CN106526319A - Synchronous phase measurement method and system - Google Patents
Synchronous phase measurement method and system Download PDFInfo
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- CN106526319A CN106526319A CN201611012460.1A CN201611012460A CN106526319A CN 106526319 A CN106526319 A CN 106526319A CN 201611012460 A CN201611012460 A CN 201611012460A CN 106526319 A CN106526319 A CN 106526319A
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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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Abstract
The invention discloses a synchronous phase measurement method. The method comprises the following steps that: time standards of a standard voltage and a measured voltage are determined to be kept to be consistent, wherein at least one measured voltage is provided; phases of the standard voltage and the measured voltage are measured; the phase measurement result of the standard voltage is compared with the phase measurement result of the measured voltage; according to the comparison result, phase information of the measured voltage is determined; and phase information of the standard voltage and the measured voltage are displayed. In addition, the invention also discloses a synchronous phase measurement system. Therefore, phase measurement between power transmission networks, between power distribution networks, and between the power transmission networks and the power distribution networks is realized; a problem of difficult phase measurement is solved; the measurement range is extended; and accuracy of the phase measurement is improved.
Description
Technical field
The present invention relates to electric detecting technology field, and in particular to a kind of same pacing phase method and system.
Background technology
With the fast development and the propulsion of electricity market process of electrical network, the complexity of Operation of Electric Systems increasingly increases
Greatly, the stability requirement more and more higher to power system.Synchronized phasor measurement technology may apply to many sides of power system
Face, for example, the state estimation of power system, statically stable monitoring, the prediction of transient stability and control and accident analysis etc.
Deng with the extensive application of GPS (GPS), real-time phasor measuring set (PMU, the Phase based on GPS
Measurement Unit) solve the problems, such as that electrical power system wide-area spatial synchronization is measured well, and define electrical network wide area
Measuring system (WAMS, Wide Area Measurement System).PMU (passes through under the unified time coordinate system of the whole network
Receive the synchronizing clock signals of GPS), sampling, GPS synchronized phasors are synchronized to the voltage and current of power system difference node
E measurement technology can obtain real time phasor, frequency and amplitude, obtain preferable application in power measurement field.
As distribution line is installed mostly in batches, and the time period for crossing over is longer, construction team's peopleware level
Uneven, it is chaotic to be easily caused wiring, thus Three-Phase Transformer is load unbalanced, low-voltage the problems such as occur, state's household electrical appliances in recent years
In order to reduce line loss, the platform area for strengthening carrying out the fine-grained management for radio area comprehensively user confirms and phase for net company
Work is not recognized, the survey of power circuit is mutually a job indispensable during electric power system power distribution circuit O＆M is overhauled.Due to
Traditional separate measurement can only be judged by distributing net platform region user's identification instrument etc., if platform area high voltage side of transformer is separate
Mistake is accessed, the same mistake of the separate judgement of distribution is may result in, therefore is highly desirable to set up the effective of this area unification
Separate bioassay standard, so as to solve the problems, such as between power transmission network, between power distribution network, and the separate measurement between power transmission network and power distribution network.
The content of the invention
To solve existing technical problem, the embodiment of the present invention provides a kind of method of guarantee equipment alarm clock effectiveness
And system,
To reach above-mentioned purpose, what the technical scheme of the embodiment of the present invention was realized in：
In a first aspect, the embodiment of the present invention provides a kind of same pacing phase method, methods described includes：
Guarantee that normal voltage and the time standard of tested voltage are consistent, the tested voltage at least includes one；
Determine the separate phase place of the normal voltage and the tested voltage；
Separate phase determination result of the separate phase determination result of the normal voltage with the tested voltage is carried out
Relatively；
The separate information of the tested voltage is determined according to comparative result；
It is with reference in a first aspect, in the first possible implementation of the invention, described according to comparative result determines
The separate information of tested voltage, including：
If comparative result be separate phase contrast within preset range, judge the separate and mark of the tested voltage
Quasi- voltage it is separate identical.
With reference in a first aspect, in second possible implementation of the present invention, it is described determine the normal voltage and
The separate phase place of the tested voltage, and by the phase of the separate phase determination result of the normal voltage and the tested voltage
Other phase determination result is compared, including：
The first separate phase place of the first separate phase place of the normal voltage and the tested voltage is determined, according to the standard
First separate phase place of voltage calculates the second separate phase place and the other phase place of third phase of the normal voltage；
Will be the first of the normal voltage the separate phase place, the second separate phase place and/or the other phase place of third phase tested with described
First separate phase place of voltage is compared.
With reference to second possible implementation of first aspect, in the third mode in the cards, the basis
Comparative result determines that the separate information of the tested voltage includes：
Root determines the first separate information of the tested voltage according to comparative result, according to the first phase of the tested voltage
Other information determines the whether anti-phase letter of the second separate information of the tested voltage, the other information of third phase and the tested voltage
Breath.
With reference in a first aspect, in the 4th kind of possible implementation, the normal voltage and described tested of determining
The separate phase place of voltage, and the separate phase place of the separate phase determination result of the normal voltage and the tested voltage is surveyed
Determine result to be compared, including：
The first separate phase place of the first separate phase place and the tested voltage of the normal voltage is determined, according to the mark
First separate phase place of quasi- voltage calculates the second separate phase place and the other phase place of third phase of the normal voltage, according to described tested
First separate phase place of voltage calculates the second separate phase place and the other phase place of third phase of the tested voltage；
Will be the first of the normal voltage the separate phase place, the second separate phase place and/or the other phase place of third phase tested with described
First separate phase place of voltage, the second separate phase place and/or the other phase place of third phase are compared.
With reference to the 4th kind of possible implementation of first aspect, in the 5th kind of mode in the cards, the basis
Comparative result determines that the separate information of the tested voltage includes：
Determine that the first separate information of the tested voltage, the second separate information, third phase compare information according to comparative result
And whether anti-phase information.
With reference in a first aspect, in the 6th kind of possible implementation, methods described also includes：Determine the normal voltage
With the amplitude and frequency of the tested voltage, and the amplitude and frequency of the normal voltage and the tested voltage are shown.
Second aspect, the embodiment of the present invention provide a kind of same pacing phase system, it is characterised in that the system includes：
At least two low pressure survey phase device, and the low pressure surveys phase device to be included：
Voltage sample module, for determining separate phase information, the amplitude letter of the normal voltage and the tested voltage
Breath and frequency information；
Control process module, for described by the separate phase information of normal voltage and the separate phase of the tested voltage
Position information carries out logical analyses, and controls other modules that the low pressure surveys phase device；
Time synchronized module, for being consistent normal voltage and the time standard of tested voltage；
Wireless communication module, for the long-distance radio communication that at least two low pressure is surveyed between phase device；
Display unit, shows separate phase information, amplitude information and the frequency of the normal voltage and the tested voltage
Rate information；
Power module, for providing power supply；
Memory module, for store the separate phase information of the normal voltage and the tested voltage, amplitude information with
And frequency information.
With reference to second aspect, in the first possible implementation, the time synchronized module is using during the unification of the whole world
Clock (UTC, Coordinated Universal Time), the wireless communication module are GPRS wireless communication modules.
With reference to the first possible implementation of second aspect, in second possible implementation, the low pressure
Surveying phase device is used to measure the three-phase voltage of below 1kV.
As can be known from the above technical solutions, same pacing phase method provided in an embodiment of the present invention and system, by standard electric
Same pacing phase is carried out between pressure and tested voltage, and is compared phase result is surveyed, finally obtain the survey phase result of tested voltage,
Establish a set of effective survey phase standard, realize between power transmission network, between power distribution network, and power transmission network and power distribution network between it is separate
Measurement, solves a difficult problem for separate measurement, simultaneously as same pacing phase method provided in an embodiment of the present invention and system are employed
Unified time standard synchronisation is measured and long-distance radio communication, so as to expand measurement range, improves the accuracy of separate measurement.
Description of the drawings
In accompanying drawing (which is not necessarily drawn to scale), similar reference phase described in different views
As part.Similar reference numerals with different letter suffix can represent the different examples of similar component.Accompanying drawing is with example
Unrestriced mode generally shows each embodiment discussed herein.
Fig. 1 is a kind of schematic flow sheet of same pacing phase method provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of same pacing phase system provided in an embodiment of the present invention；
Fig. 3 is a kind of survey facies principle schematic block diagram of same pacing phase system provided in an embodiment of the present invention.
Specific embodiment
A kind of same pacing phase method provided in an embodiment of the present invention and system are by determining normal voltage and tested voltage
Time standard is consistent；Determine the separate phase place of the normal voltage and the tested voltage；By the phase of the normal voltage
Other phase determination result is compared with the separate phase determination result of the tested voltage；The quilt is determined according to comparative result
Survey the separate information of voltage；The separate information of the normal voltage and the tested voltage is shown, a set of effective survey is established
Phase standard, realizes between power transmission network, between power distribution network, and the separate measurement between power transmission network and power distribution network, solves separate survey
A difficult problem for amount.
A kind of same pacing phase method provided in an embodiment of the present invention and system are said with reference to specific embodiment
It is bright.
Embodiment 1
Fig. 1 is a kind of schematic flow sheet of same pacing phase method provided in an embodiment of the present invention.With reference to Fig. 1, the present invention is real
A kind of same pacing phase method for applying example offer includes：
101st, guarantee that normal voltage and the time standard of tested voltage are consistent, tested voltage at least includes one.
Specifically, a normal voltage is set first, it is ensured that normal voltage wiring is correct and be positive phase sequence, and guarantee standard electric
Pressure is consistent with the time standard of tested voltage, to realize both synchro measures.For example, time standard here can be adopted
With global unified clock (UTC, Coordinated Universal Time).Tested voltage can be one, it is possible to have
Multiple, if tested voltage has multiple, each tested voltage is in measurement still using the time standard unified with normal voltage.
102nd, the separate phase place of bioassay standard voltage and tested voltage.Here, the three-phase of normal voltage is referred to as into mark
Quasi- voltage it is first separate, second is separate and third phase not, the three-phase of tested voltage is referred to as into the first phase of tested voltage
Not, second is separate and third phase is other.
Specifically, this step can be carried out in following two modes：
102a, first, the first separate phase place of the first separate phase place and tested voltage of bioassay standard voltage.Then, root
According to the principle that the positive sequence phase contrast of three-phase voltage is 120 ° and 180 ° of voltage inversion, can by the first separate phase place of normal voltage
With the extrapolate normal voltage second separate phase place and the other phase place of third phase.
102b, first, the first separate phase place of the first separate phase place and tested voltage of bioassay standard voltage.Then, root
According to the principle that the positive sequence phase contrast of three-phase voltage is 120 ° and 180 ° of voltage inversion, pushed away by the first separate phase place of normal voltage
The second separate phase place and the other phase place of third phase of normal voltage are calculated, tested electricity is extrapolated by the first separate phase place of tested voltage
The second separate phase place and the other phase place of third phase of pressure.
103rd, by the separate phase determination result of the separate phase determination result of the normal voltage and the tested voltage
It is compared.According to the difference of step 102 embodiment, performing this step equally has following two modes：
103a, be measured according to above-mentioned 102a after, by the first of normal voltage the separate phase place, the second separate phase place and
Separate phase place is compared three separate phase places respectively with the first of tested voltage, or comparison program is set as working as standard
The a certain separate phase place of voltage with the first of tested voltage separate phase place comparative result be defined as it is same separate, then stop compare.
103b, be measured according to above-mentioned 102b after, just the first separate phase place of normal voltage, the second separate phase place and
Separate phase place, the second separate phase place and the other phase place of third phase are compared the other phase place of third phase respectively two-by-two with the first of tested voltage
Compared with, or comparison program is set as being defined as same separate by comparative result two-by-two, then stop the comparison of this pair of separate phase place.
104th, the separate information of the tested voltage is determined according to comparative result.From Multipoint synchronous measuring principle, together
The same separate voltage of step electrical network should be consistent in the phase place at any identical moment, in the same manner, in any identical moment and previous phase
Other voltage-phase answers advanced 120 °, answers delayed 120 ° with latter separate voltage-phase.Therefore according to the principle and the ratio of step 103
Relatively result, it may be determined that the separate information of tested voltage three-phase, here it is possible to separate phase contrast is set in a less phase
Potential difference scope, i.e., the preset range of separate phase contrast, if comparative result be separate phase contrast within preset range, judge quilt
Survey voltage separate and normal voltage it is separate identical.For example, preset range can be set as ± 15 °.Similarly, perform this step
Suddenly following two modes are included：
104a, carry out 103a steps after, the first separate information of tested voltage, Ran Hougen can determine according to comparative result
According to the first separate information of tested voltage by calculating the second separate phase place for determining tested voltage, the other phase place of third phase, then
By the second of tested voltage the separate phase place and the 3rd don't phase place be compared respectively, so as to can according to Multipoint synchronous measuring principle
The second separate information and third phase of tested voltage are determined than information, and tested voltage can also be determined according to comparative result
Whether anti-phase information, i.e., whether connect sequence occur in that it is anti-phase.
104b, carry out 103b steps after, according to comparative result therein can determine tested voltage the first separate information,
Second separate information, third phase are than information and whether anti-phase information.
In addition, the same pacing phase method in the embodiment of the present invention can also be comprised the following steps in addition to above-mentioned steps：It is aobvious
Show the separate information of normal voltage and tested voltage, separate information here can include the separate and separate of normal voltage three-phase
Phase place, and separate, the separate phase place of tested voltage three-phase that determined according to comparative result and whether anti-phase.
In addition, the same pacing phase method in the embodiment of the present invention can also include：Bioassay standard voltage and tested voltage
Amplitude and frequency, and show the amplitude and frequency of normal voltage and tested voltage.Here step display can be with above-mentioned display
Step is set as that same process is carried out.
The electrical network networked by alternating current circuit and the electrical network in same area belong to synchronised grids, therefore the present invention is implemented
The same pacing phase method that example is provided is applied to the separate measurement of any one synchronised grids internal wiring or user, so as to be capable of achieving
Between power transmission network, between power distribution network, and the separate measurement between power transmission network and power distribution network, survey phase scope wider.
Embodiment 2
Fig. 2 is the structural representation that the low pressure in a kind of same pacing phase system provided in an embodiment of the present invention surveys phase device.
With reference to Fig. 2, a kind of same pacing phase system provided in an embodiment of the present invention includes that 4 low pressure survey phase device.Wherein, it is low
Pressure surveys phase device 2 to be included：Voltage sample module 21, control process module 22, time synchronized module 23, wireless communication module 24,
Display unit 25, power module 26 and memory module 27.
Specifically, voltage sample module 21 is used for the separate phase place letter for determining the normal voltage and the tested voltage
Breath, amplitude information and frequency information.Control process module 22 is for the separate phase information and tested voltage to normal voltage
Separate phase information carries out logical analyses, and control low pressure survey the voltage sample module 21 of phase device, time synchronized module 23,
Other modules such as wireless communication module 24, display unit 25, power module 26, memory module 27.Time synchronized module 23 is used for
It is consistent normal voltage and the time standard of tested voltage, it is preferable that when time synchronized module 23 can be unified using UTC
Clock.The long-distance radio communication that wireless communication module 24 is surveyed between phase device for 4 low pressure in same pacing phase system, it is preferable that
Wireless communication module 24 can be GPRS wireless communication modules.Display unit 25 is used for the phase for showing normal voltage and tested voltage
Other phase information, amplitude information and frequency information, separate phase information here can include the separate of normal voltage three-phase
With separate phase place, and separate, the separate phase place of tested voltage three-phase that determined according to comparative result and whether anti-phase.Power supply mould
Block 26 is used to provide power supply for whole system.Memory module 27 is used for the above-mentioned separate phase place for storing normal voltage and tested voltage
Information, amplitude information and frequency information.
Fig. 3 is a kind of survey facies principle schematic block diagram of same pacing phase system provided in an embodiment of the present invention.
With reference to Fig. 3, the course of work of same pacing phase system provided in an embodiment of the present invention is as follows：
First, normal voltage is accessed low-voltage remote and surveys phase device 2, it is ensured that wiring by the separate measurement point of selection standard voltage
It is correct and be positive phase sequence.
Then, tested voltage is respectively connected to tested end low-voltage remote survey phase device 2a, tested end low-voltage remote to survey and mutually fill
Put 2b and tested end low-voltage remote surveys phase device 2c, it is anticipated that martingale, by respective time synchronized module
23, it is ensured that time standard is consistent.
Thereafter, after start, the low-voltage remote of configuration standard voltage side surveys phase device 2a as main frame, tested voltage side it is low
Long-range phase device 2b, 2c and the 2d of surveying of pressure is used as slave.
Thereafter, according to main frame and the status display of slave, it is ensured that its time synchronization module 23 obtains arm's length standard clock, lead to
Cross 24 main frame of wireless communication module and set up with slave and be wirelessly connected.
Finally, voltage sample module 21 measures separate phase place, voltage magnitude and the frequency of normal voltage and tested voltage, Jing
Cross logical analyses of the control process module 22 to the separate phase information of the separate phase information and tested voltage of normal voltage
Journey, obtains comparative result, and the separate phase information and whether anti-phase information of tested voltage three-phase are then determined according to comparative result,
Show finally by display unit 25 voltage magnitude and phase place and tested voltage of main frame and slave separate phase information and
Whether anti-phase information.
Although this surveys the three-phase voltage that phase device can only measure below 1000V with the low-voltage remote of pacing phase system, but
Still the separate measurement to Synchronous High voltage electrical network can be met, at this moment only need to be measured in high-voltage fence secondary side, therefore should
It is of many uses with pacing phase system, it is capable of achieving between power transmission network, between power distribution network, and the separate survey between power transmission network and power distribution network
Amount.
From the above description with understand in practice, same pacing phase method provided in an embodiment of the present invention and system, by mark
Same pacing phase is carried out between quasi- voltage and tested voltage, and is compared phase result is surveyed, finally obtain the survey phase of tested voltage
As a result, establish it is a kind of effectively survey phase standard, realize between power transmission network, between power distribution network, and power transmission network and power distribution network between
Separate measurement, solve a difficult problem for separate measurement, simultaneously as same pacing phase method provided in an embodiment of the present invention and system
The measurement of unified time standard synchronisation and long-distance radio communication are employed, so as to expand measurement range, separate measurement is improve
Accuracy.
The above only expresses the preferred embodiment of the present invention, and its description is more concrete and in detail, but can not be because
This and be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art,
On the premise of without departing from present inventive concept, some deformations, improvement can also be made and substituted, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can adopt hardware embodiment, software implementation or the shape with reference to the embodiment in terms of software and hardware
Formula.And, the present invention can use storage using the computer for wherein including computer usable program code at one or more
The form of the computer program implemented on medium (including but not limited to disk memory and optical memory etc.).
The present invention be with reference to method according to embodiments of the present invention, equipment (system), and computer program flow process
Figure and/or block diagram are describing.It should be understood that can be by computer program instructions flowchart and/or each stream in block diagram
The combination of journey and/or square frame and flow chart and/or flow process and/or square frame in block diagram.These computer programs can be provided
The processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced for reality by the instruction of computer or the computing device of other programmable data processing devices
The device of the function of specifying in present one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in and can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory is produced to be included referring to
Make the manufacture of device, the command device realize in one flow process of flow chart or one square frame of multiple flow processs and/or block diagram or
The function of specifying in multiple square frames.
These computer program instructions can be also loaded in computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented process, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow process of flow chart or multiple flow processs and/or block diagram one
The step of function of specifying in individual square frame or multiple square frames.
The above, only presently preferred embodiments of the present invention is not intended to limit protection scope of the present invention.
Claims (10)
1. a kind of same pacing phase method, it is characterised in that methods described includes：
Guarantee that normal voltage and the time standard of tested voltage are consistent, the tested voltage at least includes one；
Determine the separate phase place of the normal voltage and the tested voltage；
Separate phase determination result of the separate phase determination result of the normal voltage with the tested voltage is compared；
The separate information of the tested voltage is determined according to comparative result.
2. same pacing phase method according to claim 1, it is characterised in that it is described determined according to comparative result it is described tested
The separate information of voltage, including：
If comparative result be separate phase contrast within preset range, judge the separate and standard electric of the tested voltage
That what is pressed is separate identical.
3. same pacing phase method according to claim 1, it is characterised in that the measure normal voltage and the quilt
Survey the separate phase place of voltage, and by the separate phase place of the separate phase determination result of the normal voltage and the tested voltage
Measurement result is compared, including：
The first separate phase place of the first separate phase place of the normal voltage and the tested voltage is determined, according to the normal voltage
The first separate phase place calculate the second separate phase place and the other phase place of third phase of the normal voltage；
By the first of the normal voltage the separate phase place, the second separate phase place and/or the other phase place of third phase and the tested voltage
The first separate phase place be compared.
4. same pacing phase method according to claim 3, it is characterised in that it is described determined according to comparative result it is described tested
The separate information of voltage includes：
Root determines the first separate information of the tested voltage according to comparative result, according to the first separate letter of the tested voltage
Breath determines the whether anti-phase information of the second separate information, the other information of third phase and the tested voltage of the tested voltage.
5. same pacing phase method according to claim 1, it is characterised in that the measure normal voltage and the quilt
Survey the separate phase place of voltage, and by the separate phase place of the separate phase determination result of the normal voltage and the tested voltage
Measurement result is compared, including：
The first separate phase place of the first separate phase place and the tested voltage of the normal voltage is determined, according to the standard electric
First separate phase place of pressure calculates the second separate phase place and the other phase place of third phase of the normal voltage, according to the tested voltage
The first separate phase place calculate the second separate phase place and the other phase place of third phase of the tested voltage；
By the first of the normal voltage the separate phase place, the second separate phase place and/or the other phase place of third phase and the tested voltage
The first separate phase place, the second separate phase place and/or the other phase place of third phase be compared.
6. same pacing phase method according to claim 5, it is characterised in that it is described including：It is described true according to comparative result
The separate information of the fixed tested voltage includes：
First separate information of the tested voltage, the second separate information, third phase are determined than information according to comparative result and
Whether anti-phase information.
7. same pacing phase method according to claim 1, it is characterised in that methods described also includes：Show the standard
The separate information of voltage and the tested voltage.
8. same pacing phase method according to claim 1, it is characterised in that methods described also includes：Determine the standard
The amplitude and frequency of voltage and the tested voltage, and show the amplitude and frequency of the normal voltage and the tested voltage.
9. a kind of same pacing phase system, it is characterised in that the system includes：
At least two low pressure survey phase device, and the low pressure surveys phase device to be included：
Voltage sample module, for determine the separate phase information of the normal voltage and the tested voltage, amplitude information and
Frequency information；
Control process module, for believing to the separate phase place by the separate phase information of normal voltage and the tested voltage
Breath carries out logical analyses, and controls other modules that the low pressure surveys phase device；
Time synchronized module, for being consistent normal voltage and the time standard of tested voltage；
Wireless communication module, for the long-distance radio communication that at least two low pressure is surveyed between phase device；
Display unit, shows separate phase information, amplitude information and the frequency letter of the normal voltage and the tested voltage
Breath；
Power module, for providing power supply；
Memory module, for storing separate phase information, amplitude information and the frequency of the normal voltage and the tested voltage
Rate information.
10. same pacing phase system according to claim 8, it is characterised in that the time synchronized module is using whole world system
One clock (UTC, Coordinated Universal Time), the wireless communication module are GPRS wireless communication modules.
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| CN108333441A (en) * | 2018-05-03 | 2018-07-27 | 广东电网有限责任公司 | Secondary phase checking device and system |
| CN108768574A (en) * | 2018-05-03 | 2018-11-06 | 杭州讯能科技有限公司 | A kind of synchronous method of network clocking, device, equipment and readable storage medium storing program for executing |
| CN109857975A (en) * | 2018-12-29 | 2019-06-07 | 重庆邮电大学 | A kind of electric energy meter platform area and three-phase automatic identification method |
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| CN101943719A (en) * | 2010-09-09 | 2011-01-12 | 上海希明电气技术有限公司 | Shared-frequency asynchronous phase-checking method |
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| CN105629084A (en) * | 2015-12-27 | 2016-06-01 | 国家电网公司 | Phase-checking device special for electric power |
| CN105785143A (en) * | 2016-04-22 | 2016-07-20 | 国家电网公司 | Online low-voltage line phase checking device and phase checking method thereof |
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