Mega Meg39, User Manual

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PQ monitor MEg39 – user manual
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PQ monitor MEg39
INTRODUCTION
PQ monitor MEg39 measures four voltage and four current values at LV, MV, HV levels.
It provides the functions of recording, electricity meter and analysis of voltage quality, all
performed simultaneously. In the recording function, PQ monitor MEg39, hereinafter
referred to as the monitor, processes all measured values, evaluates powers, energy and
harmonics up to the order of 64. In the function of class A voltage quality analyser, the
monitor evaluates all parameters for measured three voltages and three currents, as stipu-
lated by the standard. It analyses harmonics and centered subgroups of interharmonics
up to the order of 125. When recording events, the monitor, aside from recording the
course of U
RMS1/2
and I
RMS1/2
, makes an oscillographic record of all four values of voltage
and current. The monitor can operate as an oscillograph with the function of recording
the voltage values U1 to U4 and current values I1 to I4 into data memory; an oscillogra-
phic record can be triggered by voltage U4.
The voltage measuring inputs are designed for indirect voltage measurements by means
of instrument transformers for the MV and HV levels and for direct measurements at
the LV level. The current inputs are only designed for indirect measurements by means of
instrument current transformers.
The monitor is supplied by power mains voltage or by DC voltage and it is resistant aga-
inst short-term power outages. The device can be powered by DC 12 V from a separate
UPS supply MEg101.3. This power supply is connected through the HBUS connector
located in the DIN rail on which the device is installed. This bus connector enables con-
necting a communication unit MEg202.3, which enables remote transmission of data
from the device by means of GPRS data service using the GSM mobile network. The
monitor is equipped with four communication interfaces. The serial USB interface is
designed for local parameterization of the device and for downloading of measured data,
the Ethernet and RS485 interfaces are designed for connecting to local technological
networks and the RS232 interface is reserved for service purposes.