CN114113862A - Transformer short circuit impact monitoring method and monitoring device - Google Patents
Transformer short circuit impact monitoring method and monitoring device Download PDFInfo
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- CN114113862A CN114113862A CN202111448147.3A CN202111448147A CN114113862A CN 114113862 A CN114113862 A CN 114113862A CN 202111448147 A CN202111448147 A CN 202111448147A CN 114113862 A CN114113862 A CN 114113862A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a monitoring method and a monitoring device for short circuit impact of a transformer, which comprise a signal processing unit, an AD module and a processor; the signal processing unit is used for acquiring a first signal of the transformer, analyzing and processing the first signal and inputting an obtained second signal into the AD module; the AD module is used for converting the second signal into a numerical value signal and transmitting the numerical value signal to the processor; the processor is used for judging the numerical value signal and a preset current value, judging whether the numerical value signal meets a preset condition or not, and triggering an alarm module to give an alarm if the numerical value signal meets the preset condition; the method has the advantages of acquiring the short-circuit impact data of the transformer in real time, automatically recording the amplitude and the frequency of the short-circuit impact voltage and current, automatically giving an alarm when the current exceeds a specified threshold value, and having the advantages of high accuracy, simplicity in operation and high efficiency compared with manual extraction of fault information.
Description
Technical Field
The invention relates to the technical field of short circuit impact detection, in particular to a transformer short circuit impact monitoring method and a monitoring device.
Background
At present, when monitoring transformer trouble, what generally adopted is that short circuit fault takes place the back, and technical staff gets the scene and draws trouble data, and the artificial record strikes peak value and strikes the number of times, if statistics is inaccurate or artificial careless, probably causes the main transformer to suffer the information loss of assaulting, can cause certain influence to equipment, the occurence of failure probably appears when serious.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention aims to solve the technical problem that after a transformer fails, the uncertain performance caused by data information of the failed transformer is artificially counted, and aims to provide a transformer short circuit impact monitoring method and a monitoring device, which can automatically monitor current signals in the transformer and can judge whether the transformer has short circuit failure risks.
The invention is realized by the following technical scheme:
a transformer short circuit impact monitoring device comprises a signal processing unit, an AD module and a processor;
the signal processing unit is used for acquiring a first signal of the transformer, analyzing and processing the first signal and inputting an obtained second signal into the AD module;
the AD module is used for converting the second signal into a numerical value signal and transmitting the numerical value signal to the processor;
the processor is used for judging the numerical value signal and a preset current value, judging whether the numerical value signal meets a preset condition or not, and triggering an alarm module to give an alarm if the numerical value signal meets the preset condition.
In the conventional short-circuit fault of the transformer, a mode that an operator extracts fault data on site and manually records peak values or impact times after the short-circuit fault occurs is generally adopted, but when the state of the transformer is judged by adopting the method, the condition of error statistics or omission statistics of the operator may exist, and the real-time state of the transformer cannot be accurately judged in time, so that the transformer is influenced to a certain extent.
Preferably, the first signal includes a voltage signal, a current signal, and a switch state signal.
Preferably, the signal processing unit includes an analog signal conditioning unit and a switching value isolation acquisition unit, and the analog signal conditioning unit is configured to acquire an analog signal of the transformer, perform normalization processing on the analog signal, and send the processed signal to the AD module;
the switching value isolation acquisition unit is used for acquiring a switching state signal of the transformer, converting the switching state signal into a level signal and inputting the level signal into the AD module.
Preferably, the analog signal conditioning unit includes m transformer boards, each of the transformer boards is provided with n transformers, each of the transformer boards is used for measuring an analog signal of a corresponding winding, and each of the transformers measures a first signal on the winding.
Preferably, the switching value isolation acquisition unit comprises s switching state signal conversion circuits, each switching value signal conversion circuit comprises an anti-interference circuit, a filter circuit and a photoelectric coupling circuit, and the anti-interference circuit is used for reducing the interference of common-mode noise to input signals; the filter circuit is used for filtering an external interference signal input from the signal input end; and the photoelectric coupling circuit is used for isolating and converting the filtered strong current switch state signal into a weak current level signal.
Preferably, in the processor, the preset conditions are: the switch state signal is the closing position; the current signal of the transformer is accumulated for six times, wherein the accumulated time is between fifty percent and seventy percent of the preset current value, or the current signal received by the transformer is more than seventy percent of the preset current value.
Preferably, the preset current value is a limit current value of the transformer.
Preferably, the monitoring device further comprises an FPGA acquisition module, and the FPGA acquisition module is configured to add a timestamp to the transmitted signal, obtain a third signal, and transmit the third signal to the processor.
Preferably, the monitoring device further comprises a memory for storing signal data after processing by the processor.
10. A transformer short circuit impact monitoring method is characterized by comprising the following steps:
s1: acquiring a current signal and a switch state signal of a transformer;
s2: judging and judging the switch state signals of each side of the transformer, and if the switch positions of each side of the transformer are closed positions, entering the step S3;
s3: and judging the relation between the current signal and the preset current value, and if the current signal accumulation exceeds six times and is between fifty percent and seventy percent of the preset current value, or the current signal exceeds seventy percent of the preset current value, sending an alarm signal.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the transformer short-circuit impact monitoring method and the monitoring device provided by the embodiment of the invention can acquire transformer short-circuit impact data in real time, automatically record the amplitude and the frequency of short-circuit impact voltage and current, and automatically alarm when the short-circuit impact voltage and the current exceed the specified threshold, and have the advantages of high accuracy, simplicity in operation and high efficiency compared with manual fault information extraction.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic view of a monitoring device
FIG. 2 is a schematic diagram of an analog signal conditioning unit
FIG. 3 is a schematic diagram of a switch isolation acquisition unit
FIG. 4 is a flow chart of a processor process
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present invention.
Example one
The embodiment discloses a transformer short circuit impact monitoring device, which comprises a signal processing unit, an AD module and a processor; in this embodiment, the output terminal of the signal processing unit is connected to the input terminal of the AD module,
the signal processing unit is used for acquiring a first signal of the transformer, analyzing and processing the first signal and inputting an obtained second signal into the AD module; in this embodiment, the collected first signal is a voltage signal, a current signal and a switch state signal, the collected analog signal is input to the AD module, the AD module converts the analog signal into a numerical signal and outputs the numerical signal, and if the signal is the switch state signal, the AD module converts the switch state signal into a high-low level signal and outputs the signal.
In this embodiment, the signal processing unit includes an analog signal conditioning unit and a switching value isolation acquisition unit, where the analog signal conditioning unit is configured to acquire an analog signal of the transformer, perform standardization processing on the analog signal, and send the processed signal to the AD module; the switching value isolation acquisition unit is used for acquiring a switching state signal of the transformer, converting the switching state signal into a level signal and inputting the level signal into the AD module.
In this embodiment, as shown in fig. 2, the analog signal conditioning unit includes m transformer boards, n transformers are disposed on each transformer board, each transformer board is configured to measure an analog signal of a corresponding winding, and each transformer measures a first signal on the winding.
In a transformer system, there are several windings, which refer to a set of turns constituting an electrical line corresponding to a certain voltage value noted by the transformer. The terminal voltage of each secondary winding is different when the number of turns of the secondary winding is different, so that the multi-winding transformer can supply power to several electric devices with different voltages. Therefore, every winding all has different voltage signal, analog quantity signals such as current signal, in this embodiment, a mutual-inductor board that sets up just corresponds the analog quantity signal of measuring a winding, set up a plurality of mutual-inductors on the mutual-inductor board, a plurality of mutual-inductors of setting can be used for measuring the different analog quantity signals on the winding, and convert measured analog quantity signal into the signal output of the unified virtual value of system, be convenient for insert mainframe AD sampling board simultaneously, the electric isolation of analog quantity sampling signal has thoroughly been realized, guarantee the safe and reliable of sampling data.
The AD module is used for converting the second signal into a numerical value signal and transmitting the numerical value signal to the processor;
in this embodiment, as shown in fig. 3, the switching value isolation and acquisition unit includes s switching state signal conversion circuits, each switching value signal conversion circuit includes an anti-interference circuit, a filter circuit, and a photoelectric coupling circuit, and the anti-interference circuit is configured to reduce interference of common mode noise on an input signal; the filter circuit is used for filtering an external interference signal input from the signal input end; the photoelectric coupling circuit is used for isolating and converting the strong current (such as 110V/220V) switch state signal after filtering into a weak current (such as 24V) level signal.
In the transformer, a plurality of groups of switches exist, each group of switches needs to be measured by a corresponding switch state signal conversion circuit, the measured switch signals judge whether the corresponding transformer is an air-drop transformer, and if the corresponding transformer is not the air-drop transformer, the acquired analog quantity signals are processed.
In the processor, the preset conditions are as follows: the switch state signal is the closing position; the current signal of the transformer is accumulated for six times, wherein the accumulated time is between fifty percent and seventy percent of the preset current value, or the current signal received by the transformer is more than seventy percent of the preset current value. The preset current value is the limit current value of the transformer.
The processor is used for analyzing and judging the numerical signal, judging whether the numerical signal meets a preset condition or not, and triggering the alarm module to give an alarm if the numerical signal meets the preset condition.
In the processor of this embodiment, the following processing is performed on the transmitted analog signal:
as shown in fig. 4, firstly, the switch state signal is determined, and then, whether the switch position of the transformer is a closed position is determined, if not, the transformer is an air-drop transformer; secondly, comparing the obtained current signal with the limit current value of the transformer, judging the ratio between the magnitude of the current signal and the limit current value, seeing in which range the ratio is, if the ratio is between fifty percent and seventy percent, judging the number of times that the obtained current signal is between fifty percent and seventy percent of the limit current value before, and if the accumulated number of times exceeds six times, sending an alarm signal; if the range of the ratio exceeds seventy percent, an alarm signal is directly sent out.
In this embodiment, the monitoring device further includes an FPGA acquisition module, where the FPGA acquisition module is configured to add a timestamp to the transmitted signal, obtain a third signal, and transmit the third signal to the processor.
In the FPGA acquisition module provided in this embodiment, an input of the a/D module is read, a timestamp accurate to microseconds is stamped on data, the data is cached in the internal RAM, and then the data is sent to the CPU processing module through the internal gigabit network port; the monitoring device also includes a memory for storing signal data after processing by the processor.
The transformer short-circuit impact monitoring device provided by the embodiment can acquire transformer short-circuit impact data in real time, automatically record the amplitude and the frequency of short-circuit impact voltage and current, automatically alarm when the short-circuit impact voltage and the current exceed a specified threshold value, and has the advantages of high accuracy, simplicity in operation and high efficiency compared with manual fault information extraction.
Example two
The embodiment discloses a transformer short circuit impact monitoring method, which is a monitoring method implemented based on the device of the embodiment, and comprises the following steps:
s1: acquiring a current signal and a switch state signal of a transformer;
s2: judging the switch state signals of each side of the transformer, if the switch positions of each side of the transformer are closed positions, which indicates that the transformer does not belong to an air-drop transformer, entering step S3;
if the signal of the medium-voltage side switch or the low-voltage side switch of the transformer is an open position, and the position of the high-voltage side switch is converted from the open position to a closed position, the transformer belongs to the air-drop transformer.
And the switch state judging signal is mainly used for judging whether the transformer is an air-drop transformer or not, and if the switch state of the transformer is an on position, the transformer is an air-drop transformer.
S3: and judging the relation between the current signal and the preset current value, and if the current signal accumulation exceeds six times and is between fifty percent and seventy percent of the preset current value, or the current signal exceeds seventy percent of the preset current value, sending an alarm signal.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A transformer short circuit impact monitoring device is characterized by comprising a signal processing unit, an AD module and a processor;
the signal processing unit is used for acquiring a first signal of the transformer, analyzing and processing the first signal and inputting an obtained second signal into the AD module;
the AD module is used for converting the second signal into a numerical value signal and transmitting the numerical value signal to the processor;
the processor is used for judging the numerical value signal and a preset current value, judging whether the numerical value signal meets a preset condition or not, and triggering an alarm module to give an alarm if the numerical value signal meets the preset condition.
2. The transformer short circuit surge monitoring device of claim 1, wherein the first signal comprises a voltage signal, a current signal and a switch state signal.
3. The transformer short-circuit impact monitoring device according to claim 2, wherein the signal processing unit comprises an analog signal conditioning unit and a switching value isolation acquisition unit, the analog signal conditioning unit is configured to acquire an analog signal of the transformer, normalize the analog signal, and send the processed signal to the AD module;
the switching value isolation acquisition unit is used for acquiring a switching state signal of the transformer, converting the switching state signal into a level signal and inputting the level signal into the AD module.
4. The transformer short circuit impact monitoring device according to claim 3, wherein the analog signal conditioning unit comprises m transformer boards, and n transformers are disposed on each transformer board, each transformer board is configured to measure an analog signal of a corresponding winding, and each transformer measures the first signal on the winding.
5. The transformer short-circuit impact monitoring device according to claim 3, wherein the switching value isolation acquisition unit comprises s switching state signal conversion circuits, each switching value signal conversion circuit comprises an anti-jamming circuit, a filter circuit and a photoelectric coupling circuit, and the anti-jamming circuit is used for reducing the interference of common-mode noise on an input signal; the filter circuit is used for filtering an external interference signal input from the signal input end; and the photoelectric coupling circuit is used for isolating and converting the filtered strong current switch state signal into a weak current level signal.
6. The transformer short circuit impact monitoring device according to claim 2, wherein in the processor, the preset conditions are as follows: the switch state signal is the closing position; the current signal of the transformer is accumulated for six times, wherein the accumulated time is between fifty percent and seventy percent of the preset current value, or the current signal received by the transformer is more than seventy percent of the preset current value.
7. The transformer short-circuit impact monitoring device according to claim 6, wherein the preset current value is a limit current value of the transformer.
8. The transformer short circuit impact monitoring device according to claim 1, further comprising an FPGA acquisition module, wherein the FPGA acquisition module is configured to add a timestamp to the transmitted signal, obtain a third signal, and transmit the third signal to the processor.
9. The transformer short-circuit impact monitoring device according to claim 8, further comprising a memory for storing signal data after being processed by the processor.
10. A transformer short circuit impact monitoring method is characterized by comprising the following steps:
s1: acquiring a current signal and a switch state signal of a transformer;
s2: judging and judging the switch state signals of each side of the transformer, and if the switch positions of each side of the transformer are closed positions, entering the step S3;
s3: and judging the relation between the current signal and the preset current value, and if the current signal accumulation exceeds six times and is between fifty percent and seventy percent of the preset current value, or the current signal exceeds seventy percent of the preset current value, sending an alarm signal.
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| CN202111448147.3A CN114113862A (en) | 2021-11-30 | 2021-11-30 | Transformer short circuit impact monitoring method and monitoring device |
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| CN202111448147.3A CN114113862A (en) | 2021-11-30 | 2021-11-30 | Transformer short circuit impact monitoring method and monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116127163A (en) * | 2023-04-14 | 2023-05-16 | 国网江西省电力有限公司电力科学研究院 | Anti-interference power transformer short circuit impact analysis system and method |
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| CN112816917A (en) * | 2021-04-16 | 2021-05-18 | 成都工百利自动化设备有限公司 | Transformer impact monitoring device |
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| CN102565524A (en) * | 2012-03-15 | 2012-07-11 | 江苏省电力公司常州供电公司 | Real-time monitoring method for short-circuit current of near zone of transformer |
| CN108603907A (en) * | 2016-02-03 | 2018-09-28 | 通用电气公司 | System and method for monitoring and diagnosing transformer health |
| US20200309829A1 (en) * | 2019-04-01 | 2020-10-01 | Dake He | On-line monitoring system for the performance of the measurement equipment in the entire power grid based on wide-area synchronous measurement |
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| CN116127163A (en) * | 2023-04-14 | 2023-05-16 | 国网江西省电力有限公司电力科学研究院 | Anti-interference power transformer short circuit impact analysis system and method |
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