CN205843807U - A kind of transformer DC magnetic bias state-detection Noise Acquisition device - Google Patents
A kind of transformer DC magnetic bias state-detection Noise Acquisition device Download PDFInfo
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- CN205843807U CN205843807U CN201620777225.2U CN201620777225U CN205843807U CN 205843807 U CN205843807 U CN 205843807U CN 201620777225 U CN201620777225 U CN 201620777225U CN 205843807 U CN205843807 U CN 205843807U
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Abstract
The utility model discloses a kind of transformer DC magnetic bias state-detection Noise Acquisition device, including the Noise Acquisition unit being sequentially connected, CPU, communication interface module and remote transmission module, Noise Acquisition unit includes microphone, preamplifier, signal amplification module, data acquisition module, A/D modular converter and continuous current source module, microphone, preamplifier, signal amplification module, data acquisition module, A/D modular converter is sequentially connected, the outfan of A/D modular converter is connected with CPU, the outfan of continuous current source module is connected with preamplifier.This utility model can provide underlying noise data for realizing the monitoring in real time of transformer DC magnetic bias state with early warning, without changing equipment running status, without contacting charging equipment, convenient test, safety is high, is conducive to improving the automaticity of Repair of Transformer work.
Description
Technical field
This utility model relates to electric power safety monitoring technical field, is specifically related to a kind of transformer DC magnetic bias state-detection
Use Noise Acquisition device.
Background technology
When ultra-high voltage converter station runs in one pole ground return circuit mode, the grounded neutral point of DC current flows into AC transformation
Device causes D.C. magnetic biasing problem.When there is D.C. magnetic biasing, transformer magnetizing current is distorted and produces a large amount of harmonic wave, magnetic unshakable in one's determination
By saturated, cause transformer noise and vibration aggravation, the safe operation of serious threat transformator.
In order to diagnose D.C. magnetic biasing problem, the method currently mainly used includes high voltage side of transformer neutral point electricity
Stream detection method and noise measuring method 2 kinds.Neutral point current detection method direct centering point direct current detects, to D.C. magnetic biasing
The accuracy of condition adjudgement is higher, but needs to change the method for operation of transformer neutral point before testing, will master to be detected
Becoming neutral ground disconnecting link pull open and install Hall element at earth terminal, the real-time therefore detected is poor with safety.Existing
Some noise detecting methods use sound meter measuring transformer sound pressure level, by the difference of transformator sound pressure level before and after D.C. magnetic biasing
Judging D.C. magnetic biasing state, the method relies on sense organ and judges, it is desirable to staff has abundant operating experience, straight in neutral point
Erroneous judgement is easily caused when flowing less.Additionally, existing detection method is required to staff goes to scene, due to impacted power transformation
Quantity of standing is many, distribution is wide, and the method lacks motility, and easily causing manpower wastes with material resources.
Utility model content
The technical problems to be solved in the utility model: for the problems referred to above of prior art, it is provided that one can be for realizing
The in real time monitoring of transformer DC magnetic bias state provides underlying noise data with early warning, it is not necessary to change equipment running status, without
Contact charging equipment, convenient test, safety is high, is conducive to the transformator improving the automaticity of Repair of Transformer work straight
Stream magnetic bias state-detection Noise Acquisition device.
In order to solve above-mentioned technical problem, the technical solution adopted in the utility model is:
A kind of transformer DC magnetic bias state-detection Noise Acquisition device, including the Noise Acquisition unit being sequentially connected,
CPU, communication interface module and remote transmission module, described Noise Acquisition unit includes microphone, preposition amplification
Device, signal amplification module, data acquisition module, A/D modular converter and continuous current source module, described microphone, preposition amplification
Device, signal amplification module, data acquisition module, A/D modular converter are sequentially connected, the outfan of described A/D modular converter and in
Central Processing Unit is connected, and the outfan of described continuous current source module is connected with microphone, preamplifier respectively.
Preferably, described microphone is installed on transformator without the side of chiller, and be positioned at 1/2 transformator height,
Distance transformator 0.3m.
Preferably, described signal amplification module is the instrument amplifier that amplification is constant.
Preferably, described communication interface module is RS485 communication module.
Preferably, described remote transmission module is GPRS wireless communication module.
This utility model transformer DC magnetic bias state-detection Noise Acquisition device has an advantage that this utility model
Including the Noise Acquisition unit being sequentially connected, CPU, communication interface module and remote transmission module, Noise Acquisition list
Unit includes microphone, preamplifier, signal amplification module, data acquisition module, A/D modular converter and continuous current source mould
Block, microphone, preamplifier, signal amplification module, data acquisition module, A/D modular converter be sequentially connected, A/D modulus of conversion
The outfan of block is connected with CPU, and the outfan of continuous current source module is connected with preamplifier, passes through noise
Collecting unit is capable of the precise acquisition of the noise to transformer station, it is possible to for realizing the real-time prison of transformer DC magnetic bias state
Survey with early warning provide underlying noise data, it is not necessary to change equipment running status, without contacting charging equipment, convenient test, safety
Property high, be conducive to improving the automaticity of Condition Maintenance Method of Transformer work.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of this utility model embodiment.
Marginal data: 1, Noise Acquisition unit；11, microphone；12, preamplifier；13, signal amplification module；14, number
According to acquisition module；15, A/D modular converter；16, continuous current source module；2, CPU；3, communication interface module；4、
Remote transmission module.
Detailed description of the invention
As it is shown in figure 1, the transformer DC magnetic bias state-detection Noise Acquisition device of the present embodiment includes being sequentially connected
Noise Acquisition unit 1, CPU 2, communication interface module 3 and remote transmission module 4, Noise Acquisition unit 1 includes
Microphone 11, preamplifier 12, signal amplification module 13, data acquisition module 14, A/D modular converter 15 and continuous current source
Module 16, microphone 11, preamplifier 12, signal amplification module 13, data acquisition module 14, A/D modular converter 15 are successively
Be connected, the outfan of A/D modular converter 15 is connected with CPU 2, the outfan of continuous current source module 16 respectively with
Microphone 11, preamplifier 12 are connected.The transformer DC magnetic bias state-detection Noise Acquisition device of the present embodiment passes through
Noise Acquisition unit 1 is capable of the precise acquisition of the noise to transformer station, it is possible to for realizing transformer DC magnetic bias state
Monitoring in real time provides underlying noise data with early warning, it is not necessary to change equipment running status, without contacting charging equipment, test side
Just, safety is high, is conducive to improving the automaticity of Condition Maintenance Method of Transformer work.
In the present embodiment, microphone 11 is installed on the transformator side without chiller, and it is high to be positioned at 1/2 transformator
Degree, distance transformator 0.3m, by the selection of above-mentioned position, it is possible to reduce the chiller noise of transformator to transformer body
The interference of noise signal, improves transformer body noise signal detection accuracy.Preamplifier 12 is for by microphone 11
Output signal is amplified.Signal amplification module 13 is the instrument amplifier that amplification is constant, instrument amplifier amplification
Constant, it is possible to the accuracy that promotion signal amplifies, prevent from causing signal distortion at amplifying element, in order to guarantee to realize transformator
The monitoring in real time of D.C. magnetic biasing state and the degree of accuracy of early warning.The sample frequency of data acquisition module 14 be 65536Hz, sampling time
Between be 0.125s, selected by above-mentioned parameter, it is possible to ensure the complete of audio frequency reducing while signal data amount of storage
All standing.A/D modular converter 15 uses single supply working method, the conversion accuracy of A/D modular converter 15 to be 16, simplifies and is
System power supply mode, it is ensured that data conversion accuracy.Continuous current source module 16 is for carrying with preamplifier 12 for microphone 11
For 4mA constant operation electric current, to drive microphone 11 normally to work with preamplifier 12.
In the present embodiment, CPU 2 can select single-chip microcomputer or other kinds of microprocessor as required.Logical
Communication interface module 3 is RS485 communication module, has that interface is simple, compatible good, the advantage of data transmission distance length of cable.Far
Journey transport module 4 is GPRS wireless communication module, has that network's coverage area is wide, the advantage of low cost, is suitable for the long distance of signal
From transmission；In addition 3G or 4G wireless communication module can also be selected according to actual needs.
The work process of the transformer DC magnetic bias state-detection Noise Acquisition device of the present embodiment is as follows: (1) is being leaned on
Microphone 11 is arranged in the nearly transformator side without chiller, is positioned at 1/2 transformator height, distance transformator 0.3m.Transformation
Device chiller noise level is suitable with transformer body, and radiating fin of transformer has certain stop for noise transmission and makees
With, select the side not containing chiller near transformator to arrange that noise measuring point can reduce chiller to transformer body
The interference of noise signal detection.(2) CPU 2 sends instruction acquisition transformer noise signal, microphone 11, front storing
Big device 12 and continuous current source module 16 cooperation realize noise signal receive capabilities and acoustical signal are converted into the signal of telecommunication, signal
The signal of telecommunication is amplified meeting data acquisition request by amplification module 13, and data acquisition module 14 is right with A/D modular converter 15
The signal of telecommunication carries out sampling and analogue signal be converted into digital signal input CPU 2.It should be noted that this enforcement
The transformer DC magnetic bias state-detection Noise Acquisition device of example is not rely on a certain specific direct current based on noise
Magnetic bias condition detection method.Such as, existing noise detecting method uses measuring transformer sound pressure level, before and after D.C. magnetic biasing
The diversity judgement D.C. magnetic biasing state of transformator sound pressure level, CPU 2 both can be with the difference of measuring transformer sound pressure level
Directly judge whether transformator is in D.C. magnetic biasing state；In addition other can also be used as required based on noise signal
D.C. magnetic biasing condition detection method, such as: digital electric signal is converted to sound pressure signal, carries out spectrum analysis also to sound pressure signal
Extracting the frequency spectrum of noise signals in the range of 2kHz, CPU 2 extracts D.C. magnetic biasing noise characteristic ginseng according to noise signal
Number, compares D.C. magnetic biasing noise characteristic parameter and the D.C. magnetic biasing noise characteristic parameter threshold preset, if D.C. magnetic biasing is made an uproar
Acoustic feature parameter exceedes D.C. magnetic biasing noise characteristic parameter threshold, then judge that transformator is in D.C. magnetic biasing state, otherwise judges
Transformator is in normal condition.Wherein, D.C. magnetic biasing noise characteristic parameter is the odd even subharmonic ratio of noise signal, and odd even time is humorous
Bob be in the range of frequency spectrum 2kHz 50Hz odd harmonic amplitude and with even-order harmonic amplitude and ratio.In addition it is also possible to according to
Needing to use other similar D.C. magnetic biasing noise characteristic parameters etc., the noise signal that even can also directly detection be obtained is defeated
Go out to monitoring center, monitoring center carry out transformer DC magnetic bias state-detection judgement, do not repeat them here.(3) central authorities
Testing result is transmitted to monitoring center through remote transmission module 4 by processing unit 2 by communication interface module 3.
The above is only preferred implementation of the present utility model, and protection domain of the present utility model is not limited merely to
Above-described embodiment, all technical schemes belonged under this utility model thinking belong to protection domain of the present utility model.Should refer to
Go out, for those skilled in the art, without departing from the some improvement under this utility model principle premise and
Retouching, these improvements and modifications also should be regarded as protection domain of the present utility model.
Claims (5)
1. a transformer DC magnetic bias state-detection Noise Acquisition device, it is characterised in that: include the noise being sequentially connected
Collecting unit (1), CPU (2), communication interface module (3) and remote transmission module (4), described Noise Acquisition unit
(1) microphone (11), preamplifier (12), signal amplification module (13), data acquisition module (14), A/D modulus of conversion are included
Block (15) and continuous current source module (16), described microphone (11), preamplifier (12), signal amplification module (13), number
Being sequentially connected according to acquisition module (14), A/D modular converter (15), the outfan of described A/D modular converter (15) and central authorities process
Unit (2) be connected, the outfan of described continuous current source module (16) respectively with microphone (11), preamplifier (12) phase
Even.
Transformer DC magnetic bias state-detection Noise Acquisition device the most according to claim 1, it is characterised in that: described
Microphone (11) is installed on the transformator side without chiller, and is positioned at 1/2 transformator height, distance transformator 0.3m.
Transformer DC magnetic bias state-detection Noise Acquisition device the most according to claim 1, it is characterised in that: described
Signal amplification module (13) is the instrument amplifier that amplification is constant.
Transformer DC magnetic bias state-detection Noise Acquisition device the most according to claim 1, it is characterised in that: described
Communication interface module (3) is RS485 communication module.
Transformer DC magnetic bias state-detection Noise Acquisition device the most according to claim 1, it is characterised in that: described
Remote transmission module (4) is GPRS wireless communication module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620777225.2U CN205843807U (en) | 2016-07-22 | 2016-07-22 | A kind of transformer DC magnetic bias state-detection Noise Acquisition device |
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| CN201620777225.2U CN205843807U (en) | 2016-07-22 | 2016-07-22 | A kind of transformer DC magnetic bias state-detection Noise Acquisition device |
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| CN205843807U true CN205843807U (en) | 2016-12-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271022A (en) * | 2017-05-31 | 2017-10-20 | 国网山西省电力公司电力科学研究院 | A kind of transformer vibration noise Integrated Measurement System |
-
2016
- 2016-07-22 CN CN201620777225.2U patent/CN205843807U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271022A (en) * | 2017-05-31 | 2017-10-20 | 国网山西省电力公司电力科学研究院 | A kind of transformer vibration noise Integrated Measurement System |
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