CN108061872A - The test method of remanent magnetism, device, storage medium and processor in current transformer - Google Patents
The test method of remanent magnetism, device, storage medium and processor in current transformer 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 present invention provides test method, device, storage medium and the processor of remanent magnetism in a kind of current transformer, wherein, this method includes：It is demagnetized to measured current transformer and measures the first error of measured current transformer；It adjusts the magnitude of current of DC power supply and the DC current of the magnitude of current is passed through to measured current transformer；In the case where measured current transformer is in steady-state operating condition, the second error of measured current transformer and the current waveform of measured Current Transformer Secondary side are measured；The correspondence for determining to be passed through between the direct current measurement of measured current transformer and the error of measured current transformer according to the magnitude of current of the first error, the second error and DC current.Using above-mentioned technical proposal, solve the problems, such as the less efficient of magnetic remnant research in correlation technique to current transformer, improve the efficiency to the magnetic remnant research of current transformer.
Description
Technical field
The present invention relates to the communications field, in particular to the test method of remanent magnetism in a kind of current transformer, device,
Storage medium and processor.
Background technology
Current transformer is the important component of electric system, and Transfer characteristic influences the accuracy of measurement and protection fills
Put the reliability of action.Due to the hysteresis characteristic of core material, when short circuit occurs for system, primary current increases sharply, maximum reachable
To tens times of specified running current, while there may be bigger DC component in short circuit current, during failure removal, primary side
Current over-zero stops, and will generate larger remanent magnetism in iron core at this time, transient characterisitics that can be to protective current transformer, and metering
The steady-state characteristic of Current Transformer generates harmful effect, and due to excitation current very little when current transformer works normally, it is right
The remanent magnetism generated when short-circuit is substantially without demagnetizing effect, thus the existence time of remanent magnetism can be more than some months, running electricity
Current transformer generally existing remanent magnetism, remanent magnetism will not disappear, once generating by long-term existence under normal running (operation) conditions automatically.Remanent magnetism
Presence changed start work point of the current transformer on excitation curve, aggravated the degree of saturation of iron core and full
And the time, it is the major reason for generating out-of-balance current and causing differential protection malfunction, to relay protection and kilowatt meter volume production
Life seriously affects, and is unfavorable for the safe and stable operation of electric system.Therefore, engineering has been become in practice to iron core magnetic remnant research
Urgent problem to be solved.
At present, in the majority with transformer to the research of remanent magnetism, the research to remanent magnetism in current transformer core is concentrated mainly on
Measurement of residual magnetism and remanent magnetism are online in terms of inhibition.The test method of existing research remanence of current transformer, either direct current method are also
It is alternating current method, saturation will be charged to forward or backwards to current transformer, so destroys the original remanent magnetism of mutual inductor, and
Usually without considering mutual inductor whether saturation in itself, due to the limitation of experimental principle and the shadow of part immeasurability parameter
It rings, causes convenient, efficiently not applying in practice for the research of iron core remanent magnetism at present, and controllable ration can not be utilized
Study a series of problems such as remanence of current transformer.
For in correlation technique to the magnetic remnant research of current transformer it is less efficient the problem of, there is presently no effectively
Solution.
The content of the invention
An embodiment of the present invention provides test method, device, storage medium and the processing of remanent magnetism in a kind of current transformer
Device, at least to solve the problems, such as the less efficient of the magnetic remnant research in correlation technique to current transformer.
According to one embodiment of present invention, a kind of test method of remanent magnetism in current transformer is provided, including：To quilt
The current transformer of measurement is demagnetized and measures the first error of the measured current transformer；Adjust DC power supply
The magnitude of current and the DC current that the magnitude of current is passed through to the measured current transformer；It is mutual in the measured electric current
In the case that sensor is in steady-state operating condition, the second error of the measured current transformer and described tested is measured
The current waveform of the Current Transformer Secondary side of amount；According to first error, second error and the DC current
The magnitude of current determine to be passed through the direct current measurement of the measured current transformer and the mistake of the measured current transformer
Correspondence between difference.
Optionally, demagnetized to measured current transformer and measure the first of the measured current transformer
Error includes：It connects demagnetization circuit and is passed through electric current to the additional winding being wrapped on the iron core of the measured current transformer
To eliminate original remanent magnetism on the measured current transformer；It disconnects the demagnetization circuit and connects the first error measure electricity
First error of the measured current transformer after the demagnetization of drive test amount.
Optionally, adjust the magnitude of current of DC power supply and be passed through the magnitude of current to the measured current transformer
DC current includes：Adjust the magnitude of current of DC power supply in magnetic assist circuit；The magnetic assist circuit is connected to be measured to described
Current transformer be passed through the DC current of the magnitude of current.
Optionally, the second error of the measured current transformer and the measured current transformer are measured
The current waveform of secondary side includes：Connect the measured electricity of the second error measuring circuitry measurement in steady-state operating condition
Second error of current transformer；Obtain the current waveform of the measured Current Transformer Secondary side.
According to another embodiment of the invention, a kind of experimental rig of remanent magnetism in current transformer is provided, including：It moves back
Magnetic module, first for the measured current transformer to be demagnetized and measured to measured current transformer misses
Difference；Processing module for the magnitude of current for adjusting DC power supply and is passed through the magnitude of current to the measured current transformer
DC current；Measurement module, in the case of being in steady-state operating condition in the measured current transformer, measurement
Second error of the measured current transformer and the current waveform of the measured Current Transformer Secondary side；Really
Cover half block, for according to the magnitude of current of first error, second error and the DC current determines to be passed through
Correspondence between the error of the direct current measurement of measured current transformer and the measured current transformer.
Optionally, the demagnetization module includes：First on-unit, it is described tested to being wrapped in for connecting demagnetization circuit
It is original on the measured current transformer to eliminate that additional winding on the iron core of the current transformer of amount is passed through electric current
Remanent magnetism；Second on-unit, for disconnect the demagnetization circuit and connect the first error measuring circuitry measurement demagnetization after described in
First error of measured current transformer.
Optionally, the processing module includes：Adjustment unit, for adjusting the electric current of DC power supply in magnetic assist circuit
Amount；3rd on-unit is passed through the magnitude of current for connecting the magnetic assist circuit to the measured current transformer
DC current.
Optionally, the measurement module includes：4th on-unit is in for connecting the second error measuring circuitry measurement
Second error of the measured current transformer of steady-state operating condition；Acquiring unit, it is described tested for obtaining
The current waveform of the Current Transformer Secondary side of amount.
According to still another embodiment of the invention, a kind of storage medium is additionally provided, the storage medium includes storage
Program, wherein, described program performs method described in any one of the above embodiments when running.
According to still another embodiment of the invention, a kind of processor is additionally provided, the processor is used for operation program,
In, described program performs method described in any one of the above embodiments when running.
By the present invention, demagnetized to measured current transformer and measure the first of measured current transformer
Error；It adjusts the magnitude of current of DC power supply and the DC current of the magnitude of current is passed through to measured current transformer；It is being measured
Current transformer be in steady-state operating condition in the case of, measure the second error of measured current transformer and tested
The current waveform of the Current Transformer Secondary side of amount；It is determined according to the magnitude of current of the first error, the second error and DC current
The correspondence being passed through between the direct current measurement of measured current transformer and the error of measured current transformer, thus
As it can be seen that using the above program according to the Current Mutual Inductance after the first error of the current transformer after the obtained demagnetization of measurement and magnetic assist
Second error of device is so that it is determined that correspondence between the direct current measurement and error of current transformer, so as to be used to study
Influence of the remanent magnetism to current transformer error, and the current waveform of Current Transformer Secondary side is measured, so as to utilize
The process of remanent magnetism in direct current measurement analog current mutual inductor, and can quantify and obtain remanent magnetism to current transformer error size
It influences, this improves the efficiency of the magnetic remnant research to current transformer, so as to solve in correlation technique to current transformer
Magnetic remnant research it is less efficient the problem of.
Description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description does not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the flow chart of the test method of remanent magnetism in a kind of current transformer according to embodiments of the present invention；
Fig. 2 is the signal for adding winding in a kind of current transformer according to embodiments of the present invention in the test method of remanent magnetism
Figure；
Fig. 3 is the structure diagram one of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention；
Fig. 4 is the structure diagram two of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention；
Fig. 5 is the structure diagram three of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention；
Fig. 6 is the structure diagram four of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention；
Fig. 7 is the equivalent circuit of the direct current magnetism-assisting analog current transformer iron core remanent magnetism of alternative embodiment according to the present invention
Figure.
Specific embodiment
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that do not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be the object for distinguishing similar, without being used to describe specific order or precedence.
Embodiment 1
A kind of test method of remanent magnetism in current transformer is provided in the present embodiment, and Fig. 1 is to implement according to the present invention
The flow chart of the test method of remanent magnetism in a kind of current transformer of example, as shown in Figure 1, the flow includes the following steps：
Step S102, first for being demagnetized to measured current transformer and measuring measured current transformer miss
Difference；
Step S104 adjusts the magnitude of current of DC power supply and the direct current of the magnitude of current is passed through to measured current transformer
Stream；
Step S106 in the case where measured current transformer is in steady-state operating condition, measures measured electricity
Second error of current transformer and the current waveform of measured Current Transformer Secondary side；
Step S108 determines to be passed through measured electricity according to the magnitude of current of the first error, the second error and DC current
Correspondence between the error of the direct current measurement of current transformer and measured current transformer.
Optionally, the test method of remanent magnetism can be, but not limited to be applied to remanence of current transformer in above-mentioned current transformer
In the scene of research.
Optionally, the test method of remanent magnetism can be, but not limited to be applied to remanence of current transformer in above-mentioned current transformer
Test platform, such as：Device of remanent magnetism experiment etc. is carried out to current transformer.
By above-mentioned steps, the electric current after the first error and magnetic assist of the current transformer after the demagnetization obtained according to measurement
Second error of mutual inductor is so that it is determined that correspondence between the direct current measurement and error of current transformer, so as to be used for
Influence of the remanent magnetism to current transformer error is studied, and measures the current waveform of Current Transformer Secondary side, so as to
Using the process of remanent magnetism in direct current measurement analog current mutual inductor, and it is big to current transformer error to quantify acquisition remanent magnetism
Small influence, it is mutual to electric current in correlation technique so as to solve this improves the efficiency of the magnetic remnant research to current transformer
The magnetic remnant research of sensor it is less efficient the problem of.
Optionally, in above-mentioned steps S102, can be, but not limited to measure measured Current Mutual Inductance in the following manner
First error of device：It connects demagnetization circuit and is passed through electric current to the additional winding being wrapped on the iron core of measured current transformer
To eliminate original remanent magnetism on measured current transformer, disconnect demagnetization circuit and connect the first error measuring circuitry measurement and move back
First error of the measured current transformer after magnetic.
Optionally, in the present embodiment, above-mentioned demagnetization circuit can be, but not limited to include：First alternating current source, transformer and
First current-limiting resistance, wherein, one end ground connection of the first alternating current source, the connection of the other end and transformer of the first alternating current source, transformation
Device is connected with additional winding and the first current-limiting resistance, and the first current-limiting resistance is connected with additional winding.
Optionally, in the present embodiment, above-mentioned transformer can be, but not limited to as auto-transformer.
Optionally, in above-mentioned steps S104, can be, but not limited to carry out magnetic assist to current transformer in the following manner：
The magnitude of current of DC power supply in magnetic assist circuit is adjusted, and connects magnetic assist circuit and is passed through the magnitude of current to measured current transformer
DC current.
Optionally, in the present embodiment, above-mentioned magnetic assist circuit can be, but not limited to include：Direct voltage source and the second current limliting
Resistance, wherein, the cathode of direct voltage source is connected with additional winding, and the anode of direct voltage source is connected with the second current-limiting resistance,
Second current-limiting resistance is connected with additional winding.
Optionally, in the present embodiment, magnetic assist circuit can with but be not limited to include：Resistive streamline circle, wherein, resistive stream
Coil is connected between the second current-limiting resistance and additional winding.
Optionally, in the present embodiment, above-mentioned direct voltage source can be, but not limited to as adjustable direct voltage source.
Optionally, in above-mentioned steps S106, can be, but not limited to measure the second error and electric current in the following manner
Waveform：The second error of measured current transformer of the second error measuring circuitry measurement in steady-state operating condition is connected,
Obtain the current waveform of measured Current Transformer Secondary side.
Optionally, in the present embodiment, the first error measuring circuitry and the second error measuring circuitry can be, but not limited to for
Same error measuring circuitry.
Optionally, in the present embodiment, error measuring circuitry can be, but not limited to include：Second alternating current source, normalized current
Mutual inductor and mutual-inductor tester, wherein, the second alternating current source respectively with additional winding, original winding and standard current transformer coupling
It closes, standard current transformer is connected with mutual-inductor tester, and mutual-inductor tester is connected with measured current transformer.
Optionally, in the present embodiment, the second alternating current source can be, but not limited to as adjustable alternating current source.
Optionally, in the present embodiment, the accuracy rating of standard current transformer can be, but not limited to as 0.01S.
Optionally, in the present embodiment, as shown in Fig. 2, measured Current Transformer Secondary side winding be divided into measurement around
Group and additional winding, respectively uniformly around on iron core, 1 represents measurement winding in Fig. 2, and 2 represent additional winding.Additional umber of turn
It is determined according to testing equipment parameter, generally 10-100 circles.Direct current formation additional magnetic is passed through to additional winding pass to mould during experiment
Intend remanent magnetism, the size for being passed through DC quantity is drawn by flux density on iron core hysteresis loop-electric current respective value reckoning.
Embodiment 2
A kind of experimental rig of remanent magnetism in current transformer is additionally provided in the present embodiment, which is used to implement above-mentioned
Embodiment and preferred embodiment had carried out repeating no more for explanation.As used below, term " module " can be real
The combination of the software and/or hardware of existing predetermined function.Although following embodiment described device is preferably realized with software,
But the realization of the combination of hardware or software and hardware is also what may and be contemplated.
Fig. 3 is the structure diagram one of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention, such as
Shown in Fig. 3, which includes：
Demagnetization module 32, for measured current transformer to be demagnetized and measured to measured current transformer
First error；
Processing module 34, coupled to demagnetization module 32, for the magnitude of current that adjusts DC power supply and to measured electric current
Mutual inductor is passed through the DC current of the magnitude of current；
Measurement module 36, coupled to processing module 34, for being in steady-state operating condition in measured current transformer
In the case of, measure the second error of measured current transformer and the current wave of measured Current Transformer Secondary side
Shape；
Determining module 38, coupled to measurement module 36, for the electricity according to the first error, the second error and DC current
Flow determines to be passed through corresponding between the direct current measurement of measured current transformer and the error of measured current transformer
Relation.
Optionally, the experimental rig of remanent magnetism can be, but not limited to be applied to remanence of current transformer in above-mentioned current transformer
In the scene of research.
Optionally, the experimental rig of remanent magnetism can be, but not limited to be applied to remanence of current transformer in above-mentioned current transformer
Test platform, such as：Device of remanent magnetism experiment etc. is carried out to current transformer.
By above device, the electric current after the first error and magnetic assist of the current transformer after the demagnetization obtained according to measurement
Second error of mutual inductor is so that it is determined that correspondence between the direct current measurement and error of current transformer, so as to be used for
Influence of the remanent magnetism to current transformer error is studied, and measures the current waveform of Current Transformer Secondary side, so as to
Using the process of remanent magnetism in direct current measurement analog current mutual inductor, and it is big to current transformer error to quantify acquisition remanent magnetism
Small influence, it is mutual to electric current in correlation technique so as to solve this improves the efficiency of the magnetic remnant research to current transformer
The magnetic remnant research of sensor it is less efficient the problem of.
Fig. 4 is the structure diagram two of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention, such as
Shown in Fig. 4, optionally, demagnetization module 32 includes：
First on-unit 42, it is attached on the iron core of measured current transformer to being wrapped in for connecting demagnetization circuit
Winding is added to be passed through electric current to eliminate original remanent magnetism on measured current transformer；
Second on-unit 44 coupled to the first on-unit 42, is surveyed for disconnecting demagnetization circuit and connecting the first error
Measure the first error of the measured current transformer after circuit measuring demagnetization.
Optionally, in the present embodiment, above-mentioned demagnetization circuit can be, but not limited to include：First alternating current source, transformer and
First current-limiting resistance, wherein, one end ground connection of the first alternating current source, the connection of the other end and transformer of the first alternating current source, transformation
Device is connected with additional winding and the first current-limiting resistance, and the first current-limiting resistance is connected with additional winding.
Optionally, in the present embodiment, above-mentioned transformer can be, but not limited to as auto-transformer.
Fig. 5 is the structure diagram three of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention, such as
Shown in Fig. 5, optionally, processing module 34 includes：
Adjustment unit 52, for adjusting the magnitude of current of DC power supply in magnetic assist circuit；
3rd on-unit 54, coupled to adjustment unit 52, for connecting magnetic assist circuit to measured current transformer
It is passed through the DC current of the magnitude of current.
Optionally, in the present embodiment, above-mentioned magnetic assist circuit can be, but not limited to include：Direct voltage source and the second current limliting
Resistance, wherein, the cathode of direct voltage source is connected with additional winding, and the anode of direct voltage source is connected with the second current-limiting resistance,
Second current-limiting resistance is connected with additional winding.
Optionally, in the present embodiment, magnetic assist circuit can with but be not limited to include：Resistive streamline circle, wherein, resistive stream
Coil is connected between the second current-limiting resistance and additional winding.
Optionally, in the present embodiment, above-mentioned direct voltage source can be, but not limited to as adjustable direct voltage source.
Fig. 6 is the structure diagram four of the experimental rig of remanent magnetism in a kind of current transformer according to embodiments of the present invention, such as
Shown in Fig. 6, optionally, measurement module 36 includes：
4th on-unit 62, it is measured in steady-state operating condition for connecting the measurement of the second error measuring circuitry
Second error of current transformer；
Acquiring unit 64, coupled to the 4th on-unit 62, for obtaining the electricity of measured Current Transformer Secondary side
Flow waveform.
Optionally, in the present embodiment, the first error measuring circuitry and the second error measuring circuitry can be, but not limited to for
Same error measuring circuitry.
Optionally, in the present embodiment, error measuring circuitry can be, but not limited to include：Second alternating current source, normalized current
Mutual inductor and mutual-inductor tester, wherein, the second alternating current source respectively with additional winding, original winding and standard current transformer coupling
It closes, standard current transformer is connected with mutual-inductor tester, and mutual-inductor tester is connected with measured current transformer.
Optionally, in the present embodiment, the second alternating current source can be, but not limited to as adjustable alternating current source.
Optionally, in the present embodiment, the accuracy rating of standard current transformer can be, but not limited to as 0.01S.
Optionally, in the present embodiment, as shown in Fig. 2, measured Current Transformer Secondary side winding be divided into measurement around
Group and additional winding, respectively uniformly around on iron core, 1 represents measurement winding in Fig. 2, and 2 represent additional winding.Additional umber of turn
It is determined according to testing equipment parameter, generally 10-100 circles.Direct current formation additional magnetic is passed through to additional winding pass to mould during experiment
Intend remanent magnetism, the size for being passed through DC quantity is drawn by flux density on iron core hysteresis loop-electric current respective value reckoning.
It should be noted that above-mentioned modules can be realized by software or hardware, for the latter, Ke Yitong
In the following manner realization is crossed, but not limited to this：Above-mentioned module is respectively positioned in same processor；Alternatively, above-mentioned module is respectively positioned at more
In a processor.
It is described in detail with reference to alternative embodiment of the present invention.
Alternative embodiment of the present invention provides a kind of design side based on direct current magnetism-assisting analog current transformer iron core remanent magnetism
Method by the use of the DC quantity for being passed through iron core as medium, by measuring the relation curve of DC quantity and error, quantitatively obtains remanent magnetism influence
The degree of current transformer error.
Fig. 7 is the equivalent circuit of the direct current magnetism-assisting analog current transformer iron core remanent magnetism of alternative embodiment according to the present invention
Figure, as shown in fig. 7, ip、idcRespectively primary side current and magnetic field supporting current；i’p、ie、isTo convert once total electricity to secondary side
Stream, exciting current and secondary current；LeFor magnetizing inductance；Zct、ZbRespectively secondary side winding impedance, secondary load impedance；n1、
N2, n3 are current transformer primary side, secondary side, additional umber of turn.
When, there are during remanent magnetism, remanent magnetism can be overlapped with the alternating flux in iron core in current transformer core, because surplus
Magnetic has directionality, so the iron core magnetic flux of the half period in the same direction with remanent magnetism can increase, and the half period magnetic that direction is opposite
General rule can reduce.Just because of the effect of remanent magnetism, iron core magnetic flux positive-negative half-cycle is asymmetric, and easily reaches saturation state.
If 0~t periods, the voltage of Current Transformer Secondary side is u=kcos ω t, then according to the law of electromagnetic inductionShown in the exciting current such as formula (1) that t moment current transformer can be acquired.L in formula (1)eRepresent excitation electricity
Sense, Φ0Represent iron core remanent magnetism.
From formula (1), due to the influence of remanent magnetism, exciting current includes a part of stationary component, this stationary component can carry
The operating magnetic field flux of high current mutual inductor.Direct current is injected to iron core using additional winding, since the effect of dc magnetization power causes iron
The magnetic domain of core inner is integrally moved to a direction, forms direct current magnetism-assisting in core interior, although such direct current magnetism-assisting is artificial
Apply, but the operating point of alternating flux in iron core can be improved, reach and the same effect of remanent magnetism.
Assuming that during current transformer steady-state operation shown in the expression formula of primary side current such as formula (2).A tables in formula (2)
Show current amplitude, θ represents to be passed through the phase of electric current.
ip=asin (ω t+ θ) (2)
Circuit fundamental equation as can be seen from FIG. 7 is：
In formula：Kn1=n2/n1；Kn2=n2/n3；L2=Lct+Lb；Rs=Rct+Rb。
Formula (3) is subjected to Induction Solved by Laplace Transformation solution, can obtain exciting current expression formula is：
ie=ie_dc+ie_ac+ie_dec (4)
In formula：
Understand that current transformer core exciting current is divided into Constant Direct Current component i by formula (4)e_dc, alternating constant component
ie_ac, attenuation components ie_decThree parts.After current transformer stable operation for a period of time, attenuation components in exciting current are can be considered
ie_dec=0, then exciting current is then at this time：
Assuming that secondary load is pure resistance, and ignore leakage impedance, i.e. Tb=0, then formula (5) can be converted into：
In formula (6)：β=arctan (ω Ts)。
For the current transformer applied in practice,Therefore the expression formula of exciting current is：
It is understood according to formula (7), the direct current injected from additional winding can become excitation in current transformer steady-state operation
The constant part of electric current, forms constant magnetic flux in core interior.Compare formula (1) and formula (7) is understood, two kinds of feelings
Exciting current expression formula under condition is close, and the first term of expression formula represents the perseverance that direct current magnetism-assisting and remanent magnetism are formed in exciting current
Determine component, this stationary component can accelerate the saturation of current transformer, and the Section 2 of expression formula is current transformer primary current
, therefore be feasible with direct current magnetism-assisting analog current transformer iron core remanent magnetism.
In this alternative embodiment, the test method of direct current magnetism-assisting simulation remanent magnetism includes the following steps：
Step 1, with AC demagnetization circuit decorporate subject current transformer core in original remanent magnetism.
Step 2, exchange is passed through to primary side, while direct current magnetism-assisting is passed through using additional winding, be passed through the size of DC quantity
According to the flux density on iron core hysteresis loop -- the reckoning of electric current respective value can obtain.
Step 3, measurement current transform er secondary side current waveform and measurement error after current transformer steady-state operation.
In conclusion the test method that the remanent magnetism generates can be passed through the DC quantity and current transformer of iron core by measurement
The relation curve of error studies influence of the remanent magnetism to error, quantitatively obtains remanent magnetism to current transformer error size influence amount.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, the ordinary skill of this field
Personnel can be modified or replaced equivalently technical scheme, without departing from the spirit and scope of the present invention, this
The protection domain of invention should be subject to described in claim.
Embodiment 4
The embodiment of the present invention additionally provides a kind of storage medium, which includes the program of storage, wherein, it is above-mentioned
Program performs method described in any one of the above embodiments when running.
Optionally, in the present embodiment, above-mentioned storage medium can be configured to storage for performing the journey of following steps
Sequence code：
S1 demagnetizes to measured current transformer and measures the first error of measured current transformer；
S2 adjusts the magnitude of current of DC power supply and the DC current of the magnitude of current is passed through to measured current transformer；
S3 in the case where measured current transformer is in steady-state operating condition, measures measured Current Mutual Inductance
Second error of device and the current waveform of measured Current Transformer Secondary side；
S4 determines to be passed through measured Current Mutual Inductance according to the magnitude of current of the first error, the second error and DC current
Correspondence between the error of the direct current measurement of device and measured current transformer.
Optionally, in the present embodiment, above-mentioned storage medium can include but is not limited to：USB flash disk, read-only memory (Read-
Only Memory, referred to as ROM), it is random access memory (Random Access Memory, referred to as RAM), mobile hard
The various media that can store program code such as disk, magnetic disc or CD.
The embodiment of the present invention additionally provides a kind of processor, which is used for operation program, wherein, program operation
Step in Shi Zhihang any of the above-described methods.
Optionally, in the present embodiment, above procedure is used to perform following steps：
S1 demagnetizes to measured current transformer and measures the first error of measured current transformer；
S2 adjusts the magnitude of current of DC power supply and the DC current of the magnitude of current is passed through to measured current transformer；
S3 in the case where measured current transformer is in steady-state operating condition, measures measured Current Mutual Inductance
Second error of device and the current waveform of measured Current Transformer Secondary side；
S4 determines to be passed through measured Current Mutual Inductance according to the magnitude of current of the first error, the second error and DC current
Correspondence between the error of the direct current measurement of device and measured current transformer.
Optionally, the specific example in the present embodiment may be referred to described in above-described embodiment and optional embodiment
Example, details are not described herein for the present embodiment.
Obviously, those skilled in the art should be understood that each module of the above-mentioned present invention or each step can be with general
Computing device realize that they can concentrate on single computing device or be distributed in multiple computing devices and be formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
Performed in the storage device by computing device, and in some cases, can be performed with the order being different from herein shown in
The step of going out or describing they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.It to be combined in this way, the present invention is not limited to any specific hardware and softwares.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All any modifications within the principle of the present invention, made, etc.
With replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of test method of remanent magnetism in current transformer, which is characterized in that including：
It is demagnetized to measured current transformer and measures the first error of the measured current transformer；
It adjusts the magnitude of current of DC power supply and the DC current of the magnitude of current is passed through to the measured current transformer；
In the case where the measured current transformer is in steady-state operating condition, the measured Current Mutual Inductance is measured
Second error of device and the current waveform of the measured Current Transformer Secondary side；
It determines to be passed through according to the magnitude of current of first error, second error and the DC current described measured
Correspondence between the error of the direct current measurement of current transformer and the measured current transformer.
2. it according to the method described in claim 1, it is characterized in that, is demagnetized to measured current transformer and measures institute
Stating the first error of measured current transformer includes：
It connects demagnetization circuit and is passed through electric current to the additional winding being wrapped on the iron core of the measured current transformer to disappear
Except original remanent magnetism on the measured current transformer；
It disconnects the demagnetization circuit and connects the measured current transformer after the measurement demagnetization of the first error measuring circuitry
First error.
3. according to the method described in claim 1, it is characterized in that, adjusting the magnitude of current of DC power supply and to described measured
The DC current that current transformer is passed through the magnitude of current includes：
Adjust the magnitude of current of DC power supply in magnetic assist circuit；
Connect the DC current that the magnetic assist circuit is passed through the magnitude of current to the measured current transformer.
4. according to the method described in claim 1, it is characterized in that, the second error of the measurement measured current transformer
And the current waveform of the measured Current Transformer Secondary side includes：
Connect described the of the measured current transformer of the second error measuring circuitry measurement in steady-state operating condition
Two errors；
Obtain the current waveform of the measured Current Transformer Secondary side.
5. a kind of experimental rig of remanent magnetism in current transformer, which is characterized in that including：
It demagnetizes module, for the of the measured current transformer to be demagnetized and measured to measured current transformer
One error；
Processing module for the magnitude of current for adjusting DC power supply and is passed through the magnitude of current to the measured current transformer
DC current；
Measurement module in the case of being in steady-state operating condition in the measured current transformer, measures the quilt
Second error of the current transformer of measurement and the current waveform of the measured Current Transformer Secondary side；
Determining module, for determining to lead to according to the magnitude of current of first error, second error and the DC current
Enter the corresponding pass between the direct current measurement of the measured current transformer and the error of the measured current transformer
System.
6. device according to claim 5, which is characterized in that the demagnetization module includes：
First on-unit, it is additional on the iron core of the measured current transformer to being wrapped in for connecting demagnetization circuit
Winding is passed through electric current to eliminate original remanent magnetism on the measured current transformer；
Second on-unit, for disconnecting the demagnetization circuit and connecting the quilt after the measurement demagnetization of the first error measuring circuitry
First error of the current transformer of measurement.
7. device according to claim 5, which is characterized in that the processing module includes：
Adjustment unit, for adjusting the magnitude of current of DC power supply in magnetic assist circuit；
3rd on-unit is passed through the magnitude of current for connecting the magnetic assist circuit to the measured current transformer
DC current.
8. device according to claim 5, which is characterized in that the measurement module includes：
4th on-unit, for connecting the measured electricity of the second error measuring circuitry measurement in steady-state operating condition
Second error of current transformer；
Acquiring unit, for obtaining the current waveform of the measured Current Transformer Secondary side.
9. a kind of storage medium, which is characterized in that the storage medium includes the program of storage, wherein, when described program is run
Method any one of perform claim requirement 1 to 4.
10. a kind of processor, which is characterized in that the processor is used for operation program, wherein, right of execution when described program is run
Profit requires the method any one of 1 to 4.
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| CN201711102943.5A CN108061872B (en) | 2017-11-09 | 2017-11-09 | Method and device for testing residual magnetism in current transformer, storage medium and processor |
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| CN201711102943.5A CN108061872B (en) | 2017-11-09 | 2017-11-09 | Method and device for testing residual magnetism in current transformer, storage medium and processor |
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| CN113030832A (en) * | 2021-03-22 | 2021-06-25 | 苏州电器科学研究院股份有限公司 | Device and method for detecting composite error of current transformer |
| CN116027237A (en) * | 2023-02-11 | 2023-04-28 | 广州市德珑电子器件有限公司 | Current transformer remanence measurement method, system, equipment and medium |
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|---|---|
| CN108061872B (en) | 2020-06-05 |
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