CN201514463U - Looseness fault diagnostic device for switching contact of on-load tapping changing switch of power transformer - Google Patents
Looseness fault diagnostic device for switching contact of on-load tapping changing switch of power transformer Download PDFInfo
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- CN201514463U CN201514463U CN 200920230765 CN200920230765U CN201514463U CN 201514463 U CN201514463 U CN 201514463U CN 200920230765 CN200920230765 CN 200920230765 CN 200920230765 U CN200920230765 U CN 200920230765U CN 201514463 U CN201514463 U CN 201514463U
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Abstract
The utility model relates to a looseness fault diagnostic device for a switching contact of an on-load tapping changing switch of a power transformer, which is characterized in that a vibration sensor is arranged on the tapping changing switch of the power transformer, the output end of the vibration sensor is connected with the input end of a collection instrument, the output end of the collection instrument is connected with the input end of a signal processor, the output end of the signal processor is connected with a display, and the vibration sensor is arranged at the top end of the tapping changing switch. The utility model has the advantages that the detected fault characteristic quantity can accurately reflect the looseness fault of the switching contact of the tapping changing switch, the characteristics are obvious, the repetitiveness is good, and the utility model has the universality on the tapping changing switches of the same type. The realization of the looseness fault diagnostic technical engineering of the switching contact of the on-load tapping changing switch is simple, and the installation of the sensor is convenient. A microcomputer (an industrial control computer) is used for detection, processing and diagnosis, and the utility model has the advantages of reliable performance, convenient realization and direct viewing diagnostic results.
Description
Technical field
The utility model relates to a kind of power transformer load tap changer switching contact slap trouble-shooter, belong to electrical control engineering field.
Background technology
To become the inexorable trend of future development based on the state maintenance strategy of on-line monitoring and fault diagnosis technology.ULTC is a very important power transmission and transforming equipment in the electric system, it can not only the steady load center voltage, and be indispensable visual plants such as contact electrical network, adjustment load trend, the no distribution of work of improvement, in electrical network, obtained using widely.
At present a large amount of 110kV and above transformer have all been installed load ratio bridging switch, and (On-Load TapChanger, OLTC), its function is to finish the transformer pressure regulation under the bringing onto load state.The running status of load ratio bridging switch directly has influence on the operation of power transformer, the adjusting of electric system and the height of the quality of power supply.According to statistics, the load ratio bridging switch fault is one of main fault of power transformer, and failure rate is only second to winding failure.And along with the increase of increasing of in electrical network, using of ULTC and the average daily pressure regulation number of times of separate unit shunting switch, the increase trend that the fault of load ratio bridging switch has.Carry out the status monitoring and the fault diagnosis of shunting switch, find that in time shunting switch is unusual, significant to safe operation of power system, and have a good application prospect.
Contact slap is one of main fault of tapping switch for electric power transformer.The repeated stock of holding capacity in the shunting switch handoff procedure causes contact slap after repeatedly switching, as untimely diagnosis, even can cause that contact comes off.After contact came off, very big working current had to independently bear (shunting switch double-throw contact often two groups work side by side) by another group contact in handoff procedure.Another group contact seriously transships, generates heat, and as untimely discovery, will very fast the shunting switch contact be burnt, and whole switch and transformer can't be worked.In addition, behind the contact slap, switching contact is loose contact in handoff procedure, causes serious electric arc, also makes easily to switch to burn.
At present the fault to shunting switch does not also have the reliable diagnostic method, and the method in the research mainly contains method (as three-ratio method) based on dissolved gas analysis, based on the monitoring of vibration and analytical approach, based on the diagnostic method of thermonoise etc.But, therefore, realize based on the analytical approach of gas in the oil is very difficult at present because under the shunting switch normal operating condition, deciliter action because of the contact also can produce corresponding gas in the oil; Diagnosis based on thermonoise is because the thermonoise that heating produces after the sub-connecting switch of transformer fault propagates into the transformer outside, detect and carry out the shunting switch fault diagnosis by noise transducer is installed on transformer case, this is based on the shunting switch contact on the one hand has obvious fault and has produced serious heating (slight heat can not produce tangible thermonoise), thermonoise propagates into the transformer outside on the other hand, the energy loss of signal is big, add various interference, be difficult on the engineering realize that (the various noises of transformer running environment are a lot, electromagnetic noise particularly, ground unrest is very big, much larger than the energy of the signal that passes to the oil tank of transformer outside that causes because of the contact fault is overheated); Owing to cause that the factor of vibration is a lot of in the shunting switch handoff procedure, vibration when particularly the gunlock of shunting switch moves is very big, bring difficulty to vibration analysis, therefore the key based on the shunting switch fault diagnosis of vibrating is to find in the monitor signal that about finding fault can reflect the characteristic signal of fault, in addition, monitoring method and monitoring back signal analysis method also influence the accuracy of the fault diagnosis of shunting switch.
Summary of the invention
The utility model proposes the power transformer load tap changer switching contact slap trouble-shooter, its purpose is intended to the problems referred to above of existing in the OLTC fault diagnosis, according to the OLTC operation characteristic, and in conjunction with its normal vibration characteristics different during with fault, found to reflect the characteristic signal of shunting switch switching contact slap fault through theoretical analysis and experiment, promptly after shunting switch switching contact slap fault, its vibration signal will produce the bigger spectral line of a tangible amplitude through suitably handling in the 800-1000Hz scope in frequency-region signal.Take monitoring and signal analysis method, according to whether containing this feature in the measured signal, whether the diagnosis shunting switch exists the contact slap fault, realizes the monitoring and diagnosis of shunting switch contact slap fault.
Technical solution of the present utility model: its structure is that vibration transducer is installed on sub-connecting switch of transformer, the output terminal of vibration transducer and the input end of Acquisition Instrument join, the output terminal of Acquisition Instrument and the input end of signal processor join, the output terminal of signal processor links to each other with display, signal processor can be replaced finishing with demonstration by a microcomputer (industrial computer), and vibration transducer is installed in the top of shunting switch.
Advantage of the present utility model: the fault signature amount of 1) being found can accurately reflect shunting switch switching contact slap fault, and feature is obvious, and good reproducibility through a large amount of experiment confirms, has good ubiquity to the shunting switch of same type.2) the load tap changer contact slap fault diagnosis engineering that increases based on spectral line peak value between the vibration frequency-region signal 800-1000Hz realizes that simply sensor is easy for installation.3) adopt industrial computer to detect, handle and diagnose, dependable performance, software is realized convenient, man-machine interface close friend, diagnosis is directly perceived.
Description of drawings
Fig. 1 is the structured flowchart of fault diagnosis system
Fig. 2 is the test block diagram of diagnostic system
Fig. 3 is the frequency domain figure of vibration signal under the shunting switch normal condition.
Fig. 4 is the frequency domain figure of vibration signal under the shunting switch switching contact slap malfunction.
Fig. 5 is the vibration signal frequency domain figure (embodiment 2) under the shunting switch switching contact normal condition.
Fig. 6 is the vibration signal frequency domain figure (embodiment 2) under the shunting switch switching contact slap malfunction.
Fig. 7 is the vibration signal frequency domain figure (embodiment 3) under the shunting switch switching contact normal condition.
Fig. 8 is that shunting switch switches the vibration signal frequency domain figure (embodiment 3) that touches under the looseness fault state.
Fig. 9 is the vibration signal frequency domain figure (embodiment 4) under the shunting switch switching contact normal condition.
Figure 10 is the vibration signal frequency domain figure (embodiment 4) under the shunting switch switching contact slap malfunction.
Among Fig. 11 is sub-connecting switch of transformer, the 2nd, and sensor, the 3rd, signal conditioning circuit, the 4th, Acquisition Instrument, the 5th, signal processor, the 6th, display (generally replacing signal processor 5 and display 6) with a computer generation
Embodiment
Contrast accompanying drawing 1, its structure is that vibration transducer 2 is installed on sub-connecting switch of transformer 1, sensor output signal send Acquisition Instrument 4 to gather after signal conditioning circuit 3 conversions, use Acquisition Instrument 4 to collect after the coherent signal, carry out signal analysis by signal processor 5, image and the diagnostic result that obtains shown on display 6.Annexation between them: sub-connecting switch of transformer 1 joins with the input end of sensor 2, the input end of the output terminal of sensor 2 and signal conditioning circuit 3 joins, the input end of the output terminal of signal conditioning circuit 3 and Acquisition Instrument 4 joins, the output terminal of Acquisition Instrument 4 inserts the input end of the signal processor 5 in the microcomputer, and the output terminal of signal processor 5 links to each other with display 6 in the microcomputer.
Described vibration transducer 2 is the piezoelectric type acceleration vibration transducer, and model is CA-YD-103.The piezoelectric type acceleration vibration transducer claims piezoelectric accelerometer again, and it is to utilize the piezoelectric effect of some crystalline material to make, and its output electric weight is proportional to the vibration acceleration value of testee.
Described Acquisition Instrument model is Gould 77-0801-NET, is a kind of high-accuracy general data collecting instrument, input signal is sampled, and can send computing machine with image data.
Signal processor 5 can be finished by analysis software by a common computer (microcomputer) with display 6.
Though vibration signal can be monitored from X, Y, three directions of Z, consider that from the monitoring convenience vibration transducer is installed in the top of shunting switch, mainly monitors the vibration signal of shunting switch vertical direction.When shunting switch switches, monitor its vibration signal, this signal is analyzed, is handled by computing machine, and carry out fault diagnosis through after the Acquisition Instrument collection.
Embodiment
In order to verify feasibility of the present invention; carry out following experiment; experiment with domestic application extremely widely M type load ratio bridging switch experimentize, the shunting switch model is CMIII-500-63B-10193W (for the production of the load ratio bridging switch manufacturing enterprise Shanghai Huaming Electric Appliance Equipment Co., Ltd of domestic maximum).The basic parameter of this switch sees Table 1.
Table 1 experiment shunting switch basic parameter table
| Maximum rated by electric current (A) | 500 | The number of phases and connected mode | Three-phase Y connection |
| Maximum level voltage (V) | 3300 | The working position number | 19 |
| Amount electric pressure (kV) | 63 | The class of insulation | B |
| Specified level capacity (kVA) | 1400 |
Experimental provision also comprises the acceleration vibration transducer, the high data collecting instrument of Buddhist nun, microcomputer etc.The acceleration vibration transducer is directly installed on the shunting switch top, and the high Acquisition Instrument of Buddhist nun is used for the collection and the record of signal, and PC is then carried out data-storing, data processing and fault diagnosis.And demonstrate the result on PC, the sample frequency of vibration signal is 50kHz.
In the vibration signal that collects, the peaked point of the energy signal of getting 4096 points (about 82ms) behind 200 points (4ms) of delaying time is backward analyzed from time-domain signal.
Normal shunting switch, the frequency spectrum of vibration signal can 4000Hz be that the boundary is divided into two parts roughly, and the zone that is lower than 4000Hz is called here than low frequency range, and the zone that is higher than 4000Hz is called the higher-frequency district.Than low frequency range, the frequency of the signal of signal amplitude maximum and does not have obviously big signal of amplitude generally between 300Hz-500Hz in the 800-1000Hz interval.
After shunting switch contact slap fault, carry out signal analysis as stated above, between the 800-1000Hz of frequency-region signal, increase an amplitude newly obviously greater than the amount of other frequency signal amplitude, the amplitude of this radio-frequency component is not only greater than the signal maximum in former normal condition 300-500Hz interval, and is the amplitude bigger (generally being maximum) of the signal of all frequencies under the fault state.
So, monitor signal carried out above-mentioned analysis after, if find the spectral line that amplitude obviously increases between frequency-region signal 800-1000Hz, to occur, can diagnose out this shunting switch to have the switching contact slap fault substantially; If the sample contrast (historical data) under the normal condition can be arranged, the peaked frequency of vibration frequency-region signal is originally between 300-500Hz, the current signal that monitors increases amplitude very big characteristic signal relatively newly between frequency 800-1000Hz, not only original than this interval value of its maximal value is significantly increased, and also greater than the amplitude of the signal between the 300-500Hz.Then can diagnose reliably, judge that there is the switching contact slap fault in this shunting switch.
Accompanying drawing 3,4 is respectively in the test under the shunting switch normal condition and shunting switch switching contact slap malfunction, the frequency-domain waveform figure of vibration signal during the shunting switch change action.
Comparison diagram 3 can find with Fig. 4, Fig. 3 just often, and maximum amplitude partly appears at 325Hz,
About 0.0338 (ordinate is after conversion such as vibration transducer, and the relative amplitude of the signal that obtains in signal sampler is together following) of amplitude.There is not the very big spectral line of obvious amplitude between the 800-1000Hz.
During fault (Fig. 4), the new spectral line that tangible amplitude maximum occurs between 970Hz, in this example, this spectral line amplitude reaches 0.076, and this spectral line amplitude is much larger than the amplitude of the maximum spectral line of original signal.
When the different gear of shunting switch, different operation conditions, the numerical value of the amplitude of above-mentioned characteristic signal is slightly variant, this is because as a kind of mechanical switch, mechanical property in the handoff procedure, vibration characteristics always have certain dispersiveness, but rule is identical (to be different operating modes, different duties, behind the double-throw contact looseness fault, always there is the signal of the obvious increase of an amplitude to exist in the 800-1000Hz interval).Vibration situation (frequency domain figure) when Fig. 5-Figure 10 is the switching of shunting switch under different conditions.Wherein Fig. 5, Fig. 7 and Fig. 9 are the vibration signal frequency spectrum of normal condition, and Fig. 6, Fig. 8, Figure 10 are the vibration signal frequency spectrum of switching contact slap state.As seen, rule is the same.
On the basis of theory analysis, carry out finding that above-mentioned feature has good repeatability and regularity after a large amount of measured tests.Verified that this feature can be used for the shunting switch contact slap fault diagnosis.
Claims (1)
1. power transformer load tap changer switching contact slap Fault Diagnosis device, it is characterized in that on sub-connecting switch of transformer, installing vibration transducer, the output terminal of vibration transducer and the input end of Acquisition Instrument join, the output terminal of Acquisition Instrument inserts the input end of the signal processor in the computing machine, the output terminal of signal processor links to each other with display in the computing machine, and vibration transducer is installed in the top of shunting switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920230765 CN201514463U (en) | 2009-09-08 | 2009-09-08 | Looseness fault diagnostic device for switching contact of on-load tapping changing switch of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920230765 CN201514463U (en) | 2009-09-08 | 2009-09-08 | Looseness fault diagnostic device for switching contact of on-load tapping changing switch of power transformer |
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| Publication Number | Publication Date |
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| CN201514463U true CN201514463U (en) | 2010-06-23 |
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| CN 200920230765 Expired - Fee Related CN201514463U (en) | 2009-09-08 | 2009-09-08 | Looseness fault diagnostic device for switching contact of on-load tapping changing switch of power transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331547A (en) * | 2011-07-12 | 2012-01-25 | 江苏镇安电力设备有限公司 | Transformer winding vibration on-line monitoring and fault diagnosis method |
| CN105116320A (en) * | 2015-08-24 | 2015-12-02 | 国家电网公司 | Gas insulated switchgear isolation switch contact state test and measurement system |
| CN105589010A (en) * | 2014-11-06 | 2016-05-18 | 罗伯特·博世有限公司 | Device and method used for identifying contact failure of batteries of battery pack |
| CN108490347A (en) * | 2018-05-24 | 2018-09-04 | 国网上海市电力公司 | A kind of breaker in extra high voltage arcing contact loosens the detection method of defect |
-
2009
- 2009-09-08 CN CN 200920230765 patent/CN201514463U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331547A (en) * | 2011-07-12 | 2012-01-25 | 江苏镇安电力设备有限公司 | Transformer winding vibration on-line monitoring and fault diagnosis method |
| CN105589010A (en) * | 2014-11-06 | 2016-05-18 | 罗伯特·博世有限公司 | Device and method used for identifying contact failure of batteries of battery pack |
| CN105116320A (en) * | 2015-08-24 | 2015-12-02 | 国家电网公司 | Gas insulated switchgear isolation switch contact state test and measurement system |
| CN105116320B (en) * | 2015-08-24 | 2018-08-03 | 国家电网公司 | A kind of gas insulated combined electrical equipment disconnecting switch contact condition experiment ＆ measurement system |
| CN108490347A (en) * | 2018-05-24 | 2018-09-04 | 国网上海市电力公司 | A kind of breaker in extra high voltage arcing contact loosens the detection method of defect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100623 Termination date: 20180908 |