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this current level. Repeat the test with the reset time (b) reduced to 50 % of the previous value. Ensure that
the second operate time (c) is 50 % of the first (a) operate time.
Operate Time
(expected)
50SOTF Switch Onto Fault
9.9.16
Switch Onto Fault elements are only active for the duration of the circuit‑breaker close pulse and reclaim
time following Manual Close of the circuit‑breaker. For testing purposes it is necessary to initiate a Manual
Close operation with the circuit‑breaker in an open state. It is not necessary for the CB Close to actually
complete so the close signal can be blocked externally for testing purposes. CB Fail to Close will raise
Lockout which will need to be reset between tests.
Definite Time Overcurrent (50SOTF)
Initiate a Manual Close operation with the CB in an open state.
Apply 0.9 times setting, check for no operation.
Reset the resulting Lockout state.
Repeat with apply 1.1 times setting, check operation.
Repeat with 2 times setting current if possible and record operating time.
Definite Time Measured Earth Fault (50GSOTF)
Initiate a Manual Close operation with the CB in an open state.
Apply 0.9 times setting, check for no operation.
Reset the resulting Lockout state.
Repeat with apply 1.1 times setting, check operation.
Repeat with 2 times setting current if possible and record operating time.
Phase
CT1(I
)
A
CT2(I
)
B
CT3(I
)
C
CT4
Check correct indication, trip output, alarm contacts, waveform record.
51CL Cold Load Overcurrent – Phase
9.9.17
The CB must be open for more than the Cold Load Pick-up Time to allow testing of this function. It may
be convenient to reduce this setting to suit the test procedure. If the CB is open throughout the tests, the
Cold Load protection settings can be tested provided that the current is not allowed to fall below the level
of the Reduced Current Level for more than the Reduced Current Time during testing. It may be
convenient to set the Reduced Current setting to Disabled for the duration of the test. The Cold Load
Active output is provided and can be used as an indication during testing.
Ensure that the Cold Load active is not raised. This can be reset by CB Closed for more than the Cold
Load Drop-off Time or current less than the Reduced Current Level for greater than the Reduced
Current Time. Check the Cold Load Pick-up Delay by applying or simulating CB Open. Measure the
time delay before Cold Load Active is raised. Apply current above the Reduced Current Level if this
functionality is Enabled before applying CB Closed. Measure the time for Cold Load Active to reset.
Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
Reset Time
Operate Time
(calculated)
(measured)
First test (c)
I
(Amps)
DTL (sec)
set
50 % Reset Time
50 % Operate
(calculated)
Time (calcu-
lated)
P.U. Current
Tolerence
Amps
Functional Tests
9.9 Protection Functional Tests
50 % Operate
Time (meas-
ured)
Second Test (c)
Op. Time 2 ⋅
Tolerance
I
set
485
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