Manual

Chapter 1 Introduction
EM920 Power Quality and Revenue Meter 9
Meter Features
Billing/TOU
• Accuracy class 0.2 ANSI C12.20 (current class 10 and
20) active energy and class 0.5 reactive energy
polyphase static meter
• Time-of-Use, 10 billing energy and maximum demand
registers, 8 tariff rates, 4 seasons x 4 types of days, 8
tariff changes per day
• One-time easy programmable tariff calendar schedule,
programmable or calendar scheduled daylight savings
switch dates
• Tariff switching options: automatic via a tariff calendar
schedule, external via communications or digital inputs
• Configurable triggering an end of billing period:
automatic monthly, local via the front display, remote
via communications
• Automatic recording billing energy, maximum demand
and cumulative maximum demand registers for last 24
billing periods
• Automatic 120–day daily energy and maximum
demand profile
• Automatic 120-day/15-minute or 240-day/30-minute
energy load profile
• Easy access to the three previous billing period data
via the front display
• Dynamic instrument transformer correction; up to 8
test points for both ratio and phase angle error
correction for external PTs and CTs
• Power transformer/line loss compensation
Multi-functional Power Meter
• High-accuracy 3-phase Power meter: true RMS volts
and amps, powers, power factors, unbalance, neutral
current, frequency
• Demand Meter: amps, volts, harmonic demands, block
and sliding power demands
• 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