CN109581161B - Portable partial discharge detection system of 10kV transformer based on oscillatory wave - Google Patents
Portable partial discharge detection system of 10kV transformer based on oscillatory wave Download PDFInfo
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- CN109581161B CN109581161B CN201811555057.2A CN201811555057A CN109581161B CN 109581161 B CN109581161 B CN 109581161B CN 201811555057 A CN201811555057 A CN 201811555057A CN 109581161 B CN109581161 B CN 109581161B
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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
- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention discloses a portable partial discharge detection system of a 10kV transformer based on oscillation waves, which comprises a direct-current power supply DC, a transformer T and detection impedance; the positive electrode of the direct-current power supply DC is connected with two bidirectional power electronic switches IGBT which are connected in series in a reverse direction through a rheostat RW; one end of a primary winding of the transformer T is connected with the two-way power electronic switch IGBT, and the other end of the primary winding of the transformer T is connected with the negative electrode of the direct-current power supply DC; the detection impedance is connected in parallel with the secondary winding of the transformer T and is used for detecting a partial discharge signal of the secondary winding. The invention charges the primary winding of the transformer through the current-limiting resistor by the direct current low voltage to form the stable current, then switches off the switch to enable the switch to generate resonance with the capacitors connected in parallel with the two ends of the switch and form the damped oscillation wave, and the oscillation wave voltage with higher amplitude is generated on the secondary side of the transformer due to electromagnetic coupling, and the on-site application of the detection of the partial discharge of the transformer by the direct current oscillation wave is realized by measuring the amplitude of the output voltage of the secondary side and the partial discharge waveform.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of high voltage, and relates to a portable partial discharge detection system for a 10kV transformer based on oscillation waves.
[ background of the invention ]
In a circuit containing a capacitor and an inductor, if the capacitor and the inductor are connected in series, it may occur for some small period of time: the voltage of the capacitor is gradually increased, while the current is gradually reduced; at the same time, the current of the inductor gradually increases, and the voltage of the inductor gradually decreases. And in another very small time period: the voltage of the capacitor is gradually reduced, while the current is gradually increased; at the same time, the current of the inductor is gradually reduced, and the voltage of the inductor is gradually increased. The voltage can be increased to a positive maximum value, the voltage can be reduced to a negative maximum value, and the direction of the current can also change in the positive and negative directions in the process, namely the circuit generates electric oscillation.
The partial discharge phenomenon refers to a discharge phenomenon that a part of an insulation structure is discharged due to field intensity generated at a certain position during operation of an insulation system of electrical equipment due to problems of design, installation and the like, but a stable discharge channel is not formed between conductors to which voltage is applied. Partial discharge is generated in a partial space of an electrode system, a stable discharge channel is not formed between insulating media generally, and the current microscopic explanation of the partial discharge mainly includes two types of electron impact ionization theory and streamer theory.
A series of complex phenomena such as light, electricity, heat, chemistry and the like are caused in the partial discharge process, and partial discharge detection technologies researched based on the characteristics are mainly divided into an electrical method and a non-electrical method. The electric measurement method mainly comprises a pulse current method, an ultrahigh frequency detection method and the like.
1) Pulse current method. The earliest and widely-used one, which utilizes a current sensor or a detection impedance to detect a pulse current signal to obtain information about partial discharge, has high sensitivity and is susceptible to electromagnetic interference.
2) And (3) ultrahigh frequency detection. The related information is obtained by detecting the ultrahigh frequency electromagnetic wave signal of the partial discharge, and the method has the advantages of high sensitivity, strong anti-electromagnetic interference capability and the like.
The non-electrical methods include photometric methods, ultrasonic detection methods, infrared detection methods, gas chromatography, and the like.
1) And (4) performing a photometric method. Generally, an acoustic-optical combination method is adopted, mechanical waves generated by partial discharge squeeze optical fibers to change characteristics such as refractive indexes of the optical fibers, and therefore the optical waves are modulated to obtain related information.
2) And (4) ultrasonic detection. The piezoelectric sensor is used for detecting ultrasonic signals generated by partial discharge to obtain related information, the ultrasonic signals are not easily subjected to electromagnetic interference, online or offline detection can be easily realized, and the size of parameters such as discharge amount cannot be determined.
3) Gas chromatography. The method has the advantages that the information such as the discharge energy, the type and the like of the gas can be known by detecting the components, the content and the like of the gas generated by partial discharge, the development is mature, a plurality of fault diagnosis experiences are accumulated, and the defect is that the real-time performance is poor.
At present, high-voltage power supplies are mostly needed to be used for detecting partial discharge, detection equipment is heavy, the requirements on test conditions are strict, and partial discharge detection equipment which is simple in operation, light in structure and convenient to use needs to be developed.
[ summary of the invention ]
The invention aims to overcome the defects of the prior art and provides a portable partial discharge detection system of a 10kV transformer based on oscillation waves, which has the advantages of light and handy structure, simple loop and convenient drive control and can be used for rapidly testing the insulation state of a transformer winding on site.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a portable partial discharge detection system of a 10kV transformer based on oscillation waves comprises:
the positive electrode of the direct current power supply DC is connected with two bidirectional power electronic switches IGBT which are connected in series in a reverse direction through a rheostat RW;
one end of a primary winding of the transformer T is connected with the two-way power electronic switch IGBT, and the other end of the primary winding of the transformer T is connected with the negative electrode of the direct-current power supply DC;
and the detection impedance is connected in parallel to the secondary winding of the transformer T and is used for detecting a partial discharge signal of the secondary winding.
The invention further improves the following steps:
and a capacitor C is also connected in parallel on the primary winding of the transformer T to form a resonant circuit.
The power supply further comprises a driving module, and the driving module is used for controlling the on-off of the bidirectional power electronic switch IGBT.
Compared with the prior art, the invention has the following beneficial effects:
in order to overcome the defect that a high-voltage power supply is needed in the prior art, the invention utilizes the characteristics of a resonant circuit, charges a primary winding of a transformer through a direct-current low voltage and a current-limiting resistor to form a stable current, then switches off a switch to enable the switch to generate resonance with a capacitor connected in parallel with the two ends of the switch and form an attenuated oscillating wave, generates an oscillating wave voltage with a higher amplitude on a secondary side of the transformer due to electromagnetic coupling, and realizes the field application of detecting the partial discharge of the transformer by the direct-current oscillating wave by measuring the amplitude of the output voltage of the secondary side and the partial discharge waveform.
Because the IGBT module is provided with the parasitic anti-parallel diode, in order to prevent the high voltage of the resonant circuit from being transmitted to the direct current power supply through the parasitic diode to cause damage to the direct current power supply, the switch of the circuit adopts two IGBT modules which are connected in series in a reverse direction, and the state of the switch is controlled through the driving module. After a button of the driving module is pressed, the switch is closed for 1 second, the direct-current power supply charges the capacitor until the capacitor is saturated, then the switch is automatically switched off, and the primary side forms an LC resonance circuit so as to generate oscillation waves.
[ description of the drawings ]
FIG. 1 is a wiring diagram of a partial discharge detection device
FIG. 2 is a typical waveform diagram of the circuit in an underdamped state
FIG. 3 shows the voltage waveform of the secondary winding and the partial discharge signal measured at a time
[ detailed description ] embodiments
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. 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.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present. In addition, if a layer/element is "on" another layer/element in one orientation, then that layer/element may be "under" the other layer/element when the orientation is reversed.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the positive electrode of the DC power supply DC of the present invention is connected to two IGBTs connected in series in reverse direction through a varistor RW, and returns to the negative electrode of the DC power supply DC through the primary winding of a transformer T, and a capacitor C is connected in parallel with the primary winding of the transformer T to form a resonant tank. The detection impedance is connected with the transformation secondary winding in parallel and is used for detecting a partial discharge signal of the secondary winding. The bidirectional power electronic switch IGBT is connected with a driving module, and the driving module is used for controlling the on-off of the bidirectional power electronic switch IGBT.
The working principle of the invention is as follows:
at the beginning stage of testing, the bidirectional power electronic switch is controlled to be conducted through the driving module, and then the direct current power supply generates current on the primary winding of the transformer through the current-limiting resistor. After the circuit is stabilized, the current flowing through the inductor gradually stabilizes to a constant value, which is determined by the current-limiting resistor and the resistance of the primary winding, and the capacitor also has a corresponding voltage (smaller). At the moment, the switch is turned off through the driving module, the direct-current power supply is cut off, the capacitor and the primary winding of the transformer form a series loop, the primary winding is continuously charged by the capacitor because the current on the winding inductor and the voltage on the capacitor cannot change suddenly, when the current of the inductor is 0, the voltage of the capacitor reaches the negative maximum value, then the capacitor starts to reversely charge the inductor, and thus resonance is formed. Due to the winding resistance in the circuit, the resonance is an amplitude-damped oscillatory wave. Fig. 2 is a typical waveform diagram of the circuit in an underdamped state. With the increase of the time t, the amplitude x of the voltage is oscillated and attenuated under the damping effect, the primary side oscillation wave is electromagnetically coupled through the transformer, and the secondary side oscillation wave with larger amplitude is generated, so that the partial discharge is detected.
Fig. 3 shows that the voltage waveform of the secondary winding and the partial discharge signal are measured at a certain time, the amplitude of the oscillation wave can be controlled by adjusting the resistance value of the rheostat, and when the amplitude of the oscillation wave reaches the maximum value, the obvious partial discharge signal can be seen.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (1)
1. A portable partial discharge detecting system of 10kV transformer based on oscillatory wave, characterized by comprising:
the positive electrode of the direct current power supply DC is connected with two bidirectional power electronic switches IGBT which are connected in series in a reverse direction through a rheostat RW;
one end of a primary winding of the transformer T is connected with the two-way power electronic switch IGBT, and the other end of the primary winding of the transformer T is connected with the negative electrode of the direct-current power supply DC; a primary winding of the transformer T is connected with a capacitor C in parallel to form a resonant circuit;
the detection impedance is connected in parallel to a secondary winding of the transformer T and is used for detecting a partial discharge signal of the secondary winding;
the driving module is used for controlling the on-off of the bidirectional power electronic switch IGBT;
the drive module controls the conduction of the two-way power electronic switch IGBT, and the direct-current power supply generates current on the primary winding of the transformer through the current-limiting resistor; the current value flowing through the inductor is determined by the current-limiting resistor and the resistance of the primary winding; at the moment, the bidirectional power electronic switch IGBT is turned off through the driving module, the direct-current power supply is cut off, the capacitor and the primary winding of the transformer form a series loop, the primary winding is continuously charged through the capacitor, when the inductive current is 0, the voltage of the capacitor reaches the negative maximum value, and then the capacitor starts to reversely charge the inductor to form resonance; the resonance is a damped oscillation wave with attenuated amplitude.
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| CN201811555057.2A CN109581161B (en) | 2018-12-18 | 2018-12-18 | Portable partial discharge detection system of 10kV transformer based on oscillatory wave |
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| CN109581161B true CN109581161B (en) | 2021-01-19 |
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| EP2402775A1 (en) * | 2009-02-26 | 2012-01-04 | Hitachi, Ltd. | Insulation inspection/diagnosis device and method of dynamo-electric machine |
| JP2013142673A (en) * | 2012-01-12 | 2013-07-22 | Mitsubishi Cable Ind Ltd | Partial discharge measuring device, partial discharge measuring method, and partial discharge measurement program |
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| CN201518472U (en) * | 2009-07-24 | 2010-06-30 | 薛建仁 | Parallel resonance oscillating wave generating device |
| CN102346203A (en) * | 2010-07-30 | 2012-02-08 | 丁晓东 | FM (frequency modulation) series resonance and oscillating wave high-voltage generator |
| CN103439637B (en) * | 2013-08-14 | 2016-03-02 | 西安建筑科技大学 | A kind of wave of oscillation production method for local discharge of electrical equipment test |
| CN103543305B (en) * | 2013-10-12 | 2015-11-11 | 西安交通大学 | A kind of power equipment Partial Discharge Detection underdamping ac high voltage generator |
| CN104167927A (en) * | 2014-08-06 | 2014-11-26 | 贵州电力试验研究院 | Transformer induced switching impulse voltage generation device triggered by IGBTs |
| CN104345255A (en) * | 2014-11-07 | 2015-02-11 | 苏州科技学院 | Non-partial discharge damped oscillatory wave high voltage power supply based on low voltage phase-controlled switch |
| CN204595154U (en) * | 2015-05-20 | 2015-08-26 | 哈尔滨理工大学 | For the IGBT high-voltage switch gear that cable local discharge detects |
| CN108427062B (en) * | 2017-02-14 | 2021-04-20 | 丁晓东 | Frequency conversion resonance voltage-withstanding partial discharge test method adopting intermittent excitation |
| CN206602468U (en) * | 2017-03-29 | 2017-10-31 | 哈尔滨理工大学 | A kind of Bipolar pulse power for Insulation monitoring |
| CN206725710U (en) * | 2017-05-05 | 2017-12-08 | 上海格鲁布科技有限公司 | A kind of cable ac voltage withstanding and oscillation wave partial discharge test equipment |
| CN108037418A (en) * | 2017-12-29 | 2018-05-15 | 国网北京市电力公司 | FLU Fault Location Unit, method and device |
| CN207908624U (en) * | 2018-03-22 | 2018-09-25 | 南京普源电气有限公司 | A kind of cable exchange oscillation wave partial discharge detection equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11237430A (en) * | 1998-02-23 | 1999-08-31 | Kikusui Electron Corp | Partial discharge measurement apparatus |
| EP2402775A1 (en) * | 2009-02-26 | 2012-01-04 | Hitachi, Ltd. | Insulation inspection/diagnosis device and method of dynamo-electric machine |
| JP2013142673A (en) * | 2012-01-12 | 2013-07-22 | Mitsubishi Cable Ind Ltd | Partial discharge measuring device, partial discharge measuring method, and partial discharge measurement program |
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Effective date of registration: 20210826 Address after: 710049 No. 28 West Xianning Road, Shaanxi, Xi'an Patentee after: XI'AN JIAOTONG University Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER |