CN108732409A - A kind of harmonic data methods of exhibiting and device - Google Patents
A kind of harmonic data methods of exhibiting and device Download PDFInfo
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- CN108732409A CN108732409A CN201810486492.8A CN201810486492A CN108732409A CN 108732409 A CN108732409 A CN 108732409A CN 201810486492 A CN201810486492 A CN 201810486492A CN 108732409 A CN108732409 A CN 108732409A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/025—General constructional details concerning dedicated user interfaces, e.g. GUI, or dedicated keyboards
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Power Engineering (AREA)
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Abstract
The invention belongs to the technical fields of harmonic management, and in particular to a kind of harmonic data methods of exhibiting and device；The technical issues of solution is：Offer one kind is easy to operate, reads a kind of convenient harmonic data methods of exhibiting and device；The technical solution used for：A kind of harmonic data methods of exhibiting, includes the following steps：Multigroup key-press input instruction data set associated with display program is defined, key-press input instruction includes：Push-button type and touch potential；Key-press input instruction is monitored；Judge push-button type and touch potential；It transfers the corresponding display program of key command and is shown.
Description
Technical field
The invention belongs to the technical fields of harmonic management, and in particular to a kind of harmonic data methods of exhibiting and device.
Background technology
Harmonic wave to the pollution getting worse of power grid, caused by endanger and can not be ignored, be mainly manifested in：
1, the possibility that resonance occurs in power grid is considerably increased, very high overcurrent or overvoltage is caused and causes accident
It is dangerous；
2, increase added losses, reduce the efficiency and utilization rate of equipment and installations of power generation, transmission of electricity and electrical equipment；
3, increase electrical equipment (electric rotating machine, capacitor, transformer etc.) loss, accelerate insulation ag(e)ing, so as to shorten
Service life；
4, make relay protection, automatic device, computer system and the operating of many electrical equipments abnormal；
5, make measurement and metrical instrument, instrument (such as：Electric energy meter) correctly it cannot indicate or measure；
6, communication system is interfered, the transmission quality of signal is reduced, destroys the normal transmission of signal, or even damage communication is set
It is standby.
Conventional harmonic data processing, observation, displaying method be to show the content or amplitude of harmonic wave successively；It is humorous from 1 time
Wave is to 21 subharmonic；51 subharmonic or 63 subharmonic；Be limited to the size of screen generally by multiple page turning just it is observed that after
The content and amplitude of the overtone order in face；Troublesome in poeration in this way and easy erroneous judgement, fails to judge.It is insufficient below generally existing：
1, cumbersome, generally will multiple page turning from the beginning to the end, effective result cannot disposably be shown in first interface,
It can not intuitively draw a conclusion quickly；And the switching of each item data is inconvenient, data are unable to centralized displaying；It is not easy to observe, obtain
Required result speed is slow.
2, it is easy to miss a certain exceeded data；And since surrounding time difference causes to judge by accident, can not observe in real time all
The number of the larger harmonic wave of content.
3, amplitude and the data of percentage have certain necessity in different occasions, need secondary calculating.
Above-mentioned these drawbacks enumerated observe the harmonic wave generally existing of existing harmonic measure instrument at us.
Invention content
The present invention overcomes the shortcomings of the prior art, technical problem to be solved to be：A kind of easy to operate, reading is provided
Take a kind of convenient harmonic data methods of exhibiting and device.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：
A kind of harmonic data methods of exhibiting, includes the following steps：
Multigroup key-press input instruction data set associated with display program is defined, key-press input instruction includes：
Push-button type and touch potential；Key-press input instruction is monitored；Judge push-button type and touch potential；Transfer key command
Corresponding display program is simultaneously shown.
Preferably, the push-button type includes：F1 buttons, F2 buttons, F3 buttons, F4 buttons；The display program includes：
Show harmonic data, display harmonic content or harmonic amplitude, display three-phase data, display three-phase voltage current harmonic wave sequence number
According to.
Preferably, the corresponding display harmonic data of the touch potential, specifically includes：Acquiescence shows 2 to K subharmonic；It presses
Once the primary display content of switching, the harmonic data for switching display are key：Button n times, display N (K | 1)+2 | (N+1) (K | 1)+
1, wherein：7 >=N >=2, K > 2, and (N+1) (K | 1)+1 | 63.
Preferably, the corresponding display three-phase data of the touch potential, specifically includes：Acquiescence shows whole ABC three-phases
Voltage and current data；
Once the primary display content of switching, each phase data for switching display are followed successively by button：
Show amplitude, humorous phase, active power, the reactive power of A phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of B phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of C phase voltage electric currents.
Preferably, the corresponding display three-phase voltage current harmonic wave sorting data of the touch potential, specifically includes：Acquiescence is aobvious
Show three-phase voltage current harmonic wave sorting data；
Once the primary display content of switching, every voltage and current harmonic wave sorting data of display are followed successively by button：
Show the maximum M subharmonic of A phase voltages；
Show the maximum M subharmonic of A phase currents；
Show the maximum M subharmonic of B phase voltages；
Show the maximum M subharmonic of B phase currents；
Show the maximum M subharmonic of C phase voltages；
Show the maximum M subharmonic of C phase currents；
M value ranges are：10≥M≥2.
Correspondingly, a kind of harmonic data shows device, including：Definition unit, for define the instruction of multigroup key-press input with
Show that the associated data set of program, key-press input instruction include：Push-button type and touch potential；Monitoring unit is used
It is monitored in key-press input instruction；Judging unit, for judging push-button type and touch potential；Display unit is transferred, is used
In transferring the corresponding display program of key command and shown.
Preferably, in the definition unit, the push-button type includes：F1 buttons, F2 buttons, F3 buttons, F4 buttons；
The display program includes：Harmonic data display unit, for showing harmonic data；Harmonic content display unit, for showing
Show harmonic content or harmonic amplitude；Three-phase data display unit, for showing three-phase data；Harmonic wave sorting data display unit,
For showing three-phase voltage current harmonic wave sorting data；Main interface display unit.
Preferably, in the harmonic data display unit, the corresponding display harmonic data of the touch potential is specific to wrap
It includes：Acquiescence shows 2 to K subharmonic；Once the primary display content of switching, the harmonic data for switching display are button：Button n times,
Display N (K | 1)+2 | (N+1) (K | 1)+1, wherein：7 >=N >=2, K > 2, (N+1) (K | 1).
Preferably, in the three-phase data display unit, the corresponding display three-phase data of the touch potential is specific to wrap
It includes：Acquiescence shows the voltage and current data of whole ABC three-phases；
Once the primary display content of switching, each phase data for switching display are followed successively by button：
Show amplitude, humorous phase, active power, the reactive power of A phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of B phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of C phase voltage electric currents.
Preferably, in the harmonic wave sorting data display unit, the corresponding display three-phase voltage current of the touch potential
Harmonic wave sorting data, specifically includes：Acquiescence shows three-phase voltage current harmonic wave sorting data；
Once the primary display content of switching, every voltage and current harmonic wave sorting data of display are followed successively by button：
Show the maximum M subharmonic of A phase voltages；
Show the maximum M subharmonic of A phase currents；
Show the maximum M subharmonic of B phase voltages；
Show the maximum M subharmonic of B phase currents；
Show the maximum M subharmonic of C phase voltages；
Show the maximum M subharmonic of C phase currents；
M value ranges are：10≥M≥2.
The present invention has the advantages that compared with prior art：
The present invention is by defining multigroup key-press input instruction data set associated with display program so that when in use,
Pass through push-button type and touch potential, you can the faster harmonic products for indicating a need for display, operating aspect, data are read
It takes conveniently.
Description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings；
Fig. 1 is a kind of flow diagram for harmonic data methods of exhibiting that the embodiment of the present invention one provides；
Fig. 2 is the structural schematic diagram that a kind of harmonic data that the embodiment of the present invention one provides shows device；
Fig. 3 is the structural schematic diagram that a kind of harmonic data provided by Embodiment 2 of the present invention shows device；
Fig. 4 is the flow diagram that a kind of harmonic data that the embodiment of the present invention three provides shows device；
Fig. 5 is the display schematic diagram that a kind of harmonic data that the embodiment of the present invention three provides shows device；
In figure：10 be definition unit, and 20 be monitoring unit, and 30 be judging unit, and 40 is transfer display unit, and 101 be humorous
Wave data display unit, 102 be harmonic content display unit, and 103 be three-phase data display unit, and 104 be harmonic wave sorting data
Display unit.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments；Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without creative efforts, shall fall within the protection scope of the present invention.
Fig. 1 is a kind of flow diagram for harmonic data methods of exhibiting that the embodiment of the present invention one provides, as shown in Figure 1,
A kind of harmonic data methods of exhibiting, includes the following steps：
Multigroup key-press input instruction data set associated with display program is defined, key-press input instruction includes：
Push-button type and touch potential；
Key-press input instruction is monitored；
Judge push-button type and touch potential；
It transfers the corresponding display program of key command and is shown.
The present invention is by defining multigroup key-press input instruction data set associated with display program so that when in use,
Pass through push-button type and touch potential, you can the faster harmonic products for indicating a need for display, operating aspect, data are read
It takes conveniently.
Specifically, the push-button type includes：F1 buttons, F2 buttons, F3 buttons, F4 buttons；The display program includes：
Show harmonic data, display harmonic content or harmonic amplitude, display three-phase data, display three-phase voltage current harmonic wave sorting data
And interface of main menu.
Further, the corresponding display harmonic data of the touch potential, specifically includes：Acquiescence shows 2 to K subharmonic；
Once the primary display content of switching, the harmonic data for switching display are button：Button n times, display N (K | 1)+2 | (N+1) (K | 1)
+ 1, wherein：7 >=N >=2, K > 2, (N+1) (K | 1)；In the present embodiment, the N is preferably 7, and the K is preferably 10.
Further, the corresponding display three-phase data of the touch potential, specifically includes：Acquiescence shows whole ABC three-phases
Voltage and current data；
Once the primary display content of switching, each phase data for switching display are followed successively by button：
Show amplitude, humorous phase, active power, the reactive power of A phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of B phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of C phase voltage electric currents；
Show the voltage and current data of whole ABC three-phases.
Further, the corresponding display three-phase voltage current harmonic wave sorting data of the touch potential, specifically includes：Acquiescence
Show three-phase voltage current harmonic wave sorting data；Once switching once shows content, every voltage and current harmonic wave of display to button
Sorting data is followed successively by：
Show the maximum M subharmonic of A phase voltages；
Show the maximum M subharmonic of A phase currents；
Show the maximum M subharmonic of B phase voltages；
Show the maximum M subharmonic of B phase currents；
Show the maximum M subharmonic of C phase voltages；
Show the maximum M subharmonic of C phase currents；
M value ranges are：10≥M≥2；In the present embodiment, the M is preferably 9.
Fig. 2 is the structural schematic diagram that a kind of harmonic data that the embodiment of the present invention one provides shows device；A kind of harmonic number
According to displaying device, including：
Definition unit 10, for defining multigroup key-press input instruction data set associated with display program, described presses
Key input instructs：Push-button type and touch potential；
Monitoring unit 20, for monitoring key-press input instruction；
Judging unit 30, for judging push-button type and touch potential；
Display unit 40 is transferred, for transferring the corresponding display program of key command and being shown.
Fig. 3 is the structural schematic diagram that a kind of harmonic data provided by Embodiment 2 of the present invention shows device, as shown in figure 3,
On the basis of embodiment one, in the definition unit 10, the push-button type includes：F1 buttons, F2 buttons, F3 buttons,
F4 buttons；
The display program includes：
Harmonic data display unit 101, for showing harmonic data；
Harmonic content display unit 102, for showing harmonic content or harmonic amplitude；
Three-phase data display unit 103, for showing three-phase data；
Harmonic wave sorting data display unit 104, for showing three-phase voltage current harmonic wave sorting data.
Specifically, in the harmonic data display unit 101, the corresponding display harmonic data of the touch potential, tool
Body includes：
Acquiescence shows 2 to K subharmonic；
Once the primary display content of switching, the harmonic data for switching display are button：Button n times, and display N (K | 1)+2 | (N
+ 1) (K | 1)+1, wherein：7 >=N >=2, K > 2, (N+1) (K | 1).
Specifically, in the three-phase data display unit 103, the corresponding display three-phase data of the touch potential, tool
Body includes：Acquiescence shows the voltage and current data of whole ABC three-phases；
Once the primary display content of switching, each phase data for switching display are followed successively by button：
Show amplitude, humorous phase, active power, the reactive power of A phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of B phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of C phase voltage electric currents.
Further, in the harmonic wave sorting data display unit 104, the corresponding display three-phase voltage of the touch potential
Current harmonics sorting data, specifically includes：Acquiescence shows three-phase voltage current harmonic wave sorting data；
Once the primary display content of switching, every voltage and current harmonic wave sorting data of display are followed successively by button：
Show the maximum M subharmonic of A phase voltages；
Show the maximum M subharmonic of A phase currents；
Show the maximum M subharmonic of B phase voltages；
Show the maximum M subharmonic of B phase currents；
Show the maximum M subharmonic of C phase voltages；
Show the maximum M subharmonic of C phase currents；
M value ranges are：10≥M≥2.
Fig. 4 is the flow diagram that a kind of harmonic data that the embodiment of the present invention three provides shows device；In embodiment two
On the basis of, the N is preferably 7, and the K is preferably 10.
The present embodiment is may also include in three：F5 buttons, for showing interface of main menu；Specifically：
Into after interface, press【F1】Key acquiescence show three-phase voltage, electric current 2-10 subharmonic content.
It presses again【F1】After key page turning, 11-19 each harmonic is shown.Again by can show 20-29 times, and so on, cycle
Back and forth；
It presses【F2】Key harmonic content, which can switch to harmonic amplitude or harmonic amplitude, can switch to harmonic content；
It presses【F3】Key shows amplitude, humorous phase, active power, the reactive power of A phase voltage electric currents, then presses【F3】Key shows B
The amplitude of phase voltage electric current, humorous phase, active power, reactive power, then press【F3】Key show the amplitudes of C phase voltage electric currents, humorous phase,
Active power, reactive power, then press【F3】Key shows the voltage and current of whole ABC three-phases.
It presses【F4】Key display order, is defaulted as regular turn.By primary【F4】Key, which can switch, is shown as " UA TOP9 " display
Maximum 9 subharmonic of A phase voltages；It presses again primary【F4】Key switching is shown as " IA TOP9 ", then by primary【F4】Key switching display
For " UB TOP9 " " IB TOP9 "；It presses again primary【F4】Key switching is shown as " UC TOP9 " " IC TOP9 ", cycle
Back and forth.
Fig. 5 is the display schematic diagram that a kind of harmonic data that the embodiment of the present invention three provides shows device；In the present embodiment,
The whole screen of the present invention shows practical harmonic data, is interfered without others extraneous data；Can be quickly find oneself institute
The harmonic data of care；Oneself some portion of harmonic data of concern can be easily selected to be directly viewable；It will not be because of mistake
Certain mutually larger data is lost to cause to fail to judge, judge by accident, have the advantages that it is succinct, efficient, intuitive and accurate, it is highly practical.
Meanwhile transferring in display unit 40 in the present invention, out of phase data can be indicated with multiple color, be had
There is big font display function, the user of dysphotia is facilitated to check；So that the distance and angle etc. checked have abundant selection.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of harmonic data methods of exhibiting, it is characterised in that：Include the following steps：
Multigroup key-press input instruction data set associated with display program is defined, key-press input instruction includes：Button
Type and touch potential；
Key-press input instruction is monitored；
Judge push-button type and touch potential；
It transfers the corresponding display program of key command and is shown.
2. a kind of harmonic data methods of exhibiting according to claim 1, it is characterised in that：The push-button type includes：F1
Button, F2 buttons, F3 buttons and F4 buttons；
The display program includes：
Show harmonic data, display harmonic content or harmonic amplitude, display three-phase data, display three-phase voltage current harmonic wave sequence
Data.
3. a kind of harmonic data methods of exhibiting according to claim 2, it is characterised in that：The touch potential is corresponding aobvious
Show harmonic data, specifically includes：
Acquiescence shows 2 to K subharmonic；
Once the primary display content of switching, the harmonic data for switching display are button：
Button n times, display N (K | 1)+2 | (N+1 (K | 1)+1, wherein：7 >=N >=2, K > 2, (N+1) K | 1)+1 | 63.
4. a kind of harmonic data methods of exhibiting according to claim 2, it is characterised in that：The touch potential is corresponding aobvious
Show three-phase data, specifically includes：
Acquiescence shows the voltage and current data of whole ABC three-phases；
Once the primary display content of switching, each phase data for switching display are followed successively by button：
Show amplitude, humorous phase, active power, the reactive power of A phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of B phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of C phase voltage electric currents.
5. a kind of harmonic data methods of exhibiting according to claim 2, it is characterised in that：The touch potential is corresponding aobvious
Show three-phase voltage current harmonic wave sorting data, specifically includes：
Acquiescence shows three-phase voltage current harmonic wave sorting data；
Once the primary display content of switching, every voltage and current harmonic wave sorting data of display are followed successively by button：
Show the maximum M subharmonic of A phase voltages；
Show the maximum M subharmonic of A phase currents；
Show the maximum M subharmonic of B phase voltages；
Show the maximum M subharmonic of B phase currents；
Show the maximum M subharmonic of C phase voltages；
Show the maximum M subharmonic of C phase currents；
M value ranges are：10≥M≥2.
6. a kind of harmonic data shows device, it is characterised in that：Including：
Definition unit (10), for defining multigroup key-press input instruction data set associated with display program, the button
Input instructs：Push-button type and touch potential；
Monitoring unit (20), for monitoring key-press input instruction；
Judging unit (30), for judging push-button type and touch potential；
Display unit (40) is transferred, for transferring the corresponding display program of key command and being shown.
7. a kind of harmonic data according to claim 6 shows device, it is characterised in that：In the definition unit (10),
The push-button type includes：F1 buttons, F2 buttons, F3 buttons and F4 buttons；
The display program includes：
Harmonic data display unit (101), for showing harmonic data；
Harmonic content display unit (102), for showing harmonic content or harmonic amplitude；
Three-phase data display unit (103), for showing three-phase data；
Harmonic wave sorting data display unit (104), for showing three-phase voltage current harmonic wave sorting data.
8. a kind of harmonic data according to claim 7 shows device, it is characterised in that：The harmonic data display unit
(101) in, the corresponding display harmonic data of the touch potential specifically includes：
Acquiescence shows 2 to K subharmonic；
Once the primary display content of switching, the harmonic data for switching display are button：
Button n times, display N (K | 1)+2 | (N+1 (K | 1)+1, wherein：7 >=N >=2, K > 2, (N+1) (K | 1).
9. a kind of harmonic data according to claim 7 shows device, it is characterised in that：The three-phase data display unit
(103) in, the corresponding display three-phase data of the touch potential specifically includes：
Acquiescence shows the voltage and current data of whole ABC three-phases；
Once the primary display content of switching, each phase data for switching display are followed successively by button：
Show amplitude, humorous phase, active power, the reactive power of A phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of B phase voltage electric currents；
Show amplitude, humorous phase, active power, the reactive power of C phase voltage electric currents.
10. a kind of harmonic data according to claim 7 shows device, it is characterised in that：The harmonic wave sorting data is aobvious
Show in unit (104), the corresponding display three-phase voltage current harmonic wave sorting data of the touch potential specifically includes：
Acquiescence shows three-phase voltage current harmonic wave sorting data；
Once the primary display content of switching, every voltage and current harmonic wave sorting data of display are followed successively by button：
Show the maximum M subharmonic of A phase voltages；
Show the maximum M subharmonic of A phase currents；
Show the maximum M subharmonic of B phase voltages；
Show the maximum M subharmonic of B phase currents；
Show the maximum M subharmonic of C phase voltages；
Show the maximum M subharmonic of C phase currents；
M value ranges are：10≥M≥2.
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| CN201810486492.8A CN108732409A (en) | 2018-05-21 | 2018-05-21 | A kind of harmonic data methods of exhibiting and device |
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Citations (7)
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|---|---|---|---|---|
| CN86102015A (en) * | 1986-03-28 | 1987-10-14 | 华北电力学院 | Analytical instrument of double triphase real-time electric power harmonic wave |
| CN1046982A (en) * | 1989-05-30 | 1990-11-14 | 山东省煤炭科学研究所 | Power system harmonizing wave measuring method and measuring instrument |
| JPH0843460A (en) * | 1994-07-29 | 1996-02-16 | Toenec Corp | High-harmonic measurement analysis system |
| CN1245897A (en) * | 1998-08-26 | 2000-03-01 | 贺守正 | Harmonic quantitative measurement method of power system and its measurement instrument |
| CN101620248A (en) * | 2009-08-07 | 2010-01-06 | 四川电力试验研究院 | Intelligent ultraharmonic test device |
| CN101639494A (en) * | 2008-07-29 | 2010-02-03 | 三菱电机株式会社 | Electronic indicator |
| CN202057725U (en) * | 2011-05-19 | 2011-11-30 | 利尔达科技有限公司 | A three-phase harmonic electric energy meter |
-
2018
- 2018-05-21 CN CN201810486492.8A patent/CN108732409A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86102015A (en) * | 1986-03-28 | 1987-10-14 | 华北电力学院 | Analytical instrument of double triphase real-time electric power harmonic wave |
| CN1046982A (en) * | 1989-05-30 | 1990-11-14 | 山东省煤炭科学研究所 | Power system harmonizing wave measuring method and measuring instrument |
| JPH0843460A (en) * | 1994-07-29 | 1996-02-16 | Toenec Corp | High-harmonic measurement analysis system |
| CN1245897A (en) * | 1998-08-26 | 2000-03-01 | 贺守正 | Harmonic quantitative measurement method of power system and its measurement instrument |
| CN101639494A (en) * | 2008-07-29 | 2010-02-03 | 三菱电机株式会社 | Electronic indicator |
| CN101620248A (en) * | 2009-08-07 | 2010-01-06 | 四川电力试验研究院 | Intelligent ultraharmonic test device |
| CN202057725U (en) * | 2011-05-19 | 2011-11-30 | 利尔达科技有限公司 | A three-phase harmonic electric energy meter |
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