CN106092309A - The analysis extracting method of power transformer load tap changer and body vibration signal - Google Patents
The analysis extracting method of power transformer load tap changer and body vibration signal Download PDFInfo
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- CN106092309A CN106092309A CN201510216581.7A CN201510216581A CN106092309A CN 106092309 A CN106092309 A CN 106092309A CN 201510216581 A CN201510216581 A CN 201510216581A CN 106092309 A CN106092309 A CN 106092309A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004458 analytical method Methods 0.000 title claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 9
- 238000000605 extraction Methods 0.000 claims description 2
- 239000000284 extract Substances 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 230000007257 malfunction Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000002405 diagnostic procedure Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Abstract
The present invention is the analysis extracting method of a kind of power transformer load tap changer and body vibration signal, comprises the following steps: (1) gathers the complex vibration signal closing on transformer mailbox surface at load ratio bridging switch；(2) carry out inversefouriertransform after high-pass filtering being carried out to complex vibration signal, obtain load ratio bridging switch and operate the vibration signal causing；(3) the vibration time-domain signal causing complex vibration signal and load ratio bridging switch operation carries out time-domain difference computing, obtains the vibration signal of power transformer body.The present invention can be by carrying out high-pass filtering and time domain calculus of differences to the tank surface vibration signal recording, analyze and extract the vibration signal obtaining load ratio bridging switch and body, such that it is able to diagnose the situation of load ratio bridging switch and body respectively, ensure the safe and reliable operation of power transformer.
Description
The invention belongs to measurement and the analysis technical field of power equipment vibration signal, particularly to a kind of power transformer load tap changer and body analysis of vibration signal extracting method.
In the various equipment of power system, transformer is costly and one of critically important equipment, and its safe operation is to ensureing that power grid security is significant.Calendar year statistics data about power transformer shows, winding is one of the more parts that break down, and the rejected region of transformer is mainly manifested in iron core, lead-in wire and sleeve pipe.Additionally, on-load tap changers of transformers is the mechanical switching device of widely used regulation voltage in electrical network, owing to load ratio bridging switch is the parts uniquely running at high voltage, big electric current in transformer, its rate of breakdown is also higher.According to Operational Data Analysis both domestic and external, load ratio bridging switch fault occupies the 41% of load tapping transformer fault, is the one of the main reasons causing Accident of Transformer.In order to enable to find the accident potential of transformer in time, avoid burst accident, the security reliability improving transformer operation, carry out transformer body (including winding and iron core) and load ratio bridging switch on-line monitoring is significant with the research of diagnostic method.
During power transformer stable operation, body produces vibration under winding electric field force and iron core mangneto telescopic action, and the action of load ratio bridging switch also can produce bigger vibration signal.The vibration of body and load ratio bridging switch is delivered to oil tank of transformer by transformer body and transformer oil, causes the vibration of fuel tank.The vibration on oil tank of transformer surface and the compression situation of transformer body and deformation, load tap changer contact situation are closely related.Therefore, the situation of its body and load tap changer contact can be monitored by the tank surface vibration signal of on-line measurement transformer.Compared with existing transformer body and load ratio bridging switch malfunction monitoring technology, the great advantage of analysis of vibration signal method is can to come on-line monitoring body and load tap changer contact situation by the vibrating sensor being attached on oil tank of transformer surface, it is not electrically connected with whole power system, any impact is not had on the properly functioning of whole system, can reliably and securely reach the purpose of on-line monitoring.Analysis of vibration signal method not only can detect that winding deformation fault, also can detect that the looseness fault etc. of iron core, folder and other structural members, and meanwhile, the detection to OLTC contact failure also can realize.
Chinese scholars has been used for transformer body to vibratory drilling method and the diagnosis of load ratio bridging switch fault has carried out numerous studies, the key issue that the main needs existing solve is exactly: when diagnosing load ratio bridging switch situation, load ratio bridging switch must operate, and at this moment record at tank surface is the complex vibration signal of the clearly vibration signal of the load ratio bridging switch vibration signal that causes of operation and body, therefrom must analyze the vibration signal extracting load ratio bridging switch and body respectively, so as to more direct judge to transformer fault position and reason.
For the analysis of load ratio bridging switch and the vibration signal of body is extracted, a large amount of actual measurement vibration data can be accumulated, then the method that surface vibration model is set up is used, but only obtain its Mathematical Modeling, owing in reality, transformer vibration signal influence factor is numerous, the analysis of the vibration signal that the model therefore set up is difficult to directly apply to actual motion power transformer load tap changer and body is extracted；And using more is to store vibration signal when properly functioning for the transformer, vibration signal as its body, then the measurement vibrated again when load ratio bridging switch operates, the vibration signal obtaining is deducted previously obtained properly functioning when vibration signal data, i.e. can get the vibration signal of load ratio bridging switch, although this method is theoretical rationally, but must assure that when practice measuring the vibration signal obtaining twice has synchronism, and the vibration signal of body keeps constant when ensureing that load ratio bridging switch operation is front and operates, application has significant limitation.Therefore, there is shortcomings in existing techniques or methods, it is difficult to well effectively analyzes extraction to the vibration signal of power transformer load tap changer and body.
For above-mentioned situation, in order to overcome the defect of prior art, it is an object of the invention to provide a kind of analysis from the complex vibration signal on the oil tank of transformer surface recording and extract load ratio bridging switch and the method for body vibration signal, can effectively solve the separation problem of load ratio bridging switch and body vibration signal, thus respectively to load ratio bridging switch and body diagnosing malfunction, determine trouble location, ensure the safe and reliable operation of power transformer.
To achieve these goals, the concrete technical scheme of the present invention is:
The analysis extracting method of power transformer load tap changer and body vibration signal, comprises the following steps:
(1) complex vibration signal is gathered: when load ratio bridging switch operates, utilize Vibration-Measuring System to measure the vibration signal being close in each phase loaded tap switch oil case surface, collect the complex vibration signal of the vibration signal including the on-load shunting switch vibration signal that causes of operation and the properly functioning middle body of transformer；
(2) high-pass filtering and load ratio bridging switch vibration signal obtain: the complex vibration signal that step (1) collects is carried out high-pass filtering process, then carry out inversefouriertransform to filtered frequency-region signal, gained time-domain signal is and records the vibration signal that in complex vibration signal, load ratio bridging switch operation causes；
(3) time-domain signal difference and body vibration signal obtain: the vibration time-domain signal that the load ratio bridging switch operation of complex vibration signal and isolated causes is carried out time-domain difference computing, then obtaining one group of new time-domain signal, this is the vibration signal of power transformer body.
The present invention is further improved by: in step (1) when load ratio bridging switch operates, and measurement in the range of tank surface a diameter of 5cm around the nearest point of load ratio bridging switch is close in the vibration signal on each phase loaded tap switch oil case surface.
The present invention is further improved by: carry out the high-pass filtering process that cut-off frequency is 600～800Hz in step (2) to the complex vibration signal collecting, then inversefouriertransform is carried out to filtered frequency-region signal, obtain the time-domain signal of 600Hz～800Hz frequencies above component in complex vibration signal, be and record the vibration signal that in complex vibration signal, load ratio bridging switch operation causes
Relative to prior art, the invention have the advantages that the present invention by the vibration signal being close in each phase loaded tap switch oil case surface recording, isolated load ratio bridging switch and the vibration signal of body, such that it is able to diagnose the situation of load ratio bridging switch and body respectively, ensure the safe and reliable operation of power transformer.
Fig. 1 is the schematic flow sheet of the method for the present invention.
Fig. 2 is that the actually measured oil tank of transformer surface of the present embodiment is close in the vibration signal at A phase load ratio bridging switch.
Fig. 3 is that the load ratio bridging switch that the present embodiment obtains operates the vibration signal figure causing.
Fig. 4 is that the transformer body vibration signal figure obtaining is extracted in the present embodiment analysis.
Fig. 5 is the vibration signal that in this example, load ratio bridging switch records when not operating.
Describe technical scheme below in conjunction with the accompanying drawings in detail.
Analyzing from the complex vibration signal on the oil tank of transformer surface recording that the present invention proposes extracts load ratio bridging switch and the method for body vibration signal, and concrete steps flow process is as shown in Figure 1.
Describe in detail as follows in conjunction with drawings and Examples, the analysis extracting method of a kind of power transformer load tap changer of the present invention and body vibration signal, comprise the following steps:
(1) on-the-spot at main transformer of transformer substation, utilize Vibration-Measuring System to measure the vibration signal on the oil tank of transformer surface near load ratio bridging switch position, collect the one group of complex vibration signal including load ratio bridging switch and body vibration.Complex vibration time domain plethysmographic signal during the A phase load ratio bridging switch operation that the present embodiment measurement obtains is as shown in Figure 2.By in Fig. 2 it will be seen that at the time interval of 0.2～0.3s, time-domain signal significantly increases, and compared with other periods, cyclic variation, this illustrates to be compounded with in the vibration signal of this part the vibration signal of load ratio bridging switch.
(2) complex vibration signal is carried out the high-pass filtering that cut-off frequency is 600Hz, and inversefouriertransform is carried out to filtered frequency-region signal, obtain the time-domain signal of 600Hz frequencies above component in complex vibration signal, here it is record load ratio bridging switch in vibration signal to operate the vibration signal causing, as shown in Figure 3.It can be seen in figure 3 that the vibration signal of load ratio bridging switch due to its operate swiftness, be the high-frequency vibration signal that envelope is transient state impingement, this is consistent with actual conditions.
(3) the vibration time-domain signal that the load ratio bridging switch operation of complex vibration signal and isolated causes being carried out time-domain difference computing, then obtaining one group of new time-domain signal, this is the vibration signal of body, as shown in Figure 4.Extracting the body vibration signal obtaining periodically very by force it can be seen from figure 4 that analyze, a cycle duration is about 0.1s, and this is also identical with the feature that actual body vibration signal fundamental frequency is 100Hz.
Extract the vibration signal of load ratio bridging switch and body in order to verify that this method is effectively analyzed.The present embodiment carries out the vibration measurement on oil tank of transformer surface when load ratio bridging switch is failure to actuate, and has obtained the vibration signal of body, as shown in Figure 5.Fig. 5 and Fig. 4 are compared it appeared that, analyze the body vibration signal waveforms recording when the body vibration signal extracting is failure to actuate with load ratio bridging switch substantially coincident, calculating waveform similarity coefficient is 0.989, illustrate that the two is highly similar, more demonstrating Fig. 4 is exactly to analyze the body vibration signal extracting, thus has also turned out the correctness analyzing the load ratio bridging switch vibration signal extracting.Certainly, relatively can be seen that from Fig. 4 and Fig. 5, the amplitude of body vibration signal is simultaneously not completely equivalent, this is just because of the vibration signal that the vibration signal of isolated body signal and the body surveyed later is not a moment, so still there is certain otherness in the two, this just more demonstrates, body Vibration Condition when body vibration signal can not reflect load ratio bridging switch action completely when being failure to actuate only by measurement load ratio bridging switch, simultaneously, this also illustrates the on-load tap changers of transformers of present invention proposition and body analysis of vibration signal extracting method can successfully and in real time by load ratio bridging switch and body Signal separator come, more superior than other methods.
Claims (3)
1. the analysis extracting method of power transformer load tap changer and body vibration signal, it is characterised in that comprise the following steps:
(1), complex vibration signal is gathered: when load ratio bridging switch operates, utilize Vibration-Measuring System to measure the vibration signal being close in each phase loaded tap switch oil case surface, collect the complex vibration signal of the vibration signal including the on-load shunting switch vibration signal that causes of operation and the properly functioning middle body of transformer；
(2), high-pass filtering and load ratio bridging switch vibration signal obtain: the complex vibration signal collecting step 1 carries out high-pass filtering process, then carry out inversefouriertransform to filtered frequency-region signal, gained time-domain signal is and records the vibration signal that in complex vibration signal, load ratio bridging switch operation causes；
(3), time-domain signal difference and body vibration signal obtain: the vibration time-domain signal that the load ratio bridging switch operation that complex vibration signal and analysis extraction obtain causes is carried out time-domain difference computing, then obtaining one group of new time-domain signal, this is the vibration signal of power transformer body.
2. power transformer load tap changer according to claim 1 and body analysis of vibration signal extracting method, it is characterized in that, in step 1 when load ratio bridging switch operates, measurement in the range of tank surface a diameter of 5cm around the nearest point of load ratio bridging switch is close in the vibration signal on each phase loaded tap switch oil case surface.
3. power transformer load tap changer according to claim 1 and body analysis of vibration signal extracting method, it is characterized in that, the complex vibration signal collecting is carried out the high-pass filtering process that cut-off frequency is 600～800Hz by step 2, then inversefouriertransform is carried out to filtered frequency-region signal, obtain the time-domain signal of 600Hz～800Hz frequencies above component in complex vibration signal, be and record the vibration signal that in complex vibration signal, load ratio bridging switch operation causes.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015140A (en) * | 2017-03-13 | 2017-08-04 | 南京航空航天大学 | A kind of analysis of vibration signal method for failure that load ratio bridging switch spring kinetic energy is not enough |
| CN108593099A (en) * | 2018-04-28 | 2018-09-28 | 国家电网公司 | A kind of on-load regulator transformer tap switch vibration signal extracting method |
| CN109738168A (en) * | 2018-11-22 | 2019-05-10 | 国网宁夏电力有限公司检修公司 | Compare the method that each phases-time of on-load voltage regulating switch carries out fault diagnosis |
| CN109738056A (en) * | 2019-01-04 | 2019-05-10 | 红相股份有限公司 | A kind of load ratio bridging switch machine performance signal characteristic extracting methods |
| CN110161363A (en) * | 2019-06-20 | 2019-08-23 | 广东石油化工学院 | Running state of transformer vibration sound detection method and system based on dominant frequency token state |
| WO2021070437A1 (en) * | 2019-10-08 | 2021-04-15 | 株式会社日立製作所 | Transformer monitoring and diagnostic device |
-
2015
- 2015-04-27 CN CN201510216581.7A patent/CN106092309A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015140A (en) * | 2017-03-13 | 2017-08-04 | 南京航空航天大学 | A kind of analysis of vibration signal method for failure that load ratio bridging switch spring kinetic energy is not enough |
| CN108593099A (en) * | 2018-04-28 | 2018-09-28 | 国家电网公司 | A kind of on-load regulator transformer tap switch vibration signal extracting method |
| CN108593099B (en) * | 2018-04-28 | 2020-08-14 | 国家电网公司 | Tapping switch vibration signal extraction method for on-load tap changer |
| CN109738168A (en) * | 2018-11-22 | 2019-05-10 | 国网宁夏电力有限公司检修公司 | Compare the method that each phases-time of on-load voltage regulating switch carries out fault diagnosis |
| CN109738056A (en) * | 2019-01-04 | 2019-05-10 | 红相股份有限公司 | A kind of load ratio bridging switch machine performance signal characteristic extracting methods |
| CN110161363A (en) * | 2019-06-20 | 2019-08-23 | 广东石油化工学院 | Running state of transformer vibration sound detection method and system based on dominant frequency token state |
| WO2021070437A1 (en) * | 2019-10-08 | 2021-04-15 | 株式会社日立製作所 | Transformer monitoring and diagnostic device |
| JP2021061337A (en) * | 2019-10-08 | 2021-04-15 | 株式会社日立製作所 | Transformer monitoring and diagnostic device |
| JP7212602B2 (en) | 2019-10-08 | 2023-01-25 | 株式会社日立製作所 | Transformer monitoring diagnostic equipment |
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