CN111751676A - Detection system and method capable of distinguishing partial discharge signals of transformer and sleeve - Google Patents
Detection system and method capable of distinguishing partial discharge signals of transformer and sleeve Download PDFInfo
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- CN111751676A CN111751676A CN202010459681.3A CN202010459681A CN111751676A CN 111751676 A CN111751676 A CN 111751676A CN 202010459681 A CN202010459681 A CN 202010459681A CN 111751676 A CN111751676 A CN 111751676A
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- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title abstract description 7
- 239000003990 capacitor Substances 0.000 claims abstract description 25
- 230000005284 excitation Effects 0.000 claims abstract description 15
- 230000035939 shock Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of AC or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
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Abstract
The invention relates to the technical field of electrical equipment detection, and discloses a detection system and a method capable of distinguishing partial discharge signals of a transformer and a sleeve, wherein the detection system comprises an excitation source, a sleeve, a high-voltage capacitor, a sleeve end screen grounding wire, a first current sensor, a high-voltage capacitor grounding wire, a second current sensor, a distinguishing device and a transformer; the high-voltage capacitor is connected with the sleeve in parallel, and the high-voltage capacitor and the sleeve have equal capacitance; the first current sensor is used for acquiring a first current signal; the second current sensor is used for acquiring a second current signal; the distinguishing device is used for distinguishing whether the partial discharge signal comes from the transformer or the bushing according to the amplitude difference of the first current signal and the second current signal. The detection system and the detection method capable of distinguishing the partial discharge signals of the transformer and the sleeve can accurately distinguish the sources of the partial discharge signals.
Description
Technical Field
The invention relates to the technical field of electrical equipment detection, in particular to a system and a method capable of distinguishing partial discharge signals of a transformer and a sleeve.
Background
The power transformer is one of the important devices in the power grid, and the safe operation of the power transformer is related to the safety of the whole power grid. The transformer can bear various electric stresses such as power frequency, impact and the like in the operation and test process, and the electric stresses can possibly cause insulation faults when applied to the insulation. The most sensitive characteristic quantity for representing the insulation fault at present is partial discharge, and the current insulation state of the equipment can be judged according to the size and the property of the partial discharge, so that a basis is provided for state maintenance of the equipment.
In the operation and test of the transformer, the sources of partial discharge signals are two, one is from the transformer body and mainly comprises turn insulation and main insulation; the other is from the bushing, the sources of the two signals are often difficult to distinguish in practical detection, and even if partial discharge is found, it is difficult to judge whether the signal comes from the transformer or the bushing, which results in that it is difficult to find the fault point accurately and quickly.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is as follows: the detection system and the detection method capable of distinguishing the partial discharge signals of the transformer and the sleeve are provided, the sources of the partial discharge signals can be distinguished accurately, and accurate guidance is provided for follow-up fault treatment.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a detection system capable of distinguishing a partial discharge signal of a transformer from a partial discharge signal of a bushing, where the detection system includes an excitation source, a bushing, a high-voltage capacitor, a bushing end screen ground wire, a first current sensor, a high-voltage capacitor ground wire, a second current sensor, a distinguishing device, and a transformer; wherein,
the excitation source is used for providing voltage;
the sleeve is used for introducing the voltage provided by the excitation source into the interior of the transformer;
the high-voltage capacitor is connected with the sleeve in parallel, and the high-voltage capacitor and the sleeve have equal capacitance;
the first current sensor is sleeved on the sleeve tap grounding wire and used for acquiring a first current signal;
the second current sensor is sleeved on the high-voltage capacitor grounding wire and is used for acquiring a second current signal;
the first input end of the distinguishing device is connected with the output end of the first current sensor, the second input end of the distinguishing device is connected with the output end of the second current sensor, and the distinguishing device is used for distinguishing whether the partial discharge signal comes from the transformer or the bushing according to the amplitude difference of the first current signal and the second current signal.
As a preferred scheme, the detection system further includes a high-speed oscilloscope, a first input end of the high-speed oscilloscope is connected to the output end of the first current sensor, a second input end of the high-speed oscilloscope is connected to the output end of the second current sensor, and the high-speed oscilloscope is configured to display the first current signal and the second current signal.
As a preferable scheme, the bandwidth of the high-speed oscilloscope is 500 MHz.
As a preferable scheme, the sampling rate of the high-speed oscilloscope is 2.5 GHz.
Preferably, the first current sensor and the second current sensor are both high-frequency pulse current sensors.
As an improvement of the scheme, the frequency band of the first current sensor is 16 kHz-30 MHz, and the frequency band of the second current sensor is 16 kHz-30 MHz.
Preferably, the voltage waveform of the excitation source comprises a power frequency waveform, an impact waveform and a direct current waveform.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a detection method capable of distinguishing partial discharge signals of a transformer and a bushing, where the detection method is applied to the detection system according to any one of the first aspect, and the detection method includes:
acquiring a first current signal through a first current sensor;
acquiring a second current signal through a second current sensor;
acquiring the amplitude difference of the first current signal and the second current signal through a distinguishing device;
when the amplitude difference is larger than a preset threshold value, judging that the partial discharge signal comes from the sleeve;
and when the amplitude difference is not greater than a preset threshold value, judging that the partial discharge signal comes from the transformer.
Compared with the prior art, the system and the method for distinguishing the partial discharge signals of the transformer and the sleeve provided by the embodiment of the invention have the beneficial effects that: connecting a high-voltage capacitor with the same capacitance as the sleeve in parallel with the sleeve, connecting a distinguishing device on a sleeve end screen grounding lead and a high-voltage capacitor grounding lead, comparing the amplitude of two paths of signals, judging that a partial discharge signal comes from the transformer when the difference of the amplitudes of the two paths of signals is greater than a preset threshold value, and judging that the partial discharge signal comes from the sleeve when the difference of the amplitudes of the two paths of signals is greater than the preset threshold value; the source of the partial discharge signal can be accurately distinguished, so that subsequent detection processing with higher pertinence can be carried out on the equipment.
Drawings
In order to more clearly illustrate the technical features of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on the drawings without inventive labor.
FIG. 1 is a schematic diagram of a detection system for distinguishing partial discharge signals of a transformer and a bushing according to a preferred embodiment of the present invention;
FIG. 2 is an equivalent circuit diagram of a detection system capable of distinguishing partial discharge signals of a transformer and a bushing provided by the invention;
fig. 3 is a schematic flow chart of a detection method capable of distinguishing partial discharge signals of a transformer and a bushing according to a preferred embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Other embodiments, which can be derived by those skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of the present invention.
In the description of the present invention, it should be understood that the numbers themselves, such as "first", "second", etc., are used only for distinguishing the described objects, do not have a sequential or technical meaning, and cannot be understood as defining or implying the importance of the described objects.
Fig. 1 is a schematic structural diagram of a detection system capable of distinguishing partial discharge signals of a transformer and a bushing according to a preferred embodiment of the present invention.
As shown in fig. 1, the system includes a excitation source 1, a bushing 2, a high-voltage capacitor 3, a bushing end screen grounding wire 4, a first current sensor 5, a high-voltage capacitor grounding wire 6, a second current sensor 7, a distinguishing device 8 and a transformer 9; wherein,
the excitation source 1 is used for providing voltage, and the output end of the excitation source is connected with the input end of the sleeve 1;
the sleeve 2 is sleeved on the transformer 9, and the sleeve 2 is used for introducing the voltage provided by the excitation source 1 into the transformer 9;
the high-voltage capacitor 3 is connected with the sleeve 2 in parallel, and the high-voltage capacitor 3 and the sleeve 2 have equal capacitance;
the first current sensor 5 is sleeved on the sleeve end screen grounding wire 4, and the first current sensor 5 is used for acquiring a first current signal;
the second current sensor 7 is sleeved on the high-voltage capacitor grounding wire 6, and the second current sensor 7 is used for acquiring a second current signal;
a first input of the distinguishing device 8 is connected to the output of the first current sensor 5, a second input of the distinguishing device 8 is connected to the output of the second current sensor 7, and the distinguishing device 8 is configured to distinguish whether the partial discharge signal is from the transformer 9 or the bushing 2 according to the amplitude difference between the first current signal and the second current signal.
The distinguishing device 8 may be a Central Processing Unit (CPU) having a data processing function, or may be another general-purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or another Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
In order to more clearly illustrate the working principle of the present invention, fig. 2 shows an equivalent circuit diagram of the detection system provided by the present invention, wherein C1 is a transformer capacitor, C2 is a bushing capacitor, and C3 is a high-voltage capacitor. Since the capacitance of the transformer 9 and the capacitance of the bushing 2 are not equal, C1 and C2 are not equal; since the high-voltage capacitor 3 and the sleeve 2 have the same capacitance, C2 is equal to C3.
When partial discharge occurs in the transformer 9, the pulse current signal generated by the C1 passes through the C2 and the C3 and then forms a loop with the C1, and the amplitudes of the signals detected by the C2 loop and the C3 loop are the same because the C2 is equal to the C3; when partial discharge occurs in the casing 2, the pulse current signal generated by the C2 forms a loop through the C1 and the C3, and the amplitude of the pulse current signal flowing through the C2 loop is larger than that of the pulse current flowing through the C3 loop due to the shunting action of the C1.
Therefore, the embodiment of the present invention determines whether the partial discharge signal is from the transformer 9 or the bushing 2 according to the difference between the amplitudes of the signals detected by the C2 loop and the C3 loop.
It is understood that when the first current signal and the second current signal are 0, it indicates that there is no partial discharge signal.
In specific implementation, the distinguishing device 8 can receive the first current signal and the second current signal, calculate and obtain an amplitude difference between the first current signal and the second current signal, judge that the partial discharge signal comes from the transformer 9 or the bushing 2 according to the amplitude difference, and accurately distinguish the source of the partial discharge signal, so that subsequent detection processing with more pertinence is performed on the equipment.
In a preferred implementation, the system further includes a high-speed oscilloscope, a first input end of the high-speed oscilloscope is connected to the output end of the first current sensor 5, a second input end of the high-speed oscilloscope is connected to the output end of the second current sensor 7, and the high-speed oscilloscope is configured to display the first current signal and the second current signal.
In a preferred embodiment, the bandwidth of the high-speed oscilloscope is 500 MHz.
In a preferred embodiment, the sampling rate of the high speed oscilloscope is 2.5 GHz.
The high-speed oscilloscope can specifically display the first current signal and the second current signal in an interface, and a detector can calculate the amplitude difference between the first current signal and the second current signal according to the displayed result, so as to verify the detection result of the distinguishing device 8 and improve the accuracy of the detection result.
In a preferred embodiment, the first current sensor 5 and the second current sensor 7 are both high frequency pulsed current sensors.
The high-frequency pulse current sensor can be directly sleeved on an object to be measured to measure, is convenient to install, has excellent instant reaction capacity, good linearity and high precision, and can accurately acquire the first current signal and the second current signal so as to ensure the accuracy of a detection result.
In a preferred embodiment, the frequency band of the first current sensor 5 is 16kHz to 30MHz, and the frequency band of the second current sensor 7 is 16kHz to 30 MHz.
In a preferred embodiment, the voltage waveform of the excitation source 1 comprises a power frequency waveform, a shock waveform and a direct current waveform.
The excitation source 1 covers various voltage waveforms such as power frequency, impact, direct current and the like, and can detect partial discharge information when different voltages are input.
In summary, according to the detection system capable of distinguishing the partial discharge signals of the transformer and the bushing provided by the embodiment of the present invention, it is determined that the partial discharge signal is from the transformer 9 or the bushing 2 according to the amplitude difference between the first current signal and the second current signal, so that the source of the partial discharge signal can be accurately distinguished, and therefore, more targeted subsequent detection processing is performed on the device; and displaying the first current signal and the second current signal through a high-speed oscilloscope, so that the accuracy of the detection result can be improved.
Fig. 3 is a schematic flow chart of a detection method capable of distinguishing partial discharge signals of a transformer and a bushing according to a preferred embodiment of the present invention, which is applied to any one of the detection systems described above.
As shown in fig. 3, the method includes:
acquiring a first current signal through a first current sensor;
acquiring a second current signal through a second current sensor;
acquiring the amplitude difference of the first current signal and the second current signal through a distinguishing device;
when the amplitude difference is larger than a preset threshold value, judging that the partial discharge signal comes from the sleeve;
and when the amplitude difference is not greater than a preset threshold value, judging that the partial discharge signal comes from the transformer.
It should be noted that, in actual operation of the device, when the partial discharge signal is from the transformer, the amplitude difference between the first current signal and the second current signal is not equal to 0, but equal to about 5% of the amplitude of the first current signal.
Therefore, in a preferred embodiment, the preset threshold is 5% of the amplitude of the first current signal.
In specific implementation, when partial discharge occurs, the first current sensor and the second current sensor can detect current signals, the distinguishing device calculates and obtains the amplitude difference of the two current signals according to the two current signals, and when the amplitude difference is larger than 5% of the amplitude of the first current signal, the partial discharge signal is judged to come from the sleeve; and when the amplitude difference is not larger than 5% of the amplitude of the first current signal, judging that the partial discharge signal is from the transformer.
The detection method capable of distinguishing the partial discharge signals of the transformer and the sleeve provided by the embodiment of the invention can accurately distinguish the sources of the partial discharge signals, so that more targeted subsequent detection processing is performed on equipment.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be noted that, for those skilled in the art, several equivalent obvious modifications and/or equivalent substitutions can be made without departing from the technical principle of the present invention, and these obvious modifications and/or equivalent substitutions should also be regarded as the scope of the present invention.
Claims (8)
1. A detection system capable of distinguishing partial discharge signals of a transformer and a sleeve is characterized by comprising an excitation source, a sleeve, a high-voltage capacitor, a sleeve end screen grounding wire, a first current sensor, a high-voltage capacitor grounding wire, a second current sensor, a distinguishing device and a transformer; wherein,
the excitation source is used for providing voltage;
the sleeve is used for introducing the voltage provided by the excitation source into the interior of the transformer;
the high-voltage capacitor is connected with the sleeve in parallel, and the high-voltage capacitor and the sleeve have equal capacitance;
the first current sensor is sleeved on the sleeve tap grounding wire and used for acquiring a first current signal;
the second current sensor is sleeved on the high-voltage capacitor grounding wire and is used for acquiring a second current signal;
the first input end of the distinguishing device is connected with the output end of the first current sensor, the second input end of the distinguishing device is connected with the output end of the second current sensor, and the distinguishing device is used for distinguishing whether the partial discharge signal comes from the transformer or the bushing according to the amplitude difference of the first current signal and the second current signal.
2. The detection system according to claim 1, further comprising a high-speed oscilloscope, wherein a first input end of the high-speed oscilloscope is connected to the output end of the first current sensor, a second input end of the high-speed oscilloscope is connected to the output end of the second current sensor, and the high-speed oscilloscope is configured to display the first current signal and the second current signal.
3. The detection system of claim 2, wherein the high speed oscilloscope has a bandwidth of 500 MHz.
4. The detection system of claim 2, wherein the high speed oscilloscope has a sample rate of 2.5 GHz.
5. The detection system of claim 1, wherein the first current sensor and the second current sensor are both high frequency pulsed current sensors.
6. The detection system according to claim 5, wherein the frequency band of the first current sensor is 16kHz to 30MHz, and the frequency band of the second current sensor is 16kHz to 30 MHz.
7. The detection system of claim 1, wherein the voltage waveform of the excitation source comprises a power frequency waveform, a shock waveform, a direct current waveform.
8. A detection method capable of distinguishing partial discharge signals of a transformer and a bushing, which is applied to the detection system according to any one of claims 1 to 7, the detection method comprising:
acquiring a first current signal through a first current sensor;
acquiring a second current signal through a second current sensor;
acquiring the amplitude difference of the first current signal and the second current signal through a distinguishing device;
when the amplitude difference is larger than a preset threshold value, judging that the partial discharge signal comes from the sleeve;
and when the amplitude difference is not greater than a preset threshold value, judging that the partial discharge signal comes from the transformer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114252749A (en) * | 2022-02-28 | 2022-03-29 | 国网湖北省电力有限公司检修公司 | Transformer partial discharge detection method and device based on multiple sensors |
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