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1
Introduction
Figure 1.1 ISGS Relay
1.2
General Description
The ISGS relay is a general purpose, multifunction, micro
processor-based protective relay. In its standard configura
tion, the relay performs protection, metering, and monitoring
for three phase CT inputs and one ground CT input, and
provides two breaker tripping contacts, plus one relay dis
abled (alarm) contact. The relay disabled contact is a nor
mally closed contact which remains open when the relay is
functioning properly. The standard protection features are:
instantaneous and time phase overcurrent, and instanta
neous and time ground overcurrent. The standard metering
features are: phase and neutral currents, average current,
amps demand and min/max logs. The standard monitoring
features include logging of: interrupted current on a per-pole
basis, a counter for number of breaker operations, and indi
cation of breaker position. For DC trip systems, trip source
integrity and coil condition are also monitored.
The ISGS relay includes a 2 line by 16 character liquid crys
tal display (LCD) for viewing measured data and a 28 button
keypad for local access to the data. The keypad also allows
the operator to change various parameters and control relay
functions. General relay status information is provided by the
front panel LED indicators. Password security prevents
unintentional changes to the relay parameters. An RS-232
communications port is provided on the front panel for local
parameter setup and control via a personal computer.
The ISGS relay is supplied in an M1-size drawout case with
dust tight front cover. The case is compatible with XLA con
necting plugs that are commonly used to test relays.
1.3
Options
The ISGS relay is a dynamic, feature-rich device that can be
used in numerous industrial and utility applications. Available
options
include
voltage
functions,
and an RS-485 communications port (using
SEAbus™ protocol).
2
inputs,
extended
protective
1.3.1
Voltage Inputs
Installation of the optional voltage input card provides three
inputs for the connection of 115 V or 120 V rated VTs. These
inputs extend the metering and protection capabilities as
follows:
1.
Enhanced metering capabilities: kW, kVAR, kVA, PF,
kW Demand, kWHR, kVARHR
Directional overcurrent protection (67 & 67N)
2.
3.
Over and under voltage protection (59/27)
4.
Voltage phase sequence protection (47)
1.3.2
SEA bus Communication Interface
Installation of the SEAbus Communication option card adds
an RS-485 communication interface on the rear panel for
connection to remote monitoring and control systems.
This feature is compatible with the Siemens ACCESS™
System as well as WinPM™ power monitoring and control
software, SIEServe™ software, and Wisdom software. This
feature allows configuration, measurement, and protection
functions to be performed or reviewed from a remote loca
tion.
1.4
ISGS Wisdom Software
While it is possible to completely set up and configure the
ISGS relay using the keyboard and display on the front
panel, this task can also be accomplished remotely through
either of the two communication ports (front or rear)
described earlier. The available tool for this purpose is the
ISGS Wisdom software package provided with the relay.
In addition to setup and configuration, Wisdom software
can also retrieve and display fault data stored in the relay.
This includes the trip logs and the waveform capture buffers.
Wisdom software can also display real-time relay status and
metering data.
Installation and use of the Wisdom program is extremely
simple and straight forward. The program runs on a stan
dard IBM™ compatible, personal computer under the Win
dows ™ operating system. An extensive context -sensitive
Help function is included. For anyone who might wish to
evaluate the software off-line, a demonstration mode is pro
VIded that allows all of the program functions to be exer
cised
without
actual
connection
Information on the methods and equipment required to con
nect the personal computer to the relay are included in the
Help function.
In addition to allowing experimentation, the "demo" mode
permits the user to create relay configuration files that can
be saved and used at a later time to configure an actual
relay.
Please refer to the data sheet provided with the software
package for further details.
Siemens Energy & Automation, Inc.
to
an
ISGS
relay.
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