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MTA
Forward
Reverse
Lag (point C)
Lead (point A)
Lead (point B)
Lag (point D)
Pick-up
Drop-off
Pick-up
Drop-off
Pick-up
Drop-off
Pick-up
Drop-off
MTA -85
MTA +85
MTA -85
MTA -85
Calculated
EF
Definite Time Overcurrent (50N)
If DTL setting is small, gradually increase current until element operates.
If DTL is large apply 0.9 times setting, check for no operation, apply 1.1 times setting, check operation.
Apply 2 times 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.
I
set
(Amps)
DTL (sec)
P.U. Current
Amps
Op. Time 2 ⋅
I
set
Notes
N
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 3P 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.
Inverse Time Overcurrent (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
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 9-6
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
N
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.
Functional Tests
9.10 Protection Functional Tests
436
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Содержание Reyrolle 7SR5
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