CN209198521U - Zero-magnetic-flux high-precision zero-sequence current transformer - Google Patents
Zero-magnetic-flux high-precision zero-sequence current transformer Download PDFInfo
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- CN209198521U CN209198521U CN201821682133.1U CN201821682133U CN209198521U CN 209198521 U CN209198521 U CN 209198521U CN 201821682133 U CN201821682133 U CN 201821682133U CN 209198521 U CN209198521 U CN 209198521U
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- 238000004804 winding Methods 0.000 claims abstract description 108
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 51
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000001447 compensatory effect Effects 0.000 claims description 42
- 230000004907 flux Effects 0.000 claims description 22
- 230000010363 phase shift Effects 0.000 claims description 18
- 238000013461 design Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 13
- 239000003990 capacitor Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 241001290864 Schoenoplectus Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The utility model discloses a zero magnetic flow high accuracy zero sequence current transformer, including mutual-inductor core, mutual-inductor winding and compensating circuit, the mutual-inductor core includes main iron core and auxiliary core, and the mutual-inductor winding includes secondary current winding, zero magnetic flow detection winding and compensation winding, and zero magnetic flow detection winding evenly winds on main iron core, and the compensation winding evenly winds on auxiliary core, has the main iron core of zero magnetic flow detection winding and has the auxiliary core of compensation winding and bonds side by side, and the secondary current winding evenly winds on main iron core and the auxiliary core after the bonding, and compensating circuit detects the winding with zero magnetic flow respectively, and the compensation winding links to each other. The utility model discloses an active zero magnetic flow compensation principle can eliminate exciting current to the influence of mutual-inductor precision, and fault identification and the required measurement accuracy of location when can satisfying the emergence high resistance ground connection, and can not reduce original zero sequence mutual-inductor's overload multiple, have realized the measurement to zero sequence current wide range high accuracy.
Description
Technical field
The utility model relates to a kind of mutual inductor, especially a kind of Zero flux high-precise zero-sequence current transformer belongs to electricity
Gas engineering technical field of electromagnetic measurement.
Background technique
In power distribution network, traditional electromagnetic type zero sequence transformer is generallyd use.Traditional electromagnetic type zero sequence transformer due to
The influence of exciting current, there are certain measurement errors, and when high resistance ground occurs for power distribution network, failure zero-sequence current very little makes
It obtains mutual inductor measuring accuracy of measurement further to decline, is difficult measurement accuracy needed for meeting fault identification and positioning.
Utility model content
Purpose of the utility model is to solve the defects of the above-mentioned prior art, provide a kind of Zero flux high-precision zero
Sequence current transformer, the mutual inductor can be applied to non_direct ground power distribution network, use active Zero flux compensation principle, can disappear
Influence except exciting current to transformer precision, the measurement essence needed for can satisfy fault identification when high resistance ground occurs and positioning
Degree, and the overload magnification of original zero sequence transformer will not be reduced, realize the measurement to zero-sequence current wide-range high-accuracy.
The purpose of this utility model can be reached by adopting the following technical scheme that:
A kind of Zero flux high-precise zero-sequence current transformer, including transformer iron core, mutual inductor winding and compensation circuit, institute
Stating transformer iron core includes main iron core and auxiliary iron core, the mutual inductor winding include secondary current winding, Zero-flux sensing around
Group and compensative winding, the Zero-flux sensing winding are uniformly wound on main iron core, and the compensative winding is uniformly wound in auxiliary
On iron core, the main iron core with Zero-flux sensing winding and the auxiliary iron core with compensative winding bond side by side, the secondary electricity
Stream winding be uniformly wound in bonding after main iron core and auxiliary iron core on, the compensation circuit respectively with Zero-flux sensing winding,
Compensative winding is connected.
Further, the compensation circuit includes error amplifying circuit, low-pass filter circuit, phase-shift circuit and compensative winding
Driving circuit, the error amplifying circuit, low-pass filter circuit, phase-shift circuit and compensative winding driving circuit are sequentially connected, institute
It states error amplifying circuit to be connected with Zero-flux sensing winding, the compensative winding driving circuit is connected with compensative winding.
Further, the error amplifying circuit includes the first operational amplifier, the forward direction of first operational amplifier
Input terminal is connected with Zero-flux sensing winding, and the output end of the first operational amplifier is connected with the input terminal of low-pass filter circuit.
Further, the low-pass filter circuit uses second order Butterworth lowpass wave circuit, and second order Bart is fertile hereby
Low-pass filter circuit includes second operational amplifier, the positive input of the second operational amplifier and error amplifying circuit
Output end is connected, and the output end of second operational amplifier is connected with the input terminal of phase-shift circuit.
Further, for the phase-shift circuit using integral phase-shift circuit, which includes third operation amplifier
The reverse input end of device, the third operational amplifier is connected with the output end of low-pass filter circuit, third operational amplifier
Output end is connected with the input terminal of compensative winding driving circuit.
Further, the compensative winding driving circuit uses V/I converting circuit structure, the V/I converting circuit structure packet
Four-operational amplifier, the 5th operational amplifier, the first triode and the second triode are included, first triode is NPN tri-
Pole pipe, second triode are PNP triode；
The positive input of the four-operational amplifier is connected with the output end of phase-shift circuit, four-operational amplifier
Reverse input end is connected with the output end of the 5th operational amplifier, the output end of four-operational amplifier by first diode with
The ground level of first triode is connected, and is connected by the second diode with the ground level of the second triode；5th operation is put
The positive input of big device is connected with compensative winding；The emitter of first triode and the emitter difference of the second triode
It is connected with compensative winding.
Further, the main iron core and auxiliary iron core are all made of soft magnetic materials and are made, main iron core and auxiliary iron core
It is that annular and size is identical.
Further, the number of turns of the secondary current winding is the design no-load voltage ratio of mutual inductor.
Further, when the rated value of mutual inductor secondary current is 1A, the number of turns of the Zero-flux sensing winding is two
10 times of primary current umber of turn；
When the rated value of mutual inductor secondary current is 5A, the number of turns of the Zero-flux sensing winding is secondary current winding
50 times of the number of turns.
Further, the number of turns of the compensative winding is identical as the number of turns of Zero-flux sensing winding.
The utility model have compared with the existing technology it is following the utility model has the advantages that
1, the zero sequence current mutual inductor of the utility model utilizes Zero flux compensation principle, eliminates zero sequence current mutual inductor excitation
Influence of the electric current to measurement accuracy, the measurement accuracy needed for can satisfy fault identification when high resistance ground occurs and positioning, and not
The overload magnification that original zero sequence transformer can be reduced realizes the high-acruracy survey to zero-sequence current in wider measurement range.
2, the utility model realizes high-precision New Method of Active Electronic Compensation using compensation circuit and compensative winding, keeps zero-sequence current mutual
The precision of sensor is not influenced by extraneous factor, is eliminated precision correction work compared to passive zero flux mutual inductor, is reduced dimension
Protect workload.
3, the essence that the zero sequence current mutual inductor of the utility model can guarantee 0.2 grade the 2%~120% of its rated range
Degree guarantees 5% precision in 10 times of rated current.
Detailed description of the invention
Fig. 1 is the Zero flux high-precise zero-sequence current transformer structural schematic diagram of the utility model embodiment 1.
Fig. 2 is the error amplifying circuit schematic diagram of the utility model embodiment 1.
Fig. 3 is the low-pass filter circuit and phase-shift circuit schematic diagram of the utility model embodiment 1.
Fig. 4 is the compensative winding driver circuit schematic diagram of the utility model embodiment 1.
Wherein, 1- compensation circuit, 2- main iron core, 3- auxiliary iron core, 4- secondary current winding, 5- Zero-flux sensing winding.
6- compensative winding, N1The number of turns of secondary current winding, N2The number of turns of Zero-flux sensing winding, N3The number of turns of compensative winding, U1-
First operational amplifier, U2A- second operational amplifier, U2B- third operational amplifier, U3A- four-operational amplifier, U3B-
5th operational amplifier, R1- first resistor, R2- second resistance, R3- 3rd resistor, the 4th resistance of R4-, the 5th resistance of R5-,
The 6th resistance of R6-, the 7th resistance of R7-, the 8th resistance of R8-, the 9th resistance of R9-, the tenth resistance of R10-, R11- eleventh resistor,
R12- twelfth resistor, R13- thirteenth resistor, C1- first capacitor, the second capacitor of C2-, C3- third capacitor, the 4th electricity of C4-
Hold, the first triode of Q1-, the second triode of Q2-, D1- first diode, the second diode of D2-.
Specific embodiment
The present invention will be further described in detail with reference to the embodiments and the accompanying drawings, but the implementation of the utility model
Mode is without being limited thereto.
Embodiment 1:
As shown in Figure 1, present embodiments providing a kind of Zero flux high-precise zero-sequence current transformer, which can
To be used for non_direct ground power distribution network, the transformation of main iron core Zero flux current ratio is realized using dynamic magnetic balance principle comprising
Transformer iron core, mutual inductor winding and compensation circuit 1, transformer iron core include main iron core 2 and auxiliary iron core 3, mutual inductor winding
Including secondary current winding 4, Zero-flux sensing winding 5 and compensative winding 6, the number of turns N of secondary current winding 41It indicates, zero magnetic
The number of turns N of logical detection winding 52It indicates, the number of turns N of compensative winding 63It indicates.
The main iron core 2 and auxiliary iron core 3 are all made of soft magnetic materials and are made, and main iron core and auxiliary iron core are annular
And size is identical, the main iron core 2 and 3 outer diameter of auxiliary iron core of the present embodiment are 150mm, internal diameter 110mm, with a thickness of
30mm。
The Zero-flux sensing winding 5 is uniformly wound on main iron core 2, and compensative winding 6 is uniformly wound in auxiliary iron core 3
On, the main iron core 1 with Zero-flux sensing winding 5 and the auxiliary iron core 3 with compensative winding 6 are bonded side by side, then will be secondary
Electric current winding 4 is uniformly wound on the main iron core 2 and auxiliary iron core 3 after bonding.
Further, the number of turns N of secondary current winding 41Equal to the design no-load voltage ratio of mutual inductor, 10 times of rated current are considered
Conveyance capacity, the present embodiment mutual inductor design no-load voltage ratio be 30, i.e. N1=30, secondary current winding 4 is more using three squares
The stock uniform coiling of enameled wire.
The rated value of the zero sequence current mutual inductor secondary current of the present embodiment is 5A, therefore the circle of Zero-flux sensing winding 5
Number N2It is 50 times of secondary current winding, i.e. N2=30*50=1500, Zero-flux sensing winding 5 are uniform using 0.6mm enameled wire
Coiling.
Further, the number of turns N of compensative winding 63With the number of turns N of Zero-flux sensing winding2It is identical, i.e. N3=N2=1500.
Compensative winding 6 uses the uniform coiling of 0.6mm enameled wire.
The compensation circuit 1 includes error amplifying circuit, low-pass filter circuit, phase-shift circuit and compensative winding driving electricity
Road, error amplifying circuit, low-pass filter circuit, phase-shift circuit and compensative winding driving circuit are sequentially connected, error amplifying circuit
It is connected with Zero-flux sensing winding 5, compensative winding driving circuit is connected with compensative winding 6.
As depicted in figs. 1 and 2, the error amplifying circuit includes the first operational amplifier U1, it is preferable that the first operation is put
Big device is designed using the ADA4625-1 low noise operational amplifier of AnalogDevice company, and first operational amplifier U1 is
JFET input amplifier, input impedance are high, and positive input is connected with Zero-flux sensing winding 5, reception Zero-flux sensing around
The current signal of group 5, output signal U o1 after processing advantageously reduce the electric current of Zero-flux sensing winding 5, error amplifying circuit
Amplification factor be 10 times, supply voltage be ± 12V.
Further, the error amplifying circuit of the present embodiment further includes first resistor R1, second resistance R2 and first capacitor
C1, from fig. 2 it can be seen that the reverse input end of the first operational amplifier U1 is grounded by second resistance R2, first capacitor C1
It being connect respectively at the both ends of first resistor R1, one end of first resistor R1 also connects one end in second resistance R2, reverse input end, and
The other end of one resistance R1 also connects the output end in the first operational amplifier U1.
As shown in FIG. 1 to 3, the low-pass filter circuit uses second order Butterworth lowpass wave circuit, cutoff frequency
For 2kHz, the overall bandwidth of zero sequence transformer is not significantly affected by while reducing High-frequency Interference.Low-pass filter circuit is put
Big multiple is 1 times, and supply voltage is ± 12V；Further, which includes that the second operation is put
Big device U2A, it is preferable that using the ADA4898-2 ultra-low noise Design of Amplifiers of AnalogDevice company, second fortune
The pink noise for calculating amplifier U2A is 0.9nV/Hz, can effectively reduce the overall noise of low-pass filter circuit, positive input
It is connected with the output end of the first operational amplifier U1, receives the signal Uo1 of the first operational amplifier U1 output.
Further, the low-pass filter circuit of the present embodiment further includes the 4th resistance R4, the 5th resistance R5, the second capacitor C2
With the 4th capacitor C4, it can be seen in figure 3 that the positive input of second operational amplifier U2A pass sequentially through the 4th resistance R4,
5th resistance R5 is connected with the output end of the first operational amplifier U1, the 4th resistance R4 of an end Jie of the second capacitor C2, the 5th
One end of resistance R5, another output end for terminating at second operational amplifier U2A of the second capacitor C2, the one of the 4th capacitor C4
Terminate the other end of the 5th resistance R5, the other end ground connection of the 4th capacitor C4.
As shown in FIG. 1 to 3, for the phase-shift circuit using integral phase-shift circuit, which includes third fortune
Calculate amplifier U2B, it is preferable that third operational amplifier U2B uses the ADA4898-2 ultra-low noise of AnalogDevice company
Design of Amplifiers, amplification factor are 10 times, and supply voltage is ± 12V, the reversed input of third operational amplifier U2B
End is connected with the output end of second operational amplifier U2A, receives the signal of second operational amplifier U2A output, and after treatment
Output signal U o2.
Further, the phase-shift circuit of the present embodiment further include 3rd resistor R3, the 6th resistance R6 and the 7th resistance R7 and
Third capacitor C3, it can be seen in figure 3 that the reverse input end of third operational amplifier U2B passes through the 6th resistance R6 and second
The output end of operational amplifier U2A is connected, and the positive input of third operational amplifier U2B is grounded by the 7th resistance R7, the
The both ends of three resistance R3 are connect respectively at the both ends of third capacitor C3, and one end of third capacitor C3 also connects the one of the 6th resistance R6
It holds, the positive input of third operational amplifier U2B, the other end of third capacitor C3 also connects third operational amplifier U2B's
Output end.
As shown in Figure 1 to 4, the compensative winding driving circuit uses V/I converting circuit structure, the V/I conversion circuit
Structure gain is 1V/A comprising four-operational amplifier U3A, the 5th operational amplifier U3B, the first triode Q1 and second
Triode Q2, four-operational amplifier U3A and the 5th operational amplifier U3B are all made of AnalogDevice company
ADA4898-2 ultra-low noise Design of Amplifiers, the first triode Q1 use 2SD1803 triode, are NPN triode,
Second triode Q2 uses 2SB1803 triode, is PNP triode, and two triodes are complementary triode, and the one or three
It is 5A that the maximum of pole pipe Q1 and the second triode Q2, which continue collector current, and pressure resistance is 50V.
The positive input of four-operational amplifier U3A and the output end of third operational amplifier U2B, receive third operation
The signal Uo2 of amplifier U2B output, the output of the reverse input end of four-operational amplifier U3A and the 5th operational amplifier U3B
End is connected, and the output end of four-operational amplifier U3A is connected by first diode D1 with the ground level of the first triode Q1, and
It is connected by the second diode D2 with the ground level of the second triode Q2, the positive input of the 5th operational amplifier U3B and compensation
Winding 6 is connected, and the emitter of the emitter of the first triode Q1 and the second triode Q2 are connected with compensative winding 6 respectively, to drive
Dynamic compensation compensative winding 6；Wherein, first diode D1 and the second diode D2 are all made of 1N4148 diode.
Further, the compensative winding driving circuit of the present embodiment further includes the 8th resistance R8, the 9th resistance R9, the tenth electricity
Hinder the reversed input of R10, eleventh resistor R11, twelfth resistor R12 and thirteenth resistor R13, four-operational amplifier U3A
End is also grounded by the 9th resistance R9, and the reverse input end of the 5th operational amplifier U3B is grounded by twelfth resistor R12, the
The output end of the reverse input end of an end Jie four-operational amplifier U3A of 13 resistance R13, the 5th operational amplifier U3B,
Another reverse input end for terminating at the 5th operational amplifier U3B of thirteenth resistor R13, the collector of the first triode Q1
+ 5V power supply is connect, the collector of the second triode Q2 connects -5V power supply, the current collection of a first triode Q1 of termination of the 8th resistance R8
Pole, the ground level of the anode of another termination first diode D1 of the 8th resistance R8, the first triode Q1, eleventh resistor R11's
The collector of one the second triode Q2 of termination, the cathode of another termination first diode D1 of eleventh resistor R11, the two or three
The forward direction of the ground level of pole pipe Q2, a termination of the tenth resistance R10, a 5th operational amplifier U3B of termination of the tenth resistance R10 is defeated
Enter end, the other end ground connection of the tenth resistance R10.
Embodiment 2:
The present embodiment is mainly characterized by: the rated value of mutual inductor secondary current is 1A, therefore Zero-flux sensing winding 5
The number of turns N2For 4 the number of turns N of secondary current winding110 times, i.e. N2=N3=10*10=100.Remaining is the same as embodiment 1.
In conclusion the utility model can be applied to non_direct ground power distribution network, use active Zero flux compensation former
Reason, can eliminate influence of the exciting current to transformer precision, needed for can satisfy fault identification when high resistance ground occurs and positioning
Measurement accuracy, and the overload magnification of original zero sequence transformer will not be reduced, realized to zero-sequence current wide-range high-accuracy
Measurement.
The above, only the utility model patent preferred embodiment, but the protection scope of the utility model patent is simultaneously
Not limited to this, anyone skilled in the art is in the range disclosed in the utility model patent, according to this
Technical solution and its utility model design of utility model patent are subject to equivalent substitution or change, belong to the utility model patent
Protection scope.
Claims (10)
1. a kind of Zero flux high-precise zero-sequence current transformer, which is characterized in that including transformer iron core, mutual inductor winding and benefit
Circuit is repaid, the transformer iron core includes main iron core and auxiliary iron core, and the mutual inductor winding includes secondary current winding, zero magnetic
Logical detection winding and compensative winding, the Zero-flux sensing winding are uniformly wound on main iron core, the compensative winding uniformly around
It is formed on auxiliary iron core, the main iron core with Zero-flux sensing winding and the auxiliary iron core with compensative winding bond side by side, institute
It states on main iron core and auxiliary iron core after secondary current winding is uniformly wound in bonding, the compensation circuit is examined with Zero flux respectively
Survey winding, compensative winding is connected.
2. a kind of Zero flux high-precise zero-sequence current transformer according to claim 1, which is characterized in that the compensation electricity
Road includes error amplifying circuit, low-pass filter circuit, phase-shift circuit and compensative winding driving circuit, the error amplifying circuit,
Low-pass filter circuit, phase-shift circuit and compensative winding driving circuit are sequentially connected, the error amplifying circuit and Zero-flux sensing
Winding is connected, and the compensative winding driving circuit is connected with compensative winding.
3. a kind of Zero flux high-precise zero-sequence current transformer according to claim 2, which is characterized in that the error is put
Big circuit includes the first operational amplifier, and the positive input of first operational amplifier is connected with Zero-flux sensing winding,
The output end of first operational amplifier is connected with the input terminal of low-pass filter circuit.
4. a kind of Zero flux high-precise zero-sequence current transformer according to claim 2, which is characterized in that the low pass filtered
Wave circuit uses second order Butterworth lowpass wave circuit, which includes the second operation amplifier
Device, the positive input of the second operational amplifier are connected with the output end of error amplifying circuit, second operational amplifier
Output end is connected with the input terminal of phase-shift circuit.
5. a kind of Zero flux high-precise zero-sequence current transformer according to claim 2, which is characterized in that the phase shift electricity
Road using integral phase-shift circuit, which includes third operational amplifier, the third operational amplifier it is reversed
Input terminal is connected with the output end of low-pass filter circuit, and the output end of third operational amplifier is defeated with compensative winding driving circuit
Enter end to be connected.
6. a kind of Zero flux high-precise zero-sequence current transformer according to claim 2, which is characterized in that it is described compensation around
Group driving circuit uses V/I converting circuit structure, which puts including four-operational amplifier, the 5th operation
Big device, the first triode and the second triode, first triode are NPN triode, and second triode is tri- pole PNP
Pipe；
The positive input of the four-operational amplifier is connected with the output end of phase-shift circuit, four-operational amplifier it is reversed
Input terminal is connected with the output end of the 5th operational amplifier, and the output end of four-operational amplifier passes through first diode and first
The ground level of triode is connected, and is connected by the second diode with the ground level of the second triode；5th operational amplifier
Positive input be connected with compensative winding；The emitter of the emitter of first triode and the second triode respectively with benefit
Winding is repaid to be connected.
7. a kind of Zero flux high-precise zero-sequence current transformer according to claim 1-6, which is characterized in that institute
It states main iron core and auxiliary iron core is all made of soft magnetic materials and is made, main iron core and auxiliary iron core are annular and the complete phase of size
Together.
8. a kind of Zero flux high-precise zero-sequence current transformer according to claim 1-6, which is characterized in that institute
The number of turns for stating secondary current winding is the design no-load voltage ratio of mutual inductor.
9. a kind of Zero flux high-precise zero-sequence current transformer according to claim 1-6, which is characterized in that when
When the rated value of mutual inductor secondary current is 1A, the number of turns of the Zero-flux sensing winding is the 10 of secondary current umber of turn
Times；
When the rated value of mutual inductor secondary current is 5A, the number of turns of the Zero-flux sensing winding is secondary current umber of turn
50 times.
10. a kind of Zero flux high-precise zero-sequence current transformer according to claim 1-6, which is characterized in that
The number of turns of the compensative winding is identical as the number of turns of Zero-flux sensing winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821682133.1U CN209198521U (en) | 2018-10-17 | 2018-10-17 | Zero-magnetic-flux high-precision zero-sequence current transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821682133.1U CN209198521U (en) | 2018-10-17 | 2018-10-17 | Zero-magnetic-flux high-precision zero-sequence current transformer |
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| CN209198521U true CN209198521U (en) | 2019-08-02 |
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ID=67408187
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| CN201821682133.1U Active CN209198521U (en) | 2018-10-17 | 2018-10-17 | Zero-magnetic-flux high-precision zero-sequence current transformer |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366883A (en) * | 2019-11-28 | 2020-07-03 | 横店集团东磁股份有限公司 | High-precision magnetic core loss test circuit and method |
| CN112164559A (en) * | 2020-09-03 | 2021-01-01 | 中冶天工集团有限公司 | Self-adaptive variable-range current transformer |
| CN112858986A (en) * | 2021-03-02 | 2021-05-28 | 中国电力科学研究院有限公司 | Current transformer's primary winding leakage current compensating circuit and check-up equipment |
| CN113075484A (en) * | 2021-03-30 | 2021-07-06 | 绍兴市质量技术监督检测院 | Remote intelligent metering quality monitoring system for electric vehicle charging equipment |
| CN113466526A (en) * | 2021-07-27 | 2021-10-01 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
| CN113687291A (en) * | 2021-08-24 | 2021-11-23 | 浙江大学 | Secondary side current compensation method and device of current transformer and electronic equipment |
| CN114089011A (en) * | 2021-11-30 | 2022-02-25 | 江苏科兴电器有限公司 | Zero magnetic flux current transformer |
| CN114113762A (en) * | 2021-10-28 | 2022-03-01 | 上海金智晟东电力科技有限公司 | Active zero magnetic flux sampling device |
| CN114284047A (en) * | 2022-03-04 | 2022-04-05 | 山西省机电设计研究院有限公司 | Open-close bus type high-precision zero-flux current transformer and error compensation method |
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2018
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111366883A (en) * | 2019-11-28 | 2020-07-03 | 横店集团东磁股份有限公司 | High-precision magnetic core loss test circuit and method |
| CN112164559A (en) * | 2020-09-03 | 2021-01-01 | 中冶天工集团有限公司 | Self-adaptive variable-range current transformer |
| CN112858986A (en) * | 2021-03-02 | 2021-05-28 | 中国电力科学研究院有限公司 | Current transformer's primary winding leakage current compensating circuit and check-up equipment |
| CN113075484A (en) * | 2021-03-30 | 2021-07-06 | 绍兴市质量技术监督检测院 | Remote intelligent metering quality monitoring system for electric vehicle charging equipment |
| CN113075484B (en) * | 2021-03-30 | 2023-04-28 | 绍兴市质量技术监督检测院 | Remote intelligent metering quality monitoring system for electric automobile charging equipment |
| CN113466526A (en) * | 2021-07-27 | 2021-10-01 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
| CN113466526B (en) * | 2021-07-27 | 2022-07-26 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
| CN113687291A (en) * | 2021-08-24 | 2021-11-23 | 浙江大学 | Secondary side current compensation method and device of current transformer and electronic equipment |
| CN114113762A (en) * | 2021-10-28 | 2022-03-01 | 上海金智晟东电力科技有限公司 | Active zero magnetic flux sampling device |
| CN114089011A (en) * | 2021-11-30 | 2022-02-25 | 江苏科兴电器有限公司 | Zero magnetic flux current transformer |
| CN114284047A (en) * | 2022-03-04 | 2022-04-05 | 山西省机电设计研究院有限公司 | Open-close bus type high-precision zero-flux current transformer and error compensation method |
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Effective date of registration: 20191224 Address after: 510530 Guangdong city of Guangzhou province Luogang District Science City Kexiang Road No. 11 Co-patentee after: China South Power Grid International Co.,Ltd. Patentee after: CHINA SOUTHERN POWER GRID Co.,Ltd. Address before: 510530 Building 3, 4, 5 and 3 of Building J1, 11 Kexiang Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee before: China South Power Grid International Co.,Ltd. |