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Introduction :
Shresta's solutions for power metering have helped fuel the utility
industry's migration to solid state metering, while
simultaneously driving down costs and improving anti-tampering
capabilities. Our Solution offer the highest level of
integration and flexibility in the industry and are ideal for
developing low cost, intelligent utility meters for
residential and industrial applications.
Shresta’s single phase meter design uses a highly
integrated SOC that combines a microprocessor core, Real Time
Clock (RTC), FLASH memory and LCD driver. The IC’s patent
pending Single Converter Technology with a 22-bit delta-sigma
ADC, 3 analog inputs, digital temperature compensation,
precision voltage reference and 32-bit computation engine
supports a wide range of residential metering applications
with very few low cost external components.
Features :
- Compact Size (85mm x 85mm)
- Easy-to-use Windows Utility for calibration and testing
- Easy programming via on board emulator Port
Specification :
| Accuracy |
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| Single Phase 2 Wire System |
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| Power |
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| Current Rating |
| Power Factor |
| Power Consumption |
| Starting Current |
| Frequency |
| Voltage Withstand |
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| 10A (Ib) – 60A (Imax) |
| 0 to Unity (Lag & Lead) |
| Voltage Circuit:- 1W and 4VA |
| Current Circuit:- 1VA at 5A |
| 0.2% of Ib (20mA) |
| 50Hz +/- 5% |
| 440VAC |
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| Other Parameters |
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- Pulse Power
- Reverse
- Magnetic Tamper
- Earth Load Tamper
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| Alpha Numeric LCD with Backlight (Other LCD Option)
Normal Working :
On Push button :
- LCD check
- Date and Time
- Instantaneous Active Load in
Watt
- Active Cumulative Energy with Decimal Digit
- Instantaneous Voltage (Accuracy +/- 1%)
- Instantaneous Current (Accuracy +/- 1%)
- Cumulative Active Energy (KWh) for each Calendar month for Previous Six Months
- Maximum Demand (KW MD) in a Calendar month for Previous Six months with Date and Time
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| Optical Port for Meter Reading |
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- Reversal of Phase, Neutral or both
- Reversal of Line and Load Terminals
- Load through Local Earth
- Partial Load through Earth Temper
- Neutral Disconnect
- AC/DC Magnetic field up to 0.2 Tesla
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| Last 20 events Magnetic Tamper, if magnetic field on meter is greater than 0.2 Tesla |
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| Other Features |
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| Separate Battery with Pushbutton arrangement to read Display
parameter during Power fail. |
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- RTC battery Status
- LCD Check
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- Real time & Date
- Instantaneous voltage
- Instantaneous Current
- Instantaneous Active load in watt
- Active Energy
- Maximum Demand with Date and Time
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| Windows utility / HyperTerminal |
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| Voltage Circuit :
1W and 4VA / Current Circuit:-
1VA at 5A |
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| Environmental |
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| 0 to 55°C (32 to 131°F), 5 to 95%RH |
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| -20 to 85°C (-4 to 185°F), 5 to 95%RH |
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