CN109612564A - Transformer winding state vibration monitoring device in a kind of short-circuit test - Google Patents
Transformer winding state vibration monitoring device in a kind of short-circuit test Download PDFInfo
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- CN109612564A CN109612564A CN201811639799.3A CN201811639799A CN109612564A CN 109612564 A CN109612564 A CN 109612564A CN 201811639799 A CN201811639799 A CN 201811639799A CN 109612564 A CN109612564 A CN 109612564A
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- transformer
- short
- monitoring device
- circuit test
- vibrating sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
- G01H1/12—Measuring characteristics of vibrations in solids by using direct conduction to the detector of longitudinal or not specified vibrations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
- Testing Relating To Insulation (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to transformer winding state vibration monitoring devices in a kind of short-circuit test, including vibration acquisition module interconnected and main control module, vibration acquisition module includes the vibrating sensor connecting with transformer, vibration acquisition module further includes analog-digital converter, the input terminal of analog-digital converter is connected to vibrating sensor, output end is connected to main control module by optical fiber, device further includes current-voltage sampling unit, the input terminal of the current-voltage sampling unit is connected to transformer, and output end is connected to main control module.Compared with prior art, collected vibration signal is converted to digital signal by the present invention on the spot, it is sent in control room by optical fiber, voltage and current signal are also acquired simultaneously, and auxiliary judgment is carried out to vibrational state, signal is uniformly processed using indoor main control module is controlled, to judge whether transformer winding has occurred deformation in short-circuit test.
Description
Technical field
The present invention relates to a kind of vibration monitoring devices, vibrate more particularly, to transformer winding state in a kind of short-circuit test
Monitoring device.
Background technique
Transformer is primary equipment important in electric system, operating status it is normal whether to entire electric system
Stabilization is of great significance.The electrical network capacity in China increasingly increases at present, and capacity of short circuit also constantly increases therewith, as power train
The operational reliability ever more important of the power transformer for core of uniting.Once the short-circuit tolerance of transformer is not up to standard, Ke Nengzao
At major accidents such as large-area power-cuts, huge economic loss is brought.Accident of Transformer statistical result showed in recent years becomes
Depressor anti-short circuit capability deficiency itself has become the most important reason of Accident of Transformer, brings to the stable operation of electric system
Great security risk.
The test of transformer sudden short circuit is that transformer monitors one of its quality the most effective means before factory, in early period
Experimental study and quality control aspect embodied irreplaceable advantage.Current State Grid Corporation of China is by sudden short circuit
Test is classified as the sampling observation project of transformer, has great importance for the promotion of transformer total quality.
It is to judge transformer by carrying out short-circuit current rush to transformer that sudden short circuit, which tests most important effect,
Mechanical stability, examination transformer itself bear the mechanical force of short circuit.When the anti-short circuit capability deficiency of transformer, winding coil
Deformation can be generated, if direct plungeing into operation is likely to result in security risk, therefore the machinery of winding whether can be effectively detected
State is to judge the important indicator of sudden short circuit experimental result.In existing transformer fault detection method, relatively conventional has
Action of low-voltage pulse analytic approach, short-circuit impedance analytic approach, frequency response analysis etc., these detection methods are based on winding and have occurred and that
Under the premise of obvious fault, judged by being detected to the electrical test of transformer value before and after short circuit experiment, is needed multiple
Repeat to test, and detection can not be effectively performed for some small winding deformation or distortion, it is also necessary to pass through
Cover is hung manually to determine winding situation.But it is numerous to be tested number transformer, and it is complex to hang cover process, many unconspicuous
Deformation needs veteran operator that can screen, and it is low to there is heavy workload, working efficiency in practical applications
The defects of.
Vibration monitoring method in recent years based on tank wall physical motion state starts to attract attention, transformer tank wall vibrations feelings
Condition is able to reflect the health status of winding, may determine that winding by installing the vibration information that vibrating sensor is monitored in tank wall
Whether deformation occurs, with electric system without being directly electrically connected, has the spies such as high sensitivity, small, the system operational safety of construction volume
Point.
Existing transformer vibration acquisition system is mostly unitary design, will by installing vibrating sensor on tank wall
Collected vibration signal is directly transferred in master control room, carries out processing analysis to these information by main control module.Acquisition system
The transformer vibrational state design being based under stable state, resolution ratio is lower with range, and system response time is slower, it is impossible to meet
The acquisition requirement of vibration signal in the case of sudden short circuit.Since surrounding enviroment are complex in short-circuit test, exist a large amount of electrical
Interference and other interference signals, the Electromagnetic Compatibility of acquisition device cannot be up to standard.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide become in a kind of short-circuit test
Depressor winding state vibration monitoring device.
The purpose of the present invention can be achieved through the following technical solutions:
Transformer winding state vibration monitoring device in a kind of short-circuit test, including vibration acquisition module interconnected and
Main control module, the vibration acquisition module include the vibrating sensor connecting with transformer, and the vibration acquisition module further includes
Analog-digital converter, the input terminal of the analog-digital converter are connected to vibrating sensor, and output end is connected to master control mould by optical fiber
Block, described device further include current-voltage sampling unit, and the input terminal of the current-voltage sampling unit is connected to transformer, output
End is connected to main control module.
The vibration acquisition module further includes contracting for low-pass filtering and by the collected electric signal amplitude of vibrating sensor
It puts to the signal conditioning circuit in the analog-digital converter input range, which is set to vibrating sensor and modulus
Between converter.
The signal conditioning circuit includes for the differential operational amplifier of low-pass filtering and for adopting vibrating sensor
The electric signal amplitude collected zooms to the gain controller in the analog-digital converter input range, the differential operational amplifier
It is connect respectively with vibrating sensor and gain controller, the gain controller is connect with analog-digital converter.
The vibration acquisition module further includes protection circuit, which is set to vibrating sensor and signal conditioning circuit
Between.
The protection circuit includes sequentially connected varistor and Schottky diode and Transient Suppression Diode.
The vibrating sensor is attached on transformer box wall, and is insulated with voltage device electric part.
The vibrating sensor is attached on transformer box wall by magnetic mode.
There are six the vibrating sensor is set altogether, wherein three are located at nearly high pressure side positions on transformer box wall, in addition three
It is a to be located at the top of transformer box wall.
The current-voltage sampling unit includes voltage transformer for acquiring transformer voltage and for acquiring electric current
Rogowski coil.
The main control module includes display and filter.
Compared with prior art, the invention has the following advantages:
1) collected vibration signal is converted into digital signal on the spot, is sent in control room by optical fiber, simultaneously also
It acquires voltage and current signal and auxiliary judgment is carried out to vibrational state, united using indoor main control module is controlled to signal
One processing, to judge whether transformer winding has occurred deformation in short-circuit test.
2) low-pass filtering part is devised, constructs low-pass filter circuit using Full differential operational amplifier, to being higher than
The signal of 1500HZ is filtered, and filters out the intrusion of external interference, guarantees that output signal whole frequency range is vibration information.
3) it directly will suitably be zoomed in or out by the collected electric signal amplitude of vibrating sensor, guaranteeing to sample
The details of vibration signal can be restored while precision.
4) nonlinear characteristic for utilizing varistor, voltage clamping is carried out when occurring overvoltage in route, to realize
Protection to late-class circuit, while Schottky diode and Transient Suppression Diode progress pressure stabilizing is added, prevent overvoltage to electricity
Road damages, while can be avoided the intrusion of outside noise interference, effectively absorption electric pulse, may cause between elimination route
Interference.
5) six road sampling channel of vibration acquisition module Gong She, respectively according to the vibration for specifying transformer box wall at design acquisition six
Dynamic signal, can restore basket vibration information, each sampling channel electrical isolation on hardware avoids adopting all the way because of certain to greatest extent
The sampled result in other channels is influenced when sample is abnormal.
6) Rogowski coil is selected, may be implemented to record the transient state details of current signal, and transient state details is utilized to have
There is good time domain specification, to meet the acquisition demand in short-circuit test to transformer current information.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of vibration acquisition module；
Fig. 3 is the realization circuit diagram of signal conditioning circuit；
Fig. 4 is the realization circuit diagram for protecting circuit；
Fig. 5 is that tank wall vibrates measuring point value arrangement map；
Fig. 6 is the realization circuit diagram of vibrating sensor part；
Fig. 7 is the realization circuit diagram of analog-digital converter；
Fig. 8 is the schematic diagram of main control module；
Wherein: 1, vibration acquisition module, 2, main control module, 3, optical fiber, 4, current-voltage sampling unit, 5, transformer, 11,
Vibrating sensor, 12, protection circuit, 13, signal conditioning circuit, 14, analog-digital converter, 21, display, 22, filter.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to
Following embodiments.
Transformer winding state vibration monitoring device in a kind of short-circuit test, as shown in Figure 1, including vibration interconnected
Acquisition module 1 and main control module 2, vibration acquisition module 1 include the vibrating sensor 11 connecting with transformer 5, as shown in Fig. 2,
Vibration acquisition module 1 further includes analog-digital converter 14, and the input terminal of analog-digital converter 14 is connected to vibrating sensor 11, output end
Be connected to main control module 2 by optical fiber 3, device further includes current-voltage sampling unit 4, the current-voltage sampling unit 4 it is defeated
Enter end and be connected to transformer 5, output end is connected to main control module 2.
The realization circuit diagram of analog-digital converter 14 is as shown in fig. 7, accuracy in order to guarantee vibration signal conversion, modulus turn
It changes circuit and has used 24 of AKM manufacturer model AK5393 type, 128 times of over-sampling rate double channel A/D C, sample rate reaches as high as
108kHZ realizes the dynamic process range of up to 117db using its enhanced double bit architecture.ADC can be selected according to actual needs
Different conversion rate and operating mode are taken, start and stop is controlled by processor chips, the digital signal converted is passed through into I2S
Communication protocol is sent.Since device needs while acquiring the mass data of multiplexer channel, processor has selected Xilinx public
The Spartan-6 type fpga chip of department is handled the data of multichannel using the advantage of FPGA parallel computation simultaneously.FPGA core
Piece has the advantages of low-power consumption, stable operation, is suitble to run for a long time in environment outdoors.The digital signal that system will convert
It is transmitted to main control module by HFBR-0508Z type fiber optic emitter, realizes the conversion on the spot and transmission of vibration signal.
Collected vibration signal is converted into digital signal on the spot, is sent in control room by optical fiber 3, while also adopting
Voltage and current signal are collected and auxiliary judgment are carried out to vibrational state, unification is carried out to signal using indoor main control module is controlled
Processing, to judge whether transformer winding has occurred deformation in short-circuit test.
As shown in figure 3, vibration acquisition module 1 further includes for low-pass filtering and by the collected telecommunications of vibrating sensor 11
Number amplitude zooms to the signal conditioning circuit 13 in 14 input range of analog-digital converter, which is set to vibration and passes
Between sensor 11 and analog-digital converter 14.Signal conditioning circuit 13 includes the differential operational amplifier for low-pass filtering and is used for
The collected electric signal amplitude of vibrating sensor 11 is zoomed into the gain controller in 14 input range of analog-digital converter, difference
Operational amplifier is connect with vibrating sensor 11 and gain controller respectively, and gain controller is connect with analog-digital converter 14.
Extraneous high-frequency interferencing signal may invade sensor and Acquisition Circuit, influence the data analysis in later period.Therefore
System devises low-pass filter circuit, constructs low-pass filter circuit using THS4551 Full differential operational amplifier, to being higher than
The signal of 1500HZ is filtered, and filters out the intrusion of external interference, guarantees that output signal whole frequency range is vibration information.By
In the limitation of rear class ADC input range, need directly suitably to be put by the collected electric signal amplitude of vibrating sensor
Big or diminution, can restore the details of vibration signal while guaranteeing sampling precision.System uses TS3A5017RSVR core
Piece constructs adjustable gain circuit module, and according to different vibration signal amplitudes, being provided with magnitude is 0.5,1,2,4 four kind of gain
Multiple, so that output signal can satisfy the processing requirement of late-class circuit.
As shown in figure 4, vibration acquisition module 1 further includes protection circuit 12, which is set to vibrating sensor 11
Between signal conditioning circuit 13.Protecting circuit 12 includes sequentially connected varistor R9 and Schottky diode D1 and transient state
Inhibit diode DB1.Vibration acquisition module 1 is installed in transformer short-circuit test bay, and test voltage and electric current significantly change
A large amount of interference can be generated, this proposes higher requirement to system rejection to disturbance performance.In order to be protected to vibration acquisition module 1
And the intrusion of external interference signal is isolated, protection circuit 12 is devised in circuit.It placed model after system access power supply
The varistor of GNR14D470K carries out voltage clamp when occurring overvoltage in route using the nonlinear characteristic of varistor
Position, to realize the protection to late-class circuit.Schottky diode is added and Transient Suppression Diode carries out pressure stabilizing, prevented electricity
Pressure damages circuit, while can be avoided the intrusion of outside noise interference, effectively absorption electric pulse, may between elimination route
Caused interference.
As shown in Figure 5 and Figure 6, vibrating sensor 11 is attached on transformer box wall, and is insulated with voltage device electric part.
Vibrating sensor 11 is attached on transformer box wall by magnetic mode.There are six vibrating sensor 11 is set altogether, wherein three positions
In high pressure side position close on transformer box wall, the other three is located at the top of transformer box wall.Based on simulation result and theory analysis
Consider, vibrating sensor has selected the AC102 type acceleration transducer of CTC company, and acquisition range is ± 50g, can monitor
Hz-KHz ranges up to 4000HZ, and acquisition sensitivity is 100mV/g, can effectively meet to vibration signal stable state and transient state feelings
Amplitude and accuracy requirement under condition.It is ferromagnetic substance at sensor connector, transformer box wall can be mounted directly on, do not need to increase
Additional measures are added to be fixed, with transformer without direct electrical connection.Six road sampling channel of vibration acquisition module Gong She, respectively
The vibration signal of transformer box wall at six is acquired, point position such as schemes to select, and can restore basket vibration information to greatest extent.Respectively
Sampling channel electrical isolation on hardware avoids the sampled result because influencing other channels when certain samples be abnormal all the way.
Furthermore since environment is more severe in test bay, the exposed vibrating sensor 11 in tank wall, which exists, occurs physical damage
Risk, system devises open and short detection module and is monitored to the working condition of sensor.When signal input amplitude is far high
When normal interval, judges that open circuit or short trouble occur for sensor, fed back to using operational amplifier output terminal
Processor is shown eventually by main control module and indicator light.
Current-voltage sampling unit 4 includes the voltage transformer for acquiring transformer voltage and sieve for acquiring electric current
Family name's coil.System needs the detailed information of record current and voltage to carry out auxiliary judgment to vibration signal.Transformation in short-circuit test
Device voltage change range is smaller, selects TR1176-220V/7.07V type voltage transformer, has linear change, precision height, sampling
The features such as range is wide.Decades of times when current amplitude can uprush to steady operation in test, while including certain low frequency component, very
To direct current signal is contained, so system selects Rogowski coil to record the transient state details of current signal.With traditional electric current
Sensor is compared, and Rogowski coil has the characteristics that measurement range is wide, precision is high, response band is wide, and it is right in short-circuit test to meet
The acquisition demand of transformer current information.
Main control module 2 includes display 21 and filter 22.The schematic diagram of main control module is as shown in figure 8, due to collecting
Vibration signal and current and voltage signals number of channels it is more, data volume is big, therefore main control module has used Spartan-
6XC6SLX45 chip carries out the reception of digital signal, is analyzed using FPGA by primary processor is sent to after Signal Pretreatment
Operation.Main control module uses OMAPL-138 type DSP+ARM dual core processor, is carried out using dsp chip to collected signal
Processing analysis, arm processor are responsible for the display of system information.Main control module has recording function, is provided with two different records
Wave mode can carry out recording, vibration and current-voltage information in record test when short-circuit test occurs.It can also be in short circuit
Timing recording when the normal condition of test front and back, the variation of longitudinal contrast shorts experiment front and back vibration information.Processor can carry out
Real-time Frequency Response Analysis judges vibration signal from time domain and frequency domain synthesis.System supports network communication and serial communication skill
Data can be exported to computer by network interface and be analyzed by art.In view of the extension demand in later period, main control module at most may be used
It supports the measurement of 24 road vibration signals, more transformers and multiple acquisition modules can be monitored simultaneously.It has reserved simultaneously each
Class extensive interface further monitors transformer with accessing other kinds of sensor information.
Claims (10)
1. transformer winding state vibration monitoring device in a kind of short-circuit test, including vibration acquisition module interconnected (1)
With main control module (2), the vibration acquisition module (1) includes the vibrating sensor (11) connecting with transformer (5), and feature exists
In the vibration acquisition module (1) further includes analog-digital converter (14), and the input terminal of the analog-digital converter (14) is connected to vibration
Dynamic sensor (11), output end are connected to main control module (2) by optical fiber (3), and described device further includes current-voltage sampling list
First (4), the input terminal of the current-voltage sampling unit (4) are connected to transformer (5), and output end is connected to main control module (2).
2. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 1, which is characterized in that
The vibration acquisition module (1) further includes scaling for low-pass filtering and by the collected electric signal amplitude of vibrating sensor (11)
Signal conditioning circuit (13) in the analog-digital converter (14) input range, the signal conditioning circuit (13) are set to vibration and pass
Between sensor (11) and analog-digital converter (14).
3. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 2, which is characterized in that
The signal conditioning circuit (13) includes for the differential operational amplifier of low-pass filtering and for adopting vibrating sensor (11)
The electric signal amplitude collected zooms to the gain controller in the analog-digital converter (14) input range, and the calculus of differences is put
Big device is connect with vibrating sensor (11) and gain controller respectively, and the gain controller is connect with analog-digital converter (14).
4. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 2, which is characterized in that
The vibration acquisition module (1) further includes protection circuit (12), which is set to vibrating sensor (11) and signal
Between conditioning circuit (13).
5. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 4, which is characterized in that
The protection circuit (12) includes sequentially connected varistor and Schottky diode and Transient Suppression Diode.
6. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 1, which is characterized in that
The vibrating sensor (11) is attached on transformer box wall, and insulate with voltage device electric part.
7. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 1, which is characterized in that
The vibrating sensor (11) is attached on transformer box wall by magnetic mode.
8. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 6, which is characterized in that
There are six the vibrating sensor (11) sets altogether, wherein three are located at nearly high pressure side position, the other three position on transformer box wall
At the top of transformer box wall.
9. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 1, which is characterized in that
The current-voltage sampling unit (4) includes the voltage transformer for acquiring transformer voltage and the Roche for acquiring electric current
Coil.
10. transformer winding state vibration monitoring device in a kind of short-circuit test according to claim 1, feature exist
In the main control module (2) includes display (21) and filter (22).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811639799.3A CN109612564A (en) | 2018-12-29 | 2018-12-29 | Transformer winding state vibration monitoring device in a kind of short-circuit test |
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| CN201811639799.3A CN109612564A (en) | 2018-12-29 | 2018-12-29 | Transformer winding state vibration monitoring device in a kind of short-circuit test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112213601A (en) * | 2020-09-29 | 2021-01-12 | 国网福建省电力有限公司电力科学研究院 | Experimental device for simulating double-coil radial induced electric power impact accumulated deformation |
| CN112986870A (en) * | 2021-01-26 | 2021-06-18 | 国网江苏省电力有限公司南京供电分公司 | Distributed power transformer winding state monitoring method and system based on vibration method |
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