CN207396711U - The hookup of remanent magnetism in current transformer - Google Patents
The hookup of remanent magnetism in current transformer Download PDFInfo
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- CN207396711U CN207396711U CN201721491728.4U CN201721491728U CN207396711U CN 207396711 U CN207396711 U CN 207396711U CN 201721491728 U CN201721491728 U CN 201721491728U CN 207396711 U CN207396711 U CN 207396711U
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- 230000005389 magnetism Effects 0.000 title claims abstract description 81
- 238000004804 winding Methods 0.000 claims abstract description 60
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 230000005347 demagnetization Effects 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 7
- 239000007924 injection Substances 0.000 claims abstract description 7
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- 238000000034 method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 14
- 238000005259 measurement Methods 0.000 description 11
- 239000011162 core material Substances 0.000 description 10
- 230000004907 flux Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
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- 230000009931 harmful effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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Abstract
The utility model provides a kind of hookup of remanent magnetism in current transformer, wherein, this method includes：The hookup of remanent magnetism includes in current transformer：Additional winding, demagnetization circuit, magnetic assist circuit and error measuring circuitry, wherein, demagnetization circuit is connected with additional winding, and magnetic assist circuit is connected with additional winding, on the iron core of measured current transformer, error measuring circuitry is connected additional winding uniform winding with original winding on iron core；Demagnetization circuit is used to eliminate original remanent magnetism on measured current transformer, magnetic assist circuit is used for measured current transformer Injection Current to simulate the remanent magnetism of measured current transformer, and error measuring circuitry is used to measure the error of measured current transformer.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 utility model is related to the communications field, in particular to a kind of hookup of remanent magnetism in current transformer.
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.
Utility model content
The utility model embodiment provides a kind of hookup of remanent magnetism in current transformer, at least to solve related skill
In art to the magnetic remnant research of current transformer it is less efficient the problem of.
One embodiment according to the present utility model provides a kind of hookup of remanent magnetism in current transformer, including：
Additional winding, demagnetization circuit, magnetic assist circuit and error measuring circuitry, wherein, the demagnetization circuit is connected with the additional winding,
The magnetic assist circuit is connected with the additional winding, and the additional winding uniform winding is in the iron core of measured current transformer
On, the error measuring circuitry is connected with original winding on the iron core；The demagnetization circuit is described measured for eliminating
Current transformer on original remanent magnetism, the magnetic assist circuit be used for the measured current transformer Injection Current with mould
Intend the remanent magnetism of the measured current transformer, the error measuring circuitry is used to measure the measured current transformer
Error.
Optionally, the demagnetization circuit includes：First alternating current source, transformer and the first current-limiting resistance, wherein, described first
One end ground connection of alternating current source, the other end of first alternating current source and the connection of the transformer, the transformer with it is described attached
Winding is added to be connected with first current-limiting resistance, first current-limiting resistance is connected with the additional winding.
Optionally, the transformer is auto-transformer.
Optionally, the magnetic assist circuit includes：Direct voltage source and the second current-limiting resistance, wherein, the direct voltage source
Cathode be connected with the additional winding, the anode of the direct voltage source is connected with second current-limiting resistance, described second
Current-limiting resistance is connected with the additional winding.
Optionally, the magnetic assist circuit further includes：Resistive streamline circle, wherein, the resistive streamline circle is connected to described
Between two current-limiting resistances and the additional winding.
Optionally, the direct voltage source is adjustable direct voltage source.
Optionally, the error measuring circuitry includes：Second alternating current source, standard current transformer and mutual-inductor tester,
Wherein, second alternating current source couples respectively with the additional winding, original winding and the standard current transformer, institute
It states standard current transformer to be connected with the mutual-inductor tester, the mutual-inductor tester and the measured Current Mutual Inductance
Device connects.
Optionally, second alternating current source is adjustable alternating current source.
Optionally, the accuracy rating of the standard current transformer is 0.01S.
Optionally, the hookup further includes：Ammeter, wherein, the ammeter be connected to the additional winding with
Between the demagnetization circuit, and the ammeter is connected between the additional winding and the magnetic assist circuit.
By the utility model, the hookup of remanent magnetism includes in current transformer：Additional winding, demagnetization circuit, magnetic assist
Circuit and error measuring circuitry, wherein, demagnetization circuit is connected with additional winding, and magnetic assist circuit is connected with additional winding, add around
On the iron core of measured current transformer, error measuring circuitry is connected group uniform winding with original winding on iron core；It moves back
Magnetic circuit is used to eliminate original remanent magnetism on measured current transformer, and magnetic assist circuit is used for measured current transformer
To simulate the remanent magnetism of measured current transformer, error measuring circuitry is used to measure measured current transformer Injection Current
Error, it can be seen that, original remanent magnetism on measured current transformer is eliminated by demagnetization circuit using the above program, is led to
Magnetic assist circuit is crossed to measured current transformer Injection Current to simulate the remanent magnetism of measured current transformer, passes through error
The error of the measured current transformer of measuring circuit measurement, so as to study influence of the remanent magnetism to current transformer error,
So as to utilize the process of remanent magnetism in direct current measurement analog current mutual inductor, and it can quantify and obtain remanent magnetism to Current Mutual Inductance
The influence of device error size, this improves the efficiency of the magnetic remnant research to current transformer, so as to solve in correlation technique
To the magnetic remnant research of current transformer it is less efficient the problem of.
Description of the drawings
Attached drawing described herein is used to provide a further understanding of the present invention, and forms the part of the application,
The schematic description and description of the utility model is not formed for explaining the utility model to the improper of the utility model
It limits.In the accompanying drawings：
Fig. 1 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
One；
Fig. 2 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Two；
Fig. 3 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Three；
Fig. 4 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Four；
Fig. 5 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment；
Fig. 6 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Six；
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；
Fig. 8 is the schematic diagram of the hookup of optional embodiment according to the present invention.
Specific embodiment
The utility model is described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that it is not rushing
In the case of prominent, the feature in embodiment and embodiment in the application can be mutually combined.
It should be noted that term " first " in the specification and claims of the utility model and above-mentioned attached drawing,
" second " etc. is the object for distinguishing similar, without being used to describe specific order or precedence.
A kind of hookup of remanent magnetism in current transformer is additionally provided in the present embodiment, and Fig. 1 is new according to this practicality
The structure diagram one of the hookup of remanent magnetism in a kind of current transformer of type embodiment, as shown in Figure 1, the hookup bag
It includes：Additional winding 102, demagnetization circuit 104, magnetic assist circuit 106 and error measuring circuitry 108, wherein,
Demagnetization circuit 104 is connected with additional winding 102, and magnetic assist circuit 106 is connected with additional winding 102, adds winding 102
Uniform winding is on the iron core 110 of measured current transformer 100, error measuring circuitry and original winding 112 on iron core
Connection；
Demagnetization circuit 104 is used to eliminate original remanent magnetism on measured current transformer, and magnetic assist circuit 106 is used for quilt
To simulate the remanent magnetism of measured current transformer, error measuring circuitry 108 is used to survey the current transformer Injection Current of measurement
The error of the measured current transformer of amount.
Optionally, the hookup 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 hookup 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 foregoing circuit, original remanent magnetism on measured current transformer is eliminated by demagnetization circuit, passes through magnetic assist
Circuit, to simulate the remanent magnetism of measured current transformer, passes through error measure electricity to measured current transformer Injection Current
The error for the current transformer that drive test amount is measured, so as to study influence of the remanent magnetism to current transformer error, so as to
To utilize the process of remanent magnetism in direct current measurement analog current mutual inductor, and it can quantify and obtain remanent magnetism to current transformer error
The influence of size, this improves the efficiency of the magnetic remnant research to current transformer, so as to solve in correlation technique to electric current
The magnetic remnant research of mutual inductor it is less efficient the problem of.
Fig. 2 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Two, as shown in Fig. 2, optionally, demagnetization circuit 104 includes：First alternating current source 202,204 and first current-limiting resistance 206 of transformer,
Wherein,
One end ground connection of first alternating current source 202, the other end of the first alternating current source 202 are connected with transformer 204, transformer
204 are connected with additional 102 and first current-limiting resistance 206 of winding, and the first current-limiting resistance 206 is connected with additional winding 102.
Optionally, transformer 204 is auto-transformer.
Fig. 3 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Three, as shown in figure 3, optionally, magnetic assist circuit 106 includes：302 and second current-limiting resistance 304 of direct voltage source, wherein,
The cathode of direct voltage source 302 is connected with additional winding 102, the anode of direct voltage source 302 and the second current limliting electricity
304 connection of resistance, the second current-limiting resistance 304 are connected with additional winding 102.
Fig. 4 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Four, as shown in figure 4, optionally, magnetic assist circuit 106 further includes：Resistive streamline circle 402, wherein, resistive streamline circle 402 is connected to
Between second current-limiting resistance 304 and additional winding 102.
Optionally, direct voltage source is adjustable direct voltage source.
Fig. 5 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Five, as shown in figure 5, optionally, error measuring circuitry 108 includes：Second alternating current source 502, standard current transformer 504 and mutual inductance
Device tester 506, wherein,
Second alternating current source 502 couples (Fig. 5 with additional winding 102, original winding 112 and standard current transformer 504 respectively
Shown in middle dotted line), standard current transformer 504 is connected with mutual-inductor tester 506, mutual-inductor tester 506 be measured
Current transformer 100 connects.
Optionally, the second alternating current source is adjustable alternating current source.
Optionally, the accuracy rating of standard current transformer is 0.01S.
Fig. 6 is the structure diagram of the hookup of remanent magnetism in a kind of current transformer according to the utility model embodiment
Six, as shown in fig. 6, optionally, hookup further includes：Ammeter 602, wherein,
Ammeter 602 is connected between additional winding 102 and demagnetization circuit 104, and ammeter 602 be connected to it is additional around
Between group 102 and magnetic assist circuit 106.
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 the utility model alternative embodiment.
The utility model alternative embodiment provides a kind of direct current magnetism-assisting simulation iron core and generates remanent magnetism test platform, with being passed through
The DC quantity of iron core is as medium, by measuring the relation curve of DC quantity and error, so as to quantificational expression remanent magnetism and error
The influence of relation, i.e. remanent magnetism to current transformer.
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 equivalent analysis based on direct current magnetism-assisting and remanent magnetism devises direct current magnetism-assisting simulation iron core production
Raw remanent magnetism test platform, Fig. 8 is the schematic diagram of the hookup of optional embodiment according to the present invention, as shown in figure 8, AC1 is
380V alternating current sources, T1 are auto-transformer, and R2 is current-limiting resistance, and DC is adjustable direct voltage source, and R3 is to adjust current resistor, L1
To hinder AC coil, AC2 is adjustable alternating current source.
The test platform is made of AC demagnetization circuit, direct current magnetism-assisting circuit and error measuring circuitry three parts, sharp first
With original remanent magnetism in AC demagnetization circuit for eliminating current transformer core；Then exchange is passed through to current transformer primary side, together
Shi Liyong adds winding and is passed through direct current magnetism-assisting, and the size for being passed through direct current is pushed away by the flux density on iron core hysteresis loop-electric current corresponding points
It draws；Finally measurable Current Transformer Secondary side current waveform and measurement error after current transformer steady-state operation.Such as
This, can study influence of the remanent magnetism to error by measuring the relation of the DC quantity being passed through and current transformer error, so as to
It can determine quantifier elimination remanence of current transformer problem.
In this hookup, including：AC demagnetization circuit, direct current magnetism-assisting circuit and error measuring circuitry.It is moved back in exchange
In magnetic circuit, AC1 is 380V alternating current sources, T1 is auto-transformer, R2 is current-limiting resistance.Experiment is moved back using demagnetization method of opening a way
Magnetic, it is internal there is no original remanent magnetism when ensureing that iron core is passed through direct current magnetism-assisting, it is mutually tired with direct current magnetism-assisting to eliminate original remanent magnetism
The interference generated after adding to experiment accuracy.
In direct current magnetism-assisting circuit, DC is adjustable direct voltage source, R3 is adjusting current resistor, L1 is resistance AC coil.
The current interference between error measuring circuitry and direct current magnetism-assisting circuit can be prevented using L1 coils.
In error measuring circuitry, AC2 is adjustable alternating current source, to adjust current transformer steady state run current, is added
Umber of turn can be designed according to actual demand, using Portable mutual inductor tester measurement current transform er measurement error.And
In order to ensure the precision of error measure, the accuracy rating of the standard current transformer used is 0.01S, current transformer load box
The accuracy of Z is ± 3%.
In this alternative embodiment, above-mentioned test platform includes following operating procedure：
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.
Test platform designed by the utility model patent, by additional winding to current transformer core inject direct current with
Remanent magnetism is simulated, so as to study influence of the remanent magnetism to error by the DC quantity being passed through and the relation of current transformer error, is solved
The total quantitative problem of magnetic remnant research of having determined, wherein, the DC quantity being passed through can be corresponded to according to the flux density on iron core B-H loop-electric current
Point is calculated and obtained.Entire test platform is simple and easy to do, can be used to influence of the quantitative study remanent magnetism to current transformer.
Above example is only to illustrate the technical solution of the utility model rather than is limited, this field it is common
Technical staff can be modified or replaced equivalently the technical solution of the utility model, without departing from the essence of the utility model
God and scope, the scope of protection of the utility model should be subject to described in claim.
Obviously, those skilled in the art should be understood that each module of above-mentioned the utility model or each step can be used
General computing device realizes that they can concentrate on single computing device or be distributed in multiple computing device institutes
On the network of composition, optionally, they can be realized with the program code that computing device can perform, it is thus possible to by they
Storage is performed in the storage device by computing device, and in some cases, can be performed with the order being different from herein
They are either fabricated to each integrated circuit modules or by multiple moulds in them by shown or described step respectively
Block or step are fabricated to single integrated circuit module to realize.In this way, the utility model be not restricted to any specific hardware and
Software combines.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all within the principle of the utility model, institute
Any modification, equivalent substitution, improvement and etc. of work, should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of hookup of remanent magnetism in current transformer, which is characterized in that including：Additional winding, demagnetization circuit, magnetic assist electricity
Road and error measuring circuitry, wherein,
The demagnetization circuit is connected with the additional winding, and the magnetic assist circuit is connected with the additional winding, it is described it is additional around
Group uniform winding is on the iron core of measured current transformer, the error measuring circuitry and original winding on the iron core
Connection；
The demagnetization circuit is used to eliminating original remanent magnetism on the measured current transformer, the magnetic assist circuit be used for
The measured current transformer Injection Current is to simulate the remanent magnetism of the measured current transformer, the error measure
Circuit is used to measure the error of the measured current transformer.
2. hookup according to claim 1, which is characterized in that the demagnetization circuit includes：First alternating current source, transformation
Device and the first current-limiting resistance, wherein,
One end ground connection of first alternating current source, the other end of first alternating current source and the connection of the transformer, the change
Depressor is connected with the additional winding and first current-limiting resistance, and first current-limiting resistance is connected with the additional winding.
3. hookup according to claim 2, which is characterized in that the transformer is auto-transformer.
4. hookup according to claim 1, which is characterized in that the magnetic assist circuit includes：Direct voltage source and
Two current-limiting resistances, wherein,
The cathode of the direct voltage source is connected with the additional winding, the anode of the direct voltage source and second current limliting
Resistance connects, and second current-limiting resistance is connected with the additional winding.
5. hookup according to claim 4, which is characterized in that the magnetic assist circuit further includes：Resistive streamline circle,
In, the resistive streamline circle is connected between second current-limiting resistance and the additional winding.
6. hookup according to claim 4, which is characterized in that the direct voltage source is adjustable direct voltage source.
7. hookup according to claim 1, which is characterized in that the error measuring circuitry includes：Second alternating current source,
Standard current transformer and mutual-inductor tester, wherein,
Second alternating current source couples respectively with the additional winding, original winding and the standard current transformer, institute
It states standard current transformer to be connected with the mutual-inductor tester, the mutual-inductor tester and the measured Current Mutual Inductance
Device connects.
8. hookup according to claim 7, which is characterized in that second alternating current source is adjustable alternating current source.
9. hookup according to claim 7, which is characterized in that the accuracy rating of the standard current transformer is
0.01S。
10. hookup according to any one of claim 1 to 9, which is characterized in that the hookup further includes：
Ammeter, wherein,
The ammeter is connected between the additional winding and the demagnetization circuit, and the ammeter be connected to it is described attached
Add between winding and the magnetic assist circuit.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109342988A (en) * | 2018-12-20 | 2019-02-15 | 广东电网有限责任公司 | A kind of remanence of current transformer influence test method, apparatus and system |
| CN113589213A (en) * | 2021-07-06 | 2021-11-02 | 国网青海省电力公司营销服务中心 | Method for testing metering characteristics of mutual inductor under special load condition of power grid |
| CN115877307A (en) * | 2022-11-18 | 2023-03-31 | 国网青海省电力公司营销服务中心 | Residual magnetism overhauling method for 10kV-110kV current transformer |
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2017
- 2017-11-09 CN CN201721491728.4U patent/CN207396711U/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342988A (en) * | 2018-12-20 | 2019-02-15 | 广东电网有限责任公司 | A kind of remanence of current transformer influence test method, apparatus and system |
| CN113589213A (en) * | 2021-07-06 | 2021-11-02 | 国网青海省电力公司营销服务中心 | Method for testing metering characteristics of mutual inductor under special load condition of power grid |
| CN113589213B (en) * | 2021-07-06 | 2024-01-12 | 国网青海省电力公司营销服务中心 | Method for testing metering characteristics of mutual inductor under special load condition of power grid |
| CN115877307A (en) * | 2022-11-18 | 2023-03-31 | 国网青海省电力公司营销服务中心 | Residual magnetism overhauling method for 10kV-110kV current transformer |
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