Test Mode Forcing - GE T60 Instruction Manual

CHAPTER 5: SETTINGS
The Forcible mode is intended for testing involving forcing relay operation by test signal injection and verifying correct
relay output. This mode is also for tests to verify the relay outputs (both contact and communications) have the intended
impact on specific power system devices or on specific other substation automation devices. Contact outputs can be
selectively enabled or forced as described in the following two sections. Shared outputs to bricks have their test mode flag
raised, which results in their value only being accepted by relays also in forcible mode. GOOSE transmissions have the
"simulation" flag set, which results in these only being accepted by other devices that have their "Sim" data attribute set.
The "Sim" data attribute in the relay is set, so that if GOOSE messages are received with the "simulation" flag set, these are
used in place of the normal messages. The quality attribute of values that are output via 61850 MMS services are set to
"valid" + "test," which signals that the values should not be used for operational purposes.
Otherwise, the UR remains fully operational while in the Forcible test mode, allowing for various testing procedures. In
particular, the protection and control elements, and FlexLogic function normally. Other than the IEC 61850 protocol,
communications based inputs and outputs remain fully operational. The test procedure must take this into account. Direct
I/O channel tests and PMU tests are usable on applicable models.
The test mode can be selected either through the front panel, through EnerVista UR Setup, or through IEC 61850 control to
LLN0.Mod. LLN0.Mod.ctlVal "on" selects Disabled, "test/blocked" selects Isolated, and "test" selects Forcible. The
setting can only be changed by a direct user command. Following a restart, power up, settings upload, or
FUNCTION
firmware upgrade, the test mode remains at the last programmed value. This allows a UR that has been placed in isolated
mode to remain isolated during testing and maintenance activities.

5.11.2 Test mode forcing

SETTINGS  TESTING  TEST MODE FORCING
 TESTING

When in Forcible mode, the operand selected by the
testing conditions, as described in the following two sections.
The test mode state is indicated on the relay faceplate by a combination of the Test Mode LED indicator, the In-Service LED
indicator, and by the critical fail relay, as shown in the following table.
Table 5-46: Test mode operation
TEST MODE In-service
FUNCTION LED
Disabled Unaffected
Isolated Off
Forcible Off
On restart, the
TEST MODE FORCING
their default states.
5.11.3 Phasor Measurement Unit test values
SETTINGS  TESTING  PMU TEST VALUES  PMU 1 TEST VALUES
 PMU 1
 TEST VALUES
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
TEST MODE FORCING:

On
TEST MODE FORCING
Test mode Critical fail TEST MODE
LED relay FORCING
Off Normal No effect
On De-energized No effect
Flashing De-energized Off
On
setting and the force contact input and force contact output settings revert to
PMU 1 TEST

FUNCTION: Disabled
PMU 1 VA TEST

MAGNITUDE: 500.00 kV
PMU 1 VA TEST

ANGLE: 0.00°
Range: FlexLogic operand
setting dictates further response of the T60 to
Contact input and output behavior
Normal
Contact outputs disabled
Normal
Controlled by forcing features
Range: Enabled, Disabled
Range: 0.00 to 700.00 kV in steps of 0.01
Range: –180.00 to 180.00° in steps of 0.05
TESTING
TEST MODE
5
5-365