CN109389184A - Electric line insulation state clustering method and system based on modulation type injection - Google Patents
Electric line insulation state clustering method and system based on modulation type injection Download PDFInfo
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/1227—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 of components, parts or materials
- G01R31/1263—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—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 of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/22—Matching criteria, e.g. proximity measures
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Abstract
The invention discloses a kind of electric line insulation state clustering method and system based on modulation type injection, specific implementation are as follows: instructed according to frequency modulation(PFM) to electrical power trans mission/distribution system to be measured and inject square wave current；The direct-current component value of each route is obtained in examining system using non-contact measurement and always injects D. C. value；Denoising is carried out to the direct-current component value of each route, to weaken and inject the noise signal of square wave current different frequency and same frequency out of phase；According to the data characteristics between the DC current measures of each route after denoising, judge the similitude between each route DC current measures, the route that similitude between All other routes is unsatisfactory for preset requirement is divided into failure classes, the route that similitude between route meets preset requirement is divided into normal class, the state of insulation of each route is assessed with this.It is can solve through the invention based on the contact type measurement in the Traditional DC addition method, reliability and the problem of accuracy.
Description
Technical field
The invention belongs to technical field of electricity, exhausted more particularly, to a kind of electric line based on modulation type injection
Edge state clustering analysis method and system.
Background technique
With the proposition of smart grid and the continuous improvement of electrical equipment the degree of automation, stability to power grid power supply and
Continuity proposes requirements at the higher level.Power cable because it is safe and reliable, hidden durable and due to be conducive to urban beautification in power grid it is wide
General application.After cable puts into operation, aging occurs under the action of the factors such as electricity, heat, chemistry, causes in semiconductor layer fault location
Water tree cable breakdown significant blackouts accident to caused by is in the trend that accelerates, and in the case, research cable insulation is old
Changing detection method is particularly important.
At present the on-line monitoring method of power cable insulation mainly have flip-flop method, DC superposition method, AC superimposition method,
Earth current method, shelf depreciation method and loss factor method etc..Wherein, the application time of DC superposition method in practice is more early, answers
With relatively broad, measuring principle is also relatively simple.Actual measurement circuit as shown in Figure 1, ground connection voltage transformer
Low-voltage dc power supply is added at neutral point, is superimposed the DC voltage with the alternating voltage being applied on tested cable insulation, from
And pass through the faint DC current of cable insulation by low-pass filter circuit measurement, its insulation resistance is found out, thus to judge
The state of its insulation degradation.But DC superposition method exposes a series of disadvantages: 1) only effective to neutral point non-useful earthing electric network；
2) characteristic signal DC current is generally fainter；3) there are biggish stray electrical currents, can cause measurement error；4) process can
Residual voltage can be generated, protective relaying device is caused to malfunction.
The prior art includes the crosslinking polyethylene cable insulation diagnosis circuit based on positive/negative polarity DC superposition method, crucial
It is by the direct current voltage U of positive-negative polarity+And U-(U+=U-) be superimposed upon on tested cable respectively, and master is flowed through in measurement respectively
The DC current I of insulation+And I-, insulation resistance is obtained, to assess the insulation degradation degree of cable.The online sea market electric power of state is public
Department proposes a kind of measurement circuit of simple 35kV cable insulation on-line monitoring of wiring, can effectively reduce contact potential, leakage
The interference of electric current and noise improves diagnostic accuracy.But these methods are generally existing following insufficient: 1) being assessed using specific threshold value
State of insulation belongs to rigid judgement, interferes and reports by mistake vulnerable to external factor；2) traditional technology uses method etc. of averaging,
It is difficult to further weaken error in data processing level, to improve the reliability of status assessment；3) using pure direct current or
The square wave current of fixed frequency is injected, and pure direct current injector influences vulnerable to spatial noise and leads to surveyed DC error mistake
Greatly, and fixed frequency Square wave injection is vulnerable to same frequency influence of noise that sensitivity is caused to decline.
It is broken through it can be seen that the prior art is mainly found in Insulation monitoring mode, often desalinates its data processing method,
And which kind of insulation detecting method and data processing method are used, weaken error simultaneously in measurement end and data processing end, excludes outer
The interference of portion's factor accurately reflects the insulation performance problem of power cable, is a technical problem to be solved urgently.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of transmission & distribution based on modulation type injection
Electric line insulation state clustering method and system, thus solve which kind of insulation detecting method and data processing method used,
Measurement end and data processing end weaken error simultaneously, exclude the interference of external factor, accurately reflect the insulation performance of power cable
Problem.
To achieve the above object, according to one aspect of the present invention, a kind of power transmission and distribution based on modulation type injection are provided
Line insulation state clustering method, comprising:
(1) it is instructed according to frequency modulation(PFM) to electrical power trans mission/distribution system to be measured and injects square wave current, wherein the frequency modulation(PFM) instructs
For controlling the frequency of the square wave current；
(2) direct-current component of each route in the electrical power trans mission/distribution system to be measured is obtained using non-contact measurement mode
Value and always inject D. C. value；
(3) denoising is carried out to the direct-current component value of each route based on total injection D. C. value, to weaken
With the noise signal of injection square wave current different frequency and same frequency out of phase；
(4) according to the data characteristics between the DC current measures of each route after denoising, judge each item
The route that similitude between All other routes is unsatisfactory for preset requirement is divided by the similitude between route DC current measures
The route that similitude between route meets preset requirement is divided into normal class, the insulation of each route is assessed with this by failure classes
State.
Preferably, step (2) includes:
By the DC measurement module on being sleeved on every outlet of the electrical power trans mission/distribution system bus to be measured obtain it is described to
Survey the direct-current component value of each route in electrical power trans mission/distribution system；
Injection DC measurement module by being sleeved on square wave current injection module exit obtains always injecting D. C. value,
Described in square wave current injection module be used for according to frequency modulation(PFM) instruct to electrical power trans mission/distribution system to be measured inject square wave current.
Preferably, step (3) includes:
(3.1) the direct-current component value of each route is multiplied with total injection D. C. value respectively, wherein each route
Direct-current component value includes and injects the noise contribution of square wave current same frequency phase component and injection square wave current not
The noise contribution of same frequency and with injection square wave current same frequency out of phase noise contribution；
(3.2) value after the corresponding multiplication of each route is carried out to the product in a cycle of injection square wave current respectively
Point, to weaken and inject the noise signal of square wave current different frequency and same frequency out of phase.
Preferably, step (4) includes:
(4.1) data set is obtained to the DC current measures stochastical sampling of each route after denoising, it will
Every route in the data set is set to a cluster；
(4.2) between class distance between every two cluster is calculated, the smallest two clusters of between class distance are merged；
(4.3) between class distance between each cluster after merging is calculated, the smallest two clusters of between class distance are closed
And and repeatedly execute between class distance calculate and Cluster merging operation, until meet cluster termination condition, each route is assessed with this
State of insulation.
It is another aspect of this invention to provide that providing a kind of electric line insulation state cluster point based on modulation type injection
Analysis system, comprising: square wave current injection module, the injection DC measurement mould for being sleeved on square wave current injection module exit
Block, the DC measurement module being sleeved in every outlet of electrical power trans mission/distribution system bus to be measured and the square wave current injection module,
The injection DC measurement module and the connected control processing module of each DC measurement module and with the control processing module
Connected data analysis module；
The square wave current injection module, the frequency modulation(PFM) for being sent according to the control processing module are instructed to be measured
Electrical power trans mission/distribution system injects square wave current, wherein the frequency modulation(PFM) instructs the frequency for controlling the square wave current；
The injection DC measurement module, for measuring total injection D. C. value；
The DC measurement module, for measuring the direct-current component of each route in the electrical power trans mission/distribution system to be measured
Value；
The control processing module is also used to the direct-current component value based on total injection D. C. value to each route
Denoising is carried out, to weaken and inject the noise signal of square wave current different frequency and same frequency out of phase；
The data analysis module, between the DC current measures according to each route after denoising
Data characteristics judges the similitude between each route DC current measures, and the similitude between All other routes is unsatisfactory for
The route of preset requirement is divided into failure classes, the route that the similitude between route meets preset requirement is divided into normal class, with this
Assess the state of insulation of each route.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
1, the present invention selects non-contact measurement apparatus to be only sleeved on without accessing filter circuit on cable grounding line
The direct-current component value in each cable can be measured on bus outlet, weaken the interference to cable run, it is easy to operate.
2, on insulation detecting method, what the present invention injected is the adjustable positive and negative square wave current of frequency, utilizes Phase Lock Technique
Collaboration injection and measurement, and modulation type injection mode is injected using multiple frequencies, greatly weakens the interference of noise signal,
Improve measurement sensitivity.
3, in data processing method, the present invention uses big data clustering method, breaches and only acquires the electrical of this route
Information content assesses the limitation of the insulation performance thinking of the route, utilizes the DC current values of a plurality of route DC measurement module
Data characteristics carry out transverse and longitudinal comparison, independent of specific threshold value, weaken interference of the external factor to DC component measured value,
Improve the science and reliability of Condition assessment of insulation.
Detailed description of the invention
Fig. 1 is a kind of Traditional DC addition method schematic diagram provided in an embodiment of the present invention；
Fig. 2 is a kind of electric line state of insulation clustering based on modulation type injection provided in an embodiment of the present invention
The flow chart of method；
Fig. 3 is a kind of system construction drawing provided in an embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The present invention provides it is a kind of based on modulation type injection the clustering method of electric line state of insulation and system,
The contact type measurement that is intended to solve using non-contact measurement apparatus and big data thinking based in the Traditional DC addition method, can
The problem of by property and accuracy.The present invention breaks through the injection mode of the Traditional DC addition method on insulation detecting method, using tune
Property injection mode processed, i.e. square wave current injection module are to the adjustable square wave current of examining system injected frequency；In data processing side
Big data cluster analysis method is used in method, the cluster according to the output of non-contact measurement apparatus, according to multi-line measured value
Analysis carries out transverse and longitudinal comparison, does not depend on specific threshold value, cable run is divided into failure classes and normal class, carry out cable with this
The online evaluation of state of insulation.
Fig. 2 is a kind of electric line state of insulation clustering based on modulation type injection provided in an embodiment of the present invention
The flow chart of method, comprising the following steps:
Step S1: square wave current injection module injects square wave current to examining system using modularity injection mode；
Square wave current injection module is to square wave current known to examining system bus injected frequency, and its frequency is by control
Module is managed to determine.At regular intervals, control processing module can send the instruction for changing frequency, side to square wave current injection module
Wave electric current injection module receives the frequency that instruction changes its Injection Current immediately later.
Step S2: the direct-current component value of each route of DC measurement module non-contact measurement；
DC measurement module is set in the every outlet of examining system bus, meanwhile, square wave current injection module exit
Also suit injection DC measurement module, each DC measurement module measure DC component in each route simultaneously, and by institute's measured data
It is sent to control processing module.Above-mentioned DC measurement module is non-contact measurement, can avoid generating interference to examining system,
Measurement accuracy is improved, and patching operations are simple.
Step S3: the received direct current component value of institute is handled using Phase Lock Technique；
In order to further ensure the accuracy of institute's measured data, processing module is controlled using Phase Lock Technique to the received direct current of institute
Component value is analyzed.Square-wave signal can obtain a series of sinusoidal signals by Fourier decomposition, therefore by taking sinusoidal signal as an example
Phase Lock Technique is illustrated.Assuming that the square wave current of injection are as follows:
IInjection=A0sin(ω0t+α) (1)
And the direct current that DC measurement module measures include with injection square wave current same frequency phase component noise contribution,
The noise contribution of different frequency and the noise contribution of same frequency out of phase, are set to:
I1=B1sin(ω0t+α) (2)
I2=B2sin(ω1t+θ) (3)
I3=B3sin(ω0t+β) (4)
Wherein, I1For the effective component of DC measurement module measurement, and I2、I3For the noise contribution of interference.
When controlling processing module progress information processing, (I1+I2+I3) and IInjectionIt is coupled, the two is multiplied.
Formula (5), formula (6), formula (7) are added, then carry out the integral in a cycle, is obtained:
By formula (8) it is found that being weakened severely with the noise component(s) of Injection Current different frequency, not with Injection Current same frequency
The noise component(s) of same-phase obtains different degrees of weakening, and obtains with the current component of Injection Current same frequency same-phase larger
Reservation.
Meanwhile square wave current injection module is injected using modularity, at regular intervals, the frequency of Injection Current will be sent out
It is raw to change；Therefore, the ω in formula (1)0It will change.The noise component(s) different from Injection Current frequency is weakened severely as a result,.
Modularity injection mode is injected using multiple frequency currents, is accidentally missed caused by weakening because of the injection of single-frequency electric current
Difference improves measurement sensitivity.
The DC component surveyed need to reach microampere order, be highly prone to the influence of noise and occur that drift is excessive, drift is unstable
The problems such as, therefore, information processing is carried out using Phase Lock Technique and modulation type method for implanting and is greatly improved signal-to-noise ratio, guarantees measurement
Sensitivity.
Step S4: data analysis module carries out transverse and longitudinal comparison using hierarchical clustering algorithm, assesses the insulation shape of each route
State；
After receiving direct current component value of the control processing module using Phase Lock Technique treated each cable run, use
Big data thinking takes into account the direct current component value and its historical measurements of each cable each point, carries out transverse and longitudinal comparison, the analysis of multidimensional
Judgement weakens interference of the external factor to DC component measured value independent of specific threshold value, thus it is more scientific, reliably comment
Estimate the state of insulation of each cable run.
Using the clustering algorithm in big data algorithm according to the data characteristics between the DC measurement value of each cable run, judgement
Similitude between each route survey value will be divided into failure classes with the cable run of All other routes similitude difference, and data characteristics phase
As cable run be divided into normal class.
In embodiments of the present invention, the CURE algorithm in hierarchy clustering method is selected, for any one class u, u.means
The central point of class u and the representative point of class u are respectively indicated with u.rep, u.NumMembers indicates the number of data item in class,
U.Member is the data item in class, and indicates the distance of p and q for any two data item p and q, dist (p, q).
Stochastical sampling is carried out in the direct current component value of a period of time each power cable line and obtains data set, in data set
Each cable run data item is set to one kind, calculates the distance between cluster using Euclidean distance algorithm:
Dist (u, v)=mindist (p, q) p ∈ u.rep, q ∈ v.rep (10)
The distance between every two cluster is calculated by formula (9) and formula (10), between class distance is in two classes
The minimum value of distance between representative point, selection is clustered apart from the smallest two, and merges the two clusters；
A cluster is represented with point is represented, therefore to calculate the representative point and central point newly clustered after the completion of merging, meter
Calculation method are as follows:
Class u merge with class v after new class w central point calculation formula are as follows:
If the data item number in class, which is less than, represents points, is directly calculated and represented a little using contraction factor, calculation formula
Are as follows:
W.rep=p+a* (w.means-p) (12)
Otherwise it needs to select representative point, the choosing method represented a little is: first representative point is apart from the cluster
The farthest data point of central point, representative point thereafter are the previous representative points selected of selected distance apart from farthest data point.
The distance between cluster and agglomerative clustering are recalculated later, are clustered termination condition until meeting, can be sentenced accordingly
The state of insulation of disconnected each power cable line out.
In another embodiment of the present invention, line insulation state is assessed according to the following steps:
(1) start, build the Condition assessment of insulation platform of route as shown in Figure 3, platform includes a square wave current note
Enter module 1, a control processing module 2, a data analysis module 3, an injection DC measurement module 4, N number of DC measurement
Module 5, N cable under test 6 and N number of load 7；
(2) control processing module sends frequency instruction to square wave current injection module, and square wave current injection module is according to institute
The frequency of received instruction setting injection square wave；
(3) positive and negative square wave current of the Square wave injection module to examining system bus injection given frequency；
(4) N number of DC measurement module measures the DC component of corresponding line simultaneously, meanwhile, injection DC measurement module is surveyed
The total injection direct current size of amount；Further, the DC information surveyed is sent to control processing module by each DC measurement module；
(5) after receiving DC information, control processing module is injected using Phase Lock Technique collaboration and measurement, weakens and injects
The noise signal of square wave current different frequency and same frequency out of phase improves signal-to-noise ratio；Further, processing module is controlled
Resulting final data will be handled and be sent to data analysis module；
(6) data analysis module carries out grab sample to DC measurement value is received, and initial data set is obtained, by N line
Road is respectively set to one kind, respectively class 1, class 2 ... ..., class N.It is poly- that every two is calculated with distance algorithm formula (9) and formula (10)
The distance between class, the smallest two class of combined distance.The central point of new class is calculated by formula (11) and formula (12) and is represented a little.
Judge whether thus the state of insulation of each cable can be judged if then stopping cluster calculation by meeting cluster termination condition.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (5)
- The state clustering method 1. a kind of electric line based on modulation type injection insulate characterized by comprising(1) it is instructed according to frequency modulation(PFM) to electrical power trans mission/distribution system to be measured and injects square wave current, wherein frequency modulation(PFM) instruction is used for Control the frequency of the square wave current；(2) using non-contact measurement mode obtain in the electrical power trans mission/distribution system to be measured each route direct-current component value and Total injection D. C. value；(3) denoising is carried out to the direct-current component value of each route based on total injection D. C. value, to weaken and infuse Enter the noise signal of square wave current different frequency and same frequency out of phase；(4) according to the data characteristics between the DC current measures of each route after denoising, judge each route The route that similitude between All other routes is unsatisfactory for preset requirement is divided into failure by the similitude between DC current measures The route that similitude between route meets preset requirement is divided into normal class, the state of insulation of each route is assessed with this by class.
- 2. the method according to claim 1, wherein step (2) includes:It is obtained by the DC measurement module on being sleeved on every outlet of the electrical power trans mission/distribution system bus to be measured described to be measured defeated The direct-current component value of each route in distribution system；Injection DC measurement module by being sleeved on square wave current injection module exit obtains always injecting D. C. value, wherein institute It states square wave current injection module and injects square wave current for instructing according to frequency modulation(PFM) to electrical power trans mission/distribution system to be measured.
- 3. method according to claim 1 or 2, which is characterized in that step (3) includes:(3.1) the direct-current component value of each route is multiplied with total injection D. C. value respectively, wherein the direct current of each route Current component value includes and injects the noise contribution of square wave current same frequency phase component and inject square wave current different frequencies The noise contribution of rate and with injection square wave current same frequency out of phase noise contribution；(3.2) value after the corresponding multiplication of each route is carried out to the integral in a cycle of injection square wave current respectively, with Weaken the noise signal with injection square wave current different frequency and same frequency out of phase.
- 4. according to the method described in claim 3, it is characterized in that, step (4) includes:(4.1) data set is obtained to the DC current measures stochastical sampling of each route after denoising, it will be described Every route in data set is set to a cluster；(4.2) between class distance between every two cluster is calculated, the smallest two clusters of between class distance are merged；(4.3) between class distance between each cluster after merging is calculated, the smallest two clusters of between class distance are merged, and Between class distance calculating and Cluster merging operation are executed repeatedly, and the exhausted of each route is assessed with this until meeting cluster termination condition Edge state.
- A kind of state cluster analysis system 5. electric line based on modulation type injection insulate characterized by comprising square wave electricity Stream injection module, is sleeved on transmission & distribution to be measured at the injection DC measurement module for being sleeved on square wave current injection module exit DC measurement module and the square wave current injection module, the injection DC measurement in every outlet of electric system bus Module and the connected control processing module of each DC measurement module and the data being connected with the control processing module analyze mould Block；The square wave current injection module, the frequency modulation(PFM) for being sent according to the control processing module are instructed to transmission & distribution to be measured Electric system injects square wave current, wherein the frequency modulation(PFM) instructs the frequency for controlling the square wave current；The injection DC measurement module, for measuring total injection D. C. value；The DC measurement module, for measuring the direct-current component value of each route in the electrical power trans mission/distribution system to be measured；The control processing module is also used to carry out the direct-current component value of each route based on total injection D. C. value Denoising, to weaken and inject the noise signal of square wave current different frequency and same frequency out of phase；The data analysis module, for the data between the DC current measures according to each route after denoising Feature judges the similitude between each route DC current measures, and the similitude between All other routes is unsatisfactory for presetting It is required that route be divided into failure classes, the route that the similitude between route meets preset requirement is divided into normal class, is assessed with this The state of insulation of each route.
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Cited By (5)
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| CN112710930A (en) * | 2020-12-16 | 2021-04-27 | 华中科技大学 | Online evaluation method for insulation state in capacitor voltage transformer |
| CN113589192A (en) * | 2021-08-02 | 2021-11-02 | 南华大学 | Dual-frequency injection insulation monitoring method, device and system and storage medium |
| CN114520541A (en) * | 2022-01-14 | 2022-05-20 | 珠海多创科技有限公司 | Online monitoring method and monitoring system for power grid system line |
| CN114552584A (en) * | 2022-01-14 | 2022-05-27 | 珠海多创科技有限公司 | Low-voltage power grid distribution area topology identification system and identification method |
| CN114757305A (en) * | 2022-06-13 | 2022-07-15 | 华中科技大学 | Voltage transformer insulation fault identification method and system based on ensemble learning |
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| CN113589192A (en) * | 2021-08-02 | 2021-11-02 | 南华大学 | Dual-frequency injection insulation monitoring method, device and system and storage medium |
| CN113589192B (en) * | 2021-08-02 | 2024-06-04 | 南华大学 | Dual-frequency injection insulation monitoring method, device, system and storage medium |
| CN114520541A (en) * | 2022-01-14 | 2022-05-20 | 珠海多创科技有限公司 | Online monitoring method and monitoring system for power grid system line |
| CN114552584A (en) * | 2022-01-14 | 2022-05-27 | 珠海多创科技有限公司 | Low-voltage power grid distribution area topology identification system and identification method |
| CN114520541B (en) * | 2022-01-14 | 2023-09-22 | 珠海多创科技有限公司 | Online monitoring method and monitoring system for power grid system line |
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