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Section 10
Testing functionality by secondary injection
At mode 2 out of 4 the phase current setting, IP> can be checked by single-phase injection where the
return current is connected to the summated current input. The value of residual (earth fault) current
IN set lower than IN> is easiest checked in back-up trip mode 1 out of 4.
10.4.6.1
Function revision history
Document
revision
A
B
C
D
E
F
G
H
10.4.6.2
Checking the phase current operate value, IP>
BuTripMode = 1 out of 3 or 2 out of 4.
1.
Apply the fault condition, including START of CCRBRF, with a current below the set IP>.
2.
Repeat the fault condition and increase the current in steps until a trip occurs. Note that the
START signal shall be re-applied for each new current value.
3.
Compare the result with the set IP>.
10.4.6.3
Checking the residual (earth fault) current operate value IN> set below IP>
Check the low set IN> current where setting FunctionMode = Current and setting BuTripMode = 1 out
of 4
1.
Apply the fault condition, including START of CCRBRF, with a current just below set IN>.
2.
Repeat the fault condition and increase the current in steps until trip appears. Note that the
START signal shall be re-applied for each new current value.
3.
Compare the result with the set IN>.
4.
Disconnect AC and START input signals.
10.4.6.4
Checking the re-trip and back-up times
The check of the set times can be made in connection with the check of operate values above.
Choose the applicable function and trip mode, such as FunctionMode = Current and RetripMode =
UseFunctionMode.
84
Product
History
revision
2.2.1
I>BlkCBPos setting functionality correction.
2.2.1
-
2.2.2
-
2.2.3
Setting StartMode is added to choose how retrip and backup trip timers are run. The
choices are; to run the timers by external start signal which is latched, to follow the
external start signal only or to follow the external start signal and the selected
FunctionMode.
2.2.3
-
2.2.4
-
2.2.4
-
2.2.5
-
If RetripMode = Off and FunctionMode = Current is set, only backup trip can be used
to check set IP>.
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Busbar protection REB670
Commissioning manual
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