Table 9-5
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
CT4
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.
If VTS action is set to
Block
, this option should be tested. Apply balanced voltage and current. Reduce a-
phase voltage to cause a VTS condition. Increase a-phase current and check that the element does not
operate.
If VTS action is set to Non-Directional, this option should be tested. Apply balanced voltage and current.
Reduce a-phase voltage to cause a VTS condition. Increase a-phase current and check that the element oper-
ates at its normal setting. Reverse the voltage phase direction whilst checking that the element does not reset.
Element Blocking
The
Measured Earth Fault
elements can be blocked by
Binary Input Inhibit
,
VT Supervision
and
Inrush Detector
operation. The characteristic can be made non-directional by
VT Supervision
.
This functionality should be checked.
Element
BI Inhibits
VTS Action
81HBL2 Inhibit
51G-1
51G-2
51G-3
51G-4
50G-1
50G-2
50G-3
50G-4
ANSI Reset
If the element is configured as an ANSI characteristic, it may have an ANSI decaying reset delay applied.
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
Fully Operated to Reset with Zero Current Applied
& Tm = 1 (s)
ANSI-MI
4.85
ANSI-VI
21.6
ANSI-EI
29.1
Functional Tests
9.10 Protection Functional Tests
434
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
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