BMM (Blind Measuring Module) is multi functional unit which supports only 3P4W installation. BMM take 3 Voltage inputs & 3 Amps inputs for measurement. BMM measures phase wise Voltage, Amps, PF, Power as well as System Power, Energy,Frequency. For demand calculation BMM has Fixed 30 Minute window, based on Real Time Clock for KW as well as KVA.
BMM provides one RS485 port with Modbus-RTU protocol to communicate with external world. As BMM receive any data over RS485 then “RxD” led will glow and if BMM is responding over RS485 then “TxD” led will glow. As unit power up, “POWER” led glows.
BMM provides pulse on led (1000 Pulse/KWh) as well as on isolated opto coupler.
|Input||Supply||Three Phases and Neutral of a 3P4W system|
|Voltage||Direct Voltage Input : Up to 300V L-N
PT Ratio : 1
Burden : 1 VA
|Current||Secondary Current Input: - -
CT Ratio : 1
Range of Reading : up to 70 Amps
Burden : < 1.0VA
Overload : 75A RMS Continuous
|PowerSupply||Auxiliary Supply: 90 - 270 VAC (P-N), 50-60 Hz. (Power Up from 3 Phase Voltage Input)|
|MEASUREMENT||True RMSBasicParameters||Voltage(Volts L-N & L-L)||VL-N Accuracy : 0.5% of Reading
VL-L Accuracy : 1.0% of Reading
|Current(Amps IR, IY, IB)||Accuracy : 1% of Reading|
|Line Frequency||46.5 to 63.5 Hz, Accuracy : 0.3% of Reading|
|Power||Active Power (P)||Accuracy : 1% of Reading(For IPFI>0.5)|
|Reactive Power (Q)||Accuracy : 1.5% of Reading(Between 0.5 Lag to 0.8 Lead)|
|Apparent Power (S)||Accuracy : 1% of Reading|
|Power Factor||For Individual phases and System.
Accuracy : 1.0% of Reading (IPFI≥0.5)
Range of Reading : 0.05 to 1.00 Lag/Lead
|Energy||Total Active Energy (KWh)||Range of Reading : 0 to 9999999.9 KWh
Accuracy : Class 1 as per IS13779
|Total Apparent Energy (KVAh)||Range of Reading : 0 to 9999999.9 KVAh
Accuracy : Class 1
|Total Apparent Energy (KVARh)||Range of Reading : 0 to 9999999.9 KVARh
Accuracy : Class 1
|Demand||Active Power (KW) Demand – 30 Minute Fixed Window|
|Apparent Power (KVA) Demand - 30 Minute Fixed Window|