CN205666125U - Anti direct current measuring current transformer - Google Patents
Anti direct current measuring current transformer Download PDFInfo
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- CN205666125U CN205666125U CN201620557283.4U CN201620557283U CN205666125U CN 205666125 U CN205666125 U CN 205666125U CN 201620557283 U CN201620557283 U CN 201620557283U CN 205666125 U CN205666125 U CN 205666125U
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- 238000004804 winding Methods 0.000 claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 230000005291 magnetic effect Effects 0.000 claims description 20
- 230000009466 transformation Effects 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 229910000889 permalloy Inorganic materials 0.000 claims description 3
- 239000011162 core material Substances 0.000 description 24
- 230000033228 biological regulation Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Transformers For Measuring Instruments (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model relates to an anti direct current measuring current transformer, current transformer is cascaded by the fast saturation coil in first order antisaturation coil and the second level and constitutes, the primary winding of first order antisaturation coil connects the primary current input terminal, the secondary of first order antisaturation coil connects the primary winding of the fast saturation coil in the second level, the secondary of the fast saturation coil in the second level connects secondary current output terminal. The utility model discloses a fast saturation coil in first order antisaturation coil and the second level cascades, and it can normal work when direct current content is higher, and secondary output current satisfies the requirement of instrument security personnel electric current simultaneously, uses with current transformer as the measurement in the higher circuit of mountable dc component in the electric wire netting.
Description
Technical field
This utility model relates to a kind of current transformer, refers in particular to anti-DC measurement Current Transformer.
Background technology
Power system big electric current once is converted into the small area analysis of 5A or 1A by Verification of Measuring Current Transformer, with electric energy meter altogether
With the current measurement circuit of composition electric power meter, its performance quality is directly connected to the accuracy of electric energy metrical, impact electricity
The fairness of energy trade settlement.
The ratio difference (f) of Verification of Measuring Current Transformer and phase contrast (δ) are the key indexs characterizing its performance quality, its
In structure relevant with the factor such as the core material of current transformer, core section, umber of turn and winding wire diameter, on using with
Operating current size, frequency, waveform and the secondary load of current transformer are relevant.The Current Mutual Inductance being arranged in power system
Utensil has the structure determined, its error performance depends primarily on operating condition.When system normal steady state runs, current transformer
Primary current be generally power frequency sine wave, if the no-load voltage ratio of current transformer and rated sencondaryload select appropriate, it runs mistake
Difference can reach desired target.
But at some in particular cases, the primary current of current transformer may contain direct current or harmonic component,
The even half-sinusoid after diode rectification.These non-power frequency compositions, especially DC component can be to current transformers
Transfer characteristic affects greatly, and D.C. magnetic biasing magnetic flux and exchange flux are superimposed, the half cycle ferrum consistent with D.C. magnetic biasing direction
Heart degree of saturation increases, and causes current transformer iron core pcrmeability to decline, and exciting current increases.Additionally, DC component also can be
Current transformer core is formed remanent magnetism, increases the error of current transformer further.
Common metering low-voltage current mutual inductor conventional in an electrical network is test object, and its rated current is
500A, class of accuracy 0.2S level.Test indicate that this current transformer ratio difference under half-sinusoid and phase contrast all with
The increase primary current virtual value increases rapidly, and the ratio difference when rated current exceedes-80%, and phase contrast, more than 70, is led
Cause described current transformer can not normally use completely.
In order to overcome the problems referred to above, current transformer is made still to be able to normal work in the case of containing bigger DC component
Make, it is necessary to improve the anti-saturation ability of current transformer core, therefore generally the material of magnetic core is improved, such as Chinese patent
Invention CN102820127A discloses a kind of anti-direct-current magnetic core for current transformer and preparation method of current transformer with same, logical
Cross on magnetic core, be provided with an air gap not running through whole core cross section so that magnetic core can be considered the magnetic core by band air gap with without
The magnetic core superposition of air gap is formed, and utilizes not open the part of air gap to meet the required precision under normal condition, utilizes and have air gap
Part meets transformer required precision under the conditions of applying DC component.Although above-mentioned anti-DC current transformer can conduct
The current sampling element of electric energy meter, uses inside electric energy meter, reaches the purpose of anti-direct current impact, but as independent measurement
When Current Transformer is arranged in power system, often because the system failure or switching manipulation have the biggest overcurrent and flow through
Winding, so that secondary loop current becomes big, causes connect instrument and meter to be impacted by big electric current.
Utility model content
To this end, technical problem to be solved in the utility model is to overcome anti-DC current mutual inductance described in prior art
Device is difficult to meet the problem that the protection of secondary instrument and meter requires, thus provides a kind of and make current transformer meet secondary meter
The anti-DC measurement Current Transformer that protection requires.
For solving above-mentioned technical problem, one of the present utility model anti-DC measurement Current Transformer, described electric current is mutual
Sensor is cascaded by first order anti-saturation coil and second level speed saturable inductor and forms, the primary of described first order anti-saturation coil around
Group connects primary current input terminal, and the secondary windings of described first order anti-saturation coil connects described second level speed saturable inductor
Armature winding, the secondary windings connecting secondary current output terminal of described second level speed saturable inductor.
In an embodiment of the present utility model, the magnetic core of described first order anti-saturation coil uses Fe-based amorphous iron core
Or air-gap iron core.
In an embodiment of the present utility model, the magnetic core of described first order anti-saturation coil uses by microcrystalline iron core
The double-iron core structure formed with Fe-based amorphous iron core or air-gap iron core.
In an embodiment of the present utility model, the secondary windings of described first order anti-saturation coil and armature winding
Turn ratio is equal to a rated current and secondary rated transformation ratio.
In an embodiment of the present utility model, the magnetic core of described second level speed saturable inductor uses ultracrystallite or slope
The not ferromagnetic material of alloy.
In an embodiment of the present utility model, the rated current of described second level speed saturable inductor is 1A or 5A,
Turn ratio is 1:1.
Technique scheme of the present utility model has the advantage that compared to existing technology
Anti-DC measurement Current Transformer described in the utility model, uses first order anti-saturation coil and second level speed to satisfy
Cascading with coil, it can normally work when DC content is higher, and the electric current of secondary output simultaneously meets wanting of instrument security current
Ask, may be installed in the circuit that DC component in electrical network is higher and use as current transformer for metering, it addition, use conventional mutual
The core material of sensor and manufacturing process, simple in construction, low cost, it is simple to safeguard, it is simple to popularization and application on a large scale.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, it is embodied as below according to of the present utility model
Example also combines accompanying drawing, is described in further detail this utility model, wherein
Fig. 1 is the schematic diagram of anti-DC measurement Current Transformer described in the utility model.
Detailed description of the invention
Refer to shown in Fig. 1, the present embodiment provide a kind of anti-DC measurement Current Transformer, described current transformer by
First order anti-saturation coil 10 and second level speed saturable inductor 20 cascade composition, the primary of described first order anti-saturation coil 10 around
Group 11 connection primary current input terminal, the secondary windings 12 of described first order anti-saturation coil 10 connects described second level speed and satisfies
With the armature winding 21 of coil 20, the secondary windings 22 connecting secondary current output terminal of described second level speed saturable inductor 20.
Above-mentioned is core technology field described in the utility model, anti-DC measurement Current Mutual Inductance described in the utility model
Device, described current transformer is cascaded by first order anti-saturation coil 10 and second level speed saturable inductor 20 and forms, thus has relatively
Strong anti-DC capability, overcomes conventional current transformer easily by DC component influence, causes ratio difference and phase contrast drastically to increase
Big shortcoming, still is able to use as metering transformer when primary current is containing DC component, described first order anti-saturation line
The armature winding 11 of circle 10 connects primary current input terminal, the armature winding 11 of described first order anti-saturation coil 10 resist
DC component in primary current, the secondary windings 12 of described first order anti-saturation coil connects described second level speed saturable inductor
The armature winding 21 of 20, is only transferred to the armature winding of described second level speed saturable inductor 20 the most accurately by AC compounent
On 21, the armature winding 21 of described second level speed saturable inductor 20 is when an alternating current reaches the security current limit value specified
Take the lead in saturated, the secondary windings 22 connecting secondary current output terminal of described second level speed saturable inductor 20, when the system failure or
Switching manipulation produces the biggest overcurrent when flowing through a winding, it is possible to the instrument and meter that effectively Protection secondary circuit is connect from
The impact of big electric current, makes the secondary current of output meet the requirement of instrument security current, thus it is excessive to have restriction secondary current
Ability, it is simple to be arranged in the circuit that DC component in electrical network is higher and use as current transformer for metering.
In the present embodiment, according to the accuracy requirement of anti-DC current transformer, design described first order anti-saturation coil
The core material of 10 and structure；Accuracy is 3 grades or the current transformer of 5 grades, the magnetic core of described first order anti-saturation coil 10
Use Fe-based amorphous iron core, air-gap iron core；The current transformer that accuracy is 1 grade 0.2 grade, described first order anti-saturation coil
Magnetic core uses the double-iron core structure being made up of microcrystalline iron core and Fe-based amorphous iron core or air-gap iron core such that it is able to opposing is once
The impact of DC component in electric current, makes current transformer meet anti-DC performance requirement, advantageously ensures that saturation induction density
Height, can normally work containing in the case of DC component in primary current.
It addition, according to the rated current of described current transformer, rated voltage, nominal transformation ratio, rated sencondaryload, error
The technical requirements such as limit value, use the error calculation formula of current transformer, and the excitation curve of selected core material, meter
Calculate core section and the size of described first order anti-saturation coil 10.
Described first order anti-saturation coil 10 is priority coiling secondary windings 12 and armature winding 11 on magnetic core, when once electric
When flowing bigger, armature winding 11 can use the mode of punching, and the secondary windings 12 of described first order anti-saturation coil 10 is along iron core
Uniformly coiling 100 circle.The secondary windings 12 of described first order anti-saturation coil 10 and the turn ratio of armature winding 11 are equal to once
Rated current and secondary rated transformation ratio.
The magnetic core of described second level speed saturable inductor 20 uses ultracrystallite or the ferromagnetic material of permalloy.Above-mentioned ferromagnetic
When material is as magnetic core, not only initial permeability is high, and saturation induction density is little, reaches the security personnel of regulation at primary current
During current limit, second level iron core takes the lead in saturated, so that the secondary current of output meets the requirement of instrument security current.
The rated current of described second level speed saturable inductor 20 is 1A or 5A, and turn ratio is 1:1.With ultracrystallite or perm
Alloy material, as the iron core of second level speed saturable inductor 20, selects suitable sectional area and number of ampere turns, makes described second level speed
The saturable inductor 20 error under output-current rating and rated load meets the accuracy requirement of current transformer, and when defeated
Enter electric current and reach during instrument security current the combination misalignment of described second level speed saturable inductor 20 not less than 10%.
In the present embodiment, the main technical requirements of the anti-DC current transformer of described twin-stage is: running voltage 380V, specified
Primary current is 500A, and rated secondary current is 5A, and rated sencondaryload is 5VA, and the lower class of accuracy of exchange is 0.2S level, just
Under string half-wave, class of accuracy is 1 grade, and Safety factor is 5.
According to the regulation of national metrological verification regulations JJG 1021-2007 " electric power mutual-inductor ", measure described twin-stage electric current
Transformer error under industrial frequency AC, measurement result shows that described transformer meets 0.2S level requirement under exchange.At sine
Under the conditions of half-wave, using LEM ITZ type Zero flux sensor as reference standard, use numeral based on precision data acquisition technique
Change mutual-inductor tester as error measuring means, after the measured signal of reference standard signal and above-mentioned transformer is sampled with from
Scattered Fourier transformation resolves into first-harmonic and harmonic signal, then calculates ratio difference (f) and the phase contrast (δ) of fundamental signal.Survey
Amount result shows that described transformer meets 1 grade of requirement under half-sinusoid.Indirect method in GB 20840.2 regulation is measured described
The instrument security current of two-stage current transformer, meets the requirement that Safety factor is 5.
Obviously, above-described embodiment is only for clearly demonstrating example, the not restriction to embodiment.For
For those of ordinary skill in the field, the change of other multi-form can also be made on the basis of the above description or become
Dynamic.Here without also cannot all of embodiment be given exhaustive.And the obvious change thus extended out or change
Among the dynamic protection domain still in this utility model creation.
Claims (6)
1. an anti-DC measurement Current Transformer, it is characterised in that: described current transformer is by first order anti-saturation coil
With second level speed saturable inductor cascade composition, the armature winding of described first order anti-saturation coil connects primary current input
Son, the armature winding of the secondary windings connection described second level speed saturable inductor of described first order anti-saturation coil, described second
The secondary windings connecting secondary current output terminal of level speed saturable inductor.
Anti-DC measurement Current Transformer the most according to claim 1, it is characterised in that: described first order anti-saturation line
The magnetic core of circle uses Fe-based amorphous iron core or air-gap iron core.
Anti-DC measurement Current Transformer the most according to claim 1, it is characterised in that: described first order anti-saturation line
The magnetic core of circle uses the double-iron core structure being made up of microcrystalline iron core and Fe-based amorphous iron core or air-gap iron core.
4. according to the anti-DC measurement Current Transformer described in Claims 2 or 3, it is characterised in that: the described first order is anti-full
It is equal to a rated current and secondary rated transformation ratio with the secondary windings of coil and the turn ratio of armature winding.
Anti-DC measurement Current Transformer the most according to claim 1, it is characterised in that: described second level speed saturated line
The magnetic core of circle uses ultracrystallite or the ferromagnetic material of permalloy.
Anti-DC measurement Current Transformer the most according to claim 5, it is characterised in that: described second level speed saturated line
The rated current of circle is 1A or 5A, and turn ratio is 1:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620557283.4U CN205666125U (en) | 2016-06-08 | 2016-06-08 | Anti direct current measuring current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620557283.4U CN205666125U (en) | 2016-06-08 | 2016-06-08 | Anti direct current measuring current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205666125U true CN205666125U (en) | 2016-10-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620557283.4U Active CN205666125U (en) | 2016-06-08 | 2016-06-08 | Anti direct current measuring current transformer |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105957696A (en) * | 2016-06-08 | 2016-09-21 | 中国电力科学研究院 | Anti-DC measuring current transformer and preparation method |
| CN116500534A (en) * | 2023-06-27 | 2023-07-28 | 国网天津市电力公司营销服务中心 | DBI type current transformer DC resistance detection device and method |
-
2016
- 2016-06-08 CN CN201620557283.4U patent/CN205666125U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105957696A (en) * | 2016-06-08 | 2016-09-21 | 中国电力科学研究院 | Anti-DC measuring current transformer and preparation method |
| CN105957696B (en) * | 2016-06-08 | 2023-12-26 | 中国电力科学研究院 | Current transformer for DC resistance measurement and preparation method thereof |
| CN116500534A (en) * | 2023-06-27 | 2023-07-28 | 国网天津市电力公司营销服务中心 | DBI type current transformer DC resistance detection device and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |