Siemens Reyrolle 7SR54 - HS Transformer Differential Protection - Highset; Common Settings; Transformer Differential Protection - Highset

87T‑HS Transformer Differential Protection – Highset
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 - Highset
Reference
Parameter Value
I
set
Differential current setting 1 to 30 ⋅ I
rated
, Δ 1 ⋅I
rated
I Applied current (for operate time) 0 to 1.5 ⋅ I
op
(switched)
t
delay
Delay setting 0 to 1 s, Δ 0.005 s
Operate and Reset Level
Attribute
Value
I
op
Operate level ± 10 % of I
set
or ± 0.1 I
rated
Reset level ≥ 90 % of I
op
Repeatability ± 2 %
Transient overreach ≤ 5 %
Variation IEC
60255-1
-10 °C to +55 °C
f
rated
± 5 %
Operate Time
Attribute
Value
t
basic
Element basic operate time 1.5 ⋅ I
op
: < 25 ms
t
op
Operate time following delay t
basic
+ t
delay
± 1 % or ± 10 ms
10.33
10.33.1
10.33.2
Technical Data
10.33 87T‑HS Transformer Differential Protection – Highset
500 Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019