CN102769276A - Implementing method of protecting IEGT (injection enhanced gate transistor) based on relay protection tripping signal - Google Patents
Implementing method of protecting IEGT (injection enhanced gate transistor) based on relay protection tripping signal Download PDFInfo
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Abstract
The invention discloses an implementing method of protecting an IEGT (injection enhanced gate transistor) based on a relay protection tripping signal, belonging to the field of control. The implementing method comprises the steps of: introducing a 'tripping' control signal of a breaker into logic trigger conditions of a blocking IEGT triggering pulse module to form a mode of new logic trigger conditions of the blocking IEGT triggering pulse module together with original logic trigger conditions, outputting a 'blocking IEGT triggering pulse' signal through the blocking IEGT triggering pulse module after a microcomputer protection device outputs the 'tripping' control signal, before the 'tripping' mechanical action of the breaker, shielding/blocking the triggering pulse of the IEGT in a frequency convertor so as to turn off the IEGT and avoid the impact on the IEGT caused by a di/dt current mutation value impact, and to protect the IEGT. The protection action mechanism of the implementing method is cleverly set and easily achieved, and according to the protection action mechanism, the needed time of an on-site repair process is shortened greatly, the production can be resumed quickly and the production/maintenance cost can be lowered. The implementing method can be widely applied to the control/protection field of the driving system of a rolling mill set.
Description
Technical field
The invention belongs to the control field, relate in particular to a kind of control/guard method that is used for high-pressure frequency-conversion apparatus electronic device.
Background technology
The drive system of the existing rolling unit of cold rolling mill, great majority are to adopt high-power friendship-straight-alternation control system frequently, and this frequency-changing control system receives the control of milling train transmission PLC, and the output characteristic of power source of frequency converter is controlled.
The cold rolling 20 roller units of applicant enterprise, the electronic devices and components that the middle repoussage stream part of its rolling drive system is used are IEGT.
IEGT (Injection Enhanced Gate Transistor, electronics IEGT) is the above IGBT series power electronic device of the withstand voltage 4KV of reaching, and has realized low on-state voltage through the structure of taking to strengthen injection.
IEGT has characteristics such as low-loss, high speed motion, high withstand voltage, active grid driving intellectuality, is having much potentiality aspect the expansion current capacity.
The supply power mode of rolling drive system is 35KV feeder line (referring to an accompanying drawing 1); Through rectifier transformer TB converter plant (representing with frequency converter among the figure) is supplied power; Protection for feed line adopts current quick-breaking, the overcurrent protection in band time limit, non electrical quantity protections such as rectifier transformer employing differential protection and gas temperature, pressure release.
When fault such as three-phase shortcircuit takes place when the supply line of converter plant (representing the fault point with Id among the figure); The detected feeder current signal of microcomputer protecting device is greater than the current quick-breaking setting value; Then microcomputer protecting device output " tripping operation " control signal is to the primary cut-out CB in the supply line; The actuator of primary cut-out carries out " tripping operation " action, the supply line of breaking off converter plant according to " tripping operation " control signal.
Usually, from fault take place moment, to the switch motion of circuit breaker open failure point, during time of delay be about 30ms to 60ms.
Because the fault origination point is in the supply line of converter plant, not in the protection range of converter plant, but the fault current size is constant, and the fault current direction is (referring to the fault current direction in the accompanying drawing 1) that flows to the fault point.
Owing to be that the short time electric current of (can regard moment as) changes suddenly, then di/dt current break value is impacted impact and the punch through damage that the IEGT components and parts that will cause frequency converter rectifying part (representing with frequency converter among the figure) receive di/dt current break value.
Because the acquisition price of frequency converter rectifying part IEGT components and parts is higher; Install at the scene, the debugging quantities is bigger, and before components and parts are changed, remain " coupling " problem between components and parts, selects suitable components and parts comparatively to bother; So in case above-mentioned fault takes place; The on-site procedure for repairing required time is longer, and maintenance cost is higher, is unfavorable for resuming production rapidly and reducing production/maintenance cost.
In the prior art,, still there are not ripe and the practicable prevention method or the precautionary measures for above-mentioned situation.
Summary of the invention
Technical problem to be solved by this invention provides a kind of implementation method of protecting trip signal protection IEGT based on continuing; It is according to the output signal of microcomputer protecting device; Come to block in advance the trigger impulse of IEGT; Make that at primary cut-out before tripping operation, the impact of fault current can not damage the IEGT components and parts, thoroughly the hidden danger on the solution equipment.
Technical scheme of the present invention is: a kind of implementation method of protecting trip signal protection IEGT based on continuing is provided; Comprise when load/system for field breaks down signal; Blockade IEGT trigger impulse module among the PLC of drive system, output " blockade IEGT trigger impulse " signal, the trigger impulse of IEGT in the shielding converter plant; Realize the shutoff of IEGT, IEGT is protected; It is characterized in that described implementation method of protecting trip signal protection IEGT based on continuing comprises the following steps:
A, in the PLC of drive system, block in original logical triggering condition of IEGT trigger impulse module; Increase " circuit breaker trip fault " intermediate variable, described " circuit breaker trip fault " intermediate variable and existing logical triggering condition constitute the relation of logical;
B, with circuit breaker " tripping operation " control signal output ends of microcomputer protecting device, introduce among the PLC of drive system through the I/O port;
C, when the feeder current signal of converter plant supply line during greater than the current quick-breaking setting value, microcomputer protecting device output circuit breaker " tripping operation " control signal, described circuit breaker " tripping operation " control signal is admitted among the PLC of drive system through the I/O port;
D, in the PLC of drive system, according to received circuit breaker " tripping operation " control signal, adopt the mode of edge-triggered, " circuit breaker trip fault " intermediate variable is carried out assignment, be " 1 ";
E, " circuit breaker trip fault " intermediate variable and original logical triggering condition of blocking IEGT trigger impulse module are carried out the logical computing, produce asserts signal, the logical triggering condition of blocking IEGT trigger impulse module is satisfied;
F, blockade IEGT trigger impulse module output " blockade IEGT trigger impulse " signal; The trigger impulse of IEGT in the shielding/blockade converter plant; Before " short-circuit protection ", killer switch " tripping operation " action take place the high pressure inlet wire, IEGT is implemented in off state;
G, through circuit breaker " tripping operation " control signal being introduced the logical triggering condition of blockade IEGT trigger impulse module; Together constitute the mode of blocking the new logical triggering condition of IEGT trigger impulse module with original logical triggering condition, after microcomputer protecting device output " tripping operation " control signal, by blocking IEGT trigger impulse module output " blockade IEGT trigger impulse " signal; Get the jump on before " tripping operation " mechanical action of circuit breaker; The trigger impulse of IEGT in the shielding/blockade converter plant is realized the shutoff of IEGT, and protection IEGT does not receive the impact of electric current; Avoid di/dt current break value to impact impact, IEGT is protected IEGT.
Concrete; In the PLC of said drive system,, join in the data type conversion module " high voltage short circuit tripping operation " signal; Obtain the double byte variable; Double byte variable that obtains and Fault Control effective word are carried out position and operation, judge whether the result of its output equals 0, obtain Fault.tripWord1 fault word.
Further, together as the logical "or" gate input signal, obtain fault useful signal Fault.Trip Effect on by described fault word Fault.tripWord1 and other original logical triggering condition fault words through the set module.
Further; Described fault useful signal Fault.Trip Effect on is with the input signal of other original logical triggering condition fault-signals as the set control module; Obtain pulse blocking signal Pulse Enable; The IEGT that pulse blocking signal Pulse Enable is passed to frequency transformer control module triggers Enable Pin EnblBklge, blocks IEGT and triggers.
Concrete, whether the PLC detection failure word of said drive system equals " 0 ", and when the fault word equaled " 0 ", the expression system did not have fault, need not shield the trigger impulse of IEGT; When the fault word is not " 0 " or when " 1 ", show that there is fault in system, this moment, PLC made that through the set module IEGT trigger impulse is invalid, reached and blocked the IEGT functions of modules, utilized the physical property of IEGT, made it not receive the impact of high pressure.
Concrete, described blockade IEGT triggers, and adds reverse voltage through the grid-emitter-base bandgap grading at IEGT, makes the former reverse potential barrier that forms on surface, grid P district disappear, thereby realizes the shutoff of IEGT.
Further, described " high voltage short circuit tripping operation " signal can be resetted by " resetting " signal among the drive system PLC.
Compare with prior art, advantage of the present invention is:
1. primary cut-out " high voltage short circuit tripping operation " signal is introduced the chain condition that blocks the IEGT trigger impulse; On the basis that does not influence original function, after microcomputer protecting device output " tripping operation " control signal, before " tripping operation " mechanical action of circuit breaker; The trigger impulse of IEGT in the shielding/blockade converter plant; Realize the shutoff of IEGT, protection IEGT avoids the impact of mutation current, and IEGT is protected.
2. utilize the characteristics of the time of signal of telecommunication realization faster than the mechanical action time; Come to block in advance the trigger impulse of IEGT according to the guard signal of high-voltage switch gear; Got the jump on before " tripping operation " mechanical action of circuit breaker, close the IEGT components and parts, thoroughly the hidden danger on the solution equipment.
3. protection action mechanism is provided with ingenious; Install at the scene of having reduced the fault recovery stage, the debugging quantities; Shortened the on-site procedure for repairing required time greatly, reduced maintenance cost and standby redundancy quantity, helped resuming production rapidly and reducing production/maintenance cost.
Description of drawings
Fig. 1 is rolling transmission electric power system short trouble sketch map;
Fig. 2 is a hardware principle block diagram of the present invention;
Fig. 3 is the block diagram of control method of the present invention;
Fig. 4 is a control program logic diagram of the present invention;
Fig. 5 blocks the logical triggering condition sketch map of IEGT trigger impulse module for the present invention;
Fig. 6 is the logic diagram of Fault.tripWord1 signal of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Among Fig. 1; The supply power mode of existing rolling drive system is the 35KV feeder line; Through rectifier transformer TB converter plant (representing with frequency converter among the figure) is supplied power; Protection for feed line adopts current quick-breaking, the overcurrent protection in band time limit, non electrical quantity protections such as rectifier transformer employing differential protection and gas temperature, pressure release.
When fault such as three-phase shortcircuit takes place when the supply line of converter plant (representing the fault point with Id among the figure); The detected feeder current signal of microcomputer protecting device is greater than the current quick-breaking setting value; Then microcomputer protecting device output " tripping operation " control signal is to the primary cut-out CB in the supply line; The actuator of primary cut-out carries out " tripping operation " action, the supply line of breaking off converter plant according to " tripping operation " control signal.
Because the fault origination point is in the supply line of converter plant, not in the protection range of converter plant, but the fault current size is constant, and the fault current direction is (referring to the fault current direction indication in the accompanying drawing) that flows to the fault point.
Owing to be that the short time electric current of (can regard moment as) changes suddenly, then di/dt current break value is impacted impact and the punch through damage that the IEGT components and parts that will cause frequency converter rectifying part (representing with frequency converter among the figure) receive di/dt current break value.
Usually, from fault take place moment, to the switch motion of circuit breaker open failure point, during time of delay be about 30ms to 60ms.
Among Fig. 2; On hardware connects,, introduce among the PLC of drive system through the I/O port with circuit breaker " tripping operation " control signal output ends of microcomputer protecting device; Provide auxiliary signal to be connected by the high voltage supply switching signal, increase an input point with the input module of milling train transmission PLC.
Logic control thinking of the present invention is on the basis that does not influence original controlled function; Through the hardware input signal is carried out logic control and judgement; Form new controlled condition with other conditions of blocking IEGT trigger impulse module, reach the function of coming to block in advance the trigger impulse of IEGT according to the high-voltage switch gear signal.
Among Fig. 3, the present invention includes the following step:
A, in the PLC of drive system, block in original logical triggering condition of IEGT trigger impulse module; Increase " circuit breaker trip fault " intermediate variable, described " circuit breaker trip fault " intermediate variable and existing logical triggering condition constitute the relation of logical;
B, with circuit breaker " tripping operation " control signal output ends of microcomputer protecting device, introduce among the PLC of drive system through the I/O port;
C, when the feeder current signal of converter plant supply line during greater than the current quick-breaking setting value, microcomputer protecting device output circuit breaker " tripping operation " control signal, described circuit breaker " tripping operation " control signal is admitted among the PLC of drive system through the I/O port;
D, in the PLC of drive system, according to received circuit breaker " tripping operation " control signal, adopt the mode of edge-triggered, " circuit breaker trip fault " intermediate variable is carried out assignment, be " 1 ";
E, " circuit breaker trip fault " intermediate variable and original logical triggering condition of blocking IEGT trigger impulse module are carried out the logical computing, produce asserts signal, the logical triggering condition of blocking IEGT trigger impulse module is satisfied;
F, blockade IEGT trigger impulse module output " blockade IEGT trigger impulse " signal; The trigger impulse of IEGT in the shielding/blockade converter plant; Before " short-circuit protection ", killer switch " tripping operation " action take place the high pressure inlet wire, IEGT is implemented in off state;
G, through circuit breaker " tripping operation " control signal being introduced the logical triggering condition of blockade IEGT trigger impulse module; Together constitute the mode of blocking the new logical triggering condition of IEGT trigger impulse module with original logical triggering condition, after microcomputer protecting device output " tripping operation " control signal, by blocking IEGT trigger impulse module output " blockade IEGT trigger impulse " signal; Get the jump on before " tripping operation " mechanical action of circuit breaker; The trigger impulse of IEGT in the shielding/blockade converter plant is realized the shutoff of IEGT, and protection IEGT does not receive the impact of electric current; Avoid di/dt current break value to impact impact, IEGT is protected IEGT.
Concrete; In the PLC of said drive system,, join in the data type conversion module " high voltage short circuit tripping operation " signal; Obtain the double byte variable; Double byte variable that obtains and Fault Control effective word are carried out position and operation, judge whether the result of its output equals 0, obtain Fault.tripWord1 fault word.
Further, together as the logical "or" gate input signal, obtain fault useful signal Fault.Trip Effect on by described Fault.tripWord1 fault word and other original logical triggering condition fault words through the set module.
Further; Described fault useful signal Fault.Trip Effect on is with the input signal of other original logical triggering condition fault-signals as the set control module; Obtain pulse blocking signal Pulse Enable; The IEGT that pulse blocking signal Pulse Enable is passed to frequency transformer control module triggers Enable Pin EnblBklge, blocks IEGT and triggers.
Concrete, whether the PLC detection failure word of said drive system equals " 0 ", and when the fault word equaled " 0 ", the expression system did not have fault, need not shield the trigger impulse of IEGT; When the fault word is not " 0 " or when " 1 ", show that there is fault in system, this moment, PLC made that through the set module IEGT trigger impulse is invalid, reached and blocked the IEGT functions of modules, utilized the physical property of IEGT, made it not receive the impact of high pressure.
Concrete, described blockade IEGT triggers, and adds reverse voltage through the grid-emitter-base bandgap grading at IEGT, makes the former reverse potential barrier that forms on surface, grid P district disappear, thereby realizes the shutoff of IEGT.
Further, described " high voltage short circuit tripping operation " signal can be resetted by " resetting " signal among the drive system PLC.
Logic control thinking of the present invention is summarized as follows:
1, reads " tripping operation " signal of on-the-spot high-voltage switch gear microcomputer protecting device, confirm the logical relation of this signal and HV_Trip Intent, and select trigger module, make HV_Trip Intent to reset, in case can cancel function during the program function mistake.
2, by the fault-signal of HV_Trip Intent as down-stream; Thus other fault-signals of fault-signal and system for field such as high-voltage trip signal, tightly stop fault-signal, circuit breaker failure, earthed switch fault, precharge fault, insulation fault, dc bus fault etc. and constitute fault word (double byte) together; With can the time significance bit of fault is set; Make and to shield corresponding fault through significance bit is set when not needing corresponding failure in system.
3, whether the failure judgement word equals zero, and when equaling " 0 ", the expression system does not have fault, need not shield the trigger impulse of IEGT.When not being " 1 " for " 0 ", show that there is fault in system, make that through the set module IEGT trigger impulse is invalid this moment, reaches to block the IEGT functions of modules, utilizes the physical property of IEGT, makes it not receive the impact of high pressure.
In addition, the control logic thinking of prior art, normally protective device output " tripping operation " control signal; Remove to drive primary cut-out and accomplish " tripping operation " mechanical action; Because " tripping operation " mechanical action of primary cut-out drives its auxiliary contact action, sends the output signal of " tripping operation is accomplished " to control or signal system; The output signal of " tripping operation accomplish " that other control system is sent according to this auxiliary contact via primary cut-out; Control the IEGT module and quit work, this also existing just IEGT is subject to di/dt current break value and impacts the reason that spoilage is higher.
And the present technique scheme is utilized the time difference of " propagation of the signal of telecommunication is faster than mechanical action "; " tripping operation " control signal of protective device output is directly introduced among the PLC of drive system; As one of out-of-work logic control condition of control IEGT module, so just can get the jump on before " tripping operation " mechanical action of circuit breaker the trigger impulse of IEGT in the shielding/blockade converter plant; Realize the shutoff of IEGT; Avoid di/dt current break value to impact impact, IEGT is protected the ingenious part of present technique scheme control logic that Here it is IEGT.
Embodiment:
Adopt system shown in Figure 2, according to method shown in Figure 3, the practical implementation step of blocking the IEGT trigger impulse is following:
1, by the pulse of the output of the microcomputer protecting device on high pressure feeder line high pressure " tripping operation " control signal; In drive system, trigger through the edge; In a single day the pulse of assurance " tripping operation " control signal sends, and the intermediate variable CB_Triping Intent that drive system increases necessarily is set.
2, intermediate variable CB_Triping Intent and CB Closing, NO_CB Open signal (being provided by drive system) are through the logical functional module; Produce asserts signal together; Obtain the HV_TripIntent signal through set module (SR module), this signal can be resetted by the Reset signal.
The logic diagram of HV_Trip Intent signal is referring to Fig. 4.
3, HV_Trip Intent signal joins in the data type conversion module (B_TO_DW); Obtain the double byte variable; Variable that obtains and Fault Control effective word are carried out position and operation; Whether the result who judges its output equals 0, obtains the Fault.tripWord1 signal letters, and this signal letters contains the high-voltage trip signal, tightly stops fault-signal, circuit breaker failure, earthed switch fault, precharge fault, insulation fault, dc bus fault etc.
The logic diagram of Fault.tripWord1 signal is referring to Fig. 5.
4, by Fault.tripWord1 and other similar Fault.tripWord fault words together as the logical "or" gate input signal; Obtain fault useful signal Fault.Trip Effect on through the set module; This signal is with the input signal of other signals as the set control module; Obtain pulse blocking signal Pulse Enable, the IEGT that passes to frequency transformer control module triggers Enable Pin EnblBklge, blocks IEGT and triggers; Promptly grid-the emitter-base bandgap grading at IEGT adds reverse voltage, makes the former reverse potential barrier that forms on surface, grid P district disappear.
Pulse Enable signal logic figure is referring to Fig. 6.
Because above-mentioned accompanying drawing all adopts standard technique of painting drafting in the industry, its mark is conventional in the industry usage, and those skilled in the art can understand its implication and usage fully, so no longer narrate at this.
Because be about 60ms the operate time of primary cut-out switch, according to available data, the time of system lock IEGT trigger impulse only needs 30ms just can move, thereby the present technique scheme is fully feasible technically.
Because technical scheme of the present invention is introduced primary cut-out " tripping operation " control signal the logical triggering condition of blocking IEGT trigger impulse module; On the basis that does not influence original controlled function; Output signal according to microcomputer protecting device; The trigger impulse of IEGT in the shielding/blockade converter plant is realized the shutoff of IEGT in advance, has protected IEGT to avoid the impact of mutation current.
Simultaneously, the present technique scheme utilizes time that the signal of telecommunication realizes faster than the characteristics of mechanical action time, gets the jump on before " tripping operation " mechanical action of circuit breaker, closes the IEGT components and parts in advance, has thoroughly solved the hidden danger on the equipment.
In addition; The protection action mechanism of present technique scheme is provided with ingenious; Be easy to realize that install at the scene that can reduce the fault recovery stage, the debugging quantities, has shortened the on-site procedure for repairing required time greatly; Reduced maintenance cost and standby redundancy quantity, helped resuming production rapidly and reducing production/maintenance cost.
The present invention can be widely used in the control/protection field of rolling unit drive system.
Claims (7)
1. implementation method of protecting trip signal protection IEGT based on continuing; Comprise when load/system for field breaks down signal; Blockade IEGT trigger impulse module among the PLC of drive system, output " blockade IEGT trigger impulse " signal, the trigger impulse of IEGT in the shielding converter plant; Realize the shutoff of IEGT, IEGT is protected; It is characterized in that described implementation method of protecting trip signal protection IEGT based on continuing comprises the following steps:
A, in the PLC of drive system, block in original logical triggering condition of IEGT trigger impulse module; Increase " circuit breaker trip fault " intermediate variable, described " circuit breaker trip fault " intermediate variable and existing logical triggering condition constitute the relation of logical;
B, with circuit breaker " tripping operation " control signal output ends of microcomputer protecting device, introduce among the PLC of drive system through the I/O port;
C, when the feeder current signal of converter plant supply line during greater than the current quick-breaking setting value, microcomputer protecting device output circuit breaker " tripping operation " control signal, described circuit breaker " tripping operation " control signal is admitted among the PLC of drive system through the I/O port;
D, in the PLC of drive system, according to received circuit breaker " tripping operation " control signal, adopt the mode of edge-triggered, " circuit breaker trip fault " intermediate variable is carried out assignment, be " 1 ";
E, " circuit breaker trip fault " intermediate variable and original logical triggering condition of blocking IEGT trigger impulse module are carried out the logical computing, produce asserts signal, the logical triggering condition of blocking IEGT trigger impulse module is satisfied;
F, blockade IEGT trigger impulse module output " blockade IEGT trigger impulse " signal; The trigger impulse of IEGT in the shielding/blockade converter plant; Before " short-circuit protection ", killer switch " tripping operation " action take place the high pressure inlet wire, IEGT is implemented in off state;
G, through circuit breaker " tripping operation " control signal being introduced the logical triggering condition of blockade IEGT trigger impulse module; Together constitute the mode of blocking the new logical triggering condition of IEGT trigger impulse module with original logical triggering condition, after microcomputer protecting device output " tripping operation " control signal, by blocking IEGT trigger impulse module output " blockade IEGT trigger impulse " signal; Get the jump on before " tripping operation " mechanical action of circuit breaker; The trigger impulse of IEGT in the shielding/blockade converter plant is realized the shutoff of IEGT, and protection IEGT does not receive the impact of electric current; Avoid di/dt current break value to impact impact, IEGT is protected IEGT.
2. according to the described implementation method of protecting trip signal protection IEGT based on continuing of claim 1; It is characterized in that in the PLC of said drive system,, join in the data type conversion module " high voltage short circuit tripping operation " signal; Obtain the double byte variable; Double byte variable that obtains and Fault Control effective word are carried out position and operation, judge whether the result of its output equals 0, obtain Fault.tripWord1 fault word.
3. according to the described implementation method of protecting trip signal protection IEGT based on continuing of claim 2; It is characterized in that by described fault word Fault.tripWord1 and other original logical triggering condition fault words obtaining fault useful signal Fault.Trip Effect on through the set module together as the logical "or" gate input signal.
4. according to the described implementation method of protecting trip signal protection IEGT based on continuing of claim 3; It is characterized in that described fault useful signal Fault.Trip Effect on is with the input signal of other original logical triggering condition fault-signals as the set control module; Obtain pulse blocking signal Pulse Enable; The IEGT that pulse blocking signal Pulse Enable is passed to frequency transformer control module triggers Enable Pin EnblBklge, blocks IEGT and triggers.
5. according to the described implementation method of protecting trip signal protection IEGT based on continuing of claim 2; Whether the PLC detection failure word that it is characterized in that said drive system equals " 0 "; When the fault word equaled " 0 ", the expression system did not have fault, need not shield the trigger impulse of IEGT; When the fault word is not " 0 " or when " 1 ", show that there is fault in system, this moment, PLC made that through the set module IEGT trigger impulse is invalid, reached and blocked the IEGT functions of modules, utilized the physical property of IEGT, made it not receive the impact of high pressure.
6. according to the described implementation method of protecting trip signal protection IEGT based on continuing of claim 3; It is characterized in that described blockade IEGT triggers; Grid-emitter-base bandgap grading through at IEGT adds reverse voltage, makes the former reverse potential barrier that forms on surface, grid P district disappear, thereby realizes the shutoff of IEGT.
7. according to the described implementation method of protecting trip signal protection IEGT based on continuing of claim 1, it is characterized in that described " high voltage short circuit tripping operation " signal, can reset by " resetting " signal among the drive system PLC.
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| EP2983280A1 (en) * | 2014-08-07 | 2016-02-10 | ABB Technology AG | Power conversion device |
| CN111175570A (en) * | 2020-03-13 | 2020-05-19 | 中国工程物理研究院激光聚变研究中心 | Pulse discharge current recording device with trigger enabling function and fault identification method |
| CN113030636A (en) * | 2021-02-26 | 2021-06-25 | 国网河南省电力公司电力科学研究院 | Active intervention type arc suppression device test system |
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| CN113030636A (en) * | 2021-02-26 | 2021-06-25 | 国网河南省电力公司电力科学研究院 | Active intervention type arc suppression device test system |
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Effective date of abandoning: 20180622 |