CN103777104A - Time-delay characteristic testing device and method of digital substation secondary signal transmission system - Google Patents
Time-delay characteristic testing device and method of digital substation secondary signal transmission system Download PDFInfo
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- CN103777104A CN103777104A CN201410062577.5A CN201410062577A CN103777104A CN 103777104 A CN103777104 A CN 103777104A CN 201410062577 A CN201410062577 A CN 201410062577A CN 103777104 A CN103777104 A CN 103777104A
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Abstract
The invention provides a time-delay characteristic testing device and method of a digital substation secondary signal transmission system. The time-delay characteristic of the digital substation secondary signal transmission system, namely any node between output of a merging unit and an intelligent electric device, can be tested. According to the time-delay characteristic testing device and method, an Ethernet interface and an optical fiber interface are compatible, a time-delay test signal with periodically-changed amplitude and the stable frequency is generated through a three-phase controllable amplitude modulation power source, the cyclic wave position is calibrated through the amplitude, and interference of whole cyclic wave time delay in a time-delay test is eliminated; a self-generating synchronous clock signal is adopted, strict synchronization of inner sampling and signal circuit sampling is guaranteed, and the time-delay characteristic detecting accuracy is guaranteed; the corresponding relation between an inner sampling point and a signal circuit sampling point is determined through window comparison, the time difference of the corresponding sampling points is computed in a compared mode to obtain time-delay characteristic information, and transmission time difference shaking information of a system can be reflected.
Description
Technical field
The present invention relates to electric power detection technique field, specifically a kind of digitalized substation secondary signal transmission system time-delay characteristics proving installation and method.
Background technology
Digital transformer substation refers to the whole digitizings of information acquisition, transmission, processing, output procedure of transformer station, and essential characteristic is that device intelligence, communication network, model and communication protocol are unitized, computer-aided traffic control etc.By electronic mutual inductor, electrical network simulating signal is sampled as to digital signal; by merge cells, information is gathered; according to IEC61850-9-1/2 standard; the digital signal that comprises electric parameters is transmitted with ethernet frame format, by switch and Ethernet by communication to devices such as relay protection device and station level oscillographs.Digital transformer substation is inevitable requirement and the key character of intelligent grid development.
The signals transmission of digital transformer substation is as follows, realize the collection of electrical network electric parameters by electronic type transformer high voltage side sensing head, sample through A/D, export merge cells with digital signal according to specific format by optical fiber, merge cells collects the electric parameters information of multichannel electronic mutual inductor, according to IEC61850-9-1/2 standard, light signal is converted to digital signal, and synchronously export switch to ethernet frame format, switch passes to intelligent power equipment (IED) by fiber optic Ethernet by digital electric amount information, the equipment such as the failure wave-recording of digital relay protection equipment and station level, complete electric parameters signal whole digital transformer substation rapidly, transmission accurately.But electronic mutual inductor, merge cells and Ethernet transmission, need the regular hour, i.e. transmission delay in its data transmission and processing procedure.The size of output transmission delay; can directly have influence on the normal work of the devices such as electric system detection, metering, monitoring, relay protection; when serious, malfunction or the tripping of protective relaying device will be caused; cause generation and the expansion of power grid accident; therefore must detect the time-delay characteristics of digitalized substation secondary signal transmission system for intelligent substation, judge whether it meets the correlation technique code requirements such as metering and relay protection.
Digital transformer substation transmitting procedure is digital quantity, cannot test by the classic method such as oscillograph or power quality analyzer.But existing delay test is mainly towards mutual inductor and merge cells, be not applicable to the delay test apparatus and method of whole digitizing secondary singal transmission system, the digital transformer substation mutual inductor data acquisition system (DAS) method of calibration that traditional is testing source based on steady-state sine ripple, due to sinusoidal wave periodicity and symmetry, can not effectively differentiate the existence that is greater than power frequency period time delay (time delay complete cycle).And current immediate delay test method is to detect towards the absolute time delay of intelligent substation mutual inductor data acquisition system (DAS) now, method of testing is: utilize code power output encoder sinusoidal voltage, current signal, the primary side of access electronic mutual inductor, adopt and control workstation and standard mutual inductor output is beaten to markers realization with electronic mutual inductor output to be measured synchronize, after the sampling of standard potential transformer summation current transformer, then compare with tested merging unit of electronic transformer output signal the transmission delay amount that obtains system under test (SUT) of analyzing.Adopt the method only can detect mutual inductor and the absolute time delay of merge cells data acquisition system (DAS), be not suitable for digitalized substation secondary signal transmission system; In addition because digitalized substation secondary signal transmission system delay package is containing nondeterministic network time delay, therefore the method can not guarantee the synchronous of standard mutual inductor and to-be-tested transformer sampling; And the time delay of digitalized substation secondary signal transmission system changes and changes with network state, not determine constant value, only computing system entirety time delay of the method, therefore the method can not fully reflect the time-delay characteristics of the uncertain time delay that digitalized substation secondary signal transmission system brings due to network delay.
Summary of the invention
The object of patent of the present invention is for the deficiencies in the prior art, a kind of digitalized substation secondary signal transmission system time-delay characteristics proving installation and method based on controlled amplitude modulation power supply proposed, solve the limitation that prior art is not suitable for digitalized substation secondary signal transmission system, and definitely delay test result is accurate not, the deficiency that cannot detect transmission system jitter performance, and can accurately reflect time delay complete cycle of transmission system.
The technical solution used in the present invention is as follows:
A kind of digitalized substation secondary signal transmission system time-delay characteristics proving installation, comprise standard mutual inductor, electronic mutual inductor and by merge cells, the digitalized substation secondary signal transmission system of switch and Ethernet composition, it is characterized in that: also comprise three-phase programmable power supply, A/D sampling thief and control workstation, described three-phase programmable power supply is for receiving from the command pulse of controlling workstation, output amplitude changed by the cycle, the test signal of frequency stabilization, described test signal obtains analog output through standard mutual inductor, obtain digital output through electronic mutual inductor, controlling workstation produces synchronizing clock signals and exports to the synchronizing signal access point of digitalized substation secondary signal transmission system and the A/D sampling thief being connected with standard mutual inductor, the analog output of standard mutual inductor obtains sampled data after the sampling of A/D sampling thief, and send control workstation to, the digital output that electronic mutual inductor obtains inputs to digitalized substation secondary signal transmission system, the node of digitalized substation secondary signal transmission system transmits the digital signal of test place to controlling workstation, and parsing obtains resolution data, described control workstation carries out data point coupling to described sampled data and described resolution data, transmission delay calculates and demonstration record.
Time-delay characteristics proving installation as above, the signal output part of three-phase programmable power supply is connected with the signal input part of standard mutual inductor, electronic mutual inductor respectively, the signal output part of standard mutual inductor is connected with control workstation by A/D sampling thief, and the signal output part of electronic mutual inductor is connected with the signal input part of merge cells.
Time-delay characteristics proving installation as above, controls workstation and is made up of main control computer, host computer two parts, has worked in coordination with function.Instruction waveform generation module (11), setting module (12), data analysis module (16), display module (17) that described host computer machine comprises device one processed and is connected with controller one, complete setting, analysis and Presentation Function; Digital signal reception module to be measured (13), synchronizing clock signals generation module (14), A/D sampling thief receiver module (15) that described main control computer comprises controller two and is connected with controller two, complete synchronous clock generation, signal reception and analytical capabilities; Described controller one is connected with described controller two.
Time-delay characteristics proving installation as above, described instruction waveform generation module, makes the controlled amplitude modulation power supply of three-phase output amplitude by the test signal of cycle variation, frequency stabilization for sending instruction;
Described digital signal reception module to be measured, survey for receiving the digital signal to be measured that digitalized substation secondary signal transmission system node transmits, and obtain resolution data after described digital signal to be measured is resolved, be then sent to the data analysis module of host computer by main control computer;
Described synchronizing clock signals generation module, be used for exporting synchronizing clock signals, and described synchronizing clock signals is accessed simultaneously to synchronizing signal access point equipment such as () merge cellses at different levels and the A/D sampling thief being connected with standard mutual inductor of digitalized substation secondary signal transmission system, to guarantee that internal standard mutual inductor synchronizes with the strict of electronic mutual inductor sampling for the treatment of examining system through the sampling of A/D sampling thief;
Described A/D sampling thief receiver module, for receiving the sampled data from the output of A/D sampling thief, described sampled data is sent to the data analysis module of host computer by main control computer;
Described setting module, for realizing the setting of the coefficient parameter to whole detection system tester, described coefficient parameter comprises the coefficient parameters such as time delay ξ t, cycle, amplitude;
Described data analysis module, for receiving from the resolution data of digital signal reception module to be measured with from the sampled data of A/D sampling thief receiver module, above-mentioned two kinds of signals are carried out to data value comparison, mate at respective counts strong point, delayed data counting statistics, draws maximum transmitting time delay △ t
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information;
Described display module, for show transmission delay tables of data and and draw standard mutual inductor sample waveform figure and number of test points according to sample graph by trace-point method, and by above-mentioned maximum transmitting time delay △ t
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information shows.
A kind of digitalized substation secondary signal transmission system time-delay characteristics method of testing, is characterized in that comprising the steps:
A. the controlled amplitude modulation power supply of three-phase generates amplitude by cycle variation, the controlled delay test signal of frequency plot according to the requirement of controlling workstation steering order, and described delay test signal is inputed to the input end of standard mutual inductor and electronic mutual inductor;
B. measure described test signal by standard mutual inductor, electronic mutual inductor, using the simulating signal of standard mutual inductor output as standard signal; Using electronic mutual inductor and be that the digital signal of arbitrary node output in digitalized substation secondary signal transmission system process is as digital signal to be measured through merge cells, switch, Ethernet;
C. electronic mutual inductor is input as analog quantity, is output as digital signal, and through optical fiber, digital signal is delivered to merge cells; Merge cells receives the digital signal from electronic mutual inductor output, and above-mentioned digital signal is delivered to intelligent power equipment I ED by electric parameters digital signal through switch and fiber optic Ethernet according to the frame format of IEC61850-9-2 regulation;
D. certain node of choosing in digitalized substation secondary signal transmission system is test point, the digital signal that test point is received is sent to control workstation, thereby control its sampling by the synchronizing signal access point of controlling workstation output synchronizing clock signals access digitalized substation secondary signal transmission system with the A/D sampling thief pulse signal being connected with standard mutual inductor, the standard signal of standard mutual inductor output obtains sampled data after the sampling of A/D sampling thief, and inputs to control workstation;
E. after synchronizing clock signals control synchronized sampling, control workstation by first passing through IEC61850-9-2 data frame analyzing from the data that transmit to be measured, obtain resolution data;
F. described control workstation carries out data point coupling, transmission delay calculating and shows record described sampled data and described resolution data.
Time-delay characteristics method of testing as above, described step f is specially: the sampled data of resolution data and standard mutual inductor is stored in respectively in two internal storage locations, and according to sequential, data value, the workstation clock information of the time of reception of the clock log data of control workstation;
In control workstation, described sampled data and described resolution data are handled as follows:
According to time sequence information, stored sampled data and resolution data are sorted according to sampling instant, guarantee to arrange according to sampling instant;
Comparison amplitude window is set, the data value amplitude of resolution data and sampled data is compared, determine the matching relationship of resolution data and sampled data data value, window size is greater than one-period;
The workstation clock time that calculates respectively identical sampling time sequence data point is poor, draws the mistiming at series of identical sampled data value moment strong point, and draws maximum time difference t
max, the poor t of minimum time
min, averaging time poor t
aver, mistiming shake;
By the above-mentioned maximum time difference t calculating
max, the poor t of minimum time
min, averaging time poor t
averdeduct the maximum transmitting time delay △ t that tester time delay ξ t obtains transmission system to be measured
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver:
△t
max=t
max-ζt
△t
min=t
min-ζt
△t
aver=t
aver-ζt
ξ t is tester time delay, comprises the time delay of device inner high speed A/D sampling, and the reaction time of synchronizing clock signals generation module and tested point data frame analyzing are processed time delay, for fixing can measured value;
According to controlling workstation clock signal, at same time domain coordinate, resolution data and sampled data are carried out to described point drawing, and by the display module of controlling workstation, the waveform of the waveform at test point place and test source output is shown simultaneously, meanwhile, gained maximum transmitting time delay △ t will be calculated in step e
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information shows.
Be than its advantage of conventional check system:
1. press by the controlled amplitude modulation power generation of three-phase amplitude the test signal that the cycle changes, frequency is constant, by the position of amplitude size mark cycle, thereby can accurately judge the corresponding relation of digital signal to be measured and standardized digital signal, accurately distinguish time delay complete cycle of digitalized substation secondary signal transmission system, thereby obtain accurate transmission delay.
Control in workstation data acquisition module is independent, by data acquisition with process respectively at main control computer and host computer is asynchronous carries out, weaken the requirement to device hardware; The data analysis module of setting up and display module, can measure read latch easily; Simultaneously, control the inner output of workstation synchronous clock, access and the A/D sampling thief for the treatment of examining system transmission loop equipment (comprising the equipment such as merge cells) and standard mutual inductor end, thereby control its sampling with an identical times frequency sampling start pulse signal, can synchronize with the strict of electronic mutual inductor sampling for the treatment of examining system through the sampling of A/D sampling thief by assurance device internal standard mutual inductor.
3. the present invention is by the clock information of contrast respective inner standard mutual inductor A/D sampled point and transmission system signal circuit sampled point, determine the sequential corresponding relation of inner A/D sampled data and the sampling of transmission system electronic mutual inductor, delayed data that can the each sampled point of accurate measure according to workstation clock, and add up maximum transmitting time delay △ t
max, minimum transfer time delay △ t
min, average transmission time delay △ t
aver, the time-delay characteristics such as transmission time shake, can react simply accurately the time-delay characteristics of transmission system to be measured.
4. input interface of the present invention-digital signal reception module to be measured, compatible Ethernet interface and optical fiber interface, can directly access merge cells to the optical fiber output of inter-exchange and the Ethernet output of switch, without other conversion.Can test the time-delay characteristics of digitalized substation secondary signal transmission system (merge cells exports between intelligent power equipment) arbitrary node, simple, easy to operate, test result is accurate.
Accompanying drawing explanation
Fig. 1 is the structural representation of digitalized substation secondary signal transmission system time-delay characteristics proving installation of the present invention;
Fig. 2 is the electrical block diagram of controlling workstation in Fig. 1;
Fig. 3 is the electrical block diagram of the controlled amplitude modulation power supply of three-phase in Fig. 1;
Fig. 4 is the storage schematic diagram that the present invention exports amplitude-modulation coding wave datum;
Fig. 5 is that schematic diagram is calculated in window data point coupling of the present invention and time delay;
Fig. 6 is the schematic flow sheet of digitalized substation secondary signal transmission system time-delay characteristics method of testing of the present invention;
Fig. 7 is amplitude-modulation coding ripple schematic diagram of the present invention.
In figure: the controlled amplitude modulation power supply of 1-three-phase, 2-standard mutual inductor, 3-electronic mutual inductor, 4-control workstation, 5-A/D sampling thief, 6-merge cells, 7-synchronizing clock signals, 8-switch, 9-Ethernet, 10-digitalized substation secondary signal transmission system, 11-instruction waveform generation module, 12-setting module, 13-digital signal reception module to be measured, 14-synchronizing clock signals generation module, 15-A/D sampling thief receiver module, 16-data analysis module, 17-display module, 18-three-phase isolation transformer, 19-not control rectifying circuit, 20-filtering circuit, 21-Three-phase SPWM inverter circuit.
Embodiment
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is clearly and completely described.
Referring to Fig. 1, digitalized substation secondary signal transmission system time-delay characteristics proving installation of the present invention comprises three-phase programmable power supply 1, standard mutual inductor 2, electronic mutual inductor 3, controls workstation 4, A/D sampling thief 5 and form digitalized substation secondary signal transmission system 10 by merge cells 6, switch 8 and Ethernet 9.Wherein the arbitrary node of digitalized substation secondary signal transmission system 10 can be used as the output terminal of digital signal to be measured.The signal output part of three-phase programmable power supply 1 is connected with the signal input part of standard mutual inductor 2, electronic mutual inductor 3 respectively, the signal output part of standard mutual inductor 2 is connected with control workstation 4 by A/D sampling thief 5, the signal output part of electronic mutual inductor 3 is connected with merge cells 6 signal input parts, and the output terminal that the arbitrary node of digitalized substation secondary signal transmission system 10 can be used as digital signal to be measured is connected with control workstation 4.
The controlled amplitude modulation power supply 1 of three-phase obtains energy from electrical network, receives from the instruction of controlling workstation 4, and output amplitude is by the test signal (as shown in Figure 7) of cycle variation, frequency stabilization.
Refer to Fig. 3, A, B, C three-phase voltage, through a three-phase isolation transformer 18, power to the controlled amplitude modulation power supply 1 of described three-phase.The controlled amplitude modulation power supply 1 of described three-phase mainly comprises four parts, not control rectifying circuit 19, filtering circuit 20, Three-phase SPWM inverter circuit part 21.The main body of circuit is ac-dc-ac inverter circuit, and civil power has been realized the conversion of AC-to DC through control rectifying circuit 20 not, and filtering circuit 20 plays stable DC voltage.Described controlled amplitude modulation power supply 1 output amplitude changed with the cycle, frequency stabilization is test voltage, the current waveform of power frequency, referring to Fig. 7, amplitude-modulated sinusoid production process is as follows: first, control workstation 4 and send coded order to the controlled amplitude modulation power supply 1 of three-phase according to the sinusoidal wave form of required generation, coded order essence is a series of coded pulses.Diagram produces sinusoidal wave for frequency is 50Hz, the sine wave that initial amplitude is 50V, and according to wave amplitude increase 25V weekly, period 1 amplitude is 50V, and be 75V second round, the period 3 is 100V ... the mode gained of encoding.
The test signal that the controlled amplitude modulation power supply 1 of described three-phase is exported obtains analog output through standard mutual inductor 2, obtains digital output through electronic mutual inductor 3.The conduct after 5 samplings of A/D sampling thief of the analog output of standard mutual inductor 2 detects the standard signal of time delay, and input control workstation 4; The voltage and current digital signal that electronic mutual inductor 3 gathers after treatment; deliver to merge cells 6 by optical fiber transmission; merge cells 6 is directly passed to digital relay protection device by point-to-point transmission or process is passed to Ethernet 9 by switch 8, for intelligent power equipment such as digital transformer substation wave recording devices.Control workstation 4 and export synchronizing clock signals 7 needs synchronous clock device (being synchronizing signal access point) to the merge cells 6 in A/D sampling thief 5 and the transmission system signal circuit to be measured of standard mutual inductor 2 ends etc., thereby control it with an identical times frequency sampling start pulse signal and sample to respectively electronic mutual inductor 3, the A/D sampling thief 5 that connects with standard mutual inductor 2 simultaneously, thereby guarantee that the A/D digital sampled signal of standard mutual inductor strictly synchronizes with the digital sampled signal of system electronic formula mutual inductor to be measured.
Refer to Fig. 2, described control workstation 4 is made up of main control computer, host computer two parts, has worked in coordination with function.Instruction waveform generation module (11), setting module (12), data analysis module (16), display module (17) that host computer machine comprises controller one and is connected with controller one, complete setting, analysis and Presentation Function; Digital signal reception module to be measured (13), synchronizing clock signals generation module (14), A/D sampling thief receiver module (15) that described main control computer comprises controller two and is connected with controller two, complete synchronous clock generation, signal reception and analytical capabilities.
Described instruction waveform generation module 11, makes controlled amplitude modulation power supply 1 output amplitude of three-phase by the test signal of cycle variation, frequency stabilization for sending instruction;
Described digital signal reception module 13 to be measured surveys for receiving the digital signal to be measured that digitalized substation secondary signal transmission system node transmits, and obtain resolution data after described digital signal to be measured is resolved, be then sent to the data analysis module 16 of host computer by main control computer;
Described synchronizing clock signals generation module 14, be used for exporting synchronizing clock signals, and described synchronizing clock signals is accessed simultaneously to the synchronizing signal access point (comprising the equipment such as merge cells) and the A/D sampling thief 5 being connected with standard mutual inductor 2 of digitalized substation secondary signal transmission system 10, strict the synchronizeing of can 2 samplings through A/D sampling thief 5 of assurance device internal standard mutual inductor sampling with the electronic mutual inductor 3 for the treatment of examining system;
A/D sampling thief receiver module 15, for receiving the sampled data of exporting from A/D sampling thief 5, described sampled data is sent to the data analysis module 16 of host computer by main control computer;
Described setting module 12 is for realizing the setting to coefficient parameters such as whole detection system tester time delay ξ t, cycle, amplitudes;
Described data analysis module 16, for receiving from the resolution data of digital signal reception module 13 to be measured with from the sampled data of A/D sampling thief receiver module 15, above-mentioned two kinds of signals are carried out to data value comparison, respective counts strong point coupling, the processes such as delayed data counting statistics, draw maximum transmitting time delay △ t
max, minimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information;
Described display module 16, for show transmission delay tables of data and and draw standard mutual inductor sample waveform figure and number of test points according to sample graph by trace-point method, and by above-mentioned maximum transmitting time delay △ t
max, minimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information shows.
Control the digital signal that the main control computer of workstation 4 receives test place that the digital signal (being sampled data) after 5 samplings of A/D sampling thief and digitalized substation secondary signal transmission system node to be measured send from standard mutual inductor 2 simultaneously, and will first pass through IEC61850-9-2 data frame analyzing from the data that transmit to be measured, obtain resolution data, the sampled data of resolution data and standard mutual inductor 2 is stored into respectively to two internal storage locations, and the sequential of record data, data value, the information such as the workstation clock of the time of reception, send the host computer of controlling workstation 4 to, gained standard mutual inductor 2 being processed through digital signal (being sampled data) and the signal data at above-mentioned place to be tested after A/D sampling in host computer:
According to time sequence information, stored sampled data and resolution data are sorted according to sampling instant.There is not uncertain network time delay in the digital signal after standard mutual inductor A/D sampling wherein, its time sequence information is the sequential of the time of reception, the signal data at place to be tested is owing to there being uncertain network time delay, may cause reception sequential not identical with sampling time sequence, arrange storage therefore need carry out sequential according to sequential numbering in its Frame, its form is as Fig. 4, " sequential " represents the sequential of data point sampling instant, " data value " is voltage, the current value of data sampling, workstation clock when " moment " expression control workstation 4 receives these data.
Comparison amplitude window is set, data value to sampled data and resolution data is compared, the matching relationship of determining resolution data and sampled data data value, window size should be greater than one-period, guarantees that the sampling number certificate that comparison is enough obtains matching relationship accurately;
The workstation clock time that calculates respectively identical sampling time sequence data point is poor, as shown in Figure 5, in whole comparison window, standard mutual inductor A/D sampled data is mated with the data value of place to be measured resolution data, show that both match at data point, be that standard mutual inductor A/D sampled data sequential 1 matches with the data after the resolution data sequential n of place to be measured, draw the mistiming △ t of series of identical sampling instant data point, i.e. △ t=T
n-t
n￠ T
nfor the markers of place to be measured resolution data, t
nfor standard mutual inductor A/D sampled data markers.
The mistiming at statistical number strong point, can draw maximum time difference t
max, the poor t of minimum time
min, averaging time poor t
aver, mistiming shake (the neighbouring sample point time interval time of reception is departed from the size of sampling period value);
By the above-mentioned maximum time difference t calculating
max, the poor t of minimum time
min, averaging time poor t
averdeduct the maximum transmitting time delay △ t that tester time delay ξ t obtains transmission system to be measured
max, minimum transfer time delay △ t
min, average transmission time delay △ t
aver:
△t
max=t
max-ζt
△t
min=t
min-ζt
△t
aver=t
aver-ζt
Wherein ξ t is tester time delay, comprises the time delay of device inner high speed A/D sampling, and the reaction time of synchronizing clock signals generation module 14 and tested point data frame analyzing are processed time delay, can measured value for fixing.
According to controlling workstation clock signal, at same time domain coordinate, resolution data and sampled data are carried out to described point drawing, and by the display module of controlling workstation, the waveform of the waveform at test point place and test source output is shown simultaneously, meanwhile, gained maximum transmitting time delay △ t will be calculated in step e
max, minimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information shows.
Referring to Fig. 6, workflow comprises: configuration testing loop, system go out initialization, Site Detection, generation monitoring result etc.First, Access Control workstation 4, connect circuit, after power turn-on, system is debugged, debug complete, digital signal reception module 13 to be measured, A/D sampling thief receiver module 15, data analysis module 16, the display module 17 of controlling workstation 4 are carried out to initialization, carry out the isoparametric setting of instruction waveform by setting module 12 simultaneously.After initialization and setting complete, power turn-on, system completes the comparative analysis of the generation of controlled pulsewidth waveform, signal synchronous collection and waveform automatically, determine both corresponding relations according to the size of amplitude, the A/D sampled data of mutual inductor that settles the standard and the corresponding relation of place to be measured resolution data, then control the data analysis module 16 of workstation 4 according to corresponding relation, calculating maximum transmitting time delay △ t
max, minimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information, draw the transmission delay characteristic at place to be measured, show output by display module.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any belong to those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (6)
1. a digitalized substation secondary signal transmission system time-delay characteristics proving installation, comprise standard mutual inductor (2), electronic mutual inductor (3) and by merge cells (6), the digitalized substation secondary signal transmission system (10) of switch (8) and Ethernet (9) composition, it is characterized in that: also comprise three-phase programmable power supply (1), A/D sampling thief (5) and control workstation (4), described three-phase programmable power supply (1) is for receiving from the command pulse of controlling workstation (4), output amplitude changed by the cycle, the delay test signal of frequency stabilization, described delay test signal obtains analog output through standard mutual inductor (2), obtain digital output through electronic mutual inductor (3), controlling workstation (4) produces synchronizing clock signals (7) and exports to the synchronizing signal access point of digitalized substation secondary signal transmission system (10) and the A/D sampling thief (5) being connected with standard mutual inductor (2), the analog output of standard mutual inductor (2) obtains sampled data after A/D sampling thief (5) sampling, and sampled data is exported to and controls workstation (4), the digital output that electronic mutual inductor (3) obtains inputs to digitalized substation secondary signal transmission system (10), through digitalized substation secondary signal transmission system (10) transmission, export to and control workstation (4) in Node extraction to be measured digital signal to be measured, resolve and obtain resolution data at control workstation (4), described control workstation (4) carries out data point coupling to described sampled data and described resolution data, transmission delay calculates and demonstration record.
2. time-delay characteristics proving installation according to claim 1, it is characterized in that: the signal output part of three-phase programmable power supply (1) is connected with the signal input part of standard mutual inductor (2), electronic mutual inductor (3) respectively, the signal output part of standard mutual inductor (2) is connected with control workstation (4) by A/D sampling thief (5), the signal output part of electronic mutual inductor (3) is connected with the signal input part of merge cells (6), and digitalized substation secondary signal transmission system (10) node signal output terminal to be tested is connected with control workstation (4).
3. time-delay characteristics proving installation according to claim 1, it is characterized in that: control workstation (4) and formed by main control computer, host computer two parts, work in coordination with function, instruction waveform generation module (11), setting module (12), data analysis module (16), display module (17) that described host computer machine comprises controller one and is connected with controller one, complete setting, analysis and Presentation Function; Digital signal reception module to be measured (13), synchronizing clock signals generation module (14), A/D sampling thief receiver module (15) that described main control computer comprises controller two and is connected with controller two, complete synchronous clock generation, signal reception and analytical capabilities; Described controller one is connected with described controller two.
4. time-delay characteristics proving installation according to claim 3, is characterized in that:
Described instruction waveform generation module (11), makes the controlled amplitude modulation power supply of three-phase (1) output amplitude by the test signal of cycle variation, frequency stabilization for sending instruction;
Described digital signal reception module to be measured (13), survey for receiving the digital signal to be measured that digitalized substation secondary signal transmission system node transmits, and obtain resolution data after described digital signal to be measured is resolved, be then sent to the data analysis module (16) of host computer by main control computer;
Described synchronizing clock signals generation module (14), be used for exporting synchronizing clock signals, and described synchronizing clock signals is accessed to the synchronizing signal access point of digitalized substation secondary signal transmission system (10) and the A/D sampling thief (5) being connected with standard mutual inductor (2) simultaneously, to guarantee the sampling and synchronizeing that the electronic mutual inductor (3) for the treatment of examining system sample of internal standard mutual inductor (2) through A/D sampling thief (5);
Described A/D sampling thief receiver module (15), for receiving the sampled data from A/D sampling thief (5) output, described sampled data is sent to the data analysis module (16) of host computer by main control computer;
Described setting module (12), for realizing the setting of the coefficient parameter to whole detection system tester, described coefficient parameter comprises time delay ξ t, cycle, amplitude;
Described data analysis module (16), for receiving from the resolution data of digital signal reception module to be measured (13) with from the sampled data of A/D sampling thief receiver module (15), above-mentioned two kinds of signals are carried out to data value comparison, respective counts strong point coupling, delayed data counting statistics, draws maximum transmitting time delay △ t
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information;
Described display module (17), for showing the tables of data of transmission delay, draws standard mutual inductor sample waveform figure and number of test points according to sample graph by trace-point method, and by above-mentioned maximum transmitting time delay △ t
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information shows.
5. a digitalized substation secondary signal transmission system time-delay characteristics method of testing, is characterized in that comprising the steps:
A. the controlled amplitude modulation power supply of three-phase (1) generates amplitude by cycle variation, the controlled delay test signal of frequency plot according to the requirement of controlling workstation (4) steering order, and described delay test signal is inputed to the input end of standard mutual inductor (2) and electronic mutual inductor (3);
B. measure described delay test signal by standard mutual inductor (2), electronic mutual inductor (3), using the simulating signal of standard mutual inductor (2) output as standard signal; Using the digital signal of electronic mutual inductor (3) and arbitrary node output in merge cells (6), switch (8), Ethernet (9) process as digital signal to be measured;
C. electronic mutual inductor (3) is input as analog quantity, is output as digital signal, and through optical fiber, digital signal is delivered to merge cells (6); Merge cells (6) receives the digital signal from electronic mutual inductor (3) output, and above-mentioned digital signal is delivered to intelligent power equipment I ED by electric parameters digital signal through switch (8) and fiber optic Ethernet (9) according to the frame format of IEC61850-9-2 regulation;
D. certain node of choosing in digitalized substation secondary signal transmission system (10) is test point, the digital signal that test point is received is sent to controls workstation (4), by control workstation (4) output synchronizing clock signals (7) access digitalized substation secondary signal transmission system (10) synchronizing signal access point with the A/D sampling thief (1) being connected with standard mutual inductor (2) thus pulse signal is controlled its sampling, the standard signal of standard mutual inductor (2) output obtains sampled data after A/D sampling thief (5) sampling, and input to control workstation (4),
E. after synchronizing clock signals (7) is controlled synchronized sampling, control workstation (4) by first passing through IEC61850-9-2 data frame analyzing from the data that transmit to be measured, obtain resolution data;
F. described control workstation (4) carries out data point coupling, transmission delay calculating and shows record described sampled data and described resolution data.
6. time-delay characteristics method of testing as claimed in claim 5, it is characterized in that: described step f is specially: the sampled data of resolution data and standard mutual inductor (2) is stored in respectively in two internal storage locations, and according to sequential, data value, the workstation clock information of the time of reception of the clock log data of control workstation (4);
In control workstation (4), described sampled data and described resolution data are handled as follows:
According to time sequence information, stored sampled data and resolution data are sorted according to sampling instant, guarantee to arrange according to sampling instant;
Comparison amplitude window is set, the data value amplitude of resolution data and sampled data is compared, determine the matching relationship of resolution data and sampled data data value, window size is greater than one-period;
The workstation clock time that calculates respectively identical sampling time sequence data point is poor, draws the mistiming at series of identical sampled data value moment strong point, and draws maximum time difference t
max, the poor t of minimum time
min, averaging time poor t
aver, mistiming shake;
By the above-mentioned maximum time difference t calculating
max, the poor t of minimum time
min, averaging time poor t
averdeduct the maximum transmitting time delay △ t that tester time delay ξ t obtains transmission system to be measured
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver:
△t
max=t
max-ζt
△t
min=t
min-ζt
△t
aver=t
aver-ζt
ξ t is tester time delay, comprises the time delay of device inner high speed A/D sampling, and the reaction time of synchronizing clock signals generation module and tested point data frame analyzing are processed time delay, for fixing can measured value;
According to controlling workstation (4) clock signal, at same time domain coordinate, resolution data and sampled data are carried out to described point drawing, and by the display module (16) of controlling workstation (4), the waveform of the waveform at test point place and test source output is shown simultaneously, meanwhile, gained maximum transmitting time delay △ t will be calculated in step e
maxminimum transfer time delay △ t
min, average transmission time delay △ t
aver, and system transmission time difference wobble information shows.
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