CN104485143A - Processing method and system of nuclear power plant distributed control system - Google Patents
Processing method and system of nuclear power plant distributed control system Download PDFInfo
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- CN104485143A CN104485143A CN201410642692.XA CN201410642692A CN104485143A CN 104485143 A CN104485143 A CN 104485143A CN 201410642692 A CN201410642692 A CN 201410642692A CN 104485143 A CN104485143 A CN 104485143A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
- G21D3/06—Safety arrangements responsive to faults within the plant
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
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Abstract
The invention belongs to the nuclear power plant instrument control field and provides a processing method and system of a nuclear power plant distributed control system. The method includes the following steps that: information transmitted by a current acquisition and processing board is received, wherein the information includes ranging codes of first current signals and significance bits of the current acquisition and processing board; whether the current acquisition and processing board is in a ranging switching state is judged according to the received information; and when the current acquisition and processing board is in the ranging switching state, delay time for transmitting second current signals to anticipated transients without trip (ATWT) protection is determined according to the received information which is transmitted by the current acquisition and processing board, wherein the second current signals are determined according to the ranging codes and analog quantity of the first current signals. With the processing method and system provided by the embodiment of the invention, the probability of misoperation of the ATWT protection can be decreased.
Description
Technical field
The invention belongs to nuclear power plant instrument control field, particularly relate to a kind of disposal route and system of nuclear power station scattered control system.
Background technology
At present, the middle range of the digital processing system that ridge Australia second phase Nuclear Instrument measuring system (RPN system) uses is applied to reactor capability at 1E-6%FP to 100%FP platform, the current signal of process is 1E-11A to 1E-3A, spans 8 magnitudes.In order to ensure the degree of accuracy of measuring-signal and transmission, adopting current acquisition disposable plates to be divided into two parts to transmit the current signal of middle range, supposing that the expression formula of this current signal is I=A*10
b, A represents the analog quantity in selected range ability, and current signal is 0-1mA; B represents range coding (belonging to the switching value of current signal), uses the digital quantity of triad code character synthesis to represent measurement range selection, such as, adopts " 001 " to represent first range, adopts " 010 " to represent second range.
In order to ensure the correctness that range coding switches and transmits, the current acquisition disposable plates of use have also been devised " parity check bit " and carries out parity checking, to guarantee the correctness of range coding transmission.In addition, this current acquisition disposable plates is also designed with " significance bit " (belonging to the switching value of current signal), for when this current acquisition disposable plates carries out range blocked operation, export a falling pulse instantaneously, as the block signal of this current acquisition disposable plates.
As shown in Figure 1, at anticipated transient (the Anticipated Transientswithout Trip failing emergency shut-down of ridge Australia second phase, ATWT) in relay protective scheme, the current signal of middle range is sent to TXP system by RPN rack (being provided with I &C equipment in rack), and (this TXP system is the TELEPERM XP scattered control system that Siemens Company releases, this TXP system comprises ATWT protection), this TXP system acceptance is to analog quantity A, Current calculation is carried out after three range coding B and parity check code, and the result calculated directly is exported, to participate in ATWT relay protective scheme.
But due in data handling procedure; the plate of the analog quantity of process current signal is different with the plate of the switching value of process current signal; its response time is different (normally first collect on-off model and collect analog signals again) also; therefore the current signal calculated according to the analog quantity of current signal and the switching value of current signal is caused to occur mistake; thus the unusual fluctuations of current signal may be there are; if the current signal of unusual fluctuations is issued to ATWT protection, the risk starting ATWT protection misoperation will be increased.And this possibility is also confirmed during overhaul start and stop: during repeatedly overhaul start and stop; all can be observed the phenomenon of peak current disturbance; as; current value may suddenly change to 0.65mA from 0.1mA; and when the setting value of peak current more than ATWT, will directly trigger the protection act of ATWT.
Summary of the invention
Embodiments provide a kind of disposal route of nuclear power station scattered control system, be intended to solve existing method when carrying out range and switching, the current signal of unusual fluctuations be issued to ATWT protection, thus increase the problem of the risk of ATWT protection misoperation.
The embodiment of the present invention is achieved in that a kind of disposal route of nuclear power station scattered control system, and described method comprises the steps:
The information that received current acquisition process plate sends; Described information comprises the range coding of the first current signal and the significance bit of current acquisition disposable plates;
Information according to receiving judges whether current acquisition disposable plates is in range switching state;
When described current acquisition disposable plates is in range switching state, determine to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the information received, described second current signal is determined according to the range coding of described first current signal and analog quantity;
Select whether send the second current signal according to the delay time determined to protect to ATWT.
Another object of the embodiment of the present invention is the disposal system providing a kind of nuclear power station scattered control system, and described system comprises:
Information receiving unit, for the information that received current acquisition process plate sends; Described information comprises the range coding of the first current signal and the significance bit of current acquisition disposable plates;
Range switching state judging unit, the information for receiving according to described information receiving unit judges whether current acquisition disposable plates is in range switching state;
Electric current delay time determining unit, for when described current acquisition disposable plates is in range switching state, the information received according to described information receiving unit determines to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects, and described second current signal is determined according to the range coding of described first current signal and analog quantity;
Current output unit, the delay time for determining according to described electric current delay time determining unit is selected whether send the second current signal and is protected to ATWT.
In embodiments of the present invention, due to send the second current signal to fail emergency shut-down anticipated transient ATWT protect time perform delay operation, therefore TXP system is made to have time enough, obtain the range coding and analog quantity that belong to same current signal, and recalculate current signal according to the range coding belonging to same current signal obtained and analog quantity, avoid and adopt the range of upper current signal coding to calculate with the analog quantity of this current signal the situation causing the current signal calculated to be made mistakes, thus make the current signal exporting ATWT protection to be unusual fluctuations do not occur, reduce the probability that misoperation occurs in ATWT protection.
Accompanying drawing explanation
Fig. 1 is that a kind of RPN that existing method provides sends the schematic diagram of current signal to TXP system;
Fig. 2 is the process flow diagram of the disposal route of a kind of nuclear power station scattered control system that first embodiment of the invention provides;
Fig. 3 is that a kind of nuclear power station RPN that first embodiment of the invention provides sends the schematic diagram of current signal to TXP system;
Fig. 4 is the structural drawing of the disposal system of a kind of nuclear power station scattered control system that second embodiment of the invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
In the embodiment of the present invention; the information that received current acquisition process plate sends; judge whether current acquisition disposable plates is in range switching state according to the information received again; when described current acquisition disposable plates is in range switching state; determining to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the information received, finally selecting whether send the second current signal according to the delay time determined and protecting to ATWT.
In order to technical solutions according to the invention are described, be described below by specific embodiment.
embodiment one:
Fig. 2 shows the process flow diagram of the disposal route of a kind of nuclear power station scattered control system that first embodiment of the invention provides; in the embodiment of the present invention; current signal is divided into analog quantity and switching value to be transferred to TXP system (scattered control system) by the current acquisition disposable plates of RPN rack; this TXP system calculates corresponding current signal according to the analog quantity received and switching value again, and selects according to the delay time determined the time current signal calculated being sent to ATWT protection.Wherein, " first current signal " of the embodiment of the present invention refers to the signal that current acquisition disposable plates exports, " the second current signal " refers to the current signal that TXP system-computed obtains, and " second " in " first " and " the second current signal " in " the first current signal " is only for distinguishing two different current signals, there is no the implications such as priority, details are as follows:
Step S21, the information that received current acquisition process plate sends; Described information comprises the range coding of the first current signal and the significance bit of current acquisition disposable plates.
In this step, the first current signal of middle range is divided into two parts to transfer to TXP system by current acquisition disposable plates, specifically corresponding according to the composition expression formula transmission of the first current signal data.Above-mentioned current acquisition disposable plates has multiple range.Wherein, the composition expression formula of the first current signal is I=A*10
b, A represents the analog quantity in selected range ability, and current signal is 0-1mA; B represents range coding (belonging to the switching value of current signal).In addition, signal corresponding to the parity check bit of this current acquisition disposable plates, significance bit is also sent to TXP system by current acquisition disposable plates, to guarantee that range coding switches and the correctness of transmission.
Step S22, the information according to receiving judges whether current acquisition disposable plates is in range switching state.
In this step, can judge whether current acquisition disposable plates is in range switching state according to the significance bit of current acquisition disposable plates, or, judge whether current acquisition disposable plates is in range switching state according to the range coding that current signal comprises.
As a preferred embodiment, when judging that range switches according to the significance bit of current acquisition disposable plates, the described current signal according to receiving judges that the step whether current acquisition disposable plates is in range switching state specifically comprises:
A1, gather value corresponding to the significance bit of described current acquisition disposable plates.In this step, the value of the significance bit of collection is likely 1 also may be 0.
A2, judge whether value corresponding to the significance bit of described current acquisition disposable plates that gathers is 0.When current acquisition disposable plates is during range switches, the value of significance bit is " 0 "; After current acquisition disposable plates completes range switching, the value of significance bit reverts to " 1 ".Therefore in this A2 step, by judging that whether the numerical value of A1 step collection be 0 to judge whether current acquisition disposable plates is in range switching state.
A3, when the value that the significance bit of described current acquisition disposable plates is corresponding is 0, judge that described current acquisition disposable plates is in range switching state, otherwise, judge that described current acquisition disposable plates is in non-range switching state.
As another preferred embodiment, when judging that range switches according to the range coding in current signal, the described information according to reception judges that the step whether current acquisition disposable plates is in range switching state specifically comprises:
B1, the range coding gathered in described current signal.Wherein, the range coding in current signal adopts triad code composition, and each combines a kind of range of unique corresponding current acquisition process plate.
B2, by the range coding gathered and the range encoding ratio stored comparatively, and the numerical value of arbitrary in the range coding gathered encode from the range of storage in the numerical value of corresponding position different time, judge that described current acquisition disposable plates is in range switching state.Wherein, the range of storage is encoded to the range coding in the last current signal received.When receiving current signal, the range of this current signal coding is encoded with the range of the last current signal received and compares, if exist in this range coding one different with the range corresponding position of encoding of last time, then Cutoff current acquisition process plate is in range switching state, otherwise current acquisition disposable plates is in non-range switching state.Such as, suppose that last range is encoded to 001, this range is encoded to 011, then due to this range coding the 2nd be " 1 ", different from the 2nd " 0 " that the range of last time is encoded, therefore, Cutoff current acquisition process plate is in range switching state.
Step S23; when described current acquisition disposable plates is in range switching state; determine to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the information received, described second current signal is determined according to the range coding of described first current signal and analog quantity.
In this step, the second current signal be according to receive the first current signal range coding and analog quantity determine, specifically still adopt above-mentioned formula to determine: I=A*10
b, A represents the analog quantity in selected range ability, and B represents that range is encoded.
Wherein, described when described current acquisition disposable plates is in range switching state, determine to send the second current signal according to the information received and specifically comprise to failing the step of delay time that the anticipated transient ATWT of emergency shut-down protects:
C1, judge the range that described current acquisition disposable plates is residing after range switches.In this step, due to a unique corresponding a kind of range of range coding, therefore, this step can judge according to range coding the range that current acquisition disposable plates is residing after range switches.
C2, obtain duration of significance bit corresponding to described current acquisition disposable plates range residing after range switches.Because the duration of significance bit corresponding to each range is usually different, therefore, after determining the range residing for current acquisition disposable plates is after range switches, the duration of the significance bit of range after this switching can just be obtained.Wherein, the duration of significance bit refers to, significance bit is continuously the time of 0, and when this significance bit is 0, ATWT protection does not have the input of current signal.Table 1 lists the duration of current acquisition disposable plates in the significance bit of 7 ranges:
Table 1:
Wherein, " s " expression " second ", " ms " expression " millisecond ".Certainly, table 1 only lists the duration of a kind of current acquisition disposable plates in the significance bit of 7 ranges, in a practical situation, when the model of current acquisition disposable plates is different, it may have different ranges, also may there is the duration of different significance bits to identical range, be not construed as limiting herein.
C3, determine to send the second current signal according to the duration of significance bit obtained and default delay component to failing the delay time that the anticipated transient ATWT of emergency shut-down protects.Particularly, the second current signal is sent to the time of ATWT by arranging multiple delay circuit by time delay, then sends block signal realization by the delay circuit arranged.As shown in Figure 3, a kind of RPN that this Fig. 3 shows first embodiment of the invention to be provided sends the schematic diagram of current signal to TXP system, and wherein, the latching logic of Fig. 3 comprises at least one delay circuit.In this step C3, suppose that the range after switching is the 1st range 10 of table 1
-9the time that the significance bit of the 1st range is continuously 0 is 4s ± 500ms, because 4s ± 500ms is longer, therefore; preset delay component can be set to 1s, namely send the second current signal to fail emergency shut-down anticipated transient ATWT protect delay time be 5s ± 500ms.Certainly, above-mentioned default delay component 1 second is only an example value, in a practical situation, also can perform the operation of time delay other times, as 1.5s, 2s etc., be not construed as limiting herein.Suppose that the range after switching is the 4th range 10 of table 1
-6, the duration of the significance bit of the 4th range is 10.5ms ± 7ms, then preset delay component can be set to 300ms, namely send the second current signal to fail emergency shut-down anticipated transient ATWT protect delay time be 310.5ms ± 7ms.Certainly, above-mentioned 300ms is only an example value, in a practical situation, also can perform the operation of time delay other times to the current signal received, as 0.5s, 0.6s etc., be not construed as limiting herein.
Preferably, send the second current signal described in and be more than or equal to the software processing cycle of TXP system to failing the delay time that the anticipated transient ATWT of emergency shut-down protects.Such as; suppose that the software processing cycle of TXP system is 200ms; then preferably; send the delay time that the second current signal protects to ATWT and can be taken as 300ms; like this; even if the cycle of signals collecting is when existing a positive and negative deviation, also can guarantee that the actual time delay time can be more than or equal to 200ms.Certainly; the software processing cycle of TXP system also may be 100ms; other values such as 400ms; should according to actual conditions; make to send the second current signal and be more than or equal to the software processing cycle (other values such as 100ms, 400ms) of this TXP system to failing delay time that the anticipated transient ATWT of emergency shut-down protects.
Step S24, selects whether send the second current signal according to the delay time determined and protects to ATWT.
In this step, the second current signal, when delay time arrives, is issued to ATWT protection, when delay time does not arrive, locks the second current signal by TXP system, in order to avoid the second current signal is issued to ATWT protection, causes the error starting that ATWT protects.In addition, when range switches, owing to having locked this second current signal, then the current signal being issued to ATWT protection has been the second current signal determined before range switches.
In the first embodiment of the invention; the information that received current acquisition process plate sends; judge whether current acquisition disposable plates is in range switching state according to the information received again; when described current acquisition disposable plates is in range switching state; determining to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the information received, finally selecting whether send the second current signal according to the delay time determined and protecting to ATWT.Due to send the second current signal to fail emergency shut-down anticipated transient ATWT protect time perform delay operation, therefore TXP system is made to have time enough, obtain the range coding and analog quantity that belong to same current signal, and recalculate current signal according to the range coding belonging to same current signal obtained and analog quantity, avoid and adopt the range of upper current signal coding to calculate with the analog quantity of this current signal the situation causing the current signal calculated to be made mistakes, thus make the current signal exporting ATWT protection to be unusual fluctuations do not occur, reduce the probability that misoperation occurs in ATWT protection.
embodiment two:
Fig. 4 shows the structural drawing of the disposal system of a kind of nuclear power station scattered control system that second embodiment of the invention provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention.
The disposal system of described nuclear power station scattered control system comprises: information receiving unit 41, range switching state judging unit 42, electric current delay time determining unit 43, current output unit 44.Wherein:
Information receiving unit 41, for the information that received current acquisition process plate sends; Described information comprises the range coding of the first current signal and the significance bit of current acquisition disposable plates.
Wherein, the current signal that current acquisition disposable plates sends comprises analog quantity and range and to encode two parts, and this current acquisition disposable plates has multiple range.In addition, signal corresponding to the parity check bit of this current acquisition disposable plates, significance bit is also sent to TXP system by current acquisition disposable plates, to guarantee that range coding switches and the correctness of transmission.
Range switching state judging unit 42, the information for receiving according to described information receiving unit judges whether current acquisition disposable plates is in range switching state.
As a preferred embodiment, described range switching state judging unit 42 comprises:
Significance bit acquisition module, the value that the significance bit for gathering described current acquisition disposable plates is corresponding.Wherein, the value of the significance bit of collection is likely 1 also may be 0.
Significance bit numerical value judge module, for judging whether value corresponding to the significance bit of described current acquisition disposable plates that gathers is 0.When current acquisition disposable plates is during range switches, the value of significance bit is " 0 "; After current acquisition disposable plates completes range switching, the value of significance bit reverts to " 1 ".Therefore by judging that whether the numerical value of the significance bit gathered be 0 to judge whether current acquisition disposable plates is in range switching state.
Switching state determination module, when being 0 for the value corresponding in the significance bit of described current acquisition disposable plates, judges that described current acquisition disposable plates is in range switching state, otherwise, judge that described current acquisition disposable plates is in non-range switching state.
As another preferred embodiment, described range switching state judging unit 42 comprises:
Range coding acquisition module, for gathering the range coding in current signal.Wherein, the range coding in current signal adopts triad code composition, and each combines a kind of range of unique corresponding current acquisition process plate.
Range coding comparison module, for the range coding that will gather and the range encoding ratio stored comparatively, and the numerical value of arbitrary in the range coding gathered encode from the range of storage in the numerical value of corresponding position different time, judge that described current acquisition disposable plates is in range switching state.Wherein, the range of storage is encoded to the range coding in the last current signal received.
Electric current delay time determining unit 43; for when described current acquisition disposable plates is in range switching state; the information received according to described information receiving unit determines to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects, and described second current signal is determined according to the range coding of described first current signal and analog quantity.
Preferably, described electric current delay time determining unit 43 comprises:
Range judge module, for judging the range that described current acquisition disposable plates is residing after range switches.Due to a unique corresponding a kind of range of range coding, therefore, also can judge according to range coding the range that current acquisition disposable plates is residing after range switches.
Significance bit duration acquisition module, for obtaining the duration of significance bit corresponding to described current acquisition disposable plates range residing after range switches.Wherein, the duration of the significance bit that each range is corresponding is usually different.
Delay time determination module, for determining to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the duration of significance bit obtained and default delay component.Particularly, the second current signal is sent to the time of ATWT by arranging multiple delay circuit by time delay, then sends block signal realization by the delay circuit arranged.Wherein, this delay circuit realizes mainly through pulsing circuit.
Preferably, send the second current signal described in and be more than or equal to the software processing cycle of TXP system to failing the delay time that the anticipated transient ATWT of emergency shut-down protects.Such as, suppose that the software processing cycle of TXP system is 200ms, be then more than or equal to 200ms to the delay time of the range coding execution delay operation received, preferably, the delay time range coding received being performed to delay operation can be taken as 300ms.Certainly; the software processing cycle of TXP system also may be 100ms; other values such as 400ms; should according to actual conditions; make to send the second current signal and be more than or equal to the software processing cycle (other values such as 100ms, 400ms) of this TXP system to failing delay time that the anticipated transient ATWT of emergency shut-down protects.
Current output unit 44, the delay time for determining according to described electric current delay time determining unit is selected whether send the second current signal and is protected to ATWT.
In second embodiment of the invention, due to send the second current signal to fail emergency shut-down anticipated transient ATWT protect time perform delay operation, therefore TXP system is made to have time enough, obtain the range coding and analog quantity that belong to same current signal, and recalculate current signal according to the range coding belonging to same current signal obtained and analog quantity, avoid and adopt the range of upper current signal coding to calculate with the analog quantity of this current signal the situation causing the current signal calculated to be made mistakes, thus make the current signal exporting ATWT protection to be unusual fluctuations do not occur, reduce the probability that misoperation occurs in ATWT protection.
One of ordinary skill in the art will appreciate that, the all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a disposal route for nuclear power station scattered control system, is characterized in that, described method comprises the steps:
The information that received current acquisition process plate sends; Described information comprises the range coding of the first current signal and the significance bit of current acquisition disposable plates;
Information according to receiving judges whether current acquisition disposable plates is in range switching state;
When described current acquisition disposable plates is in range switching state, determine to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the information received, described second current signal is determined according to the range coding of described first current signal and analog quantity;
Select whether send the second current signal according to the delay time determined to protect to ATWT.
2. the method for claim 1, is characterized in that, the described information according to receiving judges that the step whether current acquisition disposable plates is in range switching state specifically comprises:
Gather the value that the significance bit of described current acquisition disposable plates is corresponding;
Judge whether value corresponding to the significance bit of described current acquisition disposable plates that gathers is 0;
When the value that the significance bit of described current acquisition disposable plates is corresponding is 0, judge that described current acquisition disposable plates is in range switching state, otherwise, judge that described current acquisition disposable plates is in non-range switching state.
3. the method for claim 1, is characterized in that, the described information according to receiving judges that the step whether current acquisition disposable plates is in range switching state specifically comprises:
Gather the range coding in current signal;
By the range coding gathered and the range encoding ratio stored comparatively, and the numerical value of arbitrary in the range coding gathered encode from the range of storage in the numerical value of corresponding position different time, judge that described current acquisition disposable plates is in range switching state.
4. method as claimed in claim 2 or claim 3; it is characterized in that; described when described current acquisition disposable plates is in range switching state, determine to send the second current signal according to the information received and specifically comprise to failing the step of delay time that the anticipated transient ATWT of emergency shut-down protects:
Judge the range that described current acquisition disposable plates is residing after range switches;
Obtain the duration of significance bit corresponding to described current acquisition disposable plates range residing after range switches;
Determine to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the duration of significance bit obtained and default delay component.
5. the method for claim 1, is characterized in that, described in send the second current signal and be more than or equal to the software processing cycle of TXP system to failing the delay time that the anticipated transient ATWT of emergency shut-down protects.
6. a disposal system for nuclear power station scattered control system, is characterized in that, described system comprises:
Information receiving unit, for the information that received current acquisition process plate sends; Described information comprises the range coding of the first current signal and the significance bit of current acquisition disposable plates;
Range switching state judging unit, the information for receiving according to described information receiving unit judges whether current acquisition disposable plates is in range switching state;
Electric current delay time determining unit, for when described current acquisition disposable plates is in range switching state, the information received according to described information receiving unit determines to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects, and described second current signal is determined according to the range coding of described first current signal and analog quantity;
Current output unit, the delay time for determining according to described electric current delay time determining unit is selected whether send the second current signal and is protected to ATWT.
7. system as claimed in claim 6, it is characterized in that, described range switching state judging unit comprises:
Significance bit acquisition module, the value that the significance bit for gathering described current acquisition disposable plates is corresponding;
Significance bit numerical value judge module, for judging whether value corresponding to the significance bit of described current acquisition disposable plates that gathers is 0;
Switching state determination module, when being 0 for the value corresponding in the significance bit of described current acquisition disposable plates, judges that described current acquisition disposable plates is in range switching state, otherwise, judge that described current acquisition disposable plates is in non-range switching state.
8. system as claimed in claim 6, it is characterized in that, described range switching state judging unit comprises:
Range coding acquisition module, for gathering the range coding in current signal;
Range coding comparison module, for the range coding that will gather and the range encoding ratio stored comparatively, and the numerical value of arbitrary in the range coding gathered encode from the range of storage in the numerical value of corresponding position different time, judge that described current acquisition disposable plates is in range switching state.
9. system as claimed in claim 7 or 8, it is characterized in that, described electric current delay time determining unit comprises:
Range judge module, for judging the range that described current acquisition disposable plates is residing after range switches;
Significance bit duration acquisition module, for obtaining the duration of significance bit corresponding to described current acquisition disposable plates range residing after range switches;
Delay time determination module, for determining to send the second current signal to failing the delay time that the anticipated transient ATWT of emergency shut-down protects according to the duration of significance bit obtained and default delay component.
10. system as claimed in claim 6, is characterized in that, described in send the second current signal and be more than or equal to the software processing cycle of TXP system to failing delay time that the anticipated transient ATWT of emergency shut-down protects.
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| CN108733021A (en) * | 2017-11-20 | 2018-11-02 | 江苏核电有限公司 | The method of the double AP failure risks dispersions of DCS system |
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| CN111540485A (en) * | 2020-05-18 | 2020-08-14 | 中国核动力研究设计院 | Protection system for dealing with ATWS (automatic water supply) accident of nuclear power plant caused by loss of normal water supply |
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