CN2267571Y - Loss-free and resistor type arrangement for limiting excess current at short-circuit emergency - Google Patents
Loss-free and resistor type arrangement for limiting excess current at short-circuit emergency Download PDFInfo
- Publication number
- CN2267571Y CN2267571Y CN 96231751 CN96231751U CN2267571Y CN 2267571 Y CN2267571 Y CN 2267571Y CN 96231751 CN96231751 CN 96231751 CN 96231751 U CN96231751 U CN 96231751U CN 2267571 Y CN2267571 Y CN 2267571Y
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- China
- Prior art keywords
- drain electrode
- superconducting coil
- resistor
- lossless
- current
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Abstract
The utility model discloses a lossless resistor type device for limiting excess current at short-circuit emergency. The utility model is suitable for three-phase or single-phase alternating current or direct current electric power systems. The lossless resistor is composed of superconducting coils of an alternating current-alternating current frequency conversion bridge circuit; the lossless resistor has the current-voltage characteristics of a resistance element and has no electric energy loss in action; the resistance of the lossless resistor can be optionally and continuously changed by controlling each electronic switch of the bridge circuit. Compared with the present widely used current-limiting reactor, the utility model has the advantages of energy saving, light weight, high power factor, no voltage loss in the normal operation of the electric power system, etc.
Description
The utility model belongs to electrical technology field, is specifically related to a kind of Power System Shortcuts current limiting device that is used to limit.
As everyone knows, electric power system when being short-circuited fault, its current value normally operating current ten surplus times, thermal effect that it produced and stress effect are serious to the harm of electric equipment and cable, need be limited.Electrician circle extensively adopts " current limiting reactor " to come limiting short-circuit current at present, but after current limiting reactor is sealed in electric power system, under normal operation: its can the increase electric power loss of voltage and electric energy loss of system, and the phase angle is increased, influence power supply quality, and have shortcomings such as volume is big, floor space is big.
The purpose of this utility model is to provide a kind of electric energy loss of system and short-circuit current limiting device at phase angle of can not increasing electric power.
Short-circuit current limiting device of the present utility model is achieved in that connects lossless resistor with electrical load, be applied to the three-phase ac power system, single phase alternating current (A.C.) system and direct current power system all can, key is to have adopted lossless resistor, this resistor is by handing over an ac frequency converter and superconducting coil and control circuit to form, because handing over an ac frequency converter is to connect to two-way bridge-type frequency converter by electronic switching device, it is that to be used for 50 hertz power-frequency voltage is modulated into frequency be f
sThe high frequency voltage ripple of=1/2h is given superconducting coil, under the driving of control circuit, sees over from input A, B two ends like this, and one in this device does not have the electric energy loss device, has the resistive voltage-current characteristic, the adjustable lossless resistor of its resistance.
Owing to utilize lossless resistor to connect with electrical load, when electric power system is short-circuited fault, limit the numerical value of short circuit current with the high resistance of lossless resistor, but when electric power system is in normal condition and does not have short trouble, the resistance of this lossless resistor is zero, electric power system is not had influence, the utility model is described in detail below in conjunction with accompanying drawing:
The winding diagram of accompanying drawing 2. lossless resistors
The winding diagram of accompanying drawing 3. lossless resistors in direct current power system
Accompanying drawing 4. the utility model fundamental diagram when electric power system is broken down
(a) and (b) in the accompanying drawing 1, (c) represent that respectively restraint device of the present utility model is connected situation in three-phase ac power system, direct current power system and single phase alternating current (A.C.) electric power system, and wherein: (1), (2), (3), (7), (9) are lossless resistor; (4), (5), (6), (8), (10) are electrical load.
The utility model is series in all kinds of electric power systems by lossless resistor and electrical load and constitutes, in the three-phase ac power system, connect with electrical load (4), (5), (6) respectively in three lossless resistors (1), (2), (3), in direct current power system, lossless resistor (9) is connected with electrical load (10).And the two-way bridge-type frequency converter that lossless resistor is connected into by electronic switching device (11), (12), (13), (14), (15), (16), (17), (18), superconducting coil (19) and control circuit (20) are formed.Wherein electronic switching device (11), (12), (13), (14), (15), (16), (17), (18) can be that igbt (IGBT) also can adopt power field effect transistor (MOSFET), turn-off thyristor (GTO).
Key technology parts of the present utility model are lossless resistors, the device connecting mode that respectively do not have of this lossless resistor is: electronic switching device (11) is connected with (14), (13) connect with (12), (15) connect with (18), connect with (16) (17), then (11) drain electrode e, (15) with (13) are linked together with the drain electrode c of (17); (14), and guide an end of superconducting coil (19) after will (11) being connected to each other into the drain electrode e of the drain electrode c of (18) and (15) and (14) with the drain electrode e of the drain electrode c of (12) and (18) and (16) the composition bridge circuit that links together; The other end of guiding superconducting coil (19) into after the drain electrode e of the drain electrode c of (13) and (16) and (12) and (17) is connected to each other.
When eight electronic switching devices of lossless resistor all adopt igbt right, in the following positive half period of AC supply voltage, on the grid of electronic switching device (15), (16), (17), (18), apply the forward tripping impulse continuously and make its conducting, move by the diode mode.As shown in Figure 3, when lossless resistor is used for direct current power system, electronic switching device (21), (22), (23), (24), still use IGBT, fast diode is used in electronic switching device (25), (26), (27), (28), is actually to change the electronic switching device in the AC supply voltage (15), (16), (17), (18) into fast diode and be respectively (25), (26), (27), (28).When electric power system normally moved no short circuit accident, IGBT (21), (22), (23), (24) all were in the saturation conduction state, with superconducting coil (29) short circuit, into from input AB like this, and it equals a resistance is zero device.Be further elaborated below in conjunction with 3,4 pairs of the utility model operation principles of accompanying drawing:
(the t==T in the accompanying drawing 4 for example of the accident if electric power system at a time is short-circuited
sBe short-circuited in/4 o'clock), just to begin with the frequency be f to each electronic switching device
s, duty ratio (duty ratio) be 0.5 on-off mode take turns conducting with end.
At T
s/ 4≤t≤T
s/ 2 time phases, IGBT (21), (22) saturation conduction, end (23), (24), and superconducting coil is access in electric power system, and its coil current ic rises from zero beginning straight line, to t=T
sTill/the L, during this period of time superconducting coil magnetizes, and, is stored in the magnetic field of coil to its conveying capacity by power supply.
At T
s/ 2≤t≤3T
s/ 4 time phases, all end IGBT (21), (22), (23), (24), and the current i c in the superconducting coil flows back to power supply via diode (27), (28), and its numerical value straight line descends, and the energy of being store in the superconducting coil is returned power supply, to t=3T
s/ 4 o'clock, ic reduced to zero.Because duty ratio d=0.5, so the time energy in the coil discharge just and finish.
At 3T
s/ 4≤t≤T
sTime phase, IGBT (23), (24) saturation conduction, end (21), (22), and this moment is owing to the voltage V that is added on the superconducting coil
cChange direction, so the current i c in the superconducting coil also changes direction and straight line increases, to t=T
sThe time till, during this period of time in, superconducting coil magnetizes in the other direction, preserves energy in the coil, energy is from power supply.
At T
s/ 2≤t≤5T
s/ 4 time phases, all end IGBT (21), (23), (24), and the current i c in the superconducting coil flows back to power supply via diode (25), (26), and current i c straight line reduces, because duty ratio d=0.5, so at t=5T
sIc reduced to zero just in/4 o'clock, and energy all returns power supply in the coil.
So go round and begin again, by frequency f s periodic duty, till short circuit accident is eliminated.
Till this section period, superconducting coil periodically is access in electric power system, power system impedance is increased, thereby reduced short-circuit current value, and by curve shown in the accompanying drawing 4 as can be known, this installs not consumed power.
Do not produce circuit and the equipment of high-frequency current through electric power system if do not wish lossless resistor, then can adopt high pass filter (100) in parallel with lossless resistor, the two ends of high pass filter (100) are connected in parallel on the A of lossless resistor, B two ends respectively.Because the voltage wave on its input A, the B and the line that covers of electric current are synchronous, in other words, it has the resistive voltage-current characteristic, does not have electric energy loss again.
Superconducting coil in the utility model (19) is thread by the superconductor metal that impregnated in the liquefied ammonia cooling agent, can adopt (B
i, P
b)
2Sr
2C
aC
U3O
10+xThe metal wire or the YB of silicate embedding silver
A2Cu
3O
7-xYBCO superconducting metal line.The shape of superconducting coil (19) can be spiral cast or dish-type.For the ease of industrialization, superconducting coil (19) also can adopt the lead coiling of common oxygen-free high conductivity type copper, as long as its resistance is very little, just can obtain the approximate product of industrial satisfaction.
Claims (4)
1. lossless resistor formula short-circuit current limiting device, comprise resistor, electrical load, it is characterized in that: adopt lossless resistor and electrical load to be series in all kinds of electric power systems, and lossless resistor is made of two-way bridge-type change frontal organ, superconducting coil (19) and control circuit (20) that electronic switching device (11), (12), (13), (14), (15), (16), (17), (18) are connected into.
2. restraint device according to claim 1, it is characterized in that: electronic switching device (11) is connected with (14), connect with (12) (13), connect with (18) (15), connect with (16) (17), then (11) drain electrode e, (15) with (13) is linked together with the drain electrode c of (17); (14), and guide an end of superconducting coil (19) after will (11) being connected to each other into the drain electrode e of the drain electrode c of (18) and (15) and (14) with the drain electrode e of the drain electrode c of (12) and (18) and (16) the composition bridge circuit that links together; The other end of guiding superconducting coil (19) into after the drain electrode e of the drain electrode c of (13) and (16) and (12) and (17) is connected to each other.
3. current-limiting apparatus according to claim 1 and 2, it is characterized in that: in the positive half period of AC supply voltage, on the grid of electronic switching device (15), (16), (17), (18), apply the forward trigger impulse continuously, make its conducting, move by the diode mode; And in the negative half-cycle of AC supply voltage, on the grid of electronic switching device (11), (12), (13), (14), apply the forward tripping impulse continuously, and make its conducting, move by the diode mode; When lossless resistor is applied to direct current power system, changes electronic switching device (15), (16), (17), (18) into fast diode and be respectively (25), (26), (27), (28).
4. restraint device according to claim 1 and 2, it is characterized in that: superconducting coil (19) is to be made by the superconductor metal wire that impregnated in the cooled with liquid nitrogen agent, the shape of superconducting coil (19) can be spiral cast or dish-type, and superconducting coil (19) also can adopt the lead coiling of common oxygen-free high conductivity type copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96231751 CN2267571Y (en) | 1996-04-30 | 1996-04-30 | Loss-free and resistor type arrangement for limiting excess current at short-circuit emergency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96231751 CN2267571Y (en) | 1996-04-30 | 1996-04-30 | Loss-free and resistor type arrangement for limiting excess current at short-circuit emergency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2267571Y true CN2267571Y (en) | 1997-11-12 |
Family
ID=33908843
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96231751 Expired - Fee Related CN2267571Y (en) | 1996-04-30 | 1996-04-30 | Loss-free and resistor type arrangement for limiting excess current at short-circuit emergency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2267571Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521078B (en) * | 2008-11-25 | 2011-06-29 | 天水电气传动研究所有限责任公司 | Superconducting magnet with quench protection circuit |
-
1996
- 1996-04-30 CN CN 96231751 patent/CN2267571Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521078B (en) * | 2008-11-25 | 2011-06-29 | 天水电气传动研究所有限责任公司 | Superconducting magnet with quench protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |