CN106291038A - Secondary side current transformer not being afraid of open circuit and preparation method thereof - Google Patents
Secondary side current transformer not being afraid of open circuit and preparation method thereof Download PDFInfo
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- CN106291038A CN106291038A CN201610658109.3A CN201610658109A CN106291038A CN 106291038 A CN106291038 A CN 106291038A CN 201610658109 A CN201610658109 A CN 201610658109A CN 106291038 A CN106291038 A CN 106291038A
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- current transformer
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- open circuit
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- 238000002360 preparation method Methods 0.000 title abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000004080 punching Methods 0.000 claims abstract description 11
- 239000011347 resin Substances 0.000 claims abstract description 9
- 229920005989 resin Polymers 0.000 claims abstract description 9
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- 238000005266 casting Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 10
- 238000004804 winding Methods 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000009826 distribution Methods 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
- 230000006698 induction Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses a kind of secondary side current transformer not being afraid of open circuit and preparation method thereof, the switching current transformer being electrically connected including bus bar side current transformer and of at least one punching；Described bus bar side current transformer is in order to sense bus current；The outfan of bus bar side current transformer is electrically connected to the primary coil terminals of switching current transformer；The output of described switching current transformer is in order to be connected to measurement meter, described switching current transformer is arranged at the side of bus bar side current transformer, switching current transformer and bus bar side current transformer and realizes being mechanically connected and electrical isolation by the resin cast therebetween.The present invention is equivalent to the output to bus bar side current transformer and regularly and connects a load preventing it from opening a way, can fundamentally be effectively prevented and stop the harm that secondary side open circuit causes, avoid the problem that second open circuit causes product to explode, safe and reliable, it is ensured that person equipment safety.
Description
Technical field
The present invention relates to a kind of secondary side current transformer not being afraid of open circuit and preparation method thereof.
Background technology
In each link of power system, including generating, power transformation, transmission of electricity, distribution and electricity consumption, it is required for circuit is surveyed
Measure, protect and control (hereinafter referred to as observing and controlling).But size of current great disparity in circuit, have to several Wan An from several peaces, these electricity
Stream needs to be converted to the electric current that comparison is unified, and additionally the voltage on circuit is the highest, if direct observing and controlling is abnormally dangerous
's.The effect of current transformer (Current transformer is called for short CT) is primary current bigger for numerical value can be passed through
Certain no-load voltage ratio is converted to the secondary current that numerical value is less, is used for carrying out protecting, the purposes such as measurement.If no-load voltage ratio is the electricity of 400/5
Current transformer, can be changed into the electric current that reality is 400A the electric current of 5A.In addition to the effect playing current transformation, also act as electricity
Gas buffer action.
Current transformer is made up of the iron core closed and winding.Its umber of turn is little, in reality often only
Having a circle, namely punching and mistake, go here and there in needing the circuit of electric current measured, therefore it often has whole electric current streams of circuit
Crossing, secondary side turn ratio is more, is serially connected in the equipment such as measuring instruments and protective loop.
Current transformer is when normally working, and its secondary circuit is Guan Bi all the time, because it is secondary to be connected on current transformer
The impedance of the instrument coil on coil is the least, is equivalent to run under secondary coil short-circuit condition.Transformer secondary coil terminal powers on
Pressure only several volts.Thus the magnetic flux in iron core is the least.Although primary coil magnetomotive force can reach hundreds of peace or thousands of ampere-turn
Or it is bigger.Operating secondary loop of mutual inductor does not allow open circuit.Otherwise can produce high voltage at the two ends of open circuit to jeopardize
Person equipment safety, or make current transformer generate heat.
Time properly functioning, owing to the impedance of Secondary Winding is the least, produced by primary current, magnetomotive force major part is by secondary
The magnetomotive force that electric current produces is compensated, and total magnetic flux density is little, the electromotive force of Secondary Winding sensing also not quite, typically not over
Tens volts.When secondary circuit is opened a way, impedance infinitely increases, secondary current vanishing, the also vanishing of Secondary Winding magnetomotive force, and
Once winding current does not diminishes with second open circuit, loses the magnetomotive compensating action of Secondary Winding, and a magnetomotive force is very
Greatly, being completely used for excitation, resultant flux increases suddenly a lot of times, and the magnetic circuit height making iron core is saturated, now primary current
All becoming exciting current, produce the highest electromotive force in Secondary Winding, its peak value is up to several kilovolts of volts the most up to ten thousand, prestige
Coerce personal safety or cause instrument, protection device, transformer secondary insulating to damage.
Further, since the height of magnetic circuit is saturated, making magnetic induction suddenly increase, in iron core, magnetic hysteresis and eddy-current loss are drastically
Rise, can cause that iron core is overheated even burns current transformer.So in Yun Hanging when needs maintenance, verification secondary meter, must
First by secondary winding in current transformer or loop short circuit, then must carry out disassembling section, secondary loop of mutual inductor can not be installed
Fuse.Solve the existing protective measure of Current Transformer Secondary side output loop open circuit, substantially have following several:
The first, use the pressure cell such as varistor, gas-discharge tube, when Current Transformer Secondary side, output loop is opened
Lu Shi, once open-circuit voltage reaches the operation voltage of pressure-sensitive device, and pressure-sensitive device turns on, and makes output voltage control at pressure-sensitive electricity
Pressure.But, the conducting voltage of pressure-sensitive device high (more than tens volts), lasting conveyance capacity are little, and the electric current used on circuit is mutual
Sensor, the pressure-sensitive device that its specified output is substantially under 5A, prior art is only possible in the range of millisecond (ms) level continue
Crossing the electric current that stream is the biggest, and current transformer output loop is once opened a way, the persistent period is unlikely to be ms level.Therefore, pressure
Sensing device is protected, it is easy to punctures and forms permanent conducting, it is necessary to changes device and could recover transformer output loop
Normal work, or directly burn and do not have protective effect.
The second, when utilizing Current Transformer Secondary side output loop open circuit, once open-circuit voltage reaches certain value, by one
The individual coil being attempted by two outfans attracts spring tripping mechanism, and tripping mechanism action makes contact short, thus reaches protection and make
With.Owing to coil is attempted by two outfans of transformer, when transformer normally works, coil itself inevitably to flow through one
The electric current of partial mutual inductance device secondary side, this portion of electrical current does not flow through the detection equipment that should need to flow through, thus sets to detection
For bringing obvious error；Its two, mechanical mechanism is slow in one's movements, and during transformer output open circuit, and voltage rises quickly (us level),
Do not play a protective role, and outside accident occurs already.
The third, outfan install a relay, the contact of relay is connected to the two ends of outfan, manipulation fill
Put control relay to open and close, realize the protection of output loop of current transformer with this.Need manual intervention completely, for
Unexpected open circuit, does not has protective effect at all.
Chinese Patent Application No. 201210196247.6, discloses a kind of current transformer over-voltage protection method and device,
The present invention relates to a kind of current transformer over-voltage protection method and device, described method is to gather the electricity of Current Transformer Secondary side
Stream signal；The current signal collected is converted to voltage signal contrast with protection value set in advance, it is judged that described electricity
Whether current transformer secondary side is open circuit；When the voltage signal after conversion is more than described protection value set in advance, short circuit institute
State secondary loop of mutual inductor, when the voltage signal after conversion is not more than described protection value set in advance, recover described
The normal connection status of current transformer；Described device includes sampling unit, main control unit, pressure limited protection circuit and open-circuit-protection
Action element, the lead-out terminal of described open-circuit-protection action element is connected between the lead-out terminal of described current transformer.This
Invention uses aptitude manner to be controlled, and uses mechanical switch to complete open-circuit-protection simultaneously, it is to avoid electronics unit under prior art
The impact that whole circuit is caused by the heating of device.
The present invention and above scheme and prior art thereof, be all that second open circuit for current transformer is made afterwards
Remedial measure, fails to tackle the problem at its root.
Summary of the invention
The technical problem to be solved in the present invention is: provide current transformer and making side thereof that a kind of secondary side is not afraid of open circuit
Method, can not only ensure the precision measured, and, it is possible to fundamentally it is effectively prevented the various danger that the open circuit of secondary side causes
Evil.
The technical scheme of the technical problem to be solved in the present invention is:
Secondary side is not afraid of the current transformer of open circuit, including the bus bar side current transformer of at least one punching and one
The switching current transformer being electrically connected；Described bus bar side current transformer is in order to sense bus current；Bus bar side electric current
The outfan of transformer is electrically connected to the primary coil terminals of switching current transformer；Described switching current transformer defeated
Going out to be connected to measurement meter, described switching current transformer is arranged at the side of bus bar side current transformer, switching current
Transformer and bus bar side current transformer realize being mechanically connected and electrical isolation by the resin cast therebetween.
Preferably, described bus bar side current transformer is two, and described switching current transformer is two, for biphase mother
The measurement of line current, the outfan of bus bar side current transformer is respectively and electrically connected to the primary coil of switching current transformer and connects
Line end.
Preferably, described bus bar side current transformer is three, and described switching current transformer is three, female for three-phase
The measurement of line current, the outfan of bus bar side current transformer is respectively and electrically connected to the primary coil of switching current transformer and connects
Line end.
The present invention is not afraid of the manufacture method of the current transformer of open circuit based on a kind of secondary side, comprises the steps；
1st step: conventional, the punching bus bar side current transformer of coiling phase strain ratio；
2nd step: conventional, coiling switching current transformer；
3rd step: the output electric property of bus bar side current transformer is connected to the primary coil wiring of switching current transformer
End；
4th step: bus bar side current transformer and switching current transformer are kept at a certain distance away and is positioned in casting die,
Conventional, carry out vacuum stirring and the casting of resin, and follow-up dry；
5th step: the demoulding.
Preferably, in described step 2, described switching current transformer is 5A/5A type.
Preferably, in described step 4, described switching current transformer is arranged at the lower section of bus bar side current transformer.
The excellent effect of the present invention:
The secondary side of the present invention is not afraid of the current transformer of open circuit, is provided with to sense bus current bus bar side Current Mutual Inductance
Device, and at the rear side of bus bar side current transformer and connect the primary coil of a switching current transformer, switching current transformer
The resistance of primary coil less, be equivalent to the output to bus bar side current transformer and regularly and connect one and prevent it from opening a way
Load, therefore can guarantee that the output of bus bar side current transformer does not haves high-tension situation momently, it is possible to from
Fundamentally it is effectively prevented and stops secondary side and open a way the harm that causes, it is to avoid second open circuit causes the problem that product explodes,
Safe and reliable, it is ensured that person equipment safety.
Accompanying drawing explanation
Accompanying drawing described herein, in order to provide a further understanding of the present invention, constitutes the part of the present patent application,
The schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
Accompanying drawing 1 is the electrical connection schematic diagram of an embodiment of the present invention；
Accompanying drawing 2 is the structural representation of an embodiment of the present invention.
In figure:
1, bus bar side current transformer,
2, switching current transformer,
3, current bus bar,
4, resin,
5, bus bar side current transformer center cavity,
6, bus bar side current transformer lifting nut,
7, lead-in wire,
8, switching current transformer lifting nut.
Detailed description of the invention
The technology contents of the present invention is described below by way of particular specific embodiment, and those skilled in the art can be by this theory
The content that bright book discloses understands further advantage and effect of the present invention easily.The present invention also can be by other different concrete reality
Executing example implemented or apply, the every details in this specification also can be based on different viewpoints and application, without prejudice to this
Various modification and change is carried out under bright spirit.
Below in conjunction with accompanying drawing, the present invention is further detailed explanation.
Furthermore, it is necessary to explanation, unless stated otherwise or point out, otherwise the term in description " first ", " the
Two ", the description such as " the 3rd ", " A phase ", " B phase ", " C phase " is used only for each assembly in differentiation description, element, step, only
Merely to describe conveniently waits rather than for representing that the logical relation between each assembly, element, step or order are closed
Systems etc., are not concrete particularly appointment.
In order to solve from source, the various adverse consequencess that Current Transformer Secondary side open circuit brings, the secondary side of the present invention
Not being afraid of the current transformer of open circuit, be made that creative conceptual design, see Fig. 1, the design of the present invention includes at least
The bus bar side current transformer 1 of one punching and a switching current transformer 2 being electrically connected；The bus of punching
Side current transformer 1 uses routine techniques to carry out coiling, and described bus bar side current transformer 1 is in order to sense bus current.See
Fig. 1, bus bar side current transformer center cavity 5 is through current bus bar 3, and described current bus bar 3 is serially connected with in main line.Described mother
Line side current transformer 1 is connected by lead-in wire 7 and switching current transformer 2.
The described switching current transformer being electrically connected by bus bar side current transformer 1 and of a punching
The secondary side of 2 compositions is not afraid of the current transformer of open circuit, is only used for the measurement of a phase bus current.
Based on above-mentioned thought, for expanded application, described bus bar side current transformer is two, described switching current
Transformer is two, the outfan of bus bar side current transformer respectively with switching current transformer input connecing, so form
Secondary side be not afraid of the current transformer of open circuit and may be used for the measurement of biphase bus current.
Further, if described bus bar side current transformer is three, described switching current transformer is three, bus bar side
The outfan of current transformer is not afraid of the electricity of open circuit with switching current transformer input connecing, the so secondary side of composition respectively
Current transformer may be used for the measurement of three-phase bus electric current.
Switching current transformer 2 is to have identical no-load voltage ratio or the current transformer of different no-load voltage ratio, conventional, switching current is mutual
Sensor is 5A/5A type.In order to by measuring accuracy, switching current transformer 2 can use the high-precision current of routine techniques mutual
Sensor.Such as can use the current transformer of 0.1 class precision.
Conventional, high precision current transformer is made up of winding, a Secondary Winding.5/5 type or 1/1 type electricity can be carried out
Flow ratio self-correcting.
Precision current transformer iron core employing high permeability soft magnetic material roll-forming, high temperature protection heat treatment, one or two times
Coil high-strength polyester enamel-covered wire, and with absorbance very low insulation material coiling, coil surface recoat processes, and lead end is led
The enough contacts area of electric pole, it is ensured that stable performance is safe and reliable to operation.It is applicable to research unit, test chamber, factory, the magnitude of current
Value transmission, precision current measurement, standard mutual inductor.
In order to prevent the accident of the outfan of bus bar side current transformer 1 from opening a way, described bus bar side current transformer 1 defeated
Go out end and be electrically connected to the primary coil terminals of switching current transformer 2；The output of described switching current transformer 2 is in order to even
It is connected to measurement meter.The resistance of the primary coil of described switching current transformer 2 is less, is attempted by bus bar side current transformer 1
Outfan, be equivalent to the outfan to bus bar side current transformer 1 and connect a fixing load, and then, the most just from all
On solve the problem that the outfan of bus bar side current transformer 1 is surprisingly opened a way.
In terms of installation and internal placement, described switching current transformer 2 is arranged at the one of bus bar side current transformer 1
Side, switching current transformer 2 and bus bar side current transformer 1 realize being mechanically connected by the resin 4 cast therebetween and electrically every
From.The high intensity of resin 4 and excellent electrical specifications, it is achieved that bus bar side current transformer 1 and the machine of switching current transformer 2
Tool connects and electrical isolation.
Present invention theory based on above-mentioned innovation, and then also disclose that a kind of secondary side is not afraid of the current transformer of open circuit
Manufacture method, comprises the steps；
1st step: conventional, the punching bus bar side current transformer 1 of coiling phase strain ratio；
2nd step: conventional, coiling switching current transformer 2；
3rd step: the primary coil that the output electric property of bus bar side current transformer 1 is connected to switching current transformer 2 is connect
Line end；
4th step: bus bar side current transformer and switching current transformer are kept at a certain distance away and is positioned in casting die,
Conventional, carry out vacuum stirring and the casting of resin, and follow-up dry；
5th step: the demoulding.
The switching current transformer being electrically connected with bus bar side current transformer 1 and one of a punching above
The secondary sides of 2 compositions have carried out the description of manufacture method, for having two or three as a example by not being afraid of the current transformer of open circuit
The electric current that the secondary side that bus bar side current transformer 1 and the switching current transformer 2 being electrically connected form is not afraid of open circuit is mutual
Sensor, can be in this, as reference.
Preferably, in described step 2, described switching current transformer is 5A/5A type.
Preferably, in described step 4, described switching current transformer 2 is arranged at the lower section of bus bar side current transformer 1.
See Fig. 2, bus bar side current transformer 1 is provided with bus bar side current transformer lifting nut 6, at switching current
Transformer 2 is provided with switching current transformer lifting nut 8, and it positions for the installation at mutual-inductor mould.
Although this patent is explained with reference to preferred embodiment and accompanying drawing, but above-mentioned explanation should be regarded as illustrative
And non-limiting, change that those skilled in the art is made according to the spirit of the present invention and amendment, the guarantor of this patent all should be belonged to
Protect scope.
Claims (6)
1. secondary side is not afraid of the current transformer of open circuit, it is characterised in that:
The switching current transformer being electrically connected including bus bar side current transformer and one of at least one punching；
Described bus bar side current transformer is in order to sense bus current；
The outfan of bus bar side current transformer is electrically connected to the primary coil terminals of switching current transformer；
The output of described switching current transformer in order to be connected to measurement meter,
Described switching current transformer is arranged at the side of bus bar side current transformer, switching current transformer and bus bar side electric current
Transformer realizes being mechanically connected and electrical isolation by the resin cast therebetween.
A kind of secondary side the most according to claim 1 is not afraid of the current transformer of open circuit, it is characterised in that:
Described bus bar side current transformer is two, and described switching current transformer is two, for the survey of biphase bus current
Amount, the outfan of bus bar side current transformer is respectively and electrically connected to the primary coil terminals of switching current transformer.
A kind of secondary side the most according to claim 1 is not afraid of the current transformer of open circuit, it is characterised in that:
Described bus bar side current transformer is three, and described switching current transformer is three, for the survey of three-phase bus electric current
Amount, the outfan of bus bar side current transformer is respectively and electrically connected to the primary coil terminals of switching current transformer.
4. be not afraid of the manufacture method of the current transformer of open circuit according to a kind of secondary side described in claim 1 or 2 or 3, it is special
Levy and be:
Comprise the steps；
1st step: conventional, the punching bus bar side current transformer of coiling phase strain ratio；
2nd step: conventional, coiling switching current transformer；
3rd step: the output electric property of bus bar side current transformer is connected to the primary coil terminals of switching current transformer；
4th step: bus bar side current transformer and switching current transformer are kept at a certain distance away and is positioned in casting die, conventional
, carry out vacuum stirring and the casting of resin, and follow-up dry；
5th step: the demoulding.
A kind of secondary side the most according to claim 4 is not afraid of the manufacture method of the current transformer of open circuit, it is characterised in that:
In described step 2, described switching current transformer is 5A/5A type.
A kind of secondary side the most according to claim 4 is not afraid of the manufacture method of the current transformer of open circuit, it is characterised in that:
In described step 4, described switching current transformer is arranged at the lower section of bus bar side current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658109.3A CN106291038A (en) | 2016-08-12 | 2016-08-12 | Secondary side current transformer not being afraid of open circuit and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658109.3A CN106291038A (en) | 2016-08-12 | 2016-08-12 | Secondary side current transformer not being afraid of open circuit and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106291038A true CN106291038A (en) | 2017-01-04 |
Family
ID=57668964
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610658109.3A Pending CN106291038A (en) | 2016-08-12 | 2016-08-12 | Secondary side current transformer not being afraid of open circuit and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106291038A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070126411A1 (en) * | 2005-12-01 | 2007-06-07 | Falco, Ltd. | Current transformer with impedance compensation and associated methods |
| CN101188355A (en) * | 2007-11-29 | 2008-05-28 | 北京四方继保工程技术有限公司 | Method for converting the end electric screen current of mutual inductor into line voltage and insulation line monitoring device |
| CN202126455U (en) * | 2011-06-30 | 2012-01-25 | 山东亿玛信诺电气有限公司 | Multifunctional combined electric power metering box |
| CN202383229U (en) * | 2011-12-31 | 2012-08-15 | 山东亿玛信诺电气有限公司 | Output open circuit monitoring device of current transformer |
| CN202854206U (en) * | 2012-08-03 | 2013-04-03 | 李会新 | Multi-tap type current transformer with voltage not less than 110kV |
| CN204011024U (en) * | 2014-07-09 | 2014-12-10 | 北京蓝派克电力科技有限公司 | A kind of novel electronic type zero sequence current transformer |
| CN105759099A (en) * | 2015-11-16 | 2016-07-13 | 彭冬青 | Intelligent electronic current transformer |
| CN205898871U (en) * | 2016-08-12 | 2017-01-18 | 山东亿玛信诺电气有限公司 | Current transformer who opens a way is not afraid of to secondary side |
-
2016
- 2016-08-12 CN CN201610658109.3A patent/CN106291038A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070126411A1 (en) * | 2005-12-01 | 2007-06-07 | Falco, Ltd. | Current transformer with impedance compensation and associated methods |
| CN101188355A (en) * | 2007-11-29 | 2008-05-28 | 北京四方继保工程技术有限公司 | Method for converting the end electric screen current of mutual inductor into line voltage and insulation line monitoring device |
| CN202126455U (en) * | 2011-06-30 | 2012-01-25 | 山东亿玛信诺电气有限公司 | Multifunctional combined electric power metering box |
| CN202383229U (en) * | 2011-12-31 | 2012-08-15 | 山东亿玛信诺电气有限公司 | Output open circuit monitoring device of current transformer |
| CN202854206U (en) * | 2012-08-03 | 2013-04-03 | 李会新 | Multi-tap type current transformer with voltage not less than 110kV |
| CN204011024U (en) * | 2014-07-09 | 2014-12-10 | 北京蓝派克电力科技有限公司 | A kind of novel electronic type zero sequence current transformer |
| CN105759099A (en) * | 2015-11-16 | 2016-07-13 | 彭冬青 | Intelligent electronic current transformer |
| CN205898871U (en) * | 2016-08-12 | 2017-01-18 | 山东亿玛信诺电气有限公司 | Current transformer who opens a way is not afraid of to secondary side |
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Application publication date: 20170104 |
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