CN109270446A - A kind of Auto-Test System and method of A.C. contactor voltage tolerance - Google Patents
A kind of Auto-Test System and method of A.C. contactor voltage tolerance Download PDFInfo
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- CN109270446A CN109270446A CN201811059952.5A CN201811059952A CN109270446A CN 109270446 A CN109270446 A CN 109270446A CN 201811059952 A CN201811059952 A CN 201811059952A CN 109270446 A CN109270446 A CN 109270446A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
The present invention provides the Auto-Test System and method of a kind of A.C. contactor voltage tolerance, its system includes temporarily dropping generator, ACC, load power source, load, electric energy quality monitoring system, computer, temporarily drop generator is connected with ACC, it realizes to power to ACC and constitutes a control loop, load power source is connected with ACC and load, forms the current supply circuit that a load power source is powered to the load by ACC, it is characterised in that, electric energy quality monitoring system is connected with temporary drop generator and ACC, the data of both synchronous acquisitions.It invents the detection that ACC voltage tolerance is realized using electric energy quality monitoring system synchronous acquisition on-off model.The present invention solves the problems, such as monitoring data synchronousness, reduces the workload of tester, realizes to the automatic test of ACC and automatically generating for tolerance report.
Description
Technical field
The present invention relates to a kind of system and methods more particularly to a kind of A.C. contactor that VTC figure is drawn by test ACC
The Auto-Test System and method of voltage tolerance.
Background technique
With the rising of social production capacity, high-end manufacturing specific gravity is continuously increased, and power quality problem is closed by each side
Note.Voltage dip influences maximum power quality problem as occurrence probability highest, can cause huge warp to sensitive industrial user
Ji loss, the extensive concern by academia and industry.
ACC is by the mode that is in daily use of induction-motor load access power supply network, it is also possible to make control shop equipment, electric heater,
The electrical loads such as machine-tool and various kinds electric power unit, ACC can not only be switched on and off circuit, but also have low-voltage release
Protective effect.ACC control capability is big, is suitable for frequent operation and far distance control, is the critical elements in automatic control system
One of.ACC as a kind of in the widely applied low voltage equipment of industry, it is very sensitive to voltage dip, once voltage is temporary
Drop causes ACC irregular operating, will result in huge economic loss.
In order to reduce economic loss, user can take the compensation devices such as configuration DVR.In order to propose suitable electricity in user side
Pressure temporarily drops control measures and selects suitable ACC to provide foundation according to own situation for industrial user, needs the electricity of clear ACC
Press tolerance.For this purpose, domestic and foreign scholars conduct in-depth research the voltage tolerance of ACC.And it is obtained when passing through test
The VTC curve for taking ACC is most direct and simplest mode.
In terms of testing test, British scholar Djokic carries out comprehensive, system test to the voltage tolerance of ACC.
In testing, Djokic is tested 6 ACC, has analysed in depth property of the ACC under voltage dip, short interruptions effect
Can, rectangle temporarily drop, non-rectangle temporary drop and is studied with the response of ACC the effects of two-stage voltage dip, and by centainly
Step-length chooses voltage dip amplitude, temporarily drops the duration, temporarily drops the phase hit that the moment occurs and temporarily drop waveform starting point, point
It is not tested, has obtained a large amount of data, obtained the VTC in the case of various voltage dips, provided for follow-up study
Sample and foundation.
The sea Chinese scholar Xu Yong has carried out deep analysis to the operating principle of ACC, theoretically analyzes temporarily drop starting point
Influence with phase hit to ACC, then also by a large amount of experimental test verification theory analysis, to various types of ACC
It is tested and depicts VTC.
Existing experiment test obtains the method for the VTC of equipment in standard IEEE 1668-2017, which proposes one
The test method of complete sensitive equipment voltage tolerance is covered, is suitable for voltage rating in 1000V equipment below, and ACC
Voltage rating be 220V, therefore the program is also applied for ACC, it is specific as shown in Figure 2.
It temporarily drops generator in the program to power to equipment to be tested, data collection system acquires data, tester's record
Data are simultaneously arranged, and test report is finally obtained.In a standard, for specific experimental test procedures, recommend three kinds of methods:
(1) method from top to down: temporarily the drop duration remains unchanged, and voltage dip amplitude is successively reduced by 5% step-length.
(2) from left to right method: voltage dip amplitude remains unchanged, and temporarily drops the duration and successively increases.
(3) closed method: it is largely similar to method from top to down, but as long as being resistant to one group of voltage dip, just
It will affect next side test, to greatly reduce test job amount.
The voltage tolerance testing process of ACC:
Step 1: experiment test circuit is put up according to testing scheme figure, record ACC, temporarily drops generator, data acquisition system
The parameter information etc. of system (mostly oscillograph)；
Step 2: with the test method (i.e. method, from left to right method, closed method from top to down) selected to ACC into
Row experiment test, by the failure criterion selected, tester thinks to judge on the basis of data collection system acquires signal
ACC action situation.
Step 3: tester records data
Step 4: tester arranges test data
Step 5: according to experiment the data obtained, test report is made, and analyze the voltage tolerance of ACC.
The shortcomings that prior art:
1. not thering is monitoring system to be monitored temporary drop generator in the prior art, due to shadows such as test environment, temperature
It rings, temporarily dropping the voltage dip that generator is set and the temporary drop being actually sent out, there may be certain differences, lead to test result not
Accurately.
2. there are the times not in the prior art not to temporary drop generator and equipment to be tested (ACC is monitored simultaneously)
Synchronous problem.
3. data collection system is mostly to record the voltage waveform of the equipment using oscillograph, need artificially to read data with
Judge that can ACC be resistant to added voltage dip, workload is cumbersome, and test is caused to be made slow progress.
4. the prior art is entirely manual operation, test report is made to the end from the setting of voltage dip, requires to survey
Examination personnel manual operation, workload is cumbersome, inefficiency.
Summary of the invention
It is real from the workload for reducing tester it is an object of the invention to solve monitoring data synchronousness
Now to the automatic test of ACC and automatically generating for tolerance report, propose a kind of voltage tolerance for ACC from
Dynamic test method, wherein temporary drop generator and ACC are monitored simultaneously using electric energy quality monitoring system, number can be automatically stored
According to automatically generate tolerance report.
The present invention adopts the following technical scheme:
The Auto-Test System of A.C. contactor voltage tolerance, including generator temporarily drops, ACC, load power source is born
It carries, electric energy quality monitoring system, computer, temporarily drops generator and be connected with ACC, realize and constitute a control loop to ACC power supply,
Load power source is connected with ACC and load, forms the current supply circuit that a load power source is powered to the load by ACC, electric energy matter
Amount monitoring system is connected with temporary drop generator and ACC, the data of both synchronous acquisitions.
The further technical solution of the present invention is that electric energy quality monitoring system passes through a channel and voltage dip generator
It is connected, one of channel monitoring temporarily drops the temporary drop signal record that generator is occurred and temporarily drops waveform, and calculates temporarily drop feature, temporarily
The characteristic quantities such as range of decrease value and duration.
The further technical solution of the present invention is that another channel of electric energy quality monitoring system is connected with ACC, acquisition
The on-off model of ACC, for judge ACC can withstanding voltage temporarily drop.
The further technical solution of the present invention is that generator and the signal of ACC temporarily drop in power quality monitor collection voltages
It must assure that the consistency of time, and power quality monitor is connected with computer, power quality monitor will collect spy
Sign amount information is uploaded to database in computer.
A kind of automatic test approach of A.C. contactor voltage tolerance, including
Step 1. according to test macro connection circuit carried test circuit, and by ACC, temporarily drop generator, power quality
The essential information of monitoring device records.
Step 2. carries out experiment test to ACC with the test method selected, and electric energy quality monitoring system monitors temporary simultaneously
The voltage dip information of generator and the switching value information of ACC are dropped, whether is become with the switching value information of ACC during voltage dip
0 is breakdown judge foundation, judges automatically ACC action situation.
Test data is automatically stored to computer in step 3..
Step 4. is ordinate by abscissa, temporary decline V of duration T, and the amount of opening the light 0 or 1 is drawn as label, from
It is dynamic to generate test report.
The boundary line in step 5. normal operating zone and irregular operating region is drawn out with multi-color cord, obtained curve
That is the VTC curve of ACC.
It includes: temporary decline, duration T, switching value information 0 or 1 that test data is stored in step 3.
It include the irregular operating region that data point is all that the region of 0 label is ACC in step 4, ACC is not resistant to this area
Voltage dip in domain；Data point is all the normal operating zone that the region of 1 label is ACC, and ACC is resistant to the electricity in this region
Pressure temporarily drops.
Beneficial effects of the present invention:
1. avoiding influence of the error of temporarily drop generator to test result.
Due to the influence of test environment, test temperature etc., electricity that generator is actually sent out and tester's setting temporarily drops
Temporarily drop may be different for pressure, with one channel monitoring voltage dip signal of electric energy quality monitoring system, available actual voltage
Temporarily drop information avoids influence of the error of temporarily drop generator to test result, improves the accuracy of experiment test.
2. realizing the time synchronization of voltage dip signal and ACC working state monitoring
The amount of opening the light of signal and ACC temporarily drops using two channels of electric energy quality monitoring system while monitoring voltage in the present invention,
It is able to solve and is individually asked with time irreversibility of the data acquisition equipments such as oscillograph to ACC monitoring bring action delay error
It is synchronous to realize monitoring time for topic.
3. realizing automatic test, manpower is saved, is simple and efficient
The prior art needs tester to judge that can ACC be resistant to added voltage dip in person, and the present invention is using electricity
Can mass monitoring system monitor ACC switching value information, as long as a simple program judges voltage dip device ACC switching value
Whether 0 is become, so that it may can be simple and efficient by the criterion of this voltage dip as ACC, while eliminate tester and artificially sentencing
Error brought by disconnected.Tester only needs to set voltage dip at temporarily drop generator, and does not have to the work for judging ACC again
State, if be resistant to added voltage dip, realize automatic test, while can significantly reduce the workload of tester.
4. test result is automatically stored, test report is automatically generated, fully achieves automatic processing
Lower all test results are automatically recorded using electric energy quality monitoring system, and test result is automatically stored to number
According in library.Test data is drawn, the boundary line in two pieces of regions is drawn out with multi-color cord, has just obtained the VTC curve of ACC.
Completely without tester to test data processing, automatic storage test result automatically generates test report, fully achieves
Automatic processing；A large amount of manpowers have been saved, have kept entire ACC voltage tolerance test process more efficient.
Detailed description of the invention
Fig. 1 is the VTC test chart of certain sensitive equipment during term is explained；
Fig. 2 is the testing scheme figure in background technique in IEEE 1668-2017；
Fig. 3 is the Auto-Test System structure chart of A.C. contactor voltage tolerance proposed by the present invention；
Fig. 4 is two channel monitoring data-signal figure of electric energy quality monitoring system.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the technical solution below in the present invention carries out clear
Chu is fully described by, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Term is explained:
Voltage dip (voltage dip or voltage sag): voltage effective value reduces in a short time, is by system
Voltage disturbance problem caused by failure, transformer excitation and large-size machine starting etc..There are two types of definition in the world for voltage dip.
IEEE (the Institute of Electrical and Electronics Engineers, International Electrical engineer
Association) it is named with " voltage sag " to voltage dip, is defined as: voltage root-mean-square valve drops to voltage rating suddenly
90%~10%, the duration is in 0.5 cycle~1min short time disturbance phenomenon；And IEC (International
Eletrotechnical Commission, International Electrotechnical Commission) voltage dip is named as " voltage dip ", by it
It is defined as the 90%~1% of voltage rating, it is why variant, it is because IEC is that station considers in user side, and IEEE then stands
System side considers.At home, voltage dip is also referred to as " voltage dip " or " Voltage Drop " etc..National standard GB/T30137-2013
" power quality voltage dip and short interruptions " are by voltage dip is defined as: certain point power-frequency voltage root-mean-square valve is prominent in electric system
It is so reduced to 0.1p.u~0.9p.u, and restores normal phenomenon after of short duration lasting 10ms~1min.
A.C. contactor (ac coil contactor, ACC): current induced magnetic field is flowed through using coil in industrial electro, is made
Contact closure, to reach the electric appliance of control load.Because can quickly cut off exchange and direct current major loop and can be frequently switched on and
The device of high current control (reaching 800A) circuit, so often applying to motor as control object, it is also possible to make control work
The electrical loads such as plant, electric heater, machine-tool and various kinds motor unit, ACC can not only be switched on and off circuit, but also
With low-voltage release guard effect.ACC control capability is big, is suitable for frequent operation and far distance control, is to automatically control system
One of critical elements in system.ACC is the equipment very sensitive to voltage dip.
Sensitive equipment voltage tolerance: when voltage effective value is constant and is equal to sensitive equipment voltage rating, sensitivity is set
It is standby to operate normally.The voltage dip certain to temporary decline, sensitive equipment can be operated normally under the voltage dip how long
Ability be known as sensitive equipment voltage tolerance.It is tested by experiment, the voltage of available temporary decline 0%-85% is temporary
The sensitive equipment voltage tolerance fallen.
Voltage-tolerance curve (voltage tolerance curve, VTC): pass through the voltage of experiment test sensitive equipment
Tolerance, the critical point of the available sensitive equipment of test result whether normal operation are linked up these points available
One curve, the curve become VTC curve.Voltage dip above VTC envelope of curve line will not cause shadow to sensitive equipment
It rings, causes sensitive equipment irregular working.It is as shown in Figure 1 the VTC of certain sensitive equipment.
Temporary drop generator: the characteristics of for voltage dip, short interruptions voltage tolerance test and requirement and specially design
Programmable power supply, the parameters such as settable temporary drop waveform starting point, phase hit, harmonic wave, frequency.
Electric energy quality monitoring system: being to rely on computer technology, database technology, network communication technology, in conjunction with each
Monitoring point is built into a complete electric energy quality monitoring network system, to realize the online prison to every power quality index
It surveys and statisticallys analyze；It simultaneously can also monitoring switch amount information.
As shown in figure 3, the Auto-Test System of A.C. contactor voltage tolerance of the invention, including generation is temporarily dropped
Device, ACC, load power source, load, electric energy quality monitoring system, computer temporarily drop generator and are connected with ACC, realize and supply to ACC
Electricity constitutes a control loop, and load power source is connected with ACC and load, forms a load power source and is supplied by ACC to load
The current supply circuit of electricity, electric energy quality monitoring system are connected with temporary drop generator and ACC, the data of both synchronous acquisitions.
The further technical solution of the present invention is that electric energy quality monitoring system passes through a channel and voltage dip generator
It is connected, one of channel monitoring temporarily drops the temporary drop signal record that generator is occurred and temporarily drops waveform, and calculates temporarily drop feature, temporarily
The characteristic quantities such as range of decrease value and duration.
The further technical solution of the present invention is that another channel of electric energy quality monitoring system is connected with ACC, acquisition
The switching value information of ACC, for judge ACC can withstanding voltage temporarily drop.
The further technical solution of the present invention is that generator and the signal of ACC temporarily drop in power quality monitor collection voltages
It must assure that the consistency of time, and power quality monitor is connected with computer, power quality monitor will collect spy
Sign amount information is uploaded to database in computer.
A kind of automatic test approach of A.C. contactor voltage tolerance, comprising the following steps:
Step 1. according to test macro connection circuit carried test circuit, and by ACC, temporarily drop generator, power quality
The essential information of monitoring device records.
Step 2. carries out experiment test to ACC with the test method selected, and electric energy quality monitoring system monitors temporary simultaneously
The voltage dip information of generator and the switching value information of ACC are dropped, whether is become with the switching value information of ACC during voltage dip
0 is breakdown judge foundation, judges automatically ACC action situation.
Test data is automatically stored to computer in step 3..
Step 4. is ordinate by abscissa, temporary decline V of duration T, and the amount of opening the light 0 or 1 is drawn as label, from
It is dynamic to generate test report.
The boundary line in step 5. normal operating zone and irregular operating region is drawn out with multi-color cord, obtained curve
That is the VTC curve of ACC.
Signified essential information in step 1 as above are as follows:
Test method in step 2 as above are as follows:
Mainly there are method, from left to right method, closed method, progressive test method etc. from top to down, experimenter is according to test
Workload, accuracy etc. voluntarily select a kind of method to test.
1. method from top to down
2. method from left to right
3. closed method
4. progressive test method
Progressive test method is public method.It is one voltage dip amplitude step-length, duration step-length of setting, step
It is long to depend on specific equipment.
ACC can be used: maximum voltage amplitude: 85%, minimum voltage amplitude 0%；Maximum duration 2s, minimum are held
The continuous time: 0.02s；Voltage magnitude step-length 5%, duration step-length 5ms.
Test process: voltage magnitude 0%-85% (is increased) by step-length 5%, when one timing of temporary decline, when temporarily drop continues
Between by step-length from minimum value test to maximum value (i.e. 0.02s-2s) until ACC disconnection, record key testpoint.
It includes: temporary decline, duration T, switching value information 0 or 1 that test data is stored in step 3.
It include the irregular operating region that data point is all that the region of 0 label is ACC in step 4, ACC is not resistant to this area
Voltage dip in domain；Data point is all the normal operating zone that the region of 1 label is ACC, and ACC is resistant to the electricity in this region
Pressure temporarily drops.
Embodiment 1
Temporarily a voltage dip signal occurs for drop generator, powers to ACC, two channel acquisitions of electric energy quality monitoring system
Data.
Electric energy quality monitoring system channel one monitors temporarily drop generator, and the voltage dip monitored (virtual value curve) is as schemed
4 curves 1, t1 moment temporarily drop generator and signal occur, and voltage is rated value, and voltage dip occurs for the t2 moment, voltage magnitude by
1p.u is down to Vp.u, and t3 moment voltage dip terminates, and voltage is restored to rated value.
T2-t3 is exactly voltage dip duration, voltage dip amplitude V (p.u), duration T=t3-t2
The switching value of the monitoring of electric energy quality monitoring system channel two ACC.(0- when temporarily drop generator is not powered to ACC
T1), ACC normally opened contact disconnects, switching value 0.Temporarily drop generator is powered to ACC but is not occurred when voltage dip (t1-t2),
ACC is worked normally, contact closure, switching value 1.During voltage dip, ACC there are three types of state, respectively correspond curve 2,3,
4:
The first situation, ACC are resistant to the voltage dip of amplitude V, duration T, during voltage dip (t2-t3)
ACC still can be worked normally, normally opened contact closure, switching value 1.
Situation in second, ACC is not resistant to the voltage dip of amplitude V, duration T completely, when voltage dip starts
T2 is carved, ACC cannot be worked normally, and normally opened contact disconnects, and switching value becomes 0.
The third situation, ACC can only be resistant to the voltage dip of amplitude V, duration < T, therefore during voltage dip
(t2-t3) switching value before this 1, then become 0.
After voltage dip (after the t3 moment), voltage is restored to rated value, and ACC is worked normally, switching value 1.
To sum up, as shown in figure 4, if during voltage dip (t2-t3), the switch that electrical energy monitoring system channel two monitors
Amount has the case where becoming 0, means that ACC is not resistant to the voltage dip.Electric energy quality monitoring system records the three of the secondary test
It ties up information (temporary decline V, duration T, switching value 0), is automatically stored in the database.
If the switching value of (t2-t3) ACC is 1 always during voltage dip, indicate that ACC is resistant to this voltage dip.Electricity
Energy mass monitoring system records the three-dimensional information (temporary decline V, duration T, switching value 1) of the secondary test, is stored automatically in
In database.
After all tests, electric energy quality monitoring system by the data of all records and duration T be abscissa,
Amplitude V is ordinate, is that label is drawn in figure with the amount of opening the light (0 or 1), automatically generates test report, obtained figure has two pieces
Region, the data point in one piece of region is 0 entirely, i.e. the irregular operating region of ACC, another piece of number of regions strong point is 1 entirely, i.e.,
The normal operation region of ACC.The boundary line in two pieces of regions is drawn with multi-color cord come obtained colour is the VTC of ACC.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (7)
1. the Auto-Test System of A.C. contactor voltage tolerance, including generator temporarily drops, ACC, load power source, load,
Electric energy quality monitoring system, temporarily drop generator be connected with ACC, realize give ACC power supply composition one control loop, load power source and
ACC is connected with load, forms the current supply circuit that a load power source is powered to the load by ACC, which is characterized in that electric energy matter
Amount monitoring system is connected with temporary drop generator and ACC, the data of both synchronous acquisitions.
2. the Auto-Test System of A.C. contactor voltage tolerance according to claim 1, which is characterized in that electric energy
Mass monitoring system is connected by its any one channel with voltage dip generator, and wherein generator institute temporarily drops in this channel monitoring
Waveform temporarily drops in the temporary drop signal record occurred, and calculates temporarily drop feature, the characteristic quantities such as temporary decline and duration.
3. the Auto-Test System of A.C. contactor voltage tolerance according to claim 2, which is characterized in that electric energy
Another channel of mass monitoring system is connected with ACC, acquires the on-off model of ACC, for judging that can ACC withstanding voltage
Temporarily drop.
4. the Auto-Test System of A.C. contactor voltage tolerance according to claim 1 to 3, special
Sign is, the signal that generator and ACC temporarily drop in power quality monitor collection voltages need to must assure that the consistency of time, and
Power quality monitor is connected with computer, and power quality monitor will collect characteristic quantity information and be uploaded to data in computer
Library.
5. a kind of automatic test approach of A.C. contactor voltage tolerance, which is characterized in that including
Step 1. according to test macro connection circuit carried test circuit, and by ACC, temporarily drop generator, electric energy quality monitoring
The essential information of system equipment records；
Step 2. carries out experiment test to ACC with the test method selected, and electric energy quality monitoring system monitors temporarily drop hair simultaneously
The voltage dip information of raw device and the switching value information of ACC are so that whether the switching value information of ACC during voltage dip becomes 0
Breakdown judge foundation judges automatically ACC action situation；
Test data is automatically stored to computer in step 3.；
Step 4. is ordinate by abscissa, temporary decline V of duration T, and the amount of opening the light 0 or 1 is drawn as label, automatic raw
At test report；
The boundary line in step 5. normal operating zone and irregular operating region is drawn out with multi-color cord, and the VTC for obtaining ACC is bent
Line.
6. a kind of automatic test approach of A.C. contactor voltage tolerance according to claim 5, which is characterized in that
It includes: temporary decline, duration T, switching value information 0 or 1 that test data is stored in step 3.
7. a kind of automatic test approach of A.C. contactor voltage tolerance according to claim 5, which is characterized in that
It include the irregular operating region that data point is all that the region of 0 label is ACC in step 4, ACC is not resistant to the electricity in this region
Pressure temporarily drops；Data point is all the normal operating zone that the region of 1 label is ACC, and ACC is resistant to the voltage dip in this region.
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| CN111077420A (en) * | 2019-12-27 | 2020-04-28 | 广东电网有限责任公司电力科学研究院 | System and method for automatically testing voltage sag tolerance capability of sensitive equipment |
| CN113866575A (en) * | 2021-09-28 | 2021-12-31 | 广东电网有限责任公司 | Voltage sag tolerance testing system and method for low-voltage release |
| CN117368787A (en) * | 2023-10-11 | 2024-01-09 | 深圳市首航电子有限公司 | ACC detection method and system without broken line, terminal and storage medium thereof |
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