CN107632282A - The investigating method of three-phase and four-line metering device wiring automatic detection instrument - Google Patents
The investigating method of three-phase and four-line metering device wiring automatic detection instrument Download PDFInfo
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Abstract
The invention discloses the investigating method of three-phase and four-line metering device wiring automatic detection instrument, contrasted using phase voltage, detection electric current is detected with measuring phase voltage, the size of measurement electric current and phase difference, judge whether three-phase and four-line metering device is the wiring error for being unable to correct measurement three phase power, and carry out electricity corrigendum, realize the complicated hidden false wiring of automatic detection, calculate readjustment electric quantity, move back benefit electricity, false alarm is few.
Description
[technical field]
The present invention relates to the investigating method of three-phase and four-line metering device wiring automatic detection instrument.
[background technology]
In three-phase and four-line metering device frequently with by pressure-wire, electric current line directly (through current transformer access electric energy meter,
Or high-voltage large current is converted into low-voltage current signal through two using Y/Y wiring voltage transformer and three current transformers
Minor loop introduces electric energy meter, therefore false wiring often occurs and cause the serious misalignment of electric quantity metering.At present can only to three-phase voltage,
Whether voltage phase sequence, total power factor and electric current are anti-phase, decompression, defluidization etc. are detected, to complicated hidden false wiring very
Difficulty accomplishes accurate automatic detection identification, it is therefore desirable to which measurement verification personnel blindly generally investigate to live, considerably increase electric quantity metering
O＆M and stealing cost is looked into, and after the wiring that makes a mistake, the artificial readjustment electric quantity error that calculates is big, easily controversial, moves back benefit
The electricity charge are difficult.
[content of the invention]
Instant invention overcomes the deficiency of above-mentioned technology, there is provided the survey of three-phase and four-line metering device wiring automatic detection instrument
Prosecutor method, contrasted, sentenced with measuring phase voltage, the size of measurement electric current and phase difference using phase voltage, detection electric current is detected
Whether disconnected three-phase and four-line metering device is the wiring error for being unable to correct measurement three phase power, and carries out electricity corrigendum.
To achieve the above object, present invention employs following technical proposal：
The investigating method of three-phase and four-line metering device wiring automatic detection instrument, its step are as follows：
A, the phase voltage for taking the first element of the basic metering units of three-phase and four-line to measure is set toThe measurement of second element
Phase voltage is set toThe phase voltage of third element measurement is set toFirst element measurement phase current is set toSecond element is surveyed
Amount phase current is set toThird element measurement phase current is set toNormal phase voltage value scope is set as US, actual electric network three-phase
The difference of voltage phase difference and balanced three-phase voltage phase difference isEconomic power angular region isCurrent setting value is IS, inspection
The setting time for surveying voltage and current and phase difference is TS；
B, three-phase phase voltage is worked asIn have a phase voltage value not in normal phase voltage value scope USIt is interior or with
The phase difference of other two-phase phase voltage does not existWhen interior, then by setting range USInterior normal phase voltage is being set
Determine scopeInterior line voltage obtains the phase voltage so that the magnitude of voltage of three-phase phase voltage is in normal phase voltage value scope US
Interior, three-phase voltage phase difference existsThree-phase phase voltage that is interior and being positive phase sequence is simultaneously set to
C, electric current is worked asIt is all higher than normal current setting value IS, and in current detecting time TSIt is interior, three-phase phase
VoltageIn a voltage-phase and electric current In a current phase
Phase difference in economic power angular regionWhen interior, the phase voltage is same phase with the electric current, therefore draws three groups of phase electricity with phase
Pressure and currents combination, it is respectively
D, when three groups drawn are the same as the phase voltage and currents combination of phase With first
Element, the second element, the voltage and current combination of third element measurement Difference, then sentence
Disconnected three-phase and four-line metering device is the false wiring for being unable to correct measurement power；
E, the power of readjustment electric quantity is calculated with currents combination using three groups of phase voltages with phase for judging to drawAnd set readjustment electric quantity and use electricity as user.
Phase voltageVoltage-phase and phase currentThe phase difference of current phase, phase voltageVoltage-phase and phase currentThe phase difference of current phase, or phase voltageVoltage-phase and phase currentThe phase difference of current phase, beyond the warp of setting
Ji power angular regionThe time of operation and the ratio of total run time are more than setting ratio lSWhen, judge three-phase and four-line metering dress
It is set to wiring error.
The setting ratio lSFor 0.1.
The phase voltage setting range USLie prostrate=specified phase voltage × (1 ± 0.1).
The current setting value ISPacify=rated current × 0.05.
The setting time T of the detection voltage and current and phase differenceSFor 5 minutes or 15 minutes.
The economic power angular regionFor -20 °≤38°、-26°≤32°、-29°≤ 29 ° or-
30°≤30°。
The difference of the actual electric network three-phase voltage phase difference and balanced three-phase voltage phase differenceFor 1 °, 2 °, 5 ° or
10°。
The beneficial effects of the invention are as follows：
1st, it is also to lag in advance that need not know user power utilization load split-phase power factor, and three-phase power load electric current is without right
Claim (only to need each phase current size to be more than setting value, in-phase voltage can be respectively in the economic power angle of setting with current and phase difference
Change), you can the complicated hidden false wiring of automatic detection is realized, readjustment electric quantity is calculated, moves back benefit electricity, false alarm is few.
2nd, the situation short to power factor change interval also wrong mis-wired prompting, pointedly can be prevented in emphasis inspection,
Artificial blindly inspection is reduced, greatly reduces metering O＆M cost；
3rd, when being defined as correct wiring, and user power utilization is run in the range of the economic power factor beyond setting and is, can
Prompting user is adjusted to way of economic operation, has both met the social desirability of energy-saving and emission-reduction, has also provided the user reduction electricity charge branch
The information gone out, improve the service level of power supply enterprise.
4th, basic metering units inside electric energy meter need not be changed, realize detection false wiring, readjustment electric quantity is calculated and move back
Electricity is mended, it can prompt to carry out specific aim inspection and prevent after both sides confirm as false wiring, artificial calculate moves back that to mend electricity inaccurate
Problem, it is ensured that for the economic interests of electricity consumption both sides；
If complicated hidden false wiring stealing the 5, be present, the power factor of split-phase can exceed setting range, can be with emphasis
Test prevents, and anti-electricity-theft ability is strong.
[brief description of the drawings]
Fig. 1 is technical solution of the present invention flow chart；
Fig. 2 is technical scheme flow chart of the embodiment of the present invention；
Fig. 3 is three-phase and four-line metering device correct wiring schematic diagram；
Fig. 4 is three-phase and four-line electric quantity metering voltage phasor-diagram；
Fig. 5 is three-phase and four-line electric quantity metering voltage x current phasor diagram.
[embodiment]
More clearly to illustrate the technology of the present invention method and advantage, below in conjunction with drawings and Examples, the present invention is carried out
Further illustrate.It should be appreciated that its specific embodiment is used only for explaining that the present invention is not limited to the present invention.The embodiment
Technical scheme includes：
1st, phase voltage, electric current are detected by the element of three-phase and four-line metering device first, the second element and third element, or separately
If the first element of circuit composition three-phase and four-line submeter device collection three-phase and four-line metering device, the second element and third element
The phase voltage of detection, electric current；
2nd, when three-phase and four-line metering device or three-phase and four-line submeter device are (below with three-phase and four-line submeter device
Exemplified by, and in phase voltage setting range USInterior phase voltage is normal phase voltage, not in setting range USInterior phase voltage is not
Normal phase voltage) there is a phase phase voltage to be less than decompression starting voltage or be not normal phase voltage, then obtained by normal phase voltage
The phase phase voltage so that three-phase phase voltage value is in setting range USInterior, three-phase voltage phase difference is in the range of setting and for just
Phase sequence voltage；When three-phase phase voltage value is all normal phase voltage, it is normal line voltage (note to have a phases line voltage：Normal line voltage
For normal phase voltageTimes), and two phases line voltages are normal phase voltage, then it is a phase phase voltage of common phase is anti-phase, that is,
The scope that will there is phase difference of the phase phase voltage with other two-phase phase voltage not set in three-phase voltage phase differenceIt is interior
Phase voltage it is anti-phase so that three-phase phase voltage value is in setting range USInterior, three-phase voltage phase difference is in the range of setting and is
Positive sequence voltage；When three-phase phase voltage not in phase voltage value in setting range USWhen interior, such as zero phase breaks, by three-phase normal line
Voltage obtains three-phase phase voltage so that the magnitude of voltage of three-phase phase voltage is all to be all that normal phase voltage, three-phase voltage phase difference exist
In the range of setting and it is positive phase sequence；Two-phase phase voltage is exchanged when three-phase voltage is negative phase-sequence turns into positive phase sequence, by above-mentioned inspection
Survey after adjustment finally give the magnitude of voltage of three-phase phase voltage all in range of set value, three-phase voltage phase difference setting scope
Three-phase voltage interior and for positive phase sequence
3rd, three-phase current is worked asBoth greater than current setting value IS, three-phase phase voltage is respectively compared with that may connect
The current and phase difference of line, in setting time TSInterior three-phase phase voltageRespectively withIn an electric current phase difference setting economic power angular regionIt is interior, meet
Voltage, the electric current of this condition are same phases, and three-phase phase voltage shares three groups of voltage, electric currents with phaseWhen three groups drawn are the same as the phase voltage and currents combination of phaseThe voltage and current group measured with the first element, the second element, third element
CloseDifference, then three-phase and four-line metering device is judged for three-phase and four-line can not be computed correctly
The false wiring of power, and three groups of voltage, electric currents with phase for judging to learn with detectionReadjustment electric quantity is calculated, the three-phase and four-line that readjustment electric quantity subtracts false wiring is counted substantially
Unit electricity is measured, benefit electricity must be moved back；
If the 4, three phase power has a phase power angle, beyond setting economic power angular regionTime TIt is superDuring with total operation
Between TAlwaysRatio, l=TIt is super/TAlways× 100% is more than setting ratio lSWhen, possible three-phase and four-line metering device is false wiring, is prompted
Emphasis inspection prevents.
Cleaning Principle explanation：
Be the correct connection diagram of three-phase and four-line metering device referring to Fig. 3, in figure three-phase and four-line electric quantity metering device be by
Current transformer TA1, current transformer TA2, current transformer TA3, the first element of three-phase and four-line metering, the second element, the
Three elements and voltage, electric current wiring composition, A phase voltagesConnectB phase voltagesConnectConnect C phase voltagesConnectThe neutral conductorConnectA phase currents enterConnectA phase currents go outConnectB phase currents enterConnectB phase currents go outConnect
C phase currents enterConnectC phase currents go outConnectWithThe first element is formed,WithThe second element is formed,WithThird element is formed, during correct wiring
If the above-mentioned equation of false wiring is not necessarily equal, the first element, the second element, third element connect voltage or electric current just not
Must be that correct voltage or electric current connect voltage, electric current, it is necessary to detect the first element, the second element, third element, not with correctly
Voltage, electric current are identical during wiring, then are false wiring, when the voltage x current of three element compositions combines three with correct wiring
When voltage x current combination has a difference, then for the false wiring of three phase power can not be computed correctly, and three groups are learnt with detection
In-phase voltage currents combination calculates readjustment electric quantity, and detection and calculating the readjustment electric quantity principle is described as follows：
1st, take the first element of the basic metering units of three-phase and four-line to measure line voltage to be set toSecond element measurement line electricity
Pressure is set toThird element measurement line voltage is set toFirst element measurement phase current is set toThe measurement of second element is mutually electric
Stream is set toThird element measurement phase current is set toIt is to not change the original function of measuring of basic metering units.By public affairs
Know that convention is understood, another phases line voltage can be calculated in three-phase line voltage by two phases line voltages, can be by one in three-phase symmetrical line voltage
Phases line voltage calculates another two phases line voltage, and symmetrical three-phase phase voltage can be calculated by symmetrical three-phase line voltage；
2nd, start voltage (such as 172V) when three-phase phase voltage has a phase phase voltage to be less than decompression, i.e., do not set model in phase voltage
Enclose USIt is interior, and have a phase phase voltage in phase voltage setting range USIt is interior, i.e., in normal phase voltage USIt is interior (in actual electric network, normally
When phase voltage close to specified phase voltage, such as low pressure mains-supplied specified phase voltage be 220V, when normal typically in 220 ± 10V
Change, can be considered normal phase voltage, normal voltage range can rule of thumb be set, and normal voltage is that voltage is being set in this programme
Ding Fannei), because actual electric network three-phase voltage symmetry is very high, thus it is symmetrical to be set to three-phase voltage, referring to Fig. 4, by normal
Positive phase voltage can obtain another two-phase phase voltage so that three-phase line voltage size symmetrically and is simultaneously positive phase sequence all for normal phase voltage；
When a phase phase voltage is anti-phase, then there are two phases line voltage values to be equal to phase voltage value, as A phase phase voltages are anti-phase, referring to Fig. 4
Understand, two phases line voltagesSize is equal to phase voltage, so, will The A phase phase voltages of common phase are anti-phase, and
And the phase difference of anti-phase A phase voltages and other two-phase phase voltage then should not in the range of the setting of three-phase voltage phase difference
Phase phase voltage is anti-phase, can obtain three-phase phase voltage value and all be normal phase voltage, three-phase voltage phase difference in the range of setting and be
Positive phase sequence；
WhenDo not connect to neutralSuch as connect B phase voltagesAt this moment three-phase phase voltage is not normal
Phase voltage, then a phase normal line voltage is taken, such asDivided by30 ° of phase shift of hysteresis can obtain a mutually normal phase voltage, then phase shift
120 ° and 240 ° can obtain another two-phase phase voltage, then it is all normal phase voltage and symmetrical and be positive that can obtain three-phase phase voltage size
Sequence；
Two-phase phase voltage is exchanged when three-phase voltage is negative phase-sequence, positive phase sequence will be turned into after negative-phase sequence negative-phase sequence；
If the 3, customer charge electric current is too small, reactive-load compensation capacitor is grouping switching, then is difficult that accurate compensation is idle,
The economic power angular region that power angle may exceed setting causes to judge by accident, and customer charge electric current exceedes (such as user after setting value
Rated load current 5%), after reactive-load compensation capacitor can be with accurate compensation, the erroneous judgement that reactive-load compensation is inaccurate can be prevented；
If user's high capacity motor starts, or reactive-load compensation capacitor switching etc., the load power angle of user may
In short-term beyond the economic power angular region of setting, the time interval (such as 5 minutes, 15 minutes) of judgement is set, power can be prevented
Economic power angular region of the angle in short-term beyond setting causes to judge by accident；
The separate of every phase electricity need not be known by calculating three-phase and four-line electricity, only needed three groups and be with the voltage of phase, currents combination
Can, thus need to calculate three phase voltages referring to knowable to Fig. 3Respectively with may wiring six electric currentsPhase difference, learn three groups with phase voltage x currents combine.Referring to Fig. 5
Understand,It is the power angle of A phase, B phase, C phase, they are smaller, and power factor is higher, and reactive loss is smaller, and one
As have the larger user of the power consumption of idle examination by power factor controlling more than 0.9, power factor be 0.9 power angle be
25.8 °, if three-phase phase voltage respectively with a current and phase difference within the time of setting always at the economic power angle of setting
In the range of, referring to Fig. 5, ifIn ± 30 ° in scope, then only three groups with the voltage of phase, electric current (such asWithIt is in-phase voltage, electric current) phase difference is in ± 30 ° in scope；If set ± 30 ° asEconomy
Power angular region, without departing from this scope, compared by phase difference, it is easy to find out the three of energy correct measurement three phase power
Group with phase voltage and currents combination, when three elements connect voltage, electric current voltage x current combination with can correct measurement three
When three groups of voltage with phase of phase power is with currents combination difference, then three-phase and four-line metering device false wiring is judged, calculate more
The power of positive electricityAnd set readjustment electric quantity and use electricity as user, (note：Expression takes complex power real part)；
User power factor examination is that advanced, hysteresis capacity of idle power is all calculated as into capacity of idle power examination, due to overcompensation meeting
Increase compensation equipment loss, the reactive-load compensation equipment switching control of general user is advanced, after-power angle be not it is symmetrical, because
And economic power angular region can also be set as -10 ° to+50 °, i.e. power factor advanced 0.98 to power factor hysteresis 0.64,
Referring to Fig. 5, as long as this scope is less than 60 °, it is possible to judge whether voltage, electric current wiring can correct measurement three phase powers；
Because measuring circuit has error, to prevent from judging by accident, economic power angle setting range can be reduced, such as -10 ° to+40 °,
Can rationally it be set in the range of 60 ° according to user's reactive-load compensation equipment and electrical equipment；
Understanding from the above mentioned, the economic power angular region of the setting is related to user's the control of reactive power compensating, if with
Family the control of reactive power compensating is controlled by not defined mode, and the economic power angular region of setting is exceeded when actual load and will be judged by accident,
For anti-electricity-theft and reduction erroneous judgement, the user that idle examination power factor is 0.9, the economic power angular region of setting can be ± 29 °,
False wiring stealing can be prevented well；The user that idle examination power factor is 0.85, the economic power angular region of setting can
For -26 ° to+32 °；The user that idle examination power factor is 0.80, the economic power angular region of setting can be -20 ° to+38 °；
Though two kinds set anti-electricity-theft be not as good as the first afterwards, whether electric current is anti-phase to greatly reduce stealing degree than detecting, and also increases
The difficulty of stealing.
4th, each phase power angle (power factor) of user typically starts in high capacity motor, or reactive-load compensation capacitor switching
When have and exceed economic power angle (power factor) scope in short-term, this time adds up with total run time than very little, if
Beyond 10%, it may be possible to false wiring, answer emphasis inspection to prevent.
5th, the technical program is that energy accurate compensation is idle within most times based on reactive-load compensation equipment so that user
The power angle (power factor) of each phase load is economic power angle (power factor) scope in setting in most times
It is interior, it can however not excluding due to user's reactive-load compensation equipment failure, or artificially cause the power angle (work(of actual power load
Rate factor) beyond setting economic power angle (power factor) scope, cause erroneous judgement and error count readjustment electric quantity.
Thus the automatic detection false wiring result is only as the prompting for carrying out site inspection, so as to reduce blindness people
The cost of work inspection, it is to prevent from manually calculating readjustment electric quantity inaccuracy problem afterwards to count readjustment electric quantity, only to field connection
Check after confirming that false wiring is consistent with automatic detection result, just can confirm that the readjustment electric quantity and move back benefit electricity, if wiring
Correctly, simply the power angle of power load beyond setting economic power angular region, then notifies user to improve reactive-load compensation, makes reality
Power angle in the range of the economic power angle (power factor) of setting, fulfil the social responsibility of energy-saving and emission-reduction, while can reduce
Electric cost expenditure, the readjustment electric quantity and move back mend electricity clear 0.
Because user itself also there are energy-saving and emission-reduction, the interests demand of electric cost expenditure is reduced, as long as according to user's reactive-load compensation
The characteristics of equipment and power load reasonable selection setting economic power angle (power factor) scope, each detection time length and
The initial current of detection, so long as not having ulterior motives, user will not damage reactive compensation controlling device without reason, be grown using electric load
Time beyond setting economic power angle (power factor) scope operation, thus by automatic detection of the present invention investigate after, emphasis
Inspection prevents, and not only can effectively prevent stealing, can also greatly reduce the blindness of hand inspection.
Detection and calculating readjustment electric quantity (or move back and mend electricity) technical scheme provided by the invention can be applied not only to detection three
The line electric quantity metering false wiring instrument of phase four, it may also be used for three-phase and four-line electric energy meter or the end for having three-phase and four-line electric quantity metering function
End and remote detection, equally belong to the protection domain of patent right of the present invention.
Claims (8)
1. the investigating method of three-phase and four-line metering device wiring automatic detection instrument, its step are as follows：
A, the phase voltage for taking the first element of the basic metering units of three-phase and four-line to measure is set toThe phase voltage of second element measurement
It is set toThe phase voltage of third element measurement is set toFirst element measurement phase current is set toThe measurement of second element is mutually electric
Stream is set toThird element measurement phase current is set toNormal phase voltage value scope is set as US, actual electric network three-phase voltage phase
Potential difference and the difference of balanced three-phase voltage phase difference areEconomic power angular region isCurrent setting value is IS, detection electricity
Pressure and the setting time of current and phase difference are TS；
B, three-phase phase voltage is worked asIn have a phase voltage value not in normal phase voltage value scope USIt is interior or with other two
The phase difference of phase phase voltage does not existWhen interior, then by setting range USInterior normal phase voltage or in setting rangeInterior line voltage obtains the phase voltage so that the magnitude of voltage of three-phase phase voltage is in normal phase voltage value scope USIt is interior, three-phase
Voltage phase difference existsThree-phase phase voltage that is interior and being positive phase sequence is simultaneously set to
C, electric current is worked asIt is all higher than normal current setting value IS, and in current detecting time TSIt is interior, three-phase phase voltageIn a voltage-phase and electric current In a current phase phase
Potential difference is in economic power angular regionWhen interior, the phase voltage is same phase with the electric current, thus draw three groups of phase voltages with phase and
Currents combination, it is respectively
D, when three groups drawn are the same as the phase voltage and currents combination of phaseWith first yuan
Part, the second element, the voltage and current combination of third element measurement Difference, then judge three
The line metering device of phase four is the false wiring for being unable to correct measurement power；
E, the power of readjustment electric quantity is calculated with currents combination using three groups of phase voltages with phase for judging to drawAnd set readjustment electric quantity and use electricity as user.
2. the investigating method of three-phase and four-line metering device wiring automatic detection instrument according to claim 1, its feature exist
In：Phase voltageVoltage-phase and phase currentThe phase difference of current phase, phase voltageVoltage-phase and phase currentElectricity
Flow the phase difference of phase, or phase voltageVoltage-phase and phase currentThe phase difference of current phase, beyond the economic work(of setting
Rate angular regionThe time of operation and the ratio of total run time are more than setting ratio lSWhen, judge that three-phase and four-line metering device is
Wiring error.
3. the investigating method of three-phase and four-line metering device wiring automatic detection instrument according to claim 2, its feature exist
In：The setting ratio lSFor 0.1.
4. the investigating method of three-phase and four-line metering device wiring automatic detection instrument according to claim 1, its feature exist
In：The line voltage setting range USLie prostrate=rated voltage × (1 ± 0.1).
5. the investigating method of three-phase and four-line metering device wiring automatic detection instrument according to claim 1, its feature exist
In：The current setting value ISPacify=rated current × 0.05.
6. the investigating method of three-phase and four-line metering device wiring automatic detection instrument according to claim 1, its feature exist
In：Detect the setting time T of voltage and current and phase differenceSFor 5 minutes or 15 minutes.
7. the investigating method of three-phase and four-line metering device wiring automatic detection instrument according to claim 1, its feature exist
In：The economic power angular regionFor Or
8. the investigating method of three-phase and four-line metering device wiring automatic detection instrument according to claim 1, its feature exist
In：The difference of the actual electric network three-phase voltage phase difference and balanced three-phase voltage phase differenceFor 1 °, 2 °, 5 ° or 10 °.
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| CN109142829A (en) * | 2018-08-08 | 2019-01-04 | 国网重庆市电力公司电力科学研究院 | A kind of online discriminating method of three-phase and four-line metering device false wiring and system |
| CN109613386A (en) * | 2019-01-04 | 2019-04-12 | 常熟开关制造有限公司(原常熟开关厂） | The detection method and device of three phase mains inlet wire zero curve misconnection, automatic change-over |
| CN110632389A (en) * | 2019-09-09 | 2019-12-31 | 广东雅达电子股份有限公司 | Automatic correction method for phase between voltage and current of alternating current system |
| CN111257820A (en) * | 2020-02-20 | 2020-06-09 | 国网山西省电力公司 | Three-phase intelligent electric meter wiring remote detection method |
| CN113655430A (en) * | 2021-08-19 | 2021-11-16 | 国网湖北省电力有限公司随州供电公司 | Method for monitoring and automatically judging three-phase three-wire wrong wiring in batch |
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| CN109613386B (en) * | 2019-01-04 | 2020-10-02 | 常熟开关制造有限公司(原常熟开关厂） | Method and device for detecting misconnection of zero lines of three-phase power supply incoming line and automatic change-over switch |
| CN110632389A (en) * | 2019-09-09 | 2019-12-31 | 广东雅达电子股份有限公司 | Automatic correction method for phase between voltage and current of alternating current system |
| CN110632389B (en) * | 2019-09-09 | 2022-04-12 | 广东雅达电子股份有限公司 | Automatic correction method for phase between voltage and current of alternating current system |
| CN111257820A (en) * | 2020-02-20 | 2020-06-09 | 国网山西省电力公司 | Three-phase intelligent electric meter wiring remote detection method |
| CN113655430A (en) * | 2021-08-19 | 2021-11-16 | 国网湖北省电力有限公司随州供电公司 | Method for monitoring and automatically judging three-phase three-wire wrong wiring in batch |
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