CN102709042A - Current transformer - Google Patents
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- CN102709042A CN102709042A CN201210209079XA CN201210209079A CN102709042A CN 102709042 A CN102709042 A CN 102709042A CN 201210209079X A CN201210209079X A CN 201210209079XA CN 201210209079 A CN201210209079 A CN 201210209079A CN 102709042 A CN102709042 A CN 102709042A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase ac
- H01F38/28—Current transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
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Abstract
The invention discloses a current transformer. One technical scheme is that the current transformer comprises a main magnetic core, auxiliary magnetic cores, a first coil, a second coil, maxillary coils, a load resistor connected with two ends of the second coil, and a detection resistor connected with two ends of the auxiliary coils, wherein the ratio of the resistance value of the detection resistor to the resistance value of the load resistor is equal to that of the turns of the auxiliary coils to the turns of the second coil; the first coil and the second coil are wound on the main magnetic core and the auxiliary magnetic cores; the auxiliary coils are wound on the auxiliary magnetic cores; the non-like ends of the auxiliary coils are connected with the like end of the second coil; the two ends of the first coil serve as the current input end; and the like ends of the auxiliary coils and the non-like end of the second coil serve as the signal output end. The current transformer has the characteristic of high measurement precision.
Description
Technical field
The invention belongs to the electrotechnical measurement Instrument technology field, be specifically related to a kind of current transformer.
Background technology
Current transformer is a kind of broad-spectrum electrotechnical measurement instrument, its be widely used in that industrial field device, electric power system are once protected and control loop in, the basic performance requirement of current transformer is to have high certainty of measurement.
Referring to Fig. 1, conventional current transformer is made up of magnetic core 1, primary winding 3 and secondary coil 4, when flowing through electric current in the primary winding; Because electromagnetic induction will induce electromotive force in secondary coil, on secondary coil 4, be connected with load resistance 6; Then in secondary coil 4, produce secondary current; When secondary current flows through load resistance 6, produce signal voltage at the two ends of load resistance 6, this signal voltage is proportional to the electric current that flows through primary winding 3.The coil terminals that among Fig. 1, indicates " * " is the end of the same name of primary winding 3 or secondary coil 4.
Because the existence of magnetic core magnetic resistance; Current transformer is in the process that changes electric current; Must consume the sub-fraction electric current and be used for excitation; Make the magnetic core magnetization, thereby produce induced potential and secondary current at secondary coil, the measure error of current transformer is owing to the exciting current that magnetic core consumed causes.When not carrying out error compensation, the ratio difference of current transformer and phase angle difference all are to increase along with reducing of primary current, and compensation method commonly used has fractional turns compensation, magnetic shunt compensation etc., but the certainty of measurement after the compensation is still lower.
Chinese patent document CN201549350U discloses a kind of current transformer laminated core magnetic shunt compensation device; It comprises stacked upper core, stacked lower core, secondary winding, magnetic shunt compensation winding; Secondary winding is on stacked upper core and stacked lower core; The magnetic shunt compensation winding is on stacked upper core; Secondary winding and magnetic shunt compensation winding are in series, and utilize the non-linear certainty of measurement to current transformer of stacked upper core magnetic property to compensate, and compensation rate depends on the number of turn of the magnetic property and the magnetic shunt compensation winding of stacked upper core; Use the certainty of measurement of magnetic shunt compensation after-current instrument transformer all to obtain bigger improvement, but the certainty of measurement after the compensation is still lower.
In addition, Chinese patent document CN87200450U discloses twin-stage low magnetic flux capacity compensating current transformer, CN1022269C discloses double-auxiliary coupling compensation current transformer, and all there is the low defective of the certainty of measurement after the compensation in technique scheme.
Summary of the invention
The invention provides the high current transformer of a kind of certainty of measurement.
The present invention adopts following multiple technologies scheme:
Technical scheme one: a kind of current transformer; Comprise main magnetic core, auxiliary magnetic core, primary winding, secondary coil, ancillary coil, be connected the secondary coil two ends load resistance, be connected the detection resistance at ancillary coil two ends; The ratio of resistance that detects resistance and the load resistance of resistance equals the ratio of the number of turn of the number of turn and the secondary coil of ancillary coil; Primary winding and secondary coil are wound on main magnetic core and the auxiliary magnetic core; Ancillary coil is wound on the auxiliary magnetic core; The end of the same name of the non-same polarity of ancillary coil and secondary coil is connected, and the two ends of primary winding are current input terminal, and the end of the same name of ancillary coil and the non-same polarity of secondary coil are signal output part; Perhaps, the end of the same name of ancillary coil and the two ends of secondary coil are signal output part, when needing current transformer to be output as three ends output signal, use.
Constitute the 1st grade of current transformer by main magnetic core, primary winding, secondary coil and load resistance.
Constitute the 2nd grade of current transformer by auxiliary magnetic core, primary winding, secondary coil, ancillary coil and detection resistance.
For the 1st grade of current transformer, following equation is arranged:
Ip*Np?-?I1*Ns?-?Iz1*Ns?=0
Iz1?=?E1?/Z1
E1?=?I1*R01?+?I1*R
Wherein: Np: the number of turn of primary winding;
Ns: the number of turn of secondary coil;
Ip: the electric current in the primary winding;
I1: the electric current in the secondary coil;
Iz1: the exciting current of main magnetic core;
E1: the induced potential on the secondary coil;
Z1: the excitation impedance of main magnetic core;
R01: the impedance of secondary coil;
R: load resistance;
Find the solution above equation, then can obtain:
I1=(Np/Ns)*Ip*?(1-e1)
U1=I1*R=(Np/Ns)*Ip*R*?(1-e1)
e1?=[(R01?+?R)/Z1]/[1+(R01?+?R)/Z1]
U1: the voltage on the load resistance
The measure error of the 1st grade of current transformer is: e1, and be negative value.
For the 2nd grade of current transformer, following equation is arranged:
Ip*Np?-?I1*Ns?-?I2*Nf?-?Iz2*Nf?=0
Iz2?=?E2?/Z2
E2?=?I2*R02?+?I2*Rf
Wherein: Nf: the number of turn of ancillary coil;
I2: the electric current in the ancillary coil;
Iz2: the exciting current of auxiliary magnetic core;
E2: the induced potential on the ancillary coil;
Z2: the excitation impedance of auxiliary magnetic core;
R02: the impedance of ancillary coil;
Rf: detect resistance;
With the above equation of I1=(Np/Ns) * Ip* (1-e1) substitution and find the solution, then can obtain:
I2=(Np/Nf)*Ip*e1*(1-e2)
e2?=[(R02?+?Rf)/Z2]/[1?+?(R02?+?Rf)/Z2]
The measure error of the 2nd grade of current transformer is: e2, and be negative value.
Since detect the ratio of the number of turn that the ratio of resistance of resistance and the load resistance of resistance equals the number of turn and the secondary coil of ancillary coil, so have:
Rf/R?=?Nf/Ns
Voltage between the end of the same name of ancillary coil and the non-same polarity of secondary coil is:
U?=?I1*R?+?I2*Rf
U?=(Np/Ns)*Ip*R*(1-e1*e2)
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2
U: the voltage between the end of the same name of ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer is the product of measure error e2 of measure error e1 and the 2nd grade of current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
In addition, for the 2nd grade of current transformer, following equation is arranged:
Ip*Np?-?I1*Ns?-?I2*Nf?-?Iz2*Nf?=0
With I1=(Np/Ns) * Ip* (1-e1) substitution aforesaid equation
Then have: (Ip*e1) * Np – I2*Nf-Iz2*Nf=0
I.e. equivalence uses the 2nd grade of current transformer that electric current (Ip*e1) is detected; Because electric current (Ip*e1) is much littler than the electric current I p in the input primary winding of the 1st grade of current transformer; Therefore, the magnetic core of the 2nd grade of current transformer can use the long-pending magnetic core of small cross sections, and promptly the sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core; Thereby reduce the material use amount of current transformer, reduce the manufacturing cost of current transformer.
When the certainty of measurement of using 2 grades above current transformer still can not satisfy the requiring of current transformer certainty of measurement, can use more multistage current transformer with satisfied requirement to the current transformer certainty of measurement.
Technical scheme two: a kind of current transformer; Comprise main magnetic core, a n auxiliary magnetic core, primary winding, secondary coil, a n ancillary coil, be connected the secondary coil two ends load resistance, be connected the 1st of the 1st ancillary coil two ends and detect resistance, be connected the 2nd of the 2nd ancillary coil two ends and detect resistance, detect resistance until the n that is connected n ancillary coil two ends; N is the integer more than or equal to 2; The 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 2nd ancillary coil; By that analogy, the ratio of resistance that detects resistance and the load resistance of resistance until n equals the ratio of the number of turn of the number of turn and the secondary coil of n ancillary coil;
Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core; By that analogy, be wound on the n auxiliary magnetic core until the n ancillary coil;
The end of the same name of secondary coil is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; By that analogy, the end of the same name until the n-1 ancillary coil is connected with the non-same polarity of n ancillary coil;
The two ends of primary winding are current input terminal, and the end of the same name of n ancillary coil and the non-same polarity of secondary coil are signal output part; Perhaps, the end of the same name of n ancillary coil and the two ends of secondary coil are signal output part, when needing current transformer to be output as three ends output signal, use.
Constitute the 1st grade of current transformer by main magnetic core, primary winding, secondary coil and load resistance.
Detect resistance by the 1st auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil and the 1st and constitute the 2nd grade of current transformer.
Detect resistance by the 2nd auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil to the 2 ancillary coils and the 2nd and constitute the 3rd level current transformer.
By that analogy, until:
Detect resistance by n auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil to the n ancillary coil and n and constitute n+1 level current transformer.
For the 1st grade of current transformer, following equation is arranged:
Ip*Np?-?I1*Ns?-?Iz1*Ns?=0
Iz1?=?E1?/Z1
E1?=?I1*R01?+?I1*R
Wherein: Np: the number of turn of primary winding;
Ns: the number of turn of secondary coil;
Ip: the electric current in the primary winding;
I1: the electric current in the secondary coil;
Iz1: the exciting current of main magnetic core;
E1: the induced potential on the secondary coil;
Z1: the excitation impedance of main magnetic core;
R01: the impedance of secondary coil;
R: load resistance;
Find the solution above equation, then can obtain:
I1=(Np/Ns)*Ip*?(1-e1)
U1=I1*R=(Np/Ns)*Ip*R*?(1-e1)
e1?=[(R01?+?R)/Z1]/[1+(R01?+?R)/Z1]
U1: the voltage on the load resistance
The measure error of the 1st grade of current transformer is: e1, and be negative value.
For the 2nd grade of current transformer, following equation is arranged:
Ip*Np?-?I1*Ns?-?I2*Nf1?-?Iz2*Nf1?=0
Iz2?=?E2?/Z2
E2?=?I2*R02?+?I2*Rf1
Wherein: Nf1: the number of turn of the 1st ancillary coil;
I2: the electric current in the 1st ancillary coil;
Iz2: the exciting current of the 1st auxiliary magnetic core;
E2: the induced potential on the 1st ancillary coil;
Z2: the excitation impedance of the 1st auxiliary magnetic core;
R02: the impedance of the 1st ancillary coil;
Rf1: the 1st detects resistance;
With the above equation of I1=(Np/Ns) * Ip* (1-e1) substitution and find the solution, then can obtain:
I2=(Np/Nf1)*Ip*e1*(1-e2)
e2?=[(R02?+?Rf1)/Z2]/[1?+?(R02?+?Rf1)/Z2]
The measure error of the 2nd grade of current transformer is: e2, and be negative value.
By that analogy, until:
For n+1 level current transformer, following equation is arranged:
Ip*Np?-I1*Ns?-I2*Nf1?–……?–I(n+1)*Nfn?–Iz(n+1)*Nfn?=0
Iz(n+1)?=?E(n+1)?/Z(n+1)
E(n+1)?=?I(n+1)*R0(n+1)?+?I(n+1)*Rfn
Rfn/R?=?Nfn/Ns
Wherein: Nfn: the number of turn of n ancillary coil;
I (n+1): the electric current in the n ancillary coil;
Iz (n+1): the exciting current of n auxiliary magnetic core;
E (n+1): the induced potential on the n ancillary coil;
Z (n+1): the excitation impedance of n auxiliary magnetic core;
R0 (n+1): the impedance of n ancillary coil;
Rfn: n detects resistance;
To above equation and find the solution, then can obtain:
I(n+1)=(Np/Nfn)*Ip*e1*e2*…*[1-e(n+1)]
e(n+1)?={[R0(n+1)?+?Rfn]/Z(n+1)}/{1?+?[R0(n+1)?+?Rfn)]/Z(n+1)}
The measure error of (n+1) level current transformer is: e (n+1), and be negative value.
Since the 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 2nd ancillary coil; By that analogy; The ratio of resistance that detects resistance and the load resistance of resistance until n equals the ratio of the number of turn of the number of turn and the secondary coil of n ancillary coil, so have:
Rf1/R?=?Nf1/Ns
Rf2/R?=?Nf2/Ns
By that analogy, until:
Rfn/R?=?Nfn/Ns
Voltage between the end of the same name of n ancillary coil and the non-same polarity of secondary coil is:
U?=?I1*R?+?I2*Rf1?+……?+?I(n+1)*Rfn
U?=(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2*……*e(n+1)
U: the voltage between the end of the same name of n ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 until with the product of the measure error e (n+1) of n+1 level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
Preferably; N equals at 2 o'clock; Current transformer comprises main magnetic core, the 1st auxiliary magnetic core, the 2nd auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil, the 2nd ancillary coil, is connected the load resistance at secondary coil two ends, is connected the 2nd detection resistance that the 1st of the 1st ancillary coil two ends are detected resistance, are connected the 2nd ancillary coil two ends; The 1st detect resistance the ratio of resistance and the resistance of load resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil, the ratio of the resistance of the 2nd detection resistance and the resistance of load resistance equals the ratio of the number of turn of the number of turn and the secondary coil of the 2nd ancillary coil; Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core; The end of the same name of secondary coil is connected with the non-same polarity of the 1st ancillary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; The two ends of primary winding are current input terminal, and the end of the same name of the 2nd ancillary coil and the non-same polarity of secondary coil are signal output part; Perhaps, the end of the same name of the 2nd ancillary coil and the two ends of secondary coil are signal output part, when needing current transformer to be output as three ends output signal, use.
Voltage between the end of the same name of the 2nd ancillary coil and the non-same polarity of secondary coil is:
U?=(Np/Ns)*Ip*R*(1-e1*e2*e3)
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2*e3
U: the voltage between the end of the same name of the 2nd ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 and with the product of the measure error e3 of 3rd level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
Technical scheme three: a kind of current transformer comprises: main magnetic core, auxiliary magnetic core, primary winding, secondary coil, ancillary coil, primary winding and secondary coil are wound on main magnetic core and the auxiliary magnetic core, and ancillary coil is wound on the auxiliary magnetic core;
The two ends of primary winding are current input terminal, and the two ends of ancillary coil and the two ends of secondary coil are signal output part; Perhaps, the end of the same name of the non-same polarity of ancillary coil and secondary coil is connected; The end of the same name of ancillary coil and the two ends of secondary coil are signal output part.
During use; If the non-same polarity of the ancillary coil of current transformer and the end of the same name of secondary coil then externally do not connect in the circuit when being connected; The two ends of the secondary coil of current transformer are connected with load resistance in the external circuit; The two ends of the ancillary coil of current transformer are connected with detection resistance in the external circuit; When the ratio of the resistance of the resistance of the detection resistance of selecting and load resistance equaled the ratio of the number of turn of the number of turn and secondary coil of ancillary coil, the voltage between the end of the same name of ancillary coil and the non-same polarity of secondary coil was:
U?=(Np/Ns)*Ip*R*(1-?e1*e2)
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2
Wherein:
U: the voltage between the end of the same name of ancillary coil and the non-same polarity of secondary coil.
Np: the number of turn of primary winding;
Ns: the number of turn of secondary coil;
Ip: the electric current in the primary winding;
R: load resistance;
E1: the measure error of the 1st grade of current transformer
E2: the measure error of the 2nd grade of current transformer
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer is the product of measure error e2 of measure error e1 and the 2nd grade of current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
The sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core, thereby reduces the material use amount of current transformer, reduces the manufacturing cost of current transformer.
Technical scheme four: a kind of current transformer; Comprise main magnetic core, a n auxiliary magnetic core, primary winding, secondary coil, a n ancillary coil, n is the integer more than or equal to 2, and primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core, by that analogy, is wound on the n auxiliary magnetic core until the n ancillary coil; The end of the same name of secondary coil is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; By that analogy, the end of the same name until the n-1 ancillary coil is connected with the non-same polarity of n ancillary coil; The two ends of primary winding are current input terminal, and the end of the same name of n ancillary coil and the two ends of secondary coil are signal output part.
During use; The two ends of the secondary coil of current transformer are connected with load resistance in the external circuit; In the end of the same name of the secondary coil of current transformer and the end of the same name of the 1st ancillary coil and the external circuit the 1st detects resistance and is connected; In the end of the same name of the 1st ancillary coil of current transformer and the end of the same name of the 2nd ancillary coil and the external circuit the 2nd detects resistance and is connected; By that analogy, detecting resistance until the end of the same name of the end of the same name of the n-1 ancillary coil of current transformer and n ancillary coil with n in the external circuit is connected;
When the 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 2nd ancillary coil; By that analogy; When the ratio of resistance that detects resistance and the load resistance of resistance until n equaled the ratio of the number of turn of the number of turn and secondary coil of n ancillary coil, then the voltage between the non-same polarity of the end of the same name of n ancillary coil and secondary coil was:
U?=(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2*……*e(n+1)
U: the voltage between the end of the same name of n ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 until with the product of the measure error e (n+1) of n+1 level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
Preferably; N equals at 2 o'clock; Current transformer comprises main magnetic core, the 1st auxiliary magnetic core, the 2nd auxiliary magnetic core, primary winding, secondary coil, the 1st ancillary coil, the 2nd ancillary coil; Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core; The non-same polarity of the 1st ancillary coil is connected with the end of the same name of secondary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; The two ends of primary winding are current input terminal, and the two ends of the end of the same name of the 2nd ancillary coil, the end of the same name of the 1st ancillary coil and secondary coil are signal output part.
During use; The two ends of the secondary coil of current transformer are connected with load resistance in the external circuit; In the end of the same name of the secondary coil of current transformer and the end of the same name of the 1st ancillary coil and the external circuit the 1st detects resistance and is connected, and the end of the same name of the 1st ancillary coil of current transformer and the end of the same name of the 2nd ancillary coil are connected with the 2nd detection resistance in the external circuit;
When select the 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance when equaling the ratio of the number of turn of the number of turn and secondary coil of the 2nd ancillary coil, then the voltage between the non-same polarity of the end of the same name of the 2nd ancillary coil and secondary coil is:
U?=(Np/Ns)*Ip*R*(1-e1*e2*e3)
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2*e3
U: the voltage between the end of the same name of n ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 until with the product of the measure error e3 of 3rd level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
Use magnetic core lap wound structure in the above technical scheme, in addition, can also adopt the magnetic core separate type, i.e. coiling on magnetic core respectively, the magnetic core with the good coil of coiling puts together again, and coil is connected on request.
Technical scheme five: a kind of current transformer, comprise the end of the same name of main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil, the non-same polarity that is connected secondary coil the 1st winding and secondary coil the 2nd winding load resistance, be connected the detection resistance at ancillary coil two ends; The ratio of resistance that detects resistance and the load resistance of resistance equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of ancillary coil, and the ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and the 2nd group of primary winding and secondary coil the 2nd winding and ancillary coil are wound on the auxiliary magnetic core;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of ancillary coil and secondary coil the 1st winding is a signal output part; Perhaps, the end of the same name of the end of the same name of ancillary coil, secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part, when needing current transformer to be output as three ends output signal, use.
Constitute the 1st grade of current transformer by main magnetic core, primary winding the 1st winding, secondary coil the 1st winding, secondary coil the 2nd winding and load resistance.
Constitute the 2nd grade of current transformer by auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, ancillary coil and detection resistance.
For the 1st grade of current transformer and the 2nd grade of current transformer, following equation is arranged:
Ip*Np1?-?I1*Ns1?-?Iz1*Ns1?=0
Ip*Np2?-?I1*Ns2?-?I2*Nf?-?Iz2*Nf?=0
Np1/Ns1?=?Np2/Ns2
Iz1?=?E1/Z1
E1+E2?=?I1*R01?+?I1*R
Iz2?=?E2?/Z2
E2?=?I2*R02?+?I2*Rf
Rf/?R?=?Nf/Ns2
Wherein:
Np1: the number of turn of primary winding the 1st winding;
Ns1: the number of turn of secondary coil the 1st winding;
Np2: the number of turn of primary winding the 2nd winding;
Ns2: the number of turn of secondary coil the 2nd winding;
Nf: the number of turn of ancillary coil;
Ip: the electric current in primary winding the 1st winding and primary winding the 2nd winding;
I1: the electric current in secondary coil the 1st winding and secondary coil the 2nd winding;
I2: the electric current in the ancillary coil;
Iz1: the exciting current of main magnetic core;
Iz2: the exciting current of auxiliary magnetic core;
E1: the induced potential on secondary coil the 1st winding;
E2: the induced potential on secondary coil the 2nd winding;
Z1: the excitation impedance of main magnetic core;
Z2: the excitation impedance of auxiliary magnetic core;
R01: total coil impedance of secondary coil the 1st winding and secondary coil the 2nd winding;
R02: the impedance of ancillary coil;
R: load resistance;
Rf: detect resistance;
Find the solution above equation, then can obtain:
I1=(Np1/Ns1)*Ip*?(1-e1)
I2=(Np2/Nf)*Ip*e1*?(1-e2)
e1?=[(R01?+?R)/Z1]/[1+(R01?+?R)/Z1?+k]
e2?=[(R02?+?Rf)/Z2]/[1?+?(R02?+?Rf)/Z2]
k=(Ns2/Nf)*(Z2/Z1)*e2
Voltage between the non-same polarity of the end of the same name of ancillary coil and secondary coil the 1st winding is:
U?=?I1*R?+?I2*Rf
U?=(Np1/Ns1)*Ip*R*(1-e1*e2)
U?=(Np1/Ns1)*Ip*R*(1-e)
e?=?e1*e2
U: the voltage between the end of the same name of ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer is the product of measure error e2 of measure error e1 and the 2nd grade of current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
In addition, for the 2nd grade of current transformer, following equation is arranged:
Ip*Np2?-?I1*Ns2?-?I2*Nf?-?Iz2*Nf?=0
Because: I1=(Np1/Ns1) * Ip* (1-e1)=(Np2/Ns2) * Ip* (1-e1)
Therefore have: (Ip*e1) * Np2 – I2*Nf-Iz2*Nf=0
Promptly the 2nd grade of current transformer is used for the detection to electric current (Ip*e1); Because electric current (Ip*e1) is much littler than the electric current I p in the input primary winding of the 1st grade of current transformer; Therefore, the magnetic core of the 2nd grade of current transformer can use the long-pending magnetic core of small cross sections, and promptly the sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core; Thereby reduce the material use amount of current transformer, reduce the manufacturing cost of current transformer.
Technical scheme six: a kind of current transformer; Comprise the end of the same name of main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, the non-same polarity that is connected secondary coil the 1st winding and secondary coil the 2nd winding load resistance, be connected the 1st of the 1st ancillary coil two ends and detect resistance, be connected the 2nd of the 2nd ancillary coil two ends and detect resistance, detect resistance until the n that is connected n ancillary coil two ends, n is the integer more than or equal to 2;
The 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 2nd ancillary coil; By that analogy; The ratio of resistance that detects resistance and the load resistance of resistance until n equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of n ancillary coil, and the ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; The 2nd group of primary winding and secondary coil the 2nd winding technique are on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core, by that analogy, is wound on the n auxiliary magnetic core until the n ancillary coil;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, is connected with the non-same polarity of n ancillary coil until the end of the same name of n-1;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of n ancillary coil and secondary coil the 1st winding is a signal output part; Perhaps, the non-same polarity of the end of the same name of n ancillary coil, secondary coil the 1st winding, the end of the same name of secondary coil the 2nd winding are signal output part, when needing current transformer to be output as three ends output signal, use.
Constitute the 1st grade of current transformer by main magnetic core, primary winding the 1st winding, secondary coil the 1st winding, secondary coil the 2nd winding and load resistance.
Detect resistance by the 1st auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, the 1st ancillary coil and the 1st and constitute the 2nd grade of current transformer.
Detect resistance by the 2nd auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, the 1st ancillary coil, the 2nd ancillary coil and the 2nd and constitute the 3rd level current transformer.
By that analogy, until:
Constitute n+1 level current transformer by n auxiliary magnetic core, primary winding the 2nd winding, secondary coil the 2nd winding, the 1st ancillary coil until n ancillary coil and n detection resistance.
For the 1st grade of current transformer and the 2nd grade of current transformer, following equation is arranged:
Ip*Np1?-?I1*Ns1?-?Iz1*Ns1?=0
Ip*Np2?-?I1*Ns2?-?I2*Nf1?-?Iz2*Nf1?=0
Np1/Ns1?=?Np2/Ns2
Iz1?=?E1/Z1
E1+E2?=?I1*R01?+?I1*R
Iz2?=?E2?/Z2
E2?=?I2*R02?+?I2*Rf1
Rf1/?R?=?Nf1/Ns2
Wherein:
Np1: the number of turn of primary winding the 1st winding;
Ns1: the number of turn of secondary coil the 1st winding;
Np2: the number of turn of primary winding the 2nd winding;
Ns2: the number of turn of secondary coil the 2nd winding;
Nf1: the number of turn of the 1st ancillary coil;
Ip: the electric current in primary winding the 1st winding and primary winding the 2nd winding;
I1: the electric current in secondary coil the 1st winding and secondary coil the 2nd winding;
I2: the electric current in the 1st ancillary coil;
Iz1: the exciting current of main magnetic core;
Iz2: the exciting current of the 1st auxiliary magnetic core;
E1: the induced potential on secondary coil the 1st winding;
E2: the induced potential on secondary coil the 2nd winding;
Z1: the excitation impedance of main magnetic core;
Z2: the excitation impedance of the 1st auxiliary magnetic core;
R01: total coil impedance of secondary coil the 1st winding and secondary coil the 2nd winding;
R02: the coil impedance of the 1st auxiliary magnetic core;
R: load resistance;
Rf1: the 1st detects resistance;
Find the solution above equation, then can obtain:
I1=(Np1/Ns1)*Ip*?(1-e1)
I2=(Np2/Nf1)*Ip*e1*?(1-e2)
e1?=[(R01?+?R)/Z1]/[1+(R01?+?R)/Z1?+k]
e2?=[(R02?+?Rf1)/Z2]/[1?+?(R02?+?Rf1)/Z2]
k=(Ns2/Nf1)*(Z2/Z1)*e2
By that analogy, until:
For n+1 level current transformer, following equation is arranged:
Ip*Np-I1*Ns-I2*Nf1–……–I(n+1)*Nfn–Iz(n+1)*Nfn?=0
Iz(n+1)?=?E(n+1)?/Z(n+1)
E(n+1)?=?I(n+1)*R0(n+1)?+?I(n+1)*Rfn
Rfn/R?=?Nfn/Ns
Wherein:
Nfn: the number of turn of n ancillary coil;
I (n+1): the electric current in the n ancillary coil;
Iz (n+1): the exciting current of n auxiliary magnetic core;
E (n+1): the induced potential on the n ancillary coil;
Z (n+1): the excitation impedance of n auxiliary magnetic core;
R0 (n+1): the coil impedance of n auxiliary magnetic core;
Rfn: n detects resistance;
Find the solution above equation, then can obtain:
I(n+1)=(Np/Nfn)*Ip*e1*e2*……*[1-e(n+1)]
e(n+1)?={[R0(n+1)?+?Rfn]/Z(n+1)}/{1?+?[R0(n+1)?+?Rfn)]/Z(n+1)}
The measure error of (n+1) level current transformer is: e (n+1), and be negative value.
Since the 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 2nd ancillary coil; By that analogy; The ratio of resistance that detects resistance and the load resistance of resistance until n equals the ratio of the number of turn of the number of turn and the secondary coil of n ancillary coil, so have:
Rf1/R?=?Nf1/Ns
Rf2/R?=?Nf2/Ns
By that analogy, until:
Rfn/R?=?Nfn/Ns
Voltage between the end of the same name of n ancillary coil and the non-same polarity of secondary coil is:
U?=?I1*R?+?I2*Rf1?+?……?+?I(n+1)*Rfn
U?=(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2*……*e(n+1)
U: the voltage between the end of the same name of n ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 until with the product of the measure error e (n+1) of n+1 level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
Preferably; When n equals 2, current transformer comprise the end of the same name of main magnetic core, the 1st auxiliary magnetic core, the 2nd auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, the 1st ancillary coil, the 2nd ancillary coil, the non-same polarity that is connected secondary coil the 1st winding and secondary coil the 2nd winding load resistance, be connected the 1st of the 1st ancillary coil two ends and detect resistance, be connected the 2nd of the 2nd ancillary coil two ends and detect resistance; The 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 2nd ancillary coil, the ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; The 2nd group of primary winding and secondary coil the 2nd winding technique are on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of the 2nd ancillary coil and secondary coil the 1st winding is a signal output part; Perhaps, the non-same polarity of the end of the same name of the 2nd ancillary coil, secondary coil the 1st winding, the end of the same name of secondary coil the 2nd winding are signal output part, when needing current transformer to be output as three ends output signal, use.
Voltage between the non-same polarity of the end of the same name of the 2nd ancillary coil and secondary coil the 1st winding is:
U?=(Np/Ns)*Ip*R*(1-e1*e2*e3)
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2*e3
U: the voltage between the end of the same name of the 2nd ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 and with the product of the measure error e3 of 3rd level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
Technical scheme seven: a kind of current transformer; Comprise main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding and secondary coil the 2nd winding and secondary coil the 2nd winding and ancillary coil are wound on the auxiliary magnetic core;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding;
The ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the two ends of ancillary coil and secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are as signal output part; Perhaps, the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil, and the non-same polarity of the two ends of ancillary coil and secondary coil the 1st winding is as signal output part.
During use; If the end of the same name of secondary coil the 2nd winding is not connected with the non-same polarity of ancillary coil; Then externally connect in the circuit; The non-same polarity of secondary coil the 1st winding and the end of the same name of secondary coil the 2nd winding are connected with load resistance in the external circuit; The ancillary coil two ends are connected with detection resistance in the external circuit, and when the ratio of the resistance of resistance that detects resistance and load resistance equaled the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of ancillary coil, the voltage between the non-same polarity of the end of the same name of ancillary coil and secondary coil the 1st winding was:
U?=(Np1/Ns1)*Ip*R*(1-e1*e2)
U?=(Np1/Ns1)*Ip*R*(1-e)
e?=?e1*e2
Np1: the number of turn of primary winding the 1st winding;
Ns1: the number of turn of secondary coil the 1st winding;
Ip: the electric current in primary winding the 1st winding and primary winding the 2nd winding;
R: load resistance;
E1: the measure error of the 1st grade of current transformer
E2: the measure error of the 2nd grade of current transformer
U: the voltage between the end of the same name of ancillary coil and the non-same polarity of secondary coil.
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer is the product of measure error e2 of measure error e1 and the 2nd grade of current transformer of the 1st grade of current transformer, and therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
The sectional area of auxiliary magnetic core can be less than the sectional area of main magnetic core, thereby reduces the material use amount of current transformer, reduces the manufacturing cost of current transformer.
Technical scheme eight: a kind of current transformer, comprise main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, n is the integer more than or equal to 2; The ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; Primary winding the 2nd winding and secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core; By that analogy, be wound on the n auxiliary magnetic core until the n ancillary coil;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, is connected with the non-same polarity of n ancillary coil until the ancillary coil end of the same name of n-1;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the 1st ancillary coil, the end of the same name of the 2nd ancillary coil, the end of the same name until the n ancillary coil, the end of the same name of secondary coil the 2nd winding, the non-same polarity of secondary coil the 1st winding are signal output part.
During use; The non-same polarity of secondary coil the 1st winding is connected with load resistance in the non-same polarity external circuit of ancillary coil; In the 1st ancillary coil two ends and the external circuit the 1st detects resistance and is connected; In the 2nd ancillary coil two ends and the external circuit the 2nd detects resistance and is connected, and by that analogy, is connected with n detection resistance in the external circuit until n ancillary coil two ends;
When the 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 2nd ancillary coil; When the ratio of resistance that by that analogy, detects resistance and the load resistance of resistance until n equals the ratio of the number of turn of the number of turn and secondary coil of n ancillary coil;
Voltage between the non-same polarity of the end of the same name of n ancillary coil and secondary coil the 1st winding is:
U?=(Np1/Ns1)*Ip*R*[1-e1*e2*……*e(n+1)]
U?=(Np/Ns)*Ip*R*(1-e)
e?=?e1*e2*……*e(n+1)
U: the voltage between the non-same polarity of the end of the same name of n ancillary coil and secondary coil the 1st winding
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 until with the product of the measure error e (n+1) of n+1 level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
Preferably; When n equaled 2, current transformer comprised main magnetic core, the 1st auxiliary magnetic core, the 2nd auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, the 1st ancillary coil, the 2nd ancillary coil; The ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the end of the same name of the 1st ancillary coil, the end of the same name of the 2nd ancillary coil, secondary coil the 2nd winding, the non-same polarity of secondary coil the 1st winding are signal output part.
During use; The non-same polarity of secondary coil the 1st winding and the end of the same name of secondary coil the 2nd winding are connected with load resistance in the external circuit; In the end of the same name of secondary coil the 2nd winding and the end of the same name of the 1st ancillary coil and the external circuit the 1st detects resistance and is connected, and the end of the same name of the 1st ancillary coil and the end of the same name of the 2nd ancillary coil are connected with the 2nd detection resistance in the external circuit;
When the 1st detect resistance the ratio of resistance and the resistance of load resistance equal the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 1st ancillary coil, when the ratio of the resistance of the 2nd detection resistance and the resistance of load resistance equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 2nd ancillary coil;
Voltage between the non-same polarity of the end of the same name of the 2nd ancillary coil and secondary coil the 1st winding is:
U?=(Np1/Ns1)*Ip*R*(1-e1*e2*e3)
U?=(Np1/Ns1)*Ip*R*(1-e)
e?=?e1*e2*e3
U: the voltage between the non-same polarity of the end of the same name of the 2nd ancillary coil and secondary coil the 1st winding
The measure error of current transformer is: e, and be negative value.
The measure error e of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 and with the product of the measure error e3 of 3rd level current transformer; Therefore, the measure error e of current transformer compares with the measure error e1 of the 1st grade of current transformer and wants much little.
In above-mentioned all technical schemes, can further be preferably: the sectional area of auxiliary magnetic core is less than the sectional area of main magnetic core, thus the material use amount of minimizing current transformer, the manufacturing cost of reduction current transformer.
Current transformer of the present invention has the high characteristics of certainty of measurement.
Description of drawings
Fig. 1 is the schematic diagram of conventional current instrument transformer.
Fig. 2 is the schematic diagram of the embodiment of the invention 1.
Fig. 3 is the schematic diagram of the embodiment of the invention 2.
Fig. 4 is the schematic diagram of the embodiment of the invention 3.
Fig. 5 is the schematic diagram of the embodiment of the invention 4.
Fig. 6 is the schematic diagram of the embodiment of the invention 5.
Fig. 7 is the schematic diagram of the embodiment of the invention 6.
Fig. 8 is the schematic diagram of the embodiment of the invention 7.
Fig. 9 is the schematic diagram of the embodiment of the invention 8.
Figure 10 is the schematic diagram of the embodiment of the invention 9.
Figure 11 is the schematic diagram of the embodiment of the invention 10.
Figure 12 is the schematic diagram of the embodiment of the invention 11.
Figure 13 is the schematic diagram of the embodiment of the invention 12.
Figure 14 is the schematic diagram of the embodiment of the invention 13.
Figure 15 is the schematic diagram of the embodiment of the invention 14.
Figure 16 is the schematic diagram of the embodiment of the invention 15.
Figure 17 is the schematic diagram of the embodiment of the invention 16.
Figure 18 is the schematic diagram of the embodiment of the invention 17.
Figure 19 is the schematic diagram of the embodiment of the invention 18.
Figure 20 is the schematic diagram of the embodiment of the invention 19.
Figure 21 is the schematic diagram of the embodiment of the invention 20.
Annotate: among each figure, the end that coil indicates " * " is an end of the same name, and the other end is a non-same polarity.
Embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1: as shown in Figure 2; The present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding 3, secondary coil 4, ancillary coil 5, be connected secondary coil 4 two ends load resistance 6, be connected the detection resistance 7 at ancillary coil 5 two ends; The resistance that detects resistance equals the resistance of load resistance; The number of turn of ancillary coil equals the number of turn of secondary coil; Primary winding and secondary coil are wound on main magnetic core and the auxiliary magnetic core, and ancillary coil is wound on the auxiliary magnetic core, and the non-same polarity of ancillary coil is connected with the end of the same name of secondary coil; The two ends of primary winding are current input terminal, and the end of the same name of ancillary coil and the non-same polarity of secondary coil are signal output part.
Voltage between the end of the same name of ancillary coil and the non-same polarity of secondary coil is:
U?=(Np/Ns)*Ip*R*(1-e1*e2)
The measure error of current transformer is the product of measure error e2 of measure error e1 and the 2nd grade of current transformer of the 1st grade of current transformer.
The sectional area of auxiliary magnetic core is less than the sectional area of main magnetic core.
Embodiment 2: as shown in Figure 3; Present embodiment is on the basis of embodiment 1; The end of the same name of setting up secondary coil is a signal output part; Be that the end of the same name of ancillary coil, the end of the same name of secondary coil and the non-same polarity of secondary coil are signal output part, when needing current transformer to be output as three ends output signal, use.
Embodiment 3: as shown in Figure 4; The present embodiment current transformer comprises: main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, primary winding 3, secondary coil the 4, the 1st ancillary coil the 5, the 2nd ancillary coil 9, be connected secondary coil 4 two ends load resistance 6, be connected the 1st of the 1st ancillary coil 5 two ends and detect resistance 7, be connected the 2nd of the 2nd ancillary coil 9 two ends and detect resistance 10; The resistance of the 1st detection resistance equals the resistance of load resistance; The resistance of the 2nd detection resistance equals the resistance of load resistance; The number of turn of the 1st ancillary coil equals the number of turn of secondary coil, and the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil, and primary winding and secondary coil are wound on main magnetic core, the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core, and the non-same polarity of the 1st ancillary coil is connected with the end of the same name of secondary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; The two ends of primary winding are current input terminal, and the end of the same name of the 2nd ancillary coil and the non-same polarity of secondary coil are signal output part.
Voltage between the end of the same name of the 2nd ancillary coil and the non-same polarity of secondary coil is:
U?=(Np/Ns)*Ip*R*(1-e1*e2*e3)
The measure error of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 and with the product of the measure error e3 of 3rd level current transformer.
Embodiment 4: as shown in Figure 5; Present embodiment is on the basis of embodiment 3; The end of the same name of setting up secondary coil is a signal output part; Promptly the non-same polarity of the end of the same name of the end of the same name of the 2nd ancillary coil, secondary coil and secondary coil is a signal output part, when needing current transformer to be output as three ends output signal, uses.
Embodiment 5: as shown in Figure 6; The present embodiment current transformer comprises: main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, until n auxiliary magnetic core 11, primary winding 3, secondary coil the 4, the 1st ancillary coil the 5, the 2nd ancillary coil 9, until n ancillary coil 12, be connected secondary coil 4 two ends load resistance 6, be connected the 1st of the 1st ancillary coil 5 two ends and detect resistance 7, be connected the 2nd of the 2nd ancillary coil 9 two ends and detect resistance 10, detect resistance 13 until the n that is connected n ancillary coil 12 two ends; N is the integer more than or equal to 2; The resistance of the 1st detection resistance equals the resistance of load resistance; The resistance of the 2nd detection resistance equals the resistance of load resistance, by that analogy, equals the resistance of load resistance until the resistance of n detection resistance; The number of turn of the 1st ancillary coil equals the number of turn of secondary coil; The number of turn of the 2nd ancillary coil equals the number of turn of secondary coil, by that analogy, equals the number of turn of secondary coil until the number of turn of n ancillary coil; Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core; By that analogy, be wound on the n auxiliary magnetic core until the n ancillary coil; The end of the same name of secondary coil is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; By that analogy; End of the same name until the n-1 ancillary coil is connected with the non-same polarity of n ancillary coil, and the two ends of primary winding are current input terminal, and the end of the same name of n ancillary coil and the non-same polarity of secondary coil are signal output part.
Voltage between the end of the same name of n ancillary coil and the non-same polarity of secondary coil is:
U?=(Np/Ns)*Ip*R*[1-e1*e2*……*e(n+1)]
The measure error of current transformer be the 1st grade of current transformer measure error e1 and the 2nd grade of current transformer measure error e2 until with the product of the measure error e (n+1) of (n+1) level current transformer.
Embodiment 6: as shown in Figure 7; Present embodiment is on the basis of embodiment 5; The end of the same name of setting up secondary coil is a signal output part; Promptly the non-same polarity of the end of the same name of the end of the same name of n ancillary coil, secondary coil and secondary coil is a signal output part, when needing current transformer to be output as three ends output signal, uses.
Embodiment 7: as shown in Figure 8; The present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding 3, secondary coil 4, ancillary coil 5; The number of turn of ancillary coil equals the number of turn of secondary coil; Primary winding and secondary coil are wound on main magnetic core and the auxiliary magnetic core, and ancillary coil is wound on the auxiliary magnetic core, and the end of the same name of secondary coil is connected with the non-same polarity of ancillary coil; The two ends of primary winding are current input terminal, and the end of the same name of ancillary coil and the two ends of secondary coil are signal output part.
Embodiment 8: as shown in Figure 9; The present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding 3, secondary coil 4, ancillary coil 5; The number of turn of ancillary coil equals the number of turn of secondary coil, and primary winding and secondary coil are wound on main magnetic core and the auxiliary magnetic core, and ancillary coil is wound on the auxiliary magnetic core; The two ends of primary winding are current input terminal, and the two ends of ancillary coil and the two ends of secondary coil are signal output part.
Embodiment 9: shown in figure 10; The present embodiment current transformer comprises: main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, primary winding 3, secondary coil the 4, the 1st ancillary coil the 5, the 2nd ancillary coil 9; The number of turn of the 1st ancillary coil equals the number of turn of secondary coil; The number of turn of the 2nd ancillary coil equals the number of turn of secondary coil; Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 1st ancillary coil is wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core; The non-same polarity of the 1st ancillary coil is connected with the end of the same name of secondary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, and the two ends of primary winding are current input terminal, and the two ends of the end of the same name of the 2nd ancillary coil, the end of the same name of the 1st ancillary coil and secondary coil are signal output part.
Embodiment 10: shown in figure 11; Present embodiment comprises: main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, until n auxiliary magnetic core 11, primary winding 3, secondary coil the 4, the 1st ancillary coil the 5, the 2nd ancillary coil 9, until n ancillary coil 12; N is the integer more than or equal to 2, and the number of turn of the 1st ancillary coil equals the number of turn of secondary coil, and the number of turn of the 2nd ancillary coil equals the number of turn of secondary coil; Equal the number of turn of secondary coil until the number of turn of n ancillary coil; Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n auxiliary magnetic core, and the 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core; By that analogy; Be wound on the n auxiliary magnetic core until the n ancillary coil, the end of the same name of secondary coil is connected with the non-same polarity of the 1st ancillary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; By that analogy; End of the same name until the n-1 ancillary coil is connected with the non-same polarity of n ancillary coil, and the two ends of primary winding are current input terminal, the end of the same name of the 1st ancillary coil, the end of the same name of the 2nd ancillary coil, is signal output part until the end of the same name of n ancillary coil and the two ends of secondary coil.
Embodiment 11: shown in figure 12; The present embodiment current transformer comprises: the load resistance 6 of the end of the same name of main magnetic core 1, auxiliary magnetic core 2, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, ancillary coil 5, the non-same polarity that is connected secondary coil the 1st winding 41 and secondary coil the 2nd winding 42, be connected the detection resistance 7 at ancillary coil 5 two ends; The resistance that detects resistance equals the resistance of load resistance; The number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding; The number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding; The number of turn of ancillary coil equals the number of turn of secondary coil the 2nd winding; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; Primary winding the 2nd winding, secondary coil the 2nd winding and ancillary coil are wound on the auxiliary magnetic core; The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil; The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of ancillary coil and secondary coil the 1st winding is a signal output part.
Embodiment 12: shown in figure 13; Present embodiment is on the basis of embodiment 11; The end of the same name of setting up secondary coil the 2nd winding is a signal output part; Be that the end of the same name of ancillary coil, the end of the same name of secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part, when needing current transformer to be output as three ends output signal, use.
Embodiment 13: shown in figure 14; The present embodiment current transformer comprises: the load resistance 6 of the end of the same name of main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding the 42, the 1st ancillary coil the 5, the 2nd ancillary coil 9, the non-same polarity that is connected secondary coil the 1st winding 41 and secondary coil the 2nd winding 42, be connected the 1st of the 1st ancillary coil 5 two ends and detect resistance 7, be connected the 2nd of the 2nd ancillary coil 9 two ends and detect resistance 10; The resistance of the 1st detection resistance equals the resistance of load resistance; The resistance of the 2nd detection resistance equals the resistance of load resistance; The number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding; The number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding; The number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding; The number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core; The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of the 2nd ancillary coil and secondary coil the 1st winding is a signal output part.
Embodiment 14: shown in figure 15; Present embodiment is on the basis of embodiment 13; The end of the same name of setting up secondary coil the 2nd winding is a signal output part; Promptly the non-same polarity of the end of the same name of the end of the same name of the 2nd ancillary coil, secondary coil the 2nd winding and secondary coil the 1st winding is a signal output part, when needing current transformer to be output as three ends output signal, uses.
Embodiment 15: shown in figure 16; The present embodiment current transformer comprises: main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, until n auxiliary magnetic core 11, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding the 42, the 1st ancillary coil the 5, the 2nd ancillary coil 9, until the load resistance 6 of the end of the same name of n ancillary coil 12, the non-same polarity that is connected secondary coil the 1st winding 41 and secondary coil the 2nd winding 42, be connected the 1st of the 1st ancillary coil 5 two ends and detect resistance 7, be connected the 2nd of the 2nd ancillary coil 9 two ends and detect resistance 10, detect resistance 13 until the n that is connected n ancillary coil 12 two ends; The resistance of the 1st detection resistance equals the resistance of load resistance; The resistance of the 2nd detection resistance equals the resistance of load resistance; Equal the resistance of load resistance until the resistance of n detection resistance; The number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding; The number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding; The number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding; The number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding; Equal the number of turn of secondary coil the 2nd winding until the number of turn of n ancillary coil; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core, and the 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core; Be wound on the n auxiliary magnetic core until the n ancillary coil; The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; End of the same name until the n-1 ancillary coil is connected with the non-same polarity of n ancillary coil, and the end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of n ancillary coil and secondary coil the 1st winding is a signal output part.
Embodiment 16: shown in figure 17; Present embodiment is on the basis of embodiment 15; The end of the same name of setting up secondary coil the 2nd winding is a signal output part; Promptly the non-same polarity of the end of the same name of the end of the same name of n ancillary coil, secondary coil the 2nd winding and secondary coil the 1st winding is a signal output part, when needing current transformer to be output as three ends output signal, uses.
Embodiment 17: shown in figure 18; The present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, ancillary coil 5; The number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding; The number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding; The number of turn of ancillary coil equals the number of turn of secondary coil the 2nd winding; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; Primary winding the 2nd winding, secondary coil the 2nd winding and ancillary coil are wound on the auxiliary magnetic core; The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil; The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the end of the same name of ancillary coil, secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
Embodiment 18: shown in figure 19; The present embodiment current transformer comprises: main magnetic core 1, auxiliary magnetic core 2, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding 42, ancillary coil 5; The number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding; The number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding; The number of turn of ancillary coil equals the number of turn of secondary coil the 2nd winding; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; Primary winding the 2nd winding, secondary coil the 2nd winding and ancillary coil are wound on the auxiliary magnetic core, and the end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the two ends of ancillary coil, secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
Embodiment 19: shown in figure 20; The present embodiment current transformer comprises: main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding the 42, the 1st ancillary coil the 5, the 2nd ancillary coil 9; The number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding; The number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding; The number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding; The number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; Primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core and the 2nd auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core, and the end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, and the end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the end of the same name of the 2nd ancillary coil, the end of the same name of the 1st ancillary coil, secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
Embodiment 20: shown in figure 21; The present embodiment current transformer comprises: main magnetic core the 1, the 1st auxiliary magnetic core the 2, the 2nd auxiliary magnetic core 8, until n auxiliary magnetic core 11, primary winding the 1st winding 31, primary winding the 2nd winding 32, secondary coil the 1st winding 41, secondary coil the 2nd winding the 42, the 1st ancillary coil the 5, the 2nd ancillary coil 9, until n ancillary coil 12; The number of turn of primary winding the 1st winding equals the number of turn of primary winding the 2nd winding; The number of turn of secondary coil the 1st winding equals the number of turn of secondary coil the 2nd winding; The number of turn of the 1st ancillary coil equals the number of turn of secondary coil the 2nd winding; The number of turn of the 2nd ancillary coil equals the number of turn of secondary coil the 2nd winding; Equal the number of turn of secondary coil the 2nd winding until the number of turn of n ancillary coil; Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; Primary winding the 2nd winding, secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core, is wound on the n auxiliary magnetic core until the n ancillary coil, and the end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil, and the end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, is connected with the non-same polarity of n ancillary coil until the end of the same name of n-1 ancillary coil; The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the 1st ancillary coil, the end of the same name of the 2nd ancillary coil, the end of the same name until the n ancillary coil, the end of the same name of secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are signal output part.
More than the preferred embodiments of the present invention have been done detailed description, as far as those of ordinary skill in the art, in the above-mentioned embodiment part that can change, and these changes also should be regarded as protection scope of the present invention.
Claims (10)
1. current transformer; It is characterized in that: comprise main magnetic core, auxiliary magnetic core, primary winding, secondary coil, ancillary coil, be connected the secondary coil two ends load resistance, be connected the detection resistance at ancillary coil two ends; The ratio of resistance that detects resistance and the load resistance of resistance equals the ratio of the number of turn of the number of turn and the secondary coil of ancillary coil; Primary winding and secondary coil are wound on main magnetic core and the auxiliary magnetic core; Ancillary coil is wound on the auxiliary magnetic core; The end of the same name of the non-same polarity of ancillary coil and secondary coil is connected, and the two ends of primary winding are current input terminal, and the end of the same name of ancillary coil and the non-same polarity of secondary coil are signal output part; Perhaps, the two ends of the end of the same name of ancillary coil and secondary coil are signal output part.
2. current transformer; It is characterized in that: comprise main magnetic core, a n auxiliary magnetic core, primary winding, secondary coil, a n ancillary coil, be connected the secondary coil two ends load resistance, be connected the 1st of the 1st ancillary coil two ends and detect resistance, be connected the 2nd of the 2nd ancillary coil two ends and detect resistance, detect resistance until the n that is connected n ancillary coil two ends; N is the integer more than or equal to 2; The 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and the secondary coil of the 2nd ancillary coil; By that analogy, the ratio of resistance that detects resistance and the load resistance of resistance until n equals the ratio of the number of turn of the number of turn and the secondary coil of n ancillary coil;
Primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core; By that analogy, be wound on the n auxiliary magnetic core until the n ancillary coil;
The end of the same name of secondary coil is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; By that analogy, the end of the same name until the n-1 ancillary coil is connected with the non-same polarity of n ancillary coil;
The two ends of primary winding are current input terminal, and the end of the same name of n ancillary coil and the non-same polarity of secondary coil are signal output part; Perhaps, the two ends of the end of the same name of n ancillary coil and secondary coil are signal output part.
3. current transformer, it is characterized in that: comprise main magnetic core, auxiliary magnetic core, primary winding, secondary coil, ancillary coil, primary winding and secondary coil are wound on main magnetic core and the auxiliary magnetic core, and ancillary coil is wound on the auxiliary magnetic core;
The two ends of primary winding are current input terminal, and the two ends of ancillary coil and the two ends of secondary coil are signal output part; Perhaps, the end of the same name of the non-same polarity of ancillary coil and secondary coil is connected, and the end of the same name of ancillary coil and the two ends of secondary coil are signal output part.
4. current transformer as claimed in claim 3 is characterized in that: the sectional area of auxiliary magnetic core is less than the sectional area of main magnetic core.
5. current transformer; It is characterized in that: comprise main magnetic core, a n auxiliary magnetic core, primary winding, secondary coil, a n ancillary coil, n is the integer more than or equal to 2, and primary winding and secondary coil are wound on main magnetic core and the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core, by that analogy, is wound on the n auxiliary magnetic core until the n ancillary coil;
The end of the same name of secondary coil is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil; By that analogy, the end of the same name until the n-1 ancillary coil is connected with the non-same polarity of n ancillary coil;
The two ends of primary winding are current input terminal, and the end of the same name of n ancillary coil and the two ends of secondary coil are signal output part.
6. current transformer is characterized in that: comprise the end of the same name of main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil, the non-same polarity that is connected secondary coil the 1st winding and secondary coil the 2nd winding load resistance, be connected the detection resistance at ancillary coil two ends;
The ratio of resistance that detects resistance and the load resistance of resistance equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of ancillary coil, and the ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and the 2nd group of primary winding and secondary coil the 2nd winding and ancillary coil are wound on the auxiliary magnetic core;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding, and the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of ancillary coil and secondary coil the 1st winding is a signal output part; Perhaps, the non-same polarity of the end of the same name of the end of the same name of ancillary coil, secondary coil the 2nd winding and secondary coil the 1st winding is a signal output part.
7. current transformer; It is characterized in that: comprise the end of the same name of main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, the non-same polarity that is connected secondary coil the 1st winding and secondary coil the 2nd winding load resistance, be connected the 1st of the 1st ancillary coil two ends and detect resistance, be connected the 2nd of the 2nd ancillary coil two ends and detect resistance, detect resistance until the n that is connected n ancillary coil two ends, n is the integer more than or equal to 2;
The 1st detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 1st ancillary coil; The 2nd detect resistance and the load resistance of resistance the ratio of resistance equal the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of the 2nd ancillary coil; By that analogy; The ratio of resistance that detects resistance and the load resistance of resistance until n equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of n ancillary coil, and the ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; The 2nd group of primary winding and secondary coil the 2nd winding technique are on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 1st ancillary coil is wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core, by that analogy, is wound on the n auxiliary magnetic core until the n ancillary coil;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, is connected with the non-same polarity of n ancillary coil until the end of the same name of n-1;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the non-same polarity of the end of the same name of n ancillary coil and secondary coil the 1st winding is a signal output part; Perhaps, the non-same polarity of the end of the same name of the end of the same name of n ancillary coil, secondary coil the 2nd winding, secondary coil the 1st winding is a signal output part.
8. a current transformer is characterized in that: comprise main magnetic core, auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, ancillary coil;
The ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core, and primary winding the 2nd winding and secondary coil the 2nd winding and ancillary coil are wound on the auxiliary magnetic core;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding, and the end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the two ends of ancillary coil and secondary coil the 2nd winding and the non-same polarity of secondary coil the 1st winding are as signal output part; Perhaps, the end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of ancillary coil, and the non-same polarity of the two ends of ancillary coil and secondary coil the 1st winding is as signal output part.
9. current transformer as claimed in claim 8 is characterized in that: the sectional area of auxiliary magnetic core is less than the sectional area of main magnetic core.
10. current transformer, it is characterized in that: comprise main magnetic core, a n auxiliary magnetic core, primary winding the 1st winding, primary winding the 2nd winding, secondary coil the 1st winding, secondary coil the 2nd winding, a n ancillary coil, n is the integer more than or equal to 2;
The ratio of the number of turn of the number of turn of primary winding the 1st winding and secondary coil the 1st winding equals the ratio of the number of turn of the number of turn and secondary coil the 2nd winding of primary winding the 2nd winding;
Primary winding the 1st winding and secondary coil the 1st winding technique are on main magnetic core; Primary winding the 2nd winding and secondary coil the 2nd winding and the 1st ancillary coil are wound on the 1st auxiliary magnetic core to the n auxiliary magnetic core; The 2nd ancillary coil is wound on the 2nd auxiliary magnetic core to the n auxiliary magnetic core; By that analogy, be wound on the n auxiliary magnetic core until the n ancillary coil;
The end of the same name of primary winding the 1st winding is connected with the non-same polarity of primary winding the 2nd winding; The end of the same name of secondary coil the 1st winding is connected with the non-same polarity of secondary coil the 2nd winding; The end of the same name of secondary coil the 2nd winding is connected with the non-same polarity of the 1st ancillary coil; The end of the same name of the 1st ancillary coil is connected with the non-same polarity of the 2nd ancillary coil, by that analogy, is connected with the non-same polarity of n ancillary coil until the ancillary coil end of the same name of n-1;
The end of the same name of the non-same polarity of primary winding the 1st winding and primary winding the 2nd winding is a current input terminal, and the end of the same name of the 1st ancillary coil, the end of the same name of the 2nd ancillary coil, the end of the same name until the n ancillary coil, the end of the same name of secondary coil the 2nd winding, the non-same polarity of secondary coil the 1st winding are signal output part.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210209079.XA CN102709042B (en) | 2012-06-21 | 2012-06-21 | Current transformer |
| PCT/CN2013/077581 WO2013189297A1 (en) | 2012-06-21 | 2013-06-20 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210209079.XA CN102709042B (en) | 2012-06-21 | 2012-06-21 | Current transformer |
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| Publication Number | Publication Date |
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| CN102709042A true CN102709042A (en) | 2012-10-03 |
| CN102709042B CN102709042B (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210209079.XA Active CN102709042B (en) | 2012-06-21 | 2012-06-21 | Current transformer |
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| Country | Link |
|---|---|
| CN (1) | CN102709042B (en) |
| WO (1) | WO2013189297A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013189297A1 (en) * | 2012-06-21 | 2013-12-27 | Chen Decai | Current transformer |
| CN104332297A (en) * | 2014-09-19 | 2015-02-04 | 国家电网公司 | Current transformer for microcomputer protection device |
| CN106298214A (en) * | 2016-09-23 | 2017-01-04 | 国网江西省电力公司电力科学研究院 | A kind of wide-range Zero flux current ratio changer |
| CN104090146B (en) * | 2014-07-24 | 2017-01-18 | 中国科学院上海应用物理研究所 | Alternating current/direct current sensor |
| CN107424815A (en) * | 2017-08-18 | 2017-12-01 | 陈宇斯 | A kind of two-stage current transformer compensated using circle is subtracted |
| CN109754998A (en) * | 2019-03-06 | 2019-05-14 | 陈德才 | A kind of active two-stage current transformer |
| WO2019100996A1 (en) * | 2017-11-25 | 2019-05-31 | 华为技术有限公司 | Current transformer |
| CN113161134A (en) * | 2021-04-15 | 2021-07-23 | 上海置信智能电气有限公司 | anti-DC component two-stage current transformer |
| WO2022001085A1 (en) * | 2020-07-01 | 2022-01-06 | 南京丹迪克电力仪表有限公司 | Method for preparing high-accuracy dual-stage clamp-shaped current transformer |
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| CN109683009A (en) * | 2019-01-17 | 2019-04-26 | 上海崇林汽车电子有限公司 | A kind of magnetic circuit device of large range high precision Hall current sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2632377C2 (en) * | 1976-07-19 | 1987-10-01 | Richard Dr.-Ing. Friedl | |
| CN1048627A (en) * | 1990-08-02 | 1991-01-16 | 李保业 | The current transformer of high permeance |
| WO1996001432A1 (en) * | 1994-07-01 | 1996-01-18 | Rmd Electronics Pty. Ltd. | Improved clipon ct |
| CN2221216Y (en) * | 1995-02-06 | 1996-02-28 | 电力工业部电力科学研究院 | Small current high accuracy current sensor |
| US20030137382A1 (en) * | 2001-12-03 | 2003-07-24 | Mayfield Glenn A. | Transformers |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6579920B2 (en) * | 2001-07-02 | 2003-06-17 | Prizmalite | Friction pads and disks and compositions and methods for producing same |
| CN102709042B (en) * | 2012-06-21 | 2015-06-10 | 陈德才 | Current transformer |
-
2012
- 2012-06-21 CN CN201210209079.XA patent/CN102709042B/en active Active
-
2013
- 2013-06-20 WO PCT/CN2013/077581 patent/WO2013189297A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2632377C2 (en) * | 1976-07-19 | 1987-10-01 | Richard Dr.-Ing. Friedl | |
| CN1048627A (en) * | 1990-08-02 | 1991-01-16 | 李保业 | The current transformer of high permeance |
| WO1996001432A1 (en) * | 1994-07-01 | 1996-01-18 | Rmd Electronics Pty. Ltd. | Improved clipon ct |
| CN2221216Y (en) * | 1995-02-06 | 1996-02-28 | 电力工业部电力科学研究院 | Small current high accuracy current sensor |
| US20030137382A1 (en) * | 2001-12-03 | 2003-07-24 | Mayfield Glenn A. | Transformers |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013189297A1 (en) * | 2012-06-21 | 2013-12-27 | Chen Decai | Current transformer |
| CN104090146B (en) * | 2014-07-24 | 2017-01-18 | 中国科学院上海应用物理研究所 | Alternating current/direct current sensor |
| CN104332297A (en) * | 2014-09-19 | 2015-02-04 | 国家电网公司 | Current transformer for microcomputer protection device |
| CN106298214A (en) * | 2016-09-23 | 2017-01-04 | 国网江西省电力公司电力科学研究院 | A kind of wide-range Zero flux current ratio changer |
| CN107424815A (en) * | 2017-08-18 | 2017-12-01 | 陈宇斯 | A kind of two-stage current transformer compensated using circle is subtracted |
| CN107424815B (en) * | 2017-08-18 | 2019-04-30 | 陈宇斯 | A kind of two-stage current transformer compensated using circle is subtracted |
| CN111771250A (en) * | 2017-11-25 | 2020-10-13 | 华为技术有限公司 | Current transformer |
| WO2019100996A1 (en) * | 2017-11-25 | 2019-05-31 | 华为技术有限公司 | Current transformer |
| CN111771250B (en) * | 2017-11-25 | 2022-08-26 | 华为技术有限公司 | Current transformer |
| US11742139B2 (en) | 2017-11-25 | 2023-08-29 | Huawei Technologies Co., Ltd. | Current transformer |
| CN109754998B (en) * | 2019-03-06 | 2020-07-21 | 陈德才 | Active two-stage current transformer |
| CN109754998A (en) * | 2019-03-06 | 2019-05-14 | 陈德才 | A kind of active two-stage current transformer |
| WO2022001085A1 (en) * | 2020-07-01 | 2022-01-06 | 南京丹迪克电力仪表有限公司 | Method for preparing high-accuracy dual-stage clamp-shaped current transformer |
| CN113161134A (en) * | 2021-04-15 | 2021-07-23 | 上海置信智能电气有限公司 | anti-DC component two-stage current transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102709042B (en) | 2015-06-10 |
| WO2013189297A1 (en) | 2013-12-27 |
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Application publication date: 20121003 Assignee: ZHEJIANG ENHONG ELECTRONICS Co.,Ltd. Assignor: Chen Decai Contract record no.: 2016330000037 Denomination of invention: Secondary winding fixing method of current transformer Granted publication date: 20150610 License type: Common License Record date: 20160318 |
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Effective date of registration: 20220704 Address after: 314000 Building 1 and 2, No. 8, Kangding Road, Wutong street, Tongxiang City, Jiaxing City, Zhejiang Province Patentee after: ZHEJIANG ENHONG ELECTRONICS Co.,Ltd. Address before: 561000 No. 1, building 314, Shuangyang aircraft factory, Jichang Road, Xixiu District, Anshun City, Guizhou Province Patentee before: Chen Yusi Effective date of registration: 20220704 Address after: 561000 No. 1, building 314, Shuangyang aircraft factory, Jichang Road, Xixiu District, Anshun City, Guizhou Province Patentee after: Chen Yusi Address before: 310011 No. 304, building 5, ximingyuan, No. 165, Fengdeng street, Qinyuan Road, Gongshu District, Hangzhou, Zhejiang Province Patentee before: Chen Decai |
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