Siemens ISGS SG8158-00 - Manual (Page 9)

Introduction
Siemens Energy & Automation, Inc. 3
1.3.2 Optional Configurations
The ISGS relay is a dynamic, feature-rich device that can be
used in numerous industrial and utility applications. It allows
the addition of options or configuration changes at any time
without discarding the basic hardware.
There are four optional configurations that can be added to
the ISGS relay base unit.
Metering
Adding metering to the ISGS relay provides the relay with
three inputs for the connection of VTs. Each input can be set
from 100 V to 120 V. These inputs extend metering capabili-
ties as follows:
• Rms and average rms voltages
• Active and apparent power
• Kilowatt demand and kilowatt demand hours
• Power factor
• Frequency
The installation of the voltage input card now also allows the
setting of these protective functions:
• High-Set Instantaneous Phase Overcurrent (50HS)
• High-Set Instantaneous Neutral or Ground Overcurrent
(50HSN)
The metering option is also a prerequisite for the next two
options: additional protective functions and remote commu-
nications.
Additional Protective Functions
For an ISGS relay with the metering option installed, the fol-
lowing additional protective functions offer a powerful exten-
sion of its protection capabilities:
• Under/Overvoltage (27/59)
• Phase Sequence Voltage (47)
• Negative Sequence Voltage (47N)
• Directional Time Overcurrent (67/67N)
• Over/Underfrequency (81U/O)
Communications
Adding communications to the ISGS relay provides the relay
with an RS-485 port. Using the SEAbus™ communications
protocol, this port allows remote communications and con-
trol via the ACCESS™ electrical distribution and communica-
tion system (ACCESS system).
Communications allows configuration, measurement, and
protection functions to be performed or reviewed easily from
a remote location using Wisdom software.
1.4 Wisdom Software
While it is possible to completely set up and configure the
ISGS relay using the front panel keyboard and display, the
free Wisdom software package provided with the relay
reduces the complexity of configuring the relay, reading
metered values, and retrieving stored data. For more infor-
mation on Wisdom software, refer to Chapter 8.
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