CN112164559A - Self-adaptive variable-range current transformer - Google Patents
Self-adaptive variable-range current transformer Download PDFInfo
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- CN112164559A CN112164559A CN202010912999.2A CN202010912999A CN112164559A CN 112164559 A CN112164559 A CN 112164559A CN 202010912999 A CN202010912999 A CN 202010912999A CN 112164559 A CN112164559 A CN 112164559A
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- 238000004804 winding Methods 0.000 claims abstract description 135
- 230000003044 adaptive effect Effects 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
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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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Current Or Voltage (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
An adaptive variable range current transformer comprising: the current transformer comprises a primary winding, a secondary winding, a current transformer iron core and a control circuit. According to the self-adaptive variable-range current transformer, the number of turns of the secondary winding connected into a circuit can be automatically adjusted according to the current detection value of the secondary winding, so that the measurement range is changed, the problem that the measurement precision of the current transformer is reduced when a circuit is in a low-load operation state is solved, and the adaptability of the current transformer is improved; the invention fills the market gap and has great market application value.
Description
Technical Field
The invention belongs to the technical field of current transformers, and particularly relates to a self-adaptive variable-range current transformer.
Background
The current transformer is an important component of the electric power transmission and transformation equipment, is a communication element of a primary system and a secondary system of electric power, and is essential in the electric power system. In order to meet the requirements of devices such as a measuring instrument, relay protection, breaker failure judgment and fault filtering, current transformers with 2-8 secondary windings are required to be arranged in loops such as a generator, a transformer, an outgoing line, a bus section breaker, a bus breaker and a bypass breaker. At present, current transformers have multiple specifications such as 800/5, 500/5, 200/5 and 100/5, and current transformers with different specifications need to be selected for circuits with different currents to measure or protect. When the line is in a low-load operation state, the current transformer cannot work in a rated state, so that the current measurement precision is greatly reduced, but no current transformer which automatically adjusts the measurement range according to different measurement currents exists in the current market,
disclosure of Invention
In order to solve the above problems, the present invention provides an adaptive variable range current transformer, comprising:
a primary winding for connecting to a primary power system; the primary winding is connected with the primary power system;
a secondary winding for connecting a secondary power system; the secondary winding is connected with the secondary power system;
the current transformer iron core is used for connecting the primary winding and the secondary winding; the primary winding and the secondary winding are respectively wound on the current transformer iron core and are in coupling connection through the current transformer iron core;
the control circuit is used for detecting the current of the secondary winding and controlling the turn number of the secondary winding access circuit; the control circuit is connected with the secondary winding.
Preferably, the secondary winding includes a plurality of winding segments arranged in parallel, both ends of each of the winding segments are connected to the control circuit, and the control circuit controls the number of the winding segments connected to the circuit in the secondary winding according to the detection of the current of the secondary winding.
Preferably, the control circuit includes: the winding sections and the switches are connected in series in a one-to-one correspondence mode and are connected with the control circuit through the corresponding switches, and the control circuit controls the on-off of the switches to control the corresponding winding sections to be connected into the circuit or disconnected from the circuit.
Preferably, the winding segment includes: a first winding segment, a second winding segment, a third winding segment, and a fourth winding segment, the control circuit comprising: a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6 and a switch K7, wherein a first end of the first winding segment is connected to a first end of a detection device through a switch S1, a second end of the first winding segment is connected to a first end of the switch K7, a second end of the switch K7 is connected to a first end of a switch S2, a second end of the switch S2 is connected to a second end of the detection device, a first end of the second winding segment is connected to a first end of the switch K7 through the K1, a second end of the second winding segment is connected to a first end of the switch K6, a second end of the switch K6 is connected to a first end of the switch S2, a first end of the third winding segment is connected to a first end of the switch K6 through the K2, a second end of the third winding segment is connected to a first end of the switch K5, a second end of the switch K5 is connected to a second end of the switch S2, a first end of the fourth winding segment is connected to a first end of the switch K5 through the switch K3, a second end of the fourth winding segment is connected to a first end of the switch K4, and a second end of the switch K4 is connected to a first end of the switch S2.
Preferably, the control circuit includes: the device comprises a current-voltage conversion circuit, an AD conversion circuit, a processor, a relay drive circuit and a relay, wherein the AD conversion circuit is respectively connected with the current-voltage conversion circuit and the processor, the relay drive circuit is respectively connected with the processor and the relay, and the relay is respectively connected with the switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6 and the switch K7.
According to the self-adaptive variable-range current transformer, the number of turns of the secondary winding connected into a circuit can be automatically adjusted according to the current detection value of the secondary winding, so that the measurement range is changed, the problem that the measurement precision of the current transformer is reduced when a circuit is in a low-load operation state is solved, and the adaptability of the current transformer is improved; the invention fills the market gap and has great market application value.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an adaptive variable range current transformer provided by the present invention;
FIG. 2 is a schematic diagram of an adaptive variable range current transformer provided by the present invention;
fig. 3 is a schematic diagram of a control circuit in an adaptive variable-range current transformer provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1-3, in an embodiment of the present application, the present invention provides an adaptive variable-range current transformer, including: a primary winding 1, a secondary winding 2, a current transformer core 3, and a control circuit 4, each of which is described in detail below.
Referring to fig. 1 to 3, in an embodiment of the present application, an adaptive variable range current transformer provided by the present invention includes:
a primary winding 1 for connecting a primary power system; the primary winding 1 is connected with the primary power system;
a secondary winding 2 for connecting a secondary power system; the secondary winding 2 is connected with the secondary power system;
the current transformer iron core 3 is used for connecting the primary winding 1 and the secondary winding 2; the primary winding 1 and the secondary winding 2 are respectively wound on the current transformer iron core 3 and are coupled and connected through the current transformer iron core 3;
the control circuit 4 is used for detecting the current of the secondary winding 2 and controlling the turn number of the secondary winding 2 connected into the circuit; the control circuit 4 is connected to the secondary winding 2.
When the adaptive variable-range current transformer 20 is used, the primary winding 1 is connected with a primary power system, the secondary winding 2 is connected with a secondary power system, and the primary winding 1 and the secondary winding 2 are respectively wound on the current transformer core 3 and are coupled and connected through the current transformer core 3. The current in the primary power system generates a magnetic field in the primary winding 1, the magnetic field energy is transferred to the secondary winding 2 through the current transformer core 3, and a current is induced in the secondary winding 2. The induced current is output to the control circuit 4, the control circuit 4 can detect the magnitude relation between the secondary output current of the current transformer 20 and the minimum value of the rated working state current, and the control circuit 4 automatically controls the number of turns connected into the circuit in the secondary winding 2 according to the magnitude relation.
As shown in fig. 1 to 3, in the embodiment of the present application, the secondary winding 2 includes a plurality of winding segments arranged in parallel, two ends of each winding segment are connected to the control circuit 4, and the control circuit 4 controls the number of the winding segments connected to the circuit in the secondary winding 2 according to the detection of the current of the secondary winding 2. A plurality of winding sections can be arranged in the secondary winding 2, and the control circuit 4 controls the number of the winding groups connected into the circuit, so that the number of turns in the secondary winding 2 is adjusted to adapt to different current conditions.
As shown in fig. 1 to 3, in the embodiment of the present application, the control circuit 4 includes: the winding sections and the switches are connected in series in a one-to-one correspondence mode and are connected with the control circuit 4 through the corresponding switches, and the control circuit 4 controls the on-off of the switches to control the corresponding winding sections to be connected into the circuit or disconnected from the circuit.
In the embodiment of the present application, a switch may be disposed in each winding segment, the switch connects the winding segment and the control circuit 4, and the control circuit 4 controls the on/off of the switch, so as to connect or disconnect the corresponding winding segment to or from the circuit.
As shown in fig. 1 to 3, in the embodiment of the present application, the winding segment includes: a first winding segment 5, a second winding segment 6, a third winding segment 7 and a fourth winding segment 8, the control circuit 4 comprising: a first winding segment 5, a second winding segment 6, a third winding segment 7, a fourth winding segment 8, a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6 and a switch K7, wherein a first end of the first winding segment 5 is connected to a first end of a detection device 9 through a switch S1, a second end of the first winding segment 5 is connected to a first end of the switch K7, a second end of the switch K7 is connected to a first end of a switch S2, a second end of the switch S2 is connected to a second end of the detection device 9, a first end of the second winding segment 6 is connected to a first end of the switch K7 through the K1, a second end of the second winding segment 6 is connected to a first end of the switch K6, a second end of the switch K6 is connected to a first end of the switch S2, a first end of the third winding segment 7 is connected to a second end of the switch K6 through the switch K2, and a second end of the third winding segment 5 is connected to the switch K5, a second terminal of the switch K5 is connected to the first terminal of the switch S2, a first terminal of the fourth winding segment 8 is connected to the first terminal of the switch K5 through the switch K3, a second terminal of the fourth winding segment 8 is connected to the first terminal of the switch K4, and a second terminal of the switch K4 is connected to the first terminal of the switch S2.
In the embodiment of the present application, specifically, the switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6, and the switch K7 are configured in the control circuit 4, and the winding segments include: the first winding segment 5, the second winding segment 6, the third winding segment 7 and the fourth winding segment 8 are connected into a circuit through the on-off matching of the switches, so that the number of turns in the secondary winding 2 is adjusted to adapt to different current conditions.
As shown in fig. 1 to 3, in the embodiment of the present application, the control circuit 4 includes: the relay-based power supply comprises a current-voltage conversion circuit 10, an AD conversion circuit 11, a processor 12, a relay drive circuit 13 and a relay 14, wherein the AD conversion circuit 11 is respectively connected with the current-voltage conversion circuit 10 and the processor 12, the relay drive circuit 13 is respectively connected with the processor 12 and the relay 14, and the relay 14 is respectively connected with a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6 and a switch K7.
In the embodiment of the application, the current-voltage conversion circuit 10 conditions the current signal generated by the secondary winding 2 in the current transformer 20 into the voltage signal meeting the requirement of the AD conversion circuit 11, the AD conversion circuit 11 converts the voltage signal conditioned by the current-voltage conversion circuit 10 into a digital signal, and sends the digital signal to the processor 12, the processor 12 judges the ratio of the current transformer 20 to work according to the acquired digital signal, and outputs the signal to the relay driving circuit 13, and the relay driving circuit 13 drives the relay 14 to close or open any one or more of the switches K1-K7, so as to realize the access of one or more winding segments in different secondary windings 2, and achieve the purpose of changing the ratio of the current transformer 20.
According to the self-adaptive variable-range current transformer, the number of turns of the secondary winding connected into a circuit can be automatically adjusted according to the current detection value of the secondary winding, so that the measurement range is changed, the problem that the measurement precision of the current transformer is reduced when a circuit is in a low-load operation state is solved, and the adaptability of the current transformer is improved; the invention fills the market gap and has great market application value.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (5)
1. An adaptive variable range current transformer, comprising:
a primary winding for connecting to a primary power system; the primary winding is connected with the primary power system;
a secondary winding for connecting a secondary power system; the secondary winding is connected with the secondary power system;
the current transformer iron core is used for connecting the primary winding and the secondary winding; the primary winding and the secondary winding are respectively wound on the current transformer iron core and are in coupling connection through the current transformer iron core;
the control circuit is used for detecting the current of the secondary winding and controlling the turn number of the secondary winding access circuit; the control circuit is connected with the secondary winding.
2. The adaptive variable range current transformer of claim 1, wherein said secondary winding comprises a plurality of winding segments disposed in parallel with each other, both ends of each of said winding segments are connected to said control circuit, and said control circuit controls the number of said winding segments connected to the circuit in said secondary winding according to the detection of the current of said secondary winding.
3. The adaptive variable range current transformer of claim 2, wherein said control circuit comprises: the winding sections and the switches are connected in series in a one-to-one correspondence mode and are connected with the control circuit through the corresponding switches, and the control circuit controls the on-off of the switches to control the corresponding winding sections to be connected into the circuit or disconnected from the circuit.
4. An adaptive variable range current transformer according to claim 2 or 3, wherein the winding section comprises: a first winding segment, a second winding segment, a third winding segment, and a fourth winding segment, the control circuit comprising: a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a switch K6 and a switch K7, wherein a first end of the first winding segment is connected to a first end of a detection device through a switch S1, a second end of the first winding segment is connected to a first end of the switch K7, a second end of the switch K7 is connected to a first end of a switch S2, a second end of the switch S2 is connected to a second end of the detection device, a first end of the second winding segment is connected to a first end of the switch K7 through the K1, a second end of the second winding segment is connected to a first end of the switch K6, a second end of the switch K6 is connected to a first end of the switch S2, a first end of the third winding segment is connected to a first end of the switch K6 through the K2, a second end of the third winding segment is connected to a first end of the switch K5, a second end of the switch K5 is connected to a second end of the switch S2, a first end of the fourth winding segment is connected to a first end of the switch K5 through the switch K3, a second end of the fourth winding segment is connected to a first end of the switch K4, and a second end of the switch K4 is connected to a first end of the switch S2.
5. The adaptive variable range current transformer of claim 4, wherein said control circuit comprises: the device comprises a current-voltage conversion circuit, an AD conversion circuit, a processor, a relay drive circuit and a relay, wherein the AD conversion circuit is respectively connected with the current-voltage conversion circuit and the processor, the relay drive circuit is respectively connected with the processor and the relay, and the relay is respectively connected with the switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6 and the switch K7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010912999.2A CN112164559A (en) | 2020-09-03 | 2020-09-03 | Self-adaptive variable-range current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010912999.2A CN112164559A (en) | 2020-09-03 | 2020-09-03 | Self-adaptive variable-range current transformer |
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| Publication Number | Publication Date |
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| CN112164559A true CN112164559A (en) | 2021-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010912999.2A Pending CN112164559A (en) | 2020-09-03 | 2020-09-03 | Self-adaptive variable-range current transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113707441A (en) * | 2021-08-13 | 2021-11-26 | 国网河北省电力有限公司检修分公司 | Adjustable transformation ratio CT wiring terminal capable of preventing open circuit in uninterrupted state |
| CN114121460A (en) * | 2022-01-24 | 2022-03-01 | 浙江华采科技有限公司 | Digital current transformer adopting low-permeability magnetic powder core |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2641788Y (en) * | 2002-12-12 | 2004-09-15 | 杨大成 | Voltage mutual inductor for large size power transformer experiment |
| CN202275709U (en) * | 2011-08-19 | 2012-06-13 | 杨跃龙 | Secondary tapped multi-range high-precision current transformer capable of changing ratio of transformation in real time |
| CN106291048A (en) * | 2016-07-28 | 2017-01-04 | 国家电网公司 | A kind of current boost device, current transformer and current test method |
| CN209198521U (en) * | 2018-10-17 | 2019-08-02 | 南方电网科学研究院有限责任公司 | Zero flux high-precise zero-sequence current transformer |
| CN111366764A (en) * | 2018-12-25 | 2020-07-03 | 国网江西省电力有限公司电力科学研究院 | Wide-range current transducer |
-
2020
- 2020-09-03 CN CN202010912999.2A patent/CN112164559A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2641788Y (en) * | 2002-12-12 | 2004-09-15 | 杨大成 | Voltage mutual inductor for large size power transformer experiment |
| CN202275709U (en) * | 2011-08-19 | 2012-06-13 | 杨跃龙 | Secondary tapped multi-range high-precision current transformer capable of changing ratio of transformation in real time |
| CN106291048A (en) * | 2016-07-28 | 2017-01-04 | 国家电网公司 | A kind of current boost device, current transformer and current test method |
| CN209198521U (en) * | 2018-10-17 | 2019-08-02 | 南方电网科学研究院有限责任公司 | Zero flux high-precise zero-sequence current transformer |
| CN111366764A (en) * | 2018-12-25 | 2020-07-03 | 国网江西省电力有限公司电力科学研究院 | Wide-range current transducer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113707441A (en) * | 2021-08-13 | 2021-11-26 | 国网河北省电力有限公司检修分公司 | Adjustable transformation ratio CT wiring terminal capable of preventing open circuit in uninterrupted state |
| CN114121460A (en) * | 2022-01-24 | 2022-03-01 | 浙江华采科技有限公司 | Digital current transformer adopting low-permeability magnetic powder core |
| CN114121460B (en) * | 2022-01-24 | 2023-02-28 | 浙江华采科技有限公司 | Digital current transformer adopting low-permeability magnetic powder core |
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