CN108445279A - Based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector - Google Patents
Based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector Download PDFInfo
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- CN108445279A CN108445279A CN201810144061.3A CN201810144061A CN108445279A CN 108445279 A CN108445279 A CN 108445279A CN 201810144061 A CN201810144061 A CN 201810144061A CN 108445279 A CN108445279 A CN 108445279A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to intelligent power distribution net fields, it is related to relevant mechanics of communication in recording type fault detector, more particularly to based on the wireless synchronous sampling method of short frequency in a kind of transient state recording type fault detector, start the collecting unit in three-phase line, collect unit and sends synchronous clock synchronization order to collecting unit, include clock synchronization label in clock synchronization order simultaneously, corresponding absolute time can be found according to this label by collecting unit；Collecting unit receives clock synchronization order, does benefit point according to timing acquiring Counter Value and clearing is handled, so that it is eliminated the error that crystal oscillator is brought, keep three-phase synchronous acquisition.The scheme of the invention realizes that circuit collects the interaction of unit and collecting unit and not only reduces the power consumption of equipment using wireless communication technique and synch command, saves hardware cost, relaxes the precision to crystal oscillator and stability requirement.And it ensure that the synchronized sampling between line status monitor.
Description
Technical field
The invention belongs to intelligent power distribution net fields, are related to relevant mechanics of communication in recording type fault detector, especially
It is related in a kind of transient state recording type fault detector based on the wireless synchronous sampling method of short frequency.
Background technology
With the development of intelligent distribution network, intelligent power distribution cable line state monitors system by effectively being supervised to circuit
Survey, so can accurate judgement, be accurately positioned line fault, become to improve the development that O＆M overhaul efficiency is intelligent distribution network
Gesture.
At present in intelligent distribution network transient state recording type fault detector common demands to three-phase electricity synchronize in real time monitoring adopt
Sample, judgement and positioning to the validity and line fault of monitoring etc. are all significant.Now more common has two
Kind scheme：
Scheme one：Ac electric synchronous acquisition based on time tag.When the serial ports that the program is sent out based on GPS receiver plate
Between information and lock-out pulse, the real-time clock of entire monitoring system is established in monitoring system, monitoring system can be when arbitrary
Carve the system time for reading state monitor.The advantages of program be can ensure it is integer-period sampled, when system frequency is floated
It when shifting, also can change sample frequency automatically according to phaselocked loop, ensure the identical points of each period averaged acquisition；The disadvantage is that
Transmission contains much information, and when transmitting sampling point information, needs to transmit its corresponding time tag, keeps data processing more multiple
It is miscellaneous, and when large error occurs in software clock, the inaccuracy of clock can cause the failure of synchronized sampling, in addition, because each
Phase line state monitor will have GPS receiver device, increase hardware cost.
Scheme two：Ac electric synchronous acquisition based on absolute time.The program is based on GPS clock synchronizations and high-precision stabilization
Oscillating circuit ensures that all line status monitors all start to be sampled according to same frequency in synchronization.The program
The advantages of be the accumulated error that can be eliminated crystal oscillator and bring, compare the first scheme, the data volume of transmission is relatively small；The disadvantage is that
GPS clock synchronization power consumptions are bigger, and each phase line state monitor will have GPS receiver device and need high-precision crystal oscillator,
Increase hardware cost.
Invention content
The present invention is directed to above-mentioned problem, provides one kind in intelligent power distribution net in transient state recording type fault detector
Technology realizes the time synchronization between circuit collecting unit by radio communication, and then realizes three-phase monitoring current and monitoring voltage
The processing method of the synchronous acquisition of information and synchronous recording, i.e., based on the wireless synchronization of short frequency in transient state recording type fault detector
The method of sampling.
In order to achieve the above object, the technical solution adopted by the present invention is,
Based on the wireless synchronous sampling method of short frequency in a kind of transient state recording type fault detector, which is characterized in that
Start the collecting unit in three-phase line, collects unit and send synchronous clock synchronization order to collecting unit, together
When clock synchronization order in include clock synchronization label, corresponding absolute time can be found according to this label by collecting unit；
Collecting unit receives clock synchronization order, does benefit point according to timing acquiring Counter Value and clearing is handled, make
It eliminates the error that crystal oscillator is brought, and keeps three-phase synchronous acquisition；The collection point of three-phase collecting unit simultaneously
Number it is one-to-one, any two-phase collecting unit can be according to the acquisition period of another phase at clock synchronization interval
Inside find the collection point at corresponding moment；
The absolute time is handled：
The absolute time for sending the clock synchronization tab command moment can be recorded by collecting while unit sends clock synchronization label
T1；Because of framing frame decoding and the wireless Transceiver Features of of short frequency itself, the time when sending clock synchronization order
Postpone Δ t1 to just very existence time is sent out without bundle of lines clock synchronization order by short frequency；Collecting unit needs
Absolute time can be any moment, therefore the absolute time for only collecting unit record can not expire
Requirement of the foot to absolute time, this just needs the cooperation of relative time in collecting unit；
Collecting unit timer time T2 be record relative time, collect unit transmission clock synchronization order to
Collecting unit really receives the time for collecting unit transmission clock synchronization order because of air transmission and reception solution
The process existence time delay Δ t2 of frame；Collecting unit receives the clock synchronization order for collecting unit, and acquisition is single
The timer of member resets while preserving this clock synchronization label；When collecting unit needs the exhausted of a certain moment
When to the time, collecting unit is clock synchronization label, timer value T2 and time delay error delta t2 this moment
It is transmitted to and collects unit, collecting the absolute time that unit can then be calculated this moment by these information is：
T=T1+ Δ t1+T2+ Δs t2.
Preferably, the benefit point and clearing processing are respectively：
It resetting, the interval that will send synchronous clock synchronization order is defined as T1, when monitor receives synchronous clock synchronization order,
Counter O reset to timing acquiring device, it is T2 that synchronous clock synchronization command definition will not be received in the time,
Exception when monitor can report monitoring terminal-pair；
Point is mended, t1 will be defined as to the maximum time error that can be kept at present in constant duration, when receiving
The Counter Value of acquisition timer is defined as t2 when synchronous clock synchronization order, works as t2>When t1, acquisition timing
The time of device must be lag, if to be reset at this time to timer, monitor will acquisition one less
A point, it would be desirable to a point is mended to it, the point calculating process mended is as follows,
The point acquired when if resetting is sin (θ), and it is sin (θ-Δ θ) to reset the point acquired before, then resetting it
The point that should be mended afterwards is sin (θ+Δ θ), and wherein Δ θ is the equal angular sampling interval, then
sin(θ-Δθ)+sin(θ+Δθ)
=sin (θ) cos (Δ θ)+cos (Δ θ) sin (θ)+sin (θ) cos (Δ θ)-cos (Δ θ) sin (θ)
=2*sin (θ) cos (Δ θ)
Sin (θ+Δ θ)=2*sin (θ) cos (Δ θ)-sin (θ-Δ θ)
Obtain mending the size of point value.
Preferably, three-phase acquisition period corresponds, collecting unit timing acquiring data in Interruption work as acquisition
When unit receives clock synchronization order, corresponding acquisition period does clearing processing, and it is preferential with Sampling interrupt to consider that clock synchronization is interrupted
Grade problem, simple clearing processing do not ensure that the consistency of clock synchronization label, and it is fixed according to acquisition when receiving clock synchronization order to need
When device count value t2 determine that the value of collection point number record of lower a moment is after current clock synchronization in the period or because right
When interrupt before the current clock synchronization for also having not enough time to processing in the period；Its process is：
If collecting unit count value is t2 when receiving clock synchronization order, acquisition period value calculates during timing acquiring is interrupted
When collecting unit count value be t3, then work as t2<The acquisition label of t3, lower a moment are not processed.
Preferably, during clearing, because multiple monitors receive clock synchronization order and simultaneously to acquisitions
Device is reset simultaneously, so the information time of monitor acquisition is synchronous.
Preferably, based on synchronous acquisition information time, corresponding processing is done to acquisition period at the clock synchronization moment, makes three
The acquisition period of phase collecting unit synchronization is one-to-one, and any two-phase collecting unit can acquire single according to an other phase
The period of member record sampled point finds the data at corresponding moment.
Preferably, the unit that collects in transient state recording type fault detector can be according to clock synchronization label and collecting unit record
Relative time obtain collecting unit need absolute time and absolute time accuracy can reach us grades.
Preferably, the transient state recording type fault detector collects unit by one and three collecting units are constituted, respectively
It is communicated based on wireless communication technique between a equipment.
Compared with prior art, the advantages and positive effects of the present invention are,
1, it is middle using GPS clock synchronizations and high-precision mainly to solve the prior art (second scheme in background technology) for the invention
The stabilization oscillating circuit that crystal oscillator is constituted is spent to ensure that all line status monitors all start in synchronization according to same frequency
Rate carries out sampling and ensures the larger problem of data synchronization scheme power consumption.The present invention proposes a kind of synchronization based on short frequency wireless interaction
Scheme is not based entirely on GPS clock synchronizations, and of less demanding to the precision and degree of stability of crystal oscillator, and the program not only expands
The range of crystal oscillator, and reduce equipment power dissipation；
2, the synchronizing process of the invention is based on wireless communication technique and synch command, need not be sent in interactive process big
The data of amount, under the premise of satisfaction can eliminate the accumulated error that crystal oscillator is brought, wireless power consumption is much smaller compared to GPS,
In addition, the time periodically sent in interactive process can be arranged according to the precision and degree of stability of crystal oscillator, this is eliminated to crystal oscillator
The limitation of selection；
3, the scheme of the invention realizes that circuit collects the friendship of unit and collecting unit using wireless communication technique and synch command
The power consumption for mutually not only reducing equipment, saves hardware cost, relaxes the precision to crystal oscillator and stability requirement.And ensure
Synchronized sampling between line status monitor.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, for ability
For the those of ordinary skill of domain, without having to pay creative labor, others are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the work of the interactive process based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector
Principle schematic；
Fig. 2 is the structural schematic diagram of transient state recording type fault detector；
Fig. 3 is the operation principle schematic diagram of transient state recording type fault detector.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawings and examples
The present invention will be further described.It should be noted that in the absence of conflict, in embodiments herein and embodiment
Feature can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
With using implementing different from other modes described here, therefore, the present invention is not limited to the specific of specification is described below
The limitation of embodiment.
Embodiment 1, as shown in Figure 1, Figure 2, Figure 3 shows, the present invention provides be based in a kind of transient state recording type fault detector
The synchronous sampling method that short frequency is wireless, i.e., a kind of synchronization scheme based on short frequency wireless interaction, is not based entirely on GPS clock synchronizations,
And it is of less demanding to the precision and degree of stability of crystal oscillator, the program not only expands the range of crystal oscillator, but also reduces equipment
Power consumption.
In transient state recording type fault detector, need 3 collecting units to electrical to obtain accurate zero-sequence current
Amount is synchronized sampling.
In order to ensure that the acquisition time between collecting unit synchronizes, using wireless communication technique, it is periodic to collect unit
The synchronization clock synchronization order with clock synchronization label is sent to collecting unit, when monitor receives clock synchronization order, to the acquisition time of itself
It does and adjusts accordingly and preserve the clock synchronization label this time received.It, can be with when collecting unit and calling acquisition information to collecting unit
The clock synchronization label and call duration time preserved according to collecting unit obtains the absolute time that collecting unit acquires information.Its interactive process
As shown in Figure 1
Wherein T1 indicates the interval of the synchronous clock synchronization order of transmission, and specific size is related with the precision of equipment timer, when
Monitor receives synchronous clock synchronization order, the counter O reset to timing acquiring device.Because multiple monitors receive clock synchronization life simultaneously
It enables and collector is reset simultaneously, so the information time of monitor acquisition is synchronous；T2 indicates not receiving in the time same
Walk clock synchronization order, exception when monitor can report monitoring terminal-pair.
If t1 indicates that in constant duration, t2, which indicates to work as, receives synchronous clock synchronization to the maximum time error that can be kept at present
The Counter Value that timer is acquired when order, based on above-mentioned condition it is found that working as t2>When t1, the time of the acquisition timer is certain
It is lag, if to be reset at this time to timer, monitor will acquire a point less, it would be desirable to a point is mended to it,
The point calculating process mended is as follows：
The point acquired when if resetting is sin (θ), and it is sin (θ-Δ θ) to reset the point acquired before, then being answered after resetting
The point of the benefit is sin (θ+Δ θ), and wherein Δ θ is the equal angular sampling interval, then
sin(θ-Δθ)+sin(θ+Δθ)
=sin (θ) cos (Δ θ)+cos (Δ θ) sin (θ)+sin (θ) cos (Δ θ)-cos (Δ θ) sin (θ)
=2*sin (θ) cos (Δ θ)
Sin (θ+Δ θ)=2*sin (θ) cos (Δ θ)-sin (θ-Δ θ)
By above-mentioned formula, we can obtain mending the size of point value.
Three-phase acquires period and corresponds, collecting unit timing acquiring data in Interruption, when collecting unit receives
To when clock synchronization order, corresponding acquisition period does clearing processing, considers that clock synchronization interrupts the issue of priority with Sampling interrupt, letter
Single clearing processing does not ensure that the consistency of clock synchronization label, needs the counting according to acquisition timer when receiving clock synchronization order
Value t2 determines that the value of collection point number record of lower a moment is after current clock synchronization in the period or because is interrupted also not by clock synchronization
It is in time for before the current clock synchronization of processing in the period.Its process is：
If collecting unit count value is t2 when receiving clock synchronization order, acquired when acquisition period value calculates during timing acquiring is interrupted
Element count value is t3, then works as t2<The acquisition label of t3, lower a moment are not processed.
With reference to Fig. 2 and Fig. 3, present invention is described.
Fig. 2 shows that transient state recording type fault detector collects unit by one and three collecting units are constituted, Ge Geshe
It is communicated based on wireless communication technique between standby.It is difficult to ensure that being the same, so adopting at the time of three-phase line collecting unit starts
The collection moment cannot be ensured of synchronous acquisition；Secondly there is also errors for the oscillating circuit that crystal oscillator is constituted, and such as handle not in time, error
It can be accumulated, can not ensure three-phase line state monitor synchronous acquisition.After three-phase line collecting unit starts, collect unit
Synchronous clock synchronization order is sent to collecting unit, while including clock synchronization label in clock synchronization order, collecting unit can look for according to this label
To corresponding absolute time.Collecting unit receives clock synchronization order, does benefit point according to timing acquiring Counter Value and clearing is handled,
So that it is eliminated the error that crystal oscillator is brought, keeps three-phase synchronous acquisition.Based under this background, it is assumed that A phases are abnormal, and are being opened
B, C two-phase are notified while dynamic recording.When B, C two-phase receive the order of synchronous averaging recording and are opened according to synchronizing of sending of A phases
Dynamic recording point calculates A phases and starts the recording moment, is thus avoided that because the reasons such as communication cause B, C phase start delay, protects
It has demonstrate,proved three-phase synchronous and has started recording, as shown in Figure 3.Startup can be calculated according to the clock synchronization label for starting the recording moment by collecting unit
The absolute time at recording moment.
This patent it is main it is outstanding be absolute time processing, that is, collecting while unit sends clock synchronization label can record
Send the absolute time T1 at clock synchronization tab command moment.Because framing frame decoding and the wireless Transceiver Features of of short frequency itself, work as transmission
Time when clock synchronization order postpones Δ t1 to just very sending out existence time without bundle of lines clock synchronization order by short frequency.Collecting unit needs
The absolute time wanted can be any moment, therefore the absolute time for only collecting unit record can not meet to absolute time
Requirement, this just needs the cooperation of relative time in collecting unit.Collecting unit timer time T2 be record it is opposite when
Between, the clock synchronization order for collecting unit transmission really receives the time for collecting unit transmission clock synchronization order to collecting unit because aerial
Transmission and the process existence time delay Δ t2 for receiving frame decoding.Collecting unit receives the clock synchronization order for collecting unit, and acquisition is single
The timer of member resets while preserving this clock synchronization label.When collecting unit needs the absolute time at a certain moment, acquisition
Unit is transmitted to clock synchronization label, timer value T2 and time delay error delta t2 this moment to collect unit, and collecting unit can then lead to
Crossing the absolute time that these information calculate this moment is：
T=T1+ Δ t1+T2+ Δs t2 wherein Δ t1 can be sent completely mark by sending the clock synchronization order moment and receiving
The time difference at will position moment obtains；Δ t2 can be according to the data length of transmission, wireless air transfer rate and reception frame decoding
Time be calculated.
Based on synchronous acquisition information time, corresponding processing is done to acquisition period at the clock synchronization moment, keeps three-phase acquisition single
The acquisition period of first synchronization is one-to-one, and any two-phase collecting unit can be recorded according to other phase collecting unit and be adopted
The period of sampling point finds the data at corresponding moment.
Collecting in transient state recording type fault detector, unit can record according to clock synchronization label and collecting unit it is opposite when
Between obtain collecting unit need absolute time and absolute time accuracy can reach us grades.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but it is every without departing from technical solution of the present invention content, according to the technical essence of the invention
To any simple modification, equivalent variations and remodeling made by above example, the protection domain of technical solution of the present invention is still fallen within.
Claims (6)
1. based on the wireless synchronous sampling method of short frequency in a kind of transient state recording type fault detector, which is characterized in that
Start the collecting unit in three-phase line, collects unit and send synchronous clock synchronization order, while clock synchronization order to collecting unit
In include clock synchronization label, corresponding absolute time can be found according to this label by collecting unit；Collecting unit receives clock synchronization order,
Benefit point and clearing processing are done according to timing acquiring Counter Value, so that it is eliminated the error that crystal oscillator is brought, keeps three-phase synchronous acquisition；
The acquisition period of three-phase collecting unit is one-to-one simultaneously, and any two-phase collecting unit can be according to the acquisition period of another phase
The collection point at corresponding moment is found in clock synchronization interval；
The absolute time is handled：
The absolute time T1 for sending the clock synchronization tab command moment can be recorded by collecting while unit sends clock synchronization label；Because of framing
Frame decoding and the wireless Transceiver Features of of short frequency itself, the time when sending clock synchronization order is to just very by short frequency without bundle of lines clock synchronization life
Order sends out existence time delay Δ t1；
Collecting unit timer time T2 is the relative time recorded, and the clock synchronization order for collecting unit transmission is true to collecting unit
The time for collecting unit transmission clock synchronization order is just being received because of air transmission and the process existence time delay Δ of reception frame decoding
t2；Collecting unit receives the clock synchronization order for collecting unit, and the timer of collecting unit resets while preserving this clock synchronization label；
When collecting unit needs the absolute time at a certain moment, collecting unit is clock synchronization label, timer value T2 and the time this moment
Delay error Δ t2, which is transmitted to, collects unit, collects the absolute time that unit can then be calculated this moment by these information and is：
T=T1+ Δ t1+T2+ Δs t2.
2. based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector according to claim 1,
It is characterized in that, the benefit point and clearing processing are respectively：
It resets, the interval that will send synchronous clock synchronization order is defined as T1, when monitor receives synchronous clock synchronization order, to timing acquiring
The counter O reset of device, it is T2 that synchronous clock synchronization command definition will not be received in the time, when monitor can report monitoring terminal-pair
It is abnormal；
Point is mended, t1 will be defined as to the maximum time error that can be kept at present in constant duration, is ordered when receiving synchronous clock synchronization
The Counter Value that timer is acquired when enabling is defined as t2, works as t2>When t1, the time of the acquisition timer must be lag, such as
Fruit at this time will reset timer, and monitor will acquire a point less, it would be desirable to a point be mended to it, the point mended calculates
Process is as follows,
The point acquired when if resetting is sin (θ), and it is sin (θ-Δ θ) to reset the point acquired before, then should be mended after resetting
Point be sin (θ+Δ θ), wherein Δ θ be the equal angular sampling interval, then
sin(θ-Δθ)+sin(θ+Δθ)
=sin (θ) cos (Δ θ)+cos (Δ θ) sin (θ)+sin (θ) cos (Δ θ)-cos (Δ θ) sin (θ)
=2*sin (θ) cos (Δ θ)
Sin (θ+Δ θ)=2*sin (θ) cos (Δ θ)-sin (θ-Δ θ)
Obtain mending the size of point value.
3. based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector according to claim 2,
It is characterized in that, three-phase acquires period and corresponds, collecting unit timing acquiring data in Interruption, when collecting unit receives
To when clock synchronization order, corresponding acquisition period does clearing processing, considers that clock synchronization interrupts the issue of priority with Sampling interrupt, letter
Single clearing processing does not ensure that the consistency of clock synchronization label, needs the counting according to acquisition timer when receiving clock synchronization order
Value t2 determines that the value of collection point number record of lower a moment is after current clock synchronization in the period or because is interrupted also not by clock synchronization
It is in time for before the current clock synchronization of processing in the period；Its process is：
If collecting unit count value is t2, collecting unit when acquisition period value calculates during timing acquiring is interrupted when receiving clock synchronization order
Count value is t3, then works as t2<The acquisition label of t3, lower a moment are not processed.
4. based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector according to claim 3,
It is characterized in that, during clearing, because multiple monitors receive clock synchronization order simultaneously and to collector while resetting,
The information time of monitor acquisition is synchronous.
5. based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector according to claim 4,
It is characterized in that, based on synchronous acquisition information time, corresponding processing is done to acquisition period at the clock synchronization moment, keeps three-phase acquisition single
The acquisition period of first synchronization is one-to-one, and any two-phase collecting unit can be recorded according to other phase collecting unit and be adopted
The period of sampling point finds the data at corresponding moment.
6. based on the wireless synchronous sampling method of short frequency in transient state recording type fault detector according to claim 5,
Be characterized in that, the transient state recording type fault detector collects unit by one and three collecting units are constituted, each equipment it
Between based on wireless communication technique communicate.
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| CN109116187A (en) * | 2018-08-31 | 2019-01-01 | 东方电子股份有限公司 | A kind of recording synchronous method applied to transient state recording type fault detector |
| CN109298362A (en) * | 2018-09-10 | 2019-02-01 | 国网江苏省电力有限公司电力科学研究院 | A kind of distribution line failure indicator three-phase synchronous method for testing precision, device and system |
| CN110794195A (en) * | 2019-11-18 | 2020-02-14 | 北京煜邦电力技术股份有限公司 | Three-phase synchronous sampling method and device and storage medium |
| CN111398737A (en) * | 2020-04-08 | 2020-07-10 | 北京和信瑞通电力技术股份有限公司 | Recording management method and system applied to recording type fault indicator |
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| CN111579918A (en) * | 2020-04-13 | 2020-08-25 | 上海紫通信息科技有限公司 | Sampling synchronous correction method for transient recording type fault indicator |
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| CN112714459A (en) * | 2020-12-30 | 2021-04-27 | 石家庄科林电气股份有限公司 | Automatic frequency modulation method for fault indicator |
| CN113960413A (en) * | 2021-10-20 | 2022-01-21 | 石家庄科林电气股份有限公司 | Time synchronization method for collecting unit and collecting unit in fault indicator |
| CN114594669A (en) * | 2020-12-04 | 2022-06-07 | 青岛鼎信通讯股份有限公司 | Accurate synchronization method of transient recording type fault indicator |
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