Chapter 1 Introduction
10
EM720 Power Quality and Revenue Meter
•
Harmonic Analyzer: up to 50th harmonic volts and
amps; fundamental volts, amps, power and power
factor, phasor, symmetrical components
Power Quality
•
EN 50160 Power Quality (PQ) recorder: onboard power
quality analyzer; programmable limits; EN 50160
power quality event log, EN 50160 compliance
statistics; EN 50160 harmonics survey statistics
•
Power frequency, voltage variations, rapid voltage
changes, IEC 61000-4-15 flicker, voltage dips,
interruptions, temporary overvoltages, transient
overvoltages, voltage unbalance, IEC 61000-4-7
harmonic and interharmonic voltage, mains signaling
voltage
•
High-voltage fast transient recorder (EM720T);
impulsive and low frequency oscillatory transient
overvoltages with peaks up to 2kV and durations from
20 microseconds
•
Ready-for-use compliance statistics reports with the
supplemental software
Fault Recorder
•
Digital Fault recorder: three voltage and four current
channels, up to 8 external digital triggers for
monitoring circuit breakers and protection relays;
onboard overcurrent and undervoltage fault detector;
zero-sequence voltage and current, voltage and
current unbalance; programmable fault thresholds and
hysteresis
•
Up to 50 Amp fault currents
•
Ready-for-use fault reports with the supplementary
software - fault current magnitudes and duration,
coincident volt magnitude, fault waveforms and fast
RMS trace
Event Recorder
•
Event recorder for logging internal diagnostics events,
setpoint and I/O operations
Waveform Recorders
•
Three Waveform recorders: up to 7 channels
simultaneous recording of three voltage and four
current channels
•
Fixed and event-controlled recording time
•
Selectable sampling rate of 32, 64, 128 or 256
samples per cycle; 1-20 pre-fault cycles; 0-2048 post-
fault cycles in event-controlled mode; up to 3 min of
continuous recording at a rate of 32 samples per cycle
•
Optional 4-channel transient voltage recording at 1024
samples per cycle (EM720T)
