Distribution Grid Monitor

Distribution Grid Monitor

Digital Grid Monitor and Lindsey sensors

Packaged Solution for Distribution Automation Applications

The accelerating proliferation of Distributed Generation (DG) and energy storage assets on the distribution system is driving a need for more points of monitoring and control along the feeder.

Built around the Bitronics® M661P3, the Distribution Grid Monitor (DGM) can be deployed at multiple locations on each distribution line to interface with Lindsey and other pole top sensors. The DGM provides operators with a voltage profile along the full length of line, helpful loading and fault information, and can support Distribution Automation applications.

The DGM calculates better than 0.5% accurate voltages, currents, power, energy, and fault data from raw sensor measurements. A typical DGM system consists of the M661P3 pole top monitor, a local PPXIITD detached display, a NEMA enclosure, and a shelf for utility supplied radio, all packaged as one offering with Lindsey GEN2 sensors and supporting cables. The DGM-60-02-3 is an existing design with the following features:

Lindsey GEN2 Post Insulator Sensors and Cables

  • Less than 1/2 the weight of Lindsey Polysil-based sensors.
  • Hotstick-friendly conductor keeper* with washer-less bolts accommodates a wide range of conductor sizes.
  • Glove friendly cable with bayonet-style waterproof connectors that “snap” when closed, eliminating over- and under-tightening.
  • 0.5% voltage accuracy, with flat harmonic response, and no phase shift. 1% current accuracy with no phase shift.
  • Voltage and current accuracy is independent of weather and conductor diameter.
  • Safe, low voltage, very low current outputs.
  • Hydrophobic cycloaliphatic epoxy construction provides superior performance in high pollution and wet environments.

Bitronics DGM in Enclosure

Bitronics M661P3 Pole Top Monitoring Transducer providing:

  • 12 V dc power for radio (up to 12W)
  • 10 V ac input for three-phase volts and currents
  • Fault indication using a definite time overcurrent relay element (ANSI code 51)
  • Volts, amps, watts, VARs, VA, PF and peak fault current measurements
  • DNP3 output via radio, Ethernet or serial
  • Better than .5% accuracy
  • Connects to multicore Lindsey Sensors
  • Powder-coated steel ANSI 61 Gray 16”x14”x10” Nema 4 Enclosure with brackets with bolt holes for mounting on to pole
  • Bitronics PPXIITD display to provide local indication of measurement values
  • Door switch connected to binary input on M661P3 to provide alarm on door opening
  • Provision for accommodating user-provided radio on shelf

Bitronics Distribution Grid Monitor

Customization of the DGM-60-XX-X can be provided.



  • Configurable RS-232/RS-485 serial port
  • DNP3 or Modbus protocols
    available via serial port and optionally via RJ-45 10/100 TX Ethernet port
  • No need for PC software. Ethernet service port provides access to web server in the instrument so meters can be interfaced with just a web browser for viewing and configuration


  • 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 20Vrms)
  •  Current Measurements: 0.25% of full scale (200Vrms input to transducer)
  • Updated every cycle


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


  • No need for PC software; all settings configured through a web browser.


  • End-of-Line Monitor (EOL)
  • Volt-VAR Optimization (VVO)
  •  Conservation Voltage Reduction (CVR)
  •  Fault Location Isolation and Service Restoration (FLISR)
  •  Fault Indication using a definite time overcurrent relay element (ANSI Code 51)
  •  Report Peak Fault Current

Built for the Poletop

  • Powered from 120V ac or 240V ac
  • One physical digital input provides alarm on door opening
  • Includes a 12V dc output to power a radio modem or other accessory; 600mA output capability
  • Rugged aluminum case
  • Easy to mount with compact transducer footprint
  • Option to purchase in NEMA enclosure


Dimensions: 4” H x 5.25” W x 6.34” D (102mm H x 133mm W x 161mm D)

Weight: 1.8 lbs. (.81 kg)

Power Supply:
120V ac or 240V ac

Voltage Inputs:
– Four terminals (A, B, C, and Common).
– Up to 20V ac

– Three terminals
– Inputs are 10Vrms (representing 600A rms)
– Accommodates peaks of 200Vrms for measuring fault currents

– RJ45 10BaseT/100BaseTX port for service port functions and protocols
– Serial port RS-232/RS-485 four-wire and one binary input

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