CN103338102A - Time synchronization system in nuclear power plant - Google Patents
Time synchronization system in nuclear power plant Download PDFInfo
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- CN103338102A CN103338102A CN 201310283942 CN201310283942A CN103338102A CN 103338102 A CN103338102 A CN 103338102A CN 201310283942 CN201310283942 CN 201310283942 CN 201310283942 A CN201310283942 A CN 201310283942A CN 103338102 A CN103338102 A CN 103338102A
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Abstract
The invention discloses a time synchronization system in a nuclear power plant and belongs to the field of time synchronization. The system is characterized in that a first master clock located in a first nuclear island is connected with a second clock server located in a network control building and a first clock server located in the first nuclear island respectively; a second master clock located in the network control building is connected with the first clock server and the second clock server respectively; and the first clock server generates a multi-system standard time signal according to a received standard time signal and transmits the multi-system standard time signal to a first primary clock, a second primary clock, a third primary clock and a fourth primary clock located in a first conventional island, an operation and maintenance building, a second nuclear island and a second conventional island respectively. According to the system, since the network control building is provided with the master clock, the second nuclear island is provided with the secondary primary clock, and the clock of the second nuclear island and the secondary primary clock of the second conventional island are in parallel, the error generated during time signal transmission is reduced, the time signal precision is improved, and the requirement of power grid side equipment of the network control building on the high precision of the time signal is fully met.
Description
Technical field
The present invention relates to the field of clock synchronization system, particularly clock synchronization system in a kind of AP1000 nuclear power plant.
Background technology
The AP1000 nuclear power technology is a kind of advanced person " non-active compressed water reactor nuclear power technology ", is China's third generation nuclear power proprietary technology, also is the safest, state-of-the-art commercial nuclear power technology in the present global nuclear power market.At present, domesticly building AP1000 nuclear power station 1# machine and 2# machine by unit machine master-plan, clock synchronization system arranges clock synchronization system according to plant area's integral arrangement scheme in the factory.
In the prior art, clock synchronization system comprises two groups of separate time synchronized subsystems, and relevant device such as nuclear island in the zones of different of every group of subsystem responsible, conventional island, O﹠M building, network control building provides time signal.As shown in Figure 1, first group of time synchronized subsystem comprises that 1 cover receives the master clock of gps clock signal, 3 cover secondary master clocks, 4 cover clock servers and 4 cover secondary clocks, internal system adopts primary and secondary structure, be responsible for to first nuclear island, first conventional island, BOP(Balance Of Plant, auxiliary system) and the administration quarter building time signal is provided, this BOP comprises O﹠M building and network control building etc., and first group of required overlay area of time synchronized subsystem is bigger.Second group of time synchronized subsystem comprises that 1 cover receives the master clock of gps clock signal, 1 cover secondary master clock and 2 cover clock servers, and internal system adopts primary and secondary structure, and main being responsible for provides time signal to second nuclear island and second conventional island.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art: clock synchronization system has comprised that two cover inside are hypotactic time synchronized subsystem, complete independent operating between the two cover time synchronized subsystems, in case certain subsystem goes wrong, the output of time signal that can the whole clock synchronization system of influence impacts the normal operation of entire power plant.
Summary of the invention
In order to solve prior art problems, the embodiment of the invention provides clock synchronization system in a kind of nuclear power plant.Described technical scheme is as follows:
Clock synchronization system in a kind of nuclear power plant, described system comprises: be positioned at first master clock and first clock server of first nuclear island, second master clock that is positioned at the network control building and second clock server, first master clock, second master clock, the 3rd master clock and the 4th master clock;
Described first master clock is connected with described first clock server and described second clock server respectively;
Described second master clock is connected with described second clock server and described first clock server respectively;
Described first clock server receives the time reference signal that described first master clock produces, generate the time reference signal of multi-modulation scheme according to described time reference signal, and the time reference signal of described multi-modulation scheme is sent to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively;
Described first master clock, described second master clock, described the 3rd master clock and described the 4th master clock lay respectively at first conventional island, O﹠M building, second nuclear island and second conventional island.
Wherein, described second clock server connects described second master clock, receive the time reference signal that described second master clock produces, generate signal lock in time of multi-modulation scheme according to described time reference signal, and signal lock in time of described multi-modulation scheme is sent to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively.
Wherein, described system also comprises the 3rd clock server, the 4th clock server, the 5th clock server and the 6th clock server, lays respectively at described first conventional island, described O﹠M building, described second nuclear island and described second conventional island;
Described the 3rd clock server connects described first master clock, receive signal lock in time of the multi-modulation scheme of described first master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock;
Described the 4th clock server connects described second master clock, receive signal lock in time of the multi-modulation scheme of described second master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock;
Described the 5th clock server connects described the 3rd master clock, receive signal lock in time of the multi-modulation scheme of described the 3rd master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock;
Described the 6th clock server connects described the 4th master clock, receive signal lock in time of the multi-modulation scheme of described the 4th master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock.
Wherein, described first master clock and/or described second master clock are built-in with global position system GPS wireless receiving module, Big Dipper wireless receiving module, crystal oscillator module and the signal processing module that is connected respectively with described GPS wireless receiving module, described Big Dipper wireless receiving module and described crystal oscillator module;
Described GPS wireless receiving module is used for receiving the gps time signal that gps satellite sends;
Described Big Dipper wireless receiving module is used for receiving the Big Dipper time signal that Big Dipper a reference source sends;
Described signal processing module, be used for obtaining the crystal oscillator time signal that described gps time signal, described Big Dipper time signal and described crystal oscillator module produce, and according to default rule described gps time signal, described Big Dipper time signal and described crystal oscillator time signal are handled, obtain time reference signal.
Wherein, described signal processing module comprises acquiring unit and processing unit;
Described acquiring unit is used for obtaining the crystal oscillator time signal that described gps time signal, described Big Dipper time signal and described crystal oscillator module produce;
Described processing unit, be used for arranging the priority-level of described gps time signal, described Big Dipper time signal and described crystal oscillator time signal, size according to priority-level is handled described gps time signal, described Big Dipper time signal and described crystal oscillator time signal, obtains time reference signal.
Wherein, described first master clock and/or described second master clock be built-in wired receiver module also, is used for receiving wired time reference signal that grid side sends;
Correspondingly, described signal processing module also is used for obtaining described wired time reference signal, and when obtaining less than described gps time signal and described Big Dipper time signal, obtains time reference signal according to described wired time reference signal.
Wherein, the time reference signal that obtains of described signal processing module is the DC B sign indicating number.
Wherein, described crystal oscillator block configuration have the crystal oscillator integrated circuit board and with the rubidium clock integrated circuit board of described crystal oscillation plate card connection.
Wherein, described signal lock in time with described multi-modulation scheme sends to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively, comprising:
By optical fiber signal lock in time of described multi-modulation scheme is sent to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively.
Wherein, described first master clock, described first clock server and described the 3rd master clock are powered by nuclear island EDS power supply subsystem;
Described second master clock is powered by the UPS power supply subsystem that is located at described network control building;
Described first master clock, described the 4th master clock are powered by station-service UPS power supply subsystem;
Described second master clock is powered by the 2nd UPS power supply subsystem
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
By master clock being separately positioned on first nuclear island and network control building, form mutually fully at the master clock of first nuclear island with between the master clock in network control building, even any cover master clock breaks down, still can receive the time signal from another set of master clock, fail safe and the reliability of system have been strengthened, in addition, the master clock that is positioned at second nuclear island changes parallel relation with the master clock that is positioned at second conventional island into by original master slave relation, reduced the time delay of time signal transmission, improve the precision of time signal, fully satisfied the requirements for high precision of network control building grid side equipment to time signal.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the clock synchronization system structural representation that provides in the prior art;
Fig. 2 is the clock synchronization system structural representation that the embodiment of the invention 1 provides;
Fig. 3 is the clock synchronization system structural representation that the embodiment of the invention 2 provides;
Fig. 4 is the clock synchronization system structural representation that the embodiment of the invention 3 provides.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Embodiment 1
Referring to Fig. 2, the embodiment of the invention provides clock synchronization system in a kind of nuclear power plant, and described system comprises: be positioned at first master clock 101 and first clock server 301 of first nuclear island, second master clock 102 that is positioned at the network control building and second clock server 302, first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204;
First clock server 301 receives the time reference signal that first master clock 101 produces, generate signal lock in time of multi-modulation scheme according to time reference signal, and signal lock in time of multi-modulation scheme is sent to first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 respectively;
First master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 lay respectively at first conventional island, O﹠M building, second nuclear island and second conventional island.
The system that the embodiment of the invention provides, by master clock being separately positioned on first nuclear island and network control building, form mutually fully at the master clock of first nuclear island with between the master clock in network control building, even any cover master clock breaks down, still can receive the time signal from another set of master clock, fail safe and the reliability of system have been strengthened, in addition, the master clock that is positioned at second nuclear island changes parallel relation with the master clock that is positioned at second conventional island into by original master slave relation, reduced the time delay of time signal transmission, improve the precision of time signal, fully satisfied the requirements for high precision of network control building grid side equipment to time signal.
Embodiment 2
Referring to Fig. 3, for making the operation of AP1000 nuclear power station clock synchronization system safer, structure is more reasonable, and the embodiment of the invention is improved from system group network and receiving side signal face, the embodiment of the invention provides clock synchronization system in a kind of nuclear power plant, and described system comprises:
Wherein, first master clock 101 is positioned at first nuclear island, is connected respectively with the second master clock server 302 that is positioned at the network control building and the first master clock server 301 that is positioned at first nuclear island; First master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 lay respectively at first conventional island, O﹠M building, second nuclear island and second conventional island;
First clock server 301 connects first master clock 101, receive the time reference signal that first master clock 101 produces, generate signal lock in time of multi-modulation scheme according to time reference signal, and signal lock in time of multi-modulation scheme is sent to first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 respectively;
Second clock server 302 connects second master clock 102, receive the time reference signal that second master clock 102 produces, generate signal lock in time of multi-modulation scheme according to time reference signal, and signal lock in time of multi-modulation scheme is sent to first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 respectively.
Wherein, master clock is the maincenter part of whole clock synchronization system, its precision and stability have determined the reliability of whole system to a great extent, and the embodiment of the invention all is provided with master clock at first nuclear island and network control building, is called first master clock and second master clock.
In order to guarantee the reliability of clock synchronization system, present embodiment is provided with multiple time source at first master clock and/or second master clock, particularly, first master clock and/or second master clock are built-in with GPS wireless receiving module, Big Dipper wireless receiving module and crystal oscillator module, the GPS wireless receiving module can receive the gps time signal that gps satellite sends, Big Dipper wireless receiving module can receive the Big Dipper time signal that Big Dipper a reference source sends, and the crystal oscillator module is for generation of the crystal oscillator time signal.The parallel running simultaneously of each module when one or two module breaks down, does not influence other modules and normally moves, and each module all has self-checking function, and the discovery fault can be reported to the police immediately.
Particularly, first master clock and/or second master clock also are built-in with the signal processing module that is connected with above-mentioned GPS wireless receiving module, Big Dipper wireless receiving module and crystal oscillator module, be used for receiving the crystal oscillator time signal that gps time signal, bucket time signal and crystal oscillator module produce, and according to default rule gps time signal, Big Dipper time signal and crystal oscillator time signal are handled, obtain time reference signal.
Preferred as above-described embodiment, signal processing module comprises acquiring unit and processing unit; Acquiring unit is used for obtaining the crystal oscillator time signal that gps time signal, Big Dipper time signal and crystal oscillator module produce; Processing unit is used for arranging the priority-level of gps time signal, Big Dipper time signal and crystal oscillator time signal, according to the size of priority-level gps time signal, Big Dipper time signal and crystal oscillator time signal is handled, and obtains time reference signal.In the present embodiment, the priority-level of setting can for gps time signal greater than Big Dipper time signal, Big Dipper time signal is greater than the crystal oscillator time signal, when receiving gps time signal, then with this gps time signal as time reference signal; Do not receive gps time signal, when receiving Big Dipper signal, then with this Big Dipper signal as time reference signal; Do not receive gps time signal and Big Dipper signal, then the crystal oscillator time signal that produces with the crystal oscillator module is as time reference signal.
Particularly, the GPS wireless receiving module that master clock is built-in, can be provided the fiducial time that provides from gps satellite, the UTC(Universal Time Coordinated of acquisition standard, Coordinated Universal Time(UTC)) time, and produce accurate standard sign indicating number lock in time, in order to offer clock server and/or control and management terminal.The precision of the gps time signal that master clock receives can reach 10
-12, the time reference signal signal accuracy of master clock output is better than 10
-6When gps time signal breaks down, master clock will rely on the Big Dipper wireless receiving module that arranges, and receive the IRIG-B(Inter Range Instrumentation Group that Big Dipper a reference source provides, a kind of alternating-current B sign indicating number) Big Dipper time signal.Preferably, master clock also is built-in with a judge module, be used for judging whether the gps time signal that receives is correct, if correct, then this gps time signal is sent to signal processing module, if incorrect, show that then this gps time signal breaks down, be punctual benchmark with the correct gps time signal of receiving for the last time, when continuing that clock server carried out the school, can also send the warning message of " GPS fault "; Judge module also is used for judging whether the Big Dipper time that receives is correct, if it is correct, then this Big Dipper time signal is sent to signal processing module, if it is incorrect, show that then this Big Dipper time signal breaks down, when module is judged gps time signal and Big Dipper time signal and is all broken down when the school, master clock will rely on the crystal oscillator module independent operating of self high stable constant temperature, be the benchmark of keeping time with the correct gps time signal received for the last time for punctual benchmark or the last Big Dipper time signal that receives, when continuation is carried out the school to clock server, can also send the warning message of " GPS fault " and " Big Dipper fault ", master clock has function when walking, and time keeping error is 0.92us/ minute.
In the embodiment of the invention, in the configuration of first master clock and the second master clock time of reception signal, take redundant configuration and adopt different time services source, namely adopt GPS wireless receiving module and Big Dipper wireless receiving module, improved the fail safe that wireless signal receives greatly, compare with the mode that at present only disposes 1 road GPS input signal at master clock, can prevent the long-term free oscillation that extraneous signal disturbs and wireless receiving integrated circuit board failure and other reasons causes, strengthen system reliability, fail safe.
Preferably, second master clock is built-in wired receiver module also, can receive wired time reference signal that grid side sends.Particularly, because nuclear power station has with electric power system as power supply point and connect, on the unified basis of nuclear power station internal clocking synchronous base, should unify with the clock that inserts electrical network, so that the differentiation that system breaks down.Under the master clock normal condition, IRIG-B(alternating-current B sign indicating number that tracking gps time signal, Big Dipper a reference source provide) time signal, synchronous as time reference signal and the electrical network retention time of system with wireless reference signal; When the unusual time satellite is unavailable can't receive the wireless time signal time, follow the tracks of grid side by wired reference signal of transmission network or data dispatching network transmission, as DCLS(DC B sign indicating number) time signal or through the NTP(Network Time Protocol of data network transmission, a kind of time synchronization protocol) signal, synchronous as time reference signal and the electrical network retention time of system with wired reference signal.
In the embodiment of the invention, on master clock crystal oscillator modules configured, disposed 1 crystal oscillator integrated circuit board and 1 rubidium clock integrated circuit board, the time signal precision of rubidium clock integrated circuit board can reach 10
-12, improved greatly whole clock synchronization system short stability can and normal stability energy, also increased stability and the output time precision of system.
Particularly; owing to have relatively high expectations to time precision in the network control building; and devices such as the route protection of installing in the network control building are also very high to the required precision of time signal; for the error that reduces to produce in the signal transmission; improve the precision of time signal; the embodiment of the invention is arranged on the network control building with second master clock; originally the secondary master clock that was arranged on the network control building is upgraded to master clock; and at first conventional island; the O﹠M building; in second nuclear island and second conventional island master clock is set respectively; make the master clock that is positioned at second nuclear island and the master clock that is positioned at second conventional island change parallel relation into by master slave relation, reduced the time delay of time signal transmission.The secondary master clock in network control building is upgraded to the one-level master clock, reduced the time delay of signal transmission, improved the precision of clock sync signal, fully satisfied the demand of network control building grid side equipment to the split-second precision signal.
Further, first master clock that is positioned at first nuclear island can be connected by optical fiber with the second master clock server that is positioned at the network control building, this second all the time server connect second master clock, thereby first master clock and second master clock form mutually and are equipped with.Like this, when any cover master clock breaks down, still can receive the time signal from another set of clock synchronization system, greatly increase fail safe and the reliability of system.
Wherein, clock server receive from higher level's master clock (as, master clock) time reference signal, generate the time reference signal of multi-modulation scheme according to time reference signal, and the time reference signal of multi-modulation scheme sent to subordinate's master clock, the standard clock signal of multi-modulation scheme is provided for subordinate's master clock (as, master clock) and other main frames or device, clock server can also be closed output port when the time signal that does not receive higher level's master clock synchronizing signal or note abnormalities.Clock server can provide time signal and the frequency signal of serial code, pulse signal, B sign indicating number, MOSFET idle contact, multiple forms such as NTP, SNTP by multiple output card, on-the-spotly disposes integrated circuit board according to demand to export dissimilar time signals.Wherein, serial code such as RS232(recommended standard232, a kind of serial physical interface standard), RS485/422(serial physical interface standard) etc., pulse signal such as PPS, PPM, PPH, PPD etc., B sign indicating number such as direct current difference B sign indicating number, direct current TTL B sign indicating number, Sine Modulated alternating-current B sign indicating number etc.
Particularly, two clock servers are set in the present embodiment at least, be respectively first clock server 301 that is connected with first master clock 101 and the second clock server 302 that is connected with second master clock 102, first clock server 301 sends to first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 respectively with signal lock in time of multi-modulation scheme, and second clock server 302 sends to first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 respectively with signal lock in time of multi-modulation scheme.
Like this, all secondary master clocks all are connected with second master clock that is positioned at the network control building with first master clock that is positioned at first nuclear island, the secondary master clock receives the time synchronizing signal from first master clock and second master clock simultaneously, possessed 2 external clock references, improved the reliability of secondary master clock greatly, clock synchronization system has just changed the clock synchronization system that master clock is equipped with mutually, secondary master clock 2 tunnel is imported into by single master-slave mode.
Wherein, present embodiment is provided with the master clock of the time reference signal that a plurality of receptions provide from master clock, can be called the secondary master clock, the secondary master clock is calibrated the time signal of self, and by netting twine, telecommunication cable, optical fiber or optical cable time signal is sent to clock server and/or control and management terminal.The secondary master clock is separately positioned on first conventional island, second conventional island, second nuclear island and O﹠M building.For guaranteeing the stability of system, the secondary master clock is set to triple clocks source, namely comprises the redundant configuration of GPS wireless receiving module, Big Dipper wireless receiving module and crystal oscillator module, and three modules are moved simultaneously, one of them or two modules break down, and do not influence other modules and normally move.When importing from the time signal of higher level's master clock, the secondary master clock can produce precision and be better than 10
-6The temporal frequency reference signal, when losing master clock signal when input, the secondary master clock also has function when walking, time keeping error is 0.92us/ minute.
In the embodiment of the invention, be connected with first master clock, second master clock, the 3rd master clock and the 4th master clock respectively by first clock server that will be connected with first master clock, make the master clock of winning, second master clock, the 3rd master clock and the 4th master clock can receive the time reference signal of the multi-modulation scheme of first master clock transmission, like this, form the interconnected clock synchronization system of one between two first master clocks and four master clocks, realized the time unification in the whole clock synchronization system.
The system that the embodiment of the invention provides, by master clock being separately positioned on first nuclear island and network control building, form mutually fully at the master clock of first nuclear island with between the master clock in network control building, even any cover master clock breaks down, still can receive the time signal from another set of master clock, strengthen fail safe and the reliability of system.In addition, the master clock that is positioned at second nuclear island changes parallel relation with the master clock that is positioned at second conventional island into by original master slave relation, reduce the time delay of time signal transmission, improved the precision of time signal, fully satisfied the requirements for high precision of network control building grid side equipment to time signal.The wireless receiving module of master clock receives GPS and two kinds of time sources of the Big Dipper, and can receive wired time signal source, has improved the fail safe that wireless signal receives greatly.In master clock, dispose the rubidium clock integrated circuit board, improve the stability of whole clock synchronization system greatly, also increased the stability of system and the precision of output time.By two external clock references are provided for the secondary master clock, improved the reliability of secondary master clock greatly, further increased the stability of system and the precision of output time.
Embodiment 3
The embodiment of the invention is to improve on the basis of above-described embodiment 2, referring to Fig. 4, clock synchronization system is also improving aspect system's power supply in the nuclear power plant that present embodiment provides, and described system comprises: first master clock 101, second master clock 102, first master clock 201, second master clock 202, the 3rd master clock 203, the 4th master clock 204, first clock server 301 and second clock server 302;
Wherein, first master clock 101 is positioned at first nuclear island, is connected respectively with the second master clock server 302 that is positioned at the network control building and first master clock 301 that is positioned at first nuclear island; Second master clock 202 is connected with second clock server 302 and first clock server 301 respectively;
First master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 lay respectively at first conventional island, O﹠M building, second nuclear island and second conventional island;
First clock server 301 connects first master clock 101, receive the time reference signal that first master clock 101 produces, generate signal lock in time of multi-modulation scheme according to time reference signal, and signal lock in time of multi-modulation scheme is sent to first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 respectively;
Second clock server 302 connects second master clock 102, receive the time reference signal that second master clock 102 produces, generate signal lock in time of multi-modulation scheme according to time reference signal, and signal lock in time of multi-modulation scheme is sent to first master clock 201, second master clock 202, the 3rd master clock 203 and the 4th master clock 204 respectively;
Further, the clock system that present embodiment provides also comprises the 3rd clock server 303, the 4th clock server 304, the 5th clock server 305 and the 6th clock server 306, lays respectively at first conventional island, O﹠M building, second nuclear island and second conventional island;
The 3rd clock server 303 connects first master clock 201, receive signal lock in time of the multi-modulation scheme of first master clock, 201 transmissions, signal lock in time of multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of multi-format is sent to secondary clock;
The 4th clock server 304 connects second master clock 202, receive signal lock in time of the multi-modulation scheme of second master clock, 202 transmissions, signal lock in time of multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of multi-format is sent to secondary clock;
The 5th clock server 305 connects the 3rd master clock 203, receive signal lock in time of the multi-modulation scheme of the 3rd master clock 203 transmissions, signal lock in time of multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of multi-format is sent to secondary clock;
The 6th clock server 306 connects the 4th master clock 204, receive signal lock in time of the multi-modulation scheme of the 4th master clock 204 transmissions, signal lock in time of multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of multi-format is sent to secondary clock.
Wherein, secondary clock is used for the demonstration time, is installed in factory and Administrative Area, is provided with a plurality of secondary clocks in whole system, for each regional work personnel provides temporal information accurately.Under the normal operating conditions, secondary clock via the clock server automatic reception from the time reference signal of master clock as correcting delay signal, correctly show after self calibrated time; Under the abnormal conditions, after secondary clock and the master clock communication disruption, the time signal independent operating that secondary clock still can adopt self crystal oscillator to produce.
In the process of each signal transmission zone time, in order to reduce distorted signals to the influence of time accuracy, the transmission medium of master clock and secondary master clock adopts optical fiber, and signal adopts the less DCLS(DC B sign indicating number of time synchronized accuracy influence) signal.
Further, the clock system that the embodiment of the invention provides is powered by the power supply subsystem, this power supply subsystem comprises: power supply subsystem, the UPS(Uninterrupted Power Supply non-1E level of nuclear island EDS(direct current), uninterrupted power supply) power supply subsystem, station-service UPS power supply subsystem and the 2nd UPS power supply subsystem; Wherein, nuclear island EDS power supply subsystem is that the master clock of first nuclear island and the secondary master clock of second nuclear island are powered; The one UPS power supply subsystem is located at the network control building, for the network control building powers; Station-service UPS power supply subsystem is the secondary master clock of first conventional island, the secondary master clock of second conventional island, and all secondary clocks are powered; The 2nd UPS power supply subsystem is that the secondary master clock in O﹠M building is powered.
Particularly, VXO: the master clock of first nuclear island is by the power supply of nuclear island EDS system, and the master clock in network control building is by the ups system power supply that is located at the network control building, and after losing station service, master clock still can be kept power supply 2 hours; The power supply of secondary master clock: the secondary master clock of first conventional island and second conventional island is by the power supply of station-service ups system, and the second nuclear island secondary master clock is by the power supply of nuclear island EDS system, and after losing station service, the secondary master clock still can be kept power supply 2 hours; The secondary master clock in O﹠M building is by the ups system that arranges separately in the O﹠M building, and after losing station service, the secondary master clock still can be kept power supply 2 hours.
Further, the clock system of the embodiment of the invention also comprises access switch, and this access switch connects secondary master clock and factory building.Wherein, above-mentioned power supply subsystem also comprises the 3rd UPS power supply subsystem, is used to access switch to power, and can guarantee after losing station service, still can keep power supply 2 hours, still can provide time synchronizing signal to equipment in the factory building.
The system that the embodiment of the invention provides, by master clock being separately positioned on first nuclear island and network control building, form mutually fully at the master clock of first nuclear island with between the master clock in network control building, even any cover master clock breaks down, still can receive the time signal from another set of master clock, strengthen fail safe and the reliability of system.In addition, the master clock that is positioned at second nuclear island changes parallel relation with the master clock that is positioned at second conventional island into by original master slave relation, reduce the time delay of time signal transmission, improved the precision of time signal, fully satisfied the requirements for high precision of network control building grid side equipment to time signal.By master clock is adopted different power supply subsystems with the secondary master clock, improved the fail safe of system's power supply.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The all or part of step that one of ordinary skill in the art will appreciate that realization above-described embodiment can be finished by hardware, also can instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. clock synchronization system in the nuclear power plant, it is characterized in that described system comprises: be positioned at first master clock and first clock server of first nuclear island, second master clock that is positioned at the network control building and second clock server, first master clock, second master clock, the 3rd master clock and the 4th master clock;
Described first master clock is connected with described first clock server and described second clock server respectively;
Described second master clock is connected with described second clock server and described first clock server respectively;
Described first clock server receives the time reference signal that described first master clock produces, generate the time reference signal of multi-modulation scheme according to described time reference signal, and the time reference signal of described multi-modulation scheme is sent to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively;
Described first master clock, described second master clock, described the 3rd master clock and described the 4th master clock lay respectively at first conventional island, O﹠M building, second nuclear island and second conventional island.
2. the system as claimed in claim 1, it is characterized in that, described second clock server connects described second master clock, receive the time reference signal that described second master clock produces, generate signal lock in time of multi-modulation scheme according to described time reference signal, and signal lock in time of described multi-modulation scheme is sent to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively.
3. system as claimed in claim 1 or 2, it is characterized in that, described system also comprises the 3rd clock server, the 4th clock server, the 5th clock server and the 6th clock server, lays respectively at described first conventional island, described O﹠M building, described second nuclear island and described second conventional island;
Described the 3rd clock server connects described first master clock, receive signal lock in time of the multi-modulation scheme of described first master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock;
Described the 4th clock server connects described second master clock, receive signal lock in time of the multi-modulation scheme of described second master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock;
Described the 5th clock server connects described the 3rd master clock, receive signal lock in time of the multi-modulation scheme of described the 3rd master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock;
Described the 6th clock server connects described the 4th master clock, receive signal lock in time of the multi-modulation scheme of described the 4th master clock transmission, signal lock in time of described multi-modulation scheme is expanded signal lock in time that obtains multiple form, and signal lock in time of described multi-format is sent to secondary clock.
4. system as claimed in claim 1 or 2, it is characterized in that described first master clock and/or described second master clock are built-in with global position system GPS wireless receiving module, Big Dipper wireless receiving module, crystal oscillator module and the signal processing module that is connected respectively with described GPS wireless receiving module, described Big Dipper wireless receiving module and described crystal oscillator module;
Described GPS wireless receiving module is used for receiving the gps time signal that gps satellite sends;
Described Big Dipper wireless receiving module is used for receiving the Big Dipper time signal that Big Dipper a reference source sends;
Described signal processing module, be used for obtaining the crystal oscillator time signal that described gps time signal, described Big Dipper time signal and described crystal oscillator module produce, and according to default rule described gps time signal, described Big Dipper time signal and described crystal oscillator time signal are handled, obtain time reference signal.
5. system as claimed in claim 4 is characterized in that, described signal processing module comprises acquiring unit and processing unit;
Described acquiring unit is used for obtaining the crystal oscillator time signal that described gps time signal, described Big Dipper time signal and described crystal oscillator module produce;
Described processing unit, be used for arranging the priority-level of described gps time signal, described Big Dipper time signal and described crystal oscillator time signal, size according to priority-level is handled described gps time signal, described Big Dipper time signal and described crystal oscillator time signal, obtains time reference signal.
6. system as claimed in claim 4 is characterized in that, described first master clock and/or described second master clock be built-in wired receiver module also, is used for receiving wired time reference signal that grid side sends;
Correspondingly, described signal processing module also is used for obtaining described wired time reference signal, and when obtaining less than described gps time signal and described Big Dipper time signal, obtains time reference signal according to described wired time reference signal.
7. system as claimed in claim 6 is characterized in that, the time reference signal that described signal processing module obtains is the DC B sign indicating number.
8. system as claimed in claim 4 is characterized in that, described crystal oscillator block configuration have the crystal oscillator integrated circuit board and with the rubidium clock integrated circuit board of described crystal oscillation plate card connection.
9. system as claimed in claim 1 or 2 is characterized in that, described signal lock in time with described multi-modulation scheme sends to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively, comprising:
By optical fiber signal lock in time of described multi-modulation scheme is sent to first master clock, described second master clock, described the 3rd master clock and described the 4th master clock respectively.
10. the system as claimed in claim 1 is characterized in that, described first master clock, described first clock server and described the 3rd master clock are powered by nuclear island EDS power supply subsystem;
Described second master clock is powered by the UPS power supply subsystem that is located at described network control building;
Described first master clock, described the 4th master clock are powered by station-service UPS power supply subsystem;
Described second master clock is powered by the 2nd UPS power supply subsystem.
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