CN110057489A - A kind of power transformer on-Line Monitor Device and method based on transient state oil pressure feature - Google Patents
A kind of power transformer on-Line Monitor Device and method based on transient state oil pressure feature Download PDFInfo
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- CN110057489A CN110057489A CN201910375876.7A CN201910375876A CN110057489A CN 110057489 A CN110057489 A CN 110057489A CN 201910375876 A CN201910375876 A CN 201910375876A CN 110057489 A CN110057489 A CN 110057489A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L15/00—Devices or apparatus for measuring two or more fluid pressure values simultaneously
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Abstract
A kind of power transformer on-Line Monitor Device and method based on transient state oil pressure feature, including transient state oil pressure feature measurement module, signal condition and acquisition module and digital processing analysis module；Transient state oil pressure feature measurement module and signal condition are connected with acquisition module, and signal condition is connected with acquisition module and digital processing analysis module, and data memory module, human-computer dialogue module and data communication interface module are connected with digital processing analysis module.The present invention obtains multiple measuring point transient state oil pressure characteristic informations inside oil tank of transformer, the movement oil pressure value of computational representation transformer oil pressure amplitude degree, by compared with preset overpressure threshold value, quasi- over-voltage threshold value, judging whether tested transformer is abnormal over-voltage in real time.Apparatus of the present invention have many advantages, such as that composition is simple, are easily achieved, is reliable accurate independently of electric power networks.
Description
Technical field
The invention belongs to field of power systems, are related to a kind of power transformer on-line monitoring dress based on transient state oil pressure feature
It sets and method, for measuring, recording, analyzing oil-immersed power transformer transient state oil pressure feature, and transformer station high-voltage side bus is assessed with this
State.
Background technique
As a kind of main apparatus of key, transformer occupies very important status in the power system, it steady
Fixed operation is to guarantee the important prerequisite of entire electric system electric energy reliable transmission, flexible allocation and safe handling.With power train
The continuous improvement of system capacity, voltage class, to the reliability of power transformer, safety, more stringent requirements are proposed.However,
Summer electricity peak period, because transformer body explosion, fire accident caused by internal fault happen occasionally.Particularly with high electricity
The hinge transformer for pressing grade, large capacity, is involved great expense, structure is complicated due to itself, and has a large amount of loads, once it explodes
Fire will lead to serious economic loss.In addition, containing tens of tons of flammable insulating oils inside high-power transformer, it is on fire from explosion to be bound to
Lead to that hot oil splashes, the flames lit up the sky, seriously threatens operations staff or even the surrounding resident security of the lives and property in station, seriously affect society
It can stablize.
Transformer oil as petroleum extract has lower good insulation preformance, viscosity, good heat-transfer and manufacturing cost
Low advantage.From at the end of the 19th century, power transformer just starts to fill this alkanes heavy oil conduct and cool down to make with dielectric
With.Other than the Small And Medium Capacity transformer of some specific uses and respective gases insulating transformer, use transformer oil as
In electric system under the oil-immersed transformer of filler is widely used in different capabilities, voltage class requires.
Currently, large-scale power transformer is oil-immersed power transformer, fuel tank internal contains several tons or even tens of
The transformer insulation oil of ton.To the monitoring of the instantaneous oil pressure feature of transformer insulation oil for assessing the operating status of transformer, sentence
It is significant whether disconnected transformer breaks down.On the one hand, serious overheat or electric arc occur inside oil-immersed power transformer
When failure, liquid dielectric oil by by instant vaporization, be decomposed to form can bubble in the height with certain volume.In holding for failure electric energy
Under continuous injection, failure bubble inner pressure is also constantly increased, simultaneously because nearby there are expanding inert, failures for liquid dielectric oil for fault point
Gas liquid film between bubble and surrounding liquid dielectric oil necessarily leads to significant pressure rise, and in the form of pressure wave
Oil tank of transformer internal communication causes the entirety of fuel tank internal oil pressure to rise sharply.On the other hand, when overheat event occurs for inside transformer
When barrier, the rising for the oil temperature that insulate also results in the variation of insulating oil oil pressure.Therefore, for oil tank of transformer internal oil pressure
Real-time measurement, record, operation, analysis have important reference for transformer operation maintenance personnel assessment transformer safety operating status
Value.
Summary of the invention
The object of the present invention is to provide a kind of power transformer on-Line Monitor Device and method based on transient state oil pressure feature,
For measuring, recording, analyzing oil-immersed power transformer transient state oil pressure feature, and running state of transformer is assessed with this.
To achieve the above object, the present invention adopts the following technical scheme that:
A kind of power transformer on-Line Monitor Device based on transient state oil pressure feature, including transient state oil pressure feature measurement mould
Block, signal condition and acquisition module and digital processing analysis module；Transient state oil pressure feature measurement module and signal condition with
Acquisition module is connected, and signal condition is connected with acquisition module and digital processing analysis module, data memory module, human-computer dialogue mould
Block and data communication interface module are connected with digital processing analysis module；
Oil pressure variation characteristic of the transient state oil pressure feature measurement module for different location inside measuring transformer, and export
Corresponding analog voltage/current signal；
The analog voltage/current that signal condition and acquisition module are used to receive the output of transient state oil pressure feature measurement module is believed
Number, and it is converted into the standardized digital signal that digital processing analysis module can identify, then outputting standard digital signal；
Digital processing analysis module is completed at standardized digital signal for executing monitoring operation after receiving standardized digital signal
Reason task, to realize the on-line monitoring and running state of transformer evaluation function to fuel tank internal transient state oil pressure.
A further improvement of the present invention lies in that transient state oil pressure feature measurement module is sensed by several high frequency dynamic oil pressure
Device and its communications cable composition；High frequency dynamic oil pressure sensor is mounted on transformer body, sensor end probe directly with
Transformer insulation oil is in contact, and with the internal oil pressure variation characteristic of measuring transformer different location, and is exported using the communications cable
Corresponding analog voltage/current signal.
A further improvement of the present invention lies in that the measurement frequency of high frequency dynamic oil pressure sensor is 20kHz, measurement error is small
In 1%, operating temperature is -45~120 DEG C, and range is -0.1~6MPa.
A further improvement of the present invention lies in that signal condition and acquisition module are by connecting terminal, signal conditioning circuit, low pass
Filter, signal sample circuit and modulus A/D conversion circuit composition；Connecting terminal is connected with signal conditioning circuit, signal tune
Reason circuit is connected with low-pass filter, and low-pass filter is connected with signal sample circuit, and signal sample circuit and modulus A/D are converted
Circuit is connected；Connecting terminal is also connected with the communications cable.
A further improvement of the present invention lies in that digital processing analysis module by bus, central processing unit, GPS synchronised clock,
Random access memory, read-only memory and control circuit composition；Central processing unit, GPS synchronised clock, random access memory and control
Circuit processed is connected with bus；Modulus A/D conversion circuit is connected with bus；Bus includes data/address bus, address bus and control
Bus processed realizes data exchange and operation control；Central processing unit is chip microprocessor, general purpose microprocessor or digital signal
Processor realizes Digital Signal Processing；GPS synchronised clock for realizing in substation, each station device synchronized sampling of system wants
It asks；Random access memory is for keeping in ephemeral data, data information, calculation processing including signal condition and acquisition module input
The intermediate result of journey；It is read-only memory for saving data；Control circuit realizes entire number using field programmable gate array
The connection and co-ordination of circuit.
A further improvement of the present invention lies in that further including the data memory module being connected with digital processing analysis module, people
Machine session module and data communication interface module；
Data memory module is used for the storage of data；
Human-computer dialogue module is used for the informational linkage established between on-Line Monitor Device and user, so as to operations staff couple
Manual operation, debugging and the information feedback of on-Line Monitor Device；
Data communication interface module is transmitted for realizing information exchange, the data between other equipment and master station, is remote
Side's operation and remote maintenance.
A further improvement of the present invention lies in that data memory module is made of main flash memory and secondary flash memories；
Major and minor flash memories are used as the main memory and shelf storage of on-Line Monitor Device；
Human-computer dialogue module includes compact keyboard, display screen, indicator light, button and printer interface；
Data communication interface module follows 61850 communication protocol of IEC, using Ethernet realization with other equipment and always
Information exchange, data transmission, remote operation and remote maintenance between standing.
A kind of monitoring method based on the above-mentioned power transformer on-Line Monitor Device based on transient state oil pressure feature, including
Following steps:
1. oil pressure variation characteristic of the transient state oil pressure feature measurement module for different location inside measuring transformer, that is, read
Take n measuring point oil pressure p of inside transformer under current time tms.n(t), 1,2,3 n ...；And export corresponding simulation
Voltage/current signals；Signal condition and acquisition module be used to receive the analog voltage of transient state oil pressure feature measurement module output/
Current signal, and it is converted into the standardized digital signal that digital processing analysis module can identify, then outputting standard number letter
Number；
2. digital processing analysis module judges the instantaneous oil pressure p of each measuring point after receiving standardized digital signalms.n(t) and it is default
Start threshold pstSize, if the instantaneous oil pressure p of any measuring pointms.n(t) it is more than or equal to default starting threshold pst, i.e. formula (1) establishment,
It then enters step 3.；If whole measuring point oil pressure are respectively less than default starting threshold pst, i.e. formula (1) is invalid, then shows in transformer
Portion's oil pressure is normal, enters step 5.；
pms.n(t)-pst≥0 (1)
3. calculating the movement oil pressure p of each measuring point t moment using following formulaop.n(t):
In formula (2), T is data window length, and f is the signal sampling frequencies of acquisition module；
Judgement acts oil pressure pop.n(t) with over voltage alarm threshold pth.1Size, if movement oil pressure pop.n(t) it is more than or equal to
Over voltage alarm threshold pth.1, i.e., formula (3) set up, then issue inside transformer over-voltage warning, enter step 5.；If acting oil pressure
pop.n(t) it is less than over voltage alarm threshold, i.e. formula (3) is invalid, then enters step 4.；
pop.n(t)-pth.1≥0 (3)
4. judgement acts oil pressure pop.n(t) with quasi- over-voltage early warning threshold pth.2Size, if pop.n(t) it is more than or equal to quasi- mistake
Press early warning threshold pth.2, i.e., formula (4) set up, then issue the quasi- over-voltage early warning of fuel tank internal, enter step 5.；If pop.n(t) it is less than standard
Over-voltage early warning threshold pth.2, i.e. formula (4) is invalid, then shows that fuel tank internal oil pressure is normal；
pop.n(t)-pth.2≥0 (4)
5. the obtained oil pressure data of storage measurement, and by oil pressure data communication to master station；
6. self-test is carried out under operation, issues alarm signal if finding plant failure and is latched whole device, etc.
To technical staff's debugging, manual reset；If not finding plant failure, 1. return step, re-reads subsequent time oil pressure
pms.n(t+1)。
A further improvement of the present invention lies in that step 2. in, preset starting threshold pstIt is set as 35kPa；
Step 3. in, data window length T be 5 × 10-3S, over voltage alarm threshold pth.1For 70kPa.
A further improvement of the present invention lies in that step 4. in, quasi- over-voltage early warning threshold pth.2For 55kPa.
Compared with prior art, the invention has the benefit that
Spy is changed by the internal oil pressure of transient state oil pressure feature measurement module measuring transformer different location in the present invention
No matter sign from precision or use scope can meet power transformer internal high temperature, greasy dirt, strong electromagnetic environmental requirement；This hair
Bright on-Line Monitor Device independently of electric power networks, the measurement of oil pressure feature and signal transmission be disturbed it is smaller, also not to electricity
Force system harmonic；Digital processing analysis module be fully able to meet handle multi-path quickly, in real time, high-frequency data is wanted
It asks.The present invention has many advantages, such as that composition is simple, is easily achieved, is reliable efficient.
Further, use measurement frequency for 20kHz in the present invention, measurement error less than 1%, operating temperature for -45~
120 DEG C, range is the high frequency dynamic oil pressure sensor of -0.1~6MPa, and no matter high frequency dynamic oil pressure sensor from precision or makes
Power transformer internal high temperature, greasy dirt, strong electromagnetic environmental requirement can be met with range.
The present invention is in monitoring, to transient state oil pressure feature measurement module, signal condition and acquisition module, number
It manages analysis module and carries out physical connection and function cooperation, form the power transformer based on transient state oil pressure feature and monitor dress on-line
It sets.Meanwhile monitoring device is controlled according to on-line monitoring principle and functional requirement, it realizes to tested transformer transients oil pressure
The operation such as measurement, operation, record, communication.Pass through filtering to the multiple measuring point transient state oil pressure data of inside transformer and integral
Operation obtains and is capable of the movement oil pressure of complete characterization inside transformer oil pressure mean kinetic energy, by with default starting threshold, over-voltage
Alarm threshold and quasi- over-voltage early warning threshold are compared, and realize real-time monitoring and assessment to inside transformer oil pressure level.
Application of the invention in real time, accurately, reliably obtains oil tank of transformer transient state oil pressure data for transformer station high-voltage side bus personnel, assessment becomes
Depressor, which is safely operated state, has important Practical meaning.Apparatus of the present invention can be run reliably and with long-term, not by strong electromagnetic,
Oil pollution environment influences, and has the advantages that the speed of response is fast, measurement frequency is high, not to electric system harmonic in operational process,
Primary, secondary device normal operation in substation is not influenced.
Detailed description of the invention
Fig. 1 is the device of the invention structure principle chart.
Fig. 2 is logical flow chart of the invention.
Fig. 3 is the transformer online monitoring device field test measured result based on transient state oil pressure feature.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawing.
Referring to Fig. 1, a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature, comprising: transient state oil pressure is special
Levy measurement module, signal condition and acquisition module, digital processing analysis module, data memory module, human-computer dialogue module with
And data communication interface module.Transient state oil pressure feature measurement module and signal condition are connected with acquisition module, signal condition with
Acquisition module is connected with digital processing analysis module, data memory module, human-computer dialogue module and data communication interface module
It is connected with digital processing analysis module.
Transient state oil pressure feature measurement module is made of n high frequency dynamic oil pressure sensor and its communications cable.High frequency is dynamic
State oil pressure sensor is mounted on transformer body, and sensor end probe needs directly to be in contact with transformer insulation oil, to survey
The internal oil pressure variation characteristic of quantitative change depressor different location, and corresponding analog voltage/electricity is exported using the communications cable
Flow signal.
Signal condition and acquisition module by connecting terminal, signal conditioning circuit, low-pass filter, signal sample circuit and
Modulus (A/D) conversion circuit composition.Connecting terminal is connected with signal conditioning circuit, signal conditioning circuit and low-pass filter phase
Even, low-pass filter is connected with signal sample circuit, and signal sample circuit is connected with modulus A/D conversion circuit；Connecting terminal is also
It is connected with the communications cable.Signal condition and acquisition module are used to receive the simulation electricity of transient state oil pressure feature measurement module output
Pressure/current signal, and it is converted into the standardized digital signal that digital processing analysis module can identify, then outputting standard number
Signal.
Digital processing analysis module by bus, central processing unit (CPU), GPS synchronised clock, random access memory (RAM), only
Read memory (ROM) and control circuit composition.Central processing unit, GPS synchronised clock, random access memory, read-only memory with
And control circuit is connected with bus；Modulus A/D conversion circuit is connected with bus；Bus includes data/address bus, address bus, control
Bus processed realizes data exchange and operation control etc..Central processing unit (CPU) is commander's maincenter of digital processing analysis module,
Number can be realized real-time, quickly by devices such as chip microprocessor, general purpose microprocessor and digital signal processors (DSP)
Word signal processing.Using GPS synchronised clock, realize in substation, each station device stringent synchronization sampling request of system.It deposits at random
Reservoir (RAM) is for the temporary a large amount of ephemeral datas for needing fast exchange, the data including signal condition and acquisition module input
Information, intermediate result of calculation processes etc..Read-only memory (ROM) is for saving data.Control circuit can using scene
Program effective connection and co-ordination that gate array (FPGA) realizes entire digital circuit.Digital processing analysis module is for receiving
Monitoring operation is executed after standardized digital signal, completes digital signal processing tasks, commands the normal operation of adjacent modules, realizes number
According to exchange and operation control, function is assessed to the on-line monitoring and running state of transformer of fuel tank internal transient state oil pressure to realize
Energy.
Data memory module is used for the storage of data；Data memory module is by major and minor flash memories (Flash
Memory it) forms.Major and minor flash memories are used as the main memory and shelf storage of on-Line Monitor Device.
Human-computer dialogue module includes compact keyboard, display screen, indicator light, button and printer interface etc..For establishing
Informational linkage between on-Line Monitor Device and user, manual operation, debugging so as to operations staff to on-Line Monitor Device
And obtain information feedback etc..
Data communication interface module follows 61850 communication protocol of IEC, using Ethernet realization with other equipment and always
Information exchange, data transmission, remote operation and remote maintenance between standing etc..
Referring to fig. 2, such as monitoring method of the above-mentioned power transformer on-Line Monitor Device based on transient state oil pressure feature, according to
On-line monitoring principle and functional requirement control on-Line Monitor Device, realize to the measurement of tested transformer transients oil pressure,
The operation such as operation, record, communication and status assessment.Detailed process is as follows:
1. system is first carried out after power turn-on (referred to as powering on) or hardware reset (referred to as resetting) in on-Line Monitor Device
Initialization, makes whole device be in normal operating conditions.
2. executing comprehensive self-test after powering on, correctness, integrity detection are carried out to the working condition of itself, if discovery dress
It sets defect then to issue alarm signal and be latched whole device, waits technical staff's debugging, manual reset.
3. if oil pressure of the transient state oil pressure feature measurement module for different location inside measuring transformer becomes by self-test
Change feature, i.e. n measuring point oil pressure p of inside transformer under reading current time tms.n(t), 1,2,3 n ...；And it exports therewith
Corresponding analog voltage/current signal；Signal condition is defeated for receiving transient state oil pressure feature measurement module with acquisition module
Analog voltage/current signal out, and it is converted into the standardized digital signal that digital processing analysis module can identify, then defeated
Standardized digital signal out；
4. digital processing analysis module judges the instantaneous oil pressure p of each measuring point after receiving standardized digital signalms.n(t) and it is default
Start threshold pstSize, start threshold pstIt usually may be set to 35kPa.If any instantaneous oil pressure p of measuring pointms.n(t) be greater than etc.
In starting threshold pst, i.e., formula (1) set up, then enter step 5.；If whole measuring point oil pressure, which are respectively less than, starts threshold pst, i.e. formula (1)
It is invalid, then it shows that inside transformer oil pressure is normal, enters step 7..
pms.n(t)-pst≥0 (1)
5. calculating the movement oil pressure p of each measuring point t moment using following formulaop.n(t):
In formula (2), T is data window length, can take 5 × 10-3s.F is the signal sampling frequencies of acquisition module.Judgement is dynamic
Make oil pressure pop.n(t) with over voltage alarm threshold pth.1Size, pth.1It usually may be set to 70kPa, if movement oil pressure pop.n(t)
More than or equal to over voltage alarm threshold pth.1, i.e., formula (3) set up, then issue inside transformer over-voltage warning；If acting oil pressure pop.n
(t) it is less than over voltage alarm threshold, i.e. formula (3) is invalid, then enters step 6..
pop.n(t)-pth.1≥0 (3)
6. judgement acts oil pressure pop.n(t) with quasi- over-voltage early warning threshold pth.2Size, pth.2It usually may be set to 55kPa,
If pop.n(t) it is more than or equal to quasi- over-voltage early warning threshold pth.2, i.e., formula (4) set up, then issue the quasi- over-voltage early warning of fuel tank internal；If
pop.n(t) it is less than quasi- over-voltage early warning threshold pth.2, i.e. formula (4) is invalid, then shows that fuel tank internal oil pressure is normal.
pop.n(t)-pth.2≥0 (4)
7. the obtained oil pressure data of storage measurement, and by oil pressure data communication to master station.
8. self-test is carried out under operation, issues alarm signal if finding plant failure and is latched whole device, etc.
To technical staff's debugging, manual reset.If not finding plant failure, 3. return step, re-reads subsequent time oil pressure
pms.n(t+1)。
The present invention is by analyzing mould to transient state oil pressure feature measurement module, signal condition and acquisition module, digital processing
Block, data memory module, human-computer dialogue module and data communication interface module carry out physical connection and function cooperation, form base
In the power transformer on-Line Monitor Device of transient state oil pressure feature.Meanwhile according to on-line monitoring principle and functional requirement to online
Monitoring device is controlled, and is realized and is operated to measurement, operation, record, communication of tested transformer transients oil pressure etc..
Apparatus of the present invention can be realized under the premise of not destroying transformer existing structure integrality to fuel tank internal oil pressure
The measurement of real-time digital formula, the acquisition, operation of characteristic information.Further, it uses measurement frequency for 20kHz in the present invention, measures
For error less than 1%, operating temperature is -45~120 DEG C, and range is the silicon piezoresistance type high frequency dynamic pressure sensing of -0.1~6MPa
No matter device from precision or use scope can meet power transformer internal high temperature, greasy dirt, forceful electric power magnetic environment；Of the invention
On-line monitoring independently of electric power networks, the measurement and transmission of pressure characteristic be disturbed it is smaller, it is also not humorous to electric system injection
Wave；Data sampling and processing element is fully able to meet the requirement for handling multi-path, high-frequency data quickly, in real time.The present invention has
Constitute simple, the advantages that being easily achieved, is reliable efficient.
Further, the present invention is by the filtering and integral operation to the multiple measuring point transient state oil pressure data of inside transformer,
Obtain and be capable of the movement oil pressure of complete characterization inside transformer oil pressure mean kinetic energy, by with default starting threshold, over voltage alarm
Threshold and quasi- over-voltage early warning threshold are compared, and realize real-time monitoring and assessment to inside transformer oil pressure level.This hair
Bright to propose a kind of power transformer on-Line Monitor Device and method based on transient state oil pressure feature originally, of the invention answers
It is transported with acquisition oil tank of transformer transient state oil pressure data real-time for transformer station high-voltage side bus personnel, accurate, reliable, assessment transformer safety
Row state has important Practical meaning.Apparatus of the present invention can be run reliably and with long-term, not by strong electromagnetic, oil pollution environment shadow
It rings, has the advantages that the speed of response is fast, measurement frequency is high, do not influence power transformation to electric system harmonic in operational process
Primary, secondary device normal operation in standing.
Field test is carried out by test platform of SFSZ8-40000/110 three-phase three-winding transformer, illustrates effect of the present invention
Fruit, the main geometry of type transformer and nameplate parameter are as shown in table 1.As shown in figure 3, (the t when the transformer operates normally
< 0ms), there are not significant changes in oil tank of transformer internal oil pressure, the movement oil pressure that present apparatus operation result of measurement obtains at this time
pop.1、pop.2、pop.3It is much smaller than over voltage alarm threshold pth.1And quasi- over-voltage early warning threshold pth.2, the device will not issue alarm or
Pre-warning signal, and show that transformer body internal oil pressure is normal.When transformer happens suddenly interior unit cell model at the t=0ms moment, by
In the injection of fault energy, each measuring point oil pressure of inside transformer will be increased rapidly.When t=10.68ms, apparatus of the present invention measurement fortune
Obtained movement oil pressure pop.1It takes the lead in being greater than quasi- over-voltage early warning threshold pth.2, apparatus of the present invention will issue quasi- over-voltage early warning.T=
When 12.95ms, movement oil pressure p that apparatus of the present invention operation result of measurement obtainsop.1It takes the lead in being greater than over voltage alarm threshold pth.1, the present invention
Device will issue transformer over-voltage warning.Fieldtesting results show: apparatus of the present invention, can perceive and obtain in a very short period of time
Oil-immersed power transformer internal pressure variation characteristic is taken, and is obtained by calculation and can characterize inside transformer oil pressure danger water
Flat movement oil pressure, is compared according to preset, assesses transformer current operating conditions and level of security.For scene fortune
Administrative staff and Transformer Manufacturing Enterprises provide important reference data and judging basis.
The main geometry of 1 SFSZ8-40000/110 type transformer of table and nameplate parameter
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off
Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute
Claims of submission determine scope of patent protection.
Claims (10)
1. a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature, which is characterized in that special including transient state oil pressure
Levy measurement module, signal condition and acquisition module and digital processing analysis module；Transient state oil pressure feature measurement module and
Signal condition is connected with acquisition module, and signal condition is connected with acquisition module and digital processing analysis module, data memory module,
Human-computer dialogue module and data communication interface module are connected with digital processing analysis module；
Oil pressure variation characteristic of the transient state oil pressure feature measurement module for different location inside measuring transformer, and export therewith
Corresponding analog voltage/current signal；
Signal condition and acquisition module are used to receive the analog voltage/current signal of transient state oil pressure feature measurement module output,
And it is converted into the standardized digital signal that digital processing analysis module can identify, then outputting standard digital signal；
Digital processing analysis module is completed standardized digital signal processing and is appointed for executing monitoring operation after receiving standardized digital signal
Business, to realize the on-line monitoring and running state of transformer evaluation function to fuel tank internal transient state oil pressure.
2. a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 1, feature
It is, transient state oil pressure feature measurement module is made of several high frequency dynamic oil pressure sensors and its communications cable；High frequency is dynamic
State oil pressure sensor is mounted on transformer body, and sensor end probe is directly in contact with transformer insulation oil, with measurement
The internal oil pressure variation characteristic of transformer different location, and corresponding analog voltage/current is exported using the communications cable
Signal.
3. a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 2, feature
It is, the measurement frequency of high frequency dynamic oil pressure sensor is 20kHz, and for measurement error less than 1%, operating temperature is -45~120
DEG C, range is -0.1~6MPa.
4. a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 2, feature
It is, signal condition and acquisition module are by connecting terminal, signal conditioning circuit, low-pass filter, signal sample circuit and mould
Number A/D conversion circuit composition；Connecting terminal is connected with signal conditioning circuit, and signal conditioning circuit is connected with low-pass filter, low
Bandpass filter is connected with signal sample circuit, and signal sample circuit is connected with modulus A/D conversion circuit；Connecting terminal also with communication
Cable is connected.
5. a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 2, feature
Be, digital processing analysis module by bus, central processing unit, GPS synchronised clock, random access memory, read-only memory and
Control circuit composition；Central processing unit, GPS synchronised clock, random access memory and control circuit are connected with bus；Modulus A/
D conversion circuit is connected with bus；Bus includes data/address bus, address bus and control bus, realizes data exchange and operation
Control；Central processing unit is chip microprocessor, general purpose microprocessor or digital signal processor, realizes Digital Signal Processing；
GPS synchronised clock for realizing in substation, system each station device synchronized sampling requirement；Random access memory is for temporary interim
Data, the intermediate result of data information, calculation processes including signal condition and acquisition module input；Read-only memory is used
The connection and co-ordination of entire digital circuit are realized using field programmable gate array in preservation data control circuit.
6. a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 1, feature
It is, further includes the data memory module being connected with digital processing analysis module, human-computer dialogue module and data communication interface
Module；
Data memory module is used for the storage of data；
Human-computer dialogue module is used for the informational linkage established between on-Line Monitor Device and user, so that operations staff is to online
Manual operation, debugging and the information feedback of monitoring device；
Data communication interface module is for realizing the information exchange between other equipment and master station, data transmission, distant place behaviour
Work and remote maintenance.
7. a kind of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 6, feature
It is, data memory module is made of main flash memory and secondary flash memories；Major and minor flash memories are as on-line monitoring
The main memory and shelf storage of device use；
Human-computer dialogue module includes compact keyboard, display screen, indicator light, button and printer interface；
Data communication interface module follows 61850 communication protocol of IEC, using Ethernet realize with other equipment and master station it
Between information exchange, data transmission, remote operation and remote maintenance.
8. a kind of power transformer based on transient state oil pressure feature as described in any one of claim 1-7 monitors dress on-line
The monitoring method set, which comprises the following steps:
1. oil pressure variation characteristic of the transient state oil pressure feature measurement module for different location inside measuring transformer, that is, read and work as
N measuring point oil pressure p of inside transformer under preceding moment tms.n(t), 1,2,3 n ...；And export corresponding simulation electricity
Pressure/current signal；Signal condition and acquisition module are used to receive analog voltage/electricity of transient state oil pressure feature measurement module output
Signal is flowed, and is converted into the standardized digital signal that digital processing analysis module can identify, then outputting standard digital signal；
2. digital processing analysis module judges the instantaneous oil pressure p of each measuring point after receiving standardized digital signalms.n(t) start with default
Threshold pstSize, if the instantaneous oil pressure p of any measuring pointms.n(t) it is more than or equal to default starting threshold pst, i.e., formula (1) set up, then into
Enter step 3.；If whole measuring point oil pressure are respectively less than default starting threshold pst, i.e. formula (1) is invalid, then shows inside transformer oil
Positive pressure is normal, enters step 5.；
pms.n(t)-pst≥0 (1)
3. calculating the movement oil pressure p of each measuring point t moment using following formulaop.n(t):
In formula (2), T is data window length, and f is the signal sampling frequencies of acquisition module；
Judgement acts oil pressure pop.n(t) with over voltage alarm threshold pth.1Size, if movement oil pressure pop.n(t) it is more than or equal to over-voltage
Alarm threshold pth.1, i.e., formula (3) set up, then issue inside transformer over-voltage warning, enter step 5.；If acting oil pressure pop.n(t)
Less than over voltage alarm threshold, i.e. formula (3) is invalid, then enters step 4.；
pop.n(t)-pth.1≥0 (3)
4. judgement acts oil pressure pop.n(t) with quasi- over-voltage early warning threshold pth.2Size, if pop.n(t) it is pre- to be more than or equal to quasi- over-voltage
Alert threshold pth.2, i.e., formula (4) set up, then issue the quasi- over-voltage early warning of fuel tank internal, enter step 5.；If pop.n(t) it is less than quasi- over-voltage
Early warning threshold pth.2, i.e. formula (4) is invalid, then shows that fuel tank internal oil pressure is normal；
pop.n(t)-pth.2≥0 (4)
5. the obtained oil pressure data of storage measurement, and by oil pressure data communication to master station；
6. carrying out self-test under operation, issuing alarm signal if finding plant failure and being latched whole device, skill is waited
Art personnel debugging, manual reset；If not finding plant failure, 1. return step, re-reads subsequent time oil pressure pms.n
(t+1)。
9. a kind of monitoring side of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 8
Method, which is characterized in that step 2. in, preset starting threshold pstIt is set as 35kPa；
Step 3. in, data window length T be 5 × 10-3S, over voltage alarm threshold pth.1For 70kPa.
10. a kind of monitoring of power transformer on-Line Monitor Device based on transient state oil pressure feature according to claim 8
Method, which is characterized in that step 4. in, quasi- over-voltage early warning threshold pth.2For 55kPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631762A (en) * | 2019-11-01 | 2019-12-31 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN112013983A (en) * | 2020-08-28 | 2020-12-01 | 重庆大学 | Transformer multipoint temperature and oil pressure combined monitoring device and method based on differential inductive sensor |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001124648A (en) * | 1999-10-29 | 2001-05-11 | Mitsubishi Electric Corp | Pressure measuring device |
| CN2596199Y (en) * | 2002-12-30 | 2003-12-31 | 管延波 | Over-pressure protector for electromagnetic instrument pressure container |
| US20050223782A1 (en) * | 2004-04-07 | 2005-10-13 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| KR20080076489A (en) * | 2007-02-16 | 2008-08-20 | 주식회사 한솔테크 | Fault pressure relay for power transformer |
| CN201397375Y (en) * | 2009-05-12 | 2010-02-03 | 上海电力变压器修试厂有限公司 | Pressure detection device for pressure relay |
| CN202420748U (en) * | 2011-12-30 | 2012-09-05 | 天威云南变压器股份有限公司 | Monitoring system for oil pressure in transformer oil tank |
| CN103278312A (en) * | 2013-03-30 | 2013-09-04 | 国家电网公司 | Method and device for verifying pressure relief valve of transformer |
| CN103683193A (en) * | 2013-12-06 | 2014-03-26 | 国家电网公司 | Transformer microcomputer protection device for automatic constant value setting |
| CN204009562U (en) * | 2014-08-27 | 2014-12-10 | 山东电力设备有限公司 | Transformer body travel position on-line monitoring system |
| CN105185542A (en) * | 2015-10-20 | 2015-12-23 | 夏烬楚 | Explosion-proof 75MVA transformer system |
| CN105529212A (en) * | 2014-10-23 | 2016-04-27 | 黑龙江宏宇电站设备有限公司 | Oil tank pressure relay protection device and protection method for transformer |
| US9377341B1 (en) * | 2013-04-12 | 2016-06-28 | Joe David Watson | Electronic liquid level sensing device and gauge for liquid-immersed power transformers, reactors and similar equipment |
| CN106207969A (en) * | 2016-08-08 | 2016-12-07 | 河南开启电力实业有限公司 | Transformer station's oil-filled transformer on-line monitoring early warning system |
| CN208206204U (en) * | 2018-06-19 | 2018-12-07 | 三峡大学 | Network distribution transformer on-Line Monitor Device based on GPS positioning |
| CN109713640A (en) * | 2019-02-28 | 2019-05-03 | 西安交通大学 | The digital non-ionizing energy loss method of oil-immersed transformer based on pressure characteristic |
-
2019
- 2019-05-07 CN CN201910375876.7A patent/CN110057489B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001124648A (en) * | 1999-10-29 | 2001-05-11 | Mitsubishi Electric Corp | Pressure measuring device |
| CN2596199Y (en) * | 2002-12-30 | 2003-12-31 | 管延波 | Over-pressure protector for electromagnetic instrument pressure container |
| US20050223782A1 (en) * | 2004-04-07 | 2005-10-13 | Hitachi Industrial Equipment Systems Co., Ltd. | Transformer monitoring system |
| KR20080076489A (en) * | 2007-02-16 | 2008-08-20 | 주식회사 한솔테크 | Fault pressure relay for power transformer |
| CN201397375Y (en) * | 2009-05-12 | 2010-02-03 | 上海电力变压器修试厂有限公司 | Pressure detection device for pressure relay |
| CN202420748U (en) * | 2011-12-30 | 2012-09-05 | 天威云南变压器股份有限公司 | Monitoring system for oil pressure in transformer oil tank |
| CN103278312A (en) * | 2013-03-30 | 2013-09-04 | 国家电网公司 | Method and device for verifying pressure relief valve of transformer |
| US9377341B1 (en) * | 2013-04-12 | 2016-06-28 | Joe David Watson | Electronic liquid level sensing device and gauge for liquid-immersed power transformers, reactors and similar equipment |
| CN103683193A (en) * | 2013-12-06 | 2014-03-26 | 国家电网公司 | Transformer microcomputer protection device for automatic constant value setting |
| CN204009562U (en) * | 2014-08-27 | 2014-12-10 | 山东电力设备有限公司 | Transformer body travel position on-line monitoring system |
| CN105529212A (en) * | 2014-10-23 | 2016-04-27 | 黑龙江宏宇电站设备有限公司 | Oil tank pressure relay protection device and protection method for transformer |
| CN105185542A (en) * | 2015-10-20 | 2015-12-23 | 夏烬楚 | Explosion-proof 75MVA transformer system |
| CN106207969A (en) * | 2016-08-08 | 2016-12-07 | 河南开启电力实业有限公司 | Transformer station's oil-filled transformer on-line monitoring early warning system |
| CN208206204U (en) * | 2018-06-19 | 2018-12-07 | 三峡大学 | Network distribution transformer on-Line Monitor Device based on GPS positioning |
| CN109713640A (en) * | 2019-02-28 | 2019-05-03 | 西安交通大学 | The digital non-ionizing energy loss method of oil-immersed transformer based on pressure characteristic |
Non-Patent Citations (3)
| Title |
|---|
| YAN C , HAO Z , DANG Y , ET AL.: "Oil Flow Surge Test for 110kV Power Transformer During External Short Circuit faults", 《2016 IEEE POWER AND ENERGY SOCIETY GENERAL MEETING (PESGM)》 * |
| 唐玉玲: "电力变压器油压监测与保护系统设计", 《仪表技术与传感器》 * |
| 闫晨光、郝治国、张保会: "基于压力特征的变压器数字式保护研究", 《中国电机工程学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631762A (en) * | 2019-11-01 | 2019-12-31 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN110631762B (en) * | 2019-11-01 | 2021-06-15 | 国网江苏省电力有限公司电力科学研究院 | Method for determining internal pressure criterion for mutual inductor fault early warning |
| CN112013983A (en) * | 2020-08-28 | 2020-12-01 | 重庆大学 | Transformer multipoint temperature and oil pressure combined monitoring device and method based on differential inductive sensor |
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