CN110581007A - Novel zero magnetic flux wide-range current transformer device - Google Patents
Novel zero magnetic flux wide-range current transformer device Download PDFInfo
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- CN110581007A CN110581007A CN201910863079.3A CN201910863079A CN110581007A CN 110581007 A CN110581007 A CN 110581007A CN 201910863079 A CN201910863079 A CN 201910863079A CN 110581007 A CN110581007 A CN 110581007A
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- secondary winding
- current
- compensation unit
- winding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2895—Windings disposed upon ring cores
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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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- 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
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
-
- 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
- H01F38/30—Constructions
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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
- H01F38/32—Circuit arrangements
-
- 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
- H01F38/30—Constructions
- H01F2038/305—Constructions with toroidal magnetic core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
- Transformers For Measuring Instruments (AREA)
Abstract
The invention discloses a novel zero-flux wide-range current transformer device, which comprises an annular iron core, a detection unit, a compensation unit and a processing unit, wherein a primary winding and a secondary winding are wound on the annular iron core, the primary winding sequentially penetrates and winds the annular iron core for N1 turns, the secondary winding sequentially penetrates and winds the annular iron core for N2 turns, the detection unit is connected to two ends of the secondary winding, and one end of the secondary winding is connected to a power ground end; two input ends of the processing unit are respectively connected to two ends of the secondary winding, and an output end of the processing unit is connected to a control end of the compensation unit; the invention has novel design idea, and realizes the measurement of wide-range current by injecting reverse current to the secondary winding in real time through the compensation unit.
Description
Technical Field
the invention relates to the technical field of current transformers, in particular to a novel zero-flux wide-range current transformer device.
Background
The current transformer is an instrument for measuring by converting a large primary side current into a small secondary side current according to the electromagnetic induction principle. The current transformer is composed of a closed iron core and a winding. The primary side winding of the transformer has few turns and is connected in a circuit of the current to be measured. Therefore, all current of a line always flows through the current transformer, the number of turns of the secondary side winding is large, the secondary side winding is connected in series in the measuring instrument and the protection loop, and the secondary side loop of the current transformer is always closed when the current transformer works, so that the impedance of the series coil of the measuring instrument and the protection loop is small, and the working state of the current transformer is close to a short circuit. The current transformer converts a large current on the primary side into a small current on the secondary side for measurement, and the secondary side can not be opened. The current in the lines of power generation, transformation, transmission, distribution and utilization is very different, from several amperes to several tens of thousands of amperes. For the convenience of measurement, protection and control, conversion to a more uniform current is required, and in addition, the voltage on the line is generally higher, which is very dangerous if the direct measurement is carried out. The current transformer plays the role of current transformation and electric isolation. Similar to a transformer, the current transformer also works according to the electromagnetic induction principle, the transformer converts voltage, and the current transformer converts current. The current transformer is connected with a winding (the number of turns is N1) of a current to be measured, and the winding is called a primary winding (or a primary winding and a primary winding); the winding (N2 turns) connected to the meter is called the secondary winding (or secondary winding, secondary winding).
The existing current transformer is designed only aiming at parameters at a certain working point and is fixed parameters. When the working range of the current transformer is changed greatly, the preset parameters cannot track the change in the full range, and the precision in the full range is ensured. And the iron core of the existing current transformer is easily saturated under the overload condition, and the condition that the saturation is generated due to the overload of large current cannot be processed.
Disclosure of Invention
the invention aims to provide a novel zero-flux wide-range current transformer device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a novel zero magnetic flux wide range current transformer device, includes toroidal core, detecting element, compensating unit and processing unit, the winding has primary winding and secondary winding on the toroidal core, primary winding wears to wind totally N1 circles on the toroidal core according to the order of sequence in proper order, secondary winding wears to wind totally N2 circles on the toroidal core according to the order in proper order, detecting element receives secondary winding's both ends, inserts power ground with secondary winding one end simultaneously.
Preferably, two input ends of the processing unit are respectively connected to two ends of the secondary winding, and an output end of the processing unit is connected to a control end of the compensation unit; the output end of the compensation unit is connected to one end of the secondary winding, and the output end of the compensation unit is connected to external equipment.
Preferably, the using method comprises the following steps:
A. When a certain current is conducted on the primary winding, the secondary winding generates a corresponding induced current, and because the detection unit exists, an induced potential difference is generated at nodes P1 and P2 in a loop of the secondary winding;
B. The potential difference is processed and output to the signal through the processing unit, the output signal of the processing unit is connected to the controllable compensation unit, and the controllable compensation unit is controlled to output the variable current;
C. The output current signal can be reversely injected to the node P2, so that the potential difference between the node P1 and the node P2 in the secondary winding loop is finally zero, and the current signal output by the compensation unit is the secondary loop current signal.
Compared with the prior art, the invention has the beneficial effects that: the invention has novel design thought, realizes the measurement of wide-range current by injecting reverse current into a secondary winding in real time through a compensation unit, when working, when certain current is conducted on a primary winding, the secondary winding can generate corresponding induced current, because of the existence of a detection unit, induced potential difference can be generated at nodes P1 and P2 in a secondary winding loop, the potential difference can process and output signals through a processing unit, the output signal of the processing unit is connected into a controllable compensation unit, the compensation unit is controlled to output variable current, the output current signal can be injected reversely into a node P2, finally the potential difference between the node P1 and the node P2 in the secondary winding loop is zero, the current signal output by the compensation unit is the secondary loop current signal, and the zero-flux current transformer based on secondary side applied analog quantity is easy to implement, and wide range is realized.
Drawings
fig. 1 is a schematic block diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present invention provides a technical solution: the utility model provides a novel zero magnetic flux wide range current transformer device, the device includes annular iron core 1, compensating unit 2 and processing unit 3, winding has primary winding 4 and secondary winding 5 on the annular iron core 1, primary winding 4 wears to wind annular iron core 1 according to the order of sequence totally N1 circles, secondary winding 5 wears to wind annular iron core 1 according to the order of sequence totally N2 circles in proper order, still includes detecting element 6, detecting element 6 connects secondary winding's both ends, inserts the power ground with secondary winding one end simultaneously.
In the invention, two input ends of a processing unit 3 are respectively connected to two ends of a secondary winding 5, and an output end of the processing unit 3 is connected to a control end of a compensation unit 2; the output end of the compensation unit 2 is connected to one end of the secondary winding, and the output end of the compensation unit 2 is connected to external equipment. The invention realizes the measurement of wide-range current by injecting reverse current to the secondary winding in real time through the compensation unit.
The working principle is as follows: when a certain current I1 is applied to the primary winding, the secondary winding will generate a corresponding induced current I2, and during the first phase: because of the presence of the detection unit, an induced potential difference, U, is generated at the nodes P1 and P2 in the secondary winding loopP2-UP1The potential difference is not equal to 0, the signal can be processed and output by the processing unit, the output signal of the processing unit is connected into the compensation unit, the compensation unit is controlled to output the variable current IA, the output current signal can be reversely injected to the node P2, when IA is-I2, the current flowing through the detection unit is 0, and finally the potential difference between the node P1 and the node P2 in the secondary winding loop is zero, namely U2P2-UP10, i.e. UP2＝UP1Zero magnetic flux is realized, and the current signal output by the compensation unit is the secondary loop current signal; in the second stage, when the potential difference between the two ends of the secondary winding becomes zero, the two input ends of the processing unit have no input signals, and the compensation unit has no output current signal to be reversely injected into the P2. At this time, current continues to pass through the primary winding, so that induced current continues to be generated in the corresponding secondary loop, and induced potential difference continues to be generated at the nodes P1 and P2, namely UP2-UP1Not equal to 0, the process in the first phase starts to repeat.
Because the primary winding continuously passes current, the secondary winding continuously generates induced current, and the process of two stages is continuously repeated on the loop of the secondary winding to realize dynamic zero magnetic flux, and the current output by the compensation unit is variable, so when the primary side current changes and the secondary side induced current changes, the compensation unit can change the corresponding output current according to the change of the induced current, thereby realizing the measurement of the current wide range in the zero magnetic flux state.
The current transformer can dynamically track the change of the primary current in a full range for the current transformer with larger change of the primary current, and can realize zero magnetic flux without only performing magnitude compensation on fixed parameters like the conventional transformer.
In conclusion, the invention has novel design idea, and the compensation unit of the compensation unit injects reverse current to the secondary winding in real time to realize measurement of wide-range current.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (3)
1. The utility model provides a novel zero magnetic flux wide range current transformer device, includes toroidal core (1), compensating unit (2) and processing unit (3), the winding has primary winding (4) and secondary winding (5) on toroidal core (1), primary winding (4) wear to wind toroidal core (1) in proper order altogether N1 circles in proper order, secondary winding (5) wear to wind toroidal core (1) in proper order altogether N2 circles in proper order, still include detecting element (6), detecting element (6) receive secondary winding's both ends, insert power ground with secondary winding one end simultaneously.
2. The novel zero-flux wide-range current transformer device according to claim 1, wherein: two input ends of the processing unit (3) are respectively connected to two ends of the secondary winding (5), and an output end of the processing unit (3) is connected to a control end of the compensation unit (2); the output end of the compensation unit (2) is connected to one end of the secondary winding, and the output end of the compensation unit (2) is connected to external equipment.
3. The use method for realizing the novel zero-flux wide-range current transformer device of claim 1 is characterized in that: the using method comprises the following steps:
A. When a certain current is conducted on the primary winding, the secondary winding generates a corresponding induced current, and because the detection unit exists, an induced potential difference is generated at nodes P1 and P2 in a loop of the secondary winding;
B. The potential difference is processed and output to the signal through the processing unit, the output signal of the processing unit is connected to the controllable compensation unit, and the controllable compensation unit is controlled to output the variable current;
C. the output current signal can be reversely injected to the node P2, so that the potential difference between the node P1 and the node P2 in the secondary winding loop is finally zero, and the current signal output by the compensation unit is the secondary loop current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910863079.3A CN110581007A (en) | 2019-09-12 | 2019-09-12 | Novel zero magnetic flux wide-range current transformer device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910863079.3A CN110581007A (en) | 2019-09-12 | 2019-09-12 | Novel zero magnetic flux wide-range current transformer device |
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| CN110581007A true CN110581007A (en) | 2019-12-17 |
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| CN201910863079.3A Pending CN110581007A (en) | 2019-09-12 | 2019-09-12 | Novel zero magnetic flux wide-range current transformer device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466526A (en) * | 2021-07-27 | 2021-10-01 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205427014U (en) * | 2016-03-30 | 2016-08-03 | 青岛乾程科技股份有限公司 | Antimagnetic formula current transformer of twin coil |
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2019
- 2019-09-12 CN CN201910863079.3A patent/CN110581007A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205427014U (en) * | 2016-03-30 | 2016-08-03 | 青岛乾程科技股份有限公司 | Antimagnetic formula current transformer of twin coil |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466526A (en) * | 2021-07-27 | 2021-10-01 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
| CN113466526B (en) * | 2021-07-27 | 2022-07-26 | 河北工业大学 | Residual current sensor circuit and circuit breaker |
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Application publication date: 20191217 |