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)
Reset Time
(calculated)
Operate Time
(measured)
50 % Reset Time
(calculated)
50 % Operate
Time (calcu-
lated)
50 % Operate
Time (meas-
ured)
First test (c)
Second Test (c)
51CL Cold Load Overcurrent – Phase
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.
It will be advantageous to map the function being tested to temporarily drive the relevant pickup output in the
Pickup Config
sub-menu in the
Output Config
menu as this will allow the
Pickup
LED to operate for
the function.
Gradually increase current until
Pickup
LED operates.
Apply 2 times setting current and record operating time.
Apply 5 times setting current and record operating time.
Compare to calculated values for operating times.
Table 9-7
P.U. D.O. & Timing Tests
Ph.
Dir
Char.
(NI EI VI
LTI,
DTL)
I
set
(A)
Tm
Operate Current
Operate Time
P.U.
(Amps)
D.O.
(Amps)
Tol
2 ⋅ I
set
(sec)
5 ⋅ I
set
(sec)
Tol
CT1(I
A
)
CT2(I
B
)
CT3(I
C
)
Calculated timing values in seconds for Tm = 1.0
Curve
2 ⋅ I
set
5 ⋅ I
set
IEC-NI
10.03
4.28
IEC-VI
13.5
3.38
IEC-EI
26.67
3.33
IEC-LTI
120
30
ANSI-MI
3.8
1.69
ANSI-VI
7.03
1.31
ANSI-EI
9.52
1.3
Note that the operate time may be subject to the
Minimum Op Time
setting for the element and/or may
have a
Follower DTL
applied.
9.10.14
Functional Tests
9.10 Protection Functional Tests
438
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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