Chapter 1 Introduction; About This Manual; About The Em720 - Satec expertmeter EM720 Installation Manual

Chapter 1 Introduction

About This Manual

This manual is intended to assist the user in the installation of the
QUALITY REVENUE METER Unit
This chapter gives an overview of this manual and an introduction to the
Installation
Chapter 2,
Communications
Chapter 3,
printing electrical parameter readings.
Technical Specifications for the

About The EM720

EM720
The 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
EM720
The 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
Chapter 1 Introduction
EM720'
. The term '
, provides instructions for mechanical and electrical installation.
, provides drawings for communications connections and instructions for
EM720
are found in the
eXpertmeter™
' is used herein to refer to all models in the series.
EM720.
Appendix
.
POWER
EM720
1