GE Industrial Solutions POWER LEADER PMCS Network Architecture Guide - Manual (Page 66)

Power Management Control System
Appendix A — IED Descriptions
56
• RMS voltage (Phases A-N, B-N, C-N, A-B, B-C, C-
A)
• Watts (Phases A, B, C and total)
• VARs
• Volt-amps (Phases A, B, C, and total)
• Power Factor, total
• Watt-hours total
• VARs (Phase A, B, C, and total)
• VAR-Hours, Total Lag, Total Lead, and Total
• Current demand
• Peak current
• Watts demand
• Peak watts demand
• Frequency Hz
The PLEPM is available in configurations accepting
direct voltage inputs from 69 Vac to 600 Vac. For system
voltages greater than 600 Vac external PTs must be
supplied. Meter current inputs are rated at 5 amps ac
nominal. External CTs must be supplied.
POWER LEADER Ethernet Gateway
The Power Management Control System host may be
located on a PC connected to an Ethernet. If this is the
case, an IED named the POWER LEADER Ethernet
Gateway is required to connect Modbus-based networks
of IEDs to the Ethernet-based host PC. The POWER
LEADER Ethernet Gateway is an industrial computer
equipped with Modbus and Ethernet communications.
It provides an interface for transferring messages
between an Ethernet network and up to four Modbus
networks containing up to 31 IEDs each, serving as a
“traffic controller” to pass messages between the
Modbus network(s) and Ethernet network.
When the Gateway receives a message from the
Ethernet or Modbus network, it translates the message
protocol and forwards the message to the correct
destination. The Ethernet Gateway converts messages
from the Modbus RTU protocol to Ethernet’s TCP/IP
protocol (and vice versa) directly. No interpretation or
concentration of IED data is performed by the Gateway.
The Ethernet Gateway’s major functions are:
• Relay data from Modbus network(s) to the
PMCS host on the Ethernet network
• Deliver messages and commands from the host
to the attached Modbus and commnet IEDs
POWER LEADER Junction/Outlet Box
The POWER LEADER Junction/Outlet Box allows the
interconnection of as many as four commnet cables to
create system nodes on a commnet segment attached to
the Modbus Concentrator. This is useful to economize
the wiring on a given commnet segment.
POWER LEADER MDP Overcurrent Relay
The MDP Overcurrent Relay is a microprocessor-based,
non-directional overcurrent relay that protects circuits
from phase-to-phase and phase-to-ground faults.
Included with the MDP Overcurrent Relay are four
measuring units, one for each of the three-phase
currents and one for ground or residual current. Each
of the four measuring units includes a time and an
instantaneous overcurrent unit.
Features include:
• Inverse overcurrent, including four character-
istic curves and four values of definite time
protection, and instantaneous overcurrent pro-
tection with programmable delay.
• Phase and ground current measurement.
• Phase and ground current metering.
• Operating time and fault current of the last trip.
POWER LEADER Meter
The POWER LEADER Meter measures currents and
voltages in a single compartment and uses these to
calculate other system parameters. The current inputs
are taken from standard 5 A CT secondaries, while the
voltage inputs are taken from 120 Vac PT secondaries.
The following parameters can be viewed:
• RMS current
• RMS voltage
• Watts
• VARs
• Volt-amps
• Power Factor
• Watt-hours
• VAR-hours
• Current demand
• Peak current
• Watts demand
• Peak watts demand
• Frequency
• Harmonic distortion