CN204857428U - Current transformer - Google Patents
Current transformer Download PDFInfo
- Publication number
- CN204857428U CN204857428U CN201520469705.8U CN201520469705U CN204857428U CN 204857428 U CN204857428 U CN 204857428U CN 201520469705 U CN201520469705 U CN 201520469705U CN 204857428 U CN204857428 U CN 204857428U
- Authority
- CN
- China
- Prior art keywords
- mutual inductor
- current transformer
- comparison circuit
- winding number
- connects
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004804 winding Methods 0.000 claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 7
- 238000005259 measurement Methods 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
The utility model relates to an electric power system automation, concretely relates to current transformer, including mutual inductor, mutual inductor comprises closed iron core and winding, mutual inductor is equipped with two sets ofly, be a mutual inductor and the 2nd mutual inductor respectively, the secondary winding number of turns that a mutual inductor's the secondary winding number of turns and comparing of the primary winding number of turns are greater than the 2nd mutual inductor compares with the primary winding number of turns, a mutual inductor connects comparison circuit, the 2nd mutual inductor connects amplifier circuit, amplifier circuit connects comparison circuit, the problem of current transformer output distortion when the low -load is overcome to this equipment, improve the measurement accuracy, reduce the economic loss of electric wire netting.
Description
Technical field
The utility model relates to power system automatic field, is specifically related to a kind of current transformer.
Background technology
Current transformer principle is according to electromagnetic induction principle.Current transformer is made up of the iron core closed and winding.Its umber of turn is little; go here and there in the circuit needing the electric current measured; therefore it often has whole electric currents of circuit to flow through; secondary winding turn ratio is more; be serially connected in measuring instrument and protective loop, operationally, its secondary side circuit is closed to current transformer all the time; therefore the impedance of measuring instrument and protective loop series coil is very little, and the operating state of current transformer is close to short circuit.Current transformer is that primary side big current is converted to secondary side small area analysis to use, and secondary side can not be opened a way.When operation of current transformers, due to problems such as manufacturing process, a part of low load dead band may be there is, namely during low load, current transformer output and input disproportionate, export distortion, cause error in dipping.
Utility model content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: provide a kind of current transformer, and when overcoming underload, current transformer exports the problem of distortion, improves metering precision, reduces the economic loss of electrical network.
Current transformer described in the utility model, comprise mutual inductor, mutual inductor is made up of the iron core closed and winding, mutual inductor is provided with two groups, be respectively the first mutual inductor and the second mutual inductor, the secondary winding number of turn of the first mutual inductor is N1 with the ratio of a umber of turn, and the secondary winding number of turn of the second mutual inductor and the ratio of a umber of turn are that N2, N2 are greater than N1; First mutual inductor connects comparison circuit, and the second mutual inductor connects amplifying circuit, and amplifying circuit connects comparison circuit, and the magnification ratio of amplifying circuit is N1/N2.
Arrange two groups of coils at the mutual inductor place of conventional current instrument transformer, the first mutual inductor is according to former ratio setting, and the ratio that sets is N1, and the second mutual inductor, according to a larger ratio setting, be set as N2, and N2 is greater than N1, assuming that COEFFICIENT K=N2/N1; Two groups of mutual inductors connect one group of comparison circuit, and utilize amplifying circuit to carry out amplification process to the second mutual inductor output current, magnification ratio is 1/K, reduces to the 1/K of former ratio by the second mutual inductor output current.
The circuit of last two groups of mutual inductors enters comparison circuit, and comparison circuit limits and exports the upper limit is Imax, and when electric current is less than Imax, two-way output current selects one group of larger output, when electric current is greater than Imax, only exports the electric current of the first mutual inductor.
Described comparison circuit connects output.
The beneficial effect that the utility model is compared with prior art had is:
Current transformer is reasonable in design, effectively can prevent the underload dead band of instrument transformer, and that effectively reduces instrument transformer manufactures and designs difficulty, improves the accuracy of metering, reduces the economic loss of electrical network.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
In figure: 1, the first mutual inductor; 2, the second mutual inductor; 3, amplifying circuit; 4, comparison circuit; 5, output.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
As shown in Figure 1, current transformer, comprise mutual inductor, mutual inductor is made up of the iron core closed and winding, mutual inductor is provided with two groups, and the secondary winding number of turn being respectively the first mutual inductor 1 and the second mutual inductor 2, first mutual inductor 1 is N1 with the ratio of a umber of turn, the secondary winding number of turn of the second mutual inductor 2 and the ratio of a umber of turn are that N2, N2 are greater than N1; First mutual inductor 1 connects comparison circuit 4, and the second mutual inductor 2 connects amplifying circuit 3, and amplifying circuit 3 connects comparison circuit 4, and the magnification ratio of amplifying circuit 3 is N1/N2.
Comparison circuit 4 connects output 5.
In instrument transformer, arrange two groups of mutual inductors, the first mutual inductor 1 is according to former ratio setting, and the ratio that sets is N1, and the second mutual inductor 2, according to a larger ratio setting, be set as N2, and N2 is greater than N1, assuming that COEFFICIENT K=N2/N1.
Two groups of mutual inductors connect one group of comparison circuit, and utilize amplifying circuit 3 to carry out amplification process to the second mutual inductor 2 output current, magnification ratio is 1/K, reduces to the 1/K of former ratio by the second mutual inductor 2 output current.
The circuit of last two groups of mutual inductors enters comparison circuit 4, comparison circuit 4 limits and exports the upper limit is Imax, and when electric current is less than Imax, two-way output current selects one group of larger output, when electric current is greater than Imax, only export the output current of the first mutual inductor 1.
Claims (2)
1. a current transformer, comprise mutual inductor, mutual inductor is made up of the iron core closed and winding, it is characterized in that: mutual inductor is provided with two groups, be respectively the first mutual inductor (1) and the second mutual inductor (2), the secondary winding number of turn of the first mutual inductor (1) is N1 with the ratio of a umber of turn, and the secondary winding number of turn of the second mutual inductor (2) and the ratio of a umber of turn are that N2, N2 are greater than N1; First mutual inductor (1) connects comparison circuit (4), second mutual inductor (2) connects amplifying circuit (3), amplifying circuit (3) connects comparison circuit (4), and the magnification ratio of amplifying circuit (3) is N1/N2.
2. current transformer according to claim 1, is characterized in that: described comparison circuit (4) connects output (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520469705.8U CN204857428U (en) | 2015-06-29 | 2015-06-29 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520469705.8U CN204857428U (en) | 2015-06-29 | 2015-06-29 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204857428U true CN204857428U (en) | 2015-12-09 |
Family
ID=54747955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520469705.8U Active CN204857428U (en) | 2015-06-29 | 2015-06-29 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204857428U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006358A (en) * | 2015-06-29 | 2015-10-28 | 国网山东省电力公司淄博供电公司 | Current transformer |
-
2015
- 2015-06-29 CN CN201520469705.8U patent/CN204857428U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006358A (en) * | 2015-06-29 | 2015-10-28 | 国网山东省电力公司淄博供电公司 | Current transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204832484U (en) | Intelligent substation compensation formula rises and flows device | |
| CN203760297U (en) | Integration structure of transformer and inductor | |
| CN204857428U (en) | Current transformer | |
| CN107066010B (en) | Quadrature field regulator and pressure regulation method | |
| CN203551765U (en) | Zero load on-site electric energy meter testing device | |
| CN201478056U (en) | Novel transformer magnetic core of high frequency and high power | |
| CN105006358A (en) | Current transformer | |
| CN103856176A (en) | LCL filter with coupled inductors | |
| CN206541731U (en) | A kind of current transformer of low current high accuracy | |
| Liu et al. | Design and optimization of high frequency transformer with nanocrystalline core | |
| CN207116212U (en) | A kind of current transformer of polytropic ratio | |
| CN204666709U (en) | Half magnetic core current sensor | |
| CN201229849Y (en) | External integration type Rogowski coil current mutual inductor | |
| CN209544103U (en) | A kind of inductor suitable for high current | |
| CN204155715U (en) | A kind of core structure and there is the reactor of this core structure | |
| CN201364356Y (en) | Cascade current sensor | |
| Panfllov et al. | Optimization of weight and dimensions of longitudinal compensation devices for electric transmission lines 110–220 kV | |
| CN204360910U (en) | A kind of instrument transformer | |
| CN206848848U (en) | Quadrature field regulator | |
| CN203242489U (en) | Measuring current transformer with tap for ultra-high voltage power system | |
| CN110957802A (en) | Self-adaptive online real-time induction energy-taking power supply system | |
| CN104764919A (en) | Electronic type voltage transformer based on lossy double integrating circuit | |
| WO2021248340A1 (en) | Inductor and related apparatus | |
| CN204242780U (en) | Multi winding transformer | |
| CN204102675U (en) | A kind of novel magnetic elements core structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |