ABB Relion RES670 Product Manual page 50

Phasor measurement unit RES670 2.1 IEC
Table 30. Thermal overload protection, one time constant LCPTTR/LFPTTR
Function
Reference current
Reference temperature
Operate time:


2 , 2
I I

σ
< p
t ln
 ,
T T
2 , Trip Amb √
I

 T
ref
EQUATION13000039 V3 EN-US
T = set operate temperature
Trip
T = ambient temperature
Amb
T = temperature rise above ambient at I
ref
I = reference load current
ref
I = actual measured current
I = load current before overload occurs
p
Alarm temperature
Operate temperature
Reset level temperature
Table 31. Directional underpower protection GUPPDUP
Function
Power level
for Step 1 and Step 2
Characteristic angle
for Step 1 and Step 2
Independent time delay to operate for Step
1 and Step 2 at 2 to 0.5 x S
r
50
Range or value
(2-400)% of IBase
(0-300)°C, (0 - 600)°F
Time constant t = (1–1000)
minutes




2
I

ref

(Equation 1)
ref
(0-200)°C, (0-400)°F
(0-300)°C, (0-600)°F
(0-300)°C, (0-600)°F
Range or value
(0.0–500.0)% of
(-180.0–180.0) degrees
(0.01-6000.00) s
and k = 0.000
M12352-1 v15
Accuracy
±1.0% of I
±1.0°C, ±2.0°F
IEC 60255-149, ±5.0% or ±200 ms whichever is greater
±2.0°C, ±4.0°F
±2.0°C, ±4.0°F
±2.0°C, ±4.0°F
SEMOD175152-2 v10
SBase
1MRK 511 367-BEN D
r
Accuracy
±1.0% of S at S ≤ S
r r
±1.0% of S at S > S
r
where
= × ×
S 1.732 U I
r r r
±2.0 degrees
±0.2% or ±40 ms whichever is greater
ABB