Overexcitation Protection; Common Settings; Definite Time Element (24Dt); Inverse Time Element (24It) - Siemens Reyrolle 7SR5 Manual

10.3

24 Overexcitation Protection

Common Settings

10.3.1
Reference

Definite Time Element (24DT)

10.3.2
Reference
V/f
set
V/f
t
delay
Operate and Reset Level
V/f
op
Operate and Reset Time
t
basic
t
op

Inverse Time Element (24IT)

10.3.3
Reference
t
reset
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
Parameter
Input selection
Parameter
Setting
Applied overexcitation (for operate time)
Delay setting
Attribute
Operate level
Reset level
Repeatability
Variation IEC -10 °C to +55 °C
60255-1
f
rated
Attribute
Element basic operate time
Operate time following delay
Repeatability
Disengaging time
Parameter
Reset setting
Value
Value
0.10 to 2 ⋅ V
0.9 to 1.1 V/f
0.9 to 2 V/f
0 to 20 s, Δ 0.01 s
20 to 100 s, Δ 0.1 s
100 to 1000 s, Δ 1 s
1000 to 10000 s, Δ 10 s
1000 to 14400 s, Δ 100 s
Value
100 % ⋅ V/f
≥ 97 % of V/f
± 1 %
≤ 5 %
± 5 % ≤ 5 %
Value
1.1 ⋅ V/f
set
2 ⋅ V/f : 320 ms ± 200 ms
set
t + t
basic delay
± 1 %
< 250 ms
Value
0 to 1000 s, Δ 1 s
Technical Data
10.3 24 Overexcitation Protection
/f
rated rated
set
set
: ± 2 % or ± 0.02
set
op
: 400 ms ± 200 ms
± 1 % or ± 200 ms
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