D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 617
D90
Plus
Line Distance Protection System
Chapter 14: Testing
Testi ng
This section outlines the D90
Plus
testing features.
Test mode
The D90
Plus
provides test settings to verify functionality using simulated conditions for
contact inputs and outputs. To initiate test mode, the
Test Mode Function setting must be
“Enabled” and the operand assigned to the
Test Mode Initiate setting must be set to logic 1.
Specifically, test mode is initiated as follows:
• To initiate test mode through the D90
Plus
settings, set the Test Mode Initiate to “ON,”
then start test mode by “Enabling” the
Test Mode Function setting.
• To initiate test mode through a user-programmable condition, such as FlexLogic
operand, set the
Test Mode Function setting to “Enabled” and the Test Mode Initiate to
the desired operand. The test mode starts when the selected operand assumes a logic
1 state.
When in test mode, the D90
Plus
remains fully operational, allowing for various testing
procedures. The only difference between normal operation and test mode is the behavior
of the input and output contacts. The former can be forced to report as open or closed or
remain fully operational; the latter can be forced to open, close, freeze, or remain fully
operational. The response of the digital input and output contacts to the test mode is
programmed individually for each input and output using the force contact inputs and
force contact outputs test functions described in the following sections.
Force contact inputs
The force contact inputs feature provides a method to perform checks on the function of
all contact inputs. Once enabled, the D90
Plus
is placed into test mode, allowing this feature
to override the normal function of contact inputs. All contact input operations return to
normal when all settings for this feature are disabled.
Select the Settings > Testing > Force Contact Inputs menu to open the force contact
inputs configuration window.
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