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7SR18 Commissioning & Maintenance Guide
Unrestricted Page 30 of 54
©2018 Siemens Protection Devices Limited
3.5.1
D
EFINITE
T
IME
O
VERCURRENT
(50N)
If DTL setting is small, gradually increase current until element operates.
If DTL is large apply 0.9x setting, check for no operation, apply 1.1x setting, check operation
Apply 2x setting current if possible and record operating time
Check correct indication, trip output, alarm contacts, waveform record.
Note that these elements can be set to directional.
Phase
Dir
Is
(A)
DTL
(s)
P.U. Current
(A)
Operate Time
2 x Is
NOTES
E
3.5.2
I
NVERSE
T
IME
O
VERCURRENT
(51N)
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.
P.U. /
D.O.
&
TIMING
TESTS
Ph.
Dir
Char.
(NI EI VI LTI,
DTL)
Is
(A)
TM
Operate Current
Operate Time
P.U.
(A)
D.O.
(A)
Tol
2 x Is
(s)
5 x Is
(s)
Tol
E
Calculated Timing values in seconds for TM =1.0
Curve
2 xIs
5 xIs
IEC-NI
10.03
4.28
IEC-VI
13.50
3.38
IEC-EI
26.67
3.33
IEC-LTI
120.00
30.00
ANSI-MI
3.80
1.69
ANSI-VI
7.03
1.31
ANSI-EI
9.52
1.30
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.
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