CN108387860A - A kind of electromagnetic current transducer and its error compensating method - Google Patents
A kind of electromagnetic current transducer and its error compensating method Download PDFInfo
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- CN108387860A CN108387860A CN201810285394.8A CN201810285394A CN108387860A CN 108387860 A CN108387860 A CN 108387860A CN 201810285394 A CN201810285394 A CN 201810285394A CN 108387860 A CN108387860 A CN 108387860A
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- current
- secondary winding
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- error compensation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transformers For Measuring Instruments (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
A kind of electromagnetic current transducer of present invention offer and its error compensating method, including iron core and basic secondary winding, it is characterized in that the basic secondary winding is band tap form, it is provided with tapped coil, the error compensation coil that rear end adds first and second winding of coiling on iron core, the full head output of the basic secondary winding of current transformer connects the first winding of error compensation coil, the secondary current that the tap output of basic secondary winding connects error compensation coil flows into end, and the first winding of error compensation coil flows into end and connect with secondary winding Same Name of Ends end.The present invention can compensate for the error when being used other than current transformer rated current 1% 120% so that the measures range of current transformer is wider, and accuracy of measuring higher can be widely applied to electrical energy measurement field.
Description
Technical field
The invention belongs to electric-power metering fields, specifically, provide a kind of electromagnetic current transducer and its error compensation side
Method.
Background technology
Currently, electric power metering system substantially acquires current data using current transformer.Do the metering work of electric energy well
Make, the correct usage amount for measuring electricity, keep metering numerical value more accurate, fair, reduce statistical line losses, directly influence hair, for,
The economic interests of electricity consumption tripartite.
The current transformer for metering accuracy class that power supply department uses at present is mostly 0.2S grades or 0.5S grades.Both
Although the current transformer of level is bigger than the measures range of 0.2 grade and 0.5 grade, when primary side current is in current transformer
Rated current 1% or less when, for electric current than for 100/5A to 200/5A compared with the current transformer of small dimension error deviate
It can the output of very big or even no current.
Common current transformer error compensation way mainly for the rated current required in national standard 1%-120% into
Row compensation, the error beyond the range can not embody.But current transformer often appears in the range in practical applications
The case where outer use, will result in data inaccuracy, or even without metering if effective Error Compensation Technology scheme cannot be provided
The case where.
Invention content
For the above deficiency in the prior art, the problem to be solved in the present invention is：A kind of electromagnetic type Current Mutual Inductance is provided
Device and its error compensating method can compensate for the error when being used other than current transformer rated current 1%-120% so that
The measures range of current transformer is wider, accuracy of measuring higher.
The technical scheme is that：
A kind of electromagnetic current transducer, including iron core, basic secondary winding 2, it is characterised in that：It is described it is substantially secondary around
Group 2 is the form with tap, is provided with tapped coil N1,2 rear end of basic secondary winding adds an error compensation coil 3；Institute
State the input first winding N3 that error compensation coil 3 includes the coiling on iron core, output secondary winding N4；It is described it is substantially secondary around
The input first winding N3 of the full circle output connection error compensation coil 3 of group 2, wherein the electric current stream of the basic secondary winding 2
Outlet S1 flows into end with the primary current of 3 first winding N3 of error compensation coil and connect, and the primary current of first winding N3 flows into
The secondary current outflow end of end and secondary winding N4 are connected with each other for Same Name of Ends；2 tapped coil N1's of the basic secondary winding
Tap terminals M flows into end with the secondary current of 3 secondary winding N4 of error compensation coil and connect；The error compensation coil 3 two times around
The output of group N4 connects external electric energy meter.
A kind of error compensating method of electromagnetic current transducer, it is characterised in that：Electromagnetic current transducer basic two
The full circle output of secondary winding 2 provides the primary current I3 of 3 first winding N3 of error compensation coil, and primary current I3 is from Current Mutual Inductance
The electric current outflow end outflow of the basic secondary winding of device 2 after the first winding N3 for flowing through error compensation coil 3, returns to Current Mutual Inductance
The electric current of the basic secondary winding of device 2 flows into end；
The tapped coil N1 of the basic secondary winding of electromagnetic current transducer 2 provides tap and compensates electric current I2, tap compensation
Electric current I2 from the electric current outflow end of basic secondary winding 2 flow out, after flowing through external electric energy meter, from current transformer it is substantially secondary around
Tapped coil N1 is flowed at tap M in group 2；
The secondary current output of 3 secondary winding N4 of error compensation coil generates error compensation electric current I5, error compensation electric current
Current transformer output current I4 is formed after I5 and the tap compensation electric current I2 confluences of tapped coil N1 outputs, flows into external electric energy
The current transformer output current I4 of table is equal to the sum of error compensation electric current I5 and tap compensation electric current I2, error compensation electric current I5
With tap compensation electric current I2 the error compensation to current transformer is completed with variation interaction, the superposition of load current.
Wherein, at integral multiple the number of turns between the full circle coil and tapped coil of the basic secondary winding of the current transformer 2
Relationship, at integral multiple the number of turns relationship between the output secondary winding N4 and input first winding N3 of the error compensation coil 3.
Further, the number of turns between the full circle coil of the basic secondary winding of the current transformer (2), tapped coil (N1)
The number of turns multiple between multiple and the error compensation coil (3) output secondary winding (N4), input first winding (N3) is identical.
Compared with prior art, advantageous effect possessed by the present invention is：There is provided a kind of electromagnetic current transducer and its
Error compensating method so that range of the error of S grades of electromagnetic current transducers other than the 1%-120% of national Specification
It is also accurate, can effectively improve the measuring accuracy and width of current transformer.
Description of the drawings
Fig. 1 is the electric wiring connection diagram of electromagnetic current transducer of the present invention.
Fig. 2 is the schematic block diagram of electromagnetic current transducer error compensating method of the present invention.
In above-mentioned figure：1 current sensor；2 basic secondary windings；3 error compensation coils；4 electric energy meters；N1 tapped coils；
N2 winding coils；N3 error compensation coil first windings；N4 error compensation coil secondary windings.
Specific implementation mode
The present invention is described further below in conjunction with the accompanying drawings.
It is the electric wiring connection diagram of the electromagnetic current transducer of the present invention as shown in Figure 1.The electromagnetism of the present invention
Formula current transformer 1, including iron core (not shown), basic secondary winding 2 and error compensation coil 3, wherein substantially secondary
Winding 2 is the form with tap, is provided with tap M and tapped coil N1.The primary side load current of current transformer is from the ends P1
Flow into, the ends P2 outflow, the secondary current of current transformer is flowed out from the ends S1, divide two-way flow through error compensation coil 3 it is primary around
It after organizing N3 and external electric energy meter, then is flowed into respectively from the ends S2 of current transformer and the ends tap M, wherein P1 and S1 are Same Name of Ends.
It is connected with error compensation coil 3 in the rear end of basic secondary winding 2, error compensation coil 3 includes the input of the coiling on iron core
First winding N3, output secondary winding N4；The input of the full circle output connection error compensation coil 3 of basic secondary winding 2 is primary
Winding N3, wherein common end, that is, electric current outflow end S1 of basic secondary winding 2 and tapped coil N1 is primary with error compensation coil 3
The primary current of winding N3 flows into end connection, and the primary current of first winding N3 flows into the secondary current stream at end and secondary winding N4
Outlet is connected with each other for Same Name of Ends；The tap terminals and 3 secondary winding N4 of error compensation coil of 2 tapped coil N1 of basic secondary winding
Secondary current flow into end connection；The output of 3 secondary winding N4 of error compensation coil connects external electric energy meter.
Preferably, full circle coil (the i.e. N1+N2, including winding coil N2 and pumping of 1 basic secondary winding 2 of current transformer
Head coil N1) between tapped coil N1 at integral multiple the number of turns relationship, output secondary winding N4 and the input of error compensation coil 3
At integral multiple the number of turns relationship between first winding N3；Further, the basic 2 full circle coil (N1+ of secondary winding of current transformer
N2), the number of turns multiple between tapped coil N1 and the error compensation coil 3 output secondary winding N4, input first winding N3
Between the number of turns multiple it is identical, i.e., (N1+N2)：N1=N4:N3.
It is the schematic block diagram of electromagnetic current transducer error compensating method of the present invention, current transformer base as shown in Figure 2
The full circle output of this secondary winding 2 provides the primary current I3 of 3 first winding N3 of error compensation coil, and primary current I3 is from electric current
The ends the S1 outflow of the basic secondary winding of mutual inductor 2, flows through current node A, according to Kirchhoff's current law (KCL), in node A：I3=
After I1-I2, I3 flow through the first winding N3 of error compensation coil 3 after current node A outflows, current transformer basic two is returned to
The ends S2 of secondary winding 2.
The tapped coil N1 of the basic secondary winding of current transformer 2 provides tap and compensates electric current I2, and tap compensates electric current I2
It is flowed out from the ends S1 of basic secondary winding 2, current node A is flowed through, in node A：I2=I1-I3, I2 are after current node A outflows
Current node B is flowed through, in node B：I2+I5=I4, I2 pass through external metering electric energy meter 4 and electricity after current node B outflows
Node C is flowed, in node C：I2=I4-I5 finally flows into tapped coil from the tap M in the basic secondary winding of current transformer 2
N1, in node M：I2+I3=I1.
The secondary current output of 3 secondary winding N4 of error compensation coil generates error compensation electric current I5, error compensation electric current
I5 and the tap compensation electric current I2 of tapped coil N1 outputs form current transformer output current I4 after current node B confluences,
According to Kirchhoff's current law (KCL), current transformer output current I4 be flow into electric energy meter 4 for metering electric current I4 by error
Electric current I5 and tap compensation electric current I2 compositions are compensated, i.e.,：I4=I2+I5, with load current variation I2 and I5 interaction,
It mutually compensates for, the error compensation to current transformer is completed in superposition so that the electric current I4 into electric energy meter 4 is operated in reasonably always
Error range, to improve the precision and gage width of current transformer 1.
The course of work：Actual in electric line, when load is very small, due to error compensation coil 3 it is primary around
There are magnetic resistance, the most of electric currents of output of current transformer to enter electric energy meter, error compensation electricity through tap compensation electric current I2 by group N3
Stream I5 is intended only as the compensation to tap compensation electric current I2；When load increases to a certain extent, when the line of tap compensation electric current I2
When resistance caused by diameter is more than the magnetic resistance that 3 first winding N3 of error compensation coil is generated, most of output of current transformer
The first winding N3 of error compensation coil can be passed through and induce N4/N3 times of error compensation electric current I5 in secondary winding N4 and flowed into
Electric energy meter, the electric current I2 of tap compensation at this time are intended only as the compensation to error compensation electric current I5.Pass through current transformer basic two
The setting in 3 core sataration area of 2 iron core of secondary winding and error compensation coil, with the variation of load current, tap compensates electric current I2
It interacts, mutually compensated for so that mistake of the current transformer within the 1%-120% of rated current with error compensation electric current I5
Difference can meet the requirement of national standard, and in use, still having very high standard other than the 1%-120% of rated current
Exactness, to effectively increase measures range and the accuracy of current transformer.
Claims (4)
1. a kind of electromagnetic current transducer, including iron core, basic secondary winding (2), it is characterised in that：It is described it is substantially secondary around
Group (2) is the form with tap, is provided with tapped coil (N1), basic secondary winding (2) rear end adds an error compensation line
It encloses (3)；The error compensation coil (3) includes the input first winding (N3) of the coiling on iron core, output secondary winding (N4)；
The input first winding (N3) of the full circle output connection error compensation coil (3) of the basic secondary winding (2), wherein the base
The electric current outflow end (S1) of this secondary winding (2) flows into end with the primary current of error compensation coil (3) first winding (N3) and connects
It connects, it is that Same Name of Ends mutually interconnects that the primary current of first winding (N3), which flows into end with the secondary current outflow end of secondary winding (N4),
It connects；The tap terminals (M) of basic secondary winding (2) tapped coil (N1) and error compensation coil (3) secondary winding (N4)
Secondary current flows into end connection；The output of error compensation coil (3) secondary winding (N4) connects external electric energy meter.
2. the error compensating method of electromagnetic current transducer according to claim 1, it is characterised in that：
The full circle output of the basic secondary winding of electromagnetic current transducer (2) provides error compensation coil (3) first winding (N3)
Primary current (I3), primary current (I3) from the electric current outflow end of the basic secondary winding of current transformer (2) flow out, flow through mistake
After the first winding (N3) of poor bucking coil (3), the electric current for returning to the basic secondary winding of current transformer (2) flows into end；
The tapped coil (N1) of the basic secondary winding of electromagnetic current transducer (2) provides tap compensation electric current (I2), and tap is mended
Electric current (I2) is repaid to flow out from the electric current outflow end of basic secondary winding (2), it is basic from current transformer after flowing through external kilowatt-hour meter
Tap terminals (M) in secondary winding (2) flow into tapped coil (N1)；
The secondary current output of error compensation coil (3) secondary winding (N4) generates error compensation electric current (I5), error compensation electricity
Current transformer output current (I4), stream are formed after flowing tap compensation electric current (I2) confluence of (I5) and tapped coil (N1) output
Enter external electric energy meter current transformer output current (I4) be equal to error compensation electric current (I5) and tap compensation electric current (I2) it
It is completed to electricity with variation interaction, the superposition of load current with, error compensation electric current (I5) and tap compensation electric current (I2)
The error compensation of current transformer.
3. electromagnetic current transducer according to claim 1, it is characterised in that：The current transformer it is substantially secondary around
At integral multiple the number of turns relationship between the full circle coil and tapped coil of group (2), the output of the error compensation coil (3) it is secondary around
At integral multiple the number of turns relationship between group (N4) and input first winding (N3).
4. electromagnetic current transducer according to claim 1, it is characterised in that：The current transformer it is substantially secondary around
The number of turns multiple between the full circle coil of group (2), tapped coil (N1) exports secondary winding with the error compensation coil (3)
(N4), the number of turns multiple between input first winding (N3) is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810285394.8A CN108387860A (en) | 2018-04-03 | 2018-04-03 | A kind of electromagnetic current transducer and its error compensating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810285394.8A CN108387860A (en) | 2018-04-03 | 2018-04-03 | A kind of electromagnetic current transducer and its error compensating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108387860A true CN108387860A (en) | 2018-08-10 |
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ID=63072348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810285394.8A Withdrawn CN108387860A (en) | 2018-04-03 | 2018-04-03 | A kind of electromagnetic current transducer and its error compensating method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108387860A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031178A (en) * | 2018-09-14 | 2018-12-18 | 国网江苏省电力有限公司连云港市赣榆区供电分公司 | A method of it is inconsistent to solve current transformer ratio |
| CN110672916A (en) * | 2019-10-22 | 2020-01-10 | 绵阳市维博电子有限责任公司 | Open-type digital direct current measuring device |
| CN110672915A (en) * | 2019-10-22 | 2020-01-10 | 绵阳市维博电子有限责任公司 | Direct current measuring method based on open type structure |
-
2018
- 2018-04-03 CN CN201810285394.8A patent/CN108387860A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031178A (en) * | 2018-09-14 | 2018-12-18 | 国网江苏省电力有限公司连云港市赣榆区供电分公司 | A method of it is inconsistent to solve current transformer ratio |
| CN110672916A (en) * | 2019-10-22 | 2020-01-10 | 绵阳市维博电子有限责任公司 | Open-type digital direct current measuring device |
| CN110672915A (en) * | 2019-10-22 | 2020-01-10 | 绵阳市维博电子有限责任公司 | Direct current measuring method based on open type structure |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180810 |
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| WW01 | Invention patent application withdrawn after publication |