DESCRIPTON The DDS28A single-phase two-wire static watt-hour meter is developed and designed specially for PEA and MEA in Thailand. It is suitable to measure active energy, reactive energy, r.m.s (root mean square) voltage, r.m.s current demand (kW, kVA, kvar[optional]) in alternating current circuit. It can be used yet to record maximum demands of kW, kvar and kVA in a month. All of these maximum demands in kW, kvar, kVA and accumulative total active energy (kWh) and total reactive energy (kvarh) consumed are stored in a memory for 12 months The meter is constructed and designed in such a way as avoid introducing any danger in normal use and under normal working conditions, so as to ensure especially personal safely against electric shock, effects of excessive temperature, spread of fire and penetration of solid objects, dust and water. The measuring range of the watt-hour meter is suitable to small and middle customer who consumed generally less than 11 kW of power. Its percent error of metering energy is all not more than +/- 1% for these customers. All of billing data for 12 months is read out from the meter at one time through communication with hand-held unit (common meter reading instrument). The information of consumption, for example, maximum demand, average power factor of load is also understood. The supply voltage, current in circuit, accumulative active energy and reactive energy [optional] also can be observed on LCD of the meter. So it a very excellent static single-phase watt-hour meter, and is of great value to a distribution power department.
Single-Phase Two-Wire Static Watt-Hour Meter
NORMAL OPERATING CONDITIONS AND LIMITED CONDITIONS
Normal operating temperature -40 oc to 70 oc
Relative humidity below 90%
Altitude below 3000 m
Limited temperature above -45 oc and below 80 oc
Limited relative humidity below 100%
SPECIFICATONS
Type DDS28A
Reference Voltage 220 V
Operational Reference Voltage 110 , 120 , 220 , 230 , 240 V
Maximum Current 100A
Reference Frequency 50/60 Hz.
Accuracy Active (IEC62053-21): class 1 Reactive (IEC62053-23) : class 2
Communication protocol IEC62056-21
Constant 1600 imp/kWh and 1600 imp/kvarh
Reference temperature 23 oc (can be customized designation)
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