CN106404078B - A kind of transformer online monitoring device - Google Patents
A kind of transformer online monitoring device Download PDFInfo
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- CN106404078B CN106404078B CN201611063290.XA CN201611063290A CN106404078B CN 106404078 B CN106404078 B CN 106404078B CN 201611063290 A CN201611063290 A CN 201611063290A CN 106404078 B CN106404078 B CN 106404078B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
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Abstract
The invention discloses a kind of transformer online monitoring devices, for the running environment and state progress real-time monitoring to transformer body.The monitoring device includes oil chromatography on-line analysis device, bushing shell for transformer on-Line Monitor Device, temperature sensor, transformer vibrating sensor, partial discharge of transformer ultrasound detection sensor and host computer；Host computer is connect with the oil chromatography on-line analysis device, bushing shell for transformer on-Line Monitor Device, temperature sensor, transformer vibrating sensor and partial discharge of transformer ultrasound detection sensor respectively by conductor wire.On-Line Monitor Device in the present invention, based on multi-sensor collection various parameters relevant to transformer station high-voltage side bus environment and state, real-time monitoring and assessment are carried out with the state to transformer station high-voltage side bus, is adapted to the transformer of different voltages grade, has many advantages, such as that data transmission bauds is accurate, interference is small.
Description
Technical field
The invention belongs to transformer technology fields, and in particular to a kind of transformer online monitoring device.
Background technique
Transformer carries the task of voltage transformation, electric energy distribution and transfer, the normal fortune of transformer in the power system
Row is power system security, reliably economical operation and the important guarantee for electricity consumption.Transformer is easy to appear in longtime running
Failure and accident.It is various due to causing transformer fault and accident, correct diagnosis is carried out to failure and is predicted early, just
With more urgent practicability and importance.Currently, commonplace fault diagnosis mode are as follows: sentenced by oil chromatography monitoring device
Break and occurred fault degree and partial fault type, but the specific location of power transformer interior fault is not easy to measure, especially
It judges more difficult identification for transformer inner discharge position.It can be seen that the prior art requires further improvement.
Summary of the invention
For the above-mentioned technical problems in the prior art, the invention proposes a kind of transformer online monitoring device,
Comprehensive assessment analysis is carried out for the operating status to transformer, while is carried out by comprehensive assessment and is examined for transformer insulated situation
It is disconnected.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of transformer online monitoring device, for transformer body running environment and state carry out real-time monitoring,
The monitoring device includes:
Oil chromatography on-line analysis device is connected by oil pipeline with transformer body；
The bushing shell for transformer bottom on transformer body is arranged in bushing shell for transformer on-Line Monitor Device；
Temperature sensor is arranged on the surface of transformer body, the wrapped outside of the winding insulation inside transformer body
And in the fuel tank inside transformer body；
Transformer vibrating sensor and partial discharge of transformer ultrasound detection sensor, are arranged in the surface of transformer body
On；
And host computer, it is monitored on-line respectively with the oil chromatography on-line analysis device, bushing shell for transformer by conductor wire
Device, temperature sensor, transformer vibrating sensor are connected with partial discharge of transformer ultrasound detection sensor.
Preferably, it is equipped with oil outlet in transformer body bottom, is equipped with switch in oil outlet；Oil outlet is online with oil chromatography
The oil inlet end of analytical equipment is connected by oil pipeline.
Preferably, it to be arranged in parallel between the oil chromatography on-line analysis device and transformer body, and deposits therebetween
Thermal insulation layer is enclosed on gap, oil pipeline.
Preferably, there are three the bushings shell for transformer, a transformer is respectively set in the bottom of each bushing shell for transformer
Casing on-Line Monitor Device.
Preferably, part temperature sensor is arranged in each sidewall surfaces of transformer body, and each sidewall surfaces
On at least five temperature sensors.
Preferably, the wrapped outside of winding insulation inside transformer body is equipped with a temperature sensor, transformer sheet
Temperature sensor there are two being set in the fuel tank in internal portion.
Preferably, each sidewall surfaces of transformer body are arranged in the partial discharge of transformer ultrasound detection sensor
On, and each sidewall surfaces at least one partial discharge of transformer ultrasound detection sensors.
Preferably, the transformer vibrating sensor is arranged in each sidewall surfaces of transformer body, and each side
At least one transformer vibrating sensor on wall surface.
Preferably, the monitoring device further includes display screen and alarm, host computer by conductor wire respectively with display screen
It is connected with alarm.
Preferably, the monitoring device further includes carrying out ether with user, data processing and transceiver module or web server
The communication control unit of fiber optic network communication
The present invention has the advantage that
The present invention is based on multisensor (such as oil chromatography on-line analysis devices, bushing shell for transformer on-Line Monitor Device, temperature
Sensor, transformer vibrating sensor and partial discharge of transformer ultrasound detection sensor) acquisition with transformer station high-voltage side bus environment and
The relevant various parameters of state carry out real-time monitoring and assessment with the state to transformer station high-voltage side bus, are adapted to different voltages grade
Transformer, have many advantages, such as that data transmission bauds is accurate, interference is small.In addition, above-mentioned each transducer sensitivity is high, host computer pair
The data analysing method science of each sensor acquisition is practical, can accurately reflect the operating status of transformer, failure is studied and judged accurately
Property it is high.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of transformer online monitoring device in the present invention；
Fig. 2 is a kind of work flow diagram of transformer online monitoring device in the present invention；
Wherein, 1- transformer body, 2- oil chromatography on-line analysis device, 3- bushing shell for transformer on-Line Monitor Device, 4- temperature
Spend sensor, 5- transformer vibrating sensor, 6- host computer, 7- oil pipeline, 8- bushing shell for transformer, 9- conductor wire；
10- oil outlet, 11- switch, 12- partial discharge of transformer ultrasound detection sensor, 13- display screen, 14- alarm
Device, 15- user, 16- data processing and transceiver module, 17-web server.
Specific embodiment
With reference to the accompanying drawing and specific embodiment invention is further described in detail:
As shown in connection with fig. 1, a kind of transformer online monitoring device, for the running environment and state to transformer body 1
Carry out real-time monitoring.Above-mentioned monitoring device includes:
Oil chromatography on-line analysis device 2 is connected by oil pipeline 7 with transformer body 1；
8 bottom of bushing shell for transformer on transformer body 1 is arranged in bushing shell for transformer on-Line Monitor Device 3；
Temperature sensor 4 is arranged on the surface of transformer body 1, the winding insulation inside transformer body 1 is wrapped outer
In fuel tank inside side and transformer body 1；
Transformer vibrating sensor 5 is arranged on the surface of transformer body 1；
Partial discharge of transformer ultrasound detection sensor 12, is arranged on the surface of transformer body 1；And
Host computer 6, by conductor wire 9 respectively with oil chromatography on-line analysis device 2, bushing shell for transformer on-Line Monitor Device 3,
Temperature sensor 4, transformer vibrating sensor 5 and partial discharge of transformer ultrasound detection sensor 12 connect.
Based on above-mentioned multisensor, various parameters relevant to transformer station high-voltage side bus environment and state can be acquired, to change
The state of depressor operation carries out real-time monitoring and assessment, is adapted to the transformer of different voltages grade.
Specifically, being equipped with oil outlet 10 in 1 bottom of transformer body, switch 11 is equipped in oil outlet 10.Oil outlet 10 with
It is connected between the oil inlet end of oil chromatography on-line analysis device 2 by oil pipeline 7.
Preferably, to be arranged in parallel between oil chromatography on-line analysis device 2 and transformer body 1, and exist therebetween
Gap is enclosed with thermal insulation layer on oil pipeline 7.
Above-mentioned design is effectively prevent being overheated due to oil pipeline 7, influences the normal work of oil chromatography on-line analysis device 2.
Above-mentioned thermal insulation layer, such as can be using heat-insulated/heat-preservation cotton etc., naturally it is also possible to using ground as thermal insulation layer, i.e., will
Oil pipeline 7 is embedded in ground to reach heat insulation.
In practical applications, oil chromatography on-line analysis device 2 for example can be using the N-TCG-6C of TMT&D company production
Type transformer chromatogram monitoring device, N-TCG-6C type transformer chromatogram monitoring device are by mounted in transformer sheet
One vacuum pump of 1 bottom of body, transformer oil is extracted out, flows into chromatographic analysis device, and chromatographic analysis device is by the gas in oil
The detection for carrying out respective component is separated, meanwhile, transformer oil is back to transformer body 1.
Correspondingly, it is additionally provided with oil return opening on 1 top of transformer body, meanwhile, in the fuel-displaced of oil chromatography on-line analysis device 2
Increase an oil pipeline 7 between mouth end and oil return opening.
The top of transformer body 1 is arranged in bushing shell for transformer 8, and there are three bushings shell for transformer 8, in each bushing shell for transformer
A bushing shell for transformer on-Line Monitor Device 2 is respectively set in 8 bottom.
In practical applications, bushing shell for transformer on-Line Monitor Device 2 can for example be supervised online using W-PD2 bushing shell for transformer
Device is surveyed, W-PD2 is the self-contained unit using microprocessor, is exclusively used in the output letter of bushing shell for transformer in monitoring power frequency system
Number, and store it in device internal storage, alarm signal can be issued according to the Gamma parameter characteristic of insulation ag(e)ing early stage
Number.
Part temperature sensor 4 is arranged in each sidewall surfaces of transformer body 1, and in each sidewall surfaces at least
There are five temperature sensors, can also be six, seven, eight etc..
When five temperature sensors 4 are arranged in each sidewall surfaces, side wall table where each temperature sensor 4 is located at
The center in face and four vertex positions, as shown in Figure 1.
Certainly, the wrapped outside of winding insulation inside transformer body 1 is additionally provided with a temperature sensor 4, for examining
Survey the inside winding temperature of transformer body 1.
Temperature sensor 4 there are two being set in the fuel tank inside transformer body 1, for detecting temperature of oil in transformer.
For the measuring probe of temperature sensor 4 in the present invention using that can select platinum resistance thermometer sensor, measurement method is platinum thermoelectricity
Three-wire system measurement method is hindered, temperature of oil in transformer protection and monitoring are by platinum resistance thermometer sensor, and digital temperature display adjusting apparatus joint group
At.
Digital temperature display regulator should export all the way 4-20mA analog quantity to host computer 6.
6 data processing of host computer forms application system using TMS320F28335.It has 32 float-point DSP processors,
Handle the data of each monitoring device sensor acquisition of transformer.
Transformer vibrating sensor 5 is arranged in each sidewall surfaces of transformer body 1, and each sidewall surfaces up to
A rare transformer vibrating sensor 5, such as can be one, two or three etc..
When three transformer vibrating sensors 5 are arranged in each sidewall surfaces, the peace of each transformer vibrating sensor 5
Holding position are as follows: be arranged two in transformer body sidewall surfaces lower part, setting one in the middle part of transformer body sidewall surfaces.
By the way that transformer vibrating sensor 5 is respectively set in each sidewall surfaces, transformer body 1 can be sensed in time
The vibration on surface, so that accuracy of judgement judges the position in oscillation point in time.
Each sidewall surfaces of transformer, and each side wall table is arranged in partial discharge of transformer ultrasound detection sensor 12
Face at least three, such as can also be 4,5 etc..
When, there are three when partial discharge of transformer ultrasound detection sensor 12, each transformer is locally put in each sidewall surfaces
The upper, middle and lower of transformer side wall surface central axes where the position of electric ultrasound detection sensor 12 is selected in, using type
Number be HT-BEF1501, sampling bandwidth be 30kHz-400kHz, centre frequency for 150kHz ultrasonic sensor.
Pass through oil chromatography on-line analysis device 2, bushing shell for transformer on-Line Monitor Device 3, temperature sensor 4, transformer vibration
The specific arrangement method of dynamic sensor 5 and partial discharge of transformer ultrasound detection sensor 12, allows the present invention multi-faceted
The abnormal conditions of transformer body 1 are monitored from every side, so that rapid feedback is to host computer 6.
In addition, the monitoring device in the present invention further includes display screen 13 and alarm 14, host computer 6 is divided by conductor wire 9
It is not connect with display screen 13 and alarm 14.Display screen 13 is used to show relevant parameter.
Preferably, monitoring device further include carried out with user 15, data processing and transceiver module 16 or web server 17 with
The too communication control unit of fiber optic network communication.Host computer 6 and the side of transformer body 1 are connected through a screw thread, structure is simple,
It is easy to repair arrange, manufacturing cost it is low, and intelligence degree is high.
Data processing and transceiver module 16 in the present invention is such as can be using MODBus data processor.
In addition, the present invention gives the monitoring method based on above-mentioned transformer online monitoring device, substantially process is as follows:
Transformer body 1 is mounted on suitable ground first, dismountable oil colours is installed in the side of transformer body 1
On-line analysis device 2 is composed, the bushing shell for transformer on-Line Monitor Device 3 inside bushing shell for transformer 8 works in bushing shell for transformer 8
Relevant parameter is transferred to host computer 6 in the case where exception；The temperature sensor 4 on 1 surface of transformer body, transformer vibration pass
Sensor 5 combines itself working condition of the 2 entire power transformer of real time reaction of oil chromatography on-line analysis device, ambient parameters
It is transferred to host computer 6；The partial discharge of transformer ultrasound detection sensor 12 of each side wall of transformer body 1 is according to detecting
The frequency and amplitude of the ultrasonic signal of local discharge signal inside transformer body, and associated arguments are transferred to host computer 6,
By analyzing the difference of same sidewall surfaces ultrasonic signal attenuation degree, compares and calculate partial discharge position distance originally
The Position Approximate of side wall determines shelf depreciation regional scope by positive and negative two side walls, passes through the integrated data of four side walls
To determine shelf depreciation in the approximate location of transformer body 1；And host computer 6 and 1 normal operating parameters of transformer body carry out
Comparison, carries out work alarm, is either remotely monitored or coordinates by ether fiber optic network, and comprehensive oil chromatography parameter,
Iron core grounding electric current, oil temperature oil pressure parameter and customary off-line testing data integrate 1 integral insulation situation of transformer body
Assessment and diagnosis, accurately identify partial discharge position, comprehensively carry out analysis and assessment to the use state of transformer.
The present invention is when determining power transformer interior fault mainly in combination with temperature sensor 4 and oil chromatography on-line analysis device
The judgement of 2 aggregation of data, specific decision process are as follows:
1. the characteristic gas ingredient ratio Q coding that oil chromatography on-line analysis device 2 measures is arranged, as shown in table 1 below；
Table 1
2. recording the temperature value T that inside transformer winding temperature sensor 4 records；
3. the comprehensive failure that carries out is studied and judged, as shown in table 2 below:
Table 2
The decision process of several common faults is given below with reference to above-mentioned decision procedure:
The positioning of 3.1 partial discharge of transformer positions:
Transformer online monitoring device has installed altogether 12 partial discharge of transformer ultrasound detections in the embodiment of the present invention
Sensor 12, when measurement, are established the rectangular coordinate system of a transformer using one jiao of transformer as coordinate origin (0,0,0), this are filled
The coordinate position of 12 partial discharge of transformer ultrasound detection sensors in setting separates into four of upper layer respectively With four of middle layerWith four of lower layerTotally three
Group, and shelf depreciation point is set to P (x, y, z), spread speed is v to ultrasonic wave in the oil, and the time to each point is t1,
t2... ... t12。
Every group in this way could set up a location at spherical surface equation are as follows:
fi(x, y, z, v)=(x-xi)2+(y-yi)2+(z-zi)2-vti 2=0；
Wherein, i=1,2,3 ... 12；Three layers are separated to calculate in data processing module, every layer of four transformers
The spherical surface crosspoint that shelf depreciation ultrasound detection sensor 12 measures can all determine a partial discharge position point P1,P2,P3。
Because ultrasonic wave propagation path is complex, the transmission speed on each path is not quite similar, therefore each layer of determination
Partial discharge position and inaccurate, therefore a disc is determined by three layers of three partial discharge position point measured, with circle
Heart P0It can determine that a sphere, the sphere are located at transformer inner discharge position range for the centre of sphere.
Such failure carries out macroscopical failure mode analysis first with chromatography, then passes through partial discharge of transformer ultrasound
12 array of detection sensor carries out shelf depreciation specific location and studies and judges.
3.2 deformation of transformer winding fault verification:
There are three transformer vibrating sensor 5, transformer vibrating sensors 5 in each sidewall surfaces in the embodiment of the present invention
Measured vibration signal is S (t), obtains the ENERGY E of each frequency component by Fast Fourier Transform (FFT)f, calculating formula are as follows:
Often take 50Hz, 100Hz, 150Hz when judgement, its energy value of the component of 200Hz frequency is judged, is examined
Disconnected model is as follows:
Wherein, ET50, ET100, ET150, ET20050Hz, the 100Hz that the vibrating sensor of respectively transformer bottom measures,
The energy of 150Hz, 200Hz frequency component, EF100The 100Hz frequency component energy measured for transformer side Middle face vibrating sensor
Amount, C1, C2, C3Criterion value respectively in model；Enable feature vector T=[C1 C2 C3]。
The feature vector measured when normal is TN, the feature vector that when a certain operation measures is TX, Δ T=TX-TN=[Δ C1
ΔC2 ΔC3], as Δ C1, Δ C2, Δ C3When being all larger than zero, then determine that winding deformation failure occurs in inside transformer.
3.3 bushing shell for transformer dielectric losses on-line monitoring:
By the bushing shell for transformer on-Line Monitor Device 3 being arranged in bushing shell for transformer bottom, the electric current for flowing through casing is measured
With added voltage, it is calculated by the following formula out dielectric dissipation factor tan δ.
Wherein: u (t), i (t) are the time-domain signal that sensor measures, and are carried out Fourier decomposition, U0, I0For voltage, electricity
The DC component of stream, UkAnd IkThe respectively voltage of kth subharmonic, current component,The respectively electricity of kth subharmonic
The initial phase of stream, voltage, and dielectric loss tan δ is exactly to be got by calculating the fundamental wave initial phase of voltage and current.
Observe the dielectric loss tan δ of bushing shell for transformer, dielectric loss when normal in real time by portable data processing module
For tan δ0As Δ tan δ/tan δ0When > 0.5, illustrate occur dampness, the defect of shelf depreciation inside bushing shell for transformer.
The thought that transformer fault in the present invention is studied and judged is the fault type point that macroscopic view is first carried out according to a kind of sensor
Then analysis is equipped with aiding sensors and be accurately positioned either fault type and reaffirms have breakdown judge accuracy rate high,
Most failures that abort situation judges accurate feature and can occur comprising transformer.
Host computer 6 in the present invention be it is a kind of can be set conventional sense parameter and can with monitoring abnormal conditions under
The display screen 13 that 1 parameter of transformer body is compared and timely responded to reflects the fault type of transformer body 1, reminds
Staff takes corresponding measure to ensure transformer safety operation.
The fault diagnosis and warning function of host computer 6 are the chief component and monitoring device of entire monitoring device
The key that function is achieved, so the reasonability and accuracy of part design are most important.
Insulation tube arrester and warning function use the information fusion technology based on many reference amounts, realize to various information most
Good fusion.Specific implementation process: extracting effective characteristic quantity from monitoring information first, and characteristic quantity is then inputted training in advance
Neural network, in Mishap Database failure compare, obtain fault type.
In last sensing data processing, the present invention carries out data processing by the way of multi-sensor information fitting
It is studied and judged with failure.Such as detect one parameter P of setting in transformer oil chromatographic and represent transformer fault coefficient, when P is more than setting
The correct operational parameter value of transformer after, numerical value is higher, and reflection power transformer interior fault is more serious, at this time a certain characteristic gas
(such as H2) detection sensor can export the voltage value U for representing the gas content1, after carrying out calibration experiment, can obtain defeated
Enter curve of output, but such case will appear large error.Because being measured the function of a single variable for being not necessarily output valve.But therefore
The variation of barrier parameter P is not all because caused by the variation ability of pure gas content, it is assumed that another feature gas (such as CO) detection
Sensor exports the voltage value U for representing the gas content2, then transformer fault parameter can be expressed as U1And U2Collective effect
Binary function P=F (U1,U2).It is possible thereby to which the method using surface fitting obtains fit equation: P=α0+α1U1+α2U2+α3U1 2+α4U1U2+α5U2+ε1, wherein α0~α5It is constant coefficient, size can make its satisfaction square according to the principle of least square
Poor minimum acquires.ε1For higher-order shear deformation.Wherein, constant coefficient can be found out by calibration, it is hereby achieved that P=F (U1,U2)
Functional relation.Device in the Characteristic Extraction of low speed sampled signal at the scene controller to completing: for of ac,
Using the virtual value of each power frequency period as characteristic quantity；For direct current monitoring quantity, take the average value of each collection period as special
Sign amount.
Certainly, described above is only that presently preferred embodiments of the present invention is answered the present invention is not limited to enumerate above-described embodiment
When explanation, anyone skilled in the art is all equivalent substitutes for being made, bright under the introduction of this specification
Aobvious variant, all falls within the essential scope of this specification, ought to be by protection of the invention.
Claims (3)
1. a kind of transformer online monitoring device, for transformer body running environment and state carry out real-time monitoring,
It is characterized in that, the monitoring device includes:
Oil chromatography on-line analysis device is connected by oil pipeline with transformer body；
The bushing shell for transformer bottom on transformer body is arranged in bushing shell for transformer on-Line Monitor Device；
Temperature sensor, be arranged on the surface of transformer body, the wrapped outside of the winding insulation inside transformer body and
In fuel tank inside transformer body；
Transformer vibrating sensor and partial discharge of transformer ultrasound detection sensor, are arranged on the surface of transformer body；
And host computer, by conductor wire respectively with the oil chromatography on-line analysis device, bushing shell for transformer on-Line Monitor Device,
Temperature sensor, transformer vibrating sensor are connected with partial discharge of transformer ultrasound detection sensor；
It is equipped with oil outlet in transformer body bottom, is equipped with switch in oil outlet；Oil outlet and oil chromatography on-line analysis device
Oil inlet end is connected by oil pipeline；
To be arranged in parallel between the oil chromatography on-line analysis device and transformer body, and there is gap therebetween, oil transportation
Thermal insulation layer is enclosed on pipeline；
There are three bushings shell for transformer, and a bushing shell for transformer on-line monitoring dress is respectively set in the bottom of each bushing shell for transformer
It sets；
Part temperature sensor is arranged in each sidewall surfaces of transformer body, and at least five in each sidewall surfaces
Temperature sensor；
The wrapped outside of winding insulation inside transformer body is equipped with a temperature sensor, the fuel tank inside transformer body
Temperature sensor there are two inside setting；
The partial discharge of transformer ultrasound detection sensor is arranged in each sidewall surfaces of transformer body, and each side
There are three partial discharge of transformer ultrasound detection sensors for wall surface；
The transformer vibrating sensor is arranged in each sidewall surfaces of transformer body, and has three in each sidewall surfaces
A transformer vibrating sensor；
Wherein, as follows using above-mentioned transformer online monitoring device progress partial discharge of transformer location positioning procedure:
A total of 12 of the quantity of partial discharge of transformer ultrasound detection sensor in each sidewall surfaces of transformer body；
The rectangular coordinate system for establishing a transformer when measurement using one jiao of transformer as coordinate origin (0,0,0), by 12 transformations
The coordinate position of device shelf depreciation ultrasound detection sensor separates into respectively:
Four of upper layer
Four of middle layerAnd
Four of lower layerTotally three
Group；
And shelf depreciation point is set to P (x, y, z), spread speed is v to ultrasonic wave in the oil, and the time to each point is t1,
t2... ..t12；
Every group in this way could set up a location at spherical surface equation are as follows:
fi(x, y, z, v)=(x-xi)2+(y-yi)2+(z-zi)2-vti 2=0；
Wherein, i=1,2,3 ... 12；
Three layers are separated to calculate, the spherical surface crosspoint that every layer of four partial discharge of transformer ultrasound detection sensors measure is all
It can determine whether a partial discharge position point P1, P2, P3；
The three partial discharge position points measured by three layers determine a disc, with center of circle P0A sphere is determined for the centre of sphere, it should
Sphere is located at transformer inner discharge position range；
Such failure carries out macroscopical failure mode analysis first with chromatography, then passes through partial discharge of transformer ultrasound detection
Sensor array carries out shelf depreciation specific location and studies and judges；
Wherein, the process for carrying out deformation of transformer winding fault verification using above-mentioned transformer online monitoring device is as follows:
Vibration signal measured by transformer vibrating sensor is S (t), obtains each frequency component by Fast Fourier Transform (FFT)
ENERGY Ef, calculating formula are as follows:
Take 50Hz, 100Hz, 150Hz when judgement, its energy value of the component of 200Hz frequency is judged；
Its diagnostic model is as follows:
Wherein, ET50, ET100, ET150, ET20050Hz, 100Hz, the 150Hz that the vibrating sensor of respectively transformer bottom measures,
The energy of 200Hz frequency component；
EF100The 100Hz frequency component energy measured for transformer side Middle face vibrating sensor；
C1, C2, C3Criterion value respectively in model；Enable feature vector T=[C1 C2 C3]；
The feature vector measured when normal is TN, and the feature vector that when a certain operation measures is Tx, Δ T=TX-TN=[Δ C1 △
C2 ΔC3], as △ C1, △ C2, Δ C3When being all larger than zero, then determine that winding deformation failure occurs in inside transformer；
Wherein, the process for carrying out bushing shell for transformer dielectric loss on-line monitoring using above-mentioned transformer online monitoring device is as follows:
By the bushing shell for transformer on-Line Monitor Device being arranged in bushing shell for transformer bottom, the electric current for flowing through bushing shell for transformer is measured
With added voltage, it is calculated by the following formula out dielectric dissipation factor tan δ；
Wherein: u (t), i (t) are the time-domain signal that sensor measures, and are carried out Fourier decomposition；
U0, I0For the DC component of voltage, electric current, UkAnd IkThe respectively voltage of kth subharmonic, current component；
The respectively initial phase of the electric current of kth subharmonic, voltage；
And dielectric loss tan δ is exactly to be got by calculating the fundamental wave initial phase of voltage and current；
The dielectric loss tan δ of observation bushing shell for transformer in real time, dielectric loss is tan δ when normal0As Δ tan δ/tan δ0> 0.5
When, illustrate occur dampness, the defect of shelf depreciation inside bushing shell for transformer.
2. a kind of transformer online monitoring device according to claim 1, which is characterized in that the monitoring device further includes
Display screen and alarm, host computer are connect with display screen and alarm respectively by conductor wire.
3. a kind of transformer online monitoring device according to claim 1, which is characterized in that the monitoring device further includes
The communication control unit of ether fiber optic network communication is carried out with user, data processing and transceiver module or web server.
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| CN107907778B (en) * | 2017-10-31 | 2020-06-19 | 华北电力大学（保定） | Transformer comprehensive fault diagnosis method based on multiple characteristic parameters |
| CN108303593A (en) * | 2017-12-20 | 2018-07-20 | 国网北京市电力公司 | The detection method of casing imperfection, storage medium, processor |
| DE102018112003A1 (en) * | 2018-05-18 | 2019-11-21 | Maschinenfabrik Reinhausen Gmbh | STATUS ANALYSIS OF AN INDUCTIVE EQUIPMENT |
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| CN109787360A (en) * | 2019-02-22 | 2019-05-21 | 合肥齐泰光电科技有限公司 | A kind of real time on-line monitoring device of for transformer |
| CN111856169B (en) * | 2019-04-22 | 2023-03-14 | 宁波奥克斯智能科技股份有限公司 | Transformer fault detection method and system |
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| CN204115768U (en) * | 2014-09-18 | 2015-01-21 | 国家电网公司 | A kind of transformer online monitoring equipment |
| CN105321692A (en) * | 2015-12-03 | 2016-02-10 | 国家电网公司 | Intelligent transformer |
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