CN110132361A - A kind of superconductive current limiter condition monitoring system and state monitoring method - Google Patents
A kind of superconductive current limiter condition monitoring system and state monitoring method Download PDFInfo
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- CN110132361A CN110132361A CN201910484962.1A CN201910484962A CN110132361A CN 110132361 A CN110132361 A CN 110132361A CN 201910484962 A CN201910484962 A CN 201910484962A CN 110132361 A CN110132361 A CN 110132361A
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Abstract
A kind of superconductive current limiter condition monitoring system and method, including superconductive current limiter ontology, liquid nitrogen storage tank, cryogenic refrigerating system, sensor module, real-time data acquisition system and monitoring system；Sensor module includes voltage sensor, temperature sensor, pressure sensor and liquid level sensor；Real-time data acquisition system includes voltage acquisition module, temperature collecting module, pressure acquisition module and liquid level acquisition module, and sensor signal is converted to corresponding digital quantity；Monitoring system carries out analysis and status monitoring to the operating parameter of superconductive current limiter；By being acquired, transmitting to state parameter in superconductive current limiter operational process in real time, the failure criterion of based superconductive current limiter to carry out fault signature analysis to superconductive current limiter, realize the status assessment to superconductive current limiter, and it finds in advance and solves the problems, such as equipment deficiency, equipment and system jam are avoided, the reliability and stability of whole system are improved.
Description
Technical field
The invention belongs to Condition Monitoring Technology field, especially a kind of superconductive current limiter condition monitoring system and status monitoring
Method.
Background technique
Superconductive current limiter is to reach current limliting purpose using superconducting state-normal state transformation physical characteristic of superconductor, just
Loss often when operation is very low, can automatically reset, be very ideal current-limiting apparatus.Once breaking down, lead to not effectively
Limit direct-current short circuit fault current, it will lead to unplanned outage, to directly threaten the safe and stable operation of power grid.
Superconductive current limiter is in the running environment of ultralow temperature, high voltage, electromagnetic viscosimeter, this gives superconductive current limiter status monitoring
Bring great difficulty, traditional sensor ultralow temperature, high voltage, electromagnetic viscosimeter running environment in can not normal work
Make, any a part of whole system, which goes wrong, all will lead to superconductive current limiter and be unable to operate normally.Superconductive current limiter state prison
In survey, on the one hand need the various types of parameter signals of synchronous acquisition, such as temperature, pressure, liquid level guarantee monitoring system into
The accurate accident analysis of row；On the other hand, it carries out data storage and remote transmission is helped to improve and supervised to superconductive current limiter state
Efficiency is surveyed, realizes the effective integration inside superconductive current limiter with external status information.
Currently, realize that one of the most critical element of superconductive current limiter practical application is the holding of low temperature environment, it is traditional
The state monitoring apparatus of superconductive current limiter is not it is difficult to ensure that exemption from inspection operation in entire current limiting system 1 year or more, can guarantee superconduction limit
It flows with the synchronous acquisition of external status information inside device and status assessment and accident analysis is carried out to whole system, therefore for super
It is most important to lead the state parameters such as the liquid level, pressure and temperature of current limiter and low-temperature (low temperature) vessel on-line monitoring.
Summary of the invention
In order to solve the above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of superconductive current limiter states
Monitoring system and detection method can effectively detect the parameter of whole system, reach to superconductive current limiter real-time status assessment and
The purpose of malfunction monitoring.
To achieve the above objectives, the present invention adopts the following technical scheme:
A kind of superconductive current limiter condition monitoring system, including superconductive current limiter ontology 2, liquid nitrogen storage tank 1, cryogenic refrigeration system
System, leakage fluid dram 8, sensor module 9, deconcentrator 10, real time data preprocessing module 11 and monitoring host computer 7；It is characterized by:
The liquid nitrogen storage tank 1 is connected by pipeline with superconductive current limiter ontology 2, provides required liquid for superconductive current limiter ontology
Nitrogen；
In the lower part of superconductive current limiter ontology 2, leakage fluid dram 8 is set；
Cryogenic refrigerating system is set on the top of superconductive current limiter ontology 2, for cooling down the liquid in superconductive current limiter ontology 2
Nitrogen temperature；
Sensor module 9, the biography are set in liquid nitrogen storage tank 1, superconductive current limiter ontology 2 and overfreezing liquid nitrogen Dewar tank 5
Sensor component 9 includes voltage sensor, temperature sensor, pressure sensor and liquid level sensor, superconduction when for detecting operation
Liquid nitrogen in both end voltage, the temperature of liquid nitrogen, the pressure, liquid level of current limiter ontology 2, liquid nitrogen storage tank 1 and overfreezing liquid nitrogen Dewar tank 5
Liquid level；
The acquisition data output end of each sensor is connected to real time data preprocessing module 11, the reality by deconcentrator 10
When data preprocessing module 11 analog signal acquired from sensor module 9 be converted into digital signal be uploaded to monitoring host computer 7；
During steady-state operation, the both end voltage of superconductive current limiter ontology 2, strip temperature value, the pressure value of liquid nitrogen,
Level value, in liquid nitrogen storage tank 1 and overfreezing liquid nitrogen Dewar tank 5 level value of liquid nitrogen need to be maintained at pre-set range it
Interior, if any monitoring parameter exceeds early warning range, monitoring host computer 7 issues early warning, and takes corresponding relay protection measure.
The present invention further comprises following preferred embodiment.
The leakage fluid dram 8 disposes Remote control valve door switch, when liquid nitrogen level is more than early warning liquid in superconductive current limiter ontology
Position, monitoring host computer 7 issue valve opening signal, and when liquid level drops to safety level, valve is closed.
The leakage fluid dram 8 uses steel flange gate valve, and the external world is discharged in liquid nitrogen excessive in superconductive current limiter ontology 2,
Liquid nitrogen level in superconductive current limiter ontology 2 is set to be in a safety levels section always.
The cryogenic refrigerating system includes low temperature liquid nitrogen pump 3, refrigeration machine 4 and overfreezing liquid nitrogen Dewar tank 5, and the one of refrigeration machine 4
End is connected to superconductive current limiter ontology 2 by pipeline, and the other end is connected to overfreezing liquid nitrogen Dewar tank 5, low temperature liquid nitrogen by pipeline
Pump 3 extracts liquid nitrogen from overfreezing liquid nitrogen Dewar tank 5, and liquid nitrogen is pressed into superconductive current limiter ontology 2, overfreezing liquid nitrogen Dewar by pipeline
Tank 5 is connected by exhaust outlet 6 with air, and exhaust outlet 6 is equipped with safety valve, when pressure is subcooled in Dewar container for liquefied nitrogen tank 5 higher than letting out nitrogen valve
Valve opening when setting value.The refrigeration machine 4 is Stirling cycle refrigerator, is fixed in cold Dewar container for liquefied nitrogen tank 5 with ring flange
Nitrogen pressurization, cooling liquid in overfreezing liquid nitrogen Dewar tank 5 are obtained liquid nitrogen by knockout tower by wall, Stirling cycle refrigerator
It is stored in overfreezing liquid nitrogen Dewar tank 5, then low temperature liquid nitrogen pump 3 extracts liquid nitrogen and liquid nitrogen is recycled to superconducting current-limiting by pipeline
In device ontology 2, the temperature of superconducting current-limiting unit is made to be in normal working temperature.
The exhaust outlet 6 lets out nitrogen valve using internal feedback structure, when supercooling 5 internal pressure of Dewar container for liquefied nitrogen tank equipped with nitrogen valve is let out
Higher than nitrogen valve setting value is let out, spool moves up opening valve, nitrogen of outwardly releasing；When tank internal pressure is down to setting value, close
Valve.
The application further simultaneously discloses a kind of superconductive current limiter state monitoring method based on monitoring system above-mentioned, special
Sign is, the state monitoring method the following steps are included:
Step 1: the sensor module by the way that superconductive current limiter ontology is arranged in obtains the voltage value at superconductive current limiter both ends,
Temperature signal, pressure signal and the level value of liquid nitrogen, by the way that liquid nitrogen storage tank is arranged in, the level sensing in overfreezing liquid nitrogen Dewar tank
The liquid nitrogen level value of device acquisition liquid nitrogen storage tank and overfreezing liquid nitrogen Dewar tank；
Step 2: when superconductive current limiter ontology enters operating status, by step 1 sensor module measurement voltage signal,
Temperature signal, liquid nitrogen pressure signal and level value are uploaded to monitoring after real time data preprocessing module carries out analog-to-digital conversion again
Host；
Step 3: when record steady-state operation, i.e., when current limiter ontology both end voltage is 0, the temperature of ontology liquid nitrogen, pressure with
The range of level value, the level value range in liquid nitrogen storage tank, overfreezing liquid nitrogen Dewar tank is as stable state early warning range；
Step 4: in monitoring host computer, the temperature based on heat convection and heat flow density formula estimation superconducting current-limiting unit band
T is spent, steps are as follows:
Wherein, c is the specific heat capacity of liquid nitrogen, and d is sensor at a distance from band, T1For the initial temperature of liquid nitrogen, T2For liquid nitrogen
Temperature when measurement, t T1To T2Time, k is thermal coefficient；
Step 5: under superconducting tape damage, refrigeration system exception, power grid over current fault and four kinds of states of normal current limliting
The voltage value at superconductive current limiter both ends, temperature signal, pressure signal and the level value and liquid nitrogen storage tank and overfreezing liquid nitrogen of liquid nitrogen
The liquid nitrogen level value of Dewar tank respectively carries out 20 measurements, according to the calculation formula of step 4, calculates in each superconductive current limiter ontology
The temperature of band, while band temperature peak is recorded, current limiter ontology both end voltage value, liquid nitrogen pressure when strip temperature reaches peak value
Force value, level value, the level value in liquid nitrogen storage tank, overfreezing liquid nitrogen Dewar tank；
Step 6: the strip temperature peak value that step 5 is calculated, current limiter both end voltage value, liquid nitrogen pressure value, liquid level
Value, level value this six characteristic values in liquid nitrogen storage tank, overfreezing liquid nitrogen Dewar tank are input to BP neural network model training, export
Vector is represented by
Wherein: xi(i=1,2 ..., 6) is input feature vector value；wi, θ respectively indicate connection weight, threshold value, by random number letter
Number generates, and the range of connection weight and threshold value can require certainly between [- 1,1] according to setting output error in the training process
Dynamic adjustment；f(Ii) indicate transmission function, using S type logarithmic function；
Step 7: in steady-state operation, i.e., when current limiter ontology both end voltage is 0, any monitor value is not in stable state early warning value
When in range, start early warning program；In limited current state, i.e., when current limiter ontology both end voltage is not 0, monitor value is passed in real time
It is defeated to arrive monitoring host computer, output valve is obtained by BP neural network model, is compared with the output valve of step 6, judges current limiter
State.
Compared to the prior art the present invention, has the advantages that
1, for the running environment of the ultralow temperature of superconductive current limiter, high voltage, electromagnetic viscosimeter, arrangement can quick response biography
The entire current limiting system of sensor assemblies monitor realizes the on-line synchronous detection of a variety of physical signals, improves superconductive current limiter state
The accuracy of monitoring.
2, design on-line monitoring system communication modes, it is ensured that superconductive current limiter status information can real-time Transmission, pass through
The signal data of entire current limiting system is uploaded to measurement result display screen by IEC61850, is realized and is shown in data set.
3, for temperature, pressure, liquid level signal, after IED is handled, can directly fructufy when be shown in display
In screen, superconductive current limiter various dimensions accident analysis function is realized based on failure criterion, the monitoring of equipment state is completed, early warning, comments
Estimate the advanced application functions such as analysis.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of superconductive current limiter condition monitoring system of the present invention；
Fig. 2 is the flow diagram of superconductive current limiter state monitoring method of the present invention.
Appended drawing reference: 1, liquid nitrogen storage tank；2, superconductive current limiter ontology；3, low temperature liquid nitrogen pump；4, refrigeration machine；5 overfreezing liquid nitrogens
Dewar；6, exhaust outlet；7, system is monitored；8, leakage fluid dram；9, sensor module；10, deconcentrator；11, data preprocessing module；
12, data transmission bus.
Specific embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
As shown in Fig. 1, the invention discloses a kind of superconductive current limiter condition monitoring system,
A kind of superconductive current limiter condition monitoring system, including superconductive current limiter ontology 2, liquid nitrogen storage tank 1, cryogenic refrigeration system
System, leakage fluid dram 8, sensor module 9, deconcentrator 10, real time data preprocessing module 11 and monitoring host computer 7.The liquid nitrogen storage tank 1
It is connected by pipeline with superconductive current limiter ontology 2, provides required liquid nitrogen for superconductive current limiter ontology；In superconductive current limiter ontology 2
Lower part be arranged leakage fluid dram 8；Leakage fluid dram disposes Remote control valve door switch, when liquid nitrogen level is more than pre- in superconductive current limiter ontology
Alert liquid level, monitoring host computer 7 issue valve opening signal, and when liquid level drops to safety level, valve is closed；In superconductive current limiter sheet
Cryogenic refrigerating system is arranged in the top of body 2, for cooling down the liquid nitrogen temperature in superconductive current limiter ontology 2；The cryogenic refrigeration system
System includes low temperature liquid nitrogen pump 3, refrigeration machine 4 and overfreezing liquid nitrogen Dewar tank 5, and one end of refrigeration machine 4 is connected to superconduction limit by pipeline
Device ontology 2 is flowed, the other end is connected to overfreezing liquid nitrogen Dewar tank 5 by pipeline, and low temperature liquid nitrogen pump 3 is taken out from overfreezing liquid nitrogen Dewar tank 5
Liquid nitrogen is taken, and liquid nitrogen is pressed by superconductive current limiter ontology 2 by pipeline, overfreezing liquid nitrogen Dewar tank 5 passes through exhaust outlet 6 and air phase
Even, exhaust outlet 6 is equipped with safety valve, the valve opening when pressure is greater than given threshold in supercooling Dewar container for liquefied nitrogen tank 5；In liquid nitrogen storage tank
1, sensor module 9 is set in superconductive current limiter ontology 2 and overfreezing liquid nitrogen Dewar tank 5, the sensor module 9 is passed including voltage
Sensor, temperature sensor, pressure sensor and liquid level sensor, the both ends electricity of superconductive current limiter ontology 2 when for detecting operation
The liquid level of liquid nitrogen in pressure, the temperature of liquid nitrogen, pressure, liquid level, liquid nitrogen storage tank 1 and overfreezing liquid nitrogen Dewar tank 5；The acquisition of each sensor
Data output end is connected to real time data preprocessing module 11 by deconcentrator 10, and the real time data preprocessing module 11 will be from
The analog signal that sensor module 9 acquires is converted into digital signal and is uploaded to monitoring host computer 7；During steady-state operation, surpass
The both end voltage of current limiter ontology 2 is led, strip temperature value, the pressure value of liquid nitrogen, level value, liquid nitrogen storage tank 1 and overfreezing liquid nitrogen are shut out
Within the scope of the level value of liquid nitrogen needs to be maintained at pre-set in crock 5, if any monitoring parameter exceeds early warning model
It encloses, then monitoring host computer 7 issues early warning, and takes corresponding relay protection measure.
In a preferred embodiment of the invention, the liquid nitrogen storage tank 1 passes through low temperature resistant stainless steel pipes and superconductive current limiter
Ontology 2 is connected, and supplements liquid nitrogen when superconductive current limiter bulk liquid nitrogen hunger for it, is arranged in the lower part of superconductive current limiter ontology 2
Leakage fluid dram 8, leakage fluid dram dispose Remote control valve door switch, when liquid nitrogen level is more than early warning liquid level, prison in superconductive current limiter ontology
It surveys host and issues valve opening signal, valve is closed when liquid level drops to safety level.Wherein, the leakage fluid dram 8 preferably uses
Liquid nitrogen excessive in superconductive current limiter ontology 2 is discharged the external world when necessary, makes superconductive current limiter ontology 2 by steel flange gate valve
Middle liquid nitrogen level is in a safety levels section always.
The cryogenic refrigerating system is used to provide ultralow temperature running environment (78K or so), the low temperature for superconductive current limiter
Refrigeration system includes low temperature liquid nitrogen pump 3, refrigeration machine 4 and overfreezing liquid nitrogen Dewar tank 5, and 5 one end of overfreezing liquid nitrogen Dewar tank passes through pipeline
It is connected to superconductive current limiter ontology 2, low temperature liquid nitrogen pump 3 extracts liquid nitrogen from overfreezing liquid nitrogen Dewar tank 5 and passes through pipeline for liquid nitrogen pressure
Enter superconductive current limiter ontology 2, overfreezing liquid nitrogen Dewar tank 5 is connected by exhaust outlet 6 with air, and exhaust outlet 6 installs safety valve, has been served as
Valve opening when pressure is greater than given threshold in cold Dewar container for liquefied nitrogen tank 5, extra nitrogen can be discharged, prevent pressure anomaly
Persistently increase the safety accident that may cause.
In a preferred embodiment of the present application, the refrigeration machine is Stirling cycle refrigerator, is fixed on ring flange cold
5 inner wall of Dewar container for liquefied nitrogen tank, Stirling cycle refrigerator is by nitrogen pressurization, the cooling liquid in overfreezing liquid nitrogen Dewar tank 5, by dividing
It obtains liquid nitrogen from tower to be stored in overfreezing liquid nitrogen Dewar tank 5, then low temperature liquid nitrogen pump 3 extracts liquid nitrogen and follows liquid nitrogen by pipeline
Ring makes the temperature of superconducting current-limiting unit be in normal working temperature into superconductive current limiter ontology 2.
Because superconductive system moment, which quenches, under loading condition can generate amount of heat, liquid nitrogen is caused to volatilize, volume is swollen rapidly
It is swollen, it need to consider over-voltage security protection.Mainly there are three security protections, first is that low-temperature (low temperature) vessel pressure nargin and welding procedure are stringent
Implement according to cryogenic vacuum container standard.Second aspect be operation process control protection, control manufacturing process in deformation because
Element carries out qualification of welding procedure according to standard, carries out the supervision and check of technical process.The third aspect is overvoltage protection, includes peace
Full valve safeguard procedures make nitrogen be directly discharged to atmospheric environment through over-pressure safety device-atmosphere path of releasing.
Sensor module 9, the biography are set in liquid nitrogen storage tank 1, superconductive current limiter ontology 2 and overfreezing liquid nitrogen Dewar tank 5
Sensor component 9 includes temperature sensor, pressure sensor and liquid level sensor, and PT100 thermal resistance can be used in temperature sensor
Low-temperature film pressure sensor can be used in sensor, pressure sensor, and capacitance type sensor can be used in liquid level sensor, uses
The liquid nitrogen temperature, pressure, liquid level of superconductive current limiter ontology 2, liquid nitrogen storage tank 1 and overfreezing liquid nitrogen when detecting superconductive current limiter operation
The liquid level of liquid nitrogen in Dewar tank 5.
The lead of each sensor anti-interference electric wire strong using insulation performance, acquisition data are connected to reality by deconcentrator 11
When data preprocessing module 12, the real time data preprocessing module 12 by the analog signal acquired from sensor module 9 convert
Monitoring host 7 is uploaded at digital signal.
Fault pre-alarming scheme is broadly divided into two parts: steady-state operation early warning and current limliting run early warning.
During steady-state operation, i.e., when current limiter ontology both end voltage is 0, liquid nitrogen in superconductive current limiter ontology 2
The level value needs of temperature value, pressure value, level value, liquid nitrogen storage tank 1 and liquid nitrogen in overfreezing liquid nitrogen Dewar tank 5 are maintained to be set in advance
Within the scope of setting, if any monitoring parameter exceeds early warning range, monitoring host computer 7 issues early warning, and takes and centainly arrange
It applies.The present invention sets stable state warning data range by taking 160kV superconductive current limiter as an example, and sets maintenance scheme, such as superconduction
Liquid nitrogen level value is too low in current limiter ontology, and the liquid nitrogen in liquid nitrogen storage tank will be sent to superconductive current limiter.
Superconducting tape damage, refrigeration system exception, power grid over current fault and four kinds of states of normal current limliting are respectively carried out 20 times
Sample training, the temperature of band in each superconductive current limiter ontology is calculated according to formula, while recording band temperature peak, band
Current limiter ontology both end voltage value, liquid nitrogen pressure value, level value when temperature reaches peak value, liquid nitrogen storage tank, overfreezing liquid nitrogen Dewar tank
In level value, be input to BP neural network model training.During the operation of practical current limliting, i.e., current limiter ontology both ends are electric
When pressure is not 0, monitor value is real-time transmitted to monitoring host computer, output valve is obtained by BP neural network model, it is defeated with step 6
Value compares out, judges current limiter state, carries out trouble hunting.
The invention also discloses a kind of superconductive current limiter state monitoring method based on aforementioned monitoring system, feature exists
In, the state monitoring method the following steps are included:
Step 1: the sensor module by the way that superconductive current limiter ontology is arranged in obtains the voltage value at superconductive current limiter both ends,
Temperature signal, pressure signal and the level value of liquid nitrogen, by the way that liquid nitrogen storage tank is arranged in, the level sensing in overfreezing liquid nitrogen Dewar tank
The liquid nitrogen level value of device acquisition liquid nitrogen storage tank and overfreezing liquid nitrogen Dewar tank；
Step 2: when superconductive current limiter ontology enters operating status, by step 1 sensor module measurement voltage signal,
Temperature signal, liquid nitrogen pressure signal and level value are uploaded to monitoring after real time data preprocessing module carries out analog-to-digital conversion again
Host；
Step 3: when record steady-state operation, i.e., when current limiter ontology both end voltage is 0, the temperature of ontology liquid nitrogen, pressure with
The range of level value, the level value range in liquid nitrogen storage tank, overfreezing liquid nitrogen Dewar tank is as stable state early warning range；
Step 4: in monitoring host computer, the temperature based on heat convection and heat flow density formula estimation superconducting current-limiting unit band
T is spent, steps are as follows:
Wherein, c is the specific heat capacity of liquid nitrogen, and d is sensor at a distance from band, T1For the initial temperature of liquid nitrogen, T2For liquid nitrogen
Temperature when measurement, t T1To T2Time, k is thermal coefficient；
Step 5: to superconducting tape damage, refrigeration system is abnormal, power grid over current fault and four kinds of states of normal current limliting respectively into
Row 20 times measurements, according to the calculation formula of step 3, calculate the temperature of band in each superconductive current limiter ontology, while record paper
Material temperature peak, current limiter ontology both end voltage value, liquid nitrogen pressure value, level value when strip temperature reaches peak value, liquid nitrogen storage tank,
Level value in overfreezing liquid nitrogen Dewar tank；
Step 6: by the strip temperature peak value in step 4, current limiter both end voltage value, liquid nitrogen pressure value, level value, liquid nitrogen
Level value this six characteristic values in storage tank, overfreezing liquid nitrogen Dewar tank are input to BP neural network model training, and output vector can
It is expressed as
Wherein: xi(i=1,2 ..., 6) is input feature vector value；wi, θ respectively indicate connection weight, threshold value, by random number letter
Number generates, and the range of value can be wanted in the training process according to output error adjust automatically with reaching output between [- 1,1]
It asks；f(Ii) indicate transmission function, S type logarithmic function is used here.
Step 7: in steady-state operation, i.e., when current limiter ontology both end voltage is 0, any monitor value is not in stable state early warning value
When in range, start early warning program；In limited current state, i.e., when current limiter ontology both end voltage is not 0, monitor value is passed in real time
It is defeated to arrive monitoring host computer, output valve is obtained by BP neural network model, is compared with the output valve of step 6, judges current limiter
State.
Applicant combines Figure of description to be described in detail and describe the embodiment of the present invention, but this field skill
Art personnel are it should be understood that above embodiments are only the preferred embodiments of the invention, and explanation is intended merely to help reader in detail
More fully understand spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, any based on invention essence of the invention
Any improvement or modification made by mind should all be fallen within the scope and spirit of the invention.
Claims (7)
1. a kind of superconductive current limiter condition monitoring system, including superconductive current limiter ontology, liquid nitrogen storage tank, cryogenic refrigerating system, row
Liquid mouth, sensor module, deconcentrator, real time data preprocessing module and monitoring host computer；It is characterized by:
The liquid nitrogen storage tank is connected by pipeline with superconductive current limiter ontology, provides required liquid nitrogen for superconductive current limiter ontology；
In the lower part of superconductive current limiter ontology, leakage fluid dram is set；
Cryogenic refrigerating system is set on the top of superconductive current limiter ontology, for cooling down the liquid nitrogen temperature in superconductive current limiter ontology
Degree；
Sensor module, the sensor module are set in liquid nitrogen storage tank, superconductive current limiter ontology and overfreezing liquid nitrogen Dewar tank
Including voltage sensor, temperature sensor, pressure sensor and liquid level sensor, superconductive current limiter ontology when for detecting operation
Both end voltage, the temperature of liquid nitrogen, pressure, liquid level, the liquid level of liquid nitrogen in liquid nitrogen storage tank and overfreezing liquid nitrogen Dewar tank；
The acquisition data output end of each sensor is connected to real time data preprocessing module by deconcentrator, and the real time data is pre-
The analog signal acquired from sensor module is converted into digital signal and is uploaded to monitoring host computer by processing module；
During steady-state operation, the both end voltage of superconductive current limiter ontology, strip temperature value, pressure value, the liquid level of liquid nitrogen
Within the scope of the level value of liquid nitrogen needs to be maintained at pre-set in value, liquid nitrogen storage tank and overfreezing liquid nitrogen Dewar tank, if
Any monitoring parameter exceeds early warning range, then monitoring host computer issues early warning, and takes corresponding relay protection measure.
2. superconductive current limiter condition monitoring system according to claim 1, it is characterised in that:
The leakage fluid dram disposes Remote control valve door switch, when liquid nitrogen level is more than early warning liquid level, prison in superconductive current limiter ontology
It controls host and issues valve opening signal, valve is closed when liquid level drops to safety level.
3. superconductive current limiter condition monitoring system according to claim 2, it is characterised in that:
The leakage fluid dram uses steel flange gate valve, and the external world is discharged in liquid nitrogen excessive in superconductive current limiter ontology, makes superconduction
Liquid nitrogen level is in a safety levels section always in current limiter ontology.
4. superconductive current limiter condition monitoring system according to claim 1 or 2, it is characterised in that:
The cryogenic refrigerating system includes that low temperature liquid nitrogen pump, refrigeration machine and overfreezing liquid nitrogen Dewar tank, one end of refrigeration machine pass through pipe
Road is connected to superconductive current limiter ontology, and the other end is connected to overfreezing liquid nitrogen Dewar tank by pipeline, and low temperature liquid nitrogen pump is from supercooled liquid
Nitrogen Dewar tank extracts liquid nitrogen, and liquid nitrogen is pressed into superconductive current limiter ontology by pipeline, and overfreezing liquid nitrogen Dewar tank passes through exhaust outlet
It is connected with air, exhaust outlet is equipped with safety valve, the valve opening when supercooling Dewar container for liquefied nitrogen pressure inside the tank, which is higher than, lets out nitrogen valve setting value.
5. superconductive current limiter condition monitoring system according to claim 4, it is characterised in that:
The refrigeration machine is Stirling cycle refrigerator, is fixed on cold Dewar container for liquefied nitrogen top tank structure, Stirling cycle system with ring flange
Nitrogen pressurization, cooling liquid in overfreezing liquid nitrogen Dewar tank is obtained liquid nitrogen by knockout tower and is stored in overfreezing liquid nitrogen Du by cold
In crock, then low temperature liquid nitrogen pump extracts liquid nitrogen and liquid nitrogen is recycled in superconductive current limiter ontology by pipeline, limits superconduction
The temperature of stream unit is in normal working temperature.
6. the superconductive current limiter condition monitoring system according to claim 3 or 5, it is characterised in that:
The exhaust outlet is let out nitrogen valve using internal feedback structure, is let out when supercooling Dewar container for liquefied nitrogen tank internal pressure is higher than equipped with nitrogen valve is let out
Nitrogen valve setting value, spool move up opening valve, nitrogen of outwardly releasing；When tank internal pressure is down to setting value, closing valve.
7. a kind of superconductive current limiter state monitoring method based on monitoring system described in claim 1-6, which is characterized in that institute
State state monitoring method the following steps are included:
Step 1: the sensor module by the way that superconductive current limiter ontology is arranged in obtains the voltage value at superconductive current limiter both ends, liquid nitrogen
Temperature signal, pressure signal and level value, by the way that liquid nitrogen storage tank is arranged in, the liquid level sensor in overfreezing liquid nitrogen Dewar tank obtains
Obtain the liquid nitrogen level value of liquid nitrogen storage tank and overfreezing liquid nitrogen Dewar tank；
Step 2: when superconductive current limiter ontology enters operating status, by the voltage signal of step 1 sensor module measurement, temperature
Signal, liquid nitrogen pressure signal and level value are uploaded to monitoring host computer after real time data preprocessing module carries out analog-to-digital conversion again；
Step 3: when record steady-state operation, i.e., when current limiter ontology both end voltage is 0, temperature, pressure and the liquid level of ontology liquid nitrogen
The range of value, the level value range in liquid nitrogen storage tank, overfreezing liquid nitrogen Dewar tank is as stable state early warning range；
Step 4: in monitoring host computer, the temperature T based on heat convection and heat flow density formula estimation superconducting current-limiting unit band,
Steps are as follows:
Wherein, c is the specific heat capacity of liquid nitrogen, and d is sensor at a distance from band, T1For the initial temperature of liquid nitrogen, T2For liquid nitrogen measurement
When temperature, t T1To T2Time, k is thermal coefficient；
Step 5: to the superconduction under superconducting tape damage, refrigeration system exception, power grid over current fault and four kinds of states of normal current limliting
The voltage value at current limiter both ends, temperature signal, pressure signal and the level value and liquid nitrogen storage tank and overfreezing liquid nitrogen Dewar of liquid nitrogen
The liquid nitrogen level value of tank respectively carries out 20 measurements, according to the calculation formula of step 4, calculates band in each superconductive current limiter ontology
Temperature, while recording band temperature peak, current limiter ontology both end voltage value, liquid nitrogen pressure when strip temperature reaches peak value
It is worth, level value, the level value in liquid nitrogen storage tank, overfreezing liquid nitrogen Dewar tank；
Step 6: the strip temperature peak value that step 5 is calculated, current limiter both end voltage value, liquid nitrogen pressure value, level value, liquid
Level value this six characteristic values in nitrogen storage tank, overfreezing liquid nitrogen Dewar tank are input to BP neural network model training, output vector
It is represented by
Wherein: xi(i=1,2 ..., 6) is input feature vector value；wi, θ respectively indicate connection weight, threshold value, produced by random number functions
Raw, the range of connection weight and threshold value can require automatic adjust between [- 1,1] according to setting output error in the training process
It is whole；f(Ii) indicate transmission function, using S type logarithmic function；
Step 7: in steady-state operation, i.e., when current limiter ontology both end voltage is 0, any monitor value is not in stable state early warning value range
When interior, start early warning program；In limited current state, i.e., when current limiter ontology both end voltage is not 0, monitor value is real-time transmitted to
Monitoring host computer obtains output valve by BP neural network model, compares with the output valve of step 6, judges current limiter state.
Priority Applications (1)
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