CN212646874U - Detection system for partial discharge signals of transformer and sleeve - Google Patents
Detection system for partial discharge signals of transformer and sleeve Download PDFInfo
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- CN212646874U CN212646874U CN202020911255.4U CN202020911255U CN212646874U CN 212646874 U CN212646874 U CN 212646874U CN 202020911255 U CN202020911255 U CN 202020911255U CN 212646874 U CN212646874 U CN 212646874U
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- 239000003990 capacitor Substances 0.000 claims abstract description 21
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- 238000005070 sampling Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
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Abstract
The utility model relates to the technical field of electrical equipment detection, and discloses a system for detecting partial discharge signals of a transformer and a sleeve, which 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 high-speed oscilloscope and a transformer body; wherein, the output end of the excitation source is connected with the input end of the sleeve; the sleeve is sleeved on the transformer body; 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 a sleeve tap grounding wire; the second current sensor is sleeved on the high-voltage capacitor grounding wire; the first input end of the high-speed oscilloscope is connected with the output end of the first current sensor, and the second input end of the high-speed oscilloscope is connected with the output end of the second current sensor. The utility model provides a pair of transformer and sleeve pipe partial discharge signal's detecting system can detect the partial discharge signal.
Description
Technical Field
The utility model relates to an electrical equipment detects technical field, especially relates to a transformer and sleeve pipe partial discharge signal's detecting system.
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 two signals are often difficult to detect in practical detection, and even if partial discharge is found, it is difficult to judge whether the signal comes from the transformer body or the bushing to the bottom.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem who solves is: provided is a system for detecting partial discharge signals of a transformer and a bushing, which detects the partial discharge signals.
In order to solve the technical problem, an embodiment of the present invention provides a system for detecting partial discharge signals of a transformer and a bushing, where the system includes an excitation source, a bushing, a high-voltage capacitor, a bushing end screen grounding wire, a first current sensor, a high-voltage capacitor grounding wire, a second current sensor, a high-speed oscilloscope, and a transformer body; wherein the content of the first and second substances,
the output end of the excitation source is connected with the input end of the sleeve;
the sleeve is sleeved on the transformer body;
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;
the second current sensor is sleeved on the high-voltage capacitor grounding wire;
and a first input end of the high-speed oscilloscope is connected with the output end of the first current sensor, and a second input end of the high-speed oscilloscope is connected with the output end of the second current sensor.
Preferably, the first current sensor and the second current sensor are both high-frequency pulse current sensors.
Preferably, 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.
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 voltage waveform of the excitation source comprises a power frequency waveform, an impact waveform and a direct current waveform.
Compared with the prior art, the embodiment of the utility model provides a pair of detection system of transformer and sleeve pipe partial discharge signal, its beneficial effect lies in: observing current signals of the first current sensor and the second current sensor through a high-speed oscilloscope, judging whether a partial discharge signal exists or not, wherein when the current signals of the first current sensor and the second current sensor are both 0, the partial discharge signal does not exist, and when the current signals of the first current sensor and the second current sensor are not 0, the partial discharge signal exists, so that the partial discharge signal can be detected; further, according to the amplitude difference of the circuit signals of the two, whether the partial discharge signal comes from the transformer body or the bushing can also be judged.
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 obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a preferred embodiment of a system for detecting partial discharge signals of a transformer and a bushing according to the present invention;
fig. 2 is an equivalent circuit diagram of a detection system for partial discharge signals of a transformer and a bushing provided by 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 only for illustrating the present invention, but are not intended to limit the scope of the present invention. Based on the embodiment of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall all belong to the protection 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, and 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 preferred embodiment of a system for detecting partial discharge signals of a transformer and a bushing according to the present invention.
As shown in fig. 1, the detection system includes an 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 high-speed oscilloscope 8 and a transformer body 9; wherein the content of the first and second substances,
the output end of the excitation source 1 is connected with the input end of the sleeve 2;
the sleeve 2 is sleeved on the transformer body 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;
the second current sensor 7 is sleeved on the high-voltage capacitor grounding wire 6;
the first input end of the high-speed oscilloscope 8 is connected with the output end of the first current sensor 5, and the second input end of the high-speed oscilloscope 8 is connected with the output end of the second current sensor 7.
Specifically, the excitation source 1 is configured to provide a voltage, the bushing 2 is configured to introduce the voltage provided by the excitation source 1 into the transformer 9, the first current sensor 5 is configured to obtain a first current signal, the second current sensor 7 is configured to obtain a second current signal, and the high-speed oscilloscope 8 is configured to display the first current signal and the second current signal.
In order to more clearly illustrate the working principle of the present invention, fig. 2 shows the equivalent circuit diagram of the detection system provided by the present invention, in the diagram, C1 is transformer capacitance, C2 is bushing capacitance, and C3 is high-voltage capacitance. Since the capacitance of the transformer body 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.
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; when the first current signal and the second current signal are not 0, the partial discharge signal is present.
Further, when partial discharge occurs in the transformer body 9, the pulse current signal generated by C1 passes through C2 and C3, and then forms a loop with C1, and since C2 is equal to C3, the amplitude of the signal detected by the C2 loop and the C3 loop is the same; 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 body 9 or the bushing 2 according to the amplitude difference of the detected signals of the C2 loop and the C3 loop.
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.
In specific implementation, when partial discharge exists, the first current sensor 5 and the second current sensor 7 can detect current signals, the high-speed oscilloscope 8 specifically displays the amplitudes of the two current signals in an interface, a detection person can calculate and obtain the amplitude difference between the two current signals according to a display result, and when the amplitude difference is greater than 5% of the amplitude of the first current signal, the partial discharge signal is judged to be from the casing 2; when the amplitude difference is not larger than 5% of the amplitude of the first current signal, the partial discharge signal is judged to be from the transformer body 9.
In a preferred embodiment, the bandwidth of the high speed oscilloscope 8 is 500 MHz.
In a preferred embodiment, the high speed oscilloscope 8 has a sampling rate of 2.5 GHz.
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.
To sum up, the embodiment of the present invention provides a system for detecting partial discharge signals of a transformer and a bushing, which observes current signals of a first current sensor and a second current sensor through a high-speed oscilloscope, and can determine whether the partial discharge signals exist, when the current signals of the first current sensor and the second current sensor are both 0, it indicates that no partial discharge exists, and when the current signals of the first current sensor and the second current sensor are not 0, it indicates that partial discharge exists, so as to detect the partial discharge signals; furthermore, according to the amplitude difference of the circuit signals of the two, whether the partial discharge signal comes from the transformer body or the bushing can be judged, so that subsequent detection processing with higher pertinence is carried out on the equipment.
The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and it should be noted that, for those skilled in the art, a plurality of equivalent obvious modifications and/or equivalent replacements can be made without departing from the technical principle of the present invention, and these obvious modifications and/or equivalent replacements should also be regarded as the protection scope of the present invention.
Claims (6)
1. A detection system for 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 high-speed oscilloscope and a transformer body; wherein the content of the first and second substances,
the output end of the excitation source is connected with the input end of the sleeve;
the sleeve is sleeved on the transformer body;
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;
the second current sensor is sleeved on the high-voltage capacitor grounding wire;
and a first input end of the high-speed oscilloscope is connected with the output end of the first current sensor, and a second input end of the high-speed oscilloscope is connected with the output end of the second current sensor.
2. The system for detecting a transformer and bushing partial discharge signal of claim 1, wherein the first current sensor and the second current sensor are high frequency pulsed current sensors.
3. The system of claim 2, 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.
4. The transformer and bushing partial discharge signal detection system of claim 1, wherein the high speed oscilloscope has a bandwidth of 500 MHz.
5. The system for detecting the partial discharge signal of the transformer and the bushing as claimed in claim 1, wherein the sampling rate of the high-speed oscilloscope is 2.5 GHz.
6. The system for detecting the partial discharge signal of the transformer and the casing according to claim 1, wherein the voltage waveform of the excitation source comprises a power frequency waveform, an impact waveform and a direct current waveform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020911255.4U CN212646874U (en) | 2020-05-26 | 2020-05-26 | Detection system for partial discharge signals of transformer and sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020911255.4U CN212646874U (en) | 2020-05-26 | 2020-05-26 | Detection system for partial discharge signals of transformer and sleeve |
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| Publication Number | Publication Date |
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| CN212646874U true CN212646874U (en) | 2021-03-02 |
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| CN202020911255.4U Expired - Fee Related CN212646874U (en) | 2020-05-26 | 2020-05-26 | Detection system for partial discharge signals of transformer and sleeve |
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| CN (1) | CN212646874U (en) |
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2020
- 2020-05-26 CN CN202020911255.4U patent/CN212646874U/en not_active Expired - Fee Related
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