CN1312472A - Synchronous transient-process recording method and device - Google Patents
Synchronous transient-process recording method and device Download PDFInfo
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Abstract
The present invention relates to a synchronous recording method of transient variation process of power system and its equipment, which is characterized by that it uses high-precision crystal oscillator to drive AD to sample, and makes circulation collection of measurement signals, when the failure is taken place and the transient processes of switching operation, etc. are produced, the accurate time of the moment when the starting signal is produced can be recorded, and the collected result before starting and after starting can be retained. The clock can be implemented by GPS synchronous crystal oscillator, and the deviation resulted from S.A interference and satellite losing lock can be eliminated, and the self-produced second pulse deviation is less than 0.1 microsecond. Under the synchronous action of clock the several recording devices capable of making signal synchronous measurements at different measurement points and are connected into network to implement said invention.
Description
The invention belongs to relay protection of power system technical field and high voltage measuring technical field, relate to a kind of high-speed record method and implement device electric power system fault temporal variations process.
In perturbation process such as electric power system fault, operation, thunder and lightning, voltage, current signal contain abundant high fdrequency component, contain a large amount of system status informations.Transient-State Analysis of Power System, transient protection, row ripple location, and fault detect etc. all require transient state process of electric power system is carried out record analysis, and generally need be to the transient state process hypervelocity synchronous recording of electric system strange land measurement point.
Present fault wave recording device both domestic and external, high speed acquisition device do not satisfy the requirement that the fault transient process high-speed synchronous is gathered.Generic failure wave recording device AD sampling rate is 1kHz～5kHz only, does not satisfy the requirement to the transient state process of electric power system record.But some high-speed AD acquisition cards are arranged in addition, and its sample frequency is very high, can reach 20MHz, generally has only a passage, 8 precision, and do not possess the synchronous time mark signal, can not satisfy the transient state process of electric system strange land measurement point is carried out synchronous recording.Current, the whole world that U.S. Department of Defense sets up is Position Fixing Navigation System (hereinafter to be referred as GPS) regularly, and whenever in any place the possibility of accurate timing and location is provided.Timing function is accepted the split-second precision information realization that satellite in the sky sends by the GPS receiver.Factor the such as whether number of satellite of the clock accuracy that the GPS receiver receives and the clock accuracy of satellites transmits, GPS receiver locking tracking, the duty of GPS receiver own be normal is relevant.The U.S. has and has added selectivity interference (SELECTIVE AVAILABILITY disturbs hereinafter to be referred as S.A.) in the signal of the satellites transmits of being intended to, and the timing bearing accuracy that domestic consumer is obtained descends greatly.The time precision index that the OEM plate of general GPS receiver provides is a probability level, pulse per second (PPS) error Normal Distribution, the GPS receiver of MOTOROLA VP ONCORE for example, statistical precision is the GPS receiver of 50nS, according to experiment in normal working conditions, maximum deviation may reach 2 μ S, but under the situation of satellite step-out, deviation even reach a few tens of milliseconds.In order to obtain high precision clock, need further handle the clock signal that the GPS receiver receives.The patent of invention of application number 97108825.X " a kind of timing method and equipment " by name based on gps signal, adopt one to differ changing value and to differ the binary voltages control table that rate of change is an independent variable, the voltage of VCXO is adjusted in control, to produce high precision clock, this method need be carried out the DA conversion to the digital signal of computing machine output, produce analog quantity, control VCXO, whole control process complexity.The patent of invention of application number 98106172.9 " the synchronous method of retention time and the synchronous device of this method of enforcement in distributed network system synchronously " by name, disclose a kind of clock that adopts in the synchronous distributed network system (DNS) of gps clock signal correction, but do not provided the method for eliminating the gps clock deviation of signal.
For addressing the above problem, the object of the present invention is to provide a kind of method and apparatus of the synchronous transient state waveform recording of GPS of high-speed, high precision, can realize transient state process of electric power system is carried out strange land synchronous high-speed sample record.
For realizing above purpose, the present invention proposes following method:
1. the synchronous recording method of a temporal variations process comprises the steps:
(1) produces high precision clock by the synchronous GPS of high precision constant temperature crystal oscillator (GPS).
(2) drive high-speed AD continuous sampling by high precision constant temperature crystal oscillator, the circulation storage refreshes card and goes up data in the storer, need not CPU and intervenes.When having enabling signal to occur, the time value of high precision clock in the read step (1), time-delay gather a period of time (by the setting valve setting, generally get 20～200mS) after, CPU with the data conversion storage on the storer in internal memory.
(3) data before and after the preservation startup, the generation moment of each data correspondence is by the startup moment and the position calculation of these data in data file that write down in the step (2).
(4) a plurality of pen recorders can pass through the time scale registration at the different local different pieces of information files of measuring, the size that reflects synchronization different location, unlike signal, and can be reflected in the situation of change of different location in the same time period, unlike signal, can be used for the analysis of transient state process of electric power system or other industry synchro measure to the strange land signal.
2. gather the synchronous high precision clock of GPS of synchronizing function in the realization above-mentioned requirements
Follow the tracks of the clock signal of accepting gps satellite by the GPS receiver, produce the GPS pps pulse per second signal (1PPS) of a pulse in a second.By high precision crystal oscillator output high-frequency oscillation signal, obtain the self-produced pps pulse per second signal of a pulse in a second through frequency division.The pulse per second (PPS) of self-produced pulse per second (PPS) and GPS through phase detector relatively, obtain the phase deviation of the two, phase deviation is asked on average, according to the self-produced pps pulse per second signal of mean value correction of phase deviation, effectively eliminate the random deviation of gps clock and the Accumulated deviation of crystal oscillator, improve self-produced pps pulse per second signal precision.Further be analyzed as follows:
(1) because there is not Accumulated deviation in the GPS pulse per second (PPS), to have long-time stability good, but is subjected to the influence of factors such as S.A. interference, satellite losing lock, has the characteristics of short-term stability difference.From the precision of each pulse per second (PPS), may there be bigger deviation.Just because of this, the time precision that provides of GPS receiver is a probability level.For example: the time precision index that MOTOROLA VP ONCORE type GPS receiver provides is under " stationkeeping " pattern, 50nS (1 σ), its implication is that satellite antenna remains static down, and the pulse per second (PPS) deviation of this GPS receiver is approximated to normal distribution: and ε ∈ N (0, σ
2), the indignant rate that falls within 1 σ probable range (time deviation is less than 50nS) is 0.6828, that is to say, has the pulse per second (PPS) of probability 0.3173, deviation is greater than 50nS; The indignant rate that falls within 2 σ probable ranges (time deviation is less than 100nS) is 0.9546; The indignant rate that falls within 3 σ probable ranges (time deviation is less than 150nS) is 0.9974.According to inventor's experiment, maximum deviation may reach 2 μ S.If average to asking of M pulse per second (PPS) deviation, mean value is Normal Distribution also:
, promptly under the identical indignant rate that may occur, the mean value of M pulse per second (PPS) deviation is the deviation of single pulse per second (PPS)
That is to say, pulse per second (PPS) deviation mean value less than
The indignant rate that occurs is 0.6828, pulse per second (PPS) deviation mean value less than
The indignant rate that occurs is 0.9546, pulse per second (PPS) deviation mean value less than
The indignant rate that occurs is 0.9974.So adopt the method for averaging to offset the random disturbance of part GPS pulse per second (PPS), improve the precision of GPS pulse per second (PPS).
(2) have the high precision crystal oscillator of temperature compensation function, very little from the precision deviation of each pulse per second (PPS), but deviation generally is in the same way, promptly most of pulse per second (PPS) is overgauge simultaneously or is minus deviation simultaneously in a period of time, long-time in Accumulated deviation bigger.As precision is 10
-9The constant-temperature crystal oscillator of second, the Accumulated deviation in 1 second is less than 10
-9Second, one day Accumulated deviation is less than 86.4 μ S.Adopt the signal frequency split of crystal oscillator vibration output to obtain self-produced pps pulse per second signal, long-play, self-produced pps pulse per second signal have bigger accumulation deviation.If at set intervals self-produced pps pulse per second signal is once proofreaied and correct, eliminate the accumulation deviation, can obtain high-precision self-produced pulse per second (PPS) clock signal.
(3) correction of the frequency division of crystal oscillator output signal and self-produced pps pulse per second signal is finished by counter and comparer.The crystal oscillator outputting oscillation signal is added up by counter, and accumulation result and CPU setting valve through comparer relatively when the two is identical, produce one-second burst output signal (being self-produced pps pulse per second signal), and reset counter.The correction of self-produced pulse per second (PPS) is finished by the adjustment to setting valve, and rounding definite value usually is the oscillation frequency value of crystal oscillator, and for eliminating the Accumulated deviation of crystal oscillator, setting valve is adjusted one time in every measurement M time.That is to say: rounding definite value is the oscillation frequency value of crystal oscillator, and the phase differential of M GPS pulse per second (PPS) of continuous recording and self-produced pulse per second (PPS) is averaged and rounded.When mean value is non-vanishing, adjust one time setting valve.Method of adjustment is: if during the leading self-produced pulse per second (PPS) of GPS pulse per second (PPS), setting valve deducts mean value; And when if the GPS pulse per second (PPS) falls behind self-produced pulse per second (PPS), then setting valve adds mean value.Adopt adjusted setting valve, operation one-period, comparer produce pulse per second (PPS) output.Then, immediately setting valve is re-set as the oscillation frequency value of crystal oscillator, M phase differential of continuous coverage adjusted setting valve one time again by phase differential mean value, so repeatedly, produces high-precision self-produced pulse per second (PPS) clock.
(4) in conjunction with above-mentioned (1), (2), (3), analyzing the 10MHz precision is 10
-9The self-produced pps pulse per second signal that the constant-temperature crystal oscillator frequency division of second obtains cooperates with the GPS pps pulse per second signal.The per 100 seconds Accumulated deviation of crystal oscillator is less than 10
-7S is promptly less than unit cycle of crystal oscillator oscillator signal.Therefore can get per 100 seconds to the offset correction of crystal oscillator once, promptly getting M is 100.Establishing under the condition that setting valve is 10M, by the deviation of GPS pulse per second (PPS) of record of phase detector per second and self-produced pulse per second (PPS), accumulative total 100 times is asked on average deviation, and is rounded.Analyzed by above-mentioned (1), the mean deviation of 100 GPS pulse per second (PPS)s less than the indignant rate of 15nS (promptly 0.15 crystal oscillator oscillation period) is: 0.9974.Under the normal condition, general average is in [2 ,+2] (unit is: crystal oscillator oscillation period) interval.When mean value in [2 ,+2] interval, and when non-vanishing, to the setting valve adjustment once, method of adjustment is that 10M adds mean value, operation one second (being that comparer produces pulsatile once output) under adjusted setting valve.Then, setting valve recalled to be 10M, 100 phase differential of continuous coverage are asked average, and are rounded again, adjust setting valve again one time by phase differential, and so repeatedly, the self-produced pulse per second (PPS) clock jitter that reaches output is not more than crystal oscillator oscillation period (0.1 μ S).
(5) analyze the rule that setting valve is adjusted, under certain external condition, the deviation of crystal oscillator is constant, every setting valve of adjusting once for M time of measuring, the size of adjusted value has certain rules, by the rule that CPU statistical study setting valve is adjusted, generally get: the rule of 20 adjustment before this is adjusted.For example the sequence of the adjustment of 20 times before this is adjusted is:
0,0,1,0,0,1,0,1,0,0,1,0,0,1,0,0,1,0,0,1
Then to be roughly the value of per twice adjustment be 0 to rule, ensuingly once is adjusted into 1.Can predict that according to this rule ensuing adjusted value sequence should be:
0,0,1,0,…
In above-mentioned (4), when the mean deviation of GPS pulse per second (PPS) and self-produced pulse per second (PPS) outside [2 ,+2] interval, then show it may is distortion of GPS pps pulse per second signal or plant failure, can not adjust setting valve by deviation in above-mentioned (4), and should adjust by the setting valve adjustment law of CPU memory.Like this, even under the condition of gps satellite step-out, still can guarantee to move 1 hour, deviation is not more than 1 μ S.
(6) in above-mentioned (5), there is a section particular time: in initial a period of time of the synchronous high precision clock electrifying startup of GPS operation (after for example powering on 0～15 minute), because the self-produced pulse per second (PPS) of crystal oscillator and GPS pulse per second (PPS) are not synchronously as yet, the GPS receiver may the non-locking gps satellite, also may the constant-temperature high-precision crystal oscillator stable as yet, the mean deviation that causes GPS pulse per second (PPS) and self-produced pulse per second (PPS) is outside [2 ,+2] interval.But at this particular time, still adopt the mean deviation of GPS pulse per second (PPS) and self-produced pulse per second (PPS) to adjust setting valve, after self-produced pulse per second (PPS) and GPS pulse per second (PPS) synchronously, enter normal running status again.
3. realize that the record trouble that requires in 1 starts the method for correct time
When the fault initiating signal occurred, tracer signal went out the correct time of now, can be applicable to the row pitch of waves from aspects such as protection, localization of fault.
(1) from the input signal of current transformer, voltage transformer (VT) behind differential, extract row wave-wave head process varying signal.Signals such as row wave-wave head process varying signal and switch changed position mutually or the generation enabling signal.
(2) during enabling signal, read the date Hour Minute Second clock scale of self-produced pps pulse per second signal being counted, being handled and generates by CPU.
(3) after enabling signal occurs, read second following scale of producing by the fault initiating signal of phase detector record and the phase differential of self-produced pps pulse per second signal.
4. realize 1 the synchronous transient state waveform recording of a kind of GPS device
The synchronous transient state waveform recording of GPS device is made up of the synchronous high precision clock generator of GPS, part of data acquisition and microcomputer etc.GPS synchronous high-speed data acquisition system (DAS) has " collection " and " read-write " two kinds of working methods.At ordinary times, system is in " collection " data wait startup triggering state.At this moment, system carries out data acquisition automatically under the control of hardware logic electric circuit, refreshes card and goes up data in the storer, need not CPU and intervenes.After one or more trigger pips arrived, system can write down the accurate moment of triggering, after one piece of data is gathered in time-delay then, stopped to gather " read-write " mode that changes over to automatically.Under " read-write " mode CPU with the data conversion storage on the storer in internal memory.And then start-up system enters " collection " state, the next arrival that starts triggering of wait.Fault initiating precise time is constantly read by method in above-mentioned 2, the length of recorder data file (comprising starting data length before triggering, starting the data length after triggering) by the capacity of storer, start back time-delay record data length etc. decision be set.Therefore the position of start-up point in the recorder data file determined, can be obtained the accurate moment of each the data correspondence in the recorder data file by the moment of start-up point.Like this, the different pieces of information file that the strange land is measured can pass through the time scale registration, the size that reflects synchronization different location, unlike signal, and can be reflected in the situation of change of different location in the same time period, unlike signal, can be used for the analysis of transient state process of electric power system or other industry synchro measure to the strange land signal.
The high-precise synchronization clock accuracy that adopts this transient state process synchronous recording method to obtain: when the GPS receiver was working properly, synchronous error was less than 0.1 μ S; Under 1 hour situation of GPS receiver work step-out, can guarantee that synchronous error is less than 1 μ S.The high speed acquisition system performance index of this transient state process synchronous recording device: 6 passages, AD sample frequency are 5MHz, and precision is 12, can preserve the data of 0.2S before and after starting.Like this, can satisfy the requirement of transient state process of electric power system being carried out strange land synchronous high-speed sample record, also can satisfy other industry various signals strange land high-speed synchronous Testing requirement.
The present invention is further detailed explanation below in conjunction with accompanying drawing and specific implementation method.In the accompanying drawing:
The synchronous transient state waveform recording of Fig. 1: GPS device hardware block diagram;
The synchronous transient state waveform recording of Fig. 2: GPS device software main program block diagram;
The self-produced pulse per second (PPS) interrupt routine of the synchronous transient state waveform recording of Fig. 3: GPS device block diagram;
The synchronous transient state waveform recording of Fig. 3: GPS plant failure starts the interrupt routine block diagram.
Referring to Fig. 1, the synchronous transient state waveform recording of GPS device is made up of the synchronous high precision clock generator of GPS, high-speed data acquisition part and microcomputer etc.
The synchronous high precision clock generator of GPS comprises compositions such as GPS receiver 1, phase detector 2,24 digit counters 6, comparer 7 and 10MHz constant-temperature high-precision crystal oscillator 10.10MHz constant-temperature high-precision crystal oscillator 10 produces the 10MHz oscillator signal, and through 24 digit counters, 6 countings, count results and setting valve relatively when the two is consistent, produce pulse signal output, promptly self-produced pulse per second (PPS) 17 signals.GPS receiver 1 produces GPS pulse per second (PPS) 16 signals, GPS pulse per second (PPS) 16 signals and self-produced pulse per second (PPS) 17 signals are measured the two phase differential 18 by phase detector 2, deliver to CPU15 and read phase differential, ask average, CPU15 adjusts setting valve according to mean value, the general span of setting valve: [10M-2,10M+2], eliminate the Accumulated deviation of self-produced pulse per second (PPS) by adjusting setting valve, the deviation that makes self-produced pulse per second (PPS) is less than 0.1 μ S.
High-speed data acquisition part is by 10MHz constant-temperature high-precision crystal oscillator 10, two-divider 5, AD sampling 8, storer 3, interface unit 14, differentiating circuit 11 or door 12, second phase detector 13, counting delay unit 9, form with door 4 etc.The 10MHz oscillator signal that the high speed acquisition part is produced by 10MHz constant-temperature high-precision crystal oscillator 10 produces the AD sampled signal 19 of 5MHz behind two-divider 5 frequency divisions, control AD sampling 8 and storer 3 continuous samplings, circulation storage.When fault takes place, curtage signal 20 produces the transient state sudden change through differentiating circuit 11, the perhaps displacement signal 21 of switching manipulation, warp or door 12 produce the phase differential of enabling signal 22, the second phase detectors, 13 record enabling signals 22 and self-produced pulse per second (PPS) 17, it is the second following scale in the moment of enabling signal appearance, to self-produced pulse per second (PPS) counting generated by CPU15 with high scale second, and enabling signal interrupts of CPU 15 reads this startup constantly.Enabling signal is also passed through 9 time-delays of counting delay unit after 0.1 second, by with the AD sampled signal 19 of door 4 shielding 5MHz, stop sampling, storer 3 enters " read states ", is read the temporal variations process of the startup front and back of storer 3 records by interface unit 14 by CPU15.Read finish after, recover continuous sampling, the circulation storage is waited for next time starting.
Microcomputer is finished the Detection ﹠ Controling function, software such as Fig. 2, Fig. 3 and shown in Figure 4.Fig. 2 provides main program block diagram, after the start, delays time 15 minutes, and under the pattern of stationkeeping, general GPS receiver can enter steady-working state.To self-produced clock initialization, require GPS pulse per second (PPS) and self-produced pulse per second (PPS) synchronous, when the two is asynchronous, adjust setting valve, time-delay is waited for, till synchronously.Then, open interruption, whether cycle detection has the sign of startup to produce.When starting generation, delayed time 0.1 second, the temporal variations process has write down and has finished, stopped sampling before and after guaranteeing to start, and CPU reads the Temporal Data of storer record.Then, recover continuous sampling, circulation storage, and carry out fault handling, after finishing dealing with, come back to the start detection state, wait for the arrival of enabling signal next time.
Fig. 3 provides the trimming process of self-produced pulse per second (PPS).When self-produced pulse per second (PPS) occurs, produce self-produced pulse per second (PPS) and interrupt, the accumulative total pulse per second (PPS) generates date Hour Minute Second clock, and counter S is added 1, when counter S is 1, shows: just self-produced pulse per second (PPS) was carried out once adjusting, and must recall to 10M to setting valve.When S=M (continuously operation M second), need once adjust self-produced pulse per second (PPS), eliminate Accumulated deviation, to M phase differential ε that averages, drop on as ε in the scope of [2 ,+2], show that the work of GPS receiver is normal substantially, adjusting a setting valve is (10M+ ε), eliminating the Accumulated deviation of self-produced pulse per second (PPS), and 20 times adjustment law before the statistics; And drop on outside the scope of [2 ,+2] as ε, show that the GPS receiver may work undesiredly, can not adjust setting valve by ε, but adjust by statistical law.After the setting valve adjustment is finished, counter S zero clearing, and interrupt returning.
Fig. 4 provides and starts the interrupt routine block diagram.When enabling signal occurs, produce to start and interrupt, record starts constantly, puts to start sign, and interrupts returning.
Claims (4)
1. the synchronous recording method of a temporal variations process comprises the steps:
(1) produces high precision clock by the synchronous GPS of high precision constant temperature crystal oscillator (hereinafter to be referred as " GPS ");
(2) drive high-speed AD continuous sampling by high precision constant temperature crystal oscillator, the circulation storage refreshes card and goes up data in the storer; When having enabling signal to occur, read previous step rapid in the time value of high precision clock, gather a period of time by the setting valve time-delay that is provided with after, CPU with the data conversion storage on the storer in internal memory;
(3) preservation starts the data of front and back, and the generation moment of each data correspondence is by the startup moment and the position calculation of these data in data file of the rapid middle record of previous step;
(4) a plurality of pen recorders by the time scale registration, reflect the size of synchronization different location, unlike signal at the different local different pieces of information files of measuring, and are reflected in the situation of change of different location, unlike signal in the same time period.
2. according to the described synchronous recording method of claim 1, realize gathering the synchronous high precision clock of GPS of synchronizing function, the self-produced pps pulse per second signal that obtains by high precision crystal oscillator output signal frequency division, the pps pulse per second signal of self-produced pps pulse per second signal and GPS through phase detector relatively, obtain the phase deviation of the two, the self-produced pps pulse per second signal of mean value correction according to phase error, to eliminate the deviation that gps clock causes because of selectivity interference, satellite losing lock etc. and the Accumulated deviation of crystal oscillator, improve self-produced pps pulse per second signal precision, its step is as follows:
(1) correction of the frequency division of crystal oscillator output signal and self-produced pps pulse per second signal is finished by counter and comparer; The crystal oscillator outputting oscillation signal is added up by counter, and accumulation result and CPU setting valve through comparer relatively when count results is consistent with setting valve, produce and output one-second burst signal, and reset counter;
(2) correction of self-produced pps pulse per second signal is finished by the adjustment to setting valve, is promptly revised by microprocessor CPU and sends into the setting valve that comparer compares and finish; Desirable setting valve is the oscillation frequency value of crystal oscillator, and for eliminating the Accumulated deviation of crystal oscillator, setting valve is adjusted one time in every measurement M time; Promptly rounding definite value usually is the oscillation frequency value of crystal oscillator, and the phase differential of M GPS pulse per second (PPS) of continuous recording and self-produced pulse per second (PPS) is averaged and rounded; When mean value is non-vanishing, adjust one time setting valve; Method of adjustment is: if during the leading self-produced pulse per second (PPS) of GPS pulse per second (PPS), setting valve deducts mean value; And when if the GPS pulse per second (PPS) falls behind self-produced pulse per second (PPS), then setting valve adds mean value; Adopt adjusted setting valve, operation one-period, comparer produce pulse per second (PPS) output; Then, immediately setting valve is re-set as the oscillation frequency value of crystal oscillator, M phase differential of continuous coverage adjusted setting valve one time again by phase differential mean value, so repeatedly, produces high-precision self-produced pulse per second (PPS) clock.
(3) under the normal condition, setting valve is adjusted according to the mean value of the pps pulse per second signal phase differential of self-produced pps pulse per second signal and GPS; And when distortion of GPS pps pulse per second signal or plant failure, setting valve is adjusted according to the rule of the adjustment of setting valve in the past of computer statistics.
3. according to the described synchronous recording method of claim 1, when enabling signal occurred, tracer signal went out the correct time of now, and to be used for traveling-wave protection and localization of fault, it realizes that the record enabling signal goes out the method for now and is characterised in that:
When (1) enabling signal occurs, read the date Hour Minute Second clock scale of self-produced pps pulse per second signal being counted, being handled and generates by CPU;
(2) after enabling signal occurs, read by the fault initiating signal of phase detector record and the phase differential of self-produced pps pulse per second signal and produce the second following scale that generates.
4. the synchronous recording device of a temporal variations process is made up of the synchronous high precision clock generator of GPS, high-speed data acquisition part and microcomputer, is characterised in that:
The synchronous high precision clock generator of GPS comprises compositions such as GPS receiver 1, phase detector 2,24 digit counters 6, comparer 7 and 10MHz constant-temperature high-precision crystal oscillator 10; 10MHz constant-temperature high-precision crystal oscillator 10 produces the 10MHz oscillator signal, and through 24 digit counters, 6 countings, count results and setting valve relatively when the two is consistent, produce pulse signal output, promptly self-produced pps pulse per second signal 17.GPS receiver 1 produces GPS pulse per second (PPS) 16 signals, GPS pulse per second (PPS) 16 signals and self-produced pulse per second (PPS) 17 signals are measured the two phase differential 18 by phase detector 2, deliver to CPU15 and read phase differential, ask average, CPU15 adjusts setting valve according to mean value, the general span of setting valve: [10M-2,10M+2], eliminate the Accumulated deviation of self-produced pulse per second (PPS) by adjusting setting valve, the deviation that makes self-produced pulse per second (PPS) is less than 0.1 μ S;
High-speed data acquisition part is by 10MHz constant-temperature high-precision crystal oscillator 10, two-divider 5, AD sampling 8, storer 3, interface unit 14, differentiating circuit 11 or door 12, second phase detector 13, counting delay unit 9, form with door 4 etc.The 10MHz oscillator signal that the high speed acquisition part is produced by 10MHz constant-temperature high-precision crystal oscillator 10 produces the AD sampled signal 19 of 5MHz behind two-divider 5 frequency divisions, control AD sampling 8 and storer 3 continuous samplings, circulation storage; When fault takes place, curtage signal 20 produces the transient state sudden change through differentiating circuit 11, the perhaps displacement signal 21 of switching manipulation, warp or door 12 produce the phase differential of enabling signal 22, the second phase detectors, 13 record enabling signals 22 and self-produced pulse per second (PPS) 17, it is the second following scale in the moment of enabling signal appearance, generated by self-produced pulse per second (PPS) counting with high scale second, and the enabling signal interrupts of CPU reads this startup constantly.Enabling signal and by the time-delay of counting delay unit 9 after 0.1 second, by with the AD sampled signal 19 of door 4 shielding 5MHz, stop sampling, storer enter " read states ", read the transient state waveform before and after the startup of storer record by interface unit 14 by CPU15; Read finish after, recover continuous sampling, wait for next time starting.
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2000
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