Inverse Time Overcurrent (51C); Ansi Reset - Siemens 7SR18 Solkor Manual

3.4.1
I T O
NVERSE IME
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 Pick-up led to operate for the function.
Gradually increase current until Pickup LED operates.
Apply 2x setting current and record operating time,
Apply 5x setting current and record operating time.
Compare to calculated values for operating times
Ph. Dir
(NI EI VI LTI,
P.U.
I (I )
L1 A
D.O.
I (I )
&
L2 B
TIMING
I (I )
L3 C
TESTS
Calculated Timing values in seconds for TM =1.0
Curve
IEC-NI
IEC-VI
IEC-EI
IEC-LTI
ANSI-MI
ANSI-VI
ANSI-EI
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.
3.4.2
ANSI R
ESET
If the element is configured as an ANSI characteristic, it may have a reset delay applied. If ANSI reset is selected
for an IEC characteristic element, the reset will be instantaneous.
ANSI reset times from operated condition to fully reset are as follows for zero applied current and TM = 1.0. The
reset curve characteristic type and TM is defined by the operating characteristic.
Curve
ANSI-MI
ANSI-VI
ANSI-EI
Apply current in the following sequence, a) 2x setting for a time to ensure element operation, b) Zero current for
the reset time above (xTM), c) 2x setting for a time to ensure element operation. Check that the second operation
(c) is similar to the first (a) and in line with the expected operate time for the element at 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 Reset time
time (calculated)
(expected)
Check correct indication, trip output, alarm contacts, waveform record.
Unrestricted ©2018 Siemens Protection Devices Limited
(51C)
VERCURRENT
Char. Is TM Operate Current
(A)
P.U.
DTL)
(A)
2 xIs
10.03
13.50
26.67
120.00
3.80
7.03
9.52
Fully operated to reset with Zero current applied & TM=1 (seconds)
Operate time 50 % Reset
(measured) Time
(calculated)
First test (c)
7SR18 Commissioning & Maintenance Guide
Operate Time
D.O. Tol 2 x Is 5 x Is
(A) (s) (s)
5 xIs
4.28
3.38
3.33
30.00
1.69
1.31
1.30
4.85
21.6
29.1
50 % operate 50 % Operate time
time
(calculated)
Second Test (c)
Tol
(measured)
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