General Instructions; Procedure; Setting Changes - GE DGP Series Instruction Manual

4 ACCEPTANCE TESTS

4.3 GENERAL INSTRUCTIONS

1. To remove power from the relay, remove at least one of the connection plugs. For models without connec-
tion plugs, turn both DC Control switches to the OFF position.
2. The DGP tests are performed in the "test mode" of operation. The test mode selects and isolates various
test functions and measuring units and routes their status to the output Test Pickup and Test Trip (DOR12
and DOR13) contacts. When the particular function under test has picked up, DOR12 (AF6—AG6) will
operate. When the particular function under test has tripped, DOR13 (AF5—AG5) will operate.
For the remainder of this test, DOR12 will be referred to as "test pickup" and DOR13 as "test trip".
The Digital Output contacts will chatter when the unit under test is near its threshold. DO
NOT let it continue. Remove the test signal. A single contact closure is enough to deter-
mine that the unit picked up.
CAUTION
SELECTED TRIP AND ALARM CONTACTS WILL ALSO OPERATE IN THE TEST MODE.
NOTE
3. The trip-time settings listed in these tests do not include the 4 to 5 ms required for the output relay to oper-
ate. For very short trip times, this may become significant.
4. During the test, one or more of the electronic current sources may not be used. If the source is not used, it
must be set to zero (0) in addition to being disabled. Also, the currents should always be set at or near zero
(0) whenever a current source is powered ON or OFF.
5. The phase angles of the test sources are shown relative to phase A voltage. A positive (+) phase angle
refers to the referenced quantity leading phase A voltage. A negative (–) phase angle refers to the refer-
enced quantity lagging phase A voltage.
6. All test voltages are phase-to-ground measurements unless otherwise specified.
7. Typing an entry on the MMI keypad will be shown as [ KEY ] where KEY represents the alphanumeric label
of the key to be pressed.
For tests that require a setting change, the setting number will be shown in parentheses next to the setting,
to facilitate direct access to the setting. This is performed by pressing the [SET] key, entering the four-digit
the setting number ( nnnn ), then pressing the [ENT] key. The new setting may then be entered.
At the end of testing, ensure that all settings are returned to initial values. Print them out and verify them
before placing the relay in service. If a printer is not available, scroll through all settings with the MMI dis-
play and verify each one individually.
Setting changes required for a particular test will be listed before the test. A sample Setting change is shown
below. Refer to Chapter 8: INTERFACE for further details on making Setting changes.
Example for changing the set point of the Underfrequency Unit #1 to 62.00 Hz.
1. Apply rated DC and wait for relay initialization to complete, as indicated by the green LED on the MMI.
2. Press the [ACT] key. Scroll with the arrow key until ACT: ENTER PASSWORD is displayed, then press the
[ENT] key.
If this is the first time the Settings Level functions are used, the password has the factory value "1234.".
The decimal point is a character that can only be entered at the factory. This password must be changed
before any Setting functions can be accessed. See Section 8.3.9: ACTIONS KEY [ACT] on page 8–7 for
information on how to change the password.
GE Power Management DGP Digital Generator Protection System
4.3 GENERAL INSTRUCTIONS

4.3.1 PROCEDURE

4.3.2 SETTING CHANGES

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