ABB Relion 670 Series RES670, Technical Manual

Page: 255 / 888

8.5.8 Technical data
Table 132: LFPTTR/LCPTTR (26)technical data
Function Range or value Accuracy
Reference current (2-400)% of IBase ±1.0% of I
n
Reference temperature (0-600)°F, 0 - 300)°C
±
2.0°F, ±2.0°C
Trip time:
2 2
2 2 2
ln
p
Trip Amb
p ref
ref
I I
t
T T
I I I
T
t
-
=
-
- - ×
é ù
ê ú
ê ú
ê ú
ê ú
ë û
EQUATION13000039 V2 EN
(Equation 27)
T
Trip
= set trip temperature
T
Amb
= ambient temperature
T
ref
= temperature rise above ambient at I
ref
I
ref
= reference load current
I = actual measured current
I
p
= load current before overload occurs
Time constant
t
= (1–1000)
minutes
IEC 60255-149, ±5.0%
or ±200 ms whichever
is greater
Alarm temperature (0-400)°F, (0-200)°C ±4.0°F, ±2.0°C
Trip temperature (0-300)°C, (0-600)°F ±4.0°F, ±2.0°C
Reset level temperature (0-300)°C, (0-600)°F ±4.0°F, ±2.0°C
8.6 Directional underpower protection GUPPDUP (37)
8.6.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Directional underpower protection GUPPDUP
P <
2
SYMBOL-LL V2 EN
37
8.6.2 Functionality
The task of a generator in a power plant is to convert mechanical energy available as a
torque on a rotating shaft to electric energy.
1MRK 511 365-UUS A
Section 8
Current protection
Phasor measurement unit RES670 2.1 ANSI 249
Technical manual