CN109612565A - A kind of outdoor installs case cabinet of transformer winding state vibration monitoring - Google Patents
A kind of outdoor installs case cabinet of transformer winding state vibration monitoring Download PDFInfo
- Publication number
- CN109612565A CN109612565A CN201811640257.8A CN201811640257A CN109612565A CN 109612565 A CN109612565 A CN 109612565A CN 201811640257 A CN201811640257 A CN 201811640257A CN 109612565 A CN109612565 A CN 109612565A
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- Prior art keywords
- transformer
- installs case
- winding state
- cabinet
- vibration monitoring
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Classifications
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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
-
- 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
Abstract
The present invention relates to a kind of outdoor installs case cabinets of transformer winding state vibration monitoring, including cabinet body, cabinet door and vibration acquisition module, vibration acquisition module includes the vibrating sensor connecting with transformer and acquisition process unit, vibrating sensor is attached on transformer box wall, and it insulate with voltage device electric part, acquisition process unit is placed in cabinet body, acquisition process unit includes analog-digital converter, the input terminal of analog-digital converter is connected to the vibrating sensor outside cabinet body by cable, and output end is connected to main control module by optical fiber.Compared with prior art, present invention employs distributed designs, and acquisition process unit is arranged in cabinet body, waterproof may be implemented, expanded application range.
Description
Technical field
The present invention relates to a kind of installation bins, more particularly, to a kind of transformer winding state vibration monitoring outdoor installation
Bin.
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 measurement of transformer sudden short circuit can generally judge by the machine performance of detection winding, existing transformer
In fault detection method, relatively conventional has action of low-voltage pulse analytic approach, short-circuit impedance analytic approach, frequency response analysis etc., this
A little detection methods are based under the premise of winding has occurred that obvious fault, by electrical to the transformer before and after short circuit experiment
Test value detected to judge, need to be repeated several times and be tested, and cannot for some small winding deformation or distortion
Detection is enough effectively performed, it is also necessary to manually determine winding situation by hanging cover.But it is numerous to be tested number transformer, hangs
Cover process is complex, and many unconspicuous deformation need veteran operator that can screen, and is actually answering
There are the defects such as heavy workload, working efficiency be low in.
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 unit.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 a kind of transformer winding shapes
The outdoor installs case cabinet of state vibration monitoring.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of transformer winding state vibration monitoring outdoor installs case cabinet, including cabinet body, cabinet door and vibration acquisition module,
The vibration acquisition module includes the vibrating sensor connecting with transformer and acquisition process unit, and the vibrating sensor is sticked
It insulate on transformer box wall, and with voltage device electric part, the acquisition process unit is placed in cabinet body, the acquisition process
Unit includes analog-digital converter, and the input terminal of the analog-digital converter is connected to the vibrating sensing outside cabinet body by cable
Device, output end are connected to main control module by optical fiber.
Upper compartment, intermediate chamber and lower compartment are divided into the cabinet body, the acquisition process unit is located in upper compartment, and
It is separated between upper compartment and intermediate chamber by being electromagnetically shielded partition.
The bin further includes power supply, and the power supply is located in intermediate chamber, and the bottom of cabinet bulk is additionally provided with more
The power cable of a air plug, the optical fiber and power supply is respectively connected to each air plug.
Status indicator lamp is equipped on the inside of the cabinet door, which connects with acquisition process unit and power supply respectively
It connects.
It is additionally provided with Temperature Humidity Sensor in the intermediate chamber, which is connected to air plug.
The bin further includes current-voltage sampling unit, and the input terminal of the current-voltage sampling unit is connected to transformation
Device, output end are connected to main control module.
The acquisition process unit 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 acquisition process unit further includes protection circuit, which is set to vibrating sensor and signal conditioning circuit
Between, which includes sequentially connected varistor and Schottky diode and Transient Suppression Diode.
The vibrating sensor is attached on transformer box wall by magnetic mode.
The current-voltage sampling unit includes voltage transformer for acquiring transformer voltage and for acquiring electric current
Rogowski coil.
Compared with prior art, the invention has the following advantages:
1) distributed design is used, acquisition process unit is arranged in cabinet body, waterproof may be implemented, expanded and answered
Use range.
2) it is separated between upper compartment and intermediate chamber by being electromagnetically shielded partition, and acquisition process unit is located at upper compartment,
Power supply is located in intermediate chamber, reduces electromagnetic interference, improves the accuracy of monitoring data.
3) 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.
4) 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.
5) 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.
6) 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.
7) 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 schematic diagram of present invention monitoring part;
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;
Fig. 9 is structural schematic diagram of the invention;
Wherein: 1, vibration acquisition module, 2, main control module, 3, optical fiber, 4, current-voltage sampling unit, 5, transformer, 6,
Cabinet body, 7, cabinet door, 8, power supply, 11, vibrating sensor, 12, protection circuit, 13, signal conditioning circuit, 14, analog-to-digital conversion
Device, 21, display, 22, filter, 61, upper compartment, 62, intermediate chamber, 63, lower compartment, 71, status indicator lamp.
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.
A kind of outdoor installs case cabinet of transformer winding state vibration monitoring, as shown in Fig. 8 and Fig. 1, including cabinet body 6, cabinet
Door 7 and vibration acquisition module 1, vibration acquisition module 1 include the vibrating sensor 11 and acquisition process list connecting with transformer 5
Member, vibrating sensor 11 are attached on transformer box wall, and are insulated with voltage device electric part, and acquisition process unit is placed in cabinet body
In 6, acquisition process unit includes analog-digital converter 14, and the input terminal of analog-digital converter 14 is connected to by cable positioned at cabinet body 6
Outer vibrating sensor 11, output end are connected to main control module 2 by optical fiber 3.
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.
Upper compartment 61, intermediate chamber 62 and lower compartment 63 are divided into cabinet body 6, acquisition process unit is located in upper compartment 61,
And it is separated between upper compartment 61 and intermediate chamber 62 by being electromagnetically shielded partition.
Bin further includes power supply 8, and power supply 8 is located in intermediate chamber 62, and 6 bottom of cabinet body is additionally provided with multiple air plugs,
The power cable of optical fiber 3 and power supply 8 is respectively connected to each air plug.
On the inside of cabinet door 7 be equipped with status indicator lamp 71, the status indicator lamp 71 respectively with acquisition process unit and power supply 8
Connection.
Temperature Humidity Sensor 64 is additionally provided in intermediate chamber 62, which is connected to air plug.
Bin further includes current-voltage sampling unit 4, and the input terminal of the current-voltage sampling unit 4 is connected to transformer 5,
Output end is connected to main control module 2.
Acquisition process unit further includes scaling for low-pass filtering and by the collected electric signal amplitude of vibrating sensor 11
Signal conditioning circuit 13 to 14 input range of analog-digital converter, the signal conditioning circuit 13 are set to vibrating sensor 11 and mould
Between number converter 14.As shown in figure 3, 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.
Acquisition process unit further includes protection circuit 12, which is set to vibrating sensor 11 and signal condition electricity
Between road 13, which includes sequentially connected varistor R9 and Schottky diode D1 and Transient Suppression Diode
DB1.As shown in figure 4, vibration acquisition module 1 is installed in transformer short-circuit test bay, test voltage and electric current are significantlyd 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-6
XC6SLX45 chip carries out the reception of digital signal, carries out analysis fortune for primary processor is sent to after Signal Pretreatment using FPGA
It calculates.Main control module use OMAPL-138 type DSP+ARM dual core processor, using dsp chip to collected signal at
Reason analysis, arm processor are responsible for the display of system information.Main control module has recording function, is provided with two different recordings
Mode can carry out recording, vibration and current-voltage information in record test when short-circuit test occurs.It can also be tried in short circuit
Timing recording when testing front and back normal condition, the variation of longitudinal contrast shorts experiment front and back vibration information.Processor can carry out reality
When Frequency Response Analysis, vibration signal is judged from time domain and frequency domain synthesis.System supports network communication and Serial Communication,
Data can be exported to computer by network interface and be analyzed.In view of the extension demand in later period, main control module can at most be propped up
The measurement of 24 road vibration signals is held, more transformers and multiple acquisition modules can be monitored simultaneously.It has reserved simultaneously all kinds of
Extensive interface further monitors transformer with accessing other kinds of sensor information.
Claims (10)
1. a kind of transformer winding state vibration monitoring outdoor installs case cabinet, including cabinet body (6), cabinet door (7) and vibration acquisition
Module (1), the vibration acquisition module (1) include the vibrating sensor (11) and acquisition process unit connecting with transformer (5),
It is characterized in that, the vibrating sensor (11) is attached on transformer box wall, and insulate with voltage device electric part, it is described to adopt
Collection processing unit is placed in cabinet body (6), and the acquisition process unit includes analog-digital converter (14), the analog-digital converter (14)
Input terminal the vibrating sensor (11) positioned at cabinet body (6) outside is connected to by cable, output end is connected to master by optical fiber (3)
It controls module (2).
2. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 1, which is characterized in that
Be divided into upper compartment (61), intermediate chamber (62) and lower compartment (63) in the cabinet body (6), the acquisition process unit on every
Between in (61), and separated between upper compartment (61) and intermediate chamber (62) by being electromagnetically shielded partition.
3. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 2, which is characterized in that
The bin further includes power supply (8), and the power supply (8) is located in intermediate chamber (62), and cabinet body (6) bottom is also set
There are multiple air plugs, the power cable of the optical fiber (3) and power supply (8) is respectively connected to each air plug.
4. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 3, which is characterized in that
Status indicator lamp (71) are equipped on the inside of the cabinet door (7), the status indicator lamp (71) is electric with acquisition process unit and power supply respectively
Source (8) connection.
5. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 3, which is characterized in that
Temperature Humidity Sensor (64) are additionally provided in the intermediate chamber (62), which is connected to air plug.
6. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 1, which is characterized in that
The bin further includes current-voltage sampling unit (4), and the input terminal of the current-voltage sampling unit (4) is connected to transformer
(5), output end is connected to main control module (2).
7. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 1, which is characterized in that
The acquisition process unit further includes for low-pass filtering and zooming to the collected electric signal amplitude of vibrating sensor (11)
Signal conditioning circuit (13) in analog-digital converter (14) input range, the signal conditioning circuit (13) are set to vibrating sensing
Between device (11) and analog-digital converter (14).
8. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 1, which is characterized in that
The acquisition process unit further includes protection circuit (12), which is set to vibrating sensor (11) and signal condition
Between circuit (13), which includes that sequentially connected varistor and Schottky diode and transient state inhibit two poles
Pipe.
9. a kind of outdoor installs case cabinet of transformer winding state vibration monitoring according to claim 1, which is characterized in that
The vibrating sensor (11) is attached on transformer box wall by magnetic mode.
10. a kind of transformer winding state vibration monitoring according to claim 6 is existed with outdoor installs case cabinet, feature
In, the current-voltage sampling unit (4) include voltage transformer for acquiring transformer voltage and for acquiring electric current
Rogowski coil.
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Citations (6)
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CN201654083U (en) * | 2010-05-06 | 2010-11-24 | 中国人民解放军92601部队 | Shielding box for weak-voltage detector |
KR20160131517A (en) * | 2015-05-07 | 2016-11-16 | 한국 전기안전공사 | Transformer winding diagnosis apparatus and method |
CN104237705B (en) * | 2014-09-30 | 2017-01-25 | 沈阳工业大学 | Diagnostic method of multi-information fusion online monitoring device for windings of power transformers |
CN106443316A (en) * | 2016-10-12 | 2017-02-22 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding deformation state multi-information detection method and device |
CN207820408U (en) * | 2018-01-19 | 2018-09-04 | 四川荷斐斯通用设备制造有限公司 | PLC rack body with electro-magnetic screen function |
CN108802553A (en) * | 2018-06-12 | 2018-11-13 | 广州供电局有限公司 | A kind of transformer winding fault state system of condition monitoring |
-
2018
- 2018-12-29 CN CN201811640257.8A patent/CN109612565A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201654083U (en) * | 2010-05-06 | 2010-11-24 | 中国人民解放军92601部队 | Shielding box for weak-voltage detector |
CN104237705B (en) * | 2014-09-30 | 2017-01-25 | 沈阳工业大学 | Diagnostic method of multi-information fusion online monitoring device for windings of power transformers |
KR20160131517A (en) * | 2015-05-07 | 2016-11-16 | 한국 전기안전공사 | Transformer winding diagnosis apparatus and method |
CN106443316A (en) * | 2016-10-12 | 2017-02-22 | 国网辽宁省电力有限公司电力科学研究院 | Power transformer winding deformation state multi-information detection method and device |
CN207820408U (en) * | 2018-01-19 | 2018-09-04 | 四川荷斐斯通用设备制造有限公司 | PLC rack body with electro-magnetic screen function |
CN108802553A (en) * | 2018-06-12 | 2018-11-13 | 广州供电局有限公司 | A kind of transformer winding fault state system of condition monitoring |
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Application publication date: 20190412 |