
Introduction
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1.3.2Optional Configurations
The ISGS relay is a dynamic,
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:
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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
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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