SATEC EM920 Installation Manual - Manual (Page 7)

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 ™ EM920
POWER QUALITY REVENUE METER Unit. The term ‘EM920’’ is used herein to refer to all models
in the series.
This chapter gives an overview of this manual and an introduction to the EM920.
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 EM920 are found in the Appendix.
About The EM920
The EM920 series is a of state-of-art multi-microprocessor-based digital instrument, socket
meter base, 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 EM920 has current classes of 10 A and 20 A and offers
precise active and reactive energy metering in 4 quadrants, Power Quality Analyzer according
to EN50160 Standard, all the basic metering, control, and fault and event recording capabilities
The EM920 socket meter is designed to fit into S-Base meter sockets and A-to-S Base
adapters. The meter supports form factors 9S/9A.
Features
The EM920 combines in a single enclosure:
• Precise Class 0.2 Active Energy and Power Demand Meter and better, 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 with 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, up to 50 Amps fault
currents, zero-sequence currents and volts, current and volt unbalance; under-voltage,
neutral current;
• 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 monitoring; 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, power harmonics and power
factor, phasor, symmetrical components)
• 16 programmable timers from ½ cycle to 24 hours for periodic recording and triggering
operations on a time basis
• 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: 120V AC to 277V AC (L-N)
• On board 2 Digital optically isolated Fast Inputs and 1 KYZ relay output.