CN105679507A - Instantaneous adjustable electric reactance current limiting reactor - Google Patents
Instantaneous adjustable electric reactance current limiting reactor Download PDFInfo
- Publication number
- CN105679507A CN105679507A CN201610192465.0A CN201610192465A CN105679507A CN 105679507 A CN105679507 A CN 105679507A CN 201610192465 A CN201610192465 A CN 201610192465A CN 105679507 A CN105679507 A CN 105679507A
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- China
- Prior art keywords
- iron core
- current
- air gap
- dynamic iron
- limiting reactor
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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
- H01F27/24—Magnetic cores
-
- 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
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/021—Current limitation using saturable reactors
Abstract
The invention discloses an instantaneous adjustable electric reactance current limiting reactor. The instantaneous adjustable electric reactance current limiting reactor comprises a static iron core, a movable iron core and a winding coil, wherein the winding coil is arranged on the static iron core, an air gap is formed in the static iron core, and when a corresponding power system is short-circuited, the movable iron core can be inserted into the air gap. When the power system is operated, the movable iron core is separated from the air gap of the static iron core and is maintained at the separation state. When the power system has a malfunction, the current increases sharply, after detecting a current signal, a system protection device transmits the current signal to a drive mechanism, the drive mechanism drives the movable iron core to move towards the air gap direction of the static iron core, and the movable iron core gradually enters the air gap. As the air gap is gradually narrowed, an electric reactance value of the electric reactor increases rapidly, so that a current limiting purpose is achieved, and rapidness in response is realized.
Description
Technical field
The present invention relates to reactor technical field, be specifically related to the current-limiting reactor of a kind of instantaneous regulative reactance.
Background technology
Along with developing rapidly of power system, the interconnection between the load in single-machine capacity, station capacity, substation capacity, city and the center of industry and the increase of load density, power system, cause that the short circuit current size in power system is continuously increased. At present, short circuit current excessive even exceed standard oneself become restriction power network development key factor. Changing switch is one of means solving short circuit current excessive problem, but the transformer station that short circuit current exceeds standard is generally load-center substation, and the number of switches that need to change is numerous, and major part primary equipment and grounded screen etc. also need to change. Although changing the switch operation characteristic on electrical network without impact, but adopting the investment of this means big, long in time limit, making electrical network load-center substation be chronically at non-normal operation mode. Now, commonly used both at home and abroad way is the growth of limiting short-circuit current. Limiting short-circuit current can be set about from electric network composition, the method for operation and current limiter. Current limiter (short circuit current limiter, current-limiting reactor etc.) is the focus of domestic and international power system research, substantially can be divided into four classes by its technology: (1) is traditional, utilize current-limiting reactor limiting short-circuit current. This method and technology is ripe, has extensive application, but its running wastage is big, thereby increases and it is possible to can reduce the stability of operation of power networks in power system. (2) power electronics type, utilizes electronic power switch fast shut-off or transfer short circuit current, and its current limiting element is still reactor. The parameter request that the subject matter that this method exists is power electronic devices is high, and running wastage is big. (3) special material type, adopts such as superconductor and the material etc. with positive temperature coefficient (PTC), as the impedance of limiting short-circuit current. When electrical network is properly functioning, current-limiting impedance is almost nil. The fault once be short-circuited, short circuit current exceedes critical current, presents significant current-limiting impedance. This short circuit current limiter is because being limited to the development of new material, how under test and with high costs. (4) comprehensive, combine application by the electric current restriction technologies of several types. For middle high-pressure power transmission and transformation and distribution system, traditional current-limiting reactor technology is the short-circuit current limiting measure most possibly adopted present stage.
The essence of current-limiting reactor is by increasing system impedance, reduces the tightness degree of electrical network, thus reducing the short circuit current of some branch of substation bus bar. Current-limiting reactor was once widely used at middle low-pressure system, and along with the raising of switch manufacture level, the current-limiting reactor of middle-and-high voltage system makes consumption gradually decrease. But current-limiting reactor can be effectively reduced the short circuit current level of system, reduce the short circuit current tolerance level of equipment, have the economic benefit of highly significant, still obtain substantial amounts of application in many occasions. The Typical Disposition mode of current-limiting reactor mainly has: bus contact mode, line scan pickup coil side access way, is serially connected with transformer branch and is installed at transformer neutral point. Current-limiting reactor is divided into classical tandem reactor and adjustable series reactor by its Control Cooling. Classical tandem reactor is non-adjustable reactor; its advantage is that the method for operation is simple, safe and reliable; but reactive loss and active loss can be increased greatly, reduce the stability of power system sometimes, and the distance protection scheme on existing line need to be modified. And adjustable series reactor is only small on the impact of electrical network when system is properly functioning, again can comparatively quick limiting short-circuit current when system is short-circuited. Adjustable series reactor can be divided into two kinds by technology path: turn adjusting controllable reactor and direct current magnetism-assisting adjust permeability formula controlled reactor. Two kinds of adjustable series reactors solve the shortcoming that classical tandem reactor running wastage is big, induction reactance value is fixing all in varying degrees, and the stability influence of power system is less. But the induction reactance adjustment of turn adjusting controllable reactor reaches the action time of predetermined value up to the several seconds, and the adjustment time of direct current magnetism-assisting tune permeability formula controlled reactor is shorter, but also reaches about 100ms, even longer. Now, the power system of the accident that is short-circuited, especially straight-flow system, it may occur that major accident.
Summary of the invention
It is an object of the invention to provide the current-limiting reactor of a kind of instantaneous regulative reactance that can quickly respond when power system is short-circuited.
In order to realize object above, in the present invention, the technical scheme of current-limiting reactor is as follows: the current-limiting reactor of instantaneous regulative reactance, including static iron core, dynamic iron core and winding coil, winding coil is arranged on static iron core, described static iron core is provided with air gap, and described dynamic iron core is inserted in described air gap when corresponding power system is short-circuited.
The closing in shape that described air gap is opening to be tapered into along the direction of insertion of described dynamic iron core.
Described air gap includes dovetail groove, and the notch of described dovetail groove tapers into along the direction of insertion of described dynamic iron core.
Described air gap also includes rectangular channel, and the groove side wall transition that the groove sidewall of described rectangular channel is corresponding with dovetail groove connects.
Described dovetail groove is located close to the side of described dynamic iron core, and described rectangular channel is located remotely from the side of described dynamic iron core.
The current-limiting reactor of described instantaneous regulative reactance also includes for driving described dynamic iron core to be inserted into the electromagnetic repulsion force mechanism in described air gap when described power system is short-circuited.
Described dynamic iron core includes the inserting paragraph for being inserted in described air gap under the driving of corresponding driving mechanism and the linkage section for being connected with described driving mechanism, and described inserting paragraph gradually tapers up along the direction of insertion of described dynamic iron core.
The inserting paragraph of described dynamic iron core is wedge shaped, and the angle of inclination of the wedge surface of described dynamic iron core is adaptive with the opening angle of air gap.
The rectangular shape of described static iron core, the direction of insertion being inserted in described air gap of described dynamic iron core is along the sidewall direction being perpendicular to described static iron core.
Beneficial effects of the present invention: during Operation of Electric Systems, the dynamic iron core in the present invention moves to the direction away from static iron core under the drive of corresponding driving mechanism, departs from the position of the air gap of static iron core and keeps this state. Now, current-limiting reactor of the present invention is equivalent to common current-limiting reactor. When straight-flow system breaks down; current spikes raises; system protection device detects after current signal and by signal to corresponding driving mechanism, and driving mechanism starts action and drives dynamic iron core to move to the air gap direction of static iron core, and dynamic iron core progresses in air gap. Along with being gradually reduced of air gap, the reactance value of reactor quickly raises, and response time significantly foreshortens to 3-5ms, thus realizing good current limitation effect. Current-limiting reactor of the present invention adopts the form that dynamic and static iron core combines, and namely meets the requirement of power system fault current limiting, ensures again the stability of power system preferably.
Accompanying drawing explanation
Fig. 1 is the structural representation of the current-limiting reactor of the instantaneous regulative reactance of the present invention;
Fig. 2 is the structural representation of the static iron core in Fig. 1.
Detailed description of the invention
The embodiment of the current-limiting reactor of the instantaneous regulative reactance of the present invention: as shown in Figure 1-2, current-limiting reactor, including framework 5, static iron core 1, dynamic iron core 3 and winding coil 2. Winding coil 2 is arranged on static iron core 1, and static iron core 1 is arranged on framework 5. The rectangular shape of static iron core 1, static iron core 1 is surrounded by long section 11 and short section 12, and winding coil 2 is arranged in the long section 11 in left side. It is positioned on short section 12 of rear side and offers the air gap 13 that front and back are through. The closing in shape that air gap 13 tapers into along the direction of insertion of dynamic iron core 3 in opening. Air gap includes dovetail groove 14, rectangular channel 15, and the notch of dovetail groove 14 tapers into along the direction of insertion of dynamic iron core 3, namely its width of rebate tapers into, and the cross section of dovetail groove 14 is isosceles trapezoid. The groove side wall transition that the groove sidewall of rectangular channel 15 is corresponding with dovetail groove 14 connects. Dovetail groove 14 is near the side of dynamic iron core, namely is positioned at rear side, and rectangular channel 15 is located remotely from the side of dynamic iron core. The shared length in the longitudinal direction of rectangular channel 15 is less than dovetail groove shared length in the longitudinal direction.
Dynamic iron core 3 includes for being inserted into the inserting paragraph in air gap and the linkage section for being connected with driving mechanism under the driving of corresponding driving mechanism along the longitudinal direction, and inserting paragraph gradually tapers up along the direction of insertion of dynamic iron core. The direction of insertion being inserted in air gap of dynamic iron core is along the sidewall direction being perpendicular to static iron core, and in the present embodiment, the direction of insertion of dynamic iron core 3 is perpendicular to the sidewall of short section 12 that offers air gap place. The inserting paragraph of dynamic iron core 3 is wedge shaped, and the angle of inclination of the wedge surface of dynamic iron core 3 is adaptive with the opening angle of air gap, and in the present embodiment, two, the left and right wedge surface of dynamic iron core 3 is adaptive with the cell wall of the left and right sides of dovetail groove 14, and corresponding angle of inclination is consistent. Current-limiting reactor also includes the electromagnetic repulsion force mechanism 4 for driving dynamic iron core to be inserted in air gap when power system is short-circuited. Electromagnetic repulsion force mechanism 4 includes two repulsion coils be arrangeding in parallel and the repulsion dish between two repulsion coils, and the linkage section of dynamic iron core 3 is connected on repulsion dish. When one of them repulsion coil obtain electric after, repulsion dish can promote dynamic iron core quickly to be moved towards the direction of another repulsion coil by this repulsion coil, otherwise, another repulsion coil obtains electric, and dynamic iron core produces reciprocal motion. The principle of electromagnetic repulsion force mechanism is prior art.
As optimizing further, in the long section in the left side of static iron core namely winding coil position air gap is set so that the scope that reactance changes when power system is short-circuited is bigger.
During Operation of Electric Systems, the dynamic iron core 3 of present invention rearward movement under the drive of electromagnetic repulsion force mechanism 4, depart from the gap position of static iron core 1 and keep. Now, the present invention is equivalent to common current-limiting reactor. When straight-flow system breaks down, current spikes raises, and system protection device detects after current signal and by signal to electromagnetic repulsion force mechanism, and electromagnetic repulsion force mechanism 4 starts action and drives dynamic iron core 3 to travel forward, and the inserting paragraph of dynamic iron core 3 progresses in air gap. Along with being gradually reduced of air gap, the reactance value of reactor quickly raises, and response time significantly foreshortens to 3-5ms, thus realizing good current limitation effect. Current-limiting reactor of the present invention adopts the form that dynamic and static iron core combines, and namely meets the requirement of power system fault current limiting, ensures again the stability of power system preferably. Current-limiting reactor simple in construction, running wastage is less, and induction reactance transient state is adjustable.
In the present embodiment, the opening shape of air gap, adopt the structure that dovetail groove is combined with rectangular channel, mainly consider easy to process. In other embodiments, air gap can be configured as the version of only one dovetail groove, or the version of only one rectangular channel, or adopt the version of arc groove, certainly, the shape of dynamic iron core also wants adaptive change, with the shape adaptation of air gap, such as when air gap is rectangular channel, the inserting paragraph of dynamic iron core can be just a quadrangular shape or cylindric. In other embodiments, dynamic iron core also can be inserted in air gap along the vertical direction, and air gap is the closing in shape that opening from top to bottom tapers into.
In other embodiments, except above-mentioned electromagnetic repulsion force mechanism, it is also possible to adopt other kinds of driving mechanism, it is necessary to meet the requirement that can quickly respond, such as dynamic iron core can be fitted into row cutting by servomotor or motor and leading screw, it is possible to employing electric pushrod. Electromagnetic repulsion force mechanism can be a part for current-limiting reactor, when product manufacturing, is assembled together. Electromagnetic repulsion force mechanism may not be a part for current-limiting reactor, when in use with dynamic iron core with the use of.
In other embodiments, static iron core may be used without annular iron core.
Claims (9)
1. the current-limiting reactor of instantaneous regulative reactance, it is characterized in that: include static iron core, dynamic iron core and winding coil, winding coil is arranged on static iron core, and described static iron core is provided with air gap, and described dynamic iron core is inserted in described air gap when corresponding power system is short-circuited.
2. the current-limiting reactor of instantaneous regulative reactance according to claim 1, it is characterised in that: the closing in shape that described air gap is opening to be tapered into along the direction of insertion of described dynamic iron core.
3. the current-limiting reactor of instantaneous regulative reactance according to claim 2, it is characterised in that: described air gap includes dovetail groove, and the notch of described dovetail groove tapers into along the direction of insertion of described dynamic iron core.
4. the current-limiting reactor of instantaneous regulative reactance according to claim 3, it is characterised in that: described air gap also includes rectangular channel, and the groove side wall transition that the groove sidewall of described rectangular channel is corresponding with dovetail groove connects.
5. the current-limiting reactor of instantaneous regulative reactance according to claim 4, it is characterised in that: described dovetail groove is located close to the side of described dynamic iron core, and described rectangular channel is located remotely from the side of described dynamic iron core.
6. the current-limiting reactor of instantaneous regulative reactance according to claim 1, it is characterised in that: the current-limiting reactor of described instantaneous regulative reactance also includes for driving described dynamic iron core to be inserted into the electromagnetic repulsion force mechanism in described air gap when described power system is short-circuited.
7. the current-limiting reactor of the instantaneous regulative reactance according to any one of claim 2 to 5, it is characterized in that: described dynamic iron core includes the inserting paragraph for being inserted in described air gap under the driving of corresponding driving mechanism and the linkage section for being connected with described driving mechanism, and described inserting paragraph gradually tapers up along the direction of insertion of described dynamic iron core.
8. the current-limiting reactor of instantaneous regulative reactance according to claim 7, it is characterised in that: the inserting paragraph of described dynamic iron core is wedge shaped, and the angle of inclination of the wedge surface of described dynamic iron core is adaptive with the opening angle of air gap.
9. the current-limiting reactor of the instantaneous regulative reactance according to any one of claim 1 to 5, it is characterised in that: the rectangular shape of described static iron core, the direction of insertion being inserted in described air gap of described dynamic iron core is along the sidewall direction being perpendicular to described static iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192465.0A CN105679507A (en) | 2016-03-30 | 2016-03-30 | Instantaneous adjustable electric reactance current limiting reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192465.0A CN105679507A (en) | 2016-03-30 | 2016-03-30 | Instantaneous adjustable electric reactance current limiting reactor |
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| CN105679507A true CN105679507A (en) | 2016-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610192465.0A Pending CN105679507A (en) | 2016-03-30 | 2016-03-30 | Instantaneous adjustable electric reactance current limiting reactor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571214A (en) * | 2016-10-27 | 2017-04-19 | 国家电网公司 | Current limiting reactor with instantaneous adjustable reactance |
| CN106783037A (en) * | 2017-01-21 | 2017-05-31 | 陆川县长隆电子有限公司 | A kind of intelligent inductor |
| CN106910596A (en) * | 2017-02-28 | 2017-06-30 | 南通壹选工业设计有限公司 | One kind prevents oversaturated current transformer |
| CN106976408A (en) * | 2017-05-15 | 2017-07-25 | 重庆国翰能源发展有限公司 | A kind of charging pile that can share charging parallel shares box |
| CN108155001A (en) * | 2018-01-16 | 2018-06-12 | 大连理工大学 | A kind of air gap Quick regulation type controllable current limiting reactor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5642318A (en) * | 1979-09-12 | 1981-04-20 | Nissin Electric Co Ltd | Movable-core type reactor |
| CN101771270A (en) * | 2008-12-31 | 2010-07-07 | Ls产电株式会社 | Fault current limiter |
| CN203351390U (en) * | 2013-07-05 | 2013-12-18 | 武汉伏特克电气工程有限公司 | Mechanical-adjusting adjustable reactor |
| CN203910418U (en) * | 2014-05-13 | 2014-10-29 | 江苏省电力公司南京供电公司 | Adjustable-power type electric reactor |
-
2016
- 2016-03-30 CN CN201610192465.0A patent/CN105679507A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5642318A (en) * | 1979-09-12 | 1981-04-20 | Nissin Electric Co Ltd | Movable-core type reactor |
| CN101771270A (en) * | 2008-12-31 | 2010-07-07 | Ls产电株式会社 | Fault current limiter |
| CN203351390U (en) * | 2013-07-05 | 2013-12-18 | 武汉伏特克电气工程有限公司 | Mechanical-adjusting adjustable reactor |
| CN203910418U (en) * | 2014-05-13 | 2014-10-29 | 江苏省电力公司南京供电公司 | Adjustable-power type electric reactor |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106571214A (en) * | 2016-10-27 | 2017-04-19 | 国家电网公司 | Current limiting reactor with instantaneous adjustable reactance |
| CN106783037A (en) * | 2017-01-21 | 2017-05-31 | 陆川县长隆电子有限公司 | A kind of intelligent inductor |
| CN106910596A (en) * | 2017-02-28 | 2017-06-30 | 南通壹选工业设计有限公司 | One kind prevents oversaturated current transformer |
| CN106976408A (en) * | 2017-05-15 | 2017-07-25 | 重庆国翰能源发展有限公司 | A kind of charging pile that can share charging parallel shares box |
| CN106976408B (en) * | 2017-05-15 | 2023-04-07 | 重庆国翰能源发展有限公司 | Charging pile sharing box capable of achieving parallel sharing charging |
| CN108155001A (en) * | 2018-01-16 | 2018-06-12 | 大连理工大学 | A kind of air gap Quick regulation type controllable current limiting reactor |
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Application publication date: 20160615 |
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