Distribution Grid Monitor (DGM)

Down the Line Monitoring for Voltage Optimization

The DGM provides accurate end-of-line voltages to Conservation Voltage Reduction (CVR) and Volt-VAR Optimization (VVO) schemes. When equipped with current inputs the DGM can provide complete SCADA data from unmonitored rural substations and step-down sites. In FLISR schemes, the DGM can provide indication of overcurrent fault and can provide peak fault currents.

The DGM is a power monitoring solution–also known as a “primary in a box”–that consists of a Bitronics M661 meter, matched Lindsey LEA (low energy analog) sensors, and cabling, plus an optional OrionMX RTU for cybersecurity, I/O, and automation functions.

Advantages of the Bitronics DGM:
• Delivered complete with packaged meter, sensors and cables.
• Can be easily installed without taking an outage. (Two installs/day/truck.)
• High accuracy: better than .5%
• Voltage measurements not affected by load.
• Comes “SCADA ready” with 120V-scaled DNP3 points.

Measurements available from the DGM:
• 3-phase voltages and currents
• Real and reactive power, power factor
• Frequency
• Fault pickup and peak fault currents


End-of-Line (EOL) and Along-the-Line voltage monitoring
Monitor pole-mounted cap banks and voltage regulators
Volt-VAR Optimization (VVO)
Conservation Voltage Reduction (CVR)
Fault Indication using a definite time overcurrent relay element
Capture and Report Peak Fault Current


Full measurement set including volts, amps, watts, kWh, demands, peaks and frequency
Peak fault currents and time overcurrent pickup
Voltage measurements: 0.2% of reading (3.5 to 20V rms)
Current Measurements: 0.25% of full scale (200V rms input to transducer)
Updated every cycle


Operating temperature range:
-40° to +70°C, storage temperature -40° to +85°C
0-95% non-condensing
Surge withstand:
ANSI/IEEE C37.90.1: 2002

Specifications (M661P3)

4” H x 5.25” W x 6.34” D (102mm H x 133mm W x 161mm D)
1.8 lbs. (.81 kg)
Power Supply:
120V ac or 240V ac
Voltage Inputs:
Four terminals (A, B, C, and Common)
Present 1MΩ load to the voltage sensor, up to 20V ac
- Three terminals
- Input impedance > 10Kohm, nominal
- Inputs are 10V rms (representing 600A rms) ◊ Accommodates peaks of 200V rms for measuring fault currents
Communication Ports:
- RJ45 10BaseT/100BaseTX port for service port functions and protocols
- Serial port RS-232/RS-485 four-wire
- One discrete input, used for door switch

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