High Voltage Metering - Honeywell 3400 Installation Instructions Manual

E-MON CLASS 3400 METER

14.0 HIGH VOLTAGE METERING

kWh Meter Installation Instructions for Use with
Honeywell E-Mon Meters in High Voltage
Applications
The Honeywell E-Mon model # E34-12025HV kWh meter is designed to be used
for monitoring high voltage (2400, 4160, 13200, etc) circuits, either "stand alone"
or in an AMR application.
This meter is intended to be used with the appropriate high voltage Potential
Transformers (PTs) and Current Transformers CTs) supplied by others. The meter
application is centered around a 120 VAC secondary output from the high voltage
PTs and a 5 amp secondary output from the high voltage CTs.
Items addressed by this document include the installation of the E34-12025HV
kWh meter on high voltage circuits as well as the calculations to provide the
correct meter multiplier based on the PT and CT sizes used on the high voltage
conductors.
Installation should be performed by qualified personnel and only according to all
applicable electrical codes.
High Voltage CTs (supplied by others) reduce the primary current (amps) to a
directly proportional 0~5 amp secondary output. As an example, a 0~400 amp
primary becomes a 0~5 amp proportional signal from the secondary output. In
our application, the high voltage CT secondary is installed as a continuous "loop",
with a single conductor connected to both secondary terminals.
To convert the 0~5 amp signal to a 0~ 2 volt signal, Honeywell E-Mon's Current
Sensors are installed on the CT secondary conductor. A set of 25 amp sensors is
used in this application. These sensors have the high voltage CT secondary
conductor passed through them five (5) times (see below) by looping the
secondary conductor as shown in the drawing. The reason for this is so that the 5
amp secondary now appears to the current sensor as a 0~25 amp signal. This
creates a conversion of the CT's primary current to a directly proportional 0~ 2
volt signal which is utilized by the Honeywell E-Mon meter. The example from the
first paragraph has now become a 400 amp to 2 volt device, by this technique.
62-0398—02 56