CN108490379B - Self-excited oscillation wave-based transformer winding wave process calibration method - Google Patents
Self-excited oscillation wave-based transformer winding wave process calibration method Download PDFInfo
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Abstract
The application provides a transformer winding wave process checking method based on self-excited oscillation waves, wherein a transformer leakage reactance or an oscillation loop formed by an excitation impedance, a capacitance type sleeve, a winding grounding and a stray capacitance between windings is utilized, a neutral point of a star winding of a transformer is rapidly grounded after direct-current voltage is applied to the neutral point connection, so that a self-excited oscillation waveform is obtained, and the accuracy of a transformer winding wave model can be accurately judged by comparing the actual self-excited oscillation waveform of the transformer with a transformer winding wave model.
Description
Technical Field
The application relates to the field of transformer equipment, in particular to a transformer winding wave process calibration method based on self-excited oscillation waves.
Background
Under the action of immersion shock waves such as lightning shock full waves and lightning shock clipping waves, initial potential distribution, potential gradients and shock response characteristics of each coil cake of the transformer winding play an important role in transformer design and fault diagnosis. When a surge voltage wave penetrates a certain winding of the transformer, a very high induced voltage, i.e. a wave process between the windings of the transformer, may occur on the other windings of the transformer. Under certain conditions, the induced overvoltage between the transformer windings may exceed the insulation level of the low voltage winding, causing insulation breakdown accidents; similarly, under certain conditions, when a shock wave invades the low-voltage winding, a high induced overvoltage is also generated on the high-voltage winding, which may exceed the insulation level thereof, and cause insulation breakdown accidents.
At present, the process modeling of the winding wave of the power transformer with the voltage of 110kV or more is widely applied to the design and fault diagnosis of the power transformer, and the main modeling simulation software of the process modeling is MATLAB, PSCAD, EMTP/ATP and the like. However, after the wave process model is established, there is no method for checking the accuracy of the model, the winding wave process model established by numerous scientific research institutions and universities cannot be accurately judged, and the insulation performance of the transformer winding structure designed by the winding wave process model is poor.
Disclosure of Invention
The application provides a transformer winding wave process calibration method based on self-excited oscillation waves, and aims to solve the problems that no method for checking the accuracy of a model exists after a wave process model is established, winding wave process models established by numerous scientific research institutions and universities cannot be judged accurately, and the insulation performance of a transformer winding structure designed by the winding wave process model is poor.
The application provides a transformer winding wave process calibration method based on self-excited oscillation waves, which comprises the following steps:
step S1: constructing a self-excited oscillation waveform loop of the transformer to be tested;
step S2: grounding the neutral point of the three-phase transformer in the self-excited oscillation waveform loop of the transformer to be measured, and measuring the self-excited oscillation waveform of the three-phase transformer;
step S3: obtaining a first oscillation frequency and a first oscillation time according to the self-excited oscillation waveform of the three-phase transformer;
step S4: establishing a transformer winding wave model corresponding to the self-excited oscillation waveform loop of the transformer to be tested;
step S5: grounding the transformer winding wave model after overvoltage is input to the transformer winding wave model to obtain a self-excited oscillation waveform of the input end or the output end of the transformer winding wave model;
step S6: obtaining a second oscillation frequency and a second oscillation time according to the self-oscillation waveform of the input end or the output end of the transformer winding wave model;
step S7: comparing the second oscillation frequency with a first oscillation frequency, comparing the second oscillation time with the first oscillation time, judging whether a preset condition is met, and if not, jumping to the step S4; and if so, the transformer winding wave model is accurate.
Further, the transformer self-excited oscillation waveform loop to be tested comprises a three-phase transformer, a first direct-current high-voltage generator, a first switch, a first waveform measurer, a voltage division capacitor and a stray capacitor to the ground;
the three high-voltage windings of the three-phase transformer are sequentially connected end to end, and one ends of the three low-voltage windings of the three-phase transformer are connected to one point to form a neutral point;
the first direct current high voltage generator is connected with the neutral point;
the neutral point is also grounded through a first switch;
the other ends of the three low-voltage windings of the three-phase transformer are grounded through a ground stray capacitor and a voltage division capacitor;
the first waveform measurer is connected between each ground stray capacitor and the corresponding voltage division capacitor;
each low-voltage winding is provided with a plurality of winding turn-to-turn stray capacitors at equal distance;
each low-voltage winding is grounded through a plurality of winding turn-to-turn stray capacitances.
Further, a protection resistor is arranged between the first direct current high voltage generator and the neutral point.
Further, the transformer winding wave model comprises a plurality of self-oscillation units which are connected in sequence;
each self-oscillation unit comprises a self-inductance, an equivalent ground capacitance and an equivalent winding turn-to-turn capacitance;
the self-inductance is connected with the equivalent winding turn-to-turn capacitance in parallel;
two ends of the equivalent winding turn-to-turn capacitor are grounded through equivalent ground capacitors respectively;
and the input end of the transformer winding wave model is connected with a second high-voltage direct-current power supply.
According to the technical scheme, the transformer winding wave process calibration method based on the self-excited oscillation wave is characterized in that an oscillation loop formed by leakage reactance or excitation impedance of a transformer and a capacitance type sleeve, a winding to ground and stray capacitance between turns of the winding is utilized, a neutral point of a star-shaped winding of the transformer is quickly grounded after direct-current voltage is applied to the neutral point connection, the self-excited oscillation wave form is obtained, and the accuracy of a transformer winding wave model can be accurately judged by comparing the actual self-excited oscillation wave form of the transformer with a transformer winding wave model.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a flow chart of a transformer winding wave process calibration method based on self-excited oscillation waves provided by the present application;
FIG. 2 is a schematic circuit diagram of a self-excited oscillation waveform loop of a transformer to be tested;
FIG. 3 is a self-excited oscillation waveform generated by a self-excited oscillation waveform loop of a transformer to be tested;
FIG. 4 is a schematic circuit diagram of a transformer winding wave model;
fig. 5 is a self-oscillating waveform generated by a transformer winding wave model.
Detailed Description
Referring to fig. 1, the present application provides a transformer winding wave process calibration method based on self-excited oscillation waves, including:
step S1: and constructing a self-excited oscillation waveform loop of the transformer to be tested.
Referring to fig. 2, the self-excited oscillation waveform loop of the transformer to be tested includes a three-phase transformer, a first direct-current high-voltage generator, a first switch, a first waveform measurer, a voltage-dividing capacitor C2, and a ground stray capacitor C0;
the three high-voltage windings of the three-phase transformer are sequentially connected end to end, and one end of each of the three low-voltage windings Lm of the three-phase transformer is connected to one point to form a neutral point;
the first direct current high voltage generator is connected with the neutral point;
the neutral point is also grounded through a first switch;
the other ends of three low-voltage windings Lm of the three-phase transformer are grounded through a stray capacitance C0 to ground and a voltage dividing capacitor C2;
the first wavemeter is connected between each stray capacitance to ground C0 and the corresponding voltage dividing capacitance C2;
a plurality of winding turn-to-turn stray capacitors C1 are arranged in equal distance of each low-voltage winding Lm;
each low-voltage winding Lm is grounded through a plurality of winding inter-turn stray capacitances C1.
Preferably, a protective resistor R is arranged between the first direct current high voltage generator and the neutral point.
Step S2: and grounding the neutral point of the three-phase transformer in the self-excited oscillation waveform loop of the transformer to be measured, and measuring the self-excited oscillation waveform of the three-phase transformer.
Grounding a neutral point of a three-phase transformer in the self-excited oscillation waveform loop of the transformer to be detected, namely closing a first switch, generating self-excited oscillation by using a ground stray capacitor C0, a voltage dividing capacitor C2, a capacitive sleeve and leakage reactance or excitation impedance of the three-phase transformer, and measuring the self-excited oscillation waveform generated by the three-phase transformer by using a first waveform measurer, as shown in fig. 3.
Step S3: and obtaining a first oscillation frequency and a first oscillation time according to the self-excited oscillation waveform of the three-phase transformer.
Step S4: and establishing a transformer winding wave model corresponding to the self-excited oscillation waveform loop of the transformer to be tested.
Referring to fig. 4, the transformer winding wave model includes a plurality of self-oscillating units connected in sequence;
each self-oscillation unit comprises a self-inductance L1, an equivalent ground capacitor C4 and an equivalent winding turn-to-turn capacitor C3;
the self-inductance L1 is connected in parallel with the equivalent winding turn-to-turn capacitance C3;
two ends of the equivalent winding inter-turn capacitor C3 are respectively grounded through an equivalent ground capacitor C4.
The input end of the transformer winding wave model is connected with a second high-voltage direct-current power supply, the second high-voltage direct-current power supply is grounded through a second switch K2, and the output end of the transformer winding wave model is connected with a second waveform measurer.
Step S5: and grounding the transformer winding wave model after overvoltage is input to the transformer winding wave model to obtain the self-excited oscillation waveform of the input end or the output end of the transformer winding wave model. Referring to fig. 4, after K2 is turned off, grounding after overvoltage is input by a transformer winding wave model can be realized. Overvoltage is input to the O end of the transformer winding wave model, and self-oscillation waveforms are measured from the X end.
Step S6: and obtaining a second oscillation frequency and a second oscillation time according to the self-oscillation waveform of the input end or the output end of the transformer winding wave model. The measurement results in a self-oscillating waveform, as shown in fig. 5.
Step S7: comparing the second oscillation frequency with a first oscillation frequency, comparing the second oscillation time with the first oscillation time, judging whether a preset condition is met, and if not, jumping to the step S4; and if so, the transformer winding wave model is accurate.
The preset condition may be a preset difference between the second oscillation frequency and the first oscillation frequency, and a preset difference between the second oscillation time and the first oscillation time, and if the preset condition is not met, the process jumps to step S4 again to re-establish the model.
According to the technical scheme, the transformer winding wave process calibration method based on the self-excited oscillation wave is characterized in that an oscillation loop formed by leakage reactance or excitation impedance of a transformer and a capacitance type sleeve, a winding to ground and stray capacitance between turns of the winding is utilized, a neutral point of a star-shaped winding of the transformer is quickly grounded after direct-current voltage is applied to the neutral point connection, the self-excited oscillation wave form is obtained, and the accuracy of a transformer winding wave model can be accurately judged by comparing the actual self-excited oscillation wave form of the transformer with a transformer winding wave model.
Claims (4)
1. A transformer winding wave process calibration method based on self-excited oscillation waves is characterized by comprising the following steps:
step S1: constructing a self-excited oscillation waveform loop of a transformer to be tested, wherein the self-excited oscillation waveform loop of the transformer to be tested comprises a three-phase transformer, a first direct-current high-voltage generator, a first switch, a first waveform measurer, a voltage-dividing capacitor and a ground stray capacitor;
step S2: grounding the neutral point of the three-phase transformer in the self-excited oscillation waveform loop of the transformer to be measured, and measuring the self-excited oscillation waveform of the three-phase transformer;
step S3: obtaining a first oscillation frequency and a first oscillation time according to the self-excited oscillation waveform of the three-phase transformer;
step S4: establishing a transformer winding wave model corresponding to the self-excited oscillation waveform loop of the transformer to be tested;
step S5: grounding the transformer winding wave model after overvoltage is input to the transformer winding wave model to obtain a self-excited oscillation waveform of the input end or the output end of the transformer winding wave model;
step S6: obtaining a second oscillation frequency and a second oscillation time according to the self-oscillation waveform of the input end or the output end of the transformer winding wave model;
step S7: comparing the second oscillation frequency with a first oscillation frequency, comparing the second oscillation time with the first oscillation time, judging whether a preset condition is met, and if not, jumping to the step S4; and if so, the transformer winding wave model is accurate.
2. The method of claim 1, wherein the transformer self-oscillation waveform loop under test comprises a three-phase transformer, a first direct current high voltage generator, a first switch, a first waveform measurer, a voltage division capacitor and a stray capacitance to ground;
the three high-voltage windings of the three-phase transformer are sequentially connected end to end, and one ends of the three low-voltage windings of the three-phase transformer are connected to one point to form a neutral point;
the first direct current high voltage generator is connected with the neutral point;
the neutral point is also grounded through a first switch;
the other ends of the three low-voltage windings of the three-phase transformer are grounded through a ground stray capacitor and a voltage division capacitor;
the first waveform measurer is connected between each ground stray capacitor and the corresponding voltage division capacitor;
each low-voltage winding is provided with a plurality of winding turn-to-turn stray capacitors at equal distance;
each low-voltage winding is grounded through a plurality of winding turn-to-turn stray capacitances.
3. The method of claim 2, wherein a protective resistor is provided between the first dc high voltage generator and the neutral point.
4. The method of claim 1, wherein the transformer winding wave model comprises a plurality of self-oscillating units connected in series;
each self-oscillation unit comprises a self-inductance, an equivalent ground capacitance and an equivalent winding turn-to-turn capacitance;
the self-inductance is connected with the equivalent winding turn-to-turn capacitance in parallel;
two ends of the equivalent winding turn-to-turn capacitor are grounded through equivalent ground capacitors respectively;
and the input end of the transformer winding wave model is connected with a second high-voltage direct-current power supply.
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| CN110161381B (en) * | 2019-04-29 | 2021-04-13 | 云南电网有限责任公司电力科学研究院 | Transformer bushing insulation damp state evaluation method based on oscillation waves |
| CN110161352B (en) * | 2019-04-29 | 2021-05-11 | 云南电网有限责任公司电力科学研究院 | Frequency response test device and method under condition of simulating turn-to-turn short circuit of transformer winding |
| CN112363031B (en) * | 2020-11-03 | 2023-04-11 | 国网重庆市电力公司电力科学研究院 | Method for measuring stray capacitance of primary side winding of electromagnetic voltage transformer |
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