CN111220878B - Synchronous wave recording method and device - Google Patents
Synchronous wave recording method and device Download PDFInfo
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- CN111220878B CN111220878B CN201911259993.3A CN201911259993A CN111220878B CN 111220878 B CN111220878 B CN 111220878B CN 201911259993 A CN201911259993 A CN 201911259993A CN 111220878 B CN111220878 B CN 111220878B
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- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The embodiment of the invention discloses a synchronous wave recording method and a synchronous wave recording device. The synchronous wave recording method comprises the following steps: after determining a line fault phase according to the fault request message, the collecting unit sends a fault synchronous time setting message to the three-phase acquisition unit in a broadcast mode, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase acquisition unit which is received firstly as the fault phase; the three-phase acquisition unit sends a fault information message to the collection unit according to the fault synchronous time synchronization message, the collection unit sends a calling wave recording data message to the three-phase acquisition unit, and each phase acquisition unit calls the wave recording data message according to the calling wave recording data message based on the time offset delta t1Calculating the initial time of each wave recording data, and sending the wave recording data synchronized with the initial sampling point to the collecting unit; the collecting unit receives the time difference delta t of each phase acquisition unit2And synchronizing the three-phase wave recording data. The embodiment of the invention realizes that the acquisition unit is locally synchronized first and the recording data of each phase are synchronized after the collection unit.
Description
Technical Field
The embodiment of the invention relates to the technical field of fault positioning, in particular to a synchronous wave recording method and device.
Background
In recent years, a large amount of funds are invested into a power distribution network by the nation to transform an urban network and a rural network, and a fault indicator is widely applied as one of power distribution fault positioning means.
In the prior art, the transient recording type fault indicator records and uploads power grid operation detail information during fault, in order to meet ultra-low power consumption and low cost, the transient recording type fault indicator is generally not provided with an independent clock chip, but a common clock crystal oscillator is adopted to maintain a local clock, and due to the fact that the crystal oscillator precision is not high, the phenomenon of random crystal oscillator phase deviation can occur along with the time, time deviation of each acquisition unit is caused, and the transient recording type fault indicator is low in synchronization precision and high in power consumption.
Disclosure of Invention
The embodiment of the invention provides a synchronous wave recording method and a synchronous wave recording device, which aim to solve the contradiction between the synchronous wave recording precision and the energy consumption of the device, ensure the accuracy of three-phase synthesized zero-sequence current and zero-sequence voltage and greatly improve the accuracy of judging ground faults.
In a first aspect, an embodiment of the present invention provides a synchronous wave recording method, where the synchronous wave recording method is executed by a synchronous wave recording device, the synchronous wave recording device includes a three-phase acquisition unit and a collection unit, the three-phase acquisition unit corresponds to a three-phase line one by one, and the three-phase acquisition unit is in wireless communication connection with the collection unit;
the synchronous wave recording method comprises the following steps:
after determining a line fault phase according to a fault request message, the collecting unit sends a fault synchronous time setting message to the three-phase acquisition unit in a broadcast mode, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase acquisition unit which is received firstly as the fault phase;
the three-phase acquisition unit sends a fault information message to the collection unit according to the fault synchronous time synchronization message, wherein the fault information message comprises a time offset delta t between the time when the fault phase receives the fault synchronous time synchronization message and the time when the fault occurs1And the time difference delta t between the time when the three-phase acquisition unit receives the collection synchronous frame and the last sampling time2；
After receiving the synchronous time synchronization confirmation frame of the three-phase acquisition unit, the collecting unit sends a wave recording calling data message to the three-phase acquisition unit, wherein each frame of data message contains the time offset delta t of the wave recording point to be called by the three-phase acquisition unit1；
Each phase acquisition unit is based on the time offset delta t according to the calling recorded wave data message1Calculating the initial time of each wave recording data and sending the wave recording data to the collecting unit；
The collecting unit is used for collecting the time difference delta t sent by each phase acquisition unit2And synchronizing the three phases of the wave recording data.
In a second aspect, an embodiment of the present invention further provides a synchronous wave recording device, where the synchronous wave recording device includes a three-phase acquisition unit and a collection unit, the three-phase acquisition unit corresponds to a three-phase line one to one, and the three-phase acquisition unit is in wireless communication connection with the collection unit;
the collecting unit is used for sending a fault synchronous time setting message to the three-phase acquisition unit in a broadcast mode after determining a line fault phase according to a fault request message, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase acquisition unit which is received firstly as the fault phase;
the three-phase acquisition unit is used for sending a fault information message to the collection unit according to the fault synchronous time synchronization message, wherein the fault information message comprises a time offset delta t between the time when the fault phase receives the fault synchronous time synchronization message and the time when the fault occurs1And the time difference delta t between the time when the three-phase acquisition unit receives the collection synchronous frame and the last sampling time2；
The collecting unit is used for sending a calling wave recording data message to the three-phase acquisition unit after receiving a synchronous time setting confirmation frame of the three-phase acquisition unit, and each frame of data message respectively contains the time offset delta t of a wave recording point to be called by the three-phase acquisition unit1；
Each phase acquisition unit is used for calling the recorded wave data message according to the calling and based on the time offset delta t1Calculating the initial time of each wave recording data, and sending the wave recording data to the collecting unit;
the collecting unit is used for collecting the time difference delta t sent by each phase acquisition unit2And synchronizing the three phases of the wave recording data.
In the embodiment of the invention, when a line fails, the collecting unit firstly receives the corresponding fault request message sent by the acquisition unitThe remaining two phases are non-faulted phases. The fault phase acquisition unit is used for calculating the time offset delta t between the time when the fault occurs and the synchronous time tick frame message sent by the collection unit1And the time difference delta t between the time when the three-phase acquisition unit receives the convergence synchronous frame and the last sampling time2The non-fault phase acquisition unit acquires the time offset delta t1And after the initial time of the wave recording data is adjusted, the wave recording data is sent to the collecting unit, so that the rough synchronization among the three-phase acquisition units is realized. After the collecting unit receives the wave recording data of all the acquisition units, the collecting unit sends the time difference delta t according to the acquisition units of all the phases2And synchronizing the three-phase wave recording data. The precision of the synchronous wave recording of the three-phase line is improved, the accuracy of the synthesized three-phase data is guaranteed, and the accuracy of the ground fault judgment is greatly improved.
Drawings
Fig. 1 is a flowchart of a synchronous recording method according to an embodiment of the present invention;
fig. 2 is a flowchart of another synchronous recording method according to an embodiment of the present invention;
fig. 3 is a flowchart of another synchronous recording method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a synchronous wave recording apparatus according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a synchronous recording according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another synchronous recording according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a synchronous wave recording method according to an embodiment of the present invention, where the method may be executed by a synchronous wave recording apparatus, the synchronous wave recording apparatus includes three-phase acquisition units and a collection unit, the three-phase acquisition units correspond to three-phase lines one to one, and the three-phase acquisition units are wirelessly connected with the collection unit.
Specifically, the synchronous wave recording device can be a transient wave recording type fault indicator composed of a three-phase acquisition unit and a collecting unit, and the transient wave recording type fault indicator records and uploads power grid operation information during fault by adding a wave recording function. The three-phase acquisition units are respectively in one-to-one correspondence with three-phase lines, for example, an A-phase acquisition unit corresponding to an A-phase line, a B-phase acquisition unit corresponding to a B-phase line, and a C-phase acquisition unit corresponding to a C-phase line, each phase acquisition unit is respectively installed on the corresponding line, the sampling period of the acquisition unit is set to 250 microseconds, and 4000 data points are sampled per second; the collecting unit may be mounted on a utility pole. After the collecting unit receives the wave recording data sent by the three acquisition units in the same group, the three-phase data are synthesized into wave recording data with zero-sequence transient current and uploaded to a power grid master station.
The synchronous wave recording method comprises the following steps:
and step 110, after determining the line fault phase according to the fault request message, the collecting unit sends a fault synchronous time setting message to the three-phase collecting unit in a broadcasting mode, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase collecting unit which is received firstly as the fault phase.
Specifically, the collecting unit is in wireless communication with the three-phase acquisition unit, and the collecting unit sends data information to each phase acquisition unit in a broadcast mode. When a three-phase line fails, the three-phase acquisition unit judges whether the corresponding line fails, and then sends a failure request message to the collection unit to request the collection unit to determine a failed phase line. Because the three-phase acquisition units send the fault request messages asynchronously, the time for the collection unit to receive the fault request messages sent by the three-phase acquisition units is different, so that the collection unit takes the line corresponding to the acquisition unit which receives the fault request message firstly as a fault phase and takes the other two phases as non-fault phases. For example, a three-phase acquisition sheetThe element respectively carries out fault judgment on respective lines, if an A-phase line in the three-phase line has a fault, the A-phase acquisition unit judges the A-phase fault and records the sampling times cnt1 of the current A-phase acquisition unitAAnd then sends a failure request message to the aggregation unit. If the phase-B line has a fault, the acquisition unit of the phase-B line also sends a fault request message to the collection unit, but because the collection unit receives the fault request message of the phase-A line first, the collection unit takes the phase-A line as a fault phase, and the phase-B line and the phase-C line are both taken as non-fault phases.
And after determining the fault phase, the collecting unit responds to the received fault request message and sends fault synchronous time synchronization messages to the three-phase acquisition units in a broadcasting mode. The fault synchronous time synchronization message contains synchronous time synchronization data, and each phase acquisition unit is required to perform synchronous time synchronization.
Specifically, after receiving the fault synchronization time setting message sent by the collecting unit, the three-phase collecting unit records the sampling times of the current time and the time difference Δ t between the current time and the previous time during sampling2And the acquisition unit of the fault phase calculates the time offset delta t between the current moment and the fault moment1. The three-phase acquisition unit respectively converts the time difference delta t2And time offset Δ t of the fault phase1And encapsulating to form a data block and sending the data block to the collecting unit through the fault information message. For example, the collecting unit determines that the a-phase line is a fault phase, and sends fault synchronization time-setting messages to the three-phase collecting units respectively, and the three-phase collecting units record current sampling times cnt2 of the three-phase collecting units respectivelyA、cnt2BAnd cnt2CAnd calculating the time difference delta t between the current time and the last sampling time2A＝tA2-tA1、Δt2B＝tB2-tB1And Δ t2C＝tC2-tC1. The A-phase acquisition unit calculates the time offset delta t between the current moment and the fault occurrence moment according to the current sampling times and the sampling times of the fault occurrence moment1A＝(cnt2A-cnt1A) X 250 mus, and the synchronization error is accurate to within 250 microseconds.
Specifically, the collection unit sends a fault synchronization time setting message to the three-phase acquisition unit, and the three-phase acquisition unit starts to record the current sampling times of the three-phase acquisition unit after receiving a fault synchronization time setting frame, wherein the fault synchronization time setting frame is contained in the fault synchronization time setting message. After the three-phase acquisition units record the data of the corresponding lines, the three-phase acquisition units send synchronous time synchronization confirmation frames to the collecting unit, after the collecting unit receives the synchronous time synchronization confirmation frames sent by all the acquisition units, the collecting unit starts to send calling wave recording data messages to the three-phase acquisition units in a broadcasting mode, and each calling wave recording data message respectively contains the time offset delta t of the wave recording data to be called by the three-phase acquisition units at a wave recording point1。
Step 140, each phase acquisition unit calls the recorded wave data message according to the time offset delta t1And calculating the starting time of the respective wave recording data, and sending the wave recording data to the collecting unit.
Specifically, the collecting unit sends calling and wave-recording data messages to the three-phase acquisition units respectively, and each phase acquisition unit receives the calling and wave-recording data messages and then carries out wave-recording data message calling and wave-recording according to the time offset delta t1And calculating the starting time of the respective recording data to transmit the recording data from the starting time. For example, the a-phase line is a fault phase, the collecting unit sends fault synchronization time-setting messages to the three-phase collecting units, and the three-phase collecting units record current sampling times cnt2 respectivelyA、cnt2BAnd cnt2CAnd the A-phase acquisition unit calculates the time offset delta t between the current moment and the fault occurrence moment according to the current sampling times and the sampling times of the fault occurrence moment1A＝(cnt2A-cnt1A) X 250 mus, and the synchronization error is accurate to within 250 microseconds. The three-phase acquisition unit respectively calculates the starting time of the wave recording data of the three-phase acquisition unit, and the starting time of the wave recording data of the line A is t3A＝cnt2A-Δt1AThe starting time of the B-phase line wave recording data is t3B＝cnt2B-Δt1AThe starting time of the C-phase line wave recording data is t3C＝cnt2C-Δt1A. Then each phase of acquisition unit forms recording data containing complete cycle waves and sends the recording data to the collecting unit.
Specifically, the collecting unit receives respective wave recording data sent by the three-phase acquisition unit and then sends the data according to the time difference delta t2A＝tA2-tA1、Δt2B＝tB2-tB1And Δ t2C＝tC2-tC1The three-phase data are synchronized by a Lagrange interpolation method, so that the three-phase data of the three-phase line are synthesized into accurate synchronous wave recording data with zero-sequence transient current, and the wave recording data comprise fault information of the line, data waveforms of the three-phase line and the like.
In the embodiment of the invention, when a line fails, the collecting unit takes the line corresponding to the failure request message sent by the collecting unit which is received firstly as a failure phase, and the other two phases are non-failure phases. The fault phase acquisition unit is used for calculating the time offset delta t between the time when the fault occurs and the synchronous time tick frame message sent by the collection unit1And the time difference delta t between the time when the three-phase acquisition unit receives the convergence synchronous frame and the last sampling time2The non-fault phase acquisition unit acquires the time offset delta t1After the initial time of the wave recording data is adjusted, the wave recording data is sent to the collecting unit, and the three-phase acquisition is realizedCoarse synchronization between elements. After the collecting unit receives the wave recording data of all the acquisition units, the collecting unit sends the time difference delta t according to the acquisition units of all the phases2And synchronizing the three-phase wave recording data. The precision of the synchronous wave recording of the three-phase line is improved, the accuracy of the synthesized three-phase data is guaranteed, and the accuracy of the ground fault judgment is greatly improved.
Optionally, the collecting unit uses a line corresponding to the fault request message sent by the first received three-phase collecting unit as a fault phase, and includes:
the three-phase acquisition units respectively send fault request messages to the collection unit, and record the current sampling times cnt1 of the acquisition units corresponding to the faults.
Specifically, when a three-phase line fails, the three-phase acquisition unit may determine whether the corresponding line fails, record the current sampling frequency cnt1, and then send a failure request message to the collection unit to request the collection unit to determine the failed phase line. Because the three-phase acquisition units send the fault request messages asynchronously, the time for the collection unit to receive the fault request messages sent by the three-phase acquisition units is different, so that the collection unit takes the line corresponding to the acquisition unit which receives the fault request message firstly as a fault phase and takes the other two phases as non-fault phases. For example, when the phase a line fails, the acquisition unit corresponding to the phase a line will determine the failure and record the current sampling number cnt1A, and then send a failure request message to the aggregation unit. At this time, the phase B line and the phase C line do not send the fault request message, so the collecting unit receives the fault request message of the phase a line first, that is, the phase a line is used as a fault phase, and the other two phases are used as non-fault phases. This has the advantage that synchronization between the acquisition units is facilitated.
Example two
Fig. 2 is a flowchart of another synchronous recording method according to an embodiment of the present invention, and with reference to fig. 2, on the basis of the above embodiment, the method specifically includes the following steps:
step 210, after determining the line fault phase according to the fault request message, the collecting unit sends a fault synchronization time setting message to the three-phase collecting unit in a broadcast mode, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase collecting unit which is received first as the fault phase.
The acquisition unit of the fault phase calculates the time offset delta t between the current moment and the fault occurrence moment1The three-phase acquisition unit sends a signal containing a time offset delta t1The fault information message sent by the three-phase acquisition unit also comprises a time difference delta t between the time of receiving the collection synchronous frame and the last sampling time2。
Specifically, after receiving the fault synchronization time setting message sent by the collecting unit, the three-phase collecting units all record the sampling times of the current time and the time difference Δ t between the current time and the previous time through the sampling point counters of the respective collecting units2And the acquisition unit of the fault phase calculates the time offset delta t between the current moment and the fault moment1. The three-phase acquisition unit respectively converts the time difference delta t2And time offset Δ t of the fault phase1And encapsulating to form a data block and sending the data block to the collecting unit through the fault information message. For example, the collecting unit determines that the a-phase line is a fault phase, and sends fault synchronization time-setting messages to the three-phase collecting units respectively, and the three-phase collecting units record current sampling times cnt2 of the three-phase collecting units respectivelyA、cnt2BAnd cnt2CAnd calculating the time difference delta t between the current time and the last sampling time2A＝tA2-tA1、Δt2B＝tB2-tB1And Δ t2C＝tC2-tC1. The A-phase acquisition unit calculates the time offset delta t between the current moment and the fault occurrence moment according to the current sampling times and the sampling times of the fault occurrence moment1. Wherein the time offset amount deltat1A＝(cnt2A-cnt1A) X 250 μ s based on the time offset Δ t1The synchronization error can be accurate to within 250 microseconds.
Step 230, after receiving the synchronous time tick confirmation frame of the three-phase acquisition unit, the convergence unit sends a wave recording calling data message to the three-phase acquisition unit, where each frame of data message includes a time offset Δ t of a wave recording starting point to be called by the three-phase acquisition unit1。
And step 240, each phase acquisition unit sends wave recording data containing at least 13 cycles to the collection unit based on the starting time of the respective wave recording data.
Specifically, the national standard stipulates that the recording file at least meets the data of 4 cycles before the fault and 8 cycles after the fault. After each phase acquisition unit receives the calling wave recording data message sent by the collecting unit, the time offset delta t is used for collecting the wave data message1And calculating the starting time of the respective wave recording data to determine the beginning of wave recording. Each phase acquisition unit takes the starting time of the recording data as a starting point, prepares the recording data of at least 13 cycles, packs and sends the recording data to the collection unit. For example, each phase acquisition unit may prepare 13 cycles of recording data, including 4.5 cycles before failure and 8.5 cycles after failure.
Specifically, the collecting unit receives respective wave recording data sent by the three-phase acquisition unit and then sends the data according to the time difference delta t2A＝tA2-tA1、Δt2B＝tB2-tB1And Δ t2C＝tC2-tC1Three-phase data are synchronized through a Lagrange interpolation formula, so that the three-phase data of the three-phase line are synthesized into accurate synchronous wave recording data with zero-sequence transient current, and the wave recording data comprise fault information of the line, data waveforms of the three-phase line and the like. Suppose the original sampling point in the recorded data is y (x)0)、y(x1)、y(x2)……y(xn) Wherein y (x)0)、y(x1) And y (x)2) Three consecutive sampling points, xnFor the sampling time of the nth sampling point, the sampling time interval of two adjacent sampling points is 250 microseconds, and then the lagrange interpolation formula can be expressed as follows:
illustratively, phase a line fails, and as can be seen from the above embodiments, x ═ Δ t2A. Changing x to delta t2ASubstituting into Lagrange interpolation formula, and then converting y (x) in original sampling point0)、y(x1) And y (x)2) Substituting into a Lagrange interpolation formula, and calculating to obtain a first sampling point y (x) of the A-phase acquisition unit after resampling0') and then sequentially substituting the other sampling points into a formula to calculate to finally obtain new recording data y (x)0’)、y(x1’)、y(x2’)……y(xn') and accurate synchronization of the three-phase synthesized waveform is achieved after resampling of the other two-phase acquisition units.
In the embodiment of the invention, when a line fails, the collecting unit takes the line corresponding to the failure request message sent by the collecting unit which is received firstly as a failure phase, and the other two phases are non-failure phases. The fault phase acquisition unit is used for calculating the time offset delta t between the time when the fault occurs and the synchronous time tick frame message sent by the collection unit1And the time difference Δ t between the time of receipt of the aggregate synchronization frame and the last sampling time2The non-fault phase acquisition unit acquires the time offset delta t1And after the initial time of the wave recording data is adjusted, the wave recording data is sent to the collecting unit, so that the rough synchronization among the three-phase acquisition units is realized. After the collecting unit receives the wave recording data of all the acquisition units, the collecting unit sends time difference delta t according to each phase of acquisition unit2And carrying out accurate synchronization through a Lagrange interpolation formula. The precision of the synchronous wave recording of the three-phase line is improved, the accuracy of the synthesized three-phase data is guaranteed, and the accuracy of the ground fault judgment is greatly improved.
EXAMPLE III
Fig. 3 is a flowchart of another synchronous recording method according to an embodiment of the present invention, and with reference to fig. 3, on the basis of the above embodiment, the method specifically includes the following steps:
step 310, before a line fails, the three-phase acquisition unit caches corresponding wave recording data of preset time respectively; and after the transmission of the wave recording data is finished, the wave recording data is cached again by each phase of acquisition unit, and the next fault wave recording is waited.
Specifically, according to the national standard, the sampling point of the transient recording type fault indicator is not less than 80 points per cycle. Therefore, the sampling period of the acquisition unit can be set to 250 microseconds, and 4000 data points are sampled per second according to the embodiment of the invention. Before a line fault occurs, the three-phase acquisition unit caches respective sampling value data all the time. In order to ensure that the acquisition unit can reliably receive the broadcast message sent by the collection unit, the preset time can be set to 5 seconds under the condition of considering the retransmission times of various interactive messages, and the size of the cache area is 20000 data points. When a line has a fault, each phase acquisition unit sends wave recording data containing at least 13 cycles to the collection unit based on the starting time of the respective wave recording data, and after the wave recording data are sent by each phase acquisition unit, the wave recording data are cached again to wait for the next fault wave recording. The time synchronization communication between the acquisition unit and the collection unit during normal operation can be avoided, the receiving and sending times of wireless messages between the acquisition unit and the collection unit are reduced, and the reduction of power consumption is facilitated.
And step 320, after determining the line fault phase according to the fault request message, the collecting unit sends a fault synchronous time setting message to the three-phase collecting unit in a broadcasting mode, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase collecting unit which is received firstly as the fault phase.
Acquisition unit calculation of faulted phasesThe time offset delta t between the current time and the fault occurrence time1The three-phase acquisition unit sends a signal containing a time offset delta t1The fault information message sent by the three-phase acquisition unit also comprises a time difference delta t between the time of receiving the collection synchronous frame and the last sampling time2。
Step 340, after receiving the synchronous time tick confirmation frame of the three-phase acquisition unit, the convergence unit sends a wave recording calling data message to the three-phase acquisition unit, wherein each frame of data message contains the time offset delta t of the wave recording starting point to be called by the three-phase acquisition unit1。
And step 350, each phase acquisition unit sends wave recording data containing at least 13 cycles to the collection unit based on the starting time of the respective wave recording data.
In the embodiment of the invention, when a line fails, the collecting unit takes the line corresponding to the failure request message sent by the collecting unit which is received firstly as a failure phase, and the other two phases are non-failure phases. The fault phase acquisition unit is used for calculating the time offset delta t between the time when the fault occurs and the synchronous time tick frame message sent by the collection unit1And the time difference delta t between the time when the three-phase acquisition unit receives the convergence synchronous frame and the last sampling time2The non-fault phase acquisition unit acquires the time offset delta t1And after the initial time of the wave recording data is adjusted, the wave recording data is sent to the collecting unit, so that the rough synchronization among the three-phase acquisition units is realized. After the collecting unit receives the wave recording data of all the acquisition units, the collecting unit sends time difference delta t according to each phase of acquisition unit2And synchronizing the three-phase wave recording data. The precision of the synchronous wave recording of the three-phase line is improved, the accuracy of the synthesized three-phase data is guaranteed, and the accuracy of the ground fault judgment is greatly improved. Before the line fails, the acquisition unit and the collection list can be ensured by setting the cache timeThe element normally operates without time synchronization communication, and only needs the acquisition unit to continuously buffer the sampling data for a certain time, so that the receiving and sending times of wireless messages can be reduced, the power consumption of the acquisition unit and the collecting unit is reduced, and the contradiction between the synchronous wave recording precision and the energy consumption of the device is solved.
Example four
Fig. 4 is a schematic structural diagram of a synchronous wave recording device according to an embodiment of the present invention, referring to fig. 4, a synchronous wave recording device 40 includes a three-phase acquisition unit 41 and a collection unit 42, the three-phase acquisition unit 41 corresponds to a three-phase line one by one, and the three-phase acquisition unit 41 is in wireless communication connection with the collection unit 42;
the collecting unit 42 is configured to, after determining a line fault phase according to the fault request message, send a fault synchronization time synchronization message to the three-phase collecting unit 41 in a broadcast manner, where the collecting unit 42 uses a line corresponding to the fault request message sent by the three-phase collecting unit 41 that is received first as the fault phase;
the three-phase acquisition unit 41 is configured to send a fault information packet to the collecting unit 42 according to the fault synchronization time synchronization packet, where the fault information packet includes a time offset Δ t between when the fault phase receives the fault synchronization time synchronization packet and a time when the fault occurs1And the time difference delta t between the time when the three-phase acquisition unit receives the collection synchronous frame and the last sampling time2；
The collecting unit 42 is configured to send a wave recording calling data message to the three-phase collecting unit 41 after receiving the synchronous time pairing confirmation frame of the three-phase collecting unit 41, where each frame of data message includes a time offset Δ t of a wave recording starting point to be called by the three-phase collecting unit 411；
Each phase acquisition unit is used for calling the recorded wave data message and based on the time offset delta t1Calculating the starting time of each wave recording data, and sending the wave recording data to the collecting unit 42;
the collecting unit 42 is used for collecting the time difference delta t sent by the units according to each phase2And synchronizing the three-phase wave recording data.
Optionally, each phase acquisition unit is configured to receive the fault-synchronized time tick messageThe respective current sampling times cnt2 and the time difference Δ t between the current time and the last sampling time are recorded2；
The acquisition unit of the fault phase is used for calculating the time offset delta t between the current moment and the fault occurrence moment1The three-phase acquisition unit 41 is used for transmitting a signal containing a time offset delta t1The fault information message sent by the three-phase acquisition unit 41 further includes a time difference Δ t between the time when the collected synchronous frame is received and the previous sampling time2。
Optionally, the integrating unit 42 is configured to calculate the time difference Δ t2And resampling the recording data of the three-phase acquisition unit 41 by a Lagrange interpolation method to complete synchronization of the three-phase synthesized waveform.
Fig. 5 is a schematic diagram of a synchronous recording according to an embodiment of the present invention, and fig. 6 is a schematic diagram of another synchronous recording according to an embodiment of the present invention, and based on the above embodiments, referring to fig. 5 and fig. 6, a line of phase a is taken as a fault phase, and a specific operating principle of the synchronous recording apparatus is as follows:
the sampling period of the acquisition unit is set to 250 microseconds, and 4000 data points are sampled every second. In order to ensure that the acquisition unit can reliably receive the broadcast message sent by the collection unit, the preset time can be set to 5 seconds under the condition of considering the retransmission times of various interactive messages, and the size of the cache area is 20000 data points. Before a line fault occurs, the three-phase acquisition unit caches respective sampling value data all the time. After the line fails, the collecting unit receives the failure request message sent by the a-phase collecting unit 410 first, and then the a-phase line is used as a failure phase, and the other two-phase lines are used as non-failure phases. The acquisition unit corresponding to the phase A line can judge the fault and record the current sampling times cnt1AAnd then sending a fault request message to a collecting unit, wherein the collecting unit responds to the received fault request message after determining a fault phase and sends fault synchronous time-setting messages to the three-phase acquisition units in a broadcasting mode. After the three-phase acquisition unit receives the fault synchronization time-setting message sent by the collection unit, the current sampling times cnt2 are recordedA、cnt2BAnd cnt2CAnd calculating the time difference delta t between the current time and the last time2A＝tA2-tA1、Δt2B＝tB2-tB1And Δ t2C＝tC2-tC1. The a-phase acquisition unit 410 calculates a time offset Δ t between the current time and the fault occurrence time according to the current sampling frequency and the sampling frequency of the fault occurrence time1A＝(cnt2A-cnt1A) Multiplied by 250 mus, the synchronization error is accurate to within 250 microseconds and sent to the collecting unit together.
After the three-phase acquisition units record the data of the corresponding lines, the three-phase acquisition units send synchronous time synchronization confirmation frames to the collecting unit, after the collecting unit receives the synchronous time synchronization confirmation frames sent by all the acquisition units, the collecting unit starts to send calling wave recording data messages to the three-phase acquisition units in a broadcasting mode, and each calling wave recording data message respectively contains the time offset delta t of the wave recording data to be called by the three-phase acquisition units at a wave recording point1. Each phase acquisition unit is based on time offset delta t1And calculating the starting time of the respective wave recording data to determine the starting point of starting wave recording. The phase a acquisition unit 410, the phase B acquisition unit 411 and the phase C acquisition unit 412 respectively calculate the start time of the recording data, and the start time of the recording data of the phase a line is t3A＝cnt2A-Δt1AThe starting time of the B-phase line wave recording data is t3B＝cnt2B-Δt1AThe starting time of the C-phase line wave recording data is t3C＝cnt2C-Δt1A. Then each phase of acquisition unit forms recording data containing complete cycle waves and sends the recording data to the collecting unit. After receiving the respective wave recording data sent by the three-phase acquisition unit, the collection unit collects the wave recording data according to the time difference delta t2A＝tA2-tA1、Δt2B＝tB2-tB1And Δ t2C＝tC2-tC1Three-phase data are synchronized through a Lagrange interpolation formula, so that the three-phase data of the three-phase line are synthesized into accurate synchronous wave recording data with zero-sequence transient current, and the wave recording data contain line faultsFault information, data waveforms of three-phase lines, etc.
In the embodiment of the invention, when a line fails, the collecting unit takes the line corresponding to the failure request message sent by the collecting unit which is received firstly as a failure phase, and the other two phases are non-failure phases. The fault phase acquisition unit is used for calculating the time offset delta t between the time when the fault occurs and the synchronous time tick frame message sent by the collection unit1And the time difference delta t between the time when the three-phase acquisition unit receives the convergence synchronous frame and the last sampling time2The non-fault phase acquisition unit acquires the time offset delta t1And after the initial time of the wave recording data is adjusted, the wave recording data is sent to the collecting unit, so that the rough synchronization among the three-phase acquisition units is realized. After the collecting unit receives the wave recording data of all the acquisition units, the collecting unit sends the time difference delta t according to the acquisition units of all the phases2And synchronizing the three-phase wave recording data. The precision of the synchronous wave recording of the three-phase line is improved, the accuracy of the synthesized three-phase data is guaranteed, and the accuracy of the ground fault judgment is greatly improved. Before a line breaks down, the cache time is set, so that the acquisition unit and the collection unit can be ensured to normally operate without time synchronization communication, and only the acquisition unit needs to continuously cache sampling data for a certain time, thereby reducing the receiving and sending times of wireless messages, reducing the power consumption of the acquisition unit and the collection unit, and solving the contradiction between the synchronous wave recording precision and the energy consumption of the device.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A synchronous wave recording method is characterized in that the synchronous wave recording method is executed by a synchronous wave recording device, the synchronous wave recording device comprises a three-phase acquisition unit and a collection unit, the three-phase acquisition unit corresponds to a three-phase circuit one by one, and the three-phase acquisition unit is in wireless communication connection with the collection unit;
the synchronous wave recording method comprises the following steps:
after determining a line fault phase according to a fault request message, the collecting unit sends a fault synchronous time setting message to the three-phase acquisition unit in a broadcast mode, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase acquisition unit which is received firstly as the fault phase;
the three-phase acquisition unit sends a fault information message to the collection unit according to the fault synchronous time synchronization message, wherein the fault information message comprises a time offset delta t between the time when the fault phase receives the fault synchronous time synchronization message and the time when the fault occurs1And the time difference delta t between the time when the three-phase acquisition unit receives the collection synchronous frame and the last sampling time2；
After receiving the synchronous time tick confirmation frame of the three-phase acquisition unit, the collecting unit sends a wave recording calling data message to the three-phase acquisition unit, wherein each frame of data message contains the time offset delta t of the wave recording starting point to be called by the three-phase acquisition unit1；
Each phase acquisition unit is based on the time offset delta t according to the calling recorded wave data message1Calculating the initial time of each wave recording data, and sending the wave recording data to the collecting unit;
the collecting unit is used for collecting the time difference delta t sent by each phase acquisition unit2And synchronizing the three phases of the wave recording data.
2. The synchronous recording method of claim 1, wherein the collecting unit uses a line corresponding to a fault request message sent by the first received three-phase collecting unit as a fault phase, and comprises:
and the three-phase acquisition units respectively send fault request messages to the collection unit, and record the current sampling times cnt1 of the acquisition units corresponding to the faults.
3. The synchronous recording method according to claim 2, wherein the three-phase acquisition unit sends a fault information message to the collection unit according to the fault synchronous time synchronization message, and the fault information message includes a time offset Δ t between the time when the fault phase receives the fault synchronous time synchronization message and the time when the fault occurs1And the time difference delta t between the time when the three-phase acquisition unit receives the collection synchronous frame and the last sampling time2The method comprises the following steps:
when each phase acquisition unit receives the fault synchronization time-setting message, the current sampling times cnt2 of each phase acquisition unit are recorded, and the time difference delta t between the time when each phase acquisition unit receives the collection synchronization frame and the previous sampling time2；
The acquisition unit of the fault phase calculates the time offset delta t between the current moment and the fault occurrence moment1The three-phase acquisition unit sends a signal containing the time offset delta t1The fault information message sent by the three-phase acquisition unit also comprises a time difference delta t between the time of receiving the collection synchronous frame and the last sampling time2。
4. The method of claim 3, wherein the time offset Δ t is a function of time1＝(cnt2-cnt1)*250μs。
5. The method according to claim 1, wherein said each phase acquisition unit is based on said time offset Δ t according to said summoning and recording data message1Calculating the starting time of each wave recording data, and sending the wave recording data to the collecting unit, wherein the method comprises the following steps:
and each phase acquisition unit sends recording data containing at least 13 cycles to the collection unit based on the starting time of the respective recording data.
6. The method according to claim 3, wherein said collecting unit collects said time differences Δ t transmitted from said phase acquisition units2And synchronizing the three phases of the recording data, comprising:
the collecting unit is used for collecting the time difference delta t sent by each phase acquisition unit2And resampling the recording data of the three-phase acquisition unit by a Lagrange interpolation method to complete synchronization of the three-phase synthesized waveform.
7. The synchronous recording method of claim 5, further comprising:
before a line fails, the three-phase acquisition unit caches corresponding wave recording data of preset time respectively;
and after the transmission of the wave recording data is finished, the wave recording data is cached again by each phase of acquisition unit, and the next fault wave recording is waited.
8. A synchronous wave recording device is characterized by comprising three-phase acquisition units and a collecting unit, wherein the three-phase acquisition units correspond to three-phase lines one to one, and the three-phase acquisition units are in wireless communication connection with the collecting unit;
the collecting unit is used for sending a fault synchronous time setting message to the three-phase acquisition unit in a broadcast mode after determining a line fault phase according to a fault request message, wherein the collecting unit takes the line corresponding to the fault request message sent by the three-phase acquisition unit which is received firstly as the fault phase;
the three-phase acquisition unit is used for sending a fault information message to the collection unit according to the fault synchronous time synchronization message, wherein the fault information message comprises a time offset delta t between the time when the fault phase receives the fault synchronous time synchronization message and the time when the fault occurs1And the time difference delta t between the time when the three-phase acquisition unit receives the collection synchronous frame and the last sampling time2；
The collecting unit is used for sending a calling wave recording data message to the three-phase acquisition unit after receiving a synchronous time setting confirmation frame of the three-phase acquisition unit, and each frame of data message respectively contains the time offset delta t of a wave recording starting point to be called by the three-phase acquisition unit1；
Each phase acquisition unit is used for calling the recorded wave data message according to the calling and based on the time offset delta t1Calculating the initial time of each wave recording data, and sending the wave recording data to the collecting unit;
the collecting unit is used for collecting the time difference delta t sent by each phase acquisition unit2And synchronizing the three phases of the wave recording data.
9. The apparatus according to claim 8, wherein each phase acquisition unit is configured to record a current sampling time cnt2 when receiving the fault-synchronized time-setting message, and a time difference Δ t between a time when the collected synchronization frame is received and a time when the collected synchronization frame is received2；
The acquisition unit of the fault phase is used for calculating the time offset delta t between the current moment and the fault occurrence moment1The three-phase acquisition unit is used for sending the time offset delta t1The fault information message sent by the three-phase acquisition unit also comprises a time difference delta t between the time of receiving the collection synchronous frame and the last sampling time2。
10. The apparatus according to claim 9, wherein the collecting unit is configured to collect the time difference Δ t from each phase collecting unit2And resampling the recording data of the three-phase acquisition unit by a Lagrange interpolation method to complete synchronization of the three-phase synthesized waveform.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0148674A1 (en) * | 1984-01-10 | 1985-07-17 | Balteau S.A. | Device and process for the localization of faults in cables |
| JP2002215163A (en) * | 2001-01-17 | 2002-07-31 | Yamaha Corp | Wave data analysis method, wave data analyzer, and recording medium |
| CN104467186A (en) * | 2014-12-15 | 2015-03-25 | 国网安徽省电力公司 | Full network fault recording data parameter-free accurate synchronizing method |
| CN107390090A (en) * | 2017-07-28 | 2017-11-24 | 思源电气股份有限公司 | A kind of circuitry fault detection method and system |
| CN108226836A (en) * | 2016-12-31 | 2018-06-29 | 科大智能电气技术有限公司 | A kind of calibration method of fault detector synchronous waveform |
| 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 |
| CN109462452A (en) * | 2018-10-26 | 2019-03-12 | 科大智能电气技术有限公司 | A method of improving transient state recording type fault detector sample-synchronous precision |
| CN109490714A (en) * | 2018-12-21 | 2019-03-19 | 长园深瑞继保自动化有限公司 | Wireless synchronization method for distribution fault recording system |
| CN109828183A (en) * | 2018-12-04 | 2019-05-31 | 国网江苏省电力有限公司电力科学研究院 | Synchronous waveform bearing calibration and its system suitable for transient state recording type fault detector |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013501450A (en) * | 2009-08-06 | 2013-01-10 | 韓国標準科学研究院 | Time broadcasting information transmitting / receiving device using power line and transmitting / receiving method thereof |
-
2019
- 2019-12-10 CN CN201911259993.3A patent/CN111220878B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0148674A1 (en) * | 1984-01-10 | 1985-07-17 | Balteau S.A. | Device and process for the localization of faults in cables |
| JP2002215163A (en) * | 2001-01-17 | 2002-07-31 | Yamaha Corp | Wave data analysis method, wave data analyzer, and recording medium |
| CN104467186A (en) * | 2014-12-15 | 2015-03-25 | 国网安徽省电力公司 | Full network fault recording data parameter-free accurate synchronizing method |
| CN108226836A (en) * | 2016-12-31 | 2018-06-29 | 科大智能电气技术有限公司 | A kind of calibration method of fault detector synchronous waveform |
| CN107390090A (en) * | 2017-07-28 | 2017-11-24 | 思源电气股份有限公司 | A kind of circuitry fault detection method and system |
| 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 |
| CN109462452A (en) * | 2018-10-26 | 2019-03-12 | 科大智能电气技术有限公司 | A method of improving transient state recording type fault detector sample-synchronous precision |
| CN109828183A (en) * | 2018-12-04 | 2019-05-31 | 国网江苏省电力有限公司电力科学研究院 | Synchronous waveform bearing calibration and its system suitable for transient state recording type fault detector |
| CN109490714A (en) * | 2018-12-21 | 2019-03-19 | 长园深瑞继保自动化有限公司 | Wireless synchronization method for distribution fault recording system |
Non-Patent Citations (2)
| Title |
|---|
| A Traveling Wave-Based Fault Location Method Using Unsynchronized Current Measurements;OD Naidu et.al;《IEEE TRANSACTIONS ON POWER DELIVERY》;20190430;第34卷(第2期);第505-513页 * |
| 基于拉格朗日一次插值的船舶故障录波时间同步;黄磊明 等;《计算机应用》;20170810;第37卷(第8期);第2427-2432页 * |
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