Setting Changes - GE LPS-O Instruction Manual

4 ACCEPTANCE/PERIODIC TESTS
In tests that cause tripping, the trip target type may not match the unit being tested in the procedure. For
example, if a Zone 1 phase fault is being tested, Zone 2 may pick up and trip the relay before the fault is in
the Zone 1 characteristic. The target information will reflect the Zone 2 trip, not Zone 1. Keep this in mind
during the tests.
Use a continuity tester with high input impedance, such as a digital ohmmeter, to monitor the A1 contact
during relay testing.
NOTE: Tripping contacts will operate while the relay is in test mode unless the outputs are disabled.
2. Where appropriate, current levels are defined with two numbers as xx(yy) ; xx is the value to be used for
relays rated at 5 Amperes and ( yy ) is the value to be used for 1 Ampere relays.
3. One or more of the electronic current sources may not be used during a test. If the source is not used, it
must be set to zero, in addition to being disabled. Also, the currents should always be set at or near zero
whenever a current source is powered on or off.
4. The phase angles of the test sources are shown relative to phase A voltage. A positive phase angle indi-
cates the referenced quantity is leading phase A voltage. A negative phase angle indicates the referenced
quantity is lagging phase A voltage.
5. All test voltages are phase-to-ground measurements unless otherwise specified.
6. Entries at the keypad are shown as [ KEY ], with the label of the key to be pressed enclosed in square
brackets. For tests that require a setting change, the setting number is shown in parentheses next to the
setting. This is performed by pressing the [SET] key, choosing the setting type (Protection or General), the
group (if necessary), the setting number ( nnnn ), and [ENT]. The new setting may then be entered.
NOTE : Operation of Potential Transformer Fuse Failure (PTFF) will cause the Critical Alarm to
operate.
7. When testing the relay using the LPSO-Link software, the only time that information will automatically
appear on the display is after the relay has tripped or to report a detected error. Relay status and test mode
information will not appear.
8. At the end of testing, make sure that all settings are returned to their initial values. This can be done
through LPSO-Link by uploading the settings to the PC before testing begins and then downloading them
back to the relay when testing has been completed. If a PC is not available, scroll through all settings using
the keypad and verify each one with the setting recorded in Table 2–9: PROTECTION SETTINGS DATA
SHEET on page 2–47.
Setting changes required for a particular test are listed before the test. A sample setting change is shown
below. Refer to Chapter 8: LOCAL USER INTERFACE for further details on making setting changes.
EXAMPLE SETTING CHANGE:
This example illustrates changing the reach of the Zone 1 Phase Unit to 5.6 Ohms.
1. Apply rated DC and wait for relay initialization to complete, indicated by a solid green status LED on the
front of the relay.
2. Press the [SET] key:
ENTER PASSWORD:
is displayed.
Enter the Master or Settings level password and press the [ENT] key.
GE Power Management LPS-O Line Protection System
4.1 OVERVIEW

4.1.7 SETTING CHANGES

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