CN109387697A - Wireless phase measurement device, method for synchronizing time and wireless Method for Phase Difference Measurement - Google Patents
Wireless phase measurement device, method for synchronizing time and wireless Method for Phase Difference Measurement Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- H—ELECTRICITY
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Abstract
The present disclosure discloses a kind of wireless phase measurement device, method for synchronizing time and wireless Method for Phase Difference Measurement; mainly solve the problems, such as that active load measures combining unit phase phase sequence in intelligent substation relay protection or differential protection; wireless phase measurement device phase measurement error using the method for synchronizing time of the disclosure is small; it is not limited by a space within the scope of wireless data communication; time synchronization speed is fast, greatly improves measurement accuracy, measurement efficiency and measurement safety.
Description
Technical field
This disclosure relates to intelligent power transformation distribution correlative technology field, in particular to wireless phase measurement device, when
Between synchronous method and wireless Method for Phase Difference Measurement.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, it is not necessary to so constitute first skill
Art.
As intelligent digital substation widely applies, huge change is had occurred in the infield of secondary device and running environment
Change, the bus of different voltages grade, the mutual inductor secondary singal of switch are converted into digital signal at combining unit, pass through
Fiber optic network is transmitted to central control room.Combining unit abbreviation MU refers to and carries out to the electrical quantity that a mutual inductor transmits
Merge and synchronization process, and treated digital signal is transmitted to the device that bay device uses according to specific format.?
In the protective relaying device active load verification of new clothes, including in the test of three-phase through-flow simulation active load, due to combining unit
Be distributed in different location, cause phase test between the voltage of secondary singal, electric current extremely inconvenient, in order to between test point mutually
Voltage (or electric current) signal of sensor carries out phase shift inspection, is measured using phase meter, it is necessary to be measured by the way of dragging line.
For large-scale substation dragging line distance up to several hundred rice, and multiple barrier may be bypassed from a test point to another test point
Hinder, complicated test environment causes cabling intricate, and measurement efficiency is low, and long range dragging line is easy to produce security risk.
For wireless phase measurement device, Yao Shixian phase is accurately measured, it is necessary to time synchronization problem is solved, when existing
Between the method for synchronization can be divided into two kinds, one kind is select a side as time reference, and another party is according to benchmark check and correction, such as RTC
Clock check and correction；Another kind is selects third party as benchmark, and all measuring devices are according to the reference synchronization, such as GPS second arteries and veins
Punching synchronizes.
RTC clock proofreads low precision, is difficult the deviation (millionth deviation within the scope of total temperature) of breakthrough ± 1ppm,
Up to will cause 3600 × 10 in measurement in 1 hour-3×1/106=3.6ms error, being converted into operating frequency phase deviation is 64.8 °.
GPS time precision is high, no cumulative errors, but GPS equally exists various problems in use at the scene, comprising: 1 is only capable of making in outdoor
With or indoor connection it is then several meters short, long then tens meters of Antenna extender line to outdoor；2GPS is received in signal and wireless measurement
Wireless data transmission signal there may be radio frequency interferences；Although 3 GPS can generate pulse per second (PPS) in 30s, because leap second receives
Orthochronous may reach 12.5min even it is longer.
Summary of the invention
The disclosure to solve the above-mentioned problems, proposes a kind of wireless phase measurement device, method for synchronizing time and wireless
Method for Phase Difference Measurement mainly solves active load in intelligent substation relay protection or differential protection and measures combining unit phase phase
The problem of sequence, the wireless phase measurement device phase measurement error using the method for synchronizing time of the disclosure is small, and wireless data is logical
It is not limited by a space in news range, time synchronization speed is fast, greatly improves measurement accuracy, measurement efficiency and measurement safety.
To achieve the goals above, the disclosure adopts the following technical scheme that
A kind of or multiple embodiments provide a kind of wireless phase measurement device, including by being wirelessly connected without phase of line
Measure host and wireless phase measurement extension set；
Wireless phase measurement device host includes host-processor, the first signal acquisition process module, the first wireless communication
Module, the first clock signal source module and time pulse generation module；The host-processor is respectively and at the first signal acquisition
Reason module, the first wireless communication module, the first clock signal source module are connected with time pulse generation module；
Wireless phase measurement extension set include extension set processor, second signal acquisition processing module, the second wireless communication module,
Second clock signal source module and time pulse trapping module；The extension set processor respectively with second signal acquisition process mould
Block, the second wireless communication module, second clock signal source module are connected with time pulse trapping module.
Further, wireless phase measurement extension set further includes extension set display screen and key, the extension set display screen and key
It is connect respectively with extension set processor.
Further, the first signal acquisition process module includes sequentially connected first secondary singal acquisition module, first
Signal amplification module and the first analog-to-digital conversion module；Second signal acquisition processing module includes sequentially connected second secondary signal
Acquisition module, second signal amplification module and the second analog-to-digital conversion module.
A kind of method for synchronizing time, for realizing the time synchronization of host and extension set, the host and extension set are respectively phase
Level measuring arrangement, the extension set are at least one, include the following steps:
The crystal oscillator frequency of host is carried out process of frequency multiplication as the clock signal of host according to the multiple of setting by step 1；
Step 2 generates time pulse signal by the timing of host timer according to the clock signal of host；
Step 3, extension set obtain the time pulse signal that host generates by time pulse acquisition mode；
Step 4, calculate the received time pulse signal of extension set two pulses between time interval value average value, institute
Average value is stated as extension set pulse interval timer overflow value；
Step 5, extension set obtain impulsive synchronization verification by time pulse acquisition mode, when extension set captures the pulse of host
When, it resets extension set synchro timer count value and starts new extension set synchro timer and overflow interruption, when extension set synchro timer
Overflow the pulse that extension set is exported when interrupting.
Further, the time pulse acquisition mode specifically: by host time pulse generation module and extension set when
Between pulse capture module connect, when extension set obtain host time pulse signal pulse rising edge when, extension set is recorded as connecing
The input of a pulse is received.
Further, the average value of the time interval value between two pulses of the received time pulse signal of extension set is calculated
Method specifically:
Acquire the time value of at least two pulses of the time pulse signal of host；
The difference for calculating the time value of two pulses obtains time interval value between adjacent pulse two-by-two；
The time interval value of calculating is filtered, the average value of time interval value is calculated.
One kind in wireless Method for Phase Difference Measurement includes the following steps: that wireless phase measurement dress is arranged at each combining unit
It sets, wireless phase measurement host is set at one of combining unit, nothing is set at other combining units in addition to host is set
Phase of line measures extension set；
(1) using the clock of host as benchmark, extension set is synchronized according to the time of host, so that extension set and host
Time and sampling time interval are consistent；
(2) host and extension set acquire the secondary singal of substation secondary device simultaneously at same time point respectively；
(3) host and extension set are filtered the phase and width for obtaining acquisition signal to the signal respectively acquired respectively
Value；
(4) extension set will treated phase and amplitude information by being wirelessly transmitted to host；
(5) host is by the phase and amplitude information for the acquisition signal that extension set is sent and host in adopting of acquiring of same time point
The phase and amplitude for collecting signal carries out the phase difference that vector calculus obtains extension set signal lag host sampled signal；
(6) phase result of vector calculus is transmitted to extension set, compares vector phase operation result and notional phase value is
It is no consistent, if unanimously, export result 1: the phase for acquiring signal is correct, and executes step (7)；Otherwise, it exports result 2: adopting
Collect the phase error of signal；
(7) (2)-(6) are repeated with the number of setting, if step (6) output every time is all result 1, phase is just
Really；If each step (6) output is all result 2, phase error；
Further, using the clock of host as benchmark, extension set is used according to the method that the time of host synchronizes
Such as a kind of described in any item method for synchronizing time of claim 2-4.
Further, the filtering processing is specially to sampled signal fast Fourier transform.
Further, the vector calculus specifically: the phase value of host subtracts the phase value of extension set, and difference is extension set letter
The angle of number lag host sampled signal.
Compared with prior art, the disclosure has the beneficial effect that
(1) the wireless phase measurement device of the disclosure realizes substation relay protection by the way that wireless transport module is arranged
The measurement of middle secondary singal phase and amplitude avoids security risk caused by long range dragging line, avoids because indoor limitation is led
Draw operation outside the GPS antenna of cause, improves testing efficiency and improve measuring accuracy.
(2) the wireless phase measurement device of the disclosure uses high stability temperature compensating crystal oscillator, and stability is high, the small work of temperature drift
For time reference, the time clock provided is accurate.
(3) a kind of high-precision time synchronization method and wireless phase measurement device of the disclosure mainly solves intelligent power transformation
The problem of active load measurement combining unit phase phase sequence in relay protection or differential protection of standing, usefulness is booting 30s
Deadline is synchronous, 1 hour accumulated phase error is no more than 1 °, and 1000m exempts from dragging line wireless data transceiving, in communication context not by
Space limitation greatly improves measurement accuracy, measurement efficiency and measurement safety.
(4) the wireless Method for Phase Difference Measurement of the disclosure can be used for secondary singal phase and amplitude in substation relay protection
Measurement, intuitively shows the degree of unbalancedness of phase relation and every voltage or electric current, while avoiding peace caused by long range dragging line
Full hidden danger draws operation outside GPS antenna caused by avoiding because of indoor limitation, improves testing efficiency and improves measuring accuracy.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation do not constitute the restriction to the application for explaining the application.
Fig. 1 is the structure chart according to the wireless phase measurement device of one or more embodiments；
Fig. 2 is a kind of method for synchronizing time flow chart of the disclosure；
Fig. 3 is a kind of wireless Method for Phase Difference Measurement process of the disclosure.
Specific embodiment:
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.It should be noted that not conflicting
In the case where, the features in the embodiments and the embodiments of the present application can be combined with each other.Below in conjunction with attached drawing to embodiment
It is described in detail.
In the technical solution disclosed in one or more embodiments, as shown, a kind of wireless phase measurement device,
Including the wireless phase measurement host and wireless phase measurement extension set by being wirelessly connected；
Wireless phase measurement device host includes host-processor, the first signal acquisition process module, the first wireless communication
Module, the first clock signal source module and time pulse generation module；The host-processor is respectively and at the first signal acquisition
Reason module, the first wireless communication module, the first clock signal source module are connected with time pulse generation module.First signal acquisition
Processing module includes sequentially connected first secondary singal acquisition module, the first signal amplification module and the first analog-to-digital conversion mould
Block；
Wireless phase measurement extension set include extension set processor, second signal acquisition processing module, the second wireless communication module,
Second clock signal source module and time pulse trapping module；The extension set processor respectively with second signal acquisition process mould
Block, the second wireless communication module, second clock signal source module are connected with time pulse trapping module.Wireless phase measurement extension set
It further include extension set display screen and key, the extension set display screen and key are connect with extension set processor respectively.Second signal acquisition
Processing module includes sequentially connected second secondary signal acquisition module, second signal amplification module and the second analog-to-digital conversion mould
Block.
The host display can use colored touch screen, and the model of colored touch screen can be FD96, interface display is clear,
Content is comprehensive；The extension set display screen can be shown and be operated using lattice lcd screen and keypad, and equipment is light and handy, carries
It is convenient.
The extension set and host-processor are provided simultaneously with high-speed data processing capacity, are responsible for carrying out the digital signal of sampling
High speed FFT operation obtains the phase and amplitude information of specific signal frequency.The model of host-processor can for DSP and
Cortex-M4 the or Cortex-M7 series processors of FPU instruction, and to guarantee sufficient data buffer storage space, processor ram
High-performance processor or STM32F7 series processors not less than 128KB, such as in STM32F4 series, extension set processor
Model can be consistent with host-processor model, takes into account processor performance and economy, host can be adopted with extension set in the present invention
With STM32F407VET6 processor.
The first secondary singal acquisition module and second secondary signal acquisition module can be identical, and secondary singal acquires mould
Block includes voltage signal acquisition circuit and current signal Acquisition Circuit, for acquiring the secondary singal of substation secondary device；Electricity
Pressure signal acquisition circuit is that the high stability divider resistance not less than 2M is connected with voltage transformer primary side, in mutual induction of voltage
Device secondary side increases sampling resistor, and the voltage signal being applied on sample circuit is exactly the secondary voltage signal that we need；Electricity
Signal acquisition circuit is flowed for open-close type current pincers, and the sampling precision of current clamp is not less than 5 ‰, and range is not less than 10A, and current clamp is defeated
The sampled circuit of the current signal of outlet, which is changed into voltage signal and send to signal amplification module, to be further processed.
The signal amplification module is for being further amplified processing to sampled signal, to realize that D/A converter module is converted
The efficient raising using with measurement accuracy of digit；Signal amplification module can select difference amplifier chip INA128 and low-voltage
Lack of proper care chip OP07, can realize low pass active power filtering by 100p capacitor in parallel in signal amplification circuit.
The analog-to-digital conversion module uses 16 high-precision AD converters, the sampling time point of voltage signal and current signal
It can be controlled separately, to realize the fine tuning of phase deviation caused by hardware circuit；Meanwhile using FSMC interface communication, sampling is realized
The quick transmission of data and processor；The present embodiment analog-to-digital conversion module can use AD7606 chip.
First and second wireless communication module can be using Lora wireless communication module, it can be achieved that remote under low-power consumption
Distance Transmission, and communication module use networking mode, it can be achieved that a host, the wireless data of more extension sets and wireless instructions biography
It is defeated.When multiple extension sets are arranged, the second wireless communication module of each extension set is established with the first wireless communication module of host respectively
It is wirelessly connected, carries out the transmission of data.Network layer protocol based on Lora technology is mainly LoRaWAN, defines network communication
Agreement and system architecture, the communication system network of LoRaWAN are starlike planar network architectures.It is broadly divided into following three kinds, first, point pair
Point communication is exactly that A point is initiated, and B point receives.Second, radial network poll, the mode of point to multi--point, a central point and N number of
Node, by node, central point receives then confirmation and finishes receiving, and next node continues to upload, until N number of node is complete
At this calculates a cycle period.Third, radial network is concurrent and the communication of point to multi--point, unlike multiple nodes can
To be communicated simultaneously with central point, this saves the power consumption of node, avoids the failure of respective nodes and cause the paralysis of network
The stability of paralysis, network is improved.The concurrent communication modes of radial network are used in present embodiment.Lora wireless communication module
Including LoRa chip and chip periphery circuit, the SX1278 chip of SEMTCH company can be selected.Chip periphery circuit includes crystalline substance
Shake three clock circuit, radio frequency input/output match circuit and interface microcontroller circuit parts.
Time pulse generation module generates the time pulse signal of acquisition signal for host, and time pulse trapping module is caught
Obtain the rising edge of the time pulse signal of host sending；The host further includes time pulse output port, and the extension set also wraps
Time pulse capture-port is included, the time pulse output port and time pulse capture-port can be earphone hole.
The port TIM5_CH1 of STM32F407VET6 processor has both 32 bit timing devices and low and high level output function, and time pulse is raw
Structure at module is that the port TIM5_CH1 of processor is connected to wireless phase measurement device host by anti-interference resistance
Time pulse output port the port TIM5_CH1 is being connected to earpiece holes just by anti-interference resistance if it is earpiece holes
Pole connects the ground wire of the ground wire of earpiece holes and processor；The port TIM2_CH1 of STM32F407VET6 processor has both 32
Timer and input capture interrupt function, time pulse trapping module structure are by the extension set port processor TIM2_CH1 through anti-dry
The time pulse capture-port that resistance is connected to wireless phase measurement device extension set is disturbed, if it is earpiece holes, by the end TIM2_CH1
Mouth is connected to the anode of earpiece holes by anti-interference resistance, and the ground wire of the ground wire of earpiece holes and processor is connected；It is being led
Machine is connected with when the synchronization of extension set by double male connector earphone cables, realizes the transmission of main extension pulse signal.
The the first clock signal source module and second clock signal source module of the disclosure can use identical crystal oscillator, clock
Signal source module can select high stability temperature compensating crystal oscillator or be constant-temperature crystal oscillator, the high stability temperature compensating crystal oscillator, phase mistake
Difference depends on the stability (i.e. temperature drift) of crystal oscillator.The high stability temperature compensating crystal oscillator temperature drift can easily meet 0.05ppm or less.Institute
Stating high stability temperature compensating crystal oscillator temperature drift suitable environment is -20 DEG C~80 DEG C, the temperature change one under conventional in-site measurement environment
As do not exceed 20 DEG C, and close to room temperature, temperature drift can be controlled in 0.01ppm under this environment.
The pulse signal calibration for adding ARM timer interruption to generate using high-precision temperature compensating crystal oscillator, calibration flexibility is high, booting
Time calibration can be realized in 30s.Existing high-precision temperature compensating crystal oscillator precision ± 5ppm, the reachable ± 0.05ppm of stability.
Existing 20MHz or less crystal oscillator is multiplied to the rear measurement frequency stability of 100MHz or more by the frequency multiplication measurement of crystal oscillator, will
Measurement accuracy improves an order of magnitude.So that final time deviation is controlled in ± 0.01ppm.
By a kind of above-mentioned each merging of secondary singal that wireless phase measurement device is separately positioned on substation secondary device
The voltage or current of unit enters at line, one of those wireless phase measurement device is set as host, remaining is wireless
Phase measurement device is set as extension set, and the transmission of extension set and host acquisition signal is just able to carry out by being wirelessly transferred, is being believed first
Host with extension set carries out the temporal synchronous of wireless phase measurement device by wired connection before number acquiring, predominantly with host
Crystal oscillator precision as reference precision, will be consistent after extension set crystal oscillator accuracy correction with host.It can be adopted using above-mentioned apparatus
The measurement that phase is carried out with the method measured in the prior art using phase meter, can by the wireless measurement device of the present apparatus
Dragging line communication is changed to wireless communication, the safety and efficiency of systematic survey are enhanced.
The disclosure also discloses following method for synchronizing time and Method for Phase Difference Measurement, passes through the improvement and phase of synchronous method
The measurement accuracy of the further height-adjusting system of improvement of position measurement method.
A kind of method for synchronizing time, as shown in Fig. 2, it is used for the time synchronization of host and extension set, the host and extension set point
Not Wei wireless phase measurement device, the extension set can be set it is multiple, using following steps realize host it is synchronous with extension set:
Step 1, crystal oscillator frequency multiplication: using the crystal oscillator frequency of host according to setting multiple carry out process of frequency multiplication as host when
Clock signal；
It is that existing more than ten000000, tens temperature compensation is brilliant that the crystal oscillator frequency of host, which carries out process of frequency multiplication according to the multiple of setting,
Vibration is multiplied to 200,000,000 or more by the processor inside host, to guarantee that 32 bit timing device resolution ratio of follow-up system reaches 1/
100M, so as to measure the crystal oscillator deviation of 0.01ppm.The multiple of frequency multiplication can according to need the resolution requirement reached and carry out
Setting.
Step 2 generates time pulse: generating time pulse letter by the timing of host timer according to the clock signal of host
Number；
Time pulse, which is generated, exports low and high level simulated time pulse signal, time pulse by time pulse output port
Signal low and high level, which is overflowed to interrupt by wireless phase measurement device timer, to be determined, thus the time arteries and veins that generation time interval is equal
Signal is rushed, the time pulse signal only needs host to generate and as reference signal source, the rising edge of the time pulse signal
The point of interruption is overflowed for host timer.
Step 3, time pulse capture: extension set obtains the time pulse letter that host generates by time pulse acquisition mode
Number；
Specially altogether by the ground terminal of host and extension set, and by host time pulse output end and extension set time pulse it catches
Obtain port connection, timer value when extension set arrives record time pulse rising edge.Time synchronization point is by host time arteries and veins
It is synchronous with the extension set timer spilling point of interruption to rush signal rising edge.
Step 4, time interval verification: the time interval between two pulses of the received time pulse signal of extension set is calculated
The average value of value, the average value is as extension set pulse interval timer overflow value；Specially by two adjacent input captures
It is the time interval value that extension set timer needs to modify that extension set timer value, which makes the value obtained after subtraction, and will be between the time
Extension set timer overflow value is used as every value；The time interval value can be with multiple repairing weld, filtering processing, to guarantee the essence of calibration
Degree.
Calculate the method tool of the average value of the time interval value between two pulses of the received time pulse signal of extension set
Body are as follows:
Acquire the time value of at least two pulses of the time pulse signal of host；
The difference for calculating the time value of two pulses obtains time interval value between adjacent pulse two-by-two；
The time interval value of calculating is filtered, and calculates the average value of time interval value；
The filter processing method be calculate multiple pulse interval values, and according to crystal oscillator frequency and pulse signal when
Between be spaced the Counter Value of the standard of determination, and computing counter value is defined according to the precision of crystal oscillator by relatively narrow section, deleted
Abnormal data outside section does average value operation to remaining valid data, operation result is finally added 0.5 and is rounded, is put down
Equal time interval value.
Step 5, impulsive synchronization verification: extension set obtains impulsive synchronization verification by time pulse acquisition mode, when extension set is caught
When receiving the pulse of host, resets extension set synchro timer count value and start new extension set synchro timer and overflow interruption.Arteries and veins
It rushes synchronization check and equally passes through time pulse acquisition mode and obtain, when extension set input capture end captures new host time pulse
When signal rising edge, resets extension set synchro timer count value and start new extension set synchro timer and overflow interruption.
The time pulse acquisition mode specifically: capture the time pulse of host time pulse generation module and extension set
Module connection, when extension set obtains the rising edge of the pulse of the time pulse signal of host, extension set is recorded as having received an arteries and veins
The input of punching.
For ease of description, the wireless phase measurement device host and wireless phase measurement extension set of the application can directly referred to as
For host and extension set, the host mentioned in the disclosure all refers to wireless phase measurement device host, and extension set all refers in the disclosure
Wireless phase measurement device extension set.
A kind of wireless Method for Phase Difference Measurement, as shown in figure 3, including the following steps:
Wireless phase measurement device is respectively set at each combining unit, is provided with a wireless phase measurement device
Host, multiple wireless phase measurement device extension sets；Host can not move after setting, when the lazy weight of extension set, extension set
Can be to be mobile, after phase before detection is easy to act as at combining unit, the extension set that current location can will be arranged in is mobile
It is measured again at other combining units.
(1) using the clock of host as benchmark, extension set is synchronized according to the time of host, so that extension set and host
Time and sampling time interval are consistent；The time interval of sampling is set on host can be set as arbitrary time interval, tool
Body can be 1s, 2s, 3s, 5s etc.；Using the clock of host as benchmark, method that extension set is synchronized according to the time of host
A kind of above-mentioned method for synchronizing time can be used.
(2) synchronized sampling: host and extension set acquire the secondary letter of substation secondary device simultaneously at same time point respectively
Number as acquisition signal；The secondary singal of acquisition is generally voltage or current signal.
(3) data processing: host and extension set carry out digital filtering processing to the signal respectively acquired respectively and obtain acquisition letter
Number phase and amplitude；The digital filtering processing is specially to sampled signal fast Fourier transform.Traditional alternating current piezoelectricity
The amplitude measurement of flow table is direct current signal will to be obtained after sine wave rectifying and wave-filtering, and sample acquisition amplitude information, utilizes the method
DC influence, noise, non-power frequency interference signals have been converted to direct current signal, and leading to measurement data, there are deviations, with dry
The increase disturbed, the increase of deviation possible several times, decades of times.And time-domain signal is converted to using FFT (Fast Fourier Transform (FFT))
Frequency-region signal can filter out direct current signal and noise jamming.Disclosed method directly utilizes ultra high speed A/D conversion to sample all-view signal,
Measurement data is stablized.
(4) data send extension set will treated phase and amplitude information by being wirelessly transmitted to host；
(5) host is by the phase and amplitude information for the acquisition signal that extension set is sent and host in adopting of acquiring of same time point
The phase and amplitude for collecting signal carries out vector calculus, obtains the phase difference of extension set signal lag host sampled signal；
The vector calculus specifically: the phase value of host subtracts the phase value of extension set, and difference is extension set signal lag master
The angle of machine sampled signal；
No-load voltage ratio can also be set in host, the free switching of secondary singal Yu a signal may be implemented according to no-load voltage ratio.
(6) data are corresponding: the phase result of vector calculus being transmitted to extension set, compares vector phase operation result and theory
Whether phase value is consistent, if unanimously, export result 1: the phase for acquiring signal is correct, and executes step (7)；Otherwise, it exports
As a result 2: acquiring the phase error of signal；
(7) (2)-(6) are repeated with the number of setting, if step (6) output every time is all result 1, phase is just
Really；If each step (6) output is all result 2, phase error；The setting of number is set according to specifically needing to set
Number can be more than or equal to 1.
Phase correctly illustrates that connection is correct, and fault-free, transformer can operate normally.When the knot of repeated detection output
Fruit is phase error, illustrates the possible connection error of transformer, needs to overhaul.Repeatedly measurement is to remove measuring device and may go out
Existing measurement error.Such as it possibly is present at measuring device clip at the signal acquisition of combining unit and enters in Current Voltage and connect at line
Touch it is bad, so as to cause measurement error.
After the notional phase value refers to transformer according to certain mode of connection connection, voltage or electricity between each phase
It is poor to flow existing notional phase between signal.
Simultaneously equal interval sampling, the phase obtained to calculating do subtraction simultaneously in the time synchronization point for host and extension set
Obtained phase difference is the phase of host and extension set.For its phase accuracy up to being no more than 1 ° per hour, specific calculating is as follows:
3600×10-8× 360 × 50=0.648 °
3600 represent one hour as 3600s in above formula, and 10-8It represents 0.01ppm (1/1000000ths), 360 represent
A cycle is 360 °, and 50 represent 50Hz under power frequency；
Communication Control between the host and extension set further include: extension set controls the storage of host data, extension set to host
The access of data, the shutdown of host control extensions.The storage of the extension set control host data refers to that extension set sends instruction, and host is worked as
It is received in forth screen and extension set sampled value and reference voltage (or electric current) amplitude and frequency shown saves, so as to subsequent access；
The extension set refers to that extension set is had access to the received extension set of host (including but not limited to this extension set) and transported through vector to the access of host data
Phase, amplitude information and host reference voltage (or electric current) amplitude and frequency information of calculation, so as to checkout facility progress and whether
There is measurement point omission etc.；The shutdown of host control extensions refers to that host maloperation shutdown needs main extension to verify or test again completion
Host sends command information when needing to close sustainable utilization of the extension set to maintain electricity, the behavior of automatic shutdown after extension set receives.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of wireless phase measurement device, it is characterized in that: including by the wireless phase measurement host of wireless connection and wireless
Phase measurement extension set；
Wireless phase measurement device host include host-processor, the first signal acquisition process module, the first wireless communication module,
First clock signal source module and time pulse generation module；The host-processor respectively with the first signal acquisition process mould
Block, the first wireless communication module, the first clock signal source module are connected with time pulse generation module；
Wireless phase measurement extension set includes extension set processor, second signal acquisition processing module, the second wireless communication module, second
Clock signal source module and time pulse trapping module；The extension set processor respectively with second signal acquisition processing module,
Two wireless communication modules, second clock signal source module are connected with time pulse trapping module.
2. a kind of wireless phase measurement device as described in claim 1, it is characterized in that: wireless phase measurement extension set further includes point
Machine display screen and key, the extension set display screen and key are connect with extension set processor respectively.
3. a kind of wireless phase measurement device as described in claim 1, it is characterized in that: the first signal acquisition process module includes
Sequentially connected first secondary singal acquisition module, the first signal amplification module and the first analog-to-digital conversion module；Second signal is adopted
Collecting processing module includes sequentially connected second secondary signal acquisition module, second signal amplification module and the second analog-to-digital conversion mould
Block.
4. a kind of method for synchronizing time, for realizing the time synchronization of host and extension set, the host and extension set are respectively phase
Measuring device, the extension set are at least one, characterized in that include the following steps:
The crystal oscillator frequency of host is carried out process of frequency multiplication as the clock signal of host according to the multiple of setting by step 1；
Step 2 generates time pulse signal by the timing of host timer according to the clock signal of host；
Step 3, extension set obtain the time pulse signal that host generates by time pulse acquisition mode；
Step 4, the average value for calculating time interval value between two pulses of the received time pulse signal of extension set, it is described flat
Mean value is as extension set pulse interval timer overflow value；
Step 5, extension set obtain impulsive synchronization verification by time pulse acquisition mode, when extension set captures the pulse of host,
It resets extension set synchro timer count value and starts new extension set synchro timer and overflow interruption, when extension set synchro timer overflows
The pulse of extension set is exported when interruption.
5. a kind of method for synchronizing time as claimed in claim 4, it is characterized in that: the time pulse acquisition mode specifically:
The time pulse trapping module of host time pulse generation module and extension set is connected, when extension set obtains the time pulse letter of host
Number pulse rising edge when, extension set is recorded as having received the input of a pulse.
6. a kind of method for synchronizing time as claimed in claim 4, it is characterized in that: calculating the received time pulse signal of extension set
The method of the average value of time interval value between two pulses specifically:
Acquire the time value of at least two pulses of the time pulse signal of host；
The difference for calculating the time value of two pulses obtains time interval value between adjacent pulse two-by-two；
The time interval value of calculating is filtered, the average value of time interval value is calculated.
7. one kind is in wireless Method for Phase Difference Measurement, characterized in that include the following steps: to be arranged at each combining unit without phase of line
Measuring device, the wireless phase measurement host of setting at one of combining unit, at other combining units in addition to host is set
Wireless phase measurement extension set is set；
(1) using the clock of host as benchmark, extension set is synchronized according to the time of host, so that the time of extension set and host
And sampling time interval is consistent；
(2) host and extension set acquire the secondary singal of substation secondary device simultaneously at same time point respectively；
(3) host and extension set are filtered the phase and amplitude for obtaining acquisition signal to the signal respectively acquired respectively；
(4) extension set will treated phase and amplitude information by being wirelessly transmitted to host；
(5) host believes the phase and amplitude information for the acquisition signal that extension set is sent and host in the acquisition that same time point acquires
Number phase and amplitude carry out vector calculus obtain extension set signal lag host sampled signal phase difference；
(6) phase result of vector calculus is transmitted to extension set, compare vector phase operation result and notional phase value whether one
It causes, if unanimously, export result 1: the phase for acquiring signal is correct, and executes step (7)；Otherwise, result 2 is exported: acquisition letter
Number phase error；
(7) (2)-(6) are repeated with the number of setting, if step (6) output every time is all result 1, phase is correct；Such as
The each step of fruit (6) output is all result 2, then phase error.
8. it is as claimed in claim 7 a kind of in wireless Method for Phase Difference Measurement, it is characterized in that: using the clock of host as benchmark,
Extension set is used into a kind of such as the described in any item time synchronization sides claim 2-4 according to the method that the time of host synchronizes
Method.
9. as claimed in claim 7 a kind of in wireless Method for Phase Difference Measurement, it is characterized in that: the filtering processing is specially to adopting
Sample signal fast Fourier transform.
10. one kind as claimed in claim 7 is in wireless Method for Phase Difference Measurement, it is characterized in that: the vector calculus specifically: main
The phase value of machine subtracts the phase value of extension set, and difference is the angle of extension set signal lag host sampled signal.
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Cited By (1)
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