CN111103481A - Method for identifying magnetizing inrush current of transformer - Google Patents

Method for identifying magnetizing inrush current of transformer Download PDF

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Publication number
CN111103481A
CN111103481A CN201911262892.1A CN201911262892A CN111103481A CN 111103481 A CN111103481 A CN 111103481A CN 201911262892 A CN201911262892 A CN 201911262892A CN 111103481 A CN111103481 A CN 111103481A
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Prior art keywords
transformer
period
current
voltage side
current signal
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姚晖
吴保重
张东
岳雷
欧阳鸣
杜平
苏建明
王文婷
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State Grid Corp of China SGCC
Tongling Power Supply Co of State Grid Anhui Electric Power Co Ltd
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State Grid Corp of China SGCC
Tongling Power Supply Co of State Grid Anhui Electric Power Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • H02H7/045—Differential protection of transformers

Abstract

The invention relates to the field of power transformer relay protection, in particular to a method for identifying transformer excitation inrush current. The method comprises the steps of obtaining current signals of each side of the transformer, carrying out fast Fourier transform on the current signals to obtain an effective value of current, calculating integral in front and back half periods in a period if the effective value of the current is a set value, calculating asymmetry, and judging whether the current output by the transformer is excitation inrush current or not in a delayed mode. And carrying out corresponding time delay judgment according to the fuzzy interval so as to judge whether the current output by the transformer is magnetizing inrush current or fault current, wherein the magnetizing inrush current is not the fault current, so that the magnetizing inrush current is prevented from being judged as the fault current, and whether the transformer fails or not can be accurately identified.

Description

Method for identifying magnetizing inrush current of transformer
Technical Field
The invention relates to the field of power transformer relay protection, in particular to a method for identifying transformer excitation inrush current.
Background
The safe and stable operation of the large power transformer is related to the safe operation of the power grid. For a long time, transformer differential protection is widely applied to power transformer protection, and magnetizing inrush current influences the action performance of the differential protection. The current main excitation inrush current detection algorithm comprises the following steps: harmonic discrimination method, waveform symmetry method, and magnetic braking principle.
The existing method for identifying the magnetizing inrush current can judge the magnetizing inrush current as fault current, so that the accuracy of identifying the magnetizing inrush current is reduced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a transformer magnetizing inrush current identification method, which can improve the accuracy of magnetizing inrush current identification.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for identifying magnetizing inrush current of a transformer comprises the following steps:
s1, acquiring a high-voltage side current signal I1(n), a medium-voltage side current signal I2(n) and a low-voltage side current signal I2(n) of the transformer, wherein n is a time sequence sampling serial number;
s2, fast Fourier transform is respectively carried out on the high-voltage side current signal I1(n), the medium-voltage side current signal I2(n) and the low-voltage side current signal I3(n) to obtain the current effective value I of the high-voltage side current signal I1(n)Height ofThe effective current value I of the medium-voltage side current signal I2(n)InThe effective current value I of the low-voltage side current signal I3(n)Is low in；
S3, if IHeight ofGreater than the high pressure side set value and IInGreater than the set value at the medium pressure side and IIs low inIf the pressure is greater than the low pressure side set value, the process proceeds to step S4;
s4, for the high-voltage side current signal I1(n), one period TBecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I1a, and the integration of the second half period is marked as I1 b; for a period T of the medium-voltage side current signal I2(n)BecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I2a, and the integration of the second half period is marked as I2 b; for a low-voltage side current signal I3(n) in one period TBecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I3a, and the integration of the second half period is marked as I3 b; one period T of I1(n)BecomeOne period T of I2(n)BecomeAnd one period T of I3(n)BecomeAll n are in the same period;
s5, calculating the high-voltage side current signal I1(n) in one period T through I1a and I1bBecomeInner asymmetry K1; calculating the current signal I2(n) of the medium-voltage side in one period T through I2a and I2bBecomeInner asymmetry K2; calculating the low-voltage side current signal I3(n) in one period T through I3a and I3bBecomeInner asymmetry K3; the asymmetry is used for identifying whether the current output by the transformer is magnetizing inrush current or not;
s6, repeating the steps S4-S5 in the time period of the n time delay T1, and if any one of K1, K2 and K3 after the time delay is more than or equal to 1, enabling the current output by the transformer to be excitation inrush current;
or repeating the steps S4-S5 within the time period of n time delay T2, and if any one of K1, K2 and K3 after the time delay is more than or equal to A1 and less than 1, the current output by the transformer is magnetizing inrush current;
or repeating the steps S4-S5 within the time period of n time delay T3, and if any one of K1, K2 and K3 after the time delay is more than or equal to A2 and less than A1, the current output by the transformer is magnetizing inrush current;
or repeating the steps S4-S5 within the time period of n time delay T4, and if any one of K1, K2 and K3 after the time delay is greater than or equal to A3 and smaller than A2, the current output by the transformer is excitation;
wherein T1< T2< T3< T4, A1> A2> A3.
Further, the step of calculating the asymmetry of each transformer in step S5 is as follows:
Figure BDA0002312051620000021
wherein max (I1a, I1b) is the maximum value of I1a and I1b,
Figure BDA0002312051620000022
absolute value of (d);
Figure BDA0002312051620000023
wherein max (I2a, I2b) is the maximum value of I2a and I2b,
Figure BDA0002312051620000024
is composed of
Figure BDA0002312051620000025
Absolute value of (d);
Figure BDA0002312051620000031
wherein max (I3a, I3b) is the maximum value of I3a and I3b,
Figure BDA0002312051620000032
is composed of
Figure BDA0002312051620000033
Absolute value of (a).
Further, in the present invention,
Figure BDA0002312051620000034
wherein T is the sampling rate of the relay protection device installed on the transformer。
Further, the high-voltage side current signal I1(n) is obtained by a current transformer installed on the high-voltage side of the transformer; the medium-voltage side current signal I2(n) is obtained by a current transformer installed on the medium-voltage side of the transformer; the low-voltage side current signal I3(n) is obtained by a current transformer installed on the low-voltage side of the transformer.
Further, the value of a1 was 1, the value of a2 was 0.8, and the value of A3 was 0.5.
The invention has the following beneficial effects:
(1) the method measures the symmetry degree of a waveform by utilizing the ratio of the absolute value of the difference value of the integral absolute values of the front half period and the back half period of a sine periodic function to the integral maximum value in the front half period and the back half period, simultaneously divides the asymmetry degree into an asymmetric interval, and judges whether the current output by the transformer is excitation surge current or fault current according to the corresponding time delay judgment of the fuzzy interval, wherein the excitation surge current is not the fault current, so that the excitation surge current is prevented from being judged as the fault current, and whether the transformer fails or not can be accurately identified.
(2) The invention utilizes the principle that the waveform of the front half period and the back half period in one period is symmetrical and adopts the half period integral addition principle to judge the waveform symmetry; the fuzzy delay processing strategy can effectively avoid the waveform asymmetry generated at the moment of primary equipment failure, can also effectively identify the possibility of waveform asymmetry under the condition of normal load variation, can also timely and quickly identify the differential protection current distortion of the power transformer, provides an effective judgment standard for the correct action of the differential protection equipment of the transformer, and provides an effective identification method for the identification of the excitation inrush current of the differential protection.
Drawings
FIG. 1 is a schematic diagram of a transformer of the present invention;
FIG. 2 is a flow chart of the present invention;
FIG. 3 is a diagram of the magnetizing inrush current waveform of the present invention;
fig. 4 is a calculated graph of asymmetrical pairs of magnetizing inrush current waveforms according to the present invention.
Detailed Description
The technical scheme of the invention is clearly and completely described below by combining the embodiment and the attached drawings of the specification. 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.
Examples
A method for identifying transformer magnetizing inrush current, as shown in fig. 2, includes the following steps:
s1, as shown in fig. 1, a current transformer obtains a high-voltage side current signal I1(n), a medium-voltage side current signal I2(n), and a low-voltage side current signal I2(n) of the transformer from the relay protection device, where n is a time sequence sampling serial number.
S2, fast Fourier transform is respectively carried out on the high-voltage side current signal I1(n), the medium-voltage side current signal I2(n) and the low-voltage side current signal I3(n) to obtain the current effective value I of the high-voltage side current signal I1(n)Height ofThe effective current value I of the medium-voltage side current signal I2(n)InThe effective current value I of the low-voltage side current signal I3(n)Is low in。
S3, if IHeight ofGreater than the high pressure side set value and IInGreater than the set value at the medium pressure side and IIs low inIf the current is greater than the low-voltage set value, the step S4 is performed, otherwise, the current output by the transformer is not identified.
S4, for the high-voltage side current signal I1(n), one period TBecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I1a, and the integration of the second half period is marked as I1 b; for a period T of the medium-voltage side current signal I2(n)BecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I2a, and the integration of the second half period is marked as I2 b; for a low-voltage side current signal I3(n) in one period TBecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I3a, and the integration of the second half period is marked as I3 b; one period T of I1(n)BecomeOne period T of I2(n)BecomeAnd one period T of I3(n)BecomeAre all the same as nAnd (4) one period.
In this example
Figure BDA0002312051620000051
Where T is the sampling rate of the relay protection device installed on the transformer.
S5, calculating the high-voltage side current signal I1(n) in one period T through I1a and I1bBecomeInner asymmetry K1; calculating the current signal I2(n) of the medium-voltage side in one period T through I2a and I2bBecomeInner asymmetry K2; calculating the low-voltage side current signal I3(n) in one period T through I3a and I3bBecomeInner asymmetry K3; the asymmetry is used for identifying whether the current output by the transformer is magnetizing inrush current or not.
Figure BDA0002312051620000052
Wherein max (I1a, I1b) is the maximum value of I1a and I1b,
Figure BDA0002312051620000053
is composed of
Figure BDA0002312051620000054
Absolute value of (d);
Figure BDA0002312051620000055
wherein max (I2a, I2b) is the maximum value of I2a and I2b,
Figure BDA0002312051620000056
is composed of
Figure BDA0002312051620000057
Absolute value of (d);
Figure BDA0002312051620000058
wherein max (I3a, I3b) is the maximum value of I3a and I3b,
Figure BDA0002312051620000059
is composed of
Figure BDA00023120516200000510
Absolute value of (a).
S6, repeating the steps S4-S5 in the time period of the n time delay T1, and if any one of K1, K2 and K3 after the time delay is more than or equal to 1, enabling the current output by the transformer to be excitation inrush current;
or repeating the steps S4-S5 within the time period of n time delay T2, and if any one of K1, K2 and K3 after the time delay is more than or equal to A1 and less than 1, the current output by the transformer is magnetizing inrush current;
or repeating the steps S4-S5 within the time period of n time delay T3, and if any one of K1, K2 and K3 after the time delay is more than or equal to A2 and less than A1, the current output by the transformer is magnetizing inrush current;
or repeating the steps S4-S5 within the time period of n time delay T4, and if any one of K1, K2 and K3 after the time delay is greater than or equal to A3 and smaller than A2, the current output by the transformer is excitation;
wherein T1< T2< T3< T4, A1> A2> A3.
In this example, the value of T1 was 0.02s, the value of T2 was 0.04s, the value of T3 was 0.08s, the value of T4 was 0.1s, the value of a1 was 1, the value of a2 was 0.8, and the value of A3 was 0.5.
As shown in fig. 3, a typical magnetizing inrush current waveform of this embodiment is shown, and two adjacent half cycles are observed to be asymmetric and biased to one side.
Fig. 4 is a graph showing an asymmetric pair of typical magnetizing inrush current waveforms in this embodiment, and it can be seen that the calculated value can well identify the magnetizing inrush current by the method of the present invention, and the identification rate is high.

Claims (5)

1. A method for identifying transformer magnetizing inrush current is characterized by comprising the following steps:
s1, acquiring a high-voltage side current signal I1(n), a medium-voltage side current signal I2(n) and a low-voltage side current signal I2(n) of the transformer, wherein n is a time sequence sampling serial number;
s2, fast Fourier transform is respectively carried out on the high-voltage side current signal I1(n), the medium-voltage side current signal I2(n) and the low-voltage side current signal I3(n) to obtain the current effective value I of the high-voltage side current signal I1(n)Height ofThe effective current value I of the medium-voltage side current signal I2(n)InThe effective current value I of the low-voltage side current signal I3(n)Is low in；
S3, if IHeight ofGreater than the high pressure side set value and IInGreater than the set value at the medium pressure side and IIs low inIf the pressure is greater than the low pressure side set value, the process proceeds to step S4;
s4, for the high-voltage side current signal I1(n), one period TBecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I1a, and the integration of the second half period is marked as I1 b; for a period T of the medium-voltage side current signal I2(n)BecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I2a, and the integration of the second half period is marked as I2 b; for a low-voltage side current signal I3(n) in one period TBecomeThe first half period and the second half period in the period are respectively subjected to time integration, the integration of the first half period is marked as I3a, and the integration of the second half period is marked as I3 b; one period T of I1(n)BecomeOne period T of I2(n)BecomeAnd one period T of I3(n)BecomeAll n are in the same period;
s5, calculating the high-voltage side current signal I1(n) in one period T through I1a and I1bBecomeInner asymmetry K1; calculating the current signal I2(n) of the medium-voltage side in one period T through I2a and I2bBecomeInner asymmetry K2; calculating the low-voltage side current signal I3(n) in one period T through I3a and I3bBecomeInner asymmetry K3; the asymmetry is used for identifying whether the current output by the transformer is magnetizing inrush current or not;
s6, repeating the steps S4-S5 in the time period of the n time delay T1, and if any one of K1, K2 and K3 after the time delay is more than or equal to 1, enabling the current output by the transformer to be excitation inrush current;
or repeating the steps S4-S5 within the time period of n time delay T2, and if any one of K1, K2 and K3 after the time delay is more than or equal to A1 and less than 1, the current output by the transformer is magnetizing inrush current;
or repeating the steps S4-S5 within the time period of n time delay T3, and if any one of K1, K2 and K3 after the time delay is more than or equal to A2 and less than A1, the current output by the transformer is magnetizing inrush current;
or repeating the steps S4-S5 within the time period of n time delay T4, and if any one of K1, K2 and K3 after the time delay is greater than or equal to A3 and smaller than A2, the current output by the transformer is excitation;
wherein T1< T2< T3< T4, A1> A2> A3.
2. The method for identifying the transformer magnetizing inrush current of claim 1, wherein the step of calculating the asymmetry degrees of the transformer in step S5 is as follows:
Figure FDA0002312051610000021
wherein max (I1a, I1b) is the maximum value of I1a and I1b,
Figure FDA0002312051610000022
is composed of
Figure FDA0002312051610000023
Absolute value of (d);
Figure FDA0002312051610000024
wherein max (I2a, I2b) is the maximum value of I2a and I2b,
Figure FDA0002312051610000025
is composed of
Figure FDA0002312051610000026
Absolute value of (d);
Figure FDA0002312051610000027
wherein max (I3a, I3b) is the maximum value of I3a and I3b,
Figure FDA0002312051610000028
is composed of
Figure FDA0002312051610000029
Absolute value of (a).
3. The method for identifying the transformer magnetizing inrush current of claim 1, wherein:
Figure FDA00023120516100000210
where T is the sampling rate of the relay protection device installed on the transformer.
4. The method for identifying the transformer magnetizing inrush current of claim 1, wherein: the high-voltage side current signal I1(n) is obtained by a current transformer installed on the high-voltage side of the transformer; the medium-voltage side current signal I2(n) is obtained by a current transformer installed on the medium-voltage side of the transformer; the low-voltage side current signal I3(n) is obtained by a current transformer installed on the low-voltage side of the transformer.
5. The method for identifying transformer magnetizing inrush current of claim 1, 2, 3 or 4, characterized in that: the value of A1 was 1, the value of A2 was 0.8, and the value of A3 was 0.5.
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