CN107085196A - A kind of calibration method of electronic type AC energy meter - Google Patents
A kind of calibration method of electronic type AC energy meter Download PDFInfo
- Publication number
- CN107085196A CN107085196A CN201710256534.4A CN201710256534A CN107085196A CN 107085196 A CN107085196 A CN 107085196A CN 201710256534 A CN201710256534 A CN 201710256534A CN 107085196 A CN107085196 A CN 107085196A
- Authority
- CN
- China
- Prior art keywords
- energy meter
- electronic type
- mrow
- msub
- calibrating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The present invention relates to a kind of calibration method of electronic type AC energy meter, methods described comprises the following steps：Shunt running calibrating is carried out to electronic type AC energy meter；Starting calibrating is carried out to the electronic type AC energy meter examined and determine by shunt running；To carrying out relative error calibrating by starting the electronic type AC energy meter of calibrating；The electronic type AC energy meter examined and determine relative error in defined threshold carries out error of time of day calibrating.Compared with prior art, the present invention has the advantages that calibrating is comprehensive, flow is convenient and saves the time.
Description
Technical field
The present invention relates to electric energy meter detection field, more particularly, to a kind of calibration method of electronic type AC energy meter.
Background technology
In recent years, with the fast development of science and technology, Electric Energy Metering Technology is advanced by leaps and bounds.2009, national grid was public
The serial company standard of department's issue intelligent electric energy meter, has pulled open the prelude of a wide range of popularization and application of intelligent electric energy meter.From 2010,
District of Shanghai starts to install and use intelligent electric energy meter comprehensively, 7 years has been gone through so far, whole city's scope has been completely covered in intelligent electric energy meter.
The capability and performance of electronic electric energy meter especially intelligent electric energy meter has been greatly promoted, and its actual service life there has also been considerable dash forward
It is broken.State Grid Shanghai Electric Power Company has formulated the technology of standard criterion in processes such as the buying of electric energy meter, experiment, examination, calibratings
It is required that required with management, and strict implement is supervised.In this case, currently the electric energy meter of rotation of expiring is carried out according to the fixed cycle
Traditional operation and management mode is although fairly simple, easily operation, but also show out many disadvantages especially：First, traditional mode has
Body ignores product quality level in implementing, and closes on after rotational cycle and completely imposes uniformity without examining individual cases sink or swim.Existing electric energy calendar life is general
More than 10-15 is generally reached, and rotational cycle is only 6-8, it means that even if reaching after rotational cycle actually still
So have a large amount of intact with electric energy meter capability and performance, change, trigger without exception sink or swim after rotational cycle if electric energy meter is reached
Old table dismounting processing, new table purchase a series of activities such as installation, and largely obviously the intact electric energy meter of quality is scrapped ahead of time, not only
Manpower and materials cost is huge, and is unfavorable for energy-saving, significant wastage social resources.
Therefore, if wanting to save resource, need to judge by sampling Detection Most current electric energy meter quality whether
Still it is intact, thus how the quality of electronic type AC energy meter is examined and determine, then become a urgent problem to be solved.
The content of the invention
The purpose of the present invention is to provide a kind of calibration method of electronic type AC energy meter regarding to the issue above.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of calibration method of electronic type AC energy meter, methods described comprises the following steps：
1) shunt running calibrating is carried out to electronic type AC energy meter；
2) starting calibrating is carried out to the electronic type AC energy meter examined and determine by shunt running；
3) to carrying out relative error calibrating by starting the electronic type AC energy meter of calibrating；
4) the electronic type AC energy meter examined and determine relative error in defined threshold carries out error of time of day calibrating.
The shunt running is examined and determine：Electronic type AC energy meter is accessed in circuit, keeps current circuit to be not added with electric current,
Voltage circuit applies voltage, and it is the 115% of reference voltage value to apply magnitude of voltage, keeps phasor φ to meet φ=1 and export single
The pulse that member is sent is no more than one.
The shortest time Δ t of shunt running calibrating is specially：
For 1 grade of electronic type AC energy meter：
For 2 grades of electronic type AC energy meters：
Wherein, C is the umber of pulse that electronic type AC energy meter output unit is sent, UnFor reference voltage, ImaxFor maximum electricity
Stream, m is electric energy meter coefficient correlation.
The starting test is specially：Keep examining and determine identical voltage and phasor with shunt running, by electronic type AC energy meter
Current circuit be increased to it is artificial as defined in starting current IQAfterwards, in the starting time limit t of electronic type AC energy meterQIt is interior to electric energy
The show value of table is continuously recorded.
The starting time limit tQSpecially：
Wherein, C is the umber of pulse that electronic type AC energy meter output unit is sent, UnFor reference voltage, m is electric energy meter phase
Relation number.
The method of relative error calibrating is specially：By the output pulse of accredited electronic type AC energy meter,
The electronic type AC energy meter of control standard is counted, and is calculated according to count value and is obtained accredited electronic type AC energy meter
Relative error γ.
The relative error γ is specially：
Wherein, m is actual measurement umber of pulse, and N is the umber of pulse of accredited electronic type AC energy meter, C0For standard electric minor
The instrument constant of AC energy meter, CLFor the instrument constant of accredited electronic type AC energy meter, KIAnd KURespectively standard electric
The electric current and voltage transformer no-load voltage ratio of minor AC energy meter.
The error of time of day is examined and determine：Electronic type AC energy meter is accessed in circuit, keeps voltage circuit to apply
Plus reference voltage reaches more than 1h, the rate-adaptive pacemaker of electronic type AC energy meter is tested by standard time clock tester, keeps surveying
The amount time reaches 1min and continuous measurement reaches more than 5 times, records measured value and calculates arithmetic average, obtained result conduct
Error of time of day.
Compared with prior art, the invention has the advantages that：
(1) present invention is examined and determine by carrying out shunt running calibrating to electronic type AC energy meter successively, starting calibrating, relative error
With error of time of day calibrating, completely, the Whole verification to electronic type AC energy meter is comprehensively realized, so as to clearly electricity
Whether the quality of minor AC energy meter meets the requirements, and can then realize the sampling Detection to electronic type AC energy meter, section
Resource-saving and cost.
(2) electronic type AC energy meter examined and determine according to shunt running, start calibrating, relative error calibrating and error of time of day inspection
Fixed order is examined and determine successively, and such verification process can cause the condition of calibrating changes to reach minimum, i.e., suitable according to this
Sequence is examined and determine, and needs the conditional-variable changed smaller every time, therefore verification process can be caused relatively simple, reduces calibrating people
The workload of member.
(3) carry out error of time of day calibrating when, it is necessary to keep voltage circuit apply reference voltage reach more than 1h, due to
During shunt running calibrating, starting calibrating and relative error calibrating, it is required to keep the application reference voltage of voltage circuit, because
This, without waiting excessive duration again, saves the calibrating time when carrying out error of time of day calibrating.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
A kind of calibration method of electronic type AC energy meter proposed by the present invention, comprises the following steps：
1) shunt running calibrating is carried out to electronic type AC energy meter, is specially：
Electronic type AC energy meter is accessed in circuit, keeps current circuit to be not added with electric current, voltage circuit applies voltage, and
Apply that magnitude of voltage is reference voltage value 115%, keeps phasor φ to meet the pulse that φ=1 and output unit sent and is no more than
One, shunt running calibrating shortest time Δ t be specially：
For 1 grade of electronic type AC energy meter：
For 2 grades of electronic type AC energy meters：
Wherein, C is the umber of pulse that electronic type AC energy meter output unit is sent, UnFor reference voltage, ImaxFor maximum electricity
Stream, m is electric energy meter coefficient correlation；
2) starting calibrating is carried out to the electronic type AC energy meter examined and determine by shunt running, is specially：
Keep examining and determine identical voltage and phasor with shunt running, the current circuit of electronic type AC energy meter is increased to artificially
Defined starting current IQAfterwards, in the starting time limit t of electronic type AC energy meterQThe interior show value to electric energy meter is continuously remembered
Record, starting time limit tQSpecially：
Wherein, C is the umber of pulse that electronic type AC energy meter output unit is sent, UnFor reference voltage, m is electric energy meter phase
Relation number；
3) to carrying out relative error calibrating by starting the electronic type AC energy meter of calibrating, it is specially：
By the output pulse of accredited electronic type AC energy meter, the electronic type AC energy meter of control standard is carried out
Count, the relative error γ for obtaining accredited electronic type AC energy meter is calculated according to count value, be specially：
Wherein, m is actual measurement umber of pulse, and N is the umber of pulse of accredited electronic type AC energy meter, C0For standard electric minor
The instrument constant of AC energy meter, CLFor the instrument constant of accredited electronic type AC energy meter, KIAnd KURespectively standard electric
The electric current and voltage transformer no-load voltage ratio of minor AC energy meter；
4) the electronic type AC energy meter examined and determine relative error in defined threshold carries out error of time of day calibrating, specifically
For：Electronic type AC energy meter is accessed in circuit, keeps voltage circuit to apply reference voltage and reaches more than 1h, during by standard
Clock tester tests the rate-adaptive pacemaker of electronic type AC energy meter, keeps time of measuring to reach 1min and continuously measure and reaches 5 times
More than, record measured value and calculate arithmetic average, obtained result is as error of time of day.
Electronic type AC energy meter is specifically examined and determine according to above-mentioned steps, process is as follows：
Firstly for the electric energy meter after use, should be able to the necessary information of accurate discrimination, can accurately read electric energy reading.
The function of instrument should meet the requirements.For watchcase damage, seal destruction, binding post can not again wiring and influence calibrating table, should
Use substitution table.
Then start, false actuation test, during experiment, current circuit is not added with electric current, and voltage circuit applies voltage and should be reference electricity
115%, cos φ=1 of pressure, test output unit sends out pulse and does not answer more than one.
False actuation test minimum test duration △ t see below formula：
1 grade of table：
2 grades of tables：
Wherein：
C --- the umber of pulse that electric energy meter output unit is sent, imp/kWh；
Un--- reference voltage, V；
Imax--- maximum current, A；
M --- coefficient, to single-phase electric energy meter, m=1；To three-phase and four-line electric energy meter, m=3；
After false actuation test terminates, starting test is carried out, in voltage circuit plus reference voltage UnUnder conditions of cos φ=1,
The electric current of current circuit is raised to starting current I as defined in table 3QAfterwards, electric energy meter is in starting time limit tQInterior electric energy meter should be able to be started and connected
Continuous record.Time limit determines as the following formula：
In formula：
IQ--- starting current, A；
After starting test terminates, start fundamental error of measurement, determine by during inspection Basic Error of Energy Meter, in cos φ
Under the conditions of=1, voltage circuit adds reference voltage, and current circuit leads to reference current Ib, 15min is preheated, by load current from ImaxBy
The sequential determination elementary error of secondary reduction.
The bearing power that fundamental error of measurement should be set up, under reference frequency and reference voltage, is used electric energy meter
During middle inspection, generally should under bearing power as defined in Tables 1 and 2 fundamental error of measurement.
Table 1 examines and determine the bearing power that should be set up during the three-phase electric energy meter under single-phase electric energy meter and balanced load
The bearing power that should be set up during the packet calibrating of the three-phase power electric energy meter of table 2
Specific then be that electric energy meter calibration is carried out with comparison method, standard electric energy meter and tested electric energy meter are all continuously working
In the case of, the Pulse Width Control standard electric energy meter exported with tested electric energy meter counts to determine the relative error of tested electric energy meter.
The relative error γ (%) of tested electric energy meter is calculated as follows.
In formula：M --- actual measurement umber of pulse；
m0--- the umber of pulse of fixed (or preset) is calculated, is calculated as follows.
In formula：N --- tested electric energy meter umber of pulse；
C0--- (pulse) instrument constant (imp/kWh) of standard scale；
CL--- the instrument constant (imp/kWh) of tested electric energy meter；
KI、KU--- the external electric current of standard scale, voltage transformer no-load voltage ratio.When no external impressed current, voltage transformer,
KIAnd KUIt is equal to 1.
Properly select the external transformer range of umber of pulse N and standard scale of tested electric energy meter or the multiplying power of standard scale
Shelves are switched, makes to determine (or preset) umber of pulse and actual measurement umber of pulse meets the regulation of table 3, while the test time limit is no less than every time
5s。
Table 3 calculates the decimal digits of fixed (or preset) umber of pulse and the tested electric energy meter error of display
Under each bearing power, error determination data twice is at least recorded, its average value is taken as actual measurement elementary error
Value.Tested electric energy meter umber of pulse such as can not be correctly gathered, casts out the data measured.If the relative error measured be equal to 0.8~
The limit of intrinsic error of 1.2 times of tested electric energy meters, then determined twice, take the mean value calculation of each determination data relative by mistake
Difference.
Finally, electronic type AC energy meter determines error of time of day as defined in relative error being met, and process is pressure-wire
Road (or auxiliary battery line) adds after reference voltage 1h, surveys electric energy meter rate-adaptive pacemaker with standard time clock tester, continuously measures 5
Secondary, each time of measuring is 1min, takes its arithmetic mean of instantaneous value, judges whether result of the test meets requirement.
Claims (8)
1. a kind of calibration method of electronic type AC energy meter, it is characterised in that methods described comprises the following steps：
1) shunt running calibrating is carried out to electronic type AC energy meter；
2) starting calibrating is carried out to the electronic type AC energy meter examined and determine by shunt running；
3) to carrying out relative error calibrating by starting the electronic type AC energy meter of calibrating；
4) the electronic type AC energy meter examined and determine relative error in defined threshold carries out error of time of day calibrating.
2. the calibration method of electronic type AC energy meter according to claim 1, it is characterised in that the shunt running calibrating tool
Body is：Electronic type AC energy meter is accessed in circuit, keeps current circuit to be not added with electric current, voltage circuit applies voltage, and applies
Making alive value is the 115% of reference voltage value, keeps phasor φ to meet the pulse that φ=1 and output unit sent and is no more than one
It is individual.
3. the calibration method of electronic type AC energy meter according to claim 2, it is characterised in that the shunt running calibrating
Shortest time, Δ t was specially：
For 1 grade of electronic type AC energy meter：
<mrow>
<mi>&Delta;</mi>
<mi>t</mi>
<mo>&GreaterEqual;</mo>
<mfrac>
<mrow>
<mn>600</mn>
<mo>&times;</mo>
<msup>
<mn>10</mn>
<mn>6</mn>
</msup>
</mrow>
<mrow>
<msub>
<mi>CmU</mi>
<mi>n</mi>
</msub>
<msub>
<mi>I</mi>
<mi>max</mi>
</msub>
</mrow>
</mfrac>
<mo>&lsqb;</mo>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mo>&rsqb;</mo>
</mrow>
For 2 grades of electronic type AC energy meters：
<mrow>
<mi>&Delta;</mi>
<mi>t</mi>
<mo>&GreaterEqual;</mo>
<mfrac>
<mrow>
<mn>480</mn>
<mo>&times;</mo>
<msup>
<mn>10</mn>
<mn>6</mn>
</msup>
</mrow>
<mrow>
<msub>
<mi>CmU</mi>
<mi>n</mi>
</msub>
<msub>
<mi>I</mi>
<mrow>
<mi>m</mi>
<mi>a</mi>
<mi>x</mi>
</mrow>
</msub>
</mrow>
</mfrac>
<mo>&lsqb;</mo>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mo>&rsqb;</mo>
</mrow>
Wherein, C is the umber of pulse that electronic type AC energy meter output unit is sent, UnFor reference voltage, ImaxFor maximum current, m
For electric energy meter coefficient correlation.
4. the calibration method of electronic type AC energy meter according to claim 1, it is characterised in that the starting test tool
Body is：Keep examining and determine identical voltage and phasor with shunt running, the current circuit of electronic type AC energy meter is increased to artificial rule
Fixed starting current IQAfterwards, in the starting time limit t of electronic type AC energy meterQThe interior show value to electric energy meter is continuously recorded.
5. the calibration method of electronic type AC energy meter according to claim 4, it is characterised in that the starting time limit tQ
Specially：
<mrow>
<msub>
<mi>t</mi>
<mi>Q</mi>
</msub>
<mo>&le;</mo>
<mn>1.2</mn>
<mo>&times;</mo>
<mfrac>
<mrow>
<mn>60</mn>
<mo>&times;</mo>
<mn>1000</mn>
</mrow>
<mrow>
<msub>
<mi>CmU</mi>
<mi>n</mi>
</msub>
<msub>
<mi>I</mi>
<mi>Q</mi>
</msub>
</mrow>
</mfrac>
<mo>&lsqb;</mo>
<mi>m</mi>
<mi>i</mi>
<mi>n</mi>
<mo>&rsqb;</mo>
</mrow>
Wherein, C is the umber of pulse that electronic type AC energy meter output unit is sent, UnFor reference voltage, m is electric energy meter phase relation
Number.
6. the calibration method of electronic type AC energy meter according to claim 1, it is characterised in that the relative error inspection
Fixed method is specially：By the output pulse of accredited electronic type AC energy meter, the electronic type alternating current of standard is controlled
Energy table is counted, and the relative error γ for obtaining accredited electronic type AC energy meter is calculated according to count value.
7. the calibration method of electronic type AC energy meter according to claim 6, it is characterised in that the relative error γ
Specially：
<mrow>
<mi>&gamma;</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>m</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<mi>m</mi>
</mrow>
<mi>m</mi>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
</mrow>
<mrow>
<msub>
<mi>m</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>C</mi>
<mn>0</mn>
</msub>
<mo>&CenterDot;</mo>
<mi>N</mi>
</mrow>
<mrow>
<msub>
<mi>C</mi>
<mi>L</mi>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>K</mi>
<mi>I</mi>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>K</mi>
<mi>U</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein, m is actual measurement umber of pulse, and N is the umber of pulse of accredited electronic type AC energy meter, C0Exchanged for standard electric minor
The instrument constant of electric energy meter, CLFor the instrument constant of accredited electronic type AC energy meter, KIAnd KURespectively standard electric minor
The electric current and voltage transformer no-load voltage ratio of AC energy meter.
8. the calibration method of electronic type AC energy meter according to claim 6, it is characterised in that the error of time of day
Calibrating is specially：Electronic type AC energy meter is accessed in circuit, keeps voltage circuit to apply reference voltage and reaches more than 1h, lead to
The rate-adaptive pacemaker that standard time clock tester tests electronic type AC energy meter is crossed, keeps time of measuring to reach 1min and continuous measurement
Reach more than 5 times, record measured value and calculate arithmetic average, obtained result is as error of time of day.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710256534.4A CN107085196A (en) | 2017-04-19 | 2017-04-19 | A kind of calibration method of electronic type AC energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710256534.4A CN107085196A (en) | 2017-04-19 | 2017-04-19 | A kind of calibration method of electronic type AC energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107085196A true CN107085196A (en) | 2017-08-22 |
Family
ID=59612127
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710256534.4A Pending CN107085196A (en) | 2017-04-19 | 2017-04-19 | A kind of calibration method of electronic type AC energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107085196A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597017A (en) * | 2018-12-26 | 2019-04-09 | 郑州万特电气股份有限公司 | A kind of rapid detection method of intelligent electric energy meter starting and shunt running |
| CN110426669A (en) * | 2019-08-12 | 2019-11-08 | 安徽南瑞中天电力电子有限公司 | A kind of automatic screening methods of electric energy meter based on error testing |
| CN110780139A (en) * | 2019-11-13 | 2020-02-11 | 湖南省计量检测研究院 | Method for measuring working error of electric vehicle charger |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901388A (en) * | 2014-03-26 | 2014-07-02 | 国家电网公司 | Parallel detection terminal device and detection method |
-
2017
- 2017-04-19 CN CN201710256534.4A patent/CN107085196A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901388A (en) * | 2014-03-26 | 2014-07-02 | 国家电网公司 | Parallel detection terminal device and detection method |
Non-Patent Citations (3)
| Title |
|---|
| 何叶萍: ""故障电能表检定与分析"", 《科技信息》 * |
| 唐虹等: "《电子式交流电能表检定规程》", 31 March 2013, 中国质检出版社 * |
| 祝小红等: "《电能计量（第二版）》", 31 August 2014, 中国电力出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109597017A (en) * | 2018-12-26 | 2019-04-09 | 郑州万特电气股份有限公司 | A kind of rapid detection method of intelligent electric energy meter starting and shunt running |
| CN110426669A (en) * | 2019-08-12 | 2019-11-08 | 安徽南瑞中天电力电子有限公司 | A kind of automatic screening methods of electric energy meter based on error testing |
| CN110780139A (en) * | 2019-11-13 | 2020-02-11 | 湖南省计量检测研究院 | Method for measuring working error of electric vehicle charger |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103424732B (en) | A kind of direct-current electric energy meter calibrating device | |
| CN106646267A (en) | Method and device for detecting service life of battery of power distribution terminal | |
| CN101694518B (en) | Direct current energy meter test device, energy error test method and creeping calibration method | |
| CN104808168A (en) | Rapid electric energy meter verification method based on segmented current technology | |
| CN107085196A (en) | A kind of calibration method of electronic type AC energy meter | |
| CN106483397B (en) | A kind of electric energy quality detection device and measurement method of high-precision high bandwidth | |
| TW201523006A (en) | On-line battery internal resistance measuring apparatus and measuring method thereof | |
| CN111025218B (en) | System and method for online real-time self-calibration of clamp-on ammeter | |
| CN104833942B (en) | Electric energy meter battery power consumption automonitor and application method | |
| CN108593989A (en) | 10kV transformer efficiencies and current methods are calculated using ammeter pulse flicker interval | |
| CN103424734A (en) | On-line calibration method of electronic watt-hour meter | |
| CN102736055B (en) | The online test method of the three-phase intelligent ammeter accuracy of measuring | |
| CN105182126A (en) | Improved distribution transformer energy efficiency measuring detection method | |
| CN204575774U (en) | There is the programmable electronic load of direct current resistance measuring ability | |
| CN114200381B (en) | Intelligent ammeter reliability detection system and method | |
| CN103344937B (en) | Intelligent electric energy meter consumption detection equipment and detection method | |
| CN113933580B (en) | System and method for detecting efficiency of direct-current charging pile based on instantaneous active synchronization | |
| CN106990381A (en) | A kind of transformer magnetic saturation detection means | |
| CN206638714U (en) | Situ metrology check device | |
| CN203643592U (en) | Detection device for direct current electric energy meter | |
| CN205920211U (en) | Portable capacitive on -line monitoring sensor tester | |
| CN105223452B (en) | Realize electric energy quality monitoring and the electric energy quality monitor and method of pollution sources positioning | |
| CN205751741U (en) | A kind of Multifunction transformer degaussing gear | |
| CN107632263A (en) | A kind of method and system that remaining battery power is characterized using magnitude of voltage | |
| CN201417260Y (en) | Fractional-octave type insulator equivalent salt deposit density measuring instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170822 |