CN102290226A - Current transformer - Google Patents
Current transformer Download PDFInfo
- Publication number
- CN102290226A CN102290226A CN 201110109259 CN201110109259A CN102290226A CN 102290226 A CN102290226 A CN 102290226A CN 201110109259 CN201110109259 CN 201110109259 CN 201110109259 A CN201110109259 A CN 201110109259A CN 102290226 A CN102290226 A CN 102290226A
- Authority
- CN
- China
- Prior art keywords
- current transformer
- iron core
- current
- core column
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to the field of power transmission and transformation of a power system, in particular to a current transformer. The current transformer comprises a current transformer iron core. The current transformer iron core is provided with three core limbs. Both ends of the three core limbs are provided with iron yokes to form magnetic flux loops. The core limb in the middle is provided with a primary coil L1 and a secondary coil L2. The core limb at one side is provided with a coil L3. The sectional area of the core limb at the other side is equal to or less than that of the core limb in the middle. Both ends of the coil L3 are in short connection. When a primary side current of the current transformer is a normal load current, a secondary side current of the current transformer is changed with the primary side current proportionally. When the primary side current of the current transformer is higher than a designed value, the secondary side current of the current transformer is rapidly reduced.
Description
Technical field
The present invention relates to electric power system and send the power transformation field, particularly a kind of current transformer.
Background technology
Along with the continuous development of electric power system, the continuous rising of generate output, the electric power system short circuit current that causes that is short-circuited is very big.The be short-circuited short circuit current that causes of electric power system is very big to the harm of electric power system.Reduce short circuit current, reduce the extent of damage of power equipment when short circuit, improve the stability of electric power system.The method and apparatus of Recent study limiting short-circuit current (also claiming demand limiter) becomes heat subject.
" a kind of three-phase current restraint device and the method " of the patent No. 2011100018162 is one of achievements in research of this respect.This invention utilizes the saturation characteristic of current transformer and the saturation characteristic of reactor to come limiting short-circuit current.This invention utilizes the current transformer of universal method design can realize basic function, still, if further improve the performance of current limiting device, will invent the current transformer that meets current limiting device special requirement, property.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, and invents a kind of meeting the current transformer of " a kind of three-phase current restraint device and method " special requirement, property.
For achieving the above object, the present invention adopts following technical scheme:
A kind of current transformer, it comprises:
A current transformer core; Described current transformer core has three iron core column, and three iron core column two ends have the iron yoke piece to become flux circuit; Middle iron core column is provided with primary winding L1, secondary coil L2, and a side iron core column is provided with coil L3; The sectional area of iron core column in the middle of the sectional area of opposite side iron core column is equal to or less than; Coil L3 shorted on both ends.
A kind of current transformer, it comprises:
A current transformer core; Described current transformer core has three iron core column, and three iron core column two ends have the iron yoke piece to become flux circuit; Middle iron core column is provided with primary winding L1; One side iron core column is provided with secondary coil L2, the sectional area of iron core column in the middle of the sectional area of this iron core column is equal to or less than; The opposite side iron core column is provided with coil L3; Coil L3 shorted on both ends.
The invention has the beneficial effects as follows: when the current transformer primary side current was the normal duty electric current, Current Transformer Secondary side electric current changed along with the variation of primary side current pro rata; When the current transformer primary side current surpassed design load, Current Transformer Secondary side electric current reduced fast.
Description of drawings
Fig. 1 represents a kind of current transformer structure;
Fig. 2 represents another kind of current transformer structure;
Wherein, 1. a terminal I, 2. a terminal II, 3. secondary terminal I, 4. secondary terminal II, 5. iron core column I, 6. iron core column II, 7. iron core column III.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
Embodiment 1:
The current transformer structure as shown in Figure 1.When the current transformer primary side current was the normal duty electric current, a current transformer core was unsaturated.Iron core column III7 has coil L3; Coil L3 shorted on both ends.Exchange flux can not flow through iron core column III7, and the magnetic flux that primary winding L1 produces circulates between iron core column I5 and iron core column II6, and iron core column I5 has secondary coil L2, and Current Transformer Secondary side electric current changes along with the variation of primary side current pro rata; When current transformer primary side current instantaneous value surpassed design load, because the sectional area of iron core column II6 is equal to or less than the sectional area of iron core column I5, iron core column II6 entered saturation condition; The magnetic flux that primary winding L1 produces no longer enters iron core column II6, but entering iron core column III7, iron core column III7 has coil L3, coil L3 shorted on both ends, the primary side current instantaneous value surpasses the part of design load by coil L3 short circuit, and the electric current of the secondary coil L2 of iron core column 5I reduces fast.
Embodiment 2:
The current transformer structure as shown in Figure 2.When the current transformer primary side current was the normal duty electric current, a current transformer core was unsaturated.Iron core column III7 has coil L3; Coil L3 shorted on both ends.Exchange flux can not flow through iron core column III7, and the magnetic flux that primary winding L1 produces circulates between iron core column I5 and iron core column II6, and iron core column II6 has secondary coil L2, and Current Transformer Secondary side electric current changes along with the variation of primary side current pro rata; When current transformer primary side current instantaneous value surpassed design load, because the sectional area of iron core column II6 is equal to or less than the sectional area of iron core column I5, iron core column II6 entered saturation condition; The magnetic flux that primary winding L1 produces no longer enters iron core column II6, but entering iron core column III7, iron core column III7 has coil L3, coil L3 shorted on both ends, the primary side current instantaneous value surpasses the part of design load by coil L3 short circuit, and the electric current of the secondary coil L2 of iron core column II6 reduces fast.
Current transformer of the present invention can manufacture and design with prior art, can realize fully.Broad prospect of application is arranged.
Claims (2)
1. current transformer is characterized in that it comprises:
A current transformer core; Described current transformer core has three iron core column, and three iron core column two ends have the iron yoke piece to become flux circuit; Middle iron core column is provided with primary winding L1, secondary coil L2, and a side iron core column is provided with coil L3; The sectional area of iron core column in the middle of the sectional area of opposite side iron core column is equal to or less than; Coil L3 shorted on both ends.
2. current transformer is characterized in that it comprises:
A current transformer core; Described current transformer core has three iron core column, and three iron core column two ends have the iron yoke piece to become flux circuit; Middle iron core column is provided with primary winding L1; One side iron core column is provided with secondary coil L2, the sectional area of iron core column in the middle of the sectional area of this iron core column is equal to or less than; The opposite side iron core column is provided with coil L3; , coil L3 shorted on both ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110109259 CN102290226A (en) | 2011-04-22 | 2011-04-22 | Current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110109259 CN102290226A (en) | 2011-04-22 | 2011-04-22 | Current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102290226A true CN102290226A (en) | 2011-12-21 |
Family
ID=45336547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110109259 Pending CN102290226A (en) | 2011-04-22 | 2011-04-22 | Current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102290226A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653336A (en) * | 2015-10-29 | 2017-05-10 | 中国电力科学研究院 | Method of manufacturing current transformer with function of simplifying error test |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0062850A1 (en) * | 1981-04-14 | 1982-10-20 | Siemens Aktiengesellschaft | Iron core choke coil with an air gap for starting a single or polyphase squirrel cage asynchronous motor with a low starting torque |
| CN1251939A (en) * | 1998-10-20 | 2000-05-03 | 朱栢 | Superconducting current limiter with damping component |
| CN1472755A (en) * | 2002-07-30 | 2004-02-04 | 致伸科技股份有限公司 | Coil frame of transformer |
-
2011
- 2011-04-22 CN CN 201110109259 patent/CN102290226A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0062850A1 (en) * | 1981-04-14 | 1982-10-20 | Siemens Aktiengesellschaft | Iron core choke coil with an air gap for starting a single or polyphase squirrel cage asynchronous motor with a low starting torque |
| CN1251939A (en) * | 1998-10-20 | 2000-05-03 | 朱栢 | Superconducting current limiter with damping component |
| CN1472755A (en) * | 2002-07-30 | 2004-02-04 | 致伸科技股份有限公司 | Coil frame of transformer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653336A (en) * | 2015-10-29 | 2017-05-10 | 中国电力科学研究院 | Method of manufacturing current transformer with function of simplifying error test |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101521373B (en) | Device and method for limiting short-circuit current | |
| CN102074331B (en) | Magnetic saturation reactor | |
| CN204792368U (en) | Novel power transformer | |
| CN102184765B (en) | Saturable reactor | |
| CN203931733U (en) | A kind of magnetic core, integrated magnetic component, active clamp positive and negative excitation circuit and Switching Power Supply | |
| CN104505239A (en) | Mixed magnetic biasing magnetic saturation controllable electric reactor | |
| EP3136405B1 (en) | Coupling inductor and power converter | |
| CN102306533B (en) | High-power adjustable inductor | |
| CN102290226A (en) | Current transformer | |
| CN203277050U (en) | Demagnetization coil structure applied to three-main-post parallel transformer | |
| CN204010892U (en) | A kind of common mode inductance | |
| CN102881412A (en) | Energy-generation transformer | |
| CN102360880A (en) | Ferroresonance-preventing self-power supply device of electronic voltage transformer | |
| CN201465737U (en) | Coil structure in transformer | |
| CN206921630U (en) | Permanent magnet bias inductor | |
| CN102184766B (en) | Low-noise saturable reactor | |
| CN203192576U (en) | Modified dry type transformer low-voltage copper bar | |
| CN219979295U (en) | Combined conjugated reactor | |
| CN201465738U (en) | Structure between high tension coil and low tension coil in transformer | |
| CN101989488A (en) | Structure between high-tension coil and low-tension coil in transformer | |
| CN203080014U (en) | Magnetic core heat treatment and magnetization power supply system | |
| CN203103955U (en) | Reactor being capable of avoiding repeated harmonic waves | |
| JP3153280U (en) | Transformer for wound core type electric welding machine | |
| CN205789445U (en) | A kind of adjustable miniature transformer | |
| JP5605953B2 (en) | Electric welding machine transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20111221 |