Woodward highprotec MRI4, User Manual

Page: 502 / 727

Protective Elements
Commissioning: Switch Onto Fault
Object to be tested
Testing the module
Switch Onto Fault according to the parameterized operating mode
:
The breaker state (CB Pos);
No current flowing (I<);
Breaker state and no current flowing( CB Pos and I<);
Breaker switched on manually (CB manually On); and/or
An external trigger (Ex SOTF).
Necessary means:
Three-phase current source (If the Enable-Mode depends on current);
Ampere meters (May be needed if the Enable-Mode depends on current); and
Timer.
Test Example for Mode CB manual ON
Mode I<: In order to test the effectiveness: Initially do not feed any current.
Start the timer and feed with an abrupt change current that is distinctly
greater than the I<-threshold to the measuring inputs of the relay.
Mode I< and Bkr state: Simultaneous switch on the breaker manually and
feed with an abrupt change current that is distinctly greater than the
I<-threshold.
Mode Bkr state: The breaker has to be in the OFF Position. The signal
„SOTF.
ENABLED
“=0 is untrue. If the breaker is switched on, the signal
„SOTF
.
ENABLED
“=1 becomes true as long as the timer t-enabled is running.
The Circuit Breaker has to be in the OFF Position. There must be no load current.
The Status Display of the device shows the signal „SOTF.E
NABLED
“=1.
Testing
Switch the Circuit Breaker manually ON and start the timer at the same time.
After the hold time t-enable is expired the state of the signal has to change to „SOTF.E
NABLED
“=0.
Write down the measured time.
Successful test result
The measured total tripping delays or individual tripping delays, threshold values and fallback ratios correspond with
those values, specified in the adjustment list. Permissible deviations/tolerances can be found under Technical Data.
502 MRI4 DOK-HB-MRI4-2E