多功能电表简介英文

Multi-function watt-hour meter profile
Summary
1.1Definition
According to the standards of the power industry DL/T614-1997 for multi-function watt-hour meter definition: "anyone who by measuring unit and data processing unit and other components, except for measuring meritorious (reactive) power outside, still have time-sharing, measuring need such as the quantity of two kinds of above function, and can show, storage and output data watt-hour meter" are considered to be multi-function watt-hour meter. Defined clearly in the four: first, by measuring unit and data processing unit composed; Second, can measurement electricity (meritorious or reactive power, or simultaneously measuring meritorious and reactive); Third, can need quantity, can measuring points, display, storage and output data, Fourth, two or more functions. Because are allowed to have two or more function, so the market multi-functional meter differ in thousands ways, but seems along with the increase of the content of the multi-functional meter as users of multi-functional meter understand deeper and deeper, function more and more like is the development trend of multi-function watt-hour meter.
1.2 Classification
Multi-function watt-hour meter can be divided into two kinds: one call electromechanical multi-function watt-hour meter, the electric power measurement meter unit consists of inductive components, Its data processing unit is composed of SCM. Another type of electric power measurement unit and data processing unit is composed by large-scale integrated circuits, called electronic multi-function watt-hour meter, or called solid-state type multi-function watt-hour meter, also some called motionless multi-function watt-hour meter. Electronic multi-function watt-hour meter, and further into two kinds: one kind measurement unit and data processing unit by a single-chip commputer completes, A measuring unit consists of special measuring chips, data processing functions by single-chip commputer completes
1.3development
In the late 1980s and early 1990s foreign big companies introduced fully electrical multi-function watt-hour meter, like schlumberger, LANDIS & GYR and American GE. In 1993, China, with hunan wei wins electronic Co., LTD is a delegate, with their own patent technology as the foundation, began to be developed their own electronic multi-function watt-hour meter, August 1994 18 first three-phase &four-wire multi-function watt-hour meter research, and through the success of electric and mechanical electronics ministry organization of national technical appraisement. In 1994 September 2 in the first national energy metering exhibition appearance, this table with its distinctive modelling, advanced technology, good performance shocked at home and abroad. 1994 and 1995 two years, neville wins in domestic for two years
of hard propaganda, cultivating market work, during which discerning power industry experts give wei wins great support, especially in hunan province power, their first win the Wisconsin watch hooked on the Internet, they for the extension of electronic multi-function watt-hour meter has made the contribution to also expensive. In early 1996, in the national implementation of electric ordered reply fee rate and load control, such as electronic multi-functional meter from the new promotion open applications. Electronic multi-functional meter with the expanding sales application, a technical nonstop development, neville wins electronic multi-functional meter successively developed with RS - 485 mouth of communication function, whole voltage-absent record function, many event record function, voltage qualification rate measurement functions, load curve of storage, currently because two controlhaving network modification, led watt-hour meter industry adance, domestic electronic multi-function watt-hour meter industry presents a thriving scence of the current production electronic multi-functional meter factory has increased to a dozen
1.4application
Electronic multi-function watt-hour meter application field is very wide, due to the electronic multi-functional meter has strong communication function, make the multi-functional meter is widely used in far far away, for electricity meter automatic data collection and billing, For the power plant appraisal Internet offer commercial operation, For large enterprise internal energy automation management to lay the foundation.
Electronic multi-function watt-hour meter and extended to the birth of dispatching automation, county adjustable integrated automation brought the revolutionary change. YueWei data communications from acquisition pulse. In power data read from afar, meanwhile, can read voltage, current, power of the instantaneous. Substation cancel voltage, current, power transmitter times not be too far away.
In electronic multi-function watt-hour meter after appearing, load control concept undergone a fundamental change. Apart from multi-functional meter itself has super power alarm, jump magazine function, itself can be used when the electric quantitative, but the emergence of multi-function watt-hour meter makes negative control terminals RTU design thought undergone a fundamental change, namely again need not take pulse from pulse watt-hour meter, accumulate computation power, but from the rs-five 485 mouth directly read electricity data. The problem was not lost pulse. ZhuTai and measurement meter no agree-on problem didn't also.
Distribution network distribution network platform, variable monitoring automation is electronic multi-function watt-hour meter and application domain. Variable Taiwan monitoring parameters: power, power, voltage, current, power factor multi-functional meter can offer and, like voltage qualification rate, zero sequence current, power is frozen with variable assessment index multi-functional meter can also provide, in this sense electronic multi-function watt-hour meter indeed can be called matchs variable monitors. This machine with variable monitor is after the type testing have measuring license. Use electronic multi-functional meter measuring parameters for loss calculation, equilibrium analysis, guiding industry expanding editions, guiding
reactive compensation is very fit, very convenient, very accurate.
Electronic multi-function watt-hour meter can monitor various methods TouDian: can use distance meter-reading way 24 hours TouDian surveillance, Multi-functional meter reverse meritorious can plan into positive, prevent TouDian; All the pressure loss records help ZhuiBu power; In table dozens of events record as the plane's black box is same, record the occasional glitches and bad behavior.
2 Homebred three-phase multi-function watt-hour meter new technology
2.1Power, electricity measurement
·three-phase harmonic table, active power measurement 0.2 S level, reactive power measurement 0.5 S level, high accuracy of base wave and harmonic meritorious electric power measure, using real-time integral method calculating total meritorious electric energy, through FFT algorithm, provide base wave, harmonic electric energy and harmonic power direction; xu4
·impact load energy metering theory and algorithm, applying generalized power theory, define any waveform single-phase and three-phase circuit circuit of power, application of sine circuit power theory, traditional non-sinusoidal circuit power theory and generalized power theory impact load meritorious, reactive power, ShiZai, distortion, three-phase asymmetric power electricity computing, xu4
·IIR model based on digital filtering method Hilbert of harmonic reactive power measurement, Hilbert digital filter with advantageous frequency response characteristics, numerical calculation is simple, the calculation of harmonic reactive power, and simulation experiment results only poor 0.02%, xu4
·harmonic active power by research trend analysis method, points out: FFT theory has limitations, actual power load, except base wave and integer times frequency components outside, still have the harmonic existence, need to develop between new algorithm watt-hour meter.
2.2Three-phase power metering special-purpose chip
Robert has base wave/harmonic energy metering three-phase multi-function measurement chip, 16 ∑- train A/D, 24 bit DSP, load dynamic range 1000:1, linearity 0.1%, measuring bandwidth 21st harmonics, integrated temperature sensor, xu4
·Hilbert digital filter harmonic measurement using reactive power of three-phase measurement chips; xu4
·adopting digital parallel algorithm and reduce crystal frequency technology of the low power three-phase active power measurement chip.
2.3Based on the power demand side GPRS communication network management system and its terminals
The system has a long-distance meter reading, electricity anomaly information alarm, power quality testing, and line loss analysis, reactive voltage management and power load control, and other functions, system index for: concurrent data quantity not small 50,000 to collect, in one pass rate no less than 95%, second mining tong rate not less than the rate of more than 98%, telemetry 99.5% readier less than 100 milliseconds, precision.
2.4The real-load remote calibration system
Conditions to meet the requirements of places to be measured current transform is through measurement current transformer of secondary circuits access 0.02, 5/0.5 A intermediate transformer, standard meter and the real-load three-phase connection mode and active, reactive power metering is through industrial PC instruction switch, the real-load real-time error through special channel will be sent to the system master station, the whole system error of 0.1%.。