T Ext S Etpoints - GE 745 Instruction Manual

CHAPTER 1: GETTING STARTED
1.3.4 Enumeration Setpoints
1.3.5 Text Setpoints
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
As an example, let's set the nominal VT secondary voltage setpoint to 69.3 V. Press the
appropriate numeric keys in the sequence '6 9 . 3'. The display message will change as
the digits are being entered.
NOMINAL VT SECONDARY
VOLTAGE: 69.3 V
Editing changes are not registered until the ENTER key is pressed. Press the ENTER key to
store the new value in memory. This flash message momentarily appears to confirmation
the storing process. If 69.28 were entered, the value is automatically rounded to 69.3, since
the step value for this setpoint is 0.1.
NEW SETPOINT HAS
BEEN STORED
Enumeration setpoints have data values which are part of a set, whose members are
explicitly defined by a name. A set is comprised of two or more members.
Enumeration type values are changed using the VALUE keys. The VALUE UP key displays
the next selection while the VALUE DOWN key displays the previous selection. As an
example we may need to set the phase sequence to ACB. Press the VALUE keys until the
proper selection is displayed.
PHASE SEQUENCE:
ACB
Editing changes are not registered until ENTER is pressed, storing the new value in
memory. This flash message momentarily appears to confirm the storing process.
NEW SETPOINT HAS
BEEN STORED
Text setpoints have data values which are fixed in length, but user defined in character.
They may be comprised of upper case letters, lower case letters, numerals, and a selection
of special characters.
The editing and storing of a text value is accomplished with the use of the decimal, ENTER,
VALUE, and ESCAPE keys. For example:
1. The name for output relay 3 should be more descriptive than the default value. For this
example let us rename output relay as
underscore (_) will appear at the first character position.
OUTPUT 3 NAME:
Trip 3
2. Press VALUE keys until the character "I" is displayed in the first position, then press the
decimal key to store the character and advance the cursor. Change the second
character to a "N" using the VALUE keys and save this change by pressing the decimal
key again. Continue editing all the characters in the text until the string
is entered. Note that a space is selected like a character. If a character is entered
CHANGING SETPOINTS
. Press the decimal key and an
INST DIFF TRIP
INST DIFF TRIP
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