CN204855780U - A 0. 02 grade of standard table for inserting system stability is experimental for examination of formula three -phase table - Google Patents
A 0. 02 grade of standard table for inserting system stability is experimental for examination of formula three -phase table Download PDFInfo
- Publication number
- CN204855780U CN204855780U CN201520429250.7U CN201520429250U CN204855780U CN 204855780 U CN204855780 U CN 204855780U CN 201520429250 U CN201520429250 U CN 201520429250U CN 204855780 U CN204855780 U CN 204855780U
- Authority
- CN
- China
- Prior art keywords
- dsp
- copper
- electric energy
- output terminal
- converter
- 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.)
- Active
Links
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910052802 copper Inorganic materials 0.000 claims abstract description 65
- 239000010949 copper Substances 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000012795 verification Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 238000013112 stability test Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 10
- 238000009434 installation Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 6
- 230000027455 binding Effects 0.000 description 4
- 238000009739 binding Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The utility model relates to a 0.02 grade of standard table for inserting system stability is experimental for examination of formula three -phase table, including voltage acquisition device, current collection device, AD converter, DSP and pulse interface, voltage acquisition device passes through the voltage output that calibrating installation is connected to copper styletable, and voltage acquisition device is connected to DSP's input, current collection device passes through the current output that calibrating installation is connected to copper styletable, and current collection device connects the input of AD converter, and the output of AD converter is connected to DSP's input, DSP digital process accuracy class is 0.02 grade, and frequency generator's input is connected to DSP's output, and the DSP output is connected to the pulse interface. The utility model relates to a science, simple operation, accurate reliable are checied during can realizing carrying out automation to electric energy metering device or instrument and equipment, are showing the detection efficiency and the detection accuracy that promote the detecting system accuracy to effectively promote whole detection achievement efficiency.
Description
Technical field
The utility model belongs to electrical measurement, instrument field, especially a kind of 0.02 grade standard table for the stability test of access type three-phase meter verification system.
Background technology
Electric energy has become that human society depends on for existence and development must indispensable a kind of important energy source, all activities of the mankind nearly all have close relationship with electricity, and electric energy meter detects the direct measuring instrument that electric energy uses standard, how to ensure that accurate, efficient, the effort of electrical energy meter calibration improve the verification efficiency of electric energy meter, just become pendulum needs solution badly problem in gauge check department at different levels.
In order to keep the reliability of electric power meter, testing apparatus, ensure electric energy value traceability and transitivity accurately and reliably, periodically examining and determine instrument and equipment according to relevant regulations stipulate, calibrate is one of effective way.Generally, in the check-verifying period of electric energy meter calibrating apparatus, electric energy metrical instrument equipment can normally work, the continual and steady of metering performance can be kept, but in actual use, due to the impact of the many factors such as method of operating, environmental baseline, frequency of utilization, transport, vibration, the performance of instrument and equipment may be made to change, ND fault and accident even occur.In order to ensure metrological standard unit, measuring equipment in twice calibrating, calibration intervals accurately and reliably, and keep good degree of confidence, correlometer gauge model is proposed verification request during measurement standard and measuring equipment.
Period verifies the confidence level referred to as keeping equipment Alignment state, between adjacent twice calibrating, calibration, and verification standard or measuring equipment carried out by suitable check standard and suitable method.It is the every metering performance index whether keeping when calibrating last time in order to judgment device that period verifies, and ensures that measuring process is controlled, guarantee transmission of quantity value accurately and reliably and degree of confidence.At present, the method that period verifies adopts detection of being reached the standard grade by electric energy meter to be measured, detection line is provided with and tens ofly reaches the standard grade detection demand to meet a large amount of electric energy meter to hundreds checkout equipment, the calibration of the accuracy of detection of this multiple stage checkout equipment itself becomes the another difficult problem ensureing electric energy meter accuracy of detection, because the volume of existing equipment own is large, weight large, it is mobile to be difficult to, need to carry out dismounting, wiring, calibration detection to checkout equipment respectively by manually carrying correcting device, often each calibration cycle time is long, and labor workload is large, inefficiency.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art part, provides a kind of design science, compact, accurately and reliably for 0.02 grade standard table of access type three-phase meter verification system stability test.
The utility model solves its technical matters and takes following technical scheme to realize:
1, a kind of 0.02 grade standard table for the stability test of access type three-phase meter verification system, it is characterized in that: the length of the physical dimension of this electric energy meter is 290 × 170 × 85mm, watchcase main body is a cube structure, in watchcase front center, bar code screen is installed, the special bar code of this bar code screen for arranging this standard electric energy meter;
At housing bottom plate, copper styletable and pin terminal are set, in watchcase, mainboard is installed, class of accuracy is 0.02 grade, at equal interval, mainboard both sides, multiple coupling bolt is installed, mainboard is spaced 3 current transformers are installed, each current transformer is all connected to three adjacent copper styletable by connecting copper coin, mainboard also installs divider resistance and digital signal processor DSP, the pulse interface in DSP output terminal connecting contact pin terminal; The output terminal of DSP is connected with 485 communication interfaces, and the baud rate of this 485 communication interface is 9600;
Access infrastructure comprises installing plate, contact pin, copper post, support and cylinder, and support is horizontally installed with a cylinder, and the equal symmetry in both sides, piston rod end of this cylinder is fixed with an installing plate, and the installing plate of these both sides enters horizontal reciprocating movement by air cylinder driven synchronization line; The upper and lower interval of installing plate is fixed with and copper styletable and pin terminal contact pin and copper post one to one set by standard scale housing bottom plate, copper post is 9 that are horizontally arranged at interval, adjacent every three copper posts are all communicated with a built-in mutual inductor in installing plate, installing plate is built-in with three mutual inductors of corresponding three-phase detection, and the testing circuit of detection system carries out corresponding test through mutual inductor access standard scale.
And, the three-phase detection voltage that copper styletable obtains exports the input end being connected respectively three divider resistances, the output terminal of these three divider resistances is all connected with A/D converter, and the output terminal of this A/D converter is connected respectively to the input end of DSP, and DSP is digital signal processor; The three-phase detection current that copper styletable obtains exports and is connected respectively three current transformers, the output terminal of these three current transformers is connected to A/D converter, the output terminal of A/D converter is connected to the input end of DSP, the input end of the output terminal rate of connections generator of DSP, the output of pulse signal of frequency generator is to the pulse interface in pin terminal.
Advantage of the present utility model and good effect are:
The utility model design science, simple operation, accurately and reliably, can realize carrying out period automatically to electric power meter or instrument and equipment to verify, effectively can ensure that electric flux value transmit accurately, reliably, remarkable lifting to the detection efficiency of detection system accuracy and detection accuracy, thus effectively promotes whole detection work efficiency.
Accompanying drawing explanation
Fig. 1 is structural front view of the present utility model;
Fig. 2 is the right view (broken section) of Fig. 1;
Fig. 3 is the inner structure schematic diagram of Fig. 1;
Fig. 4 is the upward view of Fig. 1;
Fig. 5 access device structural front view;
Fig. 6 is the right view of Fig. 5;
Fig. 7 is the vertical view of Fig. 5;
Fig. 8 is circuit theory diagrams of the present utility model;
Fig. 9 is copper post terminal connection diagram;
Figure 10 is pin terminal wiring diagram.
Embodiment
Below in conjunction with accompanying drawing, also by specific embodiment, the utility model is described in further detail, and following examples are descriptive, are not determinate, can not limit protection domain of the present utility model with this.
A kind of 0.02 grade standard table for the stability test of access type three-phase meter verification system, measure-alike all with Q/GDW1356-2013 three-phase intelligent electric energy meter shell of the length of the physical dimension of this electric energy meter, length × wide × height is of a size of 290 × 170 × 85mm, Q/GDW1356-2013 three-phase intelligent electric-energy meter is state's net 2013 electric energy meter general at present, can be directly installed on the electric energy meter tray of existing verification system electric power meter, be convenient in automatic calibration system, automatically disconnect line and circulate;
Be described with direction shown in accompanying drawing 1, watchcase 1 main body is a cube structure, a reserved viewing area 3 is fixed with in watchcase upper front end, reserved bottom, viewing area is provided with multiple pilot lamp 2, the pilot lamp of the present embodiment is respectively the power light whether display is energized, and for showing the pulse pilot lamp of pulse signal;
Watchcase front center below reserved viewing area is provided with bar code screen 4, this bar code screen is for arranging the special bar code of this standard electric energy meter to distinguish with common electric energy meter to be detected, by standard electric energy meter Data Enter verification system, when upper table, measuring apparatus can automatically identify this standard electric energy meter according to blind table bar code.
Watchcase above bar code screen is provided with one button (in figure non-label) is set, for arranging the bar code information of this standard electric energy meter.
Arrange copper styletable 10 and pin terminal 11 at housing bottom plate 6, the connection terminal arrangement mode of this standard electric energy meter is identical with through the arrangement position of mutual inductor access type three-phase intelligent electric-energy meter connection terminal, is specially:
On the rear portion of housing bottom plate, lateral separation is provided with 9 copper styletable 10 for being connected with detection copper post, three often adjacent copper styletable are one group of corresponding circuitry phase, copper styletable shown in the sub-respective figure 8 of these 9 copper styletables 1., copper styletable 2., copper styletable 3., copper styletable 4., copper styletable 5., copper styletable 6., copper styletable 7., copper styletable 8. and copper styletable 9., and be shaped with the N line interface that shields 10.;
At the front cross interval at housing bottom plate, multiple pin terminal is set, pin terminal (13) is to pin terminal (28), pin terminal position arrangement mode is identical with the arrangement position of three-phase intelligent electric-energy meter connection terminal, see accompanying drawing 6, wherein pin terminal (24) and pin terminal (25) are 485 communication interfaces.
Mainboard 8 is installed with by limit fastener 7 in watchcase, mainboard becomes triangle disposition be spaced and 3 current transformers 9 are installed, each current transformer is all connected to three adjacent copper styletable by connecting copper coin 12, mainboard also installs divider resistance and digital signal processor DSP, DSP output terminal connecting contact pin terminal.For the ease of stable fixing mainboard and watchcase, at equal interval, mainboard both sides, multiple coupling bolt 5 is installed.
The access infrastructure of miniature table is see accompanying drawing 5 to accompanying drawing 7, access infrastructure comprises installing plate 13, contact pin 14, copper post 15, support 16 and cylinder 17, support is horizontally installed with a cylinder, the equal symmetry in both sides, piston rod end of this cylinder is fixed with an installing plate, and the installing plate of these both sides enters horizontal reciprocating movement by air cylinder driven synchronization line; The upper and lower interval of installing plate is fixed with and copper styletable and pin terminal contact pin and copper post one to one set by standard scale housing bottom plate, copper post is 9 that are horizontally arranged at interval, adjacent every three copper posts are all communicated with a built-in mutual inductor in installing plate, installing plate is built-in with three mutual inductors of corresponding three-phase detection, and the testing circuit of detection system carries out corresponding test through mutual inductor access standard scale.
The Wiring connecting structure of the present embodiment connection terminal is see shown in accompanying drawing 9:
Miniature standard scale inner connecting structure, copper styletable is sub 1., the current transformer of copper styletable 2. and in copper styletable 3. connection one table body, copper styletable is sub 4., the current transformer of copper styletable 5. and in copper styletable 6. connection one table body, and copper styletable is sub 4., the current transformer of copper styletable 5. and in copper styletable 6. connection one table body;
Miniature standard scale external cabling structure, 3. 1. copper styletable be connected the mutual inductor of U phase line with copper styletable, and 2. copper styletable connects U phase line and form loop; 6. 4. copper styletable be connected the mutual inductor of V phase line with copper styletable, and 5. copper styletable connects V phase line and form loop; 9. 7. copper styletable be connected the mutual inductor of W phase line with copper styletable, and 8. copper styletable connects W phase line and form loop.
The present embodiment Plays electric energy meter circuit syndeton and principle of work:
The voltage output end that copper styletable obtains connects the input end of divider resistance by wire, the output terminal of divider resistance connects the input end of A/D converter, the output terminal of A/D converter is connected to the input end of DSP, voltage exports and samples through electric resistance partial pressure, after becoming small-signal, do A/D conversion and send DSP process; DSP is digital signal processor.
The current output terminal that copper styletable obtains is input to three current transformers 9 respectively by connection copper coin 12, the output terminal of these three current transformers is connected to A/D converter, the output terminal of A/D converter is connected to the input end of DSP, electric current exports after current transformer sampling becomes small-signal, do A/D conversion and send DSP process, DSP synchronously carries out U, I real-time operation, obtain real power value P, and by frequency division generation high-frequency electrical energy pulse and the low-frequency electrical energy pulse respectively of P controlled frequency generator, the input end of the output terminal rate of connections generator of DSP, the ratio that frequency generator produces exports as electric energy high impulse higher than the high-frequency impulse of P, obtaining ratio lower than the low pulse of low-frequency electrical energy of P by frequency divider frequency division is the low pulse of electric energy, above-mentioned height, low-frequency electrical energy pulse outputs to pulse interface, output interface position is pin terminal 19 and 20 position, shown in accompanying drawing 7 pin terminal wiring diagram,
The output terminal of DSP is connected with 485 communication interfaces, and the baud rate of this 485 communication interface is 9600.While measuring P, DSP also completes the measurement of voltage, current true virtual value phase place, frequency etc., this measured value amount sends robotization calibration streamline to by 485 communication interfaces, and 485 communication interface positions are pin terminal 24 and pin terminal 25, sees shown in accompanying drawing 7 pin terminal wiring diagram.
This standard electric energy meter possesses following performance:
Class of accuracy: 0.02 grade;
Reference voltage: 3 × 220/380V; 3 × 57.7/100V (80% ~ 115%);
Reference current In:1.5A; Imax:6A, Imin:0.15A; Through mutual inductor access type;
Low-power consumption: voltage circuit power consumption <8W (18VA); Current circuit power consumption <0.6VA,
Wide service area: 45V ~ 460V alternating voltage is powered;
Apparent size: meet Q/GDW1356-2013 three-phase intelligent electric-energy meter pattern code requirement;
Communication interface: RS485, baud rate 9600, can be arranged.
The verifying process flow step of this standard electric energy meter on verification system electric power meter is as follows:
(1) prepare: the standard electric energy meter arranging this three-phase intelligent electric-energy meter, the precision of this standard electric energy meter is 0.02 grade, and the electric energy meter that general resident uses, normal tasks electric energy meter namely to be detected is 2 grades, and standard electric energy meter precision is far above task electric energy meter;
Special bar code is formulated to standard electric energy meter, to distinguish with normal table; By standard electric energy meter Data Enter verification system, automatically can identify according to blind table bar code when upper table;
(2) fill table: table position place on the streamline run, on the empty pallet manually standard electric energy meter being put into arbitrarily or specifying, then standard electric energy meter pallet is put into bindings bit and normal task electric energy meter and mix at random and flow into automatic calibration line body;
(3) bind: standard electric energy meter is after bindings bit, and streamline server can be bound the information of the bar code number of standard electric energy meter and this pallet according to the scheme pre-set;
(4) test: standard electric energy meter flows through on streamline after each test special machine, and transfer matic can perform according to predetermined testing program, selects to do experiment to standard electric energy meter or do not do experiment;
(5) following table: standard electric energy meter is after test finished by each special plane, streamline enters following table flow process according to the flow process of setting, standard electric energy meter is after flowing through following table flow process, PLC can automatically according to the standard electric energy meter on this pallet of binding information identification, do not perform following table flow process, but standard electric energy meter pallet is let pass automatically, standard electric energy meter pallet can flow through bindings bit automatically, and circulation performs step flow process (3), (4), (5);
(6) data processing: the calibrating data of standard electric energy meter are inquired about in systems in which according to task number and standard electric energy meter bar code, obtains and detects data and derive this calibrating data.
Although disclose embodiment of the present utility model and accompanying drawing for the purpose of illustration, but it will be appreciated by those skilled in the art that: in the spirit and scope not departing from the utility model and claims, various replacement, change and amendment are all possible, therefore, scope of the present utility model is not limited to the content disclosed in embodiment and accompanying drawing.
Claims (2)
1. a 0.02 grade standard table access infrastructure for the stability test of access type three-phase meter verification system, it is characterized in that: the length of the physical dimension of this electric energy meter is 290 × 170 × 85mm, watchcase main body is a cube structure, in watchcase front center, bar code screen is installed, the special bar code of this bar code screen for arranging this standard electric energy meter;
At housing bottom plate, copper styletable and pin terminal are set, in watchcase, mainboard is installed, class of accuracy is 0.02 grade, at equal interval, mainboard both sides, multiple coupling bolt is installed, mainboard is spaced 3 current transformers are installed, each current transformer is all connected to three adjacent copper styletable by connecting copper coin, mainboard also installs divider resistance and digital signal processor DSP, the pulse interface in DSP output terminal connecting contact pin terminal; The output terminal of DSP is connected with 485 communication interfaces, and the baud rate of this 485 communication interface is 9600;
Access infrastructure comprises installing plate, contact pin, copper post, support and cylinder, and support is horizontally installed with a cylinder, and the equal symmetry in both sides, piston rod end of this cylinder is fixed with an installing plate, and the installing plate of these both sides enters horizontal reciprocating movement by air cylinder driven synchronization line; The upper and lower interval of installing plate is fixed with and copper styletable and pin terminal contact pin and copper post one to one set by standard scale housing bottom plate, copper post is 9 that are horizontally arranged at interval, adjacent every three copper posts are all communicated with a built-in mutual inductor in installing plate, installing plate is built-in with three mutual inductors of corresponding three-phase detection, and the testing circuit of detection system carries out corresponding test through mutual inductor access standard scale.
2. the 0.02 grade standard table access infrastructure for the stability test of access type three-phase meter verification system according to claim 1, it is characterized in that: the three-phase detection voltage that copper styletable obtains exports the input end being connected respectively three divider resistances, the output terminal of these three divider resistances is all connected with A/D converter, the output terminal of this A/D converter is connected respectively to the input end of DSP, and DSP is digital signal processor; The three-phase detection current that copper styletable obtains exports and is connected respectively three current transformers, the output terminal of these three current transformers is connected to A/D converter, the output terminal of A/D converter is connected to the input end of DSP, the input end of the output terminal rate of connections generator of DSP, the output of pulse signal of frequency generator is to the pulse interface in pin terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520429250.7U CN204855780U (en) | 2015-06-19 | 2015-06-19 | A 0. 02 grade of standard table for inserting system stability is experimental for examination of formula three -phase table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520429250.7U CN204855780U (en) | 2015-06-19 | 2015-06-19 | A 0. 02 grade of standard table for inserting system stability is experimental for examination of formula three -phase table |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204855780U true CN204855780U (en) | 2015-12-09 |
Family
ID=54746317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520429250.7U Active CN204855780U (en) | 2015-06-19 | 2015-06-19 | A 0. 02 grade of standard table for inserting system stability is experimental for examination of formula three -phase table |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204855780U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568396A (en) * | 2019-03-11 | 2019-12-13 | 河南省计量科学研究院 | Installation type standard meter and system and method for calibration by using same |
-
2015
- 2015-06-19 CN CN201520429250.7U patent/CN204855780U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110568396A (en) * | 2019-03-11 | 2019-12-13 | 河南省计量科学研究院 | Installation type standard meter and system and method for calibration by using same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102305922B (en) | On-load detection method and device for intelligent optical fiber electric energy meter in substation | |
| CN103760515A (en) | Automatic multi-electricity-meter-position parameter setting and detecting method | |
| CN104991216A (en) | Period check method for straight-in type three-phase intelligent electric energy meter automation calibration system | |
| CN104914397A (en) | Test quality check method for access-type three-phase intelligent electric energy meter automatic verification system | |
| CN103809151A (en) | Multi-meter-position parameter automatic setting and detecting device | |
| CN109212460B (en) | Communication unit detection tool and detection method | |
| CN104914395A (en) | Test quality check method for single-phase intelligent electric energy meter automatic verification system | |
| CN204855778U (en) | A 0. 02 grade of miniature standard electric energy meter for examineing and determine check during directly going into formula three -phase intelligent ammeter verification system | |
| CN202886517U (en) | Testing device of power distribution terminal | |
| CN204855780U (en) | A 0. 02 grade of standard table for inserting system stability is experimental for examination of formula three -phase table | |
| CN102175983A (en) | Method for testing multifunctional watt-hour meter reading time of electric quantity collector for watt-hour meter | |
| CN204855776U (en) | A 0. 05 grade of miniature standard electric energy meter for passing through mutual -inductor is checied during inserting measurement of formula three -phase intelligent ammeter electric energy | |
| CN204832487U (en) | A 0. 05 grade of miniature standard electric energy meter for passing through it is experimental that mutual -inductor inserts formula three -phase intelligent ammeter examination system stability | |
| CN204882850U (en) | A 0. 02 grade of miniature standard electric energy meter that is used for single -phase intelligent ammeter verification system repeatability experimental | |
| CN104914401A (en) | Period check method for access-type three-phase intelligent electric energy meter automatic verification system | |
| CN204832489U (en) | A 0. 02 grade of miniature standard electric energy meter for straightening go into experiment of formula three -phase intelligent ammeter examination system stability | |
| CN204832495U (en) | A 0. 05 grade of miniature standard table for straightening go into and check during verification system is shown to formula three -phase | |
| CN204855777U (en) | A 0. 02 grade of miniature standard electric energy meter for straightening go into experiment of formula three -phase intelligent ammeter verification system repeatability | |
| CN204832494U (en) | A 0. 02 grade of miniature standard table for inserting examination of formula three -phase table electric energy metering device | |
| CN204758815U (en) | A 0. 02 grade of miniature standard electric energy meter for passing through mutual -inductor is checied during inserting formula three -phase intelligent ammeter verification system | |
| CN204832492U (en) | A 0. 02 grade of standard table for inserting formula three -phase table verification system repeatability is experimental | |
| CN204832491U (en) | A 0. 05 grade of miniature standard electric energy meter for passing through it is experimental that mutual -inductor inserts formula three -phase intelligent ammeter verification system repeatability | |
| CN204740339U (en) | A 0. 02 grade of miniature standard electric energy meter for examineing and determine single -phase intelligent ammeter calibrating installation | |
| CN204731402U (en) | For 0.02 grade of miniature standard electric energy meter of verifying during single-phase intelligent electric energy meter verification system | |
| CN204855779U (en) | A 0. 02 grade of miniature standard electric energy meter for system stability is experimental for examination of single -phase intelligent ammeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |