reactance voltages, thus achieving high accuracy and avoiding the possibility of misjudgment.
[26] To describe the technical solutions in the embodiments of the present disclosure more clearly, the following briefly describes the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and persons of ordinary skill in the art may still derive other accompanying drawings from these accompanying drawings.
[27] FIG. 1 is a schematic diagram of a method for determining radial deformation of a transformer winding according to an embodiment of the present disclosure;
[28] FIG. 2 is a schematic structural diagram of a transformer winding according to an embodiment of the present disclosure;
[29] FIG. 3 shows reactance voltage change rules corresponding to different degrees of deformation of a middle winding of a transformer according to an embodiment of the present disclosure;
[30] FIG. 4 is a schematic diagram of an apparatus for determining radial deformation of a transformer winding according to an embodiment of the present disclosure; and
[31] FIG. 5 is a schematic diagram of a system for determining radial deformation of a transformer winding according to an embodiment of the present disclosure.
[32] To make the objectives, features and advantages of the present disclosure more comprehensible, the present disclosure is further described below with reference to the accompanying drawings and embodiments. It can be understood that the described embodiments are merely some rather than all of the embodiments of the present disclosure. The embodiments described herein are merely intended to explain the present disclosure, rather than to limit the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on the described embodiments of the present disclosure shall fall within the protection scope of the present disclosure.
[33] It should be noted that relational terms such as "first" and "second" in this specification are used only to distinguish an entity or operation from another entity or operation, and do not require or imply any actual relationship or sequence between the entities or operations.
[34] FIG. 1 is a schematic diagram of a method for determining radial deformation of a transformer winding according to an embodiment of the present disclosure.
[35] FIG. 2 is a schematic structural diagram of a transformer winding according to an embodiment of the present disclosure.
[36] With reference to FIG. 1 and FIG. 2, a method for determining radial deformation of a transformer winding is provided, where the transformer includes an external winding WI, a middle winding W2, and an internal winding W3, and each winding includes three phases: phase A, phase
B, and phase C. The method includes the following steps:
[37] Step 101: Determine, by using every two of the external winding WI, the middle winding W2, and the internal winding W3 as a winding pair, short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair.
[38] Step 102: Determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages.
[39] Step 103: Determine, according to the short-circuit reactance voltage change rules, whether the middle winding W2 and the internal winding W3 have radial deformation; and when the middle winding W2 and the internal winding W3 have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules.
[40] Specifically, the external winding WI is usually a high-voltage winding. As a three winding transformer is classified as a step-down transformer or a step-up transformer, for a step down transformer, the middle winding W2 is a medium-voltage winding, and for a step-up transformer, depending on different generator output voltages, the middle winding W2 may be a medium-low-voltage winding or a low-voltage winding to achieve effective transmission power. Therefore, the windings are collectively referred to as external winding WI, middle winding W2 and internal winding W3 according to distances from the windings to the core.
[41] In some embodiments, the determining, by using every two of the external winding WI, the middle winding W2, and the internal winding W3 as a winding pair, short-circuit reactance voltages of phase A to A, phaseBtoB,andphase C to C between two windings in each winding pair includes:
[42] short-circuiting the middle winding W2 from end to end, and connecting phase A, phase B, and phase C of the external winding WI to terminal A, terminal B, and terminal C of a low-voltage short-circuit reactance test device respectively, to determine the short-circuit reactance voltages between the middle winding W2 and the external winding W, which are denoted by XA2 % , XB120,
and Xc12% respectively;
[43] short-circuiting the internal winding W3 from end to end, and connecting phase A, phase B, and phase C of the middle winding W2 to terminal A, terminal B, and terminal C of the low-voltage short-circuit reactance test device respectively, to determine the short-circuit reactance voltages between the middle winding W2 and the internal winding W3, which are denoted by XA23%, XB230, and XC23% respectively; and
[44] short-circuiting the internal winding W3 from end to end, and connecting phase A, phase B, and phase C of the external winding WI to terminal A, terminal B, and terminal C of the low voltage short-circuit reactance test device respectively, to determine the short-circuit reactance voltages between the internal winding W3 and the external winding WI, which are denoted by XA13%, XB13%, and Xcl3% respectively.
[45] In some embodiment, the determining short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages is implemented based on the following formula: AX%=[(X2 X1)/X1]x100, where X2 represents a current reactance voltage test value, and X1 represents a previous reactance voltage test value.
[46] Specifically, AXA2% is calculated based on the following formula:
[471 AXA12%=[(XA12-2-XA12-1)/XA12-1 X100
[48] where AXA2% represents a reactance voltage change rate between phase-A external winding and phase-A middle winding, XA12-2 represents a current test value of the reactance voltage between phase-A external winding and phase-A middle winding, and XA12-1 is a previous test value of the reactance voltage between phase-A external winding and phase-A middle winding.
[49] For example, the previous test value XA2-1 of the reactance voltage between phase-A external winding and phase-A middle winding of a transformer is 01.4, and the current test value XA2-2 of the reactance voltage between phase-A external winding and phase-A middle winding is 0.16. In this case, AXA12o=[(0.16-0.14)/0.14]x 100=14.28.
[50] In some embodiments, the determining, according to the short-circuit reactance voltage change rules, whether the middle winding W2 and the internal winding W3 have radial deformation includes:
[51] It is determined that the middle winding W2 has radial deformation if the short-circuit reactance voltage change rule of phase A to A, phase B to B, or phase C to C between the middle winding W2 and the external winding WI is greater than or equal to a first preset threshold, and the short-circuit reactance voltage change rule of phase A to A, phase B to B, or phase C to C between the middle winding and the internal winding is less than or equal to a second preset threshold.
[52] Specifically, the first preset threshold is 1.6, and the second preset threshold is 2.0.
[53] If AXA12%>1.6 and AXA23%2.0, or
[54] AXB12%>1.6 and AXB12%<2.0, or
[55] AXC12%>1.6 and AXC12%<2.0,
[56] it is determined that the middle winding W2 has radial deformation.
[57] After it is determined that the middle winding has no radial deformation, it is determined that the internal winding has radial deformation if the short-circuit reactance voltage change rule of phase Ato A, phaseBtoB,orphase C to C between the internal winding W3 and the external winding WI is greater than or equal to a third preset threshold, and the short-circuit reactance voltage change rule of phase A to A, phase B to B, or phase C to C between the middle winding W2 and the internal winding W3 is greater than or equal to the second preset threshold.
[58] Specifically, the third preset threshold is 1, and the second preset threshold is 2.0.
[59] If AXA13%01 and AXA23%2.0, or
[60] AXB13%>1 and AXB23%> 2.0, or
[61] AXcl3%>1 and AXC23%> 2.0
[62] it is determined that the internal winding W3 has radial deformation.
[63] After it is determined that the middle winding has no radial deformation, it is determined that the internal winding has radial deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is greater than or equal to the third preset threshold.
[64] Specifically, the third preset threshold is 1.
[65] If AXA13%l1 or AXA23%l1 or AXc 3%>1,it 1 is determined that the internal winding W3 has radial deformation.
[66] In some embodiments, the determining a degree of the radial deformation according to the short-circuit reactance voltage change rules includes:
[67] It is determined that the middle winding W2 has visible deformation if the short-circuit reactance voltage change rule between the middle winding W2 and the external winding WI is in a first preset range.
[68] It is determined that the middle winding W2 has significant deformation if the short-circuit reactance voltage change rule between the middle winding W2 and the external winding WI is in a second preset range.
[69] It is determined that the middle winding W2 has severe deformation if the short-circuit reactance voltage change rule between the middle winding W2 and the external winding WI is greater than or equal to a fourth preset threshold.
[70] Specifically, when the middle winding W2 has radial deformation, the first preset range is 1.6 to 2, and if 1.6<AXA12%or AXB12% or AXcl2%<2, the middle winding W2 has visible deformation; the second preset range is 2 to 5, and if 2AXA12% or AXB12% or AXc 1 2%<5, the middle winding W2 has significant deformation; the fourth preset threshold is 5, and if 5AXA120 or AXB12%or AX12%, the middle winding W2 has severe deformation.
[71] It is determined that the internal winding W3 has visible deformation if the short-circuit reactance voltage change rule between the internal winding W3 and the external winding WI is in a third preset range.
[72] It is determined that the internal winding W3 has significant deformation if the short-circuit reactance voltage change rule between the internal winding W3 and the external winding WI is in a fourth preset range.
[73] It is determined that the internal winding W3 has severe deformation if the short-circuit reactance voltage change rule between the internal winding W3 and the external winding WI is greater than or equal to a fifth preset threshold.
[74] Specifically, when the internal winding W3 has radial deformation, the third preset range is 1 to 1.6, and if1AXA13%o or AXB13% or AXC13%<l. 6 , the internal winding W3 has visible deformation; the fourth preset range is 1.6 to 3, and if 1.6<AXA13%or AXB13%or AXc13%< 3 , the internal winding W3 has significant deformation; the fifth preset threshold is 3, and if 3<AXA13% or
AXB13%or AX13%, the internal winding W3 has severe deformation.
[75] In some embodiments, with reference to FIG. 2, the determining interphase reactance voltage rates between the two windings in each winding pair further includes: as the amount of equivalent deformation of the middle winding W2 increases, the short-circuit reactance voltages between the middle winding W2 and the external winding WI increase progressively, and the short circuit reactance voltages between the internal winding W3 and the middle winding W2 decrease progressively.
[76] Specifically, a reactance voltage of a winding pair is proportional to its equivalent leakage area and inversely proportional to its equivalent reactance height. Assuming that the middle winding W2 has radial deformation, the middle winding W2 is displaced to the left by a certain distance from the solid line position shown in FIG. 1. Assuming that the radial width of the winding remains unchanged, without loss of generality, it will inevitably lead to an increase in the equivalent leakage area between WI and W2, while the equivalent leakage area of the space occupied by the radial width Bq2 of the winding W2 decreases; since Rp12>Rp2 and the leakage distribution of the space occupied by Bq2 is triangular, a multiplication factor of 1/3 is required for calculation of the equivalent leakage area. Therefore, when the middle winding W2 has radial deformation, the interphase reactance voltage between the middle winding W2 and the external winding WI increases; similarly, the interphase reactance voltage between the middle winding W2 and the internal winding W3 decreases.
[77] FIG. 3 shows reactance voltage change rules corresponding to different degrees of deformation of a middle winding of a 180,000 kVA three-winding power transformer. With reference to FIG. 3:
[78] If the middle winding W2 has radial deformation, the short-circuit reactance voltages between the middle winding W2 and the external winding WIincrease.
[79] If the middle winding W2 has radial deformation, the short-circuit reactance voltages between the internal winding W3 and the middle winding W2 decrease progressively.
[80] FIG. 4 is a schematic diagram of an apparatus for determining radial deformation of a transformer winding according to an embodiment of the present disclosure; and
[811 With reference to FIG. 4, an embodiment of the present disclosure further provides an apparatus for determining radial deformation of a transformer winding, including:
[82] a first determining unit 401, configured to determine, by using every two of the external winding, the middle winding, and the internal winding as a winding pair, short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair;
[83] a second determining unit 402, configured to determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages; and
[84] a third determining unit 403, configured to determine, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules.
[85] FIG. 5 is a schematic diagram of a system for determining radial deformation of a transformer winding according to an embodiment of the present disclosure.
[86] An embodiment of the present disclosure further provides a system for determining radial deformation of a transformer winding, including an apparatus 501 for determining radial deformation of a transformer winding and a low-voltage short-circuit reactance test device 502. The low-voltage short-circuit reactance test device is connected to a first determining unit, a second determining unit, and a third determining unit of the apparatus for determining radial deformation of a transformer winding. The first determining unit is configured to determine, by using every two of the external winding, the middle winding, and the internal winding as a winding pair, short circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair; the second determining unit is configured to determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages; and the third determining unit is configured to determine, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules.
[87] In addition, those skilled in the art can understand that, although some embodiments herein include some features included in other embodiments but not other features, a combination of features of different embodiments falls within the scope of the present disclosure and forms a different embodiment.
[88] Although the embodiments of the present disclosure are described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present disclosure. These modifications and variations shall fall within the scope defined by the claims.
Claims (5)
1. A method for determining radial deformation of a transformer winding, wherein the transformer comprises an external winding, a middle winding, and an internal winding, and each winding comprises three phases: phase A, phase B, and phase C, and the method comprises: determining, by using every two of the external winding, the middle winding, and the internal winding as a winding pair, short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair; determining short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages; and determining, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determining a degree of the radial deformation according to the short-circuit reactance voltage change rules.
2. The method according to claim 1, wherein the determining, by using every two of the external winding, the middle winding, and the internal winding as a winding pair, short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair comprises: short-circuiting the middle winding from end to end, and connecting phase A, phase B, and phase C of the external winding to terminal A, terminal B, and terminal C of a low-voltage short circuit reactance test device respectively, to determine the short-circuit reactance voltages between the middle winding and the external winding; short-circuiting the internal winding from end to end, and connecting phase A, phase B, and phase C of the middle winding to terminal A, terminal B, and terminal C of the low-voltage short circuit reactance test device respectively, to determine the short-circuit reactance voltages between the middle winding and the internal winding; and short-circuiting the internal winding from end to end, and connecting phase A, phase B, and phase C of the external winding to terminal A, terminal B, and terminal C of the low-voltage short circuit reactance test device respectively, to determine the short-circuit reactance voltages between the internal winding and the external winding.
3. The determination method according to claim 1, wherein the determining short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages is implemented based on the following formula: AX%=[(X2-X1)/X1]x100, wherein X2 represents a current reactance voltage test value, and X1 represents a previous reactance voltage test value; wherein the determining, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation comprises: determining that the middle winding has radial deformation if the short-circuit reactance voltages between the middle winding and the external winding is greater than or equal to a first preset threshold, and the short-circuit reactance voltages between the middle winding and the internal winding is less than or equal to a second preset threshold; and after determining that the middle winding has radial deformation, determining that the internal winding has radial deformation if the short-circuit reactance voltages between the internal winding and the external winding is greater than or equal to a third preset threshold, and the short-circuit reactance voltages between the middle winding and the internal winding is greater than or equal to the second preset threshold; or after determining that the middle winding has no radial deformation, determining that the internal winding has radial deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is greater than or equal to the third preset threshold; wherein the determining a degree of the radial deformation according to the short-circuit reactance voltage change rules comprises: determining that the middle winding has visible deformation if the short-circuit reactance voltage change rule between the middle winding and the external winding is in a first preset range; determining that the middle winding has significant deformation if the short-circuit reactance voltage change rule between the middle winding and the external winding is in a second preset range; determining that the middle winding has severe deformation if the short-circuit reactance voltage change rule between the middle winding and the external winding is greater than or equal to a fourth preset threshold; determining that the internal winding has visible deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is in a third preset range; determining that the internal winding has significant deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is in a fourth preset range;and determining that the internal winding has severe deformation if the short-circuit reactance voltage change rule between the internal winding and the external winding is greater than or equal to a fifth preset threshold; wherein the determining interphase reactance voltage rates of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages further comprises: as the amount of deformation of the middle winding increases, the short-circuit reactance voltages between the middle winding and the external winding increase progressively, and the short-circuit reactance voltages between the internal winding and the middle winding decrease progressively.
4. An apparatus for determining radial deformation of a transformer winding, comprising: a first determining unit, configured to determine, by using every two of an external winding, a middle winding, and an internal winding as a winding pair, short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair; a second determining unit, configured to determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages, and determine a reactance voltage change rate between the two windings in each winding pair; and a third determining unit, configured to determine, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules.
5. A system for determining radial deformation of a transformer winding, comprising an apparatus for determining radial deformation of a transformer winding and a low-voltage short circuit reactance test device, wherein the low-voltage short-circuit reactance test device is connected to a first determining unit, a second determining unit, and a third determining unit of the apparatus for determining radial deformation of a transformer winding; the first determining unit is configured to determine short-circuit reactance voltages of phase A to A, phase B to B, and phase C to C between two windings in each winding pair; the second determining unit is configured to determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C between the two windings in each winding pair according to the short-circuit reactance voltages, and determine a reactance voltage change rate between the two windings in each winding pair; and the third determining unit is configured to determine, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules.
－1/4－
DRAWINGS 17 Jun 2021
Determine, by using every two of an external winding, a middle winding, and an internal winding as a winding pair, short-circuit reactance voltages of phase 101 A to A, phase B to B, and phase C to C between two windings in each winding pair 2021103407
Determine short-circuit reactance voltage change rules of phase A to A, phase B to B, and phase C to C 102 between the two windings in each winding pair according to the short-circuit reactance voltages
Determine, according to the short-circuit reactance voltage change rules, whether the middle winding and the internal winding have radial deformation; and when the middle winding and the internal winding 103 have radial deformation, determine a degree of the radial deformation according to the short-circuit reactance voltage change rules FIG. 1
Internal Middle External winding winding winding
FIG. 2
－2/3－ 17 Jun 2021
Reactance change rate Reactance change rate Reactance change rate 2021103407
Equivalent deformation amount of winding W2 FIG. 3
First Second Third determining determining determining unit 401 unit 402 unit 403
Apparatus for determining radial deformation of a transformer winding
FIG. 4
－3/3－ 17 Jun 2021
Apparatus for determining Low-voltage short-circuit radial deformation of a reactance test device transformer winding 502 501 2021103407
System for determining radial deformation of a transformer winding
FIG. 5
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021103407A AU2021103407A4 (en) | 2021-06-17 | 2021-06-17 | Method for determining radial deformation of transformer winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021103407A AU2021103407A4 (en) | 2021-06-17 | 2021-06-17 | Method for determining radial deformation of transformer winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021103407A4 true AU2021103407A4 (en) | 2021-08-05 |
Family
ID=77076122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021103407A Ceased AU2021103407A4 (en) | 2021-06-17 | 2021-06-17 | Method for determining radial deformation of transformer winding |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021103407A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114859274A (en) * | 2022-07-08 | 2022-08-05 | 成都工百利自动化设备有限公司 | Transformer winding deformation online monitoring method and electronic device |
-
2021
- 2021-06-17 AU AU2021103407A patent/AU2021103407A4/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114859274A (en) * | 2022-07-08 | 2022-08-05 | 成都工百利自动化设备有限公司 | Transformer winding deformation online monitoring method and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7873496B2 (en) | Method and device for fault detection in an N-winding three-phase power transformer | |
| CN110661238B (en) | Multi-terminal flexible direct-current power distribution network protection method based on current-limiting inductive voltage | |
| RU2540851C2 (en) | Method for selection of short-circuited phase and determination of short circuit type | |
| CN108318762B (en) | Method for judging power frequency ferromagnetic resonance of voltage transformer | |
| CN109633366A (en) | A kind of one-phase earthing failure in electric distribution network phase-selecting method and phase selection device | |
| AU2021103407A4 (en) | Method for determining radial deformation of transformer winding | |
| CN112615359A (en) | AC-DC hybrid power grid pilot protection method and system based on voltage waveform comparison | |
| CN110081809B (en) | Method for determining radial deformation of transformer winding | |
| CN112014772B (en) | Zero-fault detection method and device, storage medium and power distribution gateway | |
| CN109557398B (en) | Power distribution network fault diagnosis method and device | |
| CN113655377B (en) | Breaker failure fault detection method and device for pumped storage generator motor | |
| CN112054492B (en) | Phase failure detection method, device, storage medium and distribution gateway | |
| CN114879023A (en) | Converter valve stage fault positioning method and system based on transverse and longitudinal state difference between valves | |
| CN110661239B (en) | Method for reclosing single-pole grounding fault of flexible direct-current power grid | |
| CN111983377A (en) | Fault judgment method and device for high-voltage direct-current transmission line | |
| CN111913135B (en) | Method for identifying deformation faults of transformer winding by Newton iteration method | |
| RU2772289C1 (en) | Method for longitudinal differential protection of a transformer | |
| CN112684289B (en) | Non-full-phase operation state identification method and device, electrical protection equipment and medium | |
| CN109814002B (en) | Method and system for acquiring fault severity of same-tower multi-circuit power transmission system | |
| CN112269049B (en) | Power distribution network capacitance-to-ground current measurement method and system | |
| CN108666976B (en) | Differential protection correction method and system for transformer | |
| CN112865048B (en) | Protection method and device for alternating current-direct current series-parallel power transmission system and terminal equipment | |
| CN110030919B (en) | Method for determining radial deformation of transformer winding | |
| CN212780991U (en) | Nuclear phase equipment | |
| EP3783763A1 (en) | Longitudinal differential protection method for transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |