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LPS-O Line Protection System GE Power Management
2.1 INTRODUCTION 2 CALCULATION OF SETTINGS
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All of the settings used in the LPS-O system are listed in Table 2–1: TRIPPING SCHEMES on page 2–4.
These tables also show setting ranges for 5 Amp and 1 Amp rated systems. Note that each specific setting in a
subgroup has a distinctly assigned number in addition to a unique mnemonic. These identification numbers
can be used to facilitate entering or changing a setting via the keypad or the LPSO-Link communications pro-
gram provided with the relay.
NOTE: All settings must be entered in secondary values (ohms, amperes, volts) unless per unit (p.u.)
or other values are called for.
This section is used to determine and calculate the settings for a particular application. Go through this section,
setting by setting, and manually record each setting in the blank forms provided (see Section 2.5.4: PROTEC-
TION SETTINGS DATA SHEET on page 2–47 and Section 2.5.5: GENERAL SETTINGS DATA SHEET on
page 2–54). Once the form is completed, enter the settings individually via the keypad located on the front of
the LPS-O system or through the ASCII communications port (a long and laborious process and not recom-
mended). Alternatively, use the LPSO-Link communications program to access and modify an existing settings
file (a sample settings file is included with the LPS-O software). This file can then be downloaded to the LPS-O
system and saved for possible modification in the future.
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