CN115116308A - Partial discharge detection teaching system and method suitable for laboratory - Google Patents
Partial discharge detection teaching system and method suitable for laboratory Download PDFInfo
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Abstract
The invention discloses a partial discharge detection teaching system and a method suitable for a laboratory, wherein the system comprises: the sensor is arranged on equipment to be tested in a laboratory, is connected with acquisition equipment of the high-frequency partial discharge detector and is used for acquiring a high-frequency electric pulse signal generated by partial discharge; the information acquisition module is used for filtering the acquired high-frequency electric pulse signals to obtain pulse current information; the signal interface equipment is used for transmitting the obtained pulse current information to an upper computer; and the upper computer comprises control software, judgment software, an output unit and a graph display unit and is used for carrying out graph decomposition and analysis on the pulse current information. The invention can more intuitively understand the partial discharge detection principle, correctly and effectively analyze the detection result, and is suitable for laboratory teaching. The invention can be widely applied to the technical field of high-voltage experiment teaching.
Description
Technical Field
The invention relates to the technical field of high-voltage experiment teaching, in particular to a partial discharge detection teaching system and method suitable for a laboratory.
Background
Partial discharge detection is a widely applied detection method in a power system, and is to perform early warning on parts possibly having defects through a partial discharge detection technology and inform overhaul and maintenance personnel of treatment so as to avoid accidents.
At present, the research of an on-line analysis system based on partial discharge detection is not complete enough, the detection principle of the partial discharge detection technology is difficult to embody in laboratory teaching, and meanwhile, the detection result cannot be further deeply analyzed.
Disclosure of Invention
In order to solve at least one of the technical problems in the prior art to a certain extent, the present invention provides a partial discharge detection teaching system and method suitable for a laboratory.
The technical scheme adopted by the invention is as follows:
a partial discharge detection teaching system adapted for use in a laboratory, comprising:
the sensor is arranged on equipment to be tested in a laboratory, is connected with acquisition equipment of the high-frequency partial discharge detector and is used for acquiring a high-frequency electric pulse signal generated by partial discharge;
the information acquisition module is used for filtering the acquired high-frequency electric pulse signals to obtain pulse current information;
the signal interface equipment is used for transmitting the obtained pulse current information to an upper computer;
and the upper computer comprises control software, judgment software, an output unit and a graph display unit and is used for carrying out graph decomposition and analysis on the pulse current information.
Further, the sensors include a high-frequency partial discharge detection sensor and a phase information sensor;
the high-frequency partial discharge detection sensor is used for collecting high-frequency electric pulse signals;
the phase information sensor is used for collecting phase signals of pulse current.
Further, the control software is used for generating a PRPD spectrogram, a CFP spectrogram, a discharge oscillogram and a spectrogram according to the pulse current information;
and the judging software is used for judging whether partial discharge occurs according to a spectrogram generated by the pulse current information.
Further, the principle of the judgment software for judging the occurrence of the partial discharge is as follows:
1) discharge signals exist in the PRPD graph, and the discharge signals with the phase difference of 180 degrees are symmetrically distributed;
2) the discharge oscillogram has sharp pulses with steep rising edges, and the amplitude attenuation exceeds a preset value;
3) the spectrogram has aggregation in a low frequency band;
and if the acquired spectrograms meet the conditions, judging that the partial discharge occurs.
Further, if it is determined that the partial discharge occurs, the following data is read and output:
reading a horizontal axis numerical range of discharge signal aggregation from the CFP spectrogram, wherein the range is output as a discharge signal frequency range;
and reading a longitudinal axis value corresponding to the highest point of the waveform from the discharge waveform diagram, and outputting the value as a discharge signal peak value.
Further, if the partial discharge is judged to occur, the generated PRPD spectrogram, CPF spectrogram, discharge oscillogram and spectrogram are displayed, and partial discharge signals in the PRPD spectrogram and the CPF spectrogram are displayed in a preset format.
The other technical scheme adopted by the invention is as follows:
a control method for the partial discharge detection teaching system suitable for the laboratory, comprising the following steps:
collecting and collecting high-frequency electric pulse signals generated by partial discharge;
filtering the collected high-frequency electric pulse signals to obtain pulse current information;
and (4) carrying out map decomposition and analysis on the pulse current information.
Further, the performing map decomposition and analysis on the pulse current information includes:
and generating a PRPD spectrogram, a CFP spectrogram, a discharge oscillogram and a frequency spectrogram according to the pulse current information, and judging whether partial discharge occurs.
Further, the principle of determining whether or not partial discharge occurs is as follows:
1) discharge signals exist in the PRPD graph, and the discharge signals with the phase difference of 180 degrees are symmetrically distributed;
2) the discharge oscillogram has sharp pulses with steep rising edges, and the amplitude attenuation exceeds a preset value;
3) the spectrogram has aggregation in a low frequency band;
and if the acquired spectrograms meet the conditions, judging that the partial discharge occurs.
Further, the method also comprises the following steps:
if judging that the partial discharge occurs, reading the following data for outputting:
reading a horizontal axis numerical range of discharge signal aggregation from the CFP spectrogram, wherein the range is output as a discharge signal frequency range;
and reading a longitudinal axis value corresponding to the highest point of the waveform from the discharge waveform diagram, and outputting the value as a discharge signal peak value.
The invention has the beneficial effects that: the invention generates the PRPD spectrogram and the discharge spectrogram in the partial discharge detector by reading the high-frequency pulse current information, and analyzes the partial discharge phenomenon after transmitting the spectrograms to the computer teaching system, thereby being beneficial to more intuitively and accurately analyzing the result in the laboratory partial discharge teaching.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description is made on the drawings of the embodiments of the present invention or the related technical solutions in the prior art, and it should be understood that the drawings in the following description are only for convenience and clarity of describing some embodiments in the technical solutions of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a block diagram of a laboratory-adapted partial discharge detection teaching system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a flow structure of a partial discharge detection teaching system according to an embodiment of the present invention;
FIG. 3 is a flow chart illustrating steps of a control method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. The step numbers in the following embodiments are provided only for convenience of illustration, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Example one
As shown in fig. 1 and fig. 2, the present embodiment provides a partial discharge detection teaching system suitable for a laboratory, including:
the sensor is arranged on equipment to be tested in a laboratory, is connected with acquisition equipment of the high-frequency partial discharge detector and is used for acquiring a high-frequency electric pulse signal generated by partial discharge;
the information acquisition module is used for filtering the acquired high-frequency electric pulse signals to obtain pulse current information;
the signal interface equipment is used for transmitting the obtained pulse current information to an upper computer;
and the upper computer comprises control software, judgment software, an output unit and a graph display unit and is used for carrying out graph decomposition and analysis on the pulse current information.
Referring to fig. 2, the sensor high-frequency partial discharge sensor and the phase information sensor are connected with a high-frequency partial discharge acquisition device.
Referring to fig. 2, the information collection module is connected to the communication collection module through a LAN fiber to transmit pulse current information.
Referring to fig. 2, the information acquisition module is connected to the signal interface device through the LAN optical fiber, and the signal interface device is connected to the computer (i.e., upper computer) system through the LAN optical fiber. The data collected by the PDCheck is transmitted to the computer through the signal interface equipment.
The working principle of the system is as follows:
firstly, a high-frequency partial discharge detection sensor and a phase information sensor are installed on equipment to be detected in a laboratory and connected with acquisition equipment of a high-frequency partial discharge detector, and then high-frequency electric pulse signals generated by partial discharge can be acquired.
And secondly, transmitting the collected current information from the collecting equipment to connected computer equipment through a communication interface.
And thirdly, selecting a discharge signal to be collected through PDCheck control software on a computer, and generating a PRPD spectrogram, a CPF spectrogram, a discharge oscillogram and a spectrogram.
And fourthly, performing mathematical analysis on the four generated spectrograms by using a teaching system, judging whether partial discharge occurs, and if so, displaying partial characteristics of the partial discharge.
Example two
The embodiment provides a communication interface, wherein the high-frequency partial discharge detector PDCheck is connected with the communication interface through a LAN optical fiber, and the communication interface is connected with a computer system through the LAN optical fiber. The data collected by the PDCheck is transmitted to the computer through the communication interface.
The specific use of this example is as follows:
the communication interface is respectively connected with the high-frequency partial discharge signal acquisition equipment and the computer equipment through LAN optical fibers. The pulse current signal collected by the high-frequency partial discharge signal collecting equipment is transmitted to the computer system through the LAN optical cable by the signal interface. The PDCheck software on the computer system can control the on-off of the signal interface and can also process the data input by the signal interface.
EXAMPLE III
The embodiment provides a computer teaching system, which can analyze a PRPD spectrogram, a CPF spectrogram, a discharge oscillogram and a spectrogram generated by PDCheck control software, determine whether partial discharge occurs, analyze a discharge amount of the partial discharge and a discharge signal frequency distribution range when the partial discharge is determined to occur, and display each spectrogram feature of the partial discharge signal.
The specific use of this example is as follows:
when the teaching system runs, a PRPD spectrogram, a CPF spectrogram, a discharge oscillogram and a spectrogram generated by PDCheck control software can be read. When the spectrograms generated according to the same pulse signal are read, the teaching system analyzes each spectrogram and judges whether partial discharge occurs according to the following principle:
(1) discharge signals exist in the PRPD graph, and the discharge signals with the phase difference of 180 degrees are symmetrically distributed;
(2) the discharge waveform diagram has sharp pulses with steep rising edges and rapid amplitude attenuation;
(3) the spectrogram has obvious aggregation on a low frequency band;
if the spectrogram characteristics accord with the conditions, the partial discharge is preliminarily judged to occur.
When partial discharge is judged to occur, the teaching system extracts data of the CPD spectrogram input by the current signal again to obtain a frequency range (namely a horizontal axis coordinate range of the CPF spectrogram) with the most dense electric signal distribution; analyzing the input discharge oscillogram to obtain the voltage peak value of the pulse waveform (i.e. the ordinate of the highest point of the discharge oscillogram), and outputting the two data. And then, the teaching system performs highlighting coloring treatment on the partial discharge signals in the PRPD spectrogram and the CPF spectrogram, and displays the two processed spectrograms, the discharge oscillogram and the spectrogram together with the two data so as to perform laboratory teaching.
Example four
As shown in fig. 3, for the partial discharge detection teaching system of the first embodiment, this embodiment provides a control method, which includes the following steps:
s1, collecting and collecting high-frequency electric pulse signals generated by partial discharge;
s2, filtering the collected high-frequency electric pulse signals to obtain pulse current information;
and S3, carrying out map decomposition on the pulse current information and analyzing the pulse current information.
Wherein, in step S3, the method specifically includes:
and generating a PRPD spectrogram, a CFP spectrogram, a discharge oscillogram and a frequency spectrogram according to the pulse current information, and judging whether partial discharge occurs.
The principle of judging whether partial discharge occurs is as follows:
1) discharge signals exist in the PRPD graph, and the discharge signals with the phase difference of 180 degrees are symmetrically distributed;
2) the discharge oscillogram has sharp pulses with steep rising edges, and the amplitude attenuation exceeds a preset value;
3) the spectrogram has aggregation in a low frequency band;
and if the acquired spectrograms meet the conditions, judging that the partial discharge occurs.
As an optional implementation, the method further comprises the following steps:
if judging that the partial discharge occurs, reading the following data for outputting:
reading a horizontal axis numerical range of discharge signal aggregation from the CFP spectrogram, and outputting the range as a discharge signal frequency range;
and reading a longitudinal axis value corresponding to the highest point of the waveform from the discharge waveform diagram, and outputting the value as a discharge signal peak value.
Therefore, the method can understand the partial discharge detection principle more intuitively, carry out correct and effective analysis on the detection result, and is suitable for laboratory teaching.
In the foregoing description of the specification, reference to the description of "one embodiment/example," "another embodiment/example," or "certain embodiments/examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A partial discharge detection teaching system suitable for a laboratory, comprising:
the sensor is arranged on equipment to be tested in a laboratory, is connected with acquisition equipment of the high-frequency partial discharge detector and is used for acquiring a high-frequency electric pulse signal generated by partial discharge;
the information acquisition module is used for filtering the acquired high-frequency electric pulse signals to obtain pulse current information;
the signal interface equipment is used for transmitting the obtained pulse current information to an upper computer;
and the upper computer comprises control software, judgment software, an output unit and a graph display unit and is used for carrying out graph decomposition and analysis on the pulse current information.
2. The laboratory partial discharge detection teaching system according to claim 1, wherein the sensors include a high frequency partial discharge detection sensor and a phase information sensor;
the high-frequency partial discharge detection sensor is used for collecting high-frequency electric pulse signals;
the phase information sensor is used for acquiring a phase signal of the pulse current.
3. The laboratory partial discharge detection teaching system according to claim 1, wherein the control software is configured to generate a PRPD spectrogram, a CFP spectrogram, a discharge waveform map, and a spectrogram according to the pulse current information;
and the judging software is used for judging whether partial discharge occurs according to a spectrogram generated by the pulse current information.
4. The laboratory partial discharge detection teaching system according to claim 3, wherein the principle of the judgment software for judging the occurrence of partial discharge is as follows:
1) discharge signals exist in the PRPD graph, and the discharge signals with the phase difference of 180 degrees are symmetrically distributed;
2) the discharge oscillogram has sharp pulses with steep rising edges, and the amplitude attenuation exceeds a preset value;
3) the spectrogram has aggregation in a low frequency band;
and if the acquired spectrograms meet the conditions, judging that the partial discharge occurs.
5. The system for laboratory based teaching of partial discharge detection as claimed in claim 4, wherein if a decision is made that a partial discharge has occurred, the following data is read and output:
reading a horizontal axis numerical range of discharge signal aggregation from the CFP spectrogram, wherein the range is output as a discharge signal frequency range;
and reading a longitudinal axis value corresponding to the highest point of the waveform from the discharge waveform diagram, and outputting the value as a discharge signal peak value.
6. The laboratory partial discharge detection teaching system according to claim 4, wherein if it is determined that partial discharge occurs, the generated PRPD spectrogram, CPF spectrogram, discharge oscillogram, spectrogram are displayed, and partial discharge signals in the PRPD spectrogram and the CPF spectrogram are displayed in a preset format.
7. A control method of a partial discharge detection teaching system suitable for a laboratory according to any one of claims 1 to 6, comprising the steps of:
collecting and collecting high-frequency electric pulse signals generated by partial discharge;
filtering the collected high-frequency electric pulse signals to obtain pulse current information;
and (4) carrying out map decomposition and analysis on the pulse current information.
8. A control method according to claim 7, wherein said mapping and analyzing the pulse current information comprises:
and generating a PRPD spectrogram, a CFP spectrogram, a discharge oscillogram and a frequency spectrogram according to the pulse current information, and judging whether partial discharge occurs.
9. A control method according to claim 8, characterized in that the principle of judging whether partial discharge occurs is as follows:
1) discharge signals exist in the PRPD graph, and the discharge signals with the phase difference of 180 degrees are symmetrically distributed;
2) the discharge oscillogram has sharp pulses with steep rising edges, and the amplitude attenuation exceeds a preset value;
3) the spectrogram has aggregation in a low frequency band;
and if the acquired spectrograms meet the conditions, judging that the partial discharge occurs.
10. A control method according to claim 8, further comprising the steps of:
if judging that the partial discharge occurs, reading the following data for outputting:
reading a horizontal axis numerical range of discharge signal aggregation from the CFP spectrogram, wherein the range is output as a discharge signal frequency range;
and reading a longitudinal axis value corresponding to the highest point of the waveform from the discharge waveform diagram, and outputting the value as a discharge signal peak value.
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