Chapter 1 Introduction
EM720 Power Quality and Revenue Meter
9
Fast Transient Recorder
An optional high-voltage fast transient recorder (EM720T)
detects impulsive and low frequency oscillatory transient
overvoltages with peaks up to 2kV and durations from 20
microseconds.
Digital Fault Recorder
An embedded fault recorder is capable of recording fault
currents up to 50 amps.
Meter Features
Billing/TOU
•
Class 0.2S IEC 62053-22
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
(embedded Hebrew holidays till 2039 for Israeli
customers), one-time 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 from 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
