Siemens Reyrolle 7SR5 - 10.32 87 T‑BD Transformer Differential Protection - Biased

87T‑BD Transformer Differential Protection – Biased
Common Settings
Reference
Parameter Value
ICTn Mult Winding n ICT multiplier setting 0.25 to 3x, Δ 0.01
ICTn Conn Winding n CT winding connections setting See 5.22 87T Transformer Differential
Protection
ICT Mult
set
Applied ICT multiplier settings (for operate
time)
W 1/2/3 = 1x
ICT Conn
set
Applied ICT connection settings (for
operate time)
W 1/2/3 = YY
Transformer Differential Protection - Biased
Reference
Parameter Value
I
init
Setting 0.1 to 2
p.u.
, Δ 0.05
p.u.
S1 Bias slope 1 0.1x to 0.7x, Δ 0.05
S1L Bias slope 1 limit 1 to 20 ⋅ I
rated
, Δ 0.5
S2 Bias slope 2 1x to 2x, Δ 0.05
I Applied current (for operate time) 0 to 3 ⋅ I
op
(switched)
DTL Delay setting 0 to 1 s, Δ 0.005 s
Operate and Reset Level
Attribute
Value
I
op
Operate level I
BIAS
0 to 1
p.u.
: I
op
> I
init
I
BIAS
1
p.u.
to S1L: I
op
> S1(I
BIAS
- 1) + I
init
I
BIAS
> S1L: I
op
> S2 (I
BIAS
- S1L) + S1(S1L - 1)
+ I
init
Operate level ± 10 % of I
op
or ± 0.1
pu
Reset level ≥ 90 % of I
op
Repeatability ± 2 %
Transient overreach ≤ 5 %
Variation IEC
60255-1
-10 °C to +55 °C ≤ 5 %
f
rated
± 5 % ≤ 5 %
Operate Time
Attribute
Value
t
basic
Element basic operate time (Inrush action:
Enabled)
3 ⋅ I
op
, < 30 ms
t
op
Operate time following delay t
basic
+ DTL, ± 1 % or ± 10 ms
10.32
10.32.1
10.32.2
Technical Data
10.32 87T‑BD Transformer Differential Protection – Biased
Reyrolle 7SR5, Transformer Protection Device, Device Manual 499
C53000-G7040-C015-1, Edition 11.2019