CN103941214B - A kind of electronic type transformer checking system and method based on TDC - Google Patents
A kind of electronic type transformer checking system and method based on TDC Download PDFInfo
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Abstract
The invention discloses a kind of electronic type transformer checking system and method based on TDC, described check system comprises standard electromagnetic transformer, standard signal interchanger, capture card, synchronised clock, TDC unit, computer. The present invention is built tradition checking system by asynchronous capture card and TDC unit combine, by increasing TDC unit, measurement triggering sampled signal is to the delay time that starts sampling, phase place to the standard signal of measuring is proofreaied and correct, thereby overcome the phase measurement error of standard channel, realize high-precision verification platform; The present invention both can be for checking electronic type transformers, also can be used for harmonic wave degree of accuracy test.
Description
Technical field
The present invention relates to a kind of electronic type transformer checking system and method based on TDC, belong to intelligent gridInstrument and equipment field tests.
Background technology
Along with social progress and scientific and technological development, the scale of power system constantly increases, transformer substation construction andTransformation speed is accelerated thereupon, and doing with modernization digital technology the digital transformer substation supporting becomes development trend.A large amount of electronic type measurement devices are used in digital transformer substation, typically for example electronic current mutual inductor (ECT)And electronic type voltage transformer (EVT) etc. These measurement devices, according to vertification regulation, need periodic verificationOr verification, with the accuracy of guaranteeing to measure. According to electronic mutual inductor field-checking specification, the electricity newly putting into operationThe minor transducer check cycle is 1 year, and actual capabilities are shorter, has every year a large amount of electronic type measurement devices to needExamine and determine or verification.
The research of checking electronic type transformers is done to a lot of work, the electronic type developing both at home and abroadTransducer check platform also has a lot. Electronic type transformer checking system is according to the difference of A/D converting unit,Be divided into Embedded A/D scheme and capture card scheme. Embedded A/D scheme is used A/D conversion chip to realizeAnalog-to-digital conversion, capture card scheme is used capture card (as the capture card of NI company) to realize analog-to-digital conversion.
Although the check system advantage of Embedded A/D scheme is very outstanding, for example its volume is little, cost is low,Its design complexities is high, and debugging difficulty is large, and stability is relatively poor. Current check system mostly on the market isEmbedded A/D scheme, the XL807 electronic transducer calibration instrument of for example certain scientific & technical corporation. By contrast,Although use capture card scheme cost relatively high, capture card has that integrated level is high, precision is high, performance is steadyDetermine the advantages such as reliable, in conjunction with current virtual instrument technique, can fast build the electricity of high accuracy, high stabilityMinor transducer check platform.
As everyone knows, based on the verification of comparison principle, one of its important content be exactly standard road signal with by schoolRoad signal synchronized sampling. Be illustrated in figure 1 analog electrical output minor current transformer verification schematic diagram, its markSignal He Beijiao road, accurate road signal just completes synchronized sampling by inter-sync module controls. But, current masterStream capture card all can not be accomplished strict synchronous triggering sampling, has the problem of sampling time delay. At paper " Anaccuratesystemforonsitecalibrationofelectronictransformerswithdigitaloutput》In, although a kind of novel synchronous mode of mentioning has overcome the shortcoming that capture card can not be strictly synchronous, drawThe another one problem rising is to send synchronizing signal to being undertaken synchronously by calibration equipment by check system. Based onThe check system of capture card, in the time receiving outer synchronous signal, can there is sampling time delay in sampling, and its phase place is surveyedAmount certainly exists error, thereby makes angular difference verification inaccurate. As shown in Figure 2, suppose the sampling of capture cardClock is 4kHz, and from receiving, to trigger sampled signal be when sampling to the maximum delay Δ t that starts sampling soThe one-period of clock is 250us. Taking 50Hz power frequency as example, the angular difference that 250us causes is about 270 points. ThereforeIf the verification platform that uses capture card to build is not proofreaied and correct the sampling delay time error of sampling card, can cause phasePosition measured deviation, concrete sampling time time delay 1us corresponding phase lags behind 1.08 points. Accurate for harmonic waveWhen degree test, this is more obvious with impact. For example, under 10 subharmonic conditions, 1us time difference correspondence 10.8Divide angular difference, overtone order is higher, and this impact is larger.
Be necessary that in sum it exists phase measurement for the check system that uses asynchronous capture card to buildThis problem of error, proposes a kind of high-precision electronic insertion transformer checking system based on TDC.
Summary of the invention
The invention provides a kind of electronic type transformer checking system and method based on TDC, solved useThere is the problem of phase measurement error in the check system that asynchronous capture card builds.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
Based on an electronic type transformer checking system of TDC, comprise standard electromagnetic transformer, standard letterNumber interchanger, capture card, synchronised clock, TDC unit, computer; Described standard signal interchanger receivesStandard analog voltage or the current signal of the output of standard electromagnetic transformer, and by standard analog voltage or electric currentSignal is converted to the standard analog voltage signal that the collected clamping of energy is received; Described synchronised clock is to capture card, TDCUnit and sent synchronized sampling triggering signal by school electronic mutual inductor; Described capture card receives standard analog electricityPress signal, receive the synchronized sampling triggering signal that synchronised clock sends, capture card is to standard analog voltage signalSample, be converted to digital voltage signal, and sampled result is sent to computer; Described TDC unitReceive the synchronized sampling triggering signal that synchronised clock sends, receive the sampling clock of capture card, during according to samplingClock and synchronized sampling triggering signal are measured capture card triggering and are sampled the delay time that starts sampling, and by time delayTime sends to computer; Described computer receives sampled data that capture card sends, by school electronic type mutual inductanceThe delay time that the sampled data that device sends and TDC unit send, according to the sampled data of capture card and quiltThe sampled data that school electronic mutual inductor sends calculates ratio and angular difference, according to the delay time diagonal angle of measuringPoor correction.
The method of angular difference being proofreaied and correct according to delay time is on original angular difference basis, to deduct by sampling time delayThe maximum angular difference Δ φ causing, concrete angular difference correcting value computational methods are
Δφ＝Δt/T×360×60
Wherein, T is the sampled signal cycle; Δ t is the delay time that TDC unit is measured.
Described TDC unit is to receive synchronized sampling triggering signal and followed by after synchronized sampling triggering signalFirst sampling clock as controlling the start-stop signal of timing.
Described capture card is 24 capture cards.
A method of calibration for electronic type transformer checking system based on TDC, comprises the following steps,
Step 1, initializes capture card and TDC unit;
Step 2, capture card, TDC unit and to be waited for that by school electronic mutual inductor synchronised clock sends synchronousSampling trigger signal;
Step 3, if receive synchronized sampling triggering signal, capture card carries out standard analog voltage signalSampling, is converted to digital voltage signal; TDC unit receives the sampling clock of capture card, according to sampling clockMeasure capture card triggering with synchronized sampling triggering signal and sample the delay time that starts sampling; By school electronic typeTransformer is sampled to the data signal of induction;
Step 4, computer receives sampled data, the adopting of being sent by school electronic mutual inductor that capture card sendsThe delay time that sample data and TDC unit send;
Step 5, the sampled data sending according to capture card and the sampled data being sent by school electronic mutual inductorCalculate ratio and angular difference;
Step 6, proofreaies and correct angular difference according to delay time;
Step 7, waits for next synchronized sampling triggering signal.
In step 6 according to delay time to angular difference proofread and correct method be, on original angular difference basis, deduct byThe angular difference Δ φ that sampling time delay causes, concrete angular difference correcting value computational methods are
Δφ＝Δt/T×360×60
Wherein, T is the sampled signal cycle; Δ t is the delay time that TDC unit is measured.
Described capture card is 24 capture cards.
The invention has the beneficial effects as follows: the present invention is built tradition checking system by asynchronous capture card andTDC unit combines, by increase TDC unit, measurement triggering sampled signal to start sample time delay timeBetween, the phase place of the standard signal to measurement is proofreaied and correct, thereby overcomes the phase measurement error of standard channel, realExisting high-precision verification platform; The present invention can, for checking electronic type transformers, also can be used for harmonic wave standardExactness test.
Brief description of the drawings
Fig. 1 is analog electrical output minor current transformer verification schematic diagram.
Fig. 2 is that capture card triggers sampling time delay schematic diagram.
Fig. 3 is a kind of structured flowchart of the electronic type transformer checking system based on TDC.
Fig. 4 is based on counting method TDC theory diagram.
Fig. 5 is TDC unit core circuit schematic diagram.
Fig. 6 is the checking process figure of check system.
Detailed description of the invention
Below in conjunction with Figure of description, the invention will be further described. Following examples are only for moreTechnical scheme of the present invention is clearly described, and can not limits the scope of the invention with this.
As shown in 3, a kind of electronic type transformer checking system based on TDC, is characterized in that: comprise markAccurate electromagnetic transformer, standard signal interchanger, capture card, synchronised clock, TDC unit and computer.
Described standard signal interchanger receives standard analog voltage or the electric current letter of standard electromagnetic transformer outputNumber, and standard analog voltage or current signal are converted to the standard analog voltage signal that the collected clamping of energy is received.In order to ensure the degree of accuracy, adopt 24 capture cards, be a kind of high-precision capture card, this capture card input letterNumber be generally ± 10V of scope, and the signal of pressure regulator or current lifting device output generally can not be directly inputted into collectionCard, need to pass through standard signal interchanger, and as 100V turns 4V, 5A turns 4V etc., its conversion precision is better than0.02％。
Described synchronised clock is to capture card, TDC unit and sent synchronized sampling by school electronic mutual inductor and triggerSignal. Synchronised clock, for receiving or sending synchronizing signal, can receive PPS or B code synchronizing signal,Send PPS and B code synchronizing signal, synchronised clock sends PPS or B code is synchronously adopted in the present invention simultaneouslySample triggering signal. Synchronised clock can use the XL8061 transformer station synchronous clock of Shenzhen Xing Long companyDevice.
Described capture card receives standard analog voltage signal, receives the synchronized sampling triggering letter that synchronised clock sendsNumber, standard analog voltage signal is converted to digital voltage signal to capture card and to its sampling, capture card will be adoptedSample result sends to computer, and capture card sends to computer by pci interface by sampled result, pci interfaceBus, can easily be inserted on industrial control computer mainboard PCI slot; The sampling clock of described capture card passes through RTSIBus is drawn, as the input of TDC unit. Capture card uses 24 high precision collecting cards, quantization errorBeing better than 0.01%, is existing product, its technology maturation, and reliability is high, uses simply, for example NI companyPCI-4474, has 24 precision.
Described TDC unit receives the synchronized sampling triggering signal that synchronised clock sends, and receives the sampling of capture cardClock, samples according to sampling clock and the triggering of synchronized sampling triggering signal measurement capture card prolonging of starting to sampleTime the time, and delay time is sent to computer. TDC unit uses FPGA as processing core, baseTo the time be converted to digital quantity in counting method, it is 50MHz that its plate carries crystal oscillator, and time resolution is without frequency multiplicationCan reach 0.02us, angular difference calibration accuracy is 0.02 point, for measuring capture card from receiving synchronized samplingTriggering signal triggers and samples the delay time starting between sampling, i.e. Δ t shown in Fig. 1. Measurement result warpSerial ports turns PCI and is sent to computer, in order to angular difference is proofreaied and correct.
Concrete, TDC unit adopts counting method, and its principle is taking tested time start-stop as " gate " signal,The step-by-step counting of control figure counter to given frequency, " opens the door " and start meter tested zero hour timeNumber, tested finish time time, shut the gate stopped counting. More specifically, taking PPS as example, work as identificationPPS rising edge starts counting, when identification stops meter followed by first sampling clock rising edge after PPSNumber, measuring principle block diagram as shown in Figure 4. Suppose that counting pulse frequency is Fclk, within the tested time period,The count value of counter is N, so tested time Δ T can calculate into
From above formula, when Fclk is larger, Δ T measures more accurate.
The FPGA that TDC unit uses selects hurricane 2 generation device EP2C5T144C8N, uses hardware descriptionLanguage development, the TDC unit core circuit schematic diagram of generation as shown in Figure 5.
Received by school electronic mutual inductor the synchronized sampling triggering signal that synchronised clock sends, to the numeral of inductionSignal is sampled, and sampled result is sent to computer by network interface.
Described computer receives the sampled data of capture card transmission, the hits being sent by school electronic mutual inductorAccording to this and the delay time that sends of TDC unit, the sampled data and mutual by school electronic type sending according to capture cardThe sampled data that sensor sends calculates ratio and angular difference, according to delay time, angular difference is proofreaied and correct, and obtainsBy the ratio of school electronic mutual inductor and angular difference.
The method that above-mentioned delay time is proofreaied and correct angular difference is on original angular difference basis, to deduct by sampling time delayThe maximum angular difference Δ φ causing, concrete angular difference correcting value computational methods are:
Δφ＝Δt/T×360×60
Wherein, T is the sampled signal cycle; Δ t is the delay time that TDC unit is measured, and its maximum is
Δ t=1/fs, fs is sample rate.
Above-mentioned a kind of electronic type transformer checking system based on TDC is built tradition by asynchronous capture cardChecking system and TDC unit combine, by increase TDC unit, measurement triggering sampled signal is to openingThe delay time of beginning sampling, proofreaies and correct the phase place of the standard signal of measuring, thereby overcomes the phase of standard channelPosition measure error, realizes high-precision verification platform; The present invention can be for checking electronic type transformers,Also can be used for harmonic wave degree of accuracy test.
The method of calibration of above-mentioned a kind of electronic type transformer checking system based on TDC as shown in Figure 6, is wrappedDraw together following steps:
Step 1, initializes capture card and TDC unit;
Step 2, capture card, TDC unit and to be waited for that by school electronic mutual inductor synchronised clock sends synchronousSampling trigger signal;
Step 3, if receive synchronized sampling triggering signal, capture card carries out standard analog voltage signalSampling, is converted to digital voltage signal; TDC unit receives the sampling clock of capture card, according to sampling clockMeasure capture card triggering with synchronized sampling triggering signal and sample the delay time that starts sampling; By school electronic typeTransformer is sampled to the data signal of induction;
Step 4, computer receives sampled data, the adopting of being sent by school electronic mutual inductor that capture card sendsThe delay time that sample data and TDC unit send;
Step 5, the sampled data sending according to capture card and the sampled data being sent by school electronic mutual inductorCalculate ratio and angular difference;
Step 6, proofreaies and correct angular difference according to delay time;
Step 7, waits for next synchronized sampling triggering signal.
More than show and described general principle of the present invention, principal character and advantage. The technology people of the industryMember should understand, and the present invention is not restricted to the described embodiments, in above-described embodiment and description, describe onlyBe explanation principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has respectivelyPlant changes and improvements, these changes and improvements all fall in the claimed scope of the invention. Requirement of the present inventionProtection domain is defined by appending claims and equivalent thereof.
Claims (7)
1. the electronic type transformer checking system based on TDC, is characterized in that: comprise standard electromagnetic transformer, standard signal interchanger, capture card, synchronised clock, TDC unit, computer;
Described standard signal interchanger receives standard analog voltage or the current signal of standard electromagnetic transformer output, and standard analog voltage or current signal are converted to the standard analog voltage signal that the collected clamping of energy is received; Described synchronised clock is to capture card, TDC unit and sent synchronized sampling triggering signal by school electronic mutual inductor; Described capture card receives standard analog voltage signal, receives the synchronized sampling triggering signal that synchronised clock sends, and capture card is sampled to standard analog voltage signal, is converted to digital voltage signal, and sampled result is sent to computer; Described TDC unit receives the synchronized sampling triggering signal that synchronised clock sends, receive the sampling clock of capture card, sample according to sampling clock and the triggering of synchronized sampling triggering signal measurement capture card the delay time that starts sampling, and delay time is sent to computer; Described computer receives the delay time that the sampled data of capture card transmission, the sampled data being sent by school electronic mutual inductor and TDC unit send, the sampled data sending according to capture card and the sampled data being sent by school electronic mutual inductor calculate ratio and angular difference, according to delay time, angular difference are proofreaied and correct.
2. a kind of electronic type transformer checking system based on TDC according to claim 1, it is characterized in that: the method for angular difference being proofreaied and correct according to delay time is, on original angular difference basis, deduct the angular difference Δ φ being caused by sampling time delay, concrete angular difference correcting value computational methods are
Δφ=Δt/T×360×60
Wherein, T is the sampled signal cycle; Δ t is the delay time that TDC unit is measured.
3. a kind of electronic type transformer checking system based on TDC according to claim 1, is characterized in that: described TDC unit is to receive synchronized sampling triggering signal and the start-stop signal as control timing followed by first sampling clock after synchronized sampling triggering signal.
4. a kind of electronic type transformer checking system based on TDC according to claim 1, is characterized in that: described capture card is 24 capture cards.
5. the method for calibration based on a kind of electronic type transformer checking system based on TDC claimed in claim 1, is characterized in that: comprises the following steps,
Step 1, initializes capture card and TDC unit;
Step 2, capture card, TDC unit and the synchronized sampling triggering signal of being sent by school electronic mutual inductor wait synchronised clock;
Step 3, if receive synchronized sampling triggering signal, capture card is sampled to standard analog voltage signal, is converted to digital voltage signal; TDC unit receives the sampling clock of capture card, samples according to sampling clock and the triggering of synchronized sampling triggering signal measurement capture card the delay time that starts sampling; By school electronic mutual inductor, the data signal of induction is sampled;
Step 4, computer receives the delay time that the sampled data of capture card transmission, the sampled data being sent by school electronic mutual inductor and TDC unit send;
Step 5, the sampled data sending according to capture card and the sampled data being sent by school electronic mutual inductor calculate ratio and angular difference;
Step 6, proofreaies and correct angular difference according to delay time;
Step 7, waits for next synchronized sampling triggering signal.
6. the method for calibration of a kind of electronic type transformer checking system based on TDC according to claim 4, it is characterized in that: the method for according to delay time, angular difference being proofreaied and correct in step 6 is, on original angular difference basis, deduct the angular difference Δ φ being caused by sampling time delay, concrete angular difference correcting value computational methods are
Δφ=Δt/T×360×60
Wherein, T is the sampled signal cycle; Δ t is the delay time that TDC unit is measured.
7. the method for calibration of a kind of electronic type transformer checking system based on TDC according to claim 4, is characterized in that: described capture card is 24 capture cards.
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| CN109061540A (en) * | 2018-10-18 | 2018-12-21 | 国网浙江省电力有限公司电力科学研究院 | Electronic transformer angular difference standard device |
| CN113834986A (en) * | 2021-09-02 | 2021-12-24 | 上汽通用五菱汽车股份有限公司 | Method for measuring electric signal error proofing, measuring equipment and readable storage medium |
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