CN106771910B - Method and device for detecting defects of combined electrical appliance - Google Patents
Method and device for detecting defects of combined electrical appliance Download PDFInfo
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- CN106771910B CN106771910B CN201611131875.0A CN201611131875A CN106771910B CN 106771910 B CN106771910 B CN 106771910B CN 201611131875 A CN201611131875 A CN 201611131875A CN 106771910 B CN106771910 B CN 106771910B
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Abstract
The invention discloses a method and a device for detecting defects of a combined electrical appliance. Wherein, the method comprises the following steps: acquiring a detection position of partial discharge of a combined electrical appliance to be detected; detecting partial discharge of the detection position to obtain an abnormal signal; determining the position of the abnormity in the combined electrical apparatus according to the detected abnormity signal; and determining the defect phase of the combined electrical appliance according to the position of the abnormity in the combined electrical appliance. The invention solves the technical problem that the existing ultrahigh frequency partial discharge detection method cannot effectively carry out partial discharge detection.
Description
Technical Field
The invention relates to the field of partial discharge detection, in particular to a method and a device for detecting defects of a combined electrical appliance.
Background
In recent years, with the rapid development of power technology, gas insulated fully enclosed switchgear (GIS, HGIS) increasingly replaces traditional power transformation equipment, but the safe and stable operation of the switchgear is limited by partial discharge. However, the local discharge detection work requires a high knowledge level and accurate analysis capability of the service tester, but it is difficult for the service tester of a general level to complete the work. Therefore, when there are few professional detection personnel and many combined electrical equipment that need to be maintained, the workload of partial discharge detection of the combined electrical equipment is relatively large.
The ultrahigh frequency partial discharge detection is an important method for detecting the partial discharge of the combined electrical appliance. At present, the ultrahigh frequency partial discharge detection has no uniform process standard and clear defect judgment standard. In a working site, the partial discharge detection work of the combined electrical appliance adopts an ultrahigh frequency partial discharge detector for detection. Because the detection position of the ultrahigh frequency partial discharge can not be fixed, the detection position can be determined only after being searched by a detection person and is generally positioned at a nonmetal totally-enclosed insulation basin, a cable terminal, an earthing knife switch insulation piece, an observation window and the like. The duration detection time of the ultrahigh frequency partial discharge detection is not fixed, and the detection personnel can master the detection time by themselves. Under the condition of huge field workload, the detection personnel can shorten the working time at will, so that the judgment result is deviated from the actual condition. Therefore, when the work is carried out on site, each professional detection team needs to make an independent work flow, and human factors have great influence on the determination of the partial discharge defect.
Aiming at the problem that the existing ultrahigh frequency partial discharge detection method cannot effectively perform partial discharge detection, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a method and a device for detecting defects of a combined electrical appliance, which at least solve the technical problem that the existing ultrahigh frequency partial discharge detection method cannot effectively perform partial discharge detection.
According to an aspect of an embodiment of the present invention, there is provided a method of detecting a defect of a composite apparatus, including: acquiring a detection position of partial discharge of a combined electrical appliance to be detected; detecting partial discharge of the detection position to obtain an abnormal signal; determining the position of the abnormity in the combined electrical apparatus according to the detected abnormity signal; and determining the defect phase of the combined electrical appliance according to the position of the abnormity in the combined electrical appliance.
Further, the method for detecting the partial discharge of the detection position and obtaining the abnormal signal comprises the following steps: detecting an environmental signal at a detection position by using an ultrahigh frequency partial discharge detector, and positioning to obtain an abnormal signal by comparing a variation value of the amplitude of the ultrahigh frequency signal; or, under the condition that the combined electrical apparatus is in a three-phase split type structure, the abnormal signal is obtained by positioning through a plurality of phases in the three-phase split type structure.
Further, after the abnormal signal is located by a plurality of phases in the three-phase split structure, the method further comprises the following steps: determining the phase with the defect by comparing the abnormal signal amplitudes of the detection positions corresponding to the plurality of phases; alternatively, the phase where the defect exists is determined by comparing the time difference of the abnormal signal detected for each phase.
Further, before obtaining a detection position where partial discharge occurs in the to-be-detected combined electrical apparatus, the method further includes: acquiring a synchronous signal of a to-be-tested combined electrical appliance, wherein the synchronous signal is used for ensuring that the voltage frequency of a power supply is the same as that of the combined electrical appliance, and the step comprises the following steps of: and acquiring a synchronous signal at the running cable or acquiring the synchronous signal at the low-voltage side of the excitation transformer.
Further, the method for determining the position of the abnormality in the combined electrical appliance according to the detected abnormality signal comprises the following steps: collecting an environmental signal; comparing the parameters of the environment signal with the parameters of the internal signal of the combined electrical appliance, wherein the parameters of the environment signal at least comprise one of the following parameters: phase and amplitude, the parameters of the internal signal of the combined electrical appliance comprise at least one of the following: phase and amplitude; and if the phase of the environment signal is the same as that of the internal signal of the combined electrical appliance and the amplitude of the environment signal is greater than that of the internal signal of the combined electrical appliance, determining that the abnormity is positioned outside the combined electrical appliance to be tested, otherwise, determining that the abnormity is positioned inside the combined electrical appliance to be tested.
Further, the method for detecting the defects of the combined electrical appliance further comprises the following steps: comparing the amplitude values of the ultrahigh frequency signals at the detection positions, and determining the positions of the two ultrahigh frequency signals; and determining the position of the defect according to the time difference method and the positions of the two ultrahigh frequency signals.
According to another aspect of the embodiments of the present invention, there is also provided an apparatus for detecting defects of a combined electrical appliance, including: the acquisition module is used for acquiring the detection position of the partial discharge of the combined electrical appliance to be detected; the detection module is used for detecting the partial discharge of the detection position to obtain an abnormal signal; the first execution module is used for determining the position of the abnormity in the combined electrical apparatus according to the detected abnormal signal; and the second execution module is used for determining the defect phase of the combined electrical appliance according to the position of the abnormality in the combined electrical appliance.
Further, the detection module includes: the first positioning module is used for detecting an environmental signal of a detection position by using the ultrahigh frequency partial discharge detector and positioning to obtain an abnormal signal by comparing a change value of the amplitude of the ultrahigh frequency signal; or the second positioning module is used for positioning to obtain the abnormal signal through a plurality of phases in the three-phase split structure under the condition that the combined electrical apparatus is in the three-phase split structure.
Further, the detection module further comprises: the first comparison module is used for determining the phase with the defect by comparing the abnormal signal amplitudes of the detection positions corresponding to the plurality of phases; or the second comparison module is used for determining the phase with the defect by comparing the time difference of the abnormal signals detected by each phase.
Further, the apparatus for detecting defects of a combined electrical appliance further comprises: the signal acquisition module is used for obtaining the synchronizing signal of the combined electrical apparatus to be tested, wherein the synchronizing signal is used for ensuring that the voltage frequency of the power supply and the voltage frequency of the combined electrical apparatus are the same, and the signal acquisition module comprises: and the synchronous signal acquisition module is used for acquiring a synchronous signal at the running cable or acquiring the synchronous signal at the excitation transformer low-voltage side.
Further, the first execution module includes: the acquisition module is used for acquiring environmental signals; the parameter comparison module is used for comparing the parameters of the environment signal with the parameters of the internal signal of the combined electrical appliance, wherein the parameters of the environment signal at least comprise one of the following parameters: phase and amplitude, the parameters of the internal signal of the combined electrical appliance comprise at least one of the following: phase and amplitude; and the third positioning module is used for determining that the abnormity is positioned outside the to-be-detected combined electrical appliance if the phase of the environment signal is the same as the phase of the internal signal of the combined electrical appliance and the amplitude of the environment signal is greater than the amplitude of the internal signal of the combined electrical appliance, otherwise, the abnormity is positioned inside the to-be-detected combined electrical appliance.
Further, the apparatus for detecting defects of a combined electrical appliance further comprises: the amplitude comparison module is used for comparing the amplitudes of the ultrahigh frequency signals at the detection positions and determining the positions of the two ultrahigh frequency signals; and the fourth positioning module is used for determining the position of the defect according to the time difference method and the positions of the two ultrahigh frequency signals.
In the embodiment of the invention, a detection standard is formulated, a detection position of partial discharge of a to-be-detected combined electrical appliance method is obtained, the partial discharge of the detection position is detected to obtain an abnormal signal, the position of the abnormality in the combined electrical appliance is determined according to the detected abnormal signal, and finally the defect phase of the combined electrical appliance is determined according to the position of the abnormality in the combined electrical appliance, so that the purpose of finding the partial discharge defect of the combined electrical appliance by a wire is achieved, the technical effect of improving the working efficiency of detection personnel is realized, and the technical problem that the existing ultrahigh frequency partial discharge detection method cannot effectively perform partial discharge detection is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method of detecting defects in a combined electrical appliance according to an embodiment of the present invention;
FIG. 2 is a flow chart of an alternative method of detecting defects in a combined electrical appliance, according to an embodiment of the present invention;
FIG. 3 is a flow chart of an alternative method of detecting defects in a combined electrical appliance, in accordance with embodiments of the present invention;
FIG. 4 is a flow chart of an alternative method of detecting defects in a combined electrical appliance, in accordance with embodiments of the present invention;
FIG. 5 is a flow chart of an alternative method of detecting defects in a combined electrical appliance, in accordance with embodiments of the present invention;
fig. 6 is a diagram illustrating a manner of labeling a detection position of an uhf partial discharge of an optional combined electrical apparatus according to an embodiment of the present invention; and
fig. 7 is a schematic structural diagram of an apparatus for detecting defects of a combined electrical apparatus according to an embodiment of the present invention.
Detailed Description
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, and not all of the embodiments. 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.
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.
Example 1
According to an embodiment of the present invention, there is provided an embodiment of a method of detecting defects of a combined electrical appliance.
Fig. 1 is a flowchart of a method for detecting defects of a combined electrical appliance according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S102, acquiring a detection position of partial discharge of the to-be-detected combined electrical appliance;
step S104, detecting partial discharge of the detection position to obtain an abnormal signal;
step S106, determining the position of the abnormity in the combined electrical apparatus according to the detected abnormal signal;
and step S108, determining the defect phase of the combined electrical appliance according to the position of the abnormality in the combined electrical appliance.
In the scheme defined in steps S102 to S108, the detection of the partial discharge (i.e., the partial discharge) may be detection of an ultrahigh frequency partial discharge, and a detection position where the partial discharge occurs in the to-be-detected combined electrical apparatus is a detection position of an ultrahigh frequency. In an alternative embodiment, before the uhf partial discharge detection is performed, image retention is required for each interval operation condition of the combiner. When detecting the ultrahigh frequency partial discharge, the detection position of the ultrahigh frequency may be: the non-metallic closure of the basin insulator and the cable termination (if any). If the basin-type insulator is all-metal closed, the sensor is placed at the grounding switch insulator and the observation window, and the ultrahigh frequency sensor is prevented from contacting with the fastening bolt. Fig. 6 shows a diagram of how to label the ultrahigh frequency partial discharge detection position of an optional combined electrical apparatus, where 601, 603, and 605 in fig. 6 are detection positions where partial discharge occurs in the combined electrical apparatus, and represent the 1# basin, the 2# basin, and the 3# basin, respectively.
It should be noted that the storage naming rule of the uhf detection data is as follows: the method comprises the steps of substation name, detection date, scheduling numbers of all combined electrical appliances and phase difference, wherein the detection phase difference can not be recorded by the three-phase common-bin equipment. Further, the ultrahigh frequency detection time is defined as: the effective detection time of each detection position should not be less than 30 seconds, the number of saved maps should not be less than 10, and the time for saving maps should not be less than 20 seconds.
In another optional embodiment, the defect phase of the combined electrical apparatus is determined according to the position of the abnormality in the combined electrical apparatus, the defect position of the combined electrical apparatus can be determined according to the attenuation characteristic of the ultrahigh frequency signal, and after the defect phase and the position are determined, the defect type can be determined according to the discharge characteristic of the ultrahigh frequency signal. According to the defect type and the defect positioning result, the correctness of the detection conclusion can be verified by combining the primary structure of the combined electrical apparatus.
After obtaining the defect phase and defect position of the composite apparatus and determining the defect type, it is necessary to leave the images of the composite apparatus having the discharge defect and to specify the position of each uhf detection point. Wherein, the influence on retention requires that the PRPD and PHD maps are not less than 3, and no known interference signal exists. In the detection process, the surrounding signals need to be kept clean to the maximum extent, the interference of artificial signals is reduced as much as possible, and the detection time can be prolonged if necessary. In the case of a disc insulator to be recorded, the following numbering principles are followed: the line intervals of the combined electrical apparatus are ordered from the line to the bus, the bus-tie (subsection) intervals are ordered from the small bus to the large bus, and the PT intervals are ordered from PT to the bus as 1, 2 and 3 … N, wherein the basin insulator numbers of the three-phase compartment separation equipment are ordered in phase.
In another optional embodiment, after the ultrahigh frequency partial discharge detection of the combined electrical apparatus is finished, field data analysis can be performed according to a detection map. It should be noted that, at this time, the interference signal should be eliminated, and qualitative and quantitative analysis should be performed on the existing partial discharge defect, so as to determine the size and type of discharge, and record the basic situation on site. And after the ultrahigh frequency partial discharge detection work is finished, the power supply of the ultrahigh frequency partial discharge detector is turned off, the test power supply and the grounding wire are removed, the test cable is arranged, the work site is cleared, and the detected combined electrical appliance is checked again to be free of abnormity.
Based on the schemes defined in steps S102 to S106 in the foregoing embodiment, it is possible to obtain a detection position where partial discharge occurs by obtaining a combined electrical apparatus to be detected, detect partial discharge at the detection position to obtain an abnormal signal, determine a position where the abnormality is located in the combined electrical apparatus according to the detected abnormal signal, and finally determine a defect phase of the combined electrical apparatus according to the position where the abnormality is located in the combined electrical apparatus.
Optionally, fig. 2 shows a method for detecting a partial discharge at a detection position to obtain an abnormal signal, as shown in fig. 2, the method includes the following steps:
step S202, detecting an environmental signal at a detection position by using an ultrahigh frequency partial discharge detector, and positioning to obtain an abnormal signal by comparing a variation value of the amplitude of the ultrahigh frequency signal; or,
and S204, under the condition that the combined electrical apparatus is in a three-phase split structure, positioning through a plurality of phases in the three-phase split structure to obtain abnormal signals.
In an alternative embodiment, when the ultrahigh frequency detects a suspected partial discharge defect, the ultrahigh frequency partial discharge detector is used to detect a detection environment, locate an abnormal signal by comparing the amplitude variation of the ultrahigh frequency signal, and eliminate environmental interference, such as interference of a radar. For a three-phase split-type structure combined electrical apparatus, an abnormal signal can be detected only in a phase with a defect generally, when the abnormal signal is large, other phases except the defect phase can also detect the abnormal signal, and at the moment, the defect phase can be determined by comparing the amplitude of the abnormal signal of each corresponding detection position, so that the defect phase can be determined.
Optionally, fig. 3 shows a method after obtaining the abnormal signal by positioning through multiple phases in the three-phase split structure, as shown in fig. 3, the method includes the following steps:
step S302, determining the phase with the defect by comparing the abnormal signal amplitudes of the detection positions corresponding to the plurality of phases; or,
step S304, the phase with the defect is determined by comparing the time difference of the abnormal signals detected by each phase.
In an alternative embodiment, in the case of a three-phase split configuration of the combined electrical apparatus, the anomaly signal is typically detected only for the phase with the defect. When the abnormal signal is large, the abnormal signal can be detected by other phases except the defect phase, at the moment, the defect phase can be basically determined by comparing the amplitude of the abnormal signal of each corresponding detection position, and then the defect phase can be determined by comparing the time difference of the abnormal signal detected by each phase. For the three-phase combined electrical appliance with the common-body structure, the synchronous phase can be determined firstly, then the phase setting of the ultrahigh frequency detection software is changed, and the defect phase is determined by combining the characteristics of the discharge signals in one quadrant and three quadrants.
Optionally, the method before obtaining the detection position where the partial discharge occurs in the to-be-detected combined electrical appliance includes obtaining a synchronization signal of the to-be-detected combined electrical appliance, where the synchronization signal is used to ensure that the voltage frequencies of the power supply and the combined electrical appliance are the same, and the step includes: and acquiring a synchronous signal at the running cable or acquiring the synchronous signal at the low-voltage side of the excitation transformer.
In an alternative embodiment, the in-station power supply or sync coil is used to acquire the sync signal from the B-phase (sync coil arrow down) of the travelling cable and perform image persistence. In the non-power frequency test, the synchronizing signal can be acquired from the excitation low voltage side, and the synchronizing signal can be amplified by using an amplifier. In the process of detection, if the synchronous power supply needs to be replaced, the image is reserved.
It should be noted that, when the synchronization signal is obtained from the running cable, the frequency of the synchronization power supply should be ensured to be the same as the running voltage frequency of the combined electrical apparatus.
Optionally, fig. 4 shows a method for determining a position of an anomaly in a combined electrical appliance according to a detected anomaly signal, the method comprising the following steps:
step S402, collecting an environment signal;
step S404, comparing the parameters of the environment signal with the parameters of the internal signal of the combined electrical apparatus, wherein the parameters of the environment signal at least include one of the following parameters: phase and amplitude, the parameters of the internal signal of the combined electrical appliance comprise at least one of the following: phase and amplitude;
step S406, if the phase of the environment signal is the same as the phase of the internal signal of the combined electrical apparatus, and the amplitude of the environment signal is greater than the amplitude of the internal signal of the combined electrical apparatus, it is determined that the anomaly is located outside the combined electrical apparatus to be detected, otherwise, the anomaly is located inside the combined electrical apparatus to be detected.
In an alternative embodiment, when a suspected partial discharge defect is detected at the ultrahigh frequency, first, the detection environment is detected by using an ultrahigh frequency partial discharge detector, and by comparing the amplitude change of the ultrahigh frequency signal, an abnormal signal is located, and environmental interference, such as radar interference and external discharge, is eliminated. Then, the phase and amplitude of the environment signal and the internal signal of the combined electrical appliance are compared. If the phases of the two are the same and the amplitude inside the combiner is smaller than the replica of the ambient signal, it can be said that the anomaly is located outside the combiner, otherwise, the anomaly may be located inside the combiner (or inside a cable connected to the combiner).
Optionally, fig. 5 shows a method of an optional method for detecting defects of a combined electrical apparatus, as shown in fig. 5, the method includes the following steps:
step S502, comparing the amplitude values of the ultrahigh frequency signals at the detection positions, and determining the positions of the two ultrahigh frequency signals;
step S504, the position of the defect is determined according to the time difference method and the positions of the two ultrahigh frequency signals.
In an alternative embodiment, since the uhf signal has an attenuation characteristic, and the defect of the uhf signal is generally located between two uhf detection points having the largest signal amplitude, the position of the defect is reduced to be located between two uhf detection points, i.e., in a certain air chamber, by comparing the amplitude of the uhf signal at each detection position. And then, the defects can be positioned by a ultrahigh frequency time difference method, and the positions of the defects can be judged by changing the operation mode of the combined electrical appliance under the condition that the defects cannot be positioned by the time difference method.
In the process of locating the defect by using the time difference method, the ultrahigh frequency signal can be amplified and filtered according to actual conditions.
In another optional embodiment, before the detection position of the partial discharge of the to-be-detected combined electrical appliance is obtained, the ultrahigh frequency partial discharge detector needs to be assembled and started, the detection mode is set to be 'no angle compensation', and the connection is completed after the ultrahigh frequency partial discharge detector is verified. Then, the ultrahigh frequency partial discharge detector can normally communicate, and can artificially manufacture an ultrahigh frequency signal for the ultrahigh frequency partial discharge detector and detect the signal on site.
Example 2
According to an embodiment of the present invention, an embodiment of an apparatus for detecting defects of a combined electrical apparatus is provided.
Fig. 7 is a schematic structural diagram of an apparatus for detecting defects of a combined electrical appliance according to an embodiment of the present invention, as shown in fig. 7, the apparatus including: an obtaining module 701, a detecting module 703, a first executing module 705 and a second executing module 707. The acquisition module 701 is used for acquiring a detection position of partial discharge of a to-be-detected combined electrical appliance; a detection module 703, configured to detect a partial discharge at a detection position to obtain an abnormal signal; a first executing module 705, configured to determine, according to the detected abnormal signal, a position where the abnormality is located in the combined electrical appliance; and a second executing module 707, configured to determine a defect phase of the combiner according to a position where the anomaly is located in the combiner.
Specifically, the detection of the partial discharge (i.e., the partial discharge) may be detection of an ultrahigh frequency partial discharge, and a detection position of the partial discharge of the to-be-detected combined electrical appliance is a detection position of an ultrahigh frequency. In an alternative embodiment, before the uhf partial discharge detection is performed, image retention is required for each interval operation condition of the combiner. When detecting the ultrahigh frequency partial discharge, the detection position of the ultrahigh frequency may be: the non-metallic closure of the basin insulator and the cable termination (if any). If the basin-type insulator is all-metal closed, the sensor is placed at the grounding switch insulator and the observation window, and the ultrahigh frequency sensor is prevented from contacting with the fastening bolt. Fig. 6 shows a diagram of a labeling manner of ultrahigh frequency partial discharge detection positions of an optional combined electrical apparatus, wherein the 1# basin, the 2# basin, the 3# basin, the 4# basin, the 5# basin and the 6# basin in fig. 6 are detection positions where partial discharge occurs in the combined electrical apparatus.
It should be noted that the storage naming rule of the uhf detection data is as follows: the method comprises the steps of substation name, detection date, scheduling numbers of all combined electrical appliances and phase difference, wherein the detection phase difference can not be recorded by the three-phase common-bin equipment. Further, the ultrahigh frequency detection time is defined as: the effective detection time of each detection position should not be less than 30 seconds, the number of saved maps should not be less than 10, and the time for saving maps should not be less than 20 seconds.
In another optional embodiment, the defect phase of the combined electrical apparatus is determined according to the position of the abnormality in the combined electrical apparatus, the defect position of the combined electrical apparatus can be determined according to the attenuation characteristic of the ultrahigh frequency signal, and after the defect phase and the position are determined, the defect type can be determined according to the discharge characteristic of the ultrahigh frequency signal. According to the defect type and the defect positioning result, the correctness of the detection conclusion can be verified by combining the primary structure of the combined electrical apparatus.
After obtaining the defect phase and defect position of the composite apparatus and determining the defect type, it is necessary to leave the images of the composite apparatus having the discharge defect and to specify the position of each uhf detection point. Wherein, the influence on retention requires that the PRPD and PHD maps are not less than 3, and no known interference signal exists. In the detection process, the surrounding signals need to be kept clean to the maximum extent, the interference of artificial signals is reduced as much as possible, and the detection time can be prolonged if necessary. In the case of a disc insulator to be recorded, the following numbering principles are followed: the line intervals of the combined electrical apparatus are ordered from the line to the bus, the bus-tie (subsection) intervals are ordered from the small bus to the large bus, and the PT intervals are ordered from PT to the bus as 1, 2 and 3 … N, wherein the basin insulator numbers of the three-phase compartment separation equipment are ordered in phase.
In another optional embodiment, after the ultrahigh frequency partial discharge detection of the combined electrical apparatus is finished, field data analysis can be performed according to a detection map. It should be noted that, at this time, the interference signal should be eliminated, and qualitative and quantitative analysis should be performed on the existing partial discharge defect, so as to determine the size and type of discharge, and record the basic situation on site. And after the ultrahigh frequency partial discharge detection work is finished, the power supply of the ultrahigh frequency partial discharge detector is turned off, the test power supply and the grounding wire are removed, the test cable is arranged, the work site is cleared, and the detected combined electrical appliance is checked again to be free of abnormity.
It can be known from the above that, by obtaining a detection position where partial discharge occurs in a to-be-detected combined electrical appliance method, detecting partial discharge in the detection position to obtain an abnormal signal, then determining a position where the abnormality is located in the combined electrical appliance according to the detected abnormal signal, and finally determining a defect phase of the combined electrical appliance according to the position where the abnormality is located in the combined electrical appliance, it is easy to notice that the above method for detecting defects of the combined electrical appliance prescribes an ultrahigh frequency partial discharge detection process and a partial discharge defect judgment standard for the combined electrical appliance, so that efficiency of finding partial discharge defects of the combined electrical appliance is effectively improved, thereby achieving a technical effect of improving working efficiency of detection personnel, and further solving a technical problem that an existing ultrahigh frequency partial discharge detection method cannot effectively perform partial discharge detection.
Optionally, the detection module includes: the positioning device comprises a first positioning module and a second positioning module. The first positioning module is used for detecting an environmental signal of a detection position by using an ultrahigh frequency partial discharge detector and positioning to obtain an abnormal signal by comparing a change value of the amplitude of the ultrahigh frequency signal; or the second positioning module is used for positioning to obtain the abnormal signal through a plurality of phases in the three-phase split structure under the condition that the combined electrical apparatus is in the three-phase split structure.
Optionally, the detection module further includes: a first comparison module and a second comparison module. The first comparison module is used for determining the phase with the defect by comparing the abnormal signal amplitudes of the detection positions corresponding to the plurality of phases; or the second comparison module is used for determining the phase with the defect by comparing the time difference of the abnormal signals detected by each phase.
Optionally, the apparatus for detecting defects of a combined electrical apparatus further includes: and a signal acquisition module. Wherein, signal acquisition module for acquire the synchronizing signal of the combined electrical apparatus that awaits measuring, wherein, synchronizing signal is used for guaranteeing that the voltage frequency of power and combined electrical apparatus is the same, and signal acquisition module includes: and the synchronous signal acquisition module is used for acquiring a synchronous signal at the running cable or acquiring the synchronous signal at the excitation transformer low-voltage side.
Optionally, the first execution module includes: the device comprises an acquisition module, a parameter comparison module and a third positioning module. The acquisition module is used for acquiring an environmental signal; the parameter comparison module is used for comparing the parameters of the environment signal with the parameters of the internal signal of the combined electrical appliance, wherein the parameters of the environment signal at least comprise one of the following parameters: phase and amplitude, the parameters of the internal signal of the combined electrical appliance comprise at least one of the following: phase and amplitude; the third positioning module is used for determining that the abnormity is positioned outside the to-be-detected combined electrical appliance if the phase of the environment signal is the same as the phase of the internal signal of the combined electrical appliance and the amplitude of the environment signal is greater than the amplitude of the internal signal of the combined electrical appliance, otherwise, the abnormity is positioned inside the to-be-detected combined electrical appliance.
Optionally, the apparatus for detecting defects of a combined electrical apparatus further includes: the amplitude comparison module and the fourth positioning module. The amplitude comparison module is used for comparing the amplitude of the ultrahigh frequency signal at the detection position and determining the positions of the two ultrahigh frequency signals; and the fourth positioning module is used for determining the position of the defect according to the time difference method and the positions of the two ultrahigh frequency signals.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A method of detecting defects in a composite appliance, comprising:
acquiring a detection position of partial discharge of a combined electrical appliance to be detected;
detecting partial discharge of the detection position to obtain an abnormal signal;
determining the position of the abnormality in the combined electrical appliance according to the detected abnormal signal;
determining the defect phase of the combined electrical appliance according to the position of the abnormality in the combined electrical appliance;
the method further comprises the following steps: determining the defect position of the combined electrical apparatus according to the attenuation characteristic of the ultrahigh frequency signal, determining the defect type according to the discharge characteristic of the ultrahigh frequency signal, and verifying the detection conclusion according to the defect type and the defect positioning result and by combining the primary structure of the combined electrical apparatus;
determining the position of an abnormality in the combined electrical appliance according to the detected abnormal signal, wherein the determining comprises the following steps: collecting an environmental signal; comparing the parameters of the environment signal with the parameters of the internal signal of the combined electrical appliance, wherein the parameters of the environment signal at least comprise one of the following parameters: phase and amplitude, and the parameters of the internal signal of the combined electrical appliance at least comprise one of the following: phase and amplitude; if the phase of the environment signal is the same as that of the internal signal of the combined electrical appliance and the amplitude of the environment signal is larger than that of the internal signal of the combined electrical appliance, determining that the abnormity is positioned outside the combined electrical appliance to be tested, otherwise, determining that the abnormity is positioned inside the combined electrical appliance to be tested;
detecting partial discharge at the detection position to obtain an abnormal signal, comprising: and detecting the environmental signal of the detection position by using an ultrahigh frequency partial discharge detector, and positioning to obtain the abnormal signal by comparing the change value of the amplitude of the ultrahigh frequency signal.
2. The method according to claim 1, wherein before acquiring the detection position of partial discharge of the to-be-detected combined electrical apparatus, the method further comprises:
acquiring a synchronous signal of a to-be-tested combined electrical appliance, wherein the synchronous signal is used for ensuring that the voltage frequency of a power supply is the same as that of the combined electrical appliance, and the method comprises the following steps of:
and acquiring the synchronous signal at the running cable or acquiring the synchronous signal at the excitation low-voltage side.
3. An apparatus for detecting defects of a composite appliance, comprising:
the acquisition module is used for acquiring the detection position of the partial discharge of the combined electrical appliance to be detected;
the detection module is used for detecting the partial discharge of the detection position to obtain an abnormal signal;
the first execution module is used for determining the position of an abnormality in the combined electrical appliance according to the detected abnormal signal;
the second execution module is used for determining the defect phase of the combined electrical appliance according to the position of the abnormity in the combined electrical appliance;
the device is also used for determining the defect position of the combined electrical apparatus according to the attenuation characteristic of the ultrahigh frequency signal, determining the defect type according to the discharge characteristic of the ultrahigh frequency signal, and verifying the detection conclusion according to the defect type and the defect positioning result and by combining the primary structure of the combined electrical apparatus;
wherein the first execution module comprises: the acquisition module is used for acquiring environmental signals; a parameter comparison module, configured to compare a parameter of the environment signal with a parameter of the internal signal of the combined electrical apparatus, where the parameter of the environment signal at least includes one of: phase and amplitude, and the parameters of the internal signal of the combined electrical appliance at least comprise one of the following: phase and amplitude; the third positioning module is used for determining that the abnormity is positioned outside the to-be-tested combined electrical appliance if the phase of the environment signal is the same as the phase of the internal signal of the combined electrical appliance and the amplitude of the environment signal is greater than the amplitude of the internal signal of the combined electrical appliance, otherwise, the abnormity is positioned inside the to-be-tested combined electrical appliance;
the detection module comprises: and the first positioning module is used for detecting the environmental signal of the detection position by using an ultrahigh frequency partial discharge detector and positioning to obtain the abnormal signal by comparing the change value of the amplitude of the ultrahigh frequency signal.
4. The apparatus of claim 3, further comprising:
the signal acquisition module is used for acquiring a synchronous signal of the combined electrical appliance to be tested, wherein the synchronous signal is used for ensuring that a power supply is the same as the voltage frequency of the combined electrical appliance, and the signal acquisition module comprises:
and the synchronous signal acquisition module is used for acquiring the synchronous signal at the running cable or acquiring the synchronous signal at the excitation low-voltage side.
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| CN109633395A (en) * | 2019-01-24 | 2019-04-16 | 保定华创电气有限公司 | A kind of measurement of local discharge signal and localization method |
| CN112067955A (en) * | 2020-09-16 | 2020-12-11 | 杭州西湖电子研究所 | Three-phase synchronous partial discharge detection method |
| CN113156279B (en) * | 2021-04-09 | 2023-01-17 | 江苏大学 | Power distribution cabinet partial discharge positioning method based on probability hypothesis density filter |
| CN113884834B (en) * | 2021-10-26 | 2022-10-21 | 四川大学 | Motor stator insulation defect detection device and method and electronic equipment |
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