CN117250578A - Abnormality detection system and method for transformer - Google Patents

Abnormality detection system and method for transformer Download PDF

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Publication number
CN117250578A
CN117250578A CN202311389426.6A CN202311389426A CN117250578A CN 117250578 A CN117250578 A CN 117250578A CN 202311389426 A CN202311389426 A CN 202311389426A CN 117250578 A CN117250578 A CN 117250578A
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China
Prior art keywords
transformer
output signal
signal
power output
tested
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CN202311389426.6A
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Inventor
罗振华
成佳富
廖惠琴
汤野
孙迪飞
郭琳
陈成
陈晓鑫
黄凯龙
孙奇
黄晨
许惠强
朱健明
蔡松昆
杨文芳
温振兴
邓月辉
林夙姗
陈坚
胡伟伟
张勇贤
石珂凡
蔡冰子
叶秋晓
旋宇政
张一驰
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Guangdong Power Grid Co Ltd
Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Application filed by Guangdong Power Grid Co Ltd, Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Guangdong Power Grid Co Ltd
Priority to CN202311389426.6A priority Critical patent/CN117250578A/en
Publication of CN117250578A publication Critical patent/CN117250578A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Electric Properties And Detecting Electric Faults (AREA)

Abstract

The invention discloses an anomaly detection system and method of a transformer, wherein the system comprises the following steps: a signal generator and an oscilloscope; the output end of the signal generator is used as a simulation signal output end of the abnormality detection system and is used for outputting an electric power output signal to the transformer to be detected; the input end of the oscilloscope is used as a detection signal input end of the anomaly detection system and is used for receiving an electric power change signal input by the transformer to be detected; the signal generator is used for: generating a first power output signal; starting to continuously send a first power output signal to the transformer to be tested at a first time point; generating a second power output signal; stopping sending the first power output signal at a second time point, and sending a second power output signal to the transformer to be tested; the oscilloscope is used for: acquiring an electric power change signal of the transformer to be tested within a preset time period; according to the power change signal of the transformer to be detected in the preset time period, the abnormal detection result of the transformer to be detected is determined, and the abnormal detection accuracy of the transformer is improved.

Description

Abnormality detection system and method for transformer
Technical Field
The invention relates to the technical field of transformer detection, in particular to an anomaly detection system and method of a transformer.
Background
Compared with the traditional electromagnetic transformer, the electronic transformer has the advantages of high precision, high reliability, wide response band and the like, and is a key element of an intelligent substation, so that the electronic transformer is subjected to anomaly detection to ensure the stability of the electronic transformer.
In the prior art, the electronic transformer is subjected to abnormal detection mainly according to the running state of the electronic transformer under the steady-state working condition, the working condition of the abnormal detection is fixed, and the defect of low abnormal detection accuracy of the electronic transformer exists.
Disclosure of Invention
The invention provides an anomaly detection system and method for a transformer, which are used for enriching the diversity of detection working conditions and improving the anomaly detection accuracy of the transformer.
According to an aspect of an embodiment of the present invention, there is provided an anomaly detection system of a transformer, the system including a signal generator and an oscilloscope; the output end of the signal generator is used as a simulation signal output end of an abnormality detection system of the transformer and is used for outputting an electric power output signal to the transformer to be detected; the input end of the oscilloscope is used as a detection signal input end of an anomaly detection system of the transformer and is used for receiving an electric power change signal input by the transformer to be detected;
the signal generator is used for:
generating a first power output signal;
starting to continuously send a first power output signal to the transformer to be tested at a first time point;
generating a second power output signal; the amplitude of the first power output signal is greater than the amplitude of the second power output signal;
stopping sending the first power output signal at a second time point, and sending a second power output signal to the transformer to be tested; the duration between the first time point and the second time point is a preset duration;
the oscilloscope is used for:
acquiring an electric power change signal of the transformer to be tested within a preset time period; the second time point is located in a preset time period;
and determining an abnormal detection result of the transformer to be detected according to the power change signal of the transformer to be detected in the preset time period.
According to another aspect of the embodiment of the present invention, there is provided an anomaly detection method for a transformer, including:
generating, by a signal generator, a first power output signal;
starting to continuously send a first power output signal to the transformer to be tested at a first time point through a signal generator;
generating, by a signal generator, a second power output signal; the amplitude of the first power output signal is greater than the amplitude of the second power output signal;
stopping sending the first power output signal at a second time point through the signal generator, and sending a second power output signal to the transformer to be tested; the duration between the first time point and the second time point is a preset duration;
acquiring an electric power change signal of the transformer to be tested in a preset time period through an oscilloscope; the second time point is located in a preset time period;
and determining an abnormal detection result of the transformer to be detected according to the power change signal of the transformer to be detected in a preset time period through the oscilloscope.
According to the anomaly detection system of the transformer, provided by the embodiment of the invention, the signal generator starts to continuously send the first power output signal to the transformer to be detected at the first time point; stopping sending the first power output signal at a second time point, and sending a second power output signal to the transformer to be tested; the method and the device for detecting the abnormal state of the transformer to be detected acquire the power change signal of the transformer to be detected in a preset time period through the oscilloscope, so that the abnormal state detection result of the transformer to be detected is determined.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an anomaly detection system of a transformer according to an embodiment of the present invention;
fig. 2A is a schematic structural diagram of a transformer detection system according to a second embodiment of the present invention;
fig. 2B is a schematic structural diagram of another transformer detection system according to the second embodiment of the present invention;
fig. 3 is a flowchart of a method for detecting an abnormality of a transformer according to a third embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first" and "second" and the like in the description and the claims of the present invention and the above drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise 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.
In the technical scheme of the embodiment of the invention, the acquisition, storage, application and the like of the first power output signal and the like meet the requirements of related laws and regulations, and the public sequence is not violated.
Example 1
Fig. 1 is a schematic structural diagram of an anomaly detection system of a transformer according to a first embodiment of the present invention; the embodiment of the invention can be applied to the condition of abnormality detection of the transformer. As shown in fig. 1, the abnormality detection system of the transformer includes: a signal generator 101 and an oscilloscope 102; the output end of the signal generator 101 is used as a simulation signal output end of an anomaly detection system of the transformer and is used for outputting an electric power output signal to the transformer to be detected; the input end of the oscilloscope 102 is used as a detection signal input end of the anomaly detection system 100 of the transformer and is used for receiving a power change signal input by the transformer to be detected; the signal generator 101 is configured to: generating a first power output signal; starting to continuously send a first power output signal to the transformer to be tested at a first time point; generating a second power output signal; the amplitude of the first power output signal is greater than the amplitude of the second power output signal; stopping sending the first power output signal at a second time point, and sending a second power output signal to the transformer to be tested; the duration between the first time point and the second time point is a preset duration; oscilloscope 102 is used to: acquiring an electric power change signal of the transformer to be tested within a preset time period; the second time point is located in a preset time period; and determining an abnormal detection result of the transformer to be detected according to the power change signal of the transformer to be detected in the preset time period.
In this embodiment, the transformer to be measured may be an electronic transformer to be subjected to anomaly detection. The power output signal is the power signal output by the signal generator 101 to the transformer to be tested; the power change signal may be a power signal output by the transformer under test to oscilloscope 102. The generation time of the first power output signal is before the generation time of the second power output signal, and the amplitude of the first power output signal is larger than the amplitude of the second power output signal. It should be noted that, the first time point and the preset time period may be set independently by a technician according to actual requirements or practical experience; the starting time and the ending time of the preset time period can be set independently by a technician according to actual requirements or practical experience, and the second time point is only required to be ensured to be positioned in the preset time period.
In one embodiment, oscilloscope 102 may be used to determine the dc component of the power variation signal during a preset time period according to the power variation signal of the transformer to be tested during the preset time period; and checking whether the direct current component is in the standard range, and if the direct current component is in the standard range, determining that the abnormal detection result of the transformer to be detected is normal.
In this embodiment, the transformer to be measured may be an electronic current transformer or an electronic voltage transformer. If the transformer to be tested is an electronic current transformer, the first power output signal, the second power output signal and the power change signal are all current signals; if the transformer to be tested is an electronic voltage transformer, the first power output signal, the second power output signal and the power change signal are all voltage signals.
In an alternative embodiment, the number of transformers to be tested may be at least one. If the transformer to be tested comprises an electronic current transformer and an electronic voltage transformer, the signal generator 101 is configured to generate a first voltage output signal and a first current output signal; starting to continuously send a first voltage output signal to the electronic voltage transformer and starting to continuously send a first current output signal to the electronic current transformer at a first time point; generating a second voltage output signal and a second current output signal; the amplitude of the first current output signal is larger than that of the second current output signal, and the amplitude of the first voltage output signal is larger than that of the second voltage output signal; stopping sending the first voltage output signal and the first current output signal at a second time point, sending a second voltage output signal to the electronic voltage transformer, and sending a second current output signal to the electronic current transformer; the duration between the first time point and the second time point is a preset duration; oscilloscope 102 is used to: acquiring a voltage change signal of an electronic voltage transformer and a current change signal of an electronic current transformer within a preset time period; the second time point is located in a preset time period; determining an abnormal detection result of the electronic voltage transformer according to a voltage change signal of the electronic voltage transformer in a preset time period, and determining an abnormal detection result of the electronic current transformer according to a current change signal of the electronic current transformer in the preset time period.
In an alternative embodiment, the signal generator 101 may also be configured to: generating a first power output signal; starting to continuously send a first power output signal to the transformer to be tested; oscilloscope 102 is used to: acquiring an electric power output signal of a transformer to be tested; and determining an abnormal detection result of the to-be-detected transformer according to the electric power output signal of the to-be-detected transformer so as to perform abnormal detection on the to-be-detected transformer under a steady-state working condition.
According to the anomaly detection system of the transformer, provided by the embodiment of the invention, the signal generator starts to continuously send the first power output signal to the transformer to be detected at the first time point; stopping sending the first power output signal at a second time point, and sending a second power output signal to the transformer to be tested; the method and the device for detecting the abnormity of the transformer to be detected acquire the power change signal of the transformer to be detected in a preset time period through the oscilloscope, so that the abnormity detection result of the transformer to be detected is determined.
In an alternative embodiment, signal generator 101 includes a real-time simulation module; the output end of the real-time simulation module is the output end of the signal generator 101.
In this embodiment, the real-time simulation module is configured with a transformer simulation model, which can be used to simulate a real transformer.
The real-time simulation module can be used for determining the product between the primary side power rated value and the primary side power tolerance coefficient of the transformer simulation model as a primary side power peak value of the transformer simulation model; determining the ratio between the maximum value of the secondary side power of the transformer simulation model and the peak value of the primary side power of the transformer simulation model as the power transformation ratio of the transformer simulation model; taking the amplitude of the power input signal input to the real-time simulation module as a primary side power input value of the transformer simulation model; and determining a secondary side power output value of the transformer simulation model by multiplying a primary side power output value of the transformer simulation model and a power transformation ratio of the transformer simulation model, and outputting a first power output signal with the amplitude being the secondary side power output value to the transformer to be tested. The primary side power rated value, the primary side power tolerance coefficient and the secondary side power maximum value can be the primary side power rated value, the primary side power tolerance coefficient and the secondary side power maximum value of a real transformer corresponding to the transformer simulation model; the primary-side power tolerance coefficient may be a ratio between a maximum power input value that the primary side of the transformer simulation model can withstand and a primary-side power rated value; the secondary side power maximum may be the maximum power signal amplitude that the real-time simulation module is capable of outputting. By way of example, the secondary side power output value of the transformer simulation model may be determined by the following formula:
wherein U is 2 Representing a secondary-side power output value; u (U) m Representing a secondary side power maximum; u (U) 1 Representing a primary-side power input value; k represents a primary-side power tolerance coefficient; u (U) n Representing the primary side power rating.
In an alternative embodiment, the real-time simulation module further comprises a resistance simulation model, and the resistance value of the resistance simulation model can be adjusted in real time; the resistance simulation model is connected with the transformer simulation model so as to be capable of adjusting the amplitude of the first power output signal generated by the real-time simulation module by adjusting the resistance value of the resistance simulation model. If the transformer to be tested is an electronic voltage transformer, the electric power output signal is a voltage output signal, after the simulation module is implemented to generate a first voltage output signal, the resistance value of the resistance simulation model can be changed, the transformer simulation model is simulated to generate a three-phase symmetrical voltage drop fault, and the amplitude of the first voltage output signal is used as the amplitude of a second voltage output signal after the resistance value of the resistance simulation model is changed, so that a second voltage output signal is generated; if the transformer to be tested is an electronic current transformer, the electric power output signal is a current output signal, after the first current output signal is generated, the real-time simulation module can simulate the fault of single-phase asymmetric voltage drop of the transformer simulation model by changing the resistance value of the resistance simulation model, and the amplitude of the first current output signal is used as the amplitude of the second current output signal after the resistance value of the resistance simulation model is changed, so that the second current output signal is generated. It should be noted that the drop ratio between the voltage after dropping and the voltage before dropping may be set by the technician autonomously, for example, the voltage drop ratio may be 0 or 0.5.
It can be appreciated that in the anomaly detection system for the transformer provided in this embodiment, the real-time simulation module determines the secondary side power output value of the transformer simulation model according to the primary side power rated value, the primary side power tolerance coefficient, the secondary side power maximum value and the primary side power peak value of the transformer simulation model and the amplitude of the power input signal input to the real-time simulation module, and outputs the first power output signal with the amplitude being the secondary side power output value to the transformer to be detected, thereby improving the accuracy of the first power output signal output to the transformer to be detected, and further improving the accuracy of anomaly detection for the transformer to be detected.
In an alternative embodiment, signal generator 101 includes a real-time emulation module and an amplifier; the real-time simulation module is connected with an amplifier, and the output end of the amplifier is the output end of the signal generator 101.
In this embodiment, the output end of the real-time simulation module is used as the input end of the amplifier. An amplifier may be used to amplify the first power output signal and the second power output signal. In a preferred embodiment, the amplifier may be a power amplifier to be able to amplify the current signal and the voltage signal; the voltage output end of the real-time simulation module is connected with the voltage input end of the power amplifier; the current output end of the real-time simulation module is connected with the current input end of the power amplifier.
Specifically, the real-time simulation module is used for: generating a first power output signal; starting to continuously send a first power output signal to the amplifier at a first time point so that the amplifier amplifies the first power output signal and continuously sending the amplified first power output signal to the transformer to be tested; generating a second power output signal; stopping sending the first power output signal at a second time point, and sending a second power output signal to the amplifier so that the amplifier amplifies the second power output signal and continuously sending the amplified second power output signal to the transformer to be tested; the amplifier is used for: amplifying the first power output signal after receiving the first power output signal, and continuously sending the amplified first power output signal to the transformer to be tested; and amplifying the second power output signal after receiving the second power output signal, and continuously transmitting the amplified second power output signal to the transformer to be tested.
It can be understood that in the anomaly detection system of the transformer provided by the embodiment of the invention, the amplifier amplifies the power output signal and sends the amplified power output signal to the transformer to be detected, so that the power output signal with smaller amplitude output by the real-time simulation module is amplified to the standard input range of the transformer to be detected, the condition that the power output signal output by the real-time simulation module is excessively small in amplitude, which causes the power change signal output by the transformer to be detected to be abnormal, is avoided, and the anomaly detection accuracy of the transformer to be detected is improved.
Optionally, oscilloscope 102 includes a wave recording module; the input of the wave recording module is the input of oscilloscope 102.
In this embodiment, the wave recording module may be configured to obtain a power change signal of the transformer to be tested in a preset time period; the second time point is located in a preset time period; and determining an abnormal detection result of the transformer to be detected according to the power change signal of the transformer to be detected in the preset time period. The wave recording module can be used for displaying the power change signal of the transformer to be tested in the preset time period in a waveform mode after the power change signal of the transformer to be tested in the preset time period is obtained, so that a technician can conveniently determine the transient performance of the transformer to be tested according to the waveform.
Optionally, oscilloscope 102 includes a combining module, a message analysis module, and a wave recording module; the combining module is connected with the message analysis module, the message analysis module is connected with the wave recording module, and the input end of the combining module is used as the input end of the oscilloscope 102; the merging module is used for being connected with at least one transformer to be tested.
In this embodiment, the combining module may have at least one input end, where each input end may be connected to an output end of one to-be-tested transformer through an optical fiber, so as to implement connection between the combining module and at least one to-be-tested transformer; the input end of the message analysis module can be connected with the output end of the merging module through an optical fiber, and the optical fiber communication protocol can be IEC61850 protocol. The output end of the message analysis module is connected with the input end of the wave recording module through a network cable.
In one embodiment, the first power output signal generated by the signal generator 101 includes a three-phase power output signal, i.e., a three-phase current output signal or a three-phase voltage output signal; the signal generator 101 includes three output terminals, which are output terminals for each phase of power output signal. The number of the input ends of the transformer to be tested is 3, and the input ends are respectively the input ends of each phase of power output signals; the number of the output ends of the transformer to be tested is 3, and the output ends are respectively the output ends of each phase of power change signals; correspondingly, the output end of the merging module comprises an input end of each phase of power change signal.
In this embodiment, the merging module may be configured to encode, into a message, a power change signal of at least one transformer to be tested in a preset time period, and send the message to the message analysis module. The message analysis module can be used for analyzing the received message to obtain the power change signal of each transformer to be tested in a preset time period, and sending the power change signal of each transformer to be tested in the preset time period to the wave recording module. The wave recording module can be used for acquiring the power change signal of the transformer to be tested in a preset time period; the second time point is located in a preset time period. And determining an abnormal detection result of the transformer to be detected according to the power change signal of the transformer to be detected in the preset time period.
The anomaly detection system of the mutual inductor provided by the embodiment of the invention can simultaneously acquire the power change signals of a plurality of mutual inductors to be detected, encode the power change signals of the mutual inductors to be detected into messages, and uniformly send the messages to the message analysis module for analysis; the message analysis module sends the analyzed power change signals of the transformers to be tested to the wave recording module, so that the wave recording module can simultaneously perform abnormal detection on the transformers to be tested, and the efficiency of performing abnormal detection on the transformers to be tested is improved.
Example two
Fig. 2A is a schematic structural diagram of a transformer detection system according to a second embodiment of the present invention, where the present embodiment is applicable to a case of anomaly detection of a transformer. As shown in fig. 2A, an embodiment of the present invention includes an anomaly detection system 201 of a transformer and at least one transformer 202 to be tested as described in the above embodiments; the anomaly detection system 201 of the transformer is connected with the transformer 202 to be tested. The output end of the transformer detection system 201 is connected with the input end of the transformer 202 to be detected; the input 201 of the transformer detection system is connected to the output of the transformer 202 to be tested.
In the embodiments of the present invention, the details are not described, and reference may be made to the description of the foregoing embodiments.
Optionally, the transformer 202 to be tested includes an electronic voltage transformer; if the transformer 202 to be measured is an electronic voltage transformer, the output signal of the signal generator is a voltage signal.
Optionally, the transformer 202 to be tested includes an electronic current transformer; if the transformer 202 to be measured is an electronic current transformer, the output signal of the signal generator is a current signal.
Alternatively, fig. 2B is a schematic structural diagram of another transformer detection system. As shown in fig. 2B, the transformer detection system includes a real-time simulation module, an amplifier, an electronic voltage transformer, an electronic current transformer, a merging module, a message analysis module and a wave recording module; the electronic voltage transformer and the electronic current transformer are transformers to be tested. Wherein,
the real-time simulation module is used for generating a first voltage output signal and a first current output signal; starting to continuously send a first voltage output signal to a voltage input end of the amplifier and starting to continuously send a first current output signal to a current input end of the amplifier at a first time point;
the amplifier is used for amplifying the first voltage output signal, continuously sending the amplified first power output signal to the electronic voltage transformer, amplifying the first current output signal and continuously sending the amplified first current output signal to the electronic current transformer;
the real-time simulation module is also used for generating a second voltage output signal and a second current output signal; stopping sending the first voltage output signal and the first current output signal at a second time point, starting to continuously send the second voltage output signal to the voltage input end of the amplifier, and starting to continuously send the second current output signal to the current input end of the amplifier;
the amplifier is also used for stopping sending the first voltage output signal and the first current output signal, amplifying the second voltage output signal, continuously sending the amplified second power output signal to the electronic voltage transformer, amplifying the second current output signal, and continuously sending the amplified second current output signal to the electronic current transformer;
the merging module is used for acquiring the voltage change signal of the electronic voltage transformer and the current change signal of the electronic current transformer in a preset time period and encoding the voltage change signal of the electronic voltage transformer and the current change signal of the electronic current transformer in the same message in the preset time period; the message is sent to a message analysis module;
the message analysis module is used for analyzing the received message and sending a voltage change signal of the electronic voltage transformer in a preset time period and a current change signal of the electronic current transformer in the preset time period which are obtained by analysis to the wave recording module;
the wave recording module is used for determining an abnormal detection result of the electronic voltage transformer according to the voltage change signal of the electronic voltage transformer in a preset time period; and determining an abnormal detection result of the electronic current transformer according to the current change signal of the electronic current transformer in the preset time period.
According to the transformer detection system provided by the embodiment of the invention, the signal generator starts to continuously send the first power output signal to the transformer to be detected at the first time point; stopping sending the first power output signal at a second time point, and sending a second power output signal to the transformer to be tested; the method and the device for detecting the abnormal state of the transformer to be detected acquire the power change signal of the transformer to be detected in a preset time period through the oscilloscope, so that the abnormal state detection result of the transformer to be detected is determined.
Example III
Fig. 3 is a flowchart of a method for detecting an abnormality of a transformer according to a third embodiment of the present invention, where the present embodiment is applicable to a case of detecting an abnormality of a transformer. Specifically, the method for detecting the abnormality of the transformer can be realized in a software and/or hardware mode and is integrated in an abnormality detection system of the transformer.
As shown in fig. 3, the method specifically includes the following steps:
s301, generating a first power output signal through a signal generator.
S302, continuously sending a first power output signal to the transformer to be tested at a first time point through a signal generator.
In an alternative embodiment, the first power output signal is amplified by the signal generator and updated to the amplified first power output signal.
It can be appreciated that by adopting the technical scheme, the power output signal with smaller amplitude output by the signal generator can be amplified to the standard input range of the transformer to be detected, so that the occurrence of abnormal condition of the power change signal output by the transformer to be detected due to the fact that the amplitude of the power output signal output by the real-time simulation module is too small is avoided, and the accuracy rate of abnormality detection of the transformer to be detected is improved.
S303, generating a second power output signal through a signal generator; the amplitude of the first power output signal is greater than the amplitude of the second power output signal.
S304, stopping sending the first power output signal at a second time point through the signal generator, and sending a second power output signal to the transformer to be tested; the duration between the first time point and the second time point is a preset duration.
S305, acquiring an electric power change signal of the transformer to be tested in a preset time period through an oscilloscope; the second time point is located in a preset time period.
S306, determining an abnormal detection result of the to-be-detected transformer according to the power change signal of the to-be-detected transformer in a preset time period through an oscilloscope.
According to the anomaly detection method of the transformer, the signal generator starts to continuously send the first power output signal to the transformer to be detected at the first time point; stopping sending the first power output signal at a second time point, and sending a second power output signal to the transformer to be tested; the oscilloscope 102 is used for acquiring the power change signal of the transformer to be tested in a preset time period, so that the abnormal detection result of the transformer to be tested is determined, and compared with the method for detecting the abnormality of the transformer under the steady-state working condition in the prior art, the embodiment of the invention realizes the simulation of the fault working condition, determines the abnormal detection result of the transformer to be tested according to the power change signal under the fault working condition, and improves the abnormal detection accuracy of the transformer.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. An anomaly detection system of a transformer, which is characterized by comprising a signal generator and an oscilloscope; the output end of the signal generator is used as a simulation signal output end of the abnormality detection system of the transformer and is used for outputting an electric power output signal to the transformer to be detected; the input end of the oscilloscope is used as a detection signal input end of the abnormality detection system of the transformer and is used for receiving the electric power change signal input by the transformer to be detected;
the signal generator is used for:
generating a first power output signal;
starting to continuously send the first power output signal to the transformer to be tested at a first time point;
generating a second power output signal; the amplitude of the first power output signal is greater than the amplitude of the second power output signal;
stopping sending the first power output signal at a second time point, and sending the second power output signal to the transformer to be tested; the duration between the first time point and the second time point is a preset duration;
the oscilloscope is used for:
acquiring an electric power change signal of the transformer to be tested within a preset time period; the second time point is located in the preset time period;
and determining an abnormal detection result of the transformer to be detected according to the power change signal of the transformer to be detected in the preset time period.
2. The system of claim 1, wherein the signal generator comprises a real-time simulation module;
the output end of the real-time simulation module is the output end of the signal generator.
3. The system of claim 1, wherein the signal generator comprises a real-time emulation module and an amplifier;
the real-time simulation module is connected with the amplifier, and the output end of the amplifier is the output end of the signal generator.
4. The system of claim 1, wherein the oscilloscope comprises a wave recording module;
the input end of the wave recording module is the input end of the oscilloscope.
5. The system of claim 1, wherein the oscilloscope comprises a merging module, a message analysis module, and a wave recording module;
the message analysis module is connected with the wave recording module, and the input end of the merging module is used as the input end of the oscilloscope; the merging module is used for being connected with at least one transformer to be tested.
6. A transformer detection system comprising the anomaly detection system of the transformer of any one of claims 1-5, and at least one transformer to be tested; the anomaly detection system of the transformer is connected with the transformer to be detected;
the output end of the transformer detection system is connected with the input end of the transformer to be detected;
and the input end of the transformer detection system is connected with the output end of the transformer to be detected.
7. The system of claim 6, the transformer to be tested comprising an electronic voltage transformer;
if the transformer to be tested is an electronic voltage transformer, the output signal of the signal generator is a voltage signal.
8. The system of claim 6, wherein the transformer to be tested comprises an electronic current transformer;
if the transformer to be tested is an electronic current transformer, the output signal of the signal generator is a current signal.
9. An anomaly detection method for a transformer, the method comprising:
generating, by a signal generator, a first power output signal;
starting to continuously send the first power output signal to the transformer to be tested at a first time point through the signal generator;
generating, by the signal generator, a second power output signal; the amplitude of the first power output signal is greater than the amplitude of the second power output signal;
stopping sending the first power output signal at a second time point through the signal generator, and sending the second power output signal to the transformer to be tested; the duration between the first time point and the second time point is a preset duration;
acquiring an electric power change signal of the transformer to be tested in a preset time period through an oscilloscope; the second time point is located in the preset time period;
and determining an abnormal detection result of the to-be-detected transformer according to the power change signal of the to-be-detected transformer in the preset time period through the oscilloscope.
10. The method of claim 9, further comprising, after generating the first power output signal by the signal generator:
and amplifying the first power output signal through the signal generator, and updating the first power output signal into an amplified first power output signal.
CN202311389426.6A 2023-10-25 2023-10-25 Abnormality detection system and method for transformer Pending CN117250578A (en)

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