CN102097794A - Device and method for limiting short circuit current by utilizing saturation characteristics of transformer - Google Patents
Device and method for limiting short circuit current by utilizing saturation characteristics of transformer Download PDFInfo
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- CN102097794A CN102097794A CN2011100409537A CN201110040953A CN102097794A CN 102097794 A CN102097794 A CN 102097794A CN 2011100409537 A CN2011100409537 A CN 2011100409537A CN 201110040953 A CN201110040953 A CN 201110040953A CN 102097794 A CN102097794 A CN 102097794A
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Abstract
The invention discloses a device and a method for limiting a short circuit current by utilizing saturation characteristics of a transformer. A valve circuit connected in parallel with the two ends of a capacitor is automatically short-circuited at short circuiting without a special short circuit current detection device, so the device has a simple structure, is convenient to run and maintain and ensures low running loss. The device comprises the transformer, wherein the transformer consists of at least one primary coil L1 and at least one secondary coil L2; one end of the primary coil L1 is connected in series with a reactor L3, and the other end of the primary coil L1 is an input terminal; the other end of the reactor L3 is an output terminal; the secondary coil L2 is connected in parallel with the capacitor C; and a transformer core has the saturation characteristics.
Description
Technical field
The present invention relates to electric power system and send the power transformation technical field, particularly a kind of short-circuit current limiting device and method of utilizing the transformer saturation characteristic.
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, can 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.
Utilize the series resonance principle can constitute short circuit current limiter.When inductance coil and capacitors in series resonance, present small resistor; The short circuit current limiter that is connected in the transmission line does not influence normal transmission of electricity.When electric power system was short-circuited, control module measured short circuit current, and control is parallel to the valve thyristor conducting at capacitor two ends; Capacitor lost efficacy; The inductance coil that is connected in the transmission line provides constraints to short circuit current, reduces short circuit current.Siemens Company has made the first cover series resonance principle short circuit current limiter in the world.Units such as the China Power academy of sciences and Huadong Research Inst of Electric Power Experiment grasped core key technology, had made series resonance principle short circuit current limiter at home first in 2009.The shortcoming of this scheme is: control is parallel to the valve thyristor circuit complexity at capacitor two ends, needs many thyristors series connection withstand voltage to improve thyristor, and the operation maintenance difficulty costs an arm and a leg, running wastage is big.
Summary of the invention
Purpose of the present invention is exactly in order to address the above problem, a kind of short-circuit current limiting device and method of utilizing the transformer saturation characteristic is provided, it does not need special short circuit current checkout gear, be parallel to valve circuit automatic short circuit when short circuit takes place at capacitor two ends, simple in structure, operation maintenance is convenient, and running wastage is little.
For achieving the above object, the present invention adopts following technical scheme:
A kind of short-circuit current limiting device that utilizes the transformer saturation characteristic, it comprises:
The transformer of forming by at least one primary winding L1 and at least one secondary coil L2; Wherein primary winding L1 one end is connected with reactor L3, and the other end is an output, and the other end of reactor L3 is another output; Secondary coil L2 is then in parallel with capacitor C; Transformer core has saturation characteristic.
Transformer core was unsaturated when described electric power system normally moved, and transformer core was saturated when the short circuit current that flows through primary winding L1 reached setting value.
A kind of method of work of utilizing the short-circuit current limiting device of transformer saturation characteristic,
The short-circuit current limiting device series connection of transformer saturation characteristic is inserted transmitting loop;
When electric power system normally moved, transformer core was unsaturated; Capacitor C is by the coupling of transformer primary winding L1 and secondary coil L2, with reactor L3, the transmitting loop of connecting series connection; Little when capacitor C makes the transmitting loop impedance ratio not connect a kind of short-circuit current limiting device of transformer saturation characteristic;
When electric power system was short-circuited, short circuit current flow through primary winding L1, and transformer core was saturated when the short circuit current that flows through primary winding L1 reached setting value; The capacitive reactance of capacitor C is inoperative to transmitting loop, and reactor L3 connects with transmitting loop; Big when reactor L3 makes the transmitting loop impedance ratio not connect a kind of short-circuit current limiting device of transformer saturation characteristic; Reactor L3 limiting short-circuit current.
The invention has the beneficial effects as follows: do not need special short circuit current checkout gear, be parallel to valve circuit automatic short circuit when short circuit takes place at capacitor two ends, simple in structure, operation maintenance is convenient, and running wastage is little.When the Power System Shortcuts disappearance, a kind of short-circuit current limiting device of transformer saturation characteristic can recover operate as normal automatically.
Description of drawings
Fig. 1 represents a kind of short-circuit current limiting device structure and connected mode of transformer saturation characteristic;
Wherein, 1. input terminal, 2. lead-out terminal.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment.
Fig. 1 represents a kind of short-circuit current limiting device of transformer saturation characteristic, and it comprises: the transformer that primary winding L1 and secondary coil L2 form; Reactor L3; Capacitor C.
Wherein primary winding L1 one end is connected with reactor L3, and the other end is an input terminal 1, and the other end of reactor L3 is a lead-out terminal 2; Secondary coil L2 is in parallel with capacitor C.
A kind of short-circuit current limiting device series connection of transformer saturation characteristic inserts transmitting loop.
When electric power system normally moved, transformer core was unsaturated; Capacitor C is by the coupling of transformer primary winding L1 and secondary coil L2, with reactor L3, the transmitting loop of connecting series connection; Little when capacitor C makes the transmitting loop impedance ratio not connect a kind of short-circuit current limiting device of transformer saturation characteristic; Generally speaking, after the no-load voltage ratio of the capacitive reactance amplitude of capacitor C by transformer primary winding L1 and secondary coil L2, equal reactor L3 reactance value, a kind of series impedance of short-circuit current limiting device of transformer saturation characteristic is close to zero.After the no-load voltage ratio of capacitive reactance amplitude that also can capacitor C by transformer primary winding L1 and secondary coil L2, greater than reactor L3 reactance value, the series impedance that makes a kind of short-circuit current limiting device of transformer saturation characteristic is a capacitive, as the transmission line series compensation capacitor.
When electric power system was short-circuited, short circuit current flow through primary winding L1, and transformer core was saturated when the short circuit current that flows through primary winding L1 reached setting value; The capacitive reactance of capacitor C is inoperative to transmitting loop, and reactor L3 connects with transmitting loop; Big when reactor L3 makes the transmitting loop impedance ratio not connect a kind of short-circuit current limiting device of transformer saturation characteristic; Reactor L3 limiting short-circuit current.The reactance of reactor L3 is big more, and is big more to the restriction of short circuit current; But the capacitive reactance design load of capacitor C is just big in a kind of short-circuit current limiting device of transformer saturation characteristic, and investment is big.So the design of L3 reactor value needs to handle according to concrete electric power system balance.Reactor L3 generally adopts air core reactor, also can adopt the reactor of other kinds.
The turn ratio secondary coil L2 of transformer primary winding L1 is big, and transformer has the effect of amplifying the capacitor C capacitor value.But the current ratio transformer primary side of capacitor C is big.So the no-load voltage ratio of transformer needs to require balance to handle according to concrete economic technology.
When the Power System Shortcuts disappearance, the electric current of transformer primary winding L1 descends, and transformer core is unsaturated; A kind of short-circuit current limiting device of transformer saturation characteristic can recover operate as normal automatically.
Each parts of the short-circuit current limiting device of transformer saturation characteristic of the present invention can manufacture and design with prior art, can realize fully.Broad prospect of application is arranged.
Claims (3)
1. short-circuit current limiting device that utilizes the transformer saturation characteristic is characterized in that it comprises:
The transformer of forming by at least one primary winding L1 and at least one secondary coil L2; Wherein primary winding L1 one end is connected with reactor L3, and the other end is an input terminal, and the other end of reactor L3 is a lead-out terminal; Secondary coil L2 is then in parallel with capacitor C; Transformer core has saturation characteristic.
2. the short-circuit current limiting device that utilizes the transformer saturation characteristic as claimed in claim 1 is characterized in that transformer core was unsaturated when described electric power system normally moved, and transformer core was saturated when the short circuit current that flows through primary winding L1 reached setting value.
3. one kind is adopted the described method of work of utilizing the short-circuit current limiting device of transformer saturation characteristic of claim 1, it is characterized in that,
The short-circuit current limiting device series connection of transformer saturation characteristic is inserted transmitting loop;
When electric power system normally moved, transformer core was unsaturated; Capacitor C is by the coupling of transformer primary winding L1 and secondary coil L2, with reactor L3, the transmitting loop of connecting series connection; Little when capacitor C makes the transmitting loop impedance ratio not connect a kind of short-circuit current limiting device of transformer saturation characteristic;
When electric power system was short-circuited, short circuit current flow through primary winding L1, and transformer core was saturated when the short circuit current that flows through primary winding L1 reached setting value; The capacitive reactance of capacitor C is inoperative to transmitting loop, and reactor L3 connects with transmitting loop; Big when reactor L3 makes the transmitting loop impedance ratio not connect a kind of short-circuit current limiting device of transformer saturation characteristic; Reactor L3 limiting short-circuit current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100409537A CN102097794A (en) | 2011-02-21 | 2011-02-21 | Device and method for limiting short circuit current by utilizing saturation characteristics of transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100409537A CN102097794A (en) | 2011-02-21 | 2011-02-21 | Device and method for limiting short circuit current by utilizing saturation characteristics of transformer |
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| CN102097794A true CN102097794A (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100409537A Pending CN102097794A (en) | 2011-02-21 | 2011-02-21 | Device and method for limiting short circuit current by utilizing saturation characteristics of transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013163853A1 (en) * | 2012-05-04 | 2013-11-07 | 中国科学院电工研究所 | Reactor-type short circuit fault current limiter |
| CN103762576A (en) * | 2014-02-14 | 2014-04-30 | 戴先兵 | Self-saturation electric reactor type fault current limiter |
| CN104201903A (en) * | 2014-09-11 | 2014-12-10 | 山东大学 | Multifunctional transformer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1139593A (en) * | 1965-09-22 | 1969-01-08 | Ass Elect Ind | Improved resonant coupling between a.c. networks |
| CN2684435Y (en) * | 2004-02-19 | 2005-03-09 | 山东大学 | A fault current limiter |
| CN2882074Y (en) * | 2006-02-27 | 2007-03-21 | 南京师范大学 | Series active filter with short-circuit current-limit function |
-
2011
- 2011-02-21 CN CN2011100409537A patent/CN102097794A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1139593A (en) * | 1965-09-22 | 1969-01-08 | Ass Elect Ind | Improved resonant coupling between a.c. networks |
| CN2684435Y (en) * | 2004-02-19 | 2005-03-09 | 山东大学 | A fault current limiter |
| CN2882074Y (en) * | 2006-02-27 | 2007-03-21 | 南京师范大学 | Series active filter with short-circuit current-limit function |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013163853A1 (en) * | 2012-05-04 | 2013-11-07 | 中国科学院电工研究所 | Reactor-type short circuit fault current limiter |
| CN103762576A (en) * | 2014-02-14 | 2014-04-30 | 戴先兵 | Self-saturation electric reactor type fault current limiter |
| CN103762576B (en) * | 2014-02-14 | 2016-09-21 | 戴先兵 | Autotransducer type fault current limiter |
| CN104201903A (en) * | 2014-09-11 | 2014-12-10 | 山东大学 | Multifunctional transformer |
| CN104201903B (en) * | 2014-09-11 | 2016-08-31 | 山东大学 | A kind of Multifunction transformer |
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Application publication date: 20110615 |