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M-3410A Instruction Book
1–4
Single-phase Three-wire
The most common single-phase application is the
three-wire system. This type is found in household
and small commercial installations which are the
most likely to have a single-phase generator. The
wiring for this installation is shown in Figure 2-12.
Since the relay and the communications software
are designed for three-phase applications, the
Directional Power (32) Function will operate correctly,
but the measured quantity will be 1/2 of the actual
value. The pickup must be set to a Per Unit (PU) of
two (2) times the actual kVA, taking the 1/2 factor
into account in determining the PU for the Directional
Power (32) Function. The power displayed on the
primary status monitoring screen will be 1.5 times
the actual kVA, and on the secondary status
monitoring screen will display 1 PU of the three-
phase base power calculated by the relay.
Single-phase Two-wire
The second type of single-phase application is the
120 or 240 volts to ground. The wiring for this
installation is shown in Figure 2-13. The Directional
Power (32) Function is set to pickup at PU of actual
kVA. The power displayed on the Primary Status
Monitoring Screen will be the actual kVA, and the
Secondary Status Monitoring Screen will display 1/3
PU of the three-phase base power calculated by the
relay. The Undervoltage (27) and Directional Power
(32) Functions can not be utilized with this connection.
Alternate Single-phase Two-wire
An alternate single-phase two-wire connection is
shown in Figure 2-14. If the Directional Power (32)
Function and Undervoltage (27) Function are required
by the application, this connection must be used.
With this connection, the Directional Power (32)
Function can be set with no adjustment required.
The power displayed on the Primary Status
Monitoring Screen will be 3 times the actual kVA
and the Secondary Status Monitoring Screen will
display 1 PU of the three-phase base power
calculated by the relay.
M-3810A IPScom
®
for Windows™
Communications Software
IPScom for Windows is shipped standard with every
M-3410A relay. This software runs on a PC-
compatible computer operating under Windows
™
95/98, NT or higher. When properly connected using
either direct serial connection or modem, IPScom
can provide the following functions:
•
Real time monitoring of measured
parameters
•
Interrogation and modification of setpoints
•
Line status real-time monitoring
•
Recorded oscillograph data downloading
•
This data can be analyzed using the
M-3801D IPSplot
®
PLUS Oscillograph
Analysis Software package or a third-
party viewing software employing the
COMTRADE format
M-3811A IPScom for Palm OS
Communications Software
IPScom for Palm OS Communications Software
(Palm OS 3.X and above), when resident on either
a Handspring™ Visor™ or Palm Handheld, provides
a portable human-machine interface (HMI) to the
M-3410A Relay. IPScom for Palm OS includes all
major IPScom features to support local HMI
functions, with the exception of calibration and
partial diagnostics (See Chapter 4,
Operation
).
IPScom for Palm OS is shipped standard with
every M-3410A relay.
1.3
Accessories
M-3933/M-0423 Serial Communication Cables
The M-3933 cable is a 10-foot RS-232 cable for use
between the relay’s rear panel (COM2) port and a
modem. This cable has a DB25 (25-pin) connector
(modem) and a DB9 (9-pin) at the relay end.
The M-0423 cable is a 10-foot null-modem RS-232
cable for direct connection between a PC and the
relay’s front panel COM1 port, or the rear COM2 port.
This cable has a DB9 (9-pin) connector at each end.
M-3801D IPSplot
®
PLUS
Oscillograph Analysis
Software Package
The IPSplot
PLUS
Oscillograph Analysis Software
runs in conjunction with the IPScom
®
software
package on any IBM PC-compatible computer,
enabling the plotting, printing, and analysis of
waveform data downloaded from the M-3410A
Intertie/Generator Protection Relay.
Summary of Contents for Syncrocloser M-3410A
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