CN206672779U - A kind of current transformer with self-calibration function - Google Patents
A kind of current transformer with self-calibration function Download PDFInfo
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- CN206672779U CN206672779U CN201720512387.8U CN201720512387U CN206672779U CN 206672779 U CN206672779 U CN 206672779U CN 201720512387 U CN201720512387 U CN 201720512387U CN 206672779 U CN206672779 U CN 206672779U
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- current transformer
- resistance
- winding
- biquadratic
- error
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- 238000004804 winding Methods 0.000 claims abstract description 51
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000004132 cross linking Methods 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- WCCJDBZJUYKDBF-UHFFFAOYSA-N copper silicon Chemical compound [Si].[Cu] WCCJDBZJUYKDBF-UHFFFAOYSA-N 0.000 claims description 3
- 230000005672 electromagnetic field Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 claims 1
- 238000007689 inspection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- Measurement Of Current Or Voltage (AREA)
Abstract
A kind of current transformer device with self-calibration function is the utility model is related to, the current transformer includes iron core, first side winding coil, secondary side winding coil, switch, resistance and display unit, wherein：The secondary side winding coil is made up of double winding, and the biquadratic winding cross-linking is parallel and around and the number of turn is consistent, and line footpath is consistent；The switch is connected in series after biquadratic winding parallel；The resistance is connected with switch, and the resistance is the noninductive resistance of coiling, and the resistance of resistance is equal with the resistance after biquadratic winding parallel, and display unit is used for the monitoring current transformer current values that secondary side exports in the state of fortune.
Description
Technical field
Transformer field is the utility model is related to, and it is mutual more particularly, to a kind of electric current with self-calibration function
Sensor arrangement.
Background technology
Power system primary equipment is transporting the development trend that detection technique is power system, is provided according to JJG1021, electromagnetism
The inspection time in formula current transformer week is 10 years, but the inspection of the error of current transformer week remains in power failure detection level.Open
Need once to lead to rated current to it during exhibition current transformer error detection, then according to the standard current transformer being attached thereto
It is compared, so as to obtain error information.Make not only to need high-power current lifting device in this way, and also need to normalized current
Transformer and the wire that can bear high current, workload are huge.Current transformer quantity is up to several sometimes in one transformer station
Ten, all inspections are carried out in this way, and longer is required to power off time, is not suitable for the development trend of current power network.
In addition, as the difficulty of rise and the expropriation of land of voltage class increases, the quantity cumulative year after year of GIS types transformer station.Peace
Current mutual inductor coil in GIS pipelines needs two outlet casing tubes using GIS mostly when carrying out error testing,
Standard current transformer is accessed on the outside of it and current lifting device forms a closure cranking test loop.The higher GIS of voltage class
Pipe diameter is bigger with loop length, and progress error testing difficulty is bigger in this way, causes test unit in equipment
Larger burden be present in terms of input and human input.
Therefore, how in equipment in the case of fortune, it is only necessary to less curtage i.e. can be achieved current transformer miss
Poor horizontal self-test, turn into the technical problem of a urgent need to resolve.
Utility model content
In order to solve the problems, such as that background technology is present, it is mutual that the utility model provides a kind of electric current with self-calibration function
Sensor arrangement.
The current transformer with self-calibration function include iron core, first side winding coil, secondary side winding coil,
Switch, resistance and display unit, wherein：
The secondary side winding coil is made up of double winding, and the biquadratic winding cross-linking is parallel and around and the number of turn one
Cause, line footpath is consistent；
The switch is connected in series after biquadratic winding parallel；
The resistance connect with switch, and the resistance is the noninductive resistance of coiling, the resistance of resistance and biquadratic winding
Resistance after parallel connection is equal；
Display unit, for the monitor current transformer current value that secondary side exports in the state of fortune.
Preferably, in order to avoid external electromagnetic field disturbs, the biquadratic winding is after complete, outside biquadratic winding coil
Portion's coiling balance winding or installation shielding box.
Preferably, the secondary output of the current transformer is milliampere level current signal or voltage signal.According to this practicality
The size of novel current transformer primary side current, secondary side electric current output can be 0.01A, 0.02A, 0.05A, 0.1A,
0.2A or 0.5A, even more greatly, the control of total number of turn in 1000 circles between 2000 circles, tail end of switch series connection during parallel running
Sampling small resistor uses noninductive resistance coiling, and resistance size together decides on taking for small resistor after secondary current and secondary winding parallel connection
Sample magnitude of voltage.
Preferably, the current transformer possesses the signal terminal for carrying out live error detection.
Preferably, when the transformer is 0.2 grade or 0.2S level current transformer, biquadratic winding is compared respectively
Calibrated for error compared with method and all meet 0.2 grade of level when Self-calibration Method for Testing Linear calibrates for error, and by adjust core section product make biquadratic around
The deviation that group is compared between the error measured when the error measured when method calibrates for error and self-correcting is at least up to 0.05 grade of water
It is flat.
Preferably, when the current transformer is 0.2 grade of current transformer, iron core uses silicon copper sheet or ultracrystallite,
When the current transformer is 0.2S level current transformers, iron core uses ultracrystallite or permalloy.
Preferably, for the current transformer in rated operation point full load, the close scope of work magnetic is 0.03T to 0.1T.
Preferably, when the current transformer makes the close reduction of work magnetic due to increase sectional area, in biquadratic winding
The upper fast saturable reactor of parallel connection is to ensure that work magnetic is close in normal range (NR).
Technical scheme provided by the utility model is compared with prior art, provided by the utility model to have self calibration work(
Can Current Transformer Secondary side use double winding mode, due to equal turn numbers, biquadratic winding during progress error commissioning test
1 is formed mutually:1 self-correcting form so that carry out that rated primary current need not be led in primary side during error-detecting, but secondary
Side leads to rated secondary current, greatly reduces the overall power requirement amount of measuring loop, and does not need external standard to obtain
Secondary winding error information.In addition, the small resistor of the paralleling switch terminal tandem of the current transformer causes the current transformer
With small voltage signal output function, it is possible to achieve the current transformer carries out live error detection work in the state of fortune.
Brief description of the drawings
By reference to the following drawings, illustrative embodiments of the present utility model can be more fully understood by：
Fig. 1 is the schematic diagram of the current transformer with self-calibration function of the utility model embodiment；
Fig. 2 is that the biquadratic winding of the current transformer with self-calibration function of the utility model embodiment is put down
Row and around structure chart；
Fig. 3 is the current transformer of the utility model embodiment and fast saturable reactor circuit catenation principle figure.
Embodiment
Illustrative embodiments of the present utility model are introduced with reference now to accompanying drawing, however, the utility model can use many
Different forms is implemented, and is not limited to embodiment described herein, there is provided these embodiments are in order at large and complete
Open the utility model entirely, and fully pass on the scope of the utility model to person of ordinary skill in the field.For
Term in the illustrative embodiments being illustrated in the accompanying drawings is not to restriction of the present utility model.In the accompanying drawings, identical
Cells/elements use identical reference.
Unless otherwise indicated, term (including scientific and technical terminology) used herein has to person of ordinary skill in the field
It is common to understand implication.Further it will be understood that the term limited with usually used dictionary, be appreciated that and its
The linguistic context of association area has consistent implication, and is not construed as Utopian or overly formal meaning.
Fig. 1 is the schematic diagram of the current transformer with self-calibration function of the utility model embodiment.Such as Fig. 1
Shown, the current transformer with self-calibration function includes iron core 1, first side winding coil W1, secondary side winding coil
W2, switch 2, resistance R and display unit 3, wherein：
The secondary side winding coil W2By double winding W21And W22Composition.Fig. 2 is the utility model embodiment
The biquadratic winding parallel of current transformer with self-calibration function and around structure chart.As shown in Fig. 2 the biquadratic around
Group W21And W22Cross-linking is parallel and around and the number of turn is consistent, and line footpath is consistent；
The switch 2 is in biquadratic winding W2It is connected in series after parallel connection；
The resistance R 2 connect with switch, and the resistance R is the noninductive resistance of coiling, the resistance and biquadratic of resistance around
Group W2Resistance after parallel connection is equal；
Display unit 3, for monitor current transformer in the state of fortune, the electricity value of secondary side output.
Preferably, in order to avoid external electromagnetic field disturbs, the biquadratic winding W2After complete, in biquadratic winding coil
Outside coiling balance winding or installation shielding box.
Preferably, the secondary output of the current transformer is milliampere level current signal or voltage signal.
Preferably, the current transformer possesses the signal terminal for carrying out live error detection.
Preferably, when the transformer is 0.2 grade or 0.2S level current transformer, biquadratic winding W2Carry out respectively
All meet 0.2 grade of level when comparison method calibrates for error and Self-calibration Method for Testing Linear calibrates for error, and make biquadratic by adjusting core section product
The deviation that winding is compared between the error measured when the error measured when method calibrates for error and self-correcting is at least up to 0.05 grade
It is horizontal.
Preferably, when the current transformer is 0.2 grade of current transformer, iron core uses silicon copper sheet or ultracrystallite,
When the current transformer is 0.2S level current transformers, iron core uses ultracrystallite or permalloy.
Preferably, for the current transformer in rated operation point full load, the close scope of work magnetic is 0.03T to 0.1T.
Fig. 3 is the current transformer of the utility model embodiment and fast saturable reactor circuit catenation principle figure.
As shown in figure 3, when the current transformer makes the close reduction of work magnetic due to increase sectional area, in biquadratic winding W2On simultaneously
Join fast saturable reactor to ensure that work magnetic is close in normal range (NR), wherein, W1For current transformer first side winding coil, W2For
Current Transformer Secondary side winding coil, L are fast saturable reactor, K1And K2For Parallel opertation terminal.
Normally, all terms used in the claims are all solved according to them in the usual implication of technical field
Release, unless clearly being defined in addition wherein.All references " one/described/be somebody's turn to do【Device, component etc.】" all it is opened ground
At least one example being construed in described device, component etc., unless otherwise expressly specified.Any method disclosed herein
Step need not all be run with disclosed accurately order, unless explicitly stated otherwise.
Claims (8)
1. a kind of current transformer with self-calibration function, the current transformer includes iron core, first side winding coil, two
Secondary side winding coil, switch, resistance and display unit, wherein：
The secondary side winding coil is made up of double winding, and the biquadratic winding cross-linking is parallel and around and the number of turn is consistent, line
Footpath is consistent；
The switch is connected in series after biquadratic winding parallel；
The resistance connect with switch, and the resistance is the noninductive resistance of coiling, the resistance of resistance and biquadratic winding parallel
Resistance afterwards is equal；
Display unit, for the monitoring current transformer current values that secondary side exports in the state of fortune.
2. current transformer according to claim 1, it is characterised in that described double in order to avoid external electromagnetic field disturbs
Secondary winding is after complete, coiling balance winding or installation shielding box outside biquadratic winding coil.
3. current transformer according to claim 1, it is characterised in that the secondary output of the current transformer is milliampere
Level current signal or voltage signal.
4. current transformer according to claim 1, it is characterised in that the current transformer possesses carry out live error
The signal terminal of detection.
5. current transformer according to claim 1, it is characterised in that when the transformer is 0.2 grade or 0.2S levels
During current transformer, biquadratic winding is compared method and calibrates for error and all meet 0.2 grade of water when Self-calibration Method for Testing Linear calibrates for error respectively
It is flat, and biquadratic winding is measured when being compared the error measured when method calibrates for error and self-correcting by adjusting core section product
Error between deviation be at least up to 0.05 grade of level.
6. current transformer according to claim 5, when the current transformer is 0.2 grade of current transformer, iron core
Using silicon copper sheet or ultracrystallite, when the current transformer is 0.2S level current transformers, iron core uses ultracrystallite or slope
Not alloy.
7. the current transformer according to claim 4 or 5, it is characterised in that the current transformer is in rated operation point
Full load, the close scope of work magnetic is 0.03T to 0.1T.
8. current transformer according to claim 6, it is characterised in that when the current transformer is due to increasing sectional area
And when making the close reduction of work magnetic, fast saturable reactor in parallel is to ensure that work magnetic is close in normal range (NR) on biquadratic winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720512387.8U CN206672779U (en) | 2017-05-09 | 2017-05-09 | A kind of current transformer with self-calibration function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720512387.8U CN206672779U (en) | 2017-05-09 | 2017-05-09 | A kind of current transformer with self-calibration function |
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|---|---|
| CN206672779U true CN206672779U (en) | 2017-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346634A (en) * | 2019-08-06 | 2019-10-18 | 华中科技大学 | A kind of method and system improving iron-core coil measurement performance |
-
2017
- 2017-05-09 CN CN201720512387.8U patent/CN206672779U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110346634A (en) * | 2019-08-06 | 2019-10-18 | 华中科技大学 | A kind of method and system improving iron-core coil measurement performance |
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