CN201663433U - Protecting device for preventing short circuit caused in current transformer - Google Patents
Protecting device for preventing short circuit caused in current transformer Download PDFInfo
- Publication number
- CN201663433U CN201663433U CN2009201780310U CN200920178031U CN201663433U CN 201663433 U CN201663433 U CN 201663433U CN 2009201780310 U CN2009201780310 U CN 2009201780310U CN 200920178031 U CN200920178031 U CN 200920178031U CN 201663433 U CN201663433 U CN 201663433U
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- protective device
- current
- current transformer
- short circuit
- circuit
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Abstract
The utility model relates to a protecting device for preventing short circuit caused in a current transformer, belonging to the field of power electronic technique. The utility model particularly relates to a protecting device for preventing short circuit caused in the current transformer, especially an IGBT current transformer. The utility model also relates to the current transformer provided with the protecting device. According to an embodiment of the utility model, the protecting device for preventing short circuit caused in the current transformer is provided and comprises a first protecting device (50) with first action time (55), and a second protecting device (60) with second action time (65). In addition, short-circuit current (10) can be detected by the first protecting device (50) through desaturation effect of a semiconductor, and short-circuit current (10) can be detected by the second protecting device (65) through current rise.
Description
Technical field
The utility model relates to technical field of power electronics.The utility model relates to a kind of protective device that prevents that current transformer especially is short-circuited in the IGBT current transformer.The utility model also relates to a kind of current transformer with protective device described in the utility model.
Background technology
Bipolar transistor (IGBT=insulated gate bipolar transistor) with insulated gate electrode is a kind of semiconductor device that is widely used in technical field of power electronics.Can utilize bipolar transistor to make current transformer, be also referred to as the IGBT current transformer.In this class IGBT current transformer, may produce the short circuit current that damages the current transformer parts or destroy current transformer fully.Therefore need provide the protective device that under short-circuit conditions, to protect current transformer.
The utility model content
The purpose of this utility model is to provide a kind of reliable short-circuit protection to current transformer.
Described according to a kind of embodiment of the present utility model; a kind of protective device of preventing that current transformer is short-circuited of being used for is provided; described protective device comprises first protective device with first operate time or very first time interval, and comprises second protective device with second operate time or second time interval.Can utilize first protective device to detect short circuit current in addition, and can utilize second protective device to rise and detect short circuit current by electric current by the semi-conductive saturation effect of moving back.
Respectively from occurring measuring first operate time of first protective device and second operate time of second protective device in the short circuit.Therefore can determine very first time interval first operate time of first protective device, can determine second time interval second operate time of second protective device.Here, described very first time interval is independent of second time interval, that is to say, these two time intervals start from occurring in the short circuit, and finishes after the different duration.Therefore first protective device is used for reacting in very first time interval, and second protective device then is used for reacting in second time interval.
Described according to a kind of embodiment of the present utility model, semiconductor is a kind of IGBT.
IGBT is that insulated gate bipolar transistor is a kind of electronic device, especially can be applied to need to carry out rapidly the technical field of power electronics of electronic switch action.Also can utilize IBGT to make the current transformer that power is about 1MVA.
Described according to a kind of embodiment of the present utility model, second protective device has short-circuiting device.
Described short-circuiting device can link to each other with the intermediate circuit of current transformer.The electric energy of short-circuiting device in can the elimination system.For example electric capacity charging and when reaching voltage threshold, short-circuiting device will move in voltage rises by the direct current intermediate voltage circuit of current transformer.When middle circuit surpassed maximum permissible voltage, short-circuiting device also can trigger certain protective reaction.
Described according to a kind of embodiment of the present utility model, second protective device has first current monitoring device.
Described according to a kind of embodiment of the present utility model, second protective device has second current monitoring device.
First and second current monitoring devices can constitute with identical components and parts.First current monitoring device can link to each other with the positive middle circuit of current transformer, and second current monitoring device can link to each other with the negative middle circuit of current transformer.
Described according to a kind of embodiment of the present utility model, second operate time is bigger 10 times than first operate time at least.
The protective device that can react in different operate times can be provided by this way.Also can adopt cascade system, promptly when first protective device did not move after certain hour, second protective device can be made action.Refer to and detect a certain fault, trigger the All Time process of a certain protection mechanism so-called operate time until complete execute protection action.
Described according to a kind of embodiment of the present utility model, be about 20 μ s first operate time of first protective device.
Described according to a kind of embodiment of the present utility model, be about 500 μ s second operate time of second protective device.
Described according to a kind of embodiment of the present utility model, can utilize first protective device to cause local the disconnection.
The part that short circuit occurs or have certain damage when current transformer for example during the IGBT of certain damage, may need local the disconnection.Therefore, the components and parts that do not damage and be installed among the relevant short circuit paths can the partial cutoff fault, to prevent result's infringement.For example carry out and disconnect by IGBT.Then can under slave mode, close especially current transformer of whole system.Close current transformer and make whole system cut off the power supply, thereby make the related personnel can carry out maintenance work.This pass closed procedure may continue a few minutes, until the outage of the intermediate circuit of current transformer and can carry out maintenance work under situation about being safe from danger.
Described according to a kind of embodiment of the present utility model, first protective device can be less than carrying out local the disconnection within about 10 μ s times after short circuit occurring.
Within 10 μ s (microsecond), disconnect and to regard rapid disconnection as.
Described according to a kind of embodiment of the present utility model, can utilize second protective device monitoring VLSCD voltage.
VLSCD voltage (VLSCD: the voltage level short-circuit detecting) be the voltage that the VLSCD device provides.This VLSCD device can be used to monitoring current and rises, and VLSCD voltage is provided in view of the above.
Described according to a kind of embodiment of the present utility model, second protective device can cause certain safeguard measure when VLSCD voltage life period surpasses about 20 μ s.
Described according to a kind of embodiment of the present utility model, can utilize second protective device to make the direct-flow intermediate circuit of current transformer discharge rapidly.
With the direct-flow intermediate circuit discharge of current transformer is a kind of safeguard measure that can pass through the initiation of second protective device.Utilize discharge to eliminate electric energy in the direct-flow intermediate circuit, thereby make that no longer include within the current transformer can be for the electric energy that forms fault.
Described according to a kind of embodiment of the present utility model, current transformer has input, direct-flow intermediate circuit and output, and connects protective device described in the utility model between input and direct-flow intermediate circuit.
Described according to a kind of embodiment of the present utility model, protective device has the 3rd current monitoring device and the 4th current monitoring device, and described the 3rd current monitoring device and the 4th current monitoring device are arranged between direct-flow intermediate circuit and the output.
Adopt this arrangement form that protection can be provided when current transformer is in the four-quadrant operation pattern.Both can the feed-in electric energy, also can feedback electric energy.
Described according to a kind of embodiment of the present utility model, current transformer has protective device described in the utility model.
Described protective device can be integrated among the current transformer, be short-circuited to prevent current transformer.Here, can monitor whether short circuit of semiconductor in the current transformer.
Described according to a kind of embodiment of the present utility model, current transformer has some protective devices described in the utility model.
Can constitute polyphase inverter by this way, for example be used for the 3-phase power converter of drive machines and drive unit.
Description of drawings
Hereinafter with reference to accompanying drawing embodiment of the present utility model is described in detail.
Accompanying drawing 1 is depicted as and utilizes the sequential chart of identification current transformer short circuit to explain first kind of embodiment of the present utility model.
Accompanying drawing 2 is depicted as and utilizes the current transformer with the protective device that can prevent to occur in the current transformer short circuit to explain second kind of embodiment of the present utility model.
Employed Reference numeral and implication thereof all are summarised among the list of numerals in the accompanying drawing.Every identical or similar part all identifies with identical Reference numeral in principle.
Embodiment
Accompanying drawing 1 is depicted as and utilizes sequential Figure 100 of identification current transformer 200 internal short-circuits to describe first kind of embodiment of the present utility model.Sequential Figure 100 is depicted as first protective device 50 and second protective device 60.Accompanying drawing 1 is depicted as the operation principle of these two protective devices 50,60.If there is the short circuit shown in the Reference numeral 10, first protective device 50 will move within very first time interval 55, and second protective device 60 will move within second time interval 65.At this moment, first protective device 50 detects semiconductor device (being IGBT) here and moves back saturatedly, and causes safeguard measure.It is semi-conductive at short circuit all on off states constantly that all of current transformer are freezed in the expression of first safeguard measure 51.Another safeguard measure 52 expressions of first protective device 50 disconnect, the especially local semiconductor that relates to short circuit that disconnects.For example after first protective device 50 detects short circuit current 10, can within about 10 μ s, carry out disconnection or turn-off action.Therefore first protective device 50 can prevent from short circuit to occur in the current transformer 200, and this protection is moved within about 10 μ s～15 μ s.
Second protective device 60 can be monitored the voltage (VLSCD:VoltageLevel Short Circuit Detection) that the VLSCD device is provided, and detects short circuit in the current transformer 200 with this.Utilize the VLSCD device can be from the short circuit current in the current transformer 200 occurring detecting within about 20 μ s times in the short circuit current.After second protective device 60 identified short circuit current, second protective device 60 will discharge 61 in the direct-flow intermediate circuit of current transformer.Can utilize short-circuiting device 240 to discharge.Therefore second protective device 60 can prevent to be short-circuited in the current transformer 200, and this protection is available within about 500 μ s after short circuit 10 occurring.
Accompanying drawing 1 is depicted as first and second protective devices 50,60, and these protective devices are detected short circuit 10 by different way, and also can provide protection at the short circuit 10 that is occurred within different time interval 55,65.First protective device 50 provides protection within about 15 μ s, 60 of second protective devices provide protection within about 500 μ s.Therefore these two kinds of different protection mechanisms can be replenished when short circuit 10 occurring mutually.
Accompanying drawing 2 is depicted as the current transformer 200 with three-phase input end 210 and three-phase output end 290.Current transformer 200 has an input circuit 220 and an output circuit 280.Input circuit 220 and output circuit 280 are the three-phase pattern.Current transformer 200 also has a direct-flow intermediate circuit 250 that links to each other with output circuit 280 with input circuit 220 in addition.First current monitoring device 230 and second current monitoring device 330 are installed between input circuit 220 and direct-flow intermediate circuit 250.The 3rd current monitoring device 270 and the 4th current monitoring device 370 are installed between dc voltage circuit 250 and output circuit 280.First and second current monitoring devices 230,330 have a rising monitoring device 231,331 respectively.Third and fourth current monitoring device 270,370 also has a rising monitoring device 271,371 respectively in addition.Rising monitoring device 231,331,271,, 371 have a VLSCD circuit in parallel respectively with inductance or coil 232,332,272,372.Rising monitoring device 231,331,271,371 and inductance 232,332,272,372 are in parallel with the series circuit of being made up of diode 233,333,274,374 and resistance 234,334,273,373 respectively.In the circuit of the positive middle of current transformer, the negative electrode of diode 233,274 links to each other with an electric capacity 235,275 respectively.In the circuit of the negative middle of current transformer 200, the anode of diode 333,374 links to each other with an electric capacity 335,375.Between first and second current monitoring devices 230,330 and direct-flow intermediate circuit 250, a short-circuiting device 240 is installed.Short-circuiting device 240 has the series circuit of being made up of inductance 241,246 and some thyristors 243,245, and series resistance 242,244 is in parallel with series thyristor 243,245.
Direct-flow intermediate circuit 250 has first electric capacity 251 (being also referred to as positive middle circuit) and second electric capacity 252 (being also referred to as negative middle circuit), and these two electric capacity 251,252 are connected mutually.Direct-flow intermediate circuit 250 also has a neutral point 255 in addition, and this neutral point is between the connection of first electric capacity 251 and second electric capacity 252.
Current monitoring device 230,330,270,370 is used for monitoring current on the one hand and rises, and can improve the IGBT switching characteristic of current transformer 200 simultaneously.Be shorter than the current rise time under the failure condition current rise time under the nominal situation.Therefore can be according to inferring whether there is fault in the current transformer 200 current rise time.
Current transformer shown in the accompanying drawing 2 can be worked under the four-quadrant pattern, just advances and retreats.Three-phase input end 210 links to each other with the main power switch that equally also is three phase structures.For example the design power of current transformer 200 can reach 1MVA (megavolt-ampere).But this does not get rid of the utility model is applied in the bigger power bracket.
Below with the operation principle of the utility model current transformer shown in the description of the drawings 2.If current transformer 200 especially short circuit occurs in the IGBT current transformer shown in the figure, will disconnect current transformer 200 because of the moving back saturation effect of IGBT.So just can for example manufacturer's defined sometime in will install disconnection, and the situation of the device that can not be damaged.Owing to various reason, in for example same module on the incoherent IGBT electric arc appears, and be not under any circumstance all can prevent from further to destroy or infringement.Therefore can use some fuses, but this can increase the cost of overhaul under situation about breaking down.
Provided by the utility model is a kind of short circuit multi-stage protection scheme, both can carry out local the disconnection rapidly, also can trigger at the system level execute protection.Can avoid the bigger secondary failure of damage range, the IGBT shell of for example avoiding having result's infringement on a large scale damages, and method is short-circuiting device 240 to be used for protection trigger, and causes that by short circuit current arrangement for detecting 231,331,271,371 protection triggers.Can limit the semiconductor failure that short circuit causes, for example wrong switch, and can prevent to occur on the current transformer further fault.Here fuse can be used, therefore the cost of overhaul that breaks down and cause can be reduced.
The utility model provides two kinds of protection schemes, can utilize the semi-conductive saturation effect identification short circuit current that moves back, also can by electric current rise identification identical or phase place outside short circuit current.If a certain semiconductor in mutually is short-circuited, when being communicated with adjacent semiconductor, will form short circuit paths.This after-current will be elevated to above the current value under the normal running conditions.IGBT enters after electric current raises and moves back saturation condition, and voltage is raise.It is saturated to close moving back of IGBT at the appointed time, further infringement can not take place.Prevent that by closing IGBT the long period from producing short circuit current.In order to prevent in another path, short circuit to occur, can freeze all vectors, the on off state of each IGBT is remained unchanged.Feedback signal can be sent to higher level's control system, thereby disconnect the main power switch of current transformer 200, and can reliably close whole system, for example current transformer 200, thereby can the labor failure condition.
Local disconnection may be occurred under some situation and the situation that continues to break down can't be prevented.For example when electric arc appears in the some IGBT in the same enclosure, possibly can't carry out the part and disconnect.Under these failure conditions, short circuit current may become greatly, and damages other device.The inductance or the electric current rising inductance 232,332,272,372 that therefore will limit the electric current rising edge join among the circuit.Can improve switching characteristic like this, also can be used for monitoring simultaneously the electric current of current transformer 200.
Can use current potential to be equal to or higher than the so-called VLSCD circuit 231,331,271,371 (VLSCD=voltage level short circuit detection) of electric current rising inductance 232,332,272,372.These circuit are connected on some half direct-flow intermediate circuits, can measure a certain electric current in mutually and how long rise.It is several microseconds under normal operation that this electric current rises.And if certain fault, then current rise time is long.Can use this time interval to cause protection and trigger, thereby prevent that current transformer 200 from continuing to suffer damage.
Can monitor the voltage that electric current rises and produced in some inductance 232,332,272,372 respectively.When the voltage that monitors on the inductance 232,332,272,372 surpasses a certain magnitude of voltage, will generate triggering signal.If the duration of triggering signal less than about 20 μ s, then is a normal operating conditions.If but the duration of triggering signal greater than about 20 μ s, then have certain failure condition.By the duration of higher level's control system monitoring triggering signal, and under failure condition, cause protection and trigger.The protection triggering situation for example has: the motor that connected is implemented braking, and electric energy is fed back among the electrical network, make electric energy flow to the input 210 of current transformer 200 from output 290.If for example because certain fault makes electric energy to flow out by input 210, also promptly electric energy can't be fed back among the electrical network that is connected, then bosom circuit 250 will charge.Therefore electric capacity on the electric capacity 251,252 raise.When reaching unallowable higher voltage value, will cause protection by short-circuiting device 240 and trigger.
Provide protection to trigger by short-circuiting device 240, described protection trigger will short circuit current transformer 200 direct voltage electric capacity 251,252, and at first electric energy that absorbs constantly in the relevant short circuit paths.IGBT is connected among a certain phase, and makes its closure after most of energy especially changes heat into by thyristor 243,245 by short-circuiting device 240.The main power switch that can utilize the same signal that triggers short-circuiting device 240 will be connected on the input 210 disconnects.So just can disconnect current transformer 200 at short notice and make its no power, thereby needn't use fuse.Electric current rising arrangement for detecting 230,330,270,370 also can be detected the short circuit current 10 outside a certain phase, for example earth fault.When middle circuit 250 surpassed maximum permissible voltage, short-circuiting device 240 can also trigger a certain protective reaction.
Generally speaking, protection scheme provided by the utility model was both can local detecting some semi-conductively to move back saturatedly, also can trigger by execute protection.First contains internal short-circuit mutually with the partial short-circuit protective device 221,281 of the 3rd protective device 50.The short-circuiting device 240 of second protective device 60 has higher level's function, except the phase short circuit, also contains other short-circuit conditions, for example intermediate circuit overvoltage or earth fault.If current transformer 200 is under the four-quadrant operation pattern, preferably use the first and the 3rd protective device simultaneously.
Employed Reference numeral and implication thereof all have been summarised among a inventory in the accompanying drawing.Every identical or similar part all identifies with identical Reference numeral in principle.Need to replenish and to point out: " comprising " do not get rid of other element or step, and do not get rid of and have " a plurality of ".It is further noted that: also can be used in combination with feature or the step of above-mentioned other embodiment with reference to described feature of above-mentioned some embodiment or step.The effect of being not limited to them of Reference numeral in the claim.
Need to replenish and to point out: " comprising " do not get rid of other element or step, and " one " do not get rid of exist a plurality of.It is further noted that: also can be used in combination with feature or the step of above-mentioned other embodiment with reference to described feature of above-mentioned some embodiment or step.The effect of being not limited to them of Reference numeral in the claim.
List of numerals
10 short circuits
50 first protective devices
51 first safeguard measures
52 other safeguard measures
55 very first time intervals
60 second protective devices
61 discharges
65 second time intervals
200 current transformers
210 three-phase input ends
220 input circuits
221 first protective devices
230 first current monitoring devices
231 first rising monitoring devices
232 inductance
233 diodes
234 resistance
235 electric capacity
The short-circuiting device of 240 second protective devices
241 inductance
242 parallel resistances
243 thyristors
244 parallel resistances
245 thyristors
246 inductance
250 direct-flow intermediate circuits
Electric capacity in the 251 positive middle circuit
Electric capacity in the 252 negative middle circuit
255 neutral points
270 the 3rd current monitoring devices
271 the 3rd rising monitoring devices
272 inductance
273 resistance
274 diodes
275 electric capacity
280 output circuits
281 the 3rd protective devices
290 outputs
330 second current monitoring devices
331 second rising monitoring devices
332 inductance
333 diodes
334 resistance
335 electric capacity
370 the 4th current monitoring devices
371 the 4th rising monitoring devices
372 inductance
373 resistance
374 diodes
375 electric capacity
Claims (15)
1. be used to prevent to occur in the current transformer (200) protective device of short circuit current (10); described protective device comprises first protective device (50) with first operate time; and comprise second protective device (60) with second operate time; can utilize first protective device (50) to detect short circuit current (10), and can utilize second protective device (60) to rise and detect short circuit current (10) by electric current by the semi-conductive saturation effect of moving back.
2. protective device according to claim 1, described semiconductor are a kind of IGBT.
3. protective device according to claim 1, described second protective device (60) has short-circuiting device (240).
4. according to each described protective device in the claim 1～3, described second protective device (60) has first current monitoring device (230).
5. according to each described protective device in the claim 1～3, described second protective device (60) has second current monitoring device (330).
6. according to each described protective device in the claim 1～3, described second operate time is bigger at least 10 times than first operate time.
7. according to each described protective device in the claim 1～3, be approximately 20 μ s described first operate time.
8. according to each described protective device in the claim 1～3, be approximately 500 μ s described second operate time.
9. according to each described protective device in the claim 1～3, utilize first protective device (50) to cause local the disconnection.
10. protective device according to claim 9, described first protective device (50) are carried out local the disconnection within afterwards less than 10 μ s times short circuit (10) occurring.
11., utilize second protective device (60) monitoring VLSCD voltage according to each described protective device in the claim 1～3.
12. according to each described protective device in the claim 1～3, described second protective device (60) causes a kind of safeguard measure when the life period of VLSCD voltage is longer than 20 μ s.
13., utilize second protective device (60) to make the direct-flow intermediate circuit (250) of current transformer (200) discharge according to each described protective device in the claim 1～3.
14. have the current transformer (200) of input (210), direct-flow intermediate circuit (250) and output (280), between described input (210) and direct-flow intermediate circuit (250), connect any one described protective device in the claim 1～13.
15. current transformer according to claim 14 (200); described protective device has the 3rd current monitoring device (270) and the 4th current monitoring device (370), and described the 3rd current monitoring device (270) and the 4th current monitoring device (370) are installed between direct-flow intermediate circuit (250) and the output (290).
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP09171100A EP2302797A1 (en) | 2009-09-23 | 2009-09-23 | Control for a semiconductor device |
| EP09171101A EP2302798A1 (en) | 2009-09-23 | 2009-09-23 | Control for a semiconductor device |
| EP091711010 | 2009-09-23 | ||
| EP091711002 | 2009-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201663433U true CN201663433U (en) | 2010-12-01 |
Family
ID=43027148
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201780310U Expired - Lifetime CN201663433U (en) | 2009-09-23 | 2009-10-16 | Protecting device for preventing short circuit caused in current transformer |
| CN2009202913095U Expired - Lifetime CN201797307U (en) | 2009-09-23 | 2009-10-16 | Protection control circuit |
| CN2009201780274U Expired - Lifetime CN201623694U (en) | 2009-09-23 | 2009-10-16 | Assembly controlling semiconductor element and large power circuit and device with assembly |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202913095U Expired - Lifetime CN201797307U (en) | 2009-09-23 | 2009-10-16 | Protection control circuit |
| CN2009201780274U Expired - Lifetime CN201623694U (en) | 2009-09-23 | 2009-10-16 | Assembly controlling semiconductor element and large power circuit and device with assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN201663433U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305816A (en) * | 2015-11-09 | 2016-02-03 | 飞毛腿(福建)电子有限公司 | Method for realizing circuit control by adopting series connection of field-effect tubes |
-
2009
- 2009-10-16 CN CN2009201780310U patent/CN201663433U/en not_active Expired - Lifetime
- 2009-10-16 CN CN2009202913095U patent/CN201797307U/en not_active Expired - Lifetime
- 2009-10-16 CN CN2009201780274U patent/CN201623694U/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN201623694U (en) | 2010-11-03 |
| CN201797307U (en) | 2011-04-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101201 |
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| CX01 | Expiry of patent term |