CN104698421A - Electronic current transformer transient transformation delay time measuring device and method - Google Patents

Electronic current transformer transient transformation delay time measuring device and method Download PDF

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Publication number
CN104698421A
CN104698421A CN201410227561.5A CN201410227561A CN104698421A CN 104698421 A CN104698421 A CN 104698421A CN 201410227561 A CN201410227561 A CN 201410227561A CN 104698421 A CN104698421 A CN 104698421A
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China
Prior art keywords
signal
programmable gate
gate array
microprocessor
source signal
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CN201410227561.5A
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Chinese (zh)
Inventor
吴春红
刘磊
马伟东
李雷
罗海冰
马建胜
石光
赵勇
汤汉松
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JIANGSU LINGCHUANG ELECTRIC AUTOMATION CO Ltd
State Grid Corp of China SGCC
Henan Electric Power Research Institute
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JIANGSU LINGCHUANG ELECTRIC AUTOMATION CO Ltd
State Grid Corp of China SGCC
Henan Electric Power Research Institute
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Priority to CN201410227561.5A priority Critical patent/CN104698421A/en
Publication of CN104698421A publication Critical patent/CN104698421A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an electronic current transformer transient transformation delay time measuring device and method. The device comprises a signal conditioning module, an optical signal transceiver, an analog-to-digital conversion module, a high-precision constant-temperature crystal oscillator module, a field programmable gate array, a microprocessor and a display module, wherein the signal input end of the signal conditioning module is used for inputting a standard source signal, the signal output end of the signal conditioning module is connected with the first signal input end of the field programmable gate array through the analog-to-digital conversion module, the second signal input end of the field programmable gate array is connected with the transmitting end of the optical signal transceiver, the receiving end of the optical fiber transceiver is used for being connected with a to-be-measured source signal, the signal transmitting end of the field programmable gate array is connected with the microprocessor, the microprocessor is connected with the display module, and the high-precision constant-temperature crystal oscillator module is respectively connected with the analog-to-digital conversion module, the field programmable gate array and the microprocessor.

Description

Electronic current mutual inductor transient state progress of disease delay time measurement device and measuring method
Technical field
The present invention relates to the transient characterisitics field tests of the electronic mutual inductor applied in intelligent grid, particularly relate to a kind of electronic current mutual inductor transient state progress of disease delay time measurement device and measuring method.
Background technology
At present; electronic current mutual inductor is widespread use in intelligent grid; relay protection, metering, observing and controlling, failure wave-recording at equal intervals layer equipment all complete respective automation function based on the sampled value of electronic current mutual inductor, and the steady-state characteristic of electronic current mutual inductor and transient characterisitics directly have influence on the quality of rear end bay device performance.Relay protection device is the key equipment that power system safety and stability runs; accurately must judge with the fastest speed when fault occurs and determine whether action; now electronic current mutual inductor whether can fast and accurately by the transient current progress of disease of system primary side to relay protection device; just directly have influence on total short time consumption of failure removal; visible, in transient state process, the progress of disease delay time test of electronic current mutual inductor has very significance.
At present, do not have a set of perfect testing apparatus for electronic current mutual inductor transient state progress of disease time delay both at home and abroad, existing way one is: the absolute delay time index of electronic current mutual inductor under employing stable state as a reference; Way two: the actuation time of electronic current mutual inductor and protective relaying device being tested as a whole whole group.Way one has very large otherness due to the characteristic of electronic current mutual inductor in transient state and steady-state process; and; relay protection device is when transient state; different from during stable state to the application of current sampling data; the absolute delay time determined under stable state can not substitute the delay time under transient state, and reference role is very limited.The test of way two whole groups of delay times can not reflect the actuation time of each specific installation, does not have too large effect to the raising of qualitative analysis and each autonomous device performance.
When system transient modelling process occurs, the amplitude of electric current can significantly increase, and often contains attenuating dc component and harmonic component in fundametal compoment, and the electronic current mutual inductor Transfer characteristic under these conditions of different principle differs widely.The quick startup of relay protection device and action; all require to complete in 1 to 2 cycles after transient-wave sudden change; thus; electronic current mutual inductor transient state progress of disease delay test device, the T.T. that after accurately must reflecting transient state generation, the transient current of sudden change consumes from the primary side progress of disease to secondary side by electronic current mutual inductor.State Grid Corporation of China is in " Q-GDW441-2010 intelligent substation Protection Technology specification ", and the transmission delay time of specification electronic mutual inductor is all not more than 2ms under transient state and stable state.
Summary of the invention
The object of this invention is to provide a kind of electronic current mutual inductor transient state progress of disease delay time measurement device and measuring method; electronic current mutual inductor transient state progress of disease delay time can be tested; improve electronic current mutual inductor transient performance, further increase intelligent grid relay protection device responsiveness.
The technical solution used in the present invention is:
A kind of electronic current mutual inductor transient state progress of disease delay time measurement device, comprise Signal-regulated kinase, fiber-optic signal transceiver, analog-to-digital conversion module, High Accuracy Constant Temperature crystal oscillator module, field programmable gate array, microprocessor and display module, the signal input part of Signal-regulated kinase is for inputting standard source signal, the signal output part of Signal-regulated kinase connects the first signal input part of field programmable gate array by analog-to-digital conversion module, the transmitting terminal of the secondary signal input end connecting fiber signal transceiver of field programmable gate array, the receiving end of fiber-optic signal transceiver is for connecting measured source signal, the Signal transmissions end of field programmable gate array connects microprocessor, microprocessor connects display module, High Accuracy Constant Temperature crystal oscillator module connects analog-to-digital conversion module respectively, field programmable gate array and microprocessor.
A kind of electronic current mutual inductor transient state progress of disease delay time measuring method, comprises the following steps:
A: first, electronic current mutual inductor primary side system top transient current signal is gathered as standard source signal by Signal-regulated kinase, gather electronic current mutual inductor primary side system end transient current signal as measured source signal by fiber-optic signal transceiver, and standard source signal and measured source signal are sent to field programmable gate array;
B: the standard source signal that microprocessor transmits field programmable gate array and measured source signal carry out real-time Sudden Changing Rate and differentiate, differentiate that the computing formula of Sudden Changing Rate is: △ i=| [i (t)-i (t-T)] – [i (t-T)-i (t-2T)] | 1.
Wherein, tfor current time, tbe a power frequency cycle time, Sudden Changing Rate starts threshold iset20% of power taking type current transformer current rating, when △ i>= iset, and when continuing 2ms, be judged to be that Sudden Changing Rate occurs;
C: when electronic current mutual inductor primary side system is undergone mutation, the microprocessor records standard source sign mutation amount generation moment is t1, and from t1in the moment, extract the waveform of 2 cycle time windows, adopt fourier algorithm, extracting standard source signal fundamental phase is φ 1; The microprocessor records measured source sign mutation amount generation moment is t2, and from t2in the moment, extract the waveform of 2 cycle time windows, adopt fourier algorithm, extracting measured source signal fundamental phase is φ 2; Meanwhile, frequency measurement is carried out to standard source signal, obtain system ongoing frequency ?;
D: according to the compensation rate of formula 2. computing time Δ t,
Δt=(φ2-φ1)/2π?②;
E: the transient state progress of disease delay time 3. calculating electronic current mutual inductor according to formula td,
Td = t2 - t1 – Δt③。
The present invention is by nursing one's health electronic current mutual inductor primary side system power by Signal-regulated kinase, curb the unwanted signal components outside sampling bandwidth, signal after conditioning is sent to analog-to-digital conversion module conversion, and send to field programmable gate array as standard source signal, measured source signal is gathered again by fiber-optic signal transceivers, and send to field programmable gate array, through the transmission of field programmable gate array, microprocessor carries out analytical calculation, finally shows the transient state progress of disease time by display module; Meanwhile, utilize High Accuracy Constant Temperature crystal oscillator module to carry out precise time demarcation for links, ensure measurement accuracy, this apparatus structure is simple, small volume, to be easy to carry, improve transient state progress of disease time measurement accuracy.
Accompanying drawing explanation
Fig. 1 is system logic figure of the present invention;
Fig. 2 is process flow diagram of the present invention.
Embodiment
As Fig. 1, shown in 2, the present invention includes Signal-regulated kinase, fiber-optic signal transceiver, analog-to-digital conversion module, High Accuracy Constant Temperature crystal oscillator module, field programmable gate array, microprocessor and display module, the signal input part of Signal-regulated kinase is for inputting standard source signal, the signal output part of Signal-regulated kinase connects the first signal input part of field programmable gate array by analog-to-digital conversion module, the transmitting terminal of the secondary signal input end connecting fiber signal transceiver of field programmable gate array, the receiving end of fiber-optic signal transceiver is for connecting measured source signal, the Signal transmissions end of field programmable gate array connects microprocessor, microprocessor connects display module, High Accuracy Constant Temperature crystal oscillator module connects analog-to-digital conversion module respectively, field programmable gate array and microprocessor.
Electronic current mutual inductor transient state progress of disease delay time measuring method, comprises the following steps:
A: first, electronic current mutual inductor primary side system top transient current signal is gathered as standard source signal by Signal-regulated kinase, gather electronic current mutual inductor primary side system end transient current signal as measured source signal by fiber-optic signal transceiver, and standard source signal and measured source signal are sent to field programmable gate array;
B: the standard source signal that microprocessor transmits field programmable gate array and measured source signal carry out real-time Sudden Changing Rate and differentiate, differentiates that the computing formula of Sudden Changing Rate is:
△i=| [ i(t) - i(t-T) ] – [ i(t-T) - i(t-2T) ] |①,
Wherein, tfor current time, tbe a power frequency cycle time, Sudden Changing Rate starts threshold iset20% of power taking type current transformer current rating, when △ i>= iset, and when continuing 2ms, be judged to be that Sudden Changing Rate occurs;
C: when electronic current mutual inductor primary side system is undergone mutation, the microprocessor records standard source sign mutation amount generation moment is t1, and from t1in the moment, extract the waveform of 2 cycle time windows, adopt fourier algorithm, extracting standard source signal fundamental phase is φ 1; The microprocessor records measured source sign mutation amount generation moment is t2, and from t2in the moment, extract the waveform of 2 cycle time windows, adopt fourier algorithm, extracting measured source signal fundamental phase is φ 2; Meanwhile, frequency measurement is carried out to standard source signal, obtain system ongoing frequency ?;
D: according to the compensation rate of formula 2. computing time Δ t,
Δt=(φ2-φ1)/2π?②;
E: the transient state progress of disease delay time 3. calculating electronic current mutual inductor according to formula td,
Td = t2 - t1 – Δt③。
The present invention in use, the signal input part of Signal-regulated kinase is connected to the signal output part of the shunt of the primary side system top series connection of electronic current mutual inductor, and the signal input part of fiber-optic signal transceiver is connected to the signal output part of the merging unit of electronic transformer MU of the primary side system end series connection of electronic current mutual inductor.Shunt and merging unit of electronic transformer MU string are linked in the primary side current system of electronic mutual inductor, the primary side current transient value of electronic current mutual inductor is gathered.When electronic current mutual inductor is undergone mutation, be first undergo mutation in primary side system top, be secondly that primary side system end is undergone mutation, have certain sequencing in time, so there is the problem of transient state time delay.Primary side transient current is through the conversion of shunt, and exporting can for the low amplitude value analog voltage signal gathered, and this signal is as the standard source signal in this device.The transient current of electronic current mutual inductor primary side system end outputs to this device by FT3 or fiber optic Ethernet, as measured source signal by electronic current mutual inductor merge cells MU.Acting as of shunt: the electric current adopting shunt progress of disease primary side system, output voltage values, relative to the progress of disease of electromagnetic transformer, shunt has the better bandwidth sum linearity.Merge cells is used for carrying out mergings and synchronous process to the electric parameters that mutual inductor transmits, and the digital signal after process is transmitted to bay device use according to specific format.
Signal-regulated kinase, analog voltage signal is transformed to and calculates for data acquisition, control procedure, execution the digital signal showing reading or other objects, the standard signal that measured signal briefly becomes collecting device to identify by operation transformation such as amplification, filtering by signal condition exactly, refers to and utilizes inner circuit (as wave filter, converter, amplifier etc..) change the signal kind of input and export.Signal-regulated kinase of the present invention processes the standard source signal that shunt sends over, and curbs the unwanted signal components outside sampling bandwidth.
Field programmable gate array completes the reception of Ethernet sampled value and FT3 sampled value for realizing media access control sublayer, and Accurate Calibration sampled value markers, obtain measured source signal.MAC(Media Access Control, media interviews control) sublayer defines packet and how to transmit on medium.In the link sharing same bandwidth, be " prerequisite variable " to the access of connecting media.Relative to Ethernet fiber-optic signal transceiver, on-site programmable gate array FPGA can avoid the time jitter of data receiver link, and accurately can determine markers from Physical layer, fiber-optic signal transceiver is mainly as intermediate conveyor unit, receive fiber-optic signal, real-time transmission is carried out to measured source signal, but can not process accurately measured source signal.
High Accuracy Constant Temperature crystal oscillator module, all sequential control of system all based on high-precision constant-temperature crystal oscillator as timing foundation, the test error avoiding analog to digital conversion link and digital quantity to receive the error of link in time domain bringing.
Below, the embodiment of this device and principle of work are described in further detail:
The voltage signal of primary side system power within shunt converts peak value 10V to, for Signal-regulated kinase collection, after Signal-regulated kinase conditioning, can make the garbage signal of sampling outside frequency band range significantly decay.Consider the major harmonic scope of transient state current component, the sampling rate of analog-to-digital conversion module adopts 40KHz, selects 24 ∑-△ framework high-performance analog to digital converter ADS1271, to ensure that enough bandwidth sum precision obtain real primary side current waveform.The sampling time sequence of analog-to-digital conversion module controls based on the High Accuracy Constant Temperature crystal oscillator being not less than 5ppb, to reduce because the error of clock and instability cause sampling error, and then cause the error of test result, so, need the transmission each time to standard source signal, each sampled value carries out markers demarcation, ensure the accuracy of test.Fiber-optic signal transceiver adopts Agilent AFBR5803, on-site programmable gate array FPGA adopts the Spartan3 series of products XC3S1500 of Xilinx, the Ethernet sampled value and the FT3 sampled value that realize merge cells MU receive, on-site programmable gate array FPGA is equally based on the constant-temperature crystal oscillator of above-mentioned High Accuracy Constant Temperature crystal oscillator module, carry out precise time demarcation to each sampled value, the time jitter that each can be received link by the capability of sequential control that on-site programmable gate array FPGA is good controls in nanosecond rank.Embedded microprocessor adopts the MPC8247 of Freescale company, and this processor belongs to PowerQUICC II series, comprises a kernel based on PowerPC MPC603e, and a communication process kernel CPM.Microprocessor carries out Sudden Changing Rate differentiation to standard source signal and measured signal simultaneously, and the computing formula of Sudden Changing Rate is 1. as follows:
△i=| [ i(t) - i(t-T) ] – [ i(t-T) - i(t-2T) ] |①,
tfor current time, tbe power frequency cycle time, i.e. a 20ms.
Sudden Changing Rate starts threshold iset20% of power taking type current transformer ratings, when △ i>= iset, and when continuing 2ms, be judged to be that Sudden Changing Rate occurs.
For standard source signal, the record sudden change generation moment is t1, and from t1in the moment, extract the waveform of 2 cycle time windows, adopt the fourier algorithm of windowing, elimination decaying dc and harmonic component are on the impact of algorithm as much as possible, extract standard source signal fundamental phase φ 1.Meanwhile, frequency measurement is carried out to standard source signal, to obtain system ongoing frequency ?.For measured source signal, the record sudden change generation moment is t2, and from t2in the moment, extract the waveform of 2 cycle time windows, the same fourier algorithm adopting windowing, extract measured source signal fundamental phase φ 2.2. the compensation rate of time is calculated by formula: Δ t=(φ 2-φ 1)/2 π 2., 3. the transient state progress of disease delay time Td of final electronic current mutual inductor is calculated by formula and is: Td=t2-t1 – Δ t is 3..
This proving installation, to the standard source signal received and measured source signal, all carries out the real time discriminating of Sudden Changing Rate, arranges definite value and continues 2ms, namely think that Sudden Changing Rate occurs when discovery Sudden Changing Rate is greater than.The record standard source signal sudden change moment t1, and extract fundamental phase now φ 1, system frequency f; The sudden change moment of record measured source signal t2, and extract fundamental phase now φ 2.Because the collection of standard source signal and the collection of measured source signal control based on respective crystal oscillator, the time must be asynchronous, thus t1moment and t2moment must contain sampling asynchronous time; Meanwhile, due to the discretize of digital quantity, the instantaneous value in standard source sign mutation moment and the instantaneous value in measured source sign mutation moment must be discrepant, and the difference of this instantaneous value has also been reflected to simultaneously t1moment and t2on the mistiming in moment, particularly the instantaneous value error limit of electronic current mutual inductor requires it is 10%, and this species diversity be can not ignore especially.Because any difference in time domain must be reflected in phase place, this device adopts phase place to compensate and correct above-mentioned factor, standard source fundamental phase φ 1with measured source fundamental phase φ 2phase differential and coupling system frequency f, the compensation rate of time can be obtained: Δ t=(φ 2-φ 1)/2 π 2., the transient state transmission delay of final electronic current mutual inductor is: Td=t2-t1-Δ t is 3..

Claims (2)

1. an electronic current mutual inductor transient state progress of disease delay time measurement device, it is characterized in that: comprise Signal-regulated kinase, fiber-optic signal transceiver, analog-to-digital conversion module, High Accuracy Constant Temperature crystal oscillator module, field programmable gate array, microprocessor and display module, the signal input part of Signal-regulated kinase is for inputting standard source signal, the signal output part of Signal-regulated kinase connects the first signal input part of field programmable gate array by analog-to-digital conversion module, the transmitting terminal of the secondary signal input end connecting fiber signal transceiver of field programmable gate array, the receiving end of fiber-optic signal transceiver is for connecting measured source signal, the Signal transmissions end of field programmable gate array connects microprocessor, microprocessor connects display module, High Accuracy Constant Temperature crystal oscillator module connects analog-to-digital conversion module respectively, field programmable gate array and microprocessor.
2. an electronic current mutual inductor transient state progress of disease delay time measuring method, is characterized in that: comprise the following steps:
A: first, electronic current mutual inductor primary side system top transient current signal is gathered as standard source signal by Signal-regulated kinase, gather electronic current mutual inductor primary side system end transient current signal as measured source signal by fiber-optic signal transceiver, and standard source signal and measured source signal are sent to field programmable gate array;
B: the standard source signal that microprocessor transmits field programmable gate array and measured source signal carry out real-time Sudden Changing Rate and differentiate, differentiate that the computing formula of Sudden Changing Rate is: △ i=| [i (t)-i (t-T)] – [i (t-T)-i (t-2T)] | 1.
Wherein, tfor current time, tbe a power frequency cycle time, Sudden Changing Rate starts threshold iset20% of power taking type current transformer current rating, when △ i>= iset, and when continuing 2ms, be judged to be that Sudden Changing Rate occurs;
C: when electronic current mutual inductor primary side system is undergone mutation, the microprocessor records standard source sign mutation amount generation moment is t1, and from t1in the moment, extract the waveform of 2 cycle time windows, adopt fourier algorithm, extracting standard source signal fundamental phase is φ 1; The microprocessor records measured source sign mutation amount generation moment is t2, and from t2in the moment, extract the waveform of 2 cycle time windows, adopt fourier algorithm, extracting measured source signal fundamental phase is φ 2; Meanwhile, frequency measurement is carried out to standard source signal, obtain system ongoing frequency ?;
D: according to the compensation rate of formula 2. computing time Δ t,
Δt=(φ2-φ1)/2π?②;
E: the transient state progress of disease delay time 3. calculating electronic current mutual inductor according to formula td,
Td = t2 - t1 – Δt③。
CN201410227561.5A 2014-05-27 2014-05-27 Electronic current transformer transient transformation delay time measuring device and method Pending CN104698421A (en)

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CN105467351A (en) * 2016-01-18 2016-04-06 云南电网有限责任公司电力科学研究院 Electronic mutual inductor frequency response test method and system
CN105487034A (en) * 2016-01-25 2016-04-13 云南电网有限责任公司电力科学研究院 0.05-level electronic transformer verification method and system
CN105974351A (en) * 2016-06-14 2016-09-28 贵州电网有限责任公司电力科学研究院 Mutual inductor transient testing device with controllable amplifiable Rogowski coil differential signal and testing method thereof
CN106443551A (en) * 2016-10-12 2017-02-22 长飞光纤光缆股份有限公司 Full-optical fiber current transformer monitoring system
CN107797052A (en) * 2016-08-31 2018-03-13 南京南瑞继保电气有限公司 String supplementary set Chinese style acquisition system protection act delay measurement system and method
CN108196215A (en) * 2018-01-04 2018-06-22 广东电网有限责任公司电力科学研究院 A kind of DC electronic transformer delay time test method and device
CN109599836A (en) * 2018-12-05 2019-04-09 上海思源弘瑞自动化有限公司 Sudden Changing Rate determines method, apparatus, equipment and medium
CN109856583A (en) * 2017-11-30 2019-06-07 中国电力科学研究院有限公司 A kind of measuring device and method of electronic current mutual inductor progress of disease delay
CN109976298A (en) * 2017-12-27 2019-07-05 核动力运行研究所 A kind of fast response time tester and method based on error compensation
CN110045308A (en) * 2018-01-16 2019-07-23 中国电力科学研究院有限公司 All -fiber direct current measuring devices step response test macro and method

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CN105467351B (en) * 2016-01-18 2018-07-20 云南电网有限责任公司电力科学研究院 A kind of electronic mutual inductor frequency response test method and system
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CN105487034A (en) * 2016-01-25 2016-04-13 云南电网有限责任公司电力科学研究院 0.05-level electronic transformer verification method and system
CN105974351A (en) * 2016-06-14 2016-09-28 贵州电网有限责任公司电力科学研究院 Mutual inductor transient testing device with controllable amplifiable Rogowski coil differential signal and testing method thereof
CN105974351B (en) * 2016-06-14 2019-10-08 贵州电网有限责任公司电力科学研究院 The transformer transient test device and method that Rogowski coil differential signal controllably amplifies
CN107797052A (en) * 2016-08-31 2018-03-13 南京南瑞继保电气有限公司 String supplementary set Chinese style acquisition system protection act delay measurement system and method
CN106443551A (en) * 2016-10-12 2017-02-22 长飞光纤光缆股份有限公司 Full-optical fiber current transformer monitoring system
CN106443551B (en) * 2016-10-12 2019-09-10 长飞光纤光缆股份有限公司 A kind of all-fiber current transformator monitoring system
CN109856583B (en) * 2017-11-30 2020-10-27 中国电力科学研究院有限公司 Measuring device and method for transmission delay of electronic current transformer
CN109856583A (en) * 2017-11-30 2019-06-07 中国电力科学研究院有限公司 A kind of measuring device and method of electronic current mutual inductor progress of disease delay
CN109976298A (en) * 2017-12-27 2019-07-05 核动力运行研究所 A kind of fast response time tester and method based on error compensation
CN108196215A (en) * 2018-01-04 2018-06-22 广东电网有限责任公司电力科学研究院 A kind of DC electronic transformer delay time test method and device
CN110045308A (en) * 2018-01-16 2019-07-23 中国电力科学研究院有限公司 All -fiber direct current measuring devices step response test macro and method
CN109599836A (en) * 2018-12-05 2019-04-09 上海思源弘瑞自动化有限公司 Sudden Changing Rate determines method, apparatus, equipment and medium

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Application publication date: 20150610