CN108680889A - The method and system of all-fiber current transformator accuracy under a kind of low temperature electromagnetic interference - Google Patents
The method and system of all-fiber current transformator accuracy under a kind of low temperature electromagnetic interference Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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Abstract
The invention discloses all-fiber current transformator accuracy test method under a kind of low temperature electromagnetic interference failure, the method includes：All-fiber current transformator is placed in certain circumstances, the temperature of the specific environment is dropped into N degree by M degree within a preset period of time；The normalized current of identical parameter preset is inputted to all-fiber current transformator and standard current transformer in the preset time；The standard output electric current of all -fiber output current of the all-fiber current transformator and standard current transformer is acquired in real time；The corresponding real-time criteria output current of all -fiber output current acquired in real time is compared, real-time accuracy is exported；Electromagnetic interference is carried out to the all-fiber current transformator within a preset period of time, confirms real-time accuracy situation of change；The electromagnetic interference is only run under the specific environment, and the specific environment has electromagnetic shielding action so that the device other than specific environment is not by electromagnetic interference.
Description
Technical field
The present invention relates to field of power electronics, more particularly, to full optical-fiber current mutual inductance under a kind of low temperature electromagnetic interference
The method and system of device accuracy.
Background technology
Traditional oil immersion type mutual-inductor is to carry out adopting for voltage and current signal using oil-insulation, using electromagnetic induction theorem
Collection and transmission, capacitance and dielectric dissipation factor are to reflect the important parameter of itself insulation characterisitic.It is tried at present by electrical equipment
The regulation (it is required that carrying out at 5 DEG C) for testing environmental condition, does not carry out the insulation characterisitic experiment less than 5 DEG C, for high and cold low
The equipment of warm area operation, the operation data under low temperature is less, cannot meet high and cold low-temperature construction and put into operation and equipment operation
The requirement of condition diagnosing.Electronic mutual inductor is that current and voltage signals are converted into optical information to be transferred to secondary set by optical fiber
The novel mutual inductor of standby one kind needs to use a large amount of optical device although its insulation system greatly simplifies.Due to big
Partial optical device is very sensitive for the reacting condition of temperature, and the correlated performance of electronic mutual inductor obtains under high and cold low-temperature characteristics
Less than guarantee.All-fiber current transformator is one of the highest level that optical current mutual inductor is developed so far, largely at present
Applied in extra-high voltage direct-current engineering and all kinds of intelligent substations, all-fiber current transformator uses a large amount of optical sensor
Part, influence of the high and cold low temperature environment to its primary transducer (sensing ring) and Transmission Fibers component is very big, and electromagnetism is dry in addition
Disturb generation so that sensor accuracy is affected, and under high and cold low temperature environment all-fiber current sensor to electromagnetic interference
Under whether can accurately respond and can not confirm under the prior art, this throwing to all-fiber current transformator under high and cold low temperature environment
Enter to increase risk.
Invention content
In order to solve that low temperature and electromagnetic interference failure can not be prejudged under high and cold low temperature environment existing for background technology
The problem of influence to all-fiber current transformator accuracy, the present invention provides all -fibers under a kind of low temperature electromagnetic interference failure
The method and system of Accuracy Class of Current Transformer；The method and system are confirmed by the environment of simulation low temperature and electromagnetic interference
The accuracy of all-fiber current transformator to be measured at any time, the influence situation of temperature change and electromagnetic interference failure, with confirm should
The applicable temperature range of all-fiber current transformator simultaneously obtains the reference for subsequently carrying out accuracy error compensation at low ambient temperatures
Foundation；All-fiber current transformator accuracy test method includes under a kind of low temperature electromagnetic interference failure：
All-fiber current transformator is placed in certain circumstances, within a preset period of time by the temperature of the specific environment
N degree is dropped to by M degree；
In the preset time identical default ginseng is inputted to all-fiber current transformator and standard current transformer
Several normalized currents；
It is defeated to the standard of all -fiber output current of the all-fiber current transformator and standard current transformer in real time
Go out electric current to be acquired；
The corresponding real-time criteria output current of all -fiber output current acquired in real time is compared, is exported
Real-time accuracy；
Electromagnetic interference is carried out to the all-fiber current transformator within a preset period of time, and confirms that real-time accuracy becomes
Change situation；The electromagnetic interference only carries out under the specific environment, and the specific environment has electromagnetic shielding action so that
Appliance arrangement other than specific environment is not by electromagnetic interference；
Further, when specific environment reaches preset temperature, electromagnetic interference behaviour is carried out to all-fiber current transformator
Make；The electromagnetic interference include in specific environment by preset rules be arranged the intensity of electromagnetic interference, harmonic wave forms and with
The relative position of all-fiber current transformator；The preset temperature can be multiple；
Further, electromagnetic interference operation is carried out to the all-fiber current transformator in the preset time period, and
After confirming real-time accuracy situation of change, the method further includes：
If the value of accuracy is more than preset accuracy threshold value, primary alarm is recorded, and stop electromagnetic interference, restores to survey
Examination；
If the value of the accuracy is less than preset accuracy threshold value during electromagnetic interference operates, record is primary different
Often；
Further, the temperature for acquiring the all-fiber current transformator local environment in real time, according to it is corresponding real-time when
Between matching temperature and accuracy, confirm influence of the temperature to accuracy；
Further, it according to the accuracy of confirmation, temperature and the situation of change under corresponding electromagnetic interference, determines tested complete
The low temperature scope of application of optical fiber current mutual inductor；
Cryogenic box, the cryogenic box include temperature adjustment module, and the cryogenic box is for putting all-fiber current transformator
It sets inside it, and the temperature in cryogenic box is adjusted by the temperature adjustment module；The temperature adjustment module is used for pre-
If period in the temperature in cryogenic box dropped into N degree by M degree；
Normalized current source, the normalized current source are used to provide mark to all-fiber current transformator and standard current transformer
Quasi- electric current；The normalized current is determined by parameter preset；
Current acquisition unit, the current acquisition unit is for defeated to all -fiber of the all-fiber current transformator in real time
The standard output electric current for going out electric current and standard current transformer is acquired；
Mutual inductor corrects unit, mutual inductor correction unit be used for by all -fiber output current acquired in real time with
Its corresponding real-time criteria output current is compared, and real-time accuracy is exported；
Electromagnetic interference unit, the electronic interferences unit are used within a preset period of time to the all-fiber current transformator
Carry out electromagnetic interference；
The electromagnetic interference unit is set to inside cryogenic box, confirms electromagnetic interference unit and all -fiber electricity by preset rules
Relative position between current transformer；The cryogenic box has electromagnetic shielding action to ensure that cryogenic box external environment is dry not by electromagnetism
Disturb influence；
Further, the electromagnetic interference unit is used for when specific environment reaches preset temperature, mutual to full optical-fiber current
Sensor carries out electromagnetic interference；Intensity, the harmonic wave forms of electromagnetic interference source are arranged according to preset rules for the electromagnetic interference；It is described pre-
If temperature can be multiple；
Further, the system comprises control units；
In the case that in electromagnetic interference, the value of accuracy is more than preset accuracy threshold value, described control unit is for remembering
The primary alarm of record, and control electromagnetic interference unit and stop electromagnetic interference operation, restore test；
In the case that the value of the accuracy is less than preset accuracy threshold value during electromagnetic interference acts on, the control
Unit processed is for recording primary exception；
Further, the system comprises information process unit, the cryogenic box includes temperature sensor；The temperature passes
Sensor is used to acquire the temperature of the cryogenic box in real time；Described information processing unit is used to receive the temperature of temperature sensor acquisition
And the accuracy of mutual inductor correction unit output, and the temperature and accuracy are matched by real-time time；
Described information processing unit is according to temperature, accuracy and the electromagnetic interference situation under real-time time, by default rule
Then determine the low temperature scope of application of tested all-fiber current transformator.
Beneficial effects of the present invention are：Technical scheme of the present invention gives all -fiber electricity under a kind of low temperature electromagnetic interference
By simulating the environment of low temperature and electromagnetic interference, confirmation waits for for the method and system of current transformer accuracy, the method and system
Survey all-fiber current transformator accuracy at any time, the influence situation of temperature change and electromagnetic interference, to confirm all -fiber
The applicable temperature range of current transformer simultaneously obtains the reference frame for subsequently carrying out accuracy error compensation at low ambient temperatures.
Description of the drawings
By reference to the following drawings, exemplary embodiments of the present invention can be more fully understood by：
Fig. 1 be the specific embodiment of the invention a kind of low temperature electromagnetic interference under all-fiber current transformator accuracy side
The flow chart of method；
Fig. 2 be the specific embodiment of the invention a kind of low temperature electromagnetic interference under all-fiber current transformator accuracy be
The structure chart of system.
Specific implementation mode
Exemplary embodiments of the present invention are introduced referring now to the drawings, however, the present invention can use many different shapes
Formula is implemented, and is not limited to the embodiment described herein, and to provide these embodiments be to disclose at large and fully
The present invention, and fully convey the scope of the present invention to person of ordinary skill in the field.Show for what is be illustrated in the accompanying drawings
Term in example property embodiment is not limitation of the invention.In the accompanying drawings, identical cells/elements use identical attached
Icon is remembered.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has person of ordinary skill in the field
It is common to understand meaning.Further it will be understood that with the term that usually used dictionary limits, should be understood as and its
The context of related field has consistent meaning, and is not construed as Utopian or too formal meaning.
Fig. 1 is all-fiber current transformator accuracy under a kind of low temperature electromagnetic interference failure of the specific embodiment of the invention
Method flow chart；As shown in Figure 1, environment of the method by simulation low temperature and electromagnetic interference failure, confirms to be measured complete
The accuracy of optical fiber current mutual inductor at any time, the influence situation of temperature change and electromagnetic interference failure, to confirm all -fiber
The applicable temperature range of current transformer simultaneously obtains the reference frame for subsequently carrying out accuracy error compensation at low ambient temperatures；Institute
The method of stating includes：
Step 110, all-fiber current transformator is placed in certain circumstances, by the temperature of the specific environment default
N degree is dropped to by M degree in period；
Further, to verify the accuracy of the performance of the all-fiber current transformator at low temperature, need to will it is described entirely
Optical fiber current mutual inductor is placed in the environment of low temperature, and such as entire verification system is placed under low temperature, except full optical-fiber current is mutual
The other component of sensor can also be influenced by low temperature environment so that its performance there are unknown variations risks so that whole system test
As a result unreliable；Therefore need the all-fiber current transformator being separately positioned under a specific environment, the specific environment
Internal temperature is adjustable, is isolated with the temperature of the environmental externality, while the input/output of the all-fiber current transformator connects
Wiring may extend into the outside of specific environment, is attached with external system and device or module；
Further, the specific environment can be a cryogenic box that can accommodate all-fiber current transformator, the case
Body is closed, and the input and output connecting line of the all-fiber current transformator passes through babinet to outer under the premise of ensureing that babinet is closed
Portion's environment；
Further, temperature can be adjusted in the specific environment, and the method for the adjusting includes setting certain time
Temperature is set to be changed according to preset rules in section, because of the characteristic of temperature, the variation is continuous and non-discrete, described pre-
If rule can be the mathematical function about temperature and time could be provided as once linear letter by taking most basic function as an example
Number so that temperature is according to time even variation；By taking the present embodiment as an example, it is one hour that preset time, which can be arranged, keeps all -fiber electric
The temperature of specific environment residing for current transformer drops to -60 degree by 0 degree；
Step 120, same to all-fiber current transformator and standard current transformer the input phase in the preset time
Parameter preset normalized current；
The standard current transformer is for use as standard to confirm all-fiber current transformator；Pass through such as standard electric
The normalized current in stream source provides all-fiber current transformator described in direction and standard current transformer input synchronization, amplitude phase
Same, the identical normalized current of phase；Meanwhile to ensure the synchronism of input, the standard current transformer and the full light
Fiber current mutual inductor can be arranged symmetrically relative to reference clock；
Step 130, in real time to all -fiber output current and standard current transformer of the all-fiber current transformator
Standard output electric current be acquired；
It is mutual to all -fiber output current and normalized current of all-fiber current transformator simultaneously using signal pickup assembly
The standard output electric current of sensor is acquired, and time record is arranged on the signal pickup assembly, to obtain synchronous acquisition
As a result；The signal pickup assembly can be a variety of oscillographs that can carry out current signal acquisition, it is preferred that the oscillograph
With double acquisition channels so that the synchronous acquisition, which has, more accurately to be ensured；
Step 140, the corresponding real-time criteria output current of all -fiber output current acquired in real time is carried out
Comparison, exports real-time accuracy；
The all -fiber output current and real-time criteria output current that acquisition is obtained carry out accuracy according to synchronization time
Calculation processing obtains the accuracy numerical value changed along time shaft；
Further, the temperature for acquiring the all-fiber current transformator local environment in real time, according to it is corresponding real-time when
Between matching temperature and accuracy, confirm influence of the temperature to accuracy；
Temperature is matched according to time shaft with accuracy according to the variation relation of temperature and time, obtains all -fiber
The rule that Accuracy Class of Current Transformer varies with temperature；
Further, temperature accuracy threshold value can be set, you can the waving interval that the accuracy of receiving varies with temperature；When
When accuracy exceeds threshold value at a certain temperature, which is not suitable for using at this temperature；
Step 150, electromagnetic interference is carried out to the all-fiber current transformator within a preset period of time, and confirmed real-time
Accuracy situation of change；The electromagnetic interference only carries out under the specific environment, and there is the specific environment electromagnetic shielding to make
With so that the appliance arrangement other than specific environment is not by electromagnetic interference；
Further, when specific environment reaches preset temperature, electromagnetic interference behaviour is carried out to all-fiber current transformator
Make；The electromagnetic interference include in specific environment by preset rules be arranged the intensity of electromagnetic interference, harmonic wave forms and with
The relative position of all-fiber current transformator；The preset temperature can be multiple；
There are many realization methods of the electromagnetic interference, by taking the present embodiment as an example, it is preferable to use real in the way of radiation coupling
Existing electromagnetic interference, realizes that the interference source of electromagnetic interference can select radio transition equipment or AC network magnetic field etc. may be implemented
The equipment of electromagnetic interference, while by realizing that electromagnetic interference equipment is controlled and set, completing varying strength and different type
Electric jamming；
Further, it is contemplated that high and cold low temperature can impact electromagnetic interference equipment, and can adjust cryogenic box is non-electromagnetism
Then shielded box is being arranged an electromagnetic shielding box outside entire cryogenic box, the electromagnetic interference device is positioned over electromagnetism
Between shielded box and cryogenic box, while this makes electromagnetic interference device not influenced by the high and cold low temperature of cryogenic box, it ensure that
Electromagnetic interference will not impact other equipment.
Further, electromagnetic interference accuracy threshold value is set, if the value of accuracy is more than preset accuracy threshold value, is remembered
The primary alarm of record, and stop electromagnetic interference, restore test；If the value of the accuracy is less than default during electromagnetic interference operates
Accuracy threshold value, then record is primary abnormal；
If the all-fiber current transformator is in normal circumstances, electromagnetic interference such as occurs, is bound to influence mutual inductor
Such as there is loss in performance, this makes accuracy be bound to change during mutual inductance, that is, be bound to be more than preset accurate
Threshold value is spent, if at low ambient temperatures, electromagnetic interference failure still results in accuracy anomalous variation, i.e. accuracy under low temperature environment
It still can be with sensitive quick reaction；If the value of accuracy is more than never preset accuracy threshold value during electromagnetic interference,
It is abnormal conditions instead；
Further, according to the accuracy of confirmation, temperature and the situation of change under corresponding electromagnetic interference operation, quilt is determined
Survey the low temperature scope of application of all-fiber current transformator；
It, at low temperatures can according to whether accuracy is more than low temperature accuracy threshold value selection by taking the present embodiment as an example
To be tested the temperature range 1 that all-fiber current transformator can be run；Electromagnetic interference operation is carried out at multiple temperatures, according to standard
Exactness whether the temperature range 2 that can be run in the tested all-fiber current transformator of low temperature electromagnetic interference alarm selection；Again
Temperature range 1 and temperature range 2 are taken to the low temperature scope of application of the tested all-fiber current transformator of intersection confirmation；
Further, a narrower section can be also obtained by temperature range 1, and selection is multiple in temperature range 1
Temperature carries out electromagnetic interference operation；
Fig. 2 be the specific embodiment of the invention a kind of low temperature electromagnetic interference under all-fiber current transformator accuracy be
The structure chart of system, as shown in Fig. 2, the system comprises：
Cryogenic box 201, the cryogenic box 201 include temperature adjustment module, and the cryogenic box 201 is used for full optical-fiber current
Mutual inductor is placed inside it, and adjusts the temperature in cryogenic box 201 by the temperature adjustment module；The temperature adjusts mould
Block by M degree by the temperature in cryogenic box 201 within the preset period for dropping to N degree；
Further, the preset time period that the temperature adjustment module is arranged is 1 hour, and the temperature adjustment module is pre-
If the temperature of cryogenic box 201 is dropped to -60 degree by 0 degree in the period；
For being originally embodiment, the temperature adjustment module includes refrigeration compressor, for according to temperature adjustment instructions
To being freezed or being restored inside cryogenic box 201, this part is known technology, is not repeated；
The babinet of the cryogenic box 201 is closed, and the input and output connecting line of the all-fiber current transformator is in guard box
Pass through babinet to external environment under the premise of body is closed；
Normalized current source 202, the normalized current source 202 are used for all-fiber current transformator and standard current transformer
Normalized current is provided；The normalized current is determined by parameter preset；
Current acquisition unit 203, the current acquisition unit 203 are used in real time to the complete of the all-fiber current transformator
The standard output electric current of optical fiber output electric current and standard current transformer is acquired；
The current acquisition unit 203, which can use, has twin-channel oscillograph；
Mutual inductor corrects unit 204, and the mutual inductor correction unit 204 is used to export all -fiber acquired in real time
The corresponding real-time criteria output current of electric current is compared, and real-time accuracy is exported；
Electromagnetic interference unit 205, the electronic interferences unit is for mutual to the full optical-fiber current within a preset period of time
Sensor carries out electromagnetic interference；
Realize electromagnetic interference electromagnetic interference unit 205 include electromagnetic interference source, can select radio transition equipment or
The equipment that electromagnetic interference may be implemented in AC network magnetic field etc., while by being controlled and set to realization electromagnetic interference equipment,
Complete varying strength and different types of electric jamming；
The electromagnetic interference unit 205 is set to inside cryogenic box, by preset rules confirmation electromagnetic interference unit 205 and entirely
Relative position between optical fiber current mutual inductor；The cryogenic box have electromagnetic shielding action with ensure cryogenic box external environment not by
Electromagnetic interference influence；
Further, it is contemplated that high and cold low temperature can impact electromagnetic interference equipment, and can adjust cryogenic box is non-electromagnetism
Then shielded box is being arranged an electromagnetic shielding box outside entire cryogenic box, the electromagnetic interference unit 205 is positioned over electricity
Between magnetic screen case and cryogenic box, while this makes electromagnetic interference unit 205 not influenced by the high and cold low temperature of cryogenic box, protect
Other equipment will not be impacted by having demonstrate,proved electromagnetic interference.
Further, the electromagnetic interference unit 205 is used for when specific environment reaches preset temperature, to full optical-fiber current
Mutual inductor carries out electromagnetic interference；Intensity, the harmonic wave forms of electromagnetic interference source are arranged according to preset rules for the electromagnetic interference；It is described
Preset temperature can be multiple；
Further, the system comprises control units；
In the case that in electromagnetic interference, the value of accuracy is more than preset accuracy threshold value, described control unit is for remembering
The primary alarm of record, and control electromagnetic interference unit 205 and stop electromagnetic interference operation, restore test；
In the case that the value of the accuracy is less than preset accuracy threshold value during electromagnetic interference acts on, the control
Unit processed is for recording primary exception；
Further, the system comprises information process unit, the cryogenic box includes temperature sensor；The temperature passes
Sensor is used to acquire the temperature of the cryogenic box in real time；Described information processing unit is used to receive the temperature of temperature sensor acquisition
And the accuracy of mutual inductor correction unit output, and the temperature and accuracy are matched by real-time time；
Described information processing unit is according to temperature, accuracy and the electromagnetic interference situation under real-time time, by default rule
Then determine the low temperature scope of application of tested all-fiber current transformator.
In the instructions provided here, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the disclosure
Example can be put into practice without these specific details.In some instances, well known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Those skilled in the art, which are appreciated that, to carry out adaptively the module in the equipment in embodiment
Change and they are arranged in the one or more equipment different from the embodiment.It can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.Other than such feature and/or at least some of process or unit exclude each other, it may be used any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, abstract and attached drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit requires, abstract and attached drawing) disclosed in each feature can be by providing the alternative features of identical, equivalent or similar purpose come generation
It replaces.Involved in this specification to the step of number be only used for distinguishing each step, and time being not limited between each step
Or the relationship of logic, restriction unless the context clearly, otherwise the relationship between each step includes various possible situations.
In addition, it will be appreciated by those of skill in the art that although some embodiments described herein include other embodiments
In included certain features rather than other feature, but the combination of the feature of different embodiments means to be in the disclosure
Within the scope of and form different embodiments.For example, embodiment claimed in detail in the claims is one of arbitrary
It mode can use in any combination.
The all parts embodiment of the disclosure can be with hardware realization, or to run on one or more processors
Software module realize, or realized with combination thereof.The disclosure is also implemented as executing side as described herein
Some or all equipment or system program (for example, computer program and computer program product) of method.It is such
Realize that the program of the disclosure can may be stored on the computer-readable medium, or can be with the shape of one or more signal
Formula.Such signal can be downloaded from internet website and be obtained, and either be provided on carrier signal or with any other shape
Formula provides.
The disclosure is limited it should be noted that above-described embodiment illustrates rather than the disclosure, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.Word "comprising" is not arranged
Except there are element or steps not listed in the claims.Word "a" or "an" before element does not exclude the presence of more
A such element.The disclosure can be by means of including the hardware of several different elements and by means of properly programmed calculating
Machine is realized.If in the unit claim for listing dry systems, several in these systems can be by same
Hardware branch embodies.
The above is only the specific implementation mode of the disclosure, it is noted that for the ordinary skill people of this field
Member for, under the premise of not departing from disclosure spirit, can make several improvements, change and deform, these improve, modification,
It is regarded as falling within the scope of protection of this application with deformation.
Claims (10)
1. all-fiber current transformator accuracy test method under a kind of low temperature electromagnetic interference failure, the method includes：
All-fiber current transformator is placed in certain circumstances, by the temperature of the specific environment within a preset period of time by M
Degree drops to N degree；
In the preset time identical parameter preset is inputted to all-fiber current transformator and standard current transformer
Normalized current；
In real time to the standard output electricity of all -fiber output current of the all-fiber current transformator and standard current transformer
Stream is acquired；
The corresponding real-time criteria output current of all -fiber output current acquired in real time is compared, output is real-time
Accuracy；
Electromagnetic interference is carried out to the all-fiber current transformator within a preset period of time, and confirms real-time accuracy variation feelings
Condition；The electromagnetic interference only carries out under the specific environment, and the specific environment has electromagnetic shielding action so that specific
Appliance arrangement other than environment is not by electromagnetic interference.
2. according to the method described in claim 1, it is characterized in that：It is mutual to the full optical-fiber current in the preset time period
Sensor carries out electromagnetic interference：
When specific environment reaches preset temperature, electromagnetic interference operation is carried out to all-fiber current transformator；The electromagnetism is dry
Disturb including in specific environment by preset rules be arranged the intensity of electromagnetic interference, harmonic wave forms and with full optical-fiber current mutual inductance
The relative position of device；The preset temperature can be multiple.
3. according to the method described in claim 1, it is characterized in that：It is mutual to the full optical-fiber current in the preset time period
Sensor carries out electromagnetic interference operation, and after confirming real-time accuracy situation of change, and the method further includes：
If the value of accuracy is more than preset accuracy threshold value, primary alarm is recorded, and stop electromagnetic interference, restore test；
If the value of the accuracy is less than preset accuracy threshold value during electromagnetic interference operates, record primary abnormal.
4. according to the method described in claim 1, it is characterized in that：The all-fiber current transformator local environment is acquired in real time
Temperature, temperature and accuracy are matched according to corresponding real-time time, confirm influence of the temperature to accuracy.
5. according to the method described in claim 4, it is characterized in that, the method further includes：According to the accuracy of confirmation, temperature
And the situation of change under corresponding electromagnetic interference, determine the low temperature scope of application of tested all-fiber current transformator.
6. system is tested in all-fiber current transformator accuracy under a kind of low temperature electromagnetic interference, the system comprises：
Cryogenic box, the cryogenic box include temperature adjustment module, and the cryogenic box is for all-fiber current transformator to be placed on
Inside it, and the temperature in cryogenic box is adjusted by the temperature adjustment module；The temperature adjustment module is used for preset
The temperature in cryogenic box is dropped into N degree by M degree in period；
Normalized current source, the normalized current source are used to provide standard electric to all-fiber current transformator and standard current transformer
Stream；The normalized current is determined by parameter preset；
Current acquisition unit, the current acquisition unit to all -fiber of the all-fiber current transformator for exporting electricity in real time
The standard output electric current of stream and standard current transformer is acquired；
Mutual inductor corrects unit, and the mutual inductor correction unit is used for, and all -fiber output current acquired in real time is right with it
The real-time criteria output current answered is compared, and real-time accuracy is exported；
Electromagnetic interference unit, the electronic interferences unit is within a preset period of time carrying out the all-fiber current transformator
Electromagnetic interference；
The electromagnetic interference unit is set to inside cryogenic box, confirms that electromagnetic interference unit and full optical-fiber current are mutual by preset rules
Relative position between sensor；The cryogenic box has electromagnetic shielding action to ensure cryogenic box external environment not by electromagnetic interference shadow
It rings.
7. system according to claim 6, it is characterised in that：The electromagnetic interference unit is used to reach in specific environment pre-
If when temperature, electromagnetic interference is carried out to all-fiber current transformator；Electromagnetic interference is arranged according to preset rules in the electromagnetic interference
Intensity, the harmonic wave forms in source；The preset temperature can be multiple.
8. system according to claim 6, it is characterised in that：The system comprises control units；
In the case that in electromagnetic interference, the value of accuracy is more than preset accuracy threshold value, described control unit is for recording one
Secondary alarm, and control electromagnetic interference unit and stop electromagnetic interference operation, restore test；
In the case that the value of the accuracy is less than preset accuracy threshold value during electromagnetic interference acts on, the control is single
Member is for recording primary exception.
9. system according to claim 6, it is characterised in that：The system comprises information process unit, the cryogenic box
Including temperature sensor；The temperature sensor is used to acquire the temperature of the cryogenic box in real time；Described information processing unit is used
In the accuracy of the temperature and mutual inductor correction unit output that receive temperature sensor acquisition, and by the temperature and accuracy
It is matched by real-time time.
10. system according to claim 9, it is characterised in that：Described information processing unit is according to the temperature under real-time time
Degree, accuracy and electromagnetic interference situation are determined the low temperature scope of application for being tested all-fiber current transformator by preset rules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595392.9A CN108680889B (en) | 2018-06-11 | 2018-06-11 | Method and system for accuracy of all-fiber current transformer under low-temperature electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810595392.9A CN108680889B (en) | 2018-06-11 | 2018-06-11 | Method and system for accuracy of all-fiber current transformer under low-temperature electromagnetic interference |
Publications (2)
| Publication Number | Publication Date |
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| CN108680889A true CN108680889A (en) | 2018-10-19 |
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| CN114295883A (en) * | 2022-01-06 | 2022-04-08 | 南京大学 | Multi-dimensional calibration method for improving measurement accuracy of optical fiber current sensor |
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