SATEC EM720 Installation Manual - Manual (Page 5)

Chapter 1 Introduction
1
Chapter 1 Introduction
About This Manual
This manual is intended to assist the user in the installation of the eXpert meter ™ EM720 POWER
QUALITY REVENUE METER Unit . The term ‘ EM720’ ’ is used herein to refer to all models in the series.
This chapter gives an overview of this manual and an introduction to the EM720.
Chapter 2, Installation , provides instructions for mechanical and electrical installation.
Chapter 3, Communications , provides drawings for communications connections and instructions for
printing electrical parameter readings.
Technical Specifications for the
EM720 are found in the Appendix .
About The 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 unit is available in three models:
• EM720 - Basic model – offers energy meter class 0.2S, IEC Power Quality Analyzer according to
EN50160 Standard, all the basic metering, control, and fault and event recording capabilities
• EM720T – Transient Recorder model – adds transient recording capabilities
• EM720U – IEEE Power Quality model – based on IEEE 1159 Standard instead of EN50160
Standard
Features
The EM720 combines in a single enclosure:
• 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, 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)
• 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)
• Demand Meter (amps, volts, harmonic demands)
• 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 time basis
• Low and High range isolated Three-Phase Power Supply unit from the measured voltage inputs,
according to the voltage measurement input range:
− Low Range measurement input nominal rating: 57.7V AC to 120V AC (L-N)
− High Range measurement input nominal rating: 230V AC to 277V AC (L-N)
• 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