EM720

The EM720 series is a group of state-of-art multi-microprocessor-based digital instruments that incorporate the capabilities of a power quality analyzer, energy meter, fault and data recorder and programmable controller, oriented for substation, industrial and commercial areas. These instruments provide three-phase measurements of electrical quantities in power distribution systems, monitoring external events, operating external equipment via relay contacts, fast and long-term on-board recording of measured quantities, transient voltages measurements up to 2KV, fault recording of currents up to 50A, harmonic analysis and disturbance recording. The expertmeter EM720 is an electronic revenue accuracy multi-rate polyphase static meter integrated with a multi-function powermeter, an EN50160 power quality recorder, a digital fault recorder and a programmable logical controller, and provided with a wide range of digital I/O and communication options. A high-contrast graphical LCD display with backlight allows easy local meter readings and servicing. Two serial communication ports (infrared and RS232/RS485), a USB port, Ethernet and a wireless GSM/GPRS modem allow local and remote automatic meter readings and setup though the supplemental communication software or user data acquisition software.

  • Precise Class 0.2S Active Energy and Power Demand Meter, Multiple Tariffs & Time-Of-Use (TOU, 16 Summary energy and demand registers for substation energy management, accumulation of energy pulses from external watt-meters, block and sliding demands), transformer and line losses, unique anti-tampering and self-test functions
  • State of the art Power Quality Recorder (onboard PQ analyzer according to EN50160; programmable thresholds and hysteresis; ready-for-use reports; sags/swells, interruptions, frequency variations; flicker, temporary overvoltages, and transient overvoltages, voltage unbalance, harmonic and interharmonics voltages)
  • Digital Fault Recorder (onboard fault detector - programmable fault thresholds and hysteresis, up to 50 Amps fault currents, zero-sequence currents and volts, current and volt unbalance; under voltage, neutral current; ready-for-use fault reports - fault currents magnitude and duration, coincident volts magnitude, fault waveforms and RMS trace)
  • Event Recorder for logging internal diagnostics events, control events and I/O operations
  • Four fast Waveform Recorders; selectable AC sampling rate of 32 - 1024 samples per cycle; 20 pre-fault cycles, 1-ms resolution for digital inputs; up to 3 min of continuous recording with an 8 M-byte onboard memory at a rate of 32 samples per cycle, expandable up to 16 M-byte at meter shop
  • Sixteen fast Data Recorders (from ½ cycle RMS to 2-hour RMS envelopes; up to 20 pre-fault cycles; programmable data logs on a periodic basis and on any internal and external trigger)
  • Demand Meter amps, volts, harmonic demands)
  • Programmable Controller (32 control setpoints, OR/AND logic, extensive triggers, programmable thresholds and delays, relay control, event-driven data recording)
  • High-Class 3-phase Power meter (true RMS of volts and amps, powers, power factors, neutral current)
  • Harmonic Analyzer (to 128’th harmonic volts and amps, directional power harmonics and power factor, phasors, symmetrical components)
  • 16 programmable timers from ½ cycle to 24 hours for periodic recording and triggering operations on a timely basis
  • NiMH rechargeable backup power supply unit.
  • Optional Low DC Auxiliary power supply unit
  • Three slots for hot swap field installable option modules
  • Graphic LCD display

 

  • Three AC voltage inputs - up to 480VAC direct line-to-line input voltage, for feeding and measurement
  • Three isolated AC voltage inputs - up to 2KV peak direct line-to-ground and neutral-to-ground input voltage
  • Four standard isolated AC current inputs - 5A nominal input currents and up to 50 A fault overload current
  • Optional isolated low DC power supply input – up to 4KV AC insulation (endurance)
  • The EM720 is equipped with four fast digital inputs (DI), in the basic instrument, two digital inputs (DI) and two digital outputs in optional plug-in module (2DI/2DO module):
    • DI (basic) – 4 Digital inputs – optically isolated input; dry contact, programmable de-bounce time from 1 ms to 1 sec; free linkage to Sequence-of-Events Recorder, Fault Recorder, control setpoints, pulse counters and Energy/TOU subsystem)
    • DI (module) – 2 Digital inputs – optically isolated input; dry contact, programmable sampling rate from ½ cycle to 1 sec; control setpoints, pulse counters and Energy/TOU subsystem)
    • DO – 2 Relay outputs – mechanic or solid-state relay, unlatched, latched and pulse operations, failsafe operation for alarm notifications; programmable pulse width; direct remote relay control through communications

  • The EM720 has extensive communications capabilities:
    • Infrared port (Modbus RTU/ASCII and DNP3.0 protocols)
    • Versatile RS-232/485 universal serial communications port (up to 115,200 bps, Modbus RTU/ASCII and DNP3.0 protocols)
    • Ethernet 10/100 Base-T port (Modbus/TCP or DNP3.0/TCP protocols, up to five non-intrusive simultaneous connections, Telnet service port)
    • USB 1.1 full speed device port (Modbus RTU protocol, 12 Mbps) for fast local communications and data retrieving
    • Cellular GPRS modem (Modbus/TCP or DNP3.0/TCP protocols)
    • 1-ms satellite-synchronized clock - IRIG-B format time-code input

  • The EM720 uses flash memory for storage device firmware that allows future (upgradation) of the device without replacing any hardware component. The new features can be easily added to your device by simply replacing the firmware through a local RS-232/RS-485, USB port or Ethernet port.
  • Modbus RTU
  • DNP 3.0
  • ASCII

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