5-202 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
TESTING CHAPTER 5: SETTINGS
5
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
TEST MODE
FUNCTION
setting can only be changed by a direct user command. Following a restart, power up, settings upload, or
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.
5.9.2 Test mode forcing
SETTINGS TESTING TEST MODE FORCING
When in Forcible mode, the operand selected by the
TEST MODE FORCING setting dictates further response of the B90 to
testing conditions, as described in the following two sections.
The test mode state is indicated on the relay front panel 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 5-31: Test mode operation
5.9.3 Force contact inputs
SETTINGS TESTING FORCE CONTACT INPUTS
The force contact inputs feature provides a method of performing checks on the function of all contact inputs.
While in Forcible test mode, the relay contact inputs can be pre-programmed to respond in the following ways:
• If set to “Normal,” the input remains fully operational. It is controlled by the voltage across its input terminals and can
be turned on and off by external circuitry. Select this value if a given input must be operational during the test. This
includes, for example, an input initiating the test, or being a part of a user pre-programmed test sequence.
TESTING
TEST MODE FORCING:
On
Range: FlexLogic operand
TEST MODE
FUNCTION
In-service
LED
Test mode
LED
Critical fail
relay
TEST MODE
FORCING
Contact input and output behavior
Disabled Unaffected Off Normal No effect Normal
Isolated Off On De-energized No effect Contact outputs disabled
Forcible Off Flashing De-energized Off Normal
On Controlled by forcing features
On restart, the TEST MODE FORCING setting and the force contact input and force contact output settings revert to
their default states.
FORCE CONTACT
INPUTS
FORCE Cont Ip 1
:Normal
Range: Normal, Open, Closed
FORCE Cont Ip 2
:Normal
Range: Normal, Open, Closed
FORCE Cont Ip xx
:Normal
Range: Normal, Open, Closed
To Next Page
Loading...
Need help?
General
