CN112345837A - Electronic phase indicating device and application method thereof - Google Patents
Electronic phase indicating device and application method thereof Download PDFInfo
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Abstract
An electronic phase indicating device comprising: the device comprises a control module, a sampling module, a time service module, a communication module and a phase display module, wherein the sampling module, the time service module, the communication module and the phase display module are connected with the control module. The invention adopts a modular structure, can be integrated and installed on a circuit, and has the advantages of mature technology, stability, reliability and convenient installation. The invention adopts a GPS time service module, and ensures that the accuracy rate of phase checking is 100 percent through the color of a receiving module and the phase sequence display of a handheld signal receiver. The control module is flexible in installation and site selection, convenient to install, small in workload, high in working efficiency, good in sealing performance due to the adoption of an anti-interference and anti-pollution shell, free of interference of external natural conditions such as rainwater, ice and snow, dust and corrosive gas and human factors, and safe and reliable operation of an internal control circuit board is ensured.
Description
Technical Field
The invention relates to an electronic phase indicating device and an application method thereof, belonging to the technical field of power industry.
Background
The phase indication has important significance in the design, construction and maintenance work of the power transmission line, can ensure that the power transmission line project successfully transmits power within a planned range, can provide a correct phase arrangement mode for line operation and maintenance personnel, and provides a safety foundation for the operation and maintenance work. In actual work, the phase identification of the transmission line is generally required to be carried out in a charged mode.
At present, the phase place of electric wire netting is instructed mainly to lean on artifical nuclear phase, carries out three kinds of colours of yellow green red on transformer substation's interval, circuit tower and indicates the phase place, because new, old circuit tie point is more, and the condition that old circuit partly changed into is more, will lead to the phase place to instruct the confusion, and each region management level is inconsistent moreover, and the normal degree of installation phase place sign is different, also can make design and fortune dimension personnel misjudge the phase place. In order to avoid phase errors, designers often need to check the phase along the whole line until the phase is checked into a transformer substation interval, so that the labor intensity is greatly increased, and the design efficiency is influenced.
In recent years, due to the fact that the phase direction board or the phase color code cannot be replaced in time, circuit phase errors are caused during line reconstruction, construction period is delayed, engineering cannot normally transmit power on schedule, and power supply reliability of the whole power grid is affected. Therefore, it is urgently needed to develop an electronic phase indicator, which accurately judges the phase of each phase of power transmission line on the premise of not influencing the normal operation of power equipment in actual operation, and is installed on the corresponding pole tower lead with the phase change from the beginning end to the end of the line, so that the time for a designer to check the phase is saved, the design period is shortened, and the workload of collecting basic data of a line operation and maintenance unit is reduced.
In summary, no accurate and fast novel electronic phase indication method is available at present.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides an electronic phase indicating device.
The invention also provides an application method of the device.
The principle adopted by the invention is as follows: a, B, C three phases are fixed in the same power grid, the phase difference of A, B, C is constant, and the phase arrangement at any position can be accurately judged by comparing the current or voltage waveform at any position of the power transmission line with the current or voltage waveform at a reference position.
The invention collects the current and voltage waveforms of the transmission line and samples the characteristic value lambda of any phase waveform at the sampling side of the transmission linetAnd λ at the reference side0And analyzing and comparing, and judging the phase at each position according to the amplitude and time characteristic among the three-phase waveforms.
Because the high-voltage transmission line requires the equipment to have very strong insulating property, if the current and voltage amplitude of the line needs to be accurately measured, certain difficulty exists at present, but the peak value of the sampling side can not be an accurate numerical value, only the peak value time t and the change rule thereof need to be judged, the sampling position on the line can be flexibly determined, the size and the insulating requirement of the sampling device are reduced on the basis of not influencing the time t and the change rule, and the cost is greatly reduced.
The technical scheme of the invention is as follows:
an electronic phase indicating device comprising: the system comprises a control module, a sampling module, a time service module, a communication module and a phase display module, wherein the sampling module, the time service module, the communication module and the phase display module are connected with the control module;
the sampling module is composed of a current or voltage transformer, is safely and firmly installed on a power transmission line tower, reasonably adjusts the installation position according to the requirement of insulation performance of each voltage grade, and is responsible for measuring the current and voltage waveforms of the line running in real time when the voltage is higher and can be farther away from the electrified line, and transmits the measured data to the control module in time;
the control module adopts a single chip microcomputer, receives the sampling data of the sampling module, performs current or voltage conversion and amplification, and converts the sampling waveform into a digital signal by an internal AD (analog-to-digital) module;
meanwhile, the control module also performs unified calibration on internal time through the time service module, so that clocks on the sampling side and the reference side are kept consistent and are matched with the clock of the whole power grid system;
the phase display module sends a sampling command to the control module, the time service module sends a synchronous pulse to trigger a sampling signal to trigger sampling, and the control module immediately measures the time peak value time t of each phase reaching the peak valueATime of peak tBTime of peak tC(ii) a A, B, C three phases are judged after analysis and comparison, the ABC three phases based on the whole power grid are fixed and unchanged in the analysis and comparison method, and t isA、tB、tCThe following rules are satisfied:
tA-tB＝nπ+120,tA-tC＝nπ+240；
the phase display module is used for displaying the phase of the tested line and is connected with the control module in a super-regenerative remote control mode;
the phase display module comprises a phase indicating unit and a communication trigger signal generating unit;
the phase indicating unit indicates the phase in a form of character indication;
or the phase indicating unit indicates the phase in a mode that the indicating lamp distinguishes the indicating phase; for example, the phase indication unit may be composed of three-color Led lamps (yellow, green and red), and if the control module determines that the phase is phase a, the phase a is turned on, and the phase B, C is also turned on;
the communication trigger signal generating unit is used for sending a trigger signal to the control module during phase detection so that the communication module works to send peak time information. The wireless control device can send a trigger signal to the control module during phase detection, so that the communication module works to send peak time information.
According to the invention, the time service module preferably adopts GPS satellite time service.
According to the invention, the time service module is preferably a north-sky BS-280 module, the north-sky BS-280 module sends latitude, longitude and time information to the control module through a serial port, and outputs 1ms high level at a pin every second for synchronous triggering. The north-sky BS-280 module does not need programming, can continuously send data through a serial port after being electrified and successfully positioned by a satellite, and the control module only needs to analyze and process the data.
According to the invention, the communication module adopts a GPRS module, a plurality of communication modules are adopted according to the electronic phase indicating device, and the communication modules are divided into a reference side and a sampling side according to functions, wherein the reference side is used for collecting the peak time t of ABC three phases of the whole power gridA、tB、tC，The sampling side is used for collecting the line peak time t of the phase to be measured0，The electronic phase indicating devices on the reference side and the sampling side are respectively communicated with each other in real time through respective communication modules;
the control module controls the communication module to send short messages according to the peak time of each phase;
the reference side is the outgoing line position of the transformer substation, and in practical application, the reference side can be reasonably arranged at a convenient traffic position according to the characteristics of the terrain;
the sampling side refers to any line tower position needing phase indication, including a general strain tower, a T joint, a pi joint, a phase exchange position and the like;
after the control module measures the peak time of each phase, time information is sent through a short message, and the peak time t of two places is measured0And tA、tB、tCThe comparison is performed to obtain A, B, C phases of three-phase power.
Preferably, according to the present invention, the GPRS module is a SIM800L module, which communicates with the control module via a serial port.
The method for applying the device to phase indication comprises the step of setting an absolutely accurate phase reference value, and is characterized in that the phase indication devices of other towers of the power transmission line judge ABC three phases by comparing with a reference side, and specifically comprises the following steps:
1) the electronic phase indicating devices are respectively installed at three phase positions of an outgoing line of a transformer substation to carry out multi-person supervision type manual phase checking, so that absolute accuracy of phase indication of a reference position is guaranteed;
2) the checker holds the electronic phase indicating device by hand to check the accurate phase at the tower, for example: the electronic phase indicating device is respectively arranged at the position of a line corner tower, the position of a special tangent tower, the position of a convenient core phase, the position of a phase change, and the T connection and disconnection positions of a line.
According to the invention, the sampling module preferably measures the phase line of the power transmission line in real time, and continuously acquires the current I of the instant operation phasea、Ib、IcOr phase voltage Va、Vb、VcAnd synchronously transmitting the measurement information to the control module.
According to the invention, the control module receives the output signal phase current I of the measuring modulea、Ib、 IcOr phase voltage Va、Vb、VcConverting the sampled waveform into a digital signal by the internal AD; meanwhile, the control module calibrates the internal time t through the time service module, triggers sampling by synchronous pulses sent by the time service module when receiving a sampling command, and measures the time peak value time t of each phase reaching the peak value1Peak time t2Time of peak t3(ii) a The control module controls the communication module to send the peak time of each phase through short messages, and A, B, C three phases are judged after analysis and comparison.
According to the invention, the method for judging A, B, C three phases after analysis and comparison preferably comprises the following steps: according to the rule that tA-tB is n pi +120 and tA-tC is n pi +240, in the same power grid with the same clock, the peak time of the B-phase waveform always lags behind the peak time of the A-phase waveform n pi +120, the peak time of the C-phase waveform always lags behind the peak time of the B-phase waveform n pi +120, the sampling module sends the peak time of the waveform at the sampling side to the A-phase at the reference side through sending a short message, and the three phases ABC are judged through mutual comparison and calculation.
The invention has the advantages that:
the device and the application method fill up the technical blank in the technical field, can save the time of phase checking by designers when designing the line construction drawing, shorten the design period and can be widely applied to high-voltage transmission lines.
1. The invention adopts a modular structure, comprising: the single-chip microcomputer MSP430F149, the mutual inductor, the power supply module, the GPS time service module, the GPRS communication module, the super-regenerative remote control and the like complete the phase indication function, can be integrated and installed on a circuit, and has the advantages of mature technology, stability, reliability and convenience in installation.
2. The invention adopts a GPS time service module, and ensures the accuracy rate of phase checking to be 100 percent through the color of a receiving module and the phase sequence display of a handheld signal receiver.
3. The control module is flexible in installation and site selection, convenient to install, small in workload, high in working efficiency, good in sealing performance due to the adoption of an anti-interference and anti-pollution shell, free of interference of external natural conditions such as rainwater, ice and snow, dust and corrosive gas and human factors, and safe and reliable operation of an internal control circuit board is ensured.
4. The invention can save the time for checking the design phase of the construction drawing and improve the accuracy rate of phase checking.
5. The invention can save the installation cost of the phase indicator and the cost of painting the indication color code in the later period, and improve the economy; the workload of collecting the basic data of the line operation and maintenance unit is reduced.
Drawings
FIG. 1 is a circuit block diagram of an electronic phase indicating device according to the present invention;
FIG. 2 is a waveform of a three-phase power source detected by the present invention;
FIG. 3 is a specific GPS module selected for use in an embodiment;
fig. 4 shows a specific GPRS module selected in the embodiment.
Detailed Description
The present invention will be described in detail with reference to examples, but is not limited thereto.
As shown in fig. 1-4.
Examples 1,
An electronic phase indicating device comprising: the system comprises a control module, a sampling module, a time service module, a communication module and a phase display module, wherein the sampling module, the time service module, the communication module and the phase display module are connected with the control module;
the sampling module is composed of a current or voltage transformer, is safely and firmly installed on a power transmission line tower, reasonably adjusts the installation position according to the requirement of insulation performance of each voltage grade, and is responsible for measuring the current and voltage waveforms of the line running in real time when the voltage is higher and can be farther away from the electrified line, and transmits the measured data to the control module in time;
the control module adopts a single chip microcomputer, receives the sampling data of the sampling module, performs current or voltage conversion and amplification, and converts the sampling waveform into a digital signal by an internal AD (analog-to-digital) module;
meanwhile, the control module also performs unified calibration on internal time through the time service module, so that clocks on the sampling side and the reference side are kept consistent and are matched with the clock of the whole power grid system;
the phase display module sends a sampling command to the control module, the time service module sends a synchronous pulse to trigger a sampling signal to trigger sampling, and the control module immediately measures the time peak value time t of each phase reaching the peak valueATime of peak tBTime of peak tC(ii) a A, B, C three phases are judged after analysis and comparison, the ABC three phases based on the whole power grid are fixed and unchanged in the analysis and comparison method, and t isA、tB、tCThe following rules are satisfied:
tA-tB＝nπ+120,tA-tC＝nπ+240；
the phase display module is used for displaying the phase of the tested line and is connected with the control module in a super-regenerative remote control mode;
the phase display module comprises a phase indicating unit and a communication trigger signal generating unit;
the phase indicating unit indicates the phase in a form of character indication;
or the phase indicating unit indicates the phase in a mode that the indicating lamp distinguishes the indicating phase; for example, the phase indication unit may be composed of three-color Led lamps (yellow, green and red), and if the control module determines that the phase is phase a, the phase a is turned on, and the phase B, C is also turned on;
the communication trigger signal generating unit is used for sending a trigger signal to the control module during phase detection so that the communication module works to send peak time information. The wireless control device can send a trigger signal to the control module during phase detection, so that the communication module works to send peak time information.
The time service module adopts GPS satellite time service. Wherein, table 1 is a GPS module pin function table.
The time service module is a north-sky BS-280 module, the north-sky BS-280 module sends longitude and latitude and time information to the control module through a serial port, and outputs 1ms high level at a pin every second for synchronous triggering. The north-sky BS-280 module does not need programming, can continuously send data through a serial port after being electrified and successfully positioned by a satellite, and the control module only needs to analyze and process the data.
Table 1: GPS module pin function
The communication module adopts the GPRS module, adopts a plurality of according to electronic type phase indicating device, divides into benchmark side and sampling side according to the function, and the benchmark side is used for gathering the peak time t of ABC three-phase of whole electric wire nettingA、tB、 tC，The sampling side is used for collecting the line peak time t of the phase to be measured0，The electronic phase indicating devices at the reference side and the sampling side respectively carry out instant messaging through respective communication modules;
the control module controls the communication module to send short messages according to the peak time of each phase;
the reference side is the outgoing line position of the transformer substation, and in practical application, the reference side can be reasonably arranged at a convenient traffic position according to the characteristics of the terrain;
the sampling side refers to any line tower position needing phase indication, including a general strain tower, a T joint, a pi joint, a phase exchange position and the like;
after the control module measures the peak time of each phase, the control module passesSending time information of short message and peak time t to two places0And tA、tB、tCThe comparison is performed to obtain A, B, C phases of three-phase power.
The GPRS module is a SIM800L module, and the module communicates with the control module through a serial port.
Examples 2,
The method for applying the device to phase indication in embodiment 1 includes setting an absolutely accurate phase reference value, and comparing the phase indication devices of other towers of the power transmission line with a reference side to judge the ABC three phases, and specifically includes:
1) the electronic phase indicating devices are respectively installed at three phase positions of an outgoing line of a transformer substation to carry out multi-person supervision type manual phase checking, so that absolute accuracy of phase indication of a reference position is guaranteed;
2) the checker holds the electronic phase indicating device by hand to check the accurate phase at the tower, for example: the electronic phase indicating device is respectively arranged at the position of a line corner tower, the position of a special tangent tower, the position of a convenient core phase, the position of a phase change, and the T connection and disconnection positions of a line.
As shown in fig. 1, the reference side and the sampling side are independent electronic phase indicating devices, and are interconnected through instant messaging. The reference side comprises a first sampling module, a first time service module and a first communication module which are connected with a first control module, and the sampling side comprises a second sampling module, a second time service module and a second communication module which are connected with a second control module.
The sampling module measures the phase line of the power transmission line in real time, and continuously acquires the current I of the instant operation phasea、Ib、IcOr phase voltage Va、Vb、VcAnd synchronously transmitting the measurement information to the control module.
The control module receives the phase current I of the output signal of the measuring modulea、Ib、IcOr phase voltage Va、Vb、 VcSampling waveforms by internal ADConverting into digital signals; meanwhile, the control module calibrates the internal time t through the timing module, triggers sampling by a synchronous pulse sent by the timing module when receiving a sampling command, and measures the time peak value time t of each phase reaching the peak value1Time of peak t2Time of peak t3(ii) a The control module controls the communication module to send the peak time of each phase through short messages, and A, B, C three phases are judged after analysis and comparison.
The method for judging A, B, C three phases after analysis and comparison comprises the following steps: according to the rule that tA-tB is n pi +120 and tA-tC is n pi +240, in the same power grid with the same clock, the peak time of the B-phase waveform always lags behind the peak time of the A-phase waveform n pi +120, the peak time of the C-phase waveform always lags behind the peak time of the B-phase waveform n pi +120, the sampling module sends the peak time of the waveform at the sampling side to the A-phase at the reference side through sending a short message, and the three phases ABC are judged through mutual comparison and calculation.
Application examples 1,
The phase verification is carried out on a certain 35kV line switching project, the project comprises 5 old lines which are respectively from 5 substations far away from each other, the middle of each line is transformed, more arrangement modes are changed and T connection are carried out, the phase verification work is more complex, and accurate phases can be quickly obtained only by monitoring the phase arrangement of each line by using a phase indication module near the line switching by utilizing the phase verification method.
The electronic phase indicating device is realized by the following processes:
setting an absolute accurate phase reference value, and comparing the phase indication devices of other towers of the power transmission line with the reference value to judge the ABC three phases: and then, the phase indicating devices are arranged at the position of a line corner tower, the position of a special tangent tower, the position of a convenient phase checking position, the position of a phase changing position and the T connection and disconnection positions of the line, and the accurate phase can be checked by checking people holding the phase indicating devices at the tower.
The sampling module measures the phase line of the power transmission line, and continuously acquires the current I of the instant operation phasea、Ib、IcOr phase voltage Va、Vb、VcAnd synchronously transmitting the sampling information to the control module.
The control module receives the phase current I of the output signal of the sampling modulea、Ib、IcOr phase voltage Va、Vb、 VcThe sampled waveform is converted into a digital signal by the internal AD. Meanwhile, the single chip microcomputer calibrates the internal time t through an external time service module, and triggers sampling by synchronous pulses sent by the time service module when receiving a sampling command, and acquires the time peak value time t of each phase reaching the peak value1Time of peak t2Time of peak t3. The peak time of each phase is sent by a singlechip control communication module through short messages, and A, B, C three phases are judged after analysis, analysis and comparison.
The time service module adopts GPS satellite time service (a north-sky BS-280 module can be used), sends longitude and latitude and time information to the control module, outputs 1ms high level at a pin every second, and can be used for synchronous triggering.
The communication module adopts GPRS (available SIM800L module), and communicates with the control module through a serial port, after the peak time of each phase, time information is sent through a short message, and the peak times of two places are compared, so that A, B, C phases of three-phase electricity are obtained.
The phase display module consists of a phase indicating unit and a communication trigger signal generating unit, the phase indicating unit can consist of three-color led lamps (yellow, green and red), if the control module judges that the phase A is the phase A, the phase A is lightened, and the phase B, C is the same; the communication trigger signal generating unit is a wireless control device and can send a trigger signal to the control module during phase detection so that the communication module works to send peak time information.
Application examples 2,
For example, the electronic phase indication method described in application example 1 is different in that the engineering is to T-connect 1 old line, the line has more transposition and arrangement changes, and most of the line is located in a mountain area, so that it is difficult to check the line from base tower to base tower, and it is only necessary to check the line at a place and T-connection place which are convenient to check.
Application examples 3,
The electronic phase indicating method in application example 1 is characterized in that a line is newly built, the line is led out from an existing transformer substation and enters the newly built transformer substation, after power transmission in engineering construction is completed, phase indicating devices are installed at intervals of the outgoing transformer substation, intervals of the incoming transformer substation, strain towers and conductor transposition positions, and the electronic phase indicating method is used for accurately indicating the phase of the newly built all-line.
Application examples 4,
For example, the electronic phase indicating method of application example 1 is different in that, in order to better monitor the phase of the operating line, the power transmission and transformation operation and maintenance staff install phase indicating devices on old lines, important lines, connection point lines and the like, and the electronic phase indicating method of the present invention is used to accurately indicate the phase of the line.
Application examples 5,
The difference of the electronic phase indication method in application example 1 is that the project is a new project for users, and needs to be connected from multiple places of the power grid, in this case, a phase indication device can be installed at the connection place of the user line and the power grid to accurately indicate the phase of the user, and the user line can also be installed and can be operated by the user.
Claims (9)
1. An electronic phase indicating device, comprising: the device comprises a control module, a sampling module, a time service module, a communication module and a phase display module, wherein the sampling module, the time service module, the communication module and the phase display module are connected with the control module;
the sampling module consists of a current or voltage transformer and is responsible for measuring the current and voltage waveforms of the line in real time and transmitting the measured data to the control module in time;
the control module receives the sampling data of the sampling module, converts and amplifies current or voltage, and converts a sampling waveform into a digital signal by an internal AD (analog-to-digital) module;
meanwhile, the control module also performs unified calibration on internal time through the time service module, so that clocks on the sampling side and the reference side are kept consistent and are matched with the clock of the whole power grid system;
the phase display module sends a sampling command to the control module, the time service module sends a synchronous pulse to trigger a sampling signal to trigger sampling, and the control module immediately measures the time peak value time t of each phase reaching the peak valueATime of peak tBTime of peak tC(ii) a A, B, C three phases are judged after analysis and comparison, the ABC three phases based on the whole power grid are fixed and unchanged in the analysis and comparison method, and t isA、tB、tCThe following rules are satisfied:
tA-tB＝nπ+120,tA-tC＝nπ+240；
the phase display module is used for displaying the phase of the tested line and is connected with the control module in a super-regenerative remote control mode;
the phase display module comprises a phase indicating unit and a communication trigger signal generating unit;
the phase indicating unit indicates the phase in a form of character indication;
or the phase indicating unit indicates the phase in a mode that the indicating lamp distinguishes the indicating phase;
the communication trigger signal generating unit is used for sending a trigger signal to the control module during phase detection so that the communication module works to send peak time information.
2. The electronic phase indicating device of claim 1, wherein the time service module uses GPS satellite time service.
3. The electronic phase indicating device of claim 2, wherein the time service module is a north-sky BS-280 module, and the north-sky BS-280 module sends latitude, longitude and time information to the control module through a serial port, and outputs a high level of 1ms per second at a pin for synchronous triggering.
4. The electronic phase indicating device of claim 1, wherein the communication module is a GPRS module, and a plurality of electronic phase indicating devices are adopted, and the electronic phase indicating devices are divided into a reference side and a sampling side according to functions, wherein the reference side is used for collecting peak time t of ABC three phases of the whole power gridA、tB、tC，The sampling side is used for collecting the line peak time t of the phase to be measured0，The electronic phase indicating devices at the reference side and the sampling side respectively carry out instant messaging through respective communication modules;
the control module controls the communication module to send short messages according to the peak time of each phase;
the reference side refers to a substation outgoing line position;
the sampling side refers to any line tower position needing phase indication.
5. The electronic phase indicating device of claim 4, wherein the GPRS module is a SIM800L module, and the module communicates with the control module through a serial port.
6. The method for indicating the phase by using the device according to claim 1 includes setting an absolutely accurate phase reference value, and is characterized in that the phase indicating devices of other towers of the power transmission line judge the ABC three phases by comparing with a reference side, and specifically includes:
1) the electronic phase indicating devices are respectively installed at three phase positions of an outgoing line of a transformer substation to carry out multi-person supervision type manual phase checking, so that absolute accuracy of phase indication of a reference position is guaranteed;
2) and (4) the checker holds the electronic phase indicating device by hand to check the accurate phase at the tower.
7. The method of claim 6The device is applied to a phase indication method, and is characterized in that the sampling module measures a phase line of a power transmission line in real time and continuously acquires an instant operation phase current Ia、Ib、IcOr phase voltage Va、Vb、VcAnd synchronously transmitting the measurement information to the control module.
8. Method for phase indication according to claim 6, wherein the control module receives the phase current I of the output signal of the measuring modulea、Ib、IcOr phase voltage Va、Vb、VcConverting the sampled waveform into a digital signal by the internal AD; meanwhile, the control module calibrates the internal time t through the time service module, triggers sampling by synchronous pulses sent by the time service module when receiving a sampling command, and measures the time peak value time t when each phase reaches the peak value1Time of peak t2Time of peak t3(ii) a The control module controls the communication module to send the peak time of each phase through short messages, and A, B, C three phases are judged after analysis and comparison.
9. The method for phase indication by the device of claim 8, wherein the method for determining A, B, C three phases after analyzing and comparing comprises: according to the rule that tA-tB is n pi +120 and tA-tC is n pi +240, in the same power grid with the same clock, the peak time of the B-phase waveform always lags behind the peak time of the A-phase waveform n pi +120, the peak time of the C-phase waveform always lags behind the peak time of the B-phase waveform n pi +120, the sampling module sends the waveform peak time of the sampling side to the A-phase of the reference side through sending a short message, and the sampling module compares the waveform peak time of the sampling side with the waveform peak time of the A-phase of the reference side and calculates the comparison to judge the ABC.
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