Introduction
In line with the development of market, our company has successfully developed Low Voltage Power Line Carrier Automatic Meter Reading System (LV PLC AMR system). Aiming at our network and basing on large-scale integration (LCI), AMR system adopts 64-bit spread spectrum technology. Regarding signal processing, AMR system uses blur control and modern signal processing technology to widen pure spread spectrum and relay technology to improve communication ability. This technology has applied for two national patents. AMR system is the same with meter data acquisitioning, analyzing, and controlling, which has passed the test by national industrial power academy of sciences with the authorized type CGZ288-1j & CZL288-1c.Besides Many successful experiences occur in Changzhou, Jiangsu province.
System Parameter
● Communication channel : bi-directional low voltage power line carrier
● Communication code-error rate: < 10-7
● System real-time meter-reading accuracy : accumulative error< 0.05kWh
● PLC signal level：< 0.6VP-P
● Signal bandwidth : < 30kHz
● Haul : 1km (main line)
● Power-off data storage : > 30 years
● Static anti-jamming: > 8kV
● Pulse block anti-jamming: 4kV，normal communication & accurate counting
● Surge anti-jamming: > 5kV
● Relectromagnetic field anti-jamming: 50－1000MHz,field strength 10V/m
● Working temperature: -20℃ －+ 65℃
● Working voltage: 176V－264V
● Capacity: 1000 meter/ transformer
● Electric network structure: automatic apperceive
● Relay reading≤ grade 3
Function
Master Station:
● Appoint the transformer to read meters automatically
● Read the appointed user
● Set DCU parameter
● Real-timely inspect and control appointed user’s consumption
● Store & count consumption data and then make & print report form
● Analyze meter-data under the transformer
● Analyze transformer line-loss
● Count transformer consumption and user consumption
● Unwatched: after opening PC & modem and starting automatic reading, system will read meter at preset time automatically and then store the data .
DCU
1)Control
● The background sets the parameters remotely or directly, including: database, clock, time-period, relay parameter, start reading, stop reading and so on.
● Read the meter under the transformer during reading period.
● Store data: 31 times data at most
● Start relay function automatically
● Based on background set, freeze reading meters under the transformer
● Support background alternative command operation
● Smart and self-learning, Apperceive electric network topology structure by analyzing data
● Automatically setup relay path, the more used, the better used
2)Transformer Monitor
● Monitor transformer running, including: current, voltage, active/reactive power, power factor, alarm for and record the deficient voltage, deficient current, over-voltage & overload, so that the power company can notice at the first time.
● Record when and how long the power is off
● Monitor oil pressure and temperature
ATU
● Acquisition, process, and store meter consumption
● Transfer consumption and meter status to DCU by power line
● Read meter automatically
● Power line carrier communication by several modulate mode
● Mutual automatic relay
Application
● The system is the same with PLC meter-reading residential illumination.
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Technique support: