CN202309058U - Pressure-sensitive energy consumption brake protection circuit - Google Patents
Pressure-sensitive energy consumption brake protection circuit Download PDFInfo
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- CN202309058U CN202309058U CN2011203720294U CN201120372029U CN202309058U CN 202309058 U CN202309058 U CN 202309058U CN 2011203720294 U CN2011203720294 U CN 2011203720294U CN 201120372029 U CN201120372029 U CN 201120372029U CN 202309058 U CN202309058 U CN 202309058U
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Abstract
Provided is a pressure-sensitive energy consumption brake protection circuit, characterized in that: the connecting points at two ends of an contact of an energy consumption brake contactor are provided with a pressure-sensitive resistor in parallel connection; an energy consumption brake resistor of the energy consumption brake contactor is serially connected with the circuit; and an armature of a motor in the circuit connected with the energy consumption brake contactor is connected with the circuit in parallel, thereby forming the pressure-sensitive energy consumption brake protection circuit. The utility model selects a surge inhibition type piezoresistor based on the rated voltage and rated current parameters of the to-be-protected motor to form a pressure-sensitive energy consumption brake protection circuit with an instantaneous independent closed cycle of 8-20 microsecond nanosecond. The pressure-sensitive energy consumption brake protection circuit produces no coupling operation relationship with any other operating program, and directly removes the damage to the motor follow current resulting from the inductance potential increasing with the motor amid the steel and card rolling blocking process, thereby improving security and stability of the energy consumption brake to 100 percent. The pressure-sensitive energy consumption brake protection circuit features security, reliability, reasonable design, low cost, and great functions, and is capable of reducing 80% of the device fault rate, cutting down device maintenance expenditure, raising running rate, facilitating the protection measures, and prolonging the service lifetime of a motor.
Description
Technical field
The utility model relates to the dynamic braking protective circuit in the automatic control system main transmission circuit, particularly a kind of pressure-sensitive dynamic braking protective circuit.
Technical background
Motor is industrial power core.Because the quickening of production status and rhythm of production; Under the situation such as steel mill electric machine is clapped emergency shutdown or stall, skidded in the operation of rolling of high rotating speed high capacity, motor overload tripping operation; At this moment rolling system changes because of the step load that bears impact or anticlimax; Make some part produce the load of 4～7 times of rated moments, caused the damage of some mechanical part.Substantially exceeded the overload capacity of design of electrical motor, (back electromotive force-Ee) to the afterflow of motor, impact the insulating barrier of motor threatens safe operation to have produced higher " surge " inductance electromotive force.Produced bigger influence the useful life to motor, is worth very much research and improves.In order to try to achieve stable running and long useful life, should strengthen technical regulation and optimize protective circuit.
As shown in Figure 1; Direct current machine brush and commutator are network components; Because the influence of supply harmonic, the smoothing reactor in the large-scale dc motor main circuit system has played indispensable important function, is one and reduces to pulse and improve the important measures of switching-over.In the circuit of the big-and-middle-sized direct current machine of part, then ignored smoothing reactor in order to reduce cost; The current of commutation is all the time with the pulsation spark; Performance is particularly outstanding when the main driving motor high capacity of steel rolling; Especially the higher inductance electromotive force that when emergency shutdown or stall, produces has aggravated the damage to commutator, can form vicious circle.Produced and to have estimated true influence.
Renewal and industrial upgrading control system along with equipment realized full-automatic digital control in the last few years; But dynamic braking is to arrive to program control with system protection element and hardware detection to carry out components and parts again; Auxiliary relay drives the energy consumption contactor and is connected to brake resistance, realizes dynamic braking.The regenerative braking controllable silicon will be through system's forward by counter-rotating triggering again; These operations detect the conversion through components and parts through system again; Generally want several milliseconds to tens milliseconds times, this process control has strengthened the motor inductance electromotive force (climbing of back-emf-Ee) virtually.
Hot-rolling mill is different with cold-rolling mill, and the cold-rolling mill load is more level and smooth, and the impulse current of hot-rolling mill is bigger, faults such as emergency shutdown stall tripping operation often occur, and the burn commutator is inevitable.Be homemade now or the dynamic braking mode of the main transmission of external import all is this process control like Fig. 1.Powerful surge inductance electromotive force (back electromotive force) maximum can reach specified 1.5-3 doubly when high rotating speed, high capacity emergency shutdown or stall.Its protection system all will be passed through system protection and is transferred to the dynamic braking contactor again to auxiliary relay again to the program control tripping operation.This process control; The peak value of the maximum surge inductance electromotive force that motor produces rises at random; Rotating speed is high more, load is bigger, the inductance electromotive force is strong more, and climbing is uncontrollable, therefore when clapping the tripping operation of emergency shutdown or stall through the point discharge of the commutator of being everlasting; Burn or puncture insulating barrier, form vicious circle.
Cause unnecessary loss and higher maintenance penalty to production.Directly affect and produce or cause stopping and destroying of activity in production.
Handling this fault quite bothers; The needs that fault is serious are changed motor and are wanted tens hours to tens hours; The online treatment commutator that fault is light is wanted 2-4 hour, and advanced at present way is to adopt the commutator of special isolation soft grinding stone (non-ferrous metal grinding stone) lapping burn of the desirable company of the import U.S..The useful life that has not only increased cost but also reduced motor.Taking place frequently of fault is very big to ordinary production and lumber recovery, product percent of pass influence, and therefore its optimal control being eliminated it, to influence meaning extremely great.
Summary of the invention
For realizing above-mentioned purpose; The technical scheme that the utility model adopts provides a kind of pressure-sensitive dynamic braking protective circuit; This circuit structure includes the circuit that connects the dynamic braking contactor; Wherein: piezo-resistance is installed in parallel connection additional on the tie point at the two ends, contact of said dynamic braking contactor, and connects with the dynamic braking resistance of dynamic braking contactor, again with the circuit that is connected the dynamic braking contactor in the armature of motor be connected in parallel into pressure-sensitive dynamic braking protective circuit.
The effect of the utility model is the energy-dissipating brake circuit that piezo-resistance is incorporated in motor; The major technique characteristics are to adopt the semi-conductive pressure-sensitive R-C energy consumption of RV piezo-resistance circuit to realize the quantified controlling mode; Through-flow in the time of 8-20 μ s nanosecond embedding pressure, be discharged into the parallelly connected pressure-sensitive dynamic braking protective circuit that forms an instantaneous independent closed cycle with armature on the dynamic braking resistor.Be ahead of system's control and directly controlled the climbing of motor surge electromotive force, overcome the deficiency on the prior art, utilize its sensitiveness, improved rapidity and reliability, reduced of the impact of surge inductance electromotive force electrical machine insulation.The circuit design of the utility model is reasonable, safe and reliable, simple to be suitable for, and the low effect of cost is big, is applicable to the improvement and the raising of China's current industrial driving motor energy-dissipating brake circuit.Particularly can reduce failure rate 80%, reduce equipment maintenance cost, improve running rate, to optimizing protective circuit, the useful life of improving safeguard measure prolongation motor is significant, in commercial production, can produce considerable economic.
Description of drawings
Fig. 1 is original steel rolling main transmission control system main circuit diagram;
Fig. 2 is the protective circuit main transmission control system main circuit diagram of the utility model;
Fig. 3 is a steel rolling main transmission operating system Automatic Control sketch.
Among the figure:
M, direct current machine SpdM, system control panel K01.1SpdM, system control panel internal relay S10.1, emergency shutdown button K04.1, auxiliary relay Q02.1, high-speed switch circuit breaker K45.1, dynamic braking contactor R1, dynamic braking resistor R V, varistor Q10.1, interconnection switch 850V DC, main transmission thyristorized supply power supply V.Transd, voltage transformation plate
Embodiment
Below in conjunction with accompanying drawing the pressure-sensitive dynamic braking protective circuit of the utility model is elaborated.
The pressure-sensitive dynamic braking protective circuit design philosophy of the utility model is on the basis of original system energy consumption braking like Fig. 1 circuit, to be optimized; Be connected in the piezo-resistance apparatus two ends of dynamic braking contacts of contactor in parallel, be connected in series in direct current machine with dynamic braking resistance again like Fig. 2.Adopt parallelly connected with the direct current machine again mode of series connection energy consumption brake resistance; The braking protective circuit that absorbs and be discharged into dynamic braking resistance is pressed in the embedding that forms R-C; Realizing quantizing dynamic braking, is a kind of pressure-sensitive dynamic braking protective circuit of a high-performance quantum dot energy consumption inductance electromotive force energy.
The pressure-sensitive dynamic braking protective circuit of the utility model; This circuit structure includes the circuit that connects the dynamic braking contactor; Piezo-resistance is installed in parallel connection additional on the tie point at the two ends, contact of said dynamic braking contactor; And connect with the dynamic braking resistance of dynamic braking contactor, again with the circuit that is connected the dynamic braking contactor in the armature of motor be connected in parallel into pressure-sensitive dynamic braking protective circuit.The pressure-sensitive dynamic braking protective circuit of promptly forming R-C.
Said piezo-resistance is one or more pairs of piezo-resistances that are connected in parallel, and said piezo-resistance RV is commercially available surge inhibition type varistor, is semi-conductive electric component.
The RV varistor is the rated voltage according to the direct current machine of being protected in the said pressure-sensitive dynamic braking protective circuit, rated power nominal varistor voltage Vs that to be major parameter obtain through the meticulous calculating of strictness and discharge capacity (8-20 μ s/KA) and by its requirement at the surge inhibition type RV of the special manufacturing of professional manufactory varistor.
Said pressure-sensitive dynamic braking protective circuit; The selected varistor of reserving is minimum one or more pairs of being in parallel installed with in the box of qualified insulation is arranged, the rubber-insulated flexible cable that two ends are connected with High-Voltage Insulation again with the tie point of dynamic braking contactor two terminal contacts on the parallelly connected pressure-sensitive dynamic braking protective circuit that becomes of connecting again with dynamic braking resistance that is connected in parallel with the armature of motor.
Said employing surge inhibition type piezo-resistance is the characteristic with the pressure sensitive voltage Vs transient absorption surge inductance energy of voltage dependent resistor device institute definite value nominal.The process control 8-12 millisecond time that surmounts system with the through-flow ON time of 8-20 μ s nanosecond; Has the hyperthread response speed; Embedding presses the good infiltration rate of characteristic fast; Form R-C coupling absorption energy and be discharged into the ohmically circuit of dynamic braking, control the motor braking state timely and effectively because of the systematic procedure control surge inductance electromotive force that duration rose, i.e. back electromotive force-Ee.Realize the climbing of quantified controlling surge inductance electromotive force with the effect of " opening different locks with different keys ", avoid the impulsive discharge puncture short of commutator for electric motor and winding insulation such as is blown out at the generation and the infringement of afterflow accident.
Said surge inhibition type varistor is meant the varistor that is used to suppress transient overvoltages such as lightning overvoltage and switching overvoltage, the appearance of this transient overvoltage be at random, aperiodic, the peak value of current/voltage maybe be very big.Be puncture voltage or threshold voltage.The magnitude of voltage of finger under rated current, the magnitude of voltage that records when in most cases feeding varistor with the 1mA direct current, the pressure sensitive voltage scope of its product can not wait from 10-9000V.Can be according to concrete needs right selection.
Pressure-sensitive dynamic braking protective circuit as shown in Figure 2 is the K45 in Fig. 1
.Varistor is installed in parallel connection additional on the tie point at 1 dynamic braking contacts of contactor two ends, constitutes according to rated voltage, the selected surge inhibition of the rated power parameter type RV varistor of native system motor, becomes pressure-sensitive dynamic braking protective circuit.
When motor under the operating mode of high rotating speed high capacity emergency shutdown or stall; Promptly produce very high electrical surge inductance electromotive force (back electromotive force-Ee); When inductance electromotive force when moment reaches the nominal varistor voltage Vs of varistor at random, 8-20 μ s/2-50KA through-current capacity/0.01-9KV pressure sensitive voltage, the resistance of piezo-resistance drops to zero rapidly; Embedding is pressed the conducting peak current to absorb surge inductance electromotive force energy it is discharged on the dynamic braking resistor (load), changes heat exhaustion into totally.
Described surge inhibition type piezo-resistance is infinitely great when nominal varistor voltage Vs is following when rated operational voltage, is regarded as open-circuit condition, does not influence the normal running system of Fig. 1, but the normal running ordinary production.Lower inductance electromotive force was depleted on the dynamic braking resistance when normal running was shut down, and piezo-resistance is infinite very much not conducting.When bat suddenly stops brake hard or stall; The powerful surge inductance electromotive force that produces at random; Be back electromotive force-Ee when reaching pressure sensitive voltage Vs value, the resistance of piezo-resistance drops to zero embedding at once and presses through-flowly, promptly plays the gate valve effect; Reveal conducting, inductance energy consumes on the dynamic braking resistor the pressure-sensitive dynamic braking protective circuit that forms an instantaneous independent closed cycle with armature at once in the time of 8-20 μ s nanosecond.Directly solved the infringement of the inductance electromotive force that rises at random to the motor afterflow.
As shown in Figure 3, in the operating mode that rated voltage does not have emergency shutdown or stall to suddenly change, be still the mode of operation of the constant normal dynamic braking of Fig. 1.
But the pressure-sensitive dynamic braking protective circuit comparison of analytical system operating process control energy-dissipating brake circuit and the utility model and the operative relationship of coupling from Fig. 3.Discrimination ratio is than the superior function of its operating time and quantified controlling surge inductance electromotive force.
1, motor receives the electricity operation:
Work as high powered, the main transmission silicon controlled rectification power source is rated voltage 850V, and operating power is 220V; Selecting hsb to close a floodgate opens soon; High-speed switch circuit breaker Q 02.1 is closed a floodgate, i.e. SpdM system control panel internal relay K01.1 receives electricity, and SpdM system control panel internal relay K01.1 auxiliary magnet is closed; Normally closed point through emergency shutdown button S10.1 receives to auxiliary relay K04.1; The auxiliary crawl of auxiliary relay K04.1 closes, for the hold-in winding of high-speed switch circuit breaker Q 02.1 receives electricity, fast folding lock.The auxiliary normally closed crawl of high-speed switch circuit breaker Q 02.1 is disconnected simultaneously, impels dynamic braking contactor K45.1 outage moving disconnected, and fast folding lock is ready to.Prepare to select manually or automatically, manually crawl or give automatic given starting operation.
When direct current machine M ran well with rated voltage, voltage was lower than the Vs pressure sensitive voltage value of piezo-resistance, and this moment, the resistance of piezo-resistance was high, near open circuit, therefore can not influence the operate as normal of original system circuit and the normal running of former energy consumption braking circuit.
The state that surge and transition are arranged when unusual emergency shutdown or stall appear in direct current machine M; Be that (back electromotive force-Ee) reaches the pressure sensitive voltage Vs embedding of piezo-resistance and presses through-flow value surge inductance electromotive force; Nominal: surge current Ipm/ surge voltage Vpm; Promptly, absorb peak current inductance electromotive force and be discharged on the dynamic braking resistor with the time exceeding system protection time of 8-20 μ s nanosecond.The auxiliary crawl of SpdM system control panel internal relay K01.1 decompression outage is disconnected simultaneously; Impel the auxiliary crawl of auxiliary relay K04.1 outage disconnected; The hold-in winding decompression outage tripping operation that impels high-speed switch circuit breaker Q 02.1 to open soon; The auxiliary normally closed crawl of high-speed switch circuit breaker Q 02.1 closes simultaneously, and dynamic braking contactor K45.1 receives electronic closing, and realizes dynamic braking again.As shown in Figure 1.
2, orderly closedown:
When pressing (auto) orderly closedown button; Through PLC instruction SpdM system, i.e. the auxiliary crawl of SpdM system control panel internal relay K01.1 decompression is disconnected, and the auxiliary crawl of auxiliary relay K04.1 decompression is disconnected; Impel the hold-in winding of high-speed switch circuit breaker Q 02.1 to open the moving disconnected tripping operation of decompression soon; The auxiliary normally closed crawl of high-speed switch circuit breaker Q 02.1 closes and impels dynamic braking contactor K45.1 to receive electronic closing simultaneously, through dynamic braking resistor R 1, realizes dynamic braking.As shown in Figure 1.
3, overvoltage:
When supply voltage be higher than 850V DC 120% the time, V.Transd is detected by system control panel SpdM through the voltage transformation plate, promptly the auxiliary crawl of SpdM internal system relay K 01.1 decompression is disconnected; The auxiliary crawl of auxiliary relay K04.1 decompression is disconnected; Impel the hold-in winding of high-speed switch circuit breaker Q 02.1 to open soon, the moving disconnected tripping operation of decompression, the auxiliary normally closed crawl of high-speed switch circuit breaker Q 02.1 closes simultaneously; Dynamic braking contactor K45.1 receives electronic closing through dynamic braking resistor R 1, realizes dynamic braking.As shown in Figure 1.
4, clapping emergency shutdown button S10.1 shuts down:
When clapping emergency shutdown button S10.1, the auxiliary crawl of auxiliary relay K04.1 decompression is disconnected, impels the hold-in winding of high-speed switch circuit breaker Q 02.1 to open the moving disconnected tripping operation of decompression soon.The auxiliary normally closed crawl of high-speed switch circuit breaker Q 02.1 closes simultaneously, and dynamic braking contactor K45.1 receives electronic closing through dynamic braking resistor R 1, realizes dynamic braking, the 5-10 millisecond.As shown in Figure 1.
5, stall is shut down:
As direct current machine M during at high rotating speed, high capacity stall, the tachogenerator that connects main shaft is that the pulse generator prompt drop is 0, and negative feedback is 0; Be that comparative voltage in the system, control such as given get into guard mode, the auxiliary crawl of promptly inner SpdM internal system relay K 01.1 decompression is disconnected, and the auxiliary crawl of auxiliary relay K04.1 decompression is disconnected; Impel the hold-in winding of high-speed switch circuit breaker Q 02.1 to open soon; The moving disconnected tripping operation of decompression, the auxiliary normally closed crawl of high-speed switch circuit breaker Q 02.1 closes simultaneously, and dynamic braking contactor K45.1 receives electronic closing through dynamic braking resistor R 1; Realize dynamic braking, need the 8-12 millisecond.
The parameter transition of simultaneity factor, is fed back to 0 at rotating speed, and the controllable silicon forward triggers and ends, and counter-rotating triggers, and realizes feedback again.As shown in Figure 1.
The pressure-sensitive dynamic braking protective circuit of the utility model does not influence the every operation performance like Fig. 1 primary circuit.Still normal running of system when no matter being normal operation, orderly closedown, emergency shutdown or stall.
The pressure-sensitive dynamic braking protective circuit of said the utility model is the R-C coupling circuit.Be to press through-flow peak current to absorb surge inductance electromotive force according to the pressure sensitive voltage Vs embedding of piezo-resistance it is discharged into the service behaviour on the dynamic braking resistance R 1.
Characteristic with the nominal varistor voltage Vs transient absorption surge inductance energy of voltage dependent resistor device institute definite value.The process control 6-12 millisecond time that surmounts system with the through-flow ON time of 8-20 μ s nanosecond; Has the hyperthread response speed; Embedding presses the good infiltration rate of characteristic fast; Form the R-C coupling and absorb energy and be discharged into the ohmically circuit of dynamic braking, (climbing of back electromotive force-Ee) produces high pressure to control the surge inductance electromotive force that the motor braking state rises with load because of systematic procedure control timely and effectively.Realize the climbing of quantified controlling surge inductance electromotive force with the effect of " opening different locks with different keys ".Avoid the impulsive discharge puncture short of engine commutator and winding insulation layer such as is blown out at the generation of accident.
(back electromotive force-when Ee) reaching the pressure sensitive voltage Vs of piezo-resistance, the resistance of piezo-resistance drops to zero to the powerful surge inductance electromotive force that under the operating mode of high rotating speed high capacity, produces at random when emergency shutdown or stall at once, plays the gate valve effect.Press the conducting peak current to absorb surge inductance electromotive force energy in the time of 8-20 μ s nanosecond embedding and it is discharged in the load of dynamic braking resistor R 1, form the pressure-sensitive dynamic braking protective circuit of an instantaneous independent closed cycle with armature.Do not produce any coupling operative relationship with other operation sequences of system, directly solved the infringement of the surge inductance electromotive force that rises at random, make the fail safe of its dynamic braking and stability reach 100% the motor afterflow.
Claims (3)
1. pressure-sensitive dynamic braking protective circuit; This circuit structure includes the circuit that connects the dynamic braking contactor; It is characterized in that: piezo-resistance is installed in parallel connection additional on the tie point at the two ends, contact of said dynamic braking contactor; And connect with the dynamic braking resistance of dynamic braking contactor, again with the circuit that is connected the dynamic braking contactor in the armature of motor be connected in parallel into pressure-sensitive dynamic braking protective circuit.
2. pressure-sensitive dynamic braking protective circuit according to claim 1 is characterized in that: said piezo-resistance is a surge inhibition type varistor.
3. according to the said pressure-sensitive dynamic braking protective circuit of claim 1, it is characterized in that: said piezo-resistance is one or more pairs of piezo-resistances that are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203720294U CN202309058U (en) | 2011-09-28 | 2011-09-28 | Pressure-sensitive energy consumption brake protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203720294U CN202309058U (en) | 2011-09-28 | 2011-09-28 | Pressure-sensitive energy consumption brake protection circuit |
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| CN202309058U true CN202309058U (en) | 2012-07-04 |
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| CN2011203720294U Expired - Lifetime CN202309058U (en) | 2011-09-28 | 2011-09-28 | Pressure-sensitive energy consumption brake protection circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682792A (en) * | 2013-11-27 | 2015-06-03 | 德昌电机(深圳)有限公司 | Direct current motor control circuit |
| WO2015127710A1 (en) * | 2014-02-26 | 2015-09-03 | 上虞市冠业电器有限公司 | Current-limiting protection circuit of direct-current motor |
| CN106089013A (en) * | 2016-08-03 | 2016-11-09 | 崔晓哲 | Australia's formula rolling screen door fast acting control system and control method |
| CN108462142A (en) * | 2018-03-01 | 2018-08-28 | 英孚康（浙江）工业技术有限公司 | A kind of servo-driver dynamic braking thermal overload protection method |
| CN112332711A (en) * | 2020-11-24 | 2021-02-05 | 西北机电工程研究所 | Method for configuring follow-up short-circuit brake resistor of gun |
-
2011
- 2011-09-28 CN CN2011203720294U patent/CN202309058U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682792A (en) * | 2013-11-27 | 2015-06-03 | 德昌电机(深圳)有限公司 | Direct current motor control circuit |
| CN104682792B (en) * | 2013-11-27 | 2020-01-31 | 德昌电机(深圳)有限公司 | Direct current motor control circuit |
| WO2015127710A1 (en) * | 2014-02-26 | 2015-09-03 | 上虞市冠业电器有限公司 | Current-limiting protection circuit of direct-current motor |
| CN106089013A (en) * | 2016-08-03 | 2016-11-09 | 崔晓哲 | Australia's formula rolling screen door fast acting control system and control method |
| CN108462142A (en) * | 2018-03-01 | 2018-08-28 | 英孚康（浙江）工业技术有限公司 | A kind of servo-driver dynamic braking thermal overload protection method |
| CN108462142B (en) * | 2018-03-01 | 2019-06-21 | 英孚康（浙江）工业技术有限公司 | A kind of servo-driver dynamic braking thermal overload protection method |
| CN112332711A (en) * | 2020-11-24 | 2021-02-05 | 西北机电工程研究所 | Method for configuring follow-up short-circuit brake resistor of gun |
| CN112332711B (en) * | 2020-11-24 | 2023-02-21 | 西北机电工程研究所 | Method for configuring follow-up short-circuit brake resistor of gun |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190618 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee before: Tianjin Steel Pipe Group Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |
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| CX01 | Expiry of patent term |