ABB RET620 - 2.3.6 Protection Functions

Table 51. Thermal overload protection, two time constants (T2PTTR)
Characteristic Value
Operation accuracy Depending on the frequency of the current measured: f
n
±2 Hz
Current measurement: ±1.5% of the set value or ±0.002 x I
n
(at
currents in the range of 0.01...4.00 x I
n
)
Operate time accuracy
1)
±2.0% of the theoretical value or ±0.50 s
1) Overload current > 1.2 x Operate level temperature
Table 52. Thermal overload for protection, two time constants (T2PTTR) main settings
Parameter Function Value (Range) Step
Temperature rise T2PTTR
0.0...200.0
o
C
0.1
Max temperature T2PTTR
0.0...200.0
o
C
0.1
Operate temperature T2PTTR 80.0...120.0 % 0.1
Weighting factor p T2PTTR 0.00...1.00 0.01
Short time constant T2PTTR 6...60000 s 1
Current reference T2PTTR 0.05...4.00 x I
n
0.01
Operation T2PTTR Off
On
-
Table 53. Phase undercurrent protection (PHPTUC)
Characteristic
Value
Operation accuracy Depending on the frequency of the current measured: fn ±2 Hz
±1.5% of the set value or ±0.002 x In
Start time Typical <55 ms
Reset time <40 ms
Reset ratio Typical 1.04
Retardation time <35 ms
Operate time accuracy in definite time mode mode ±1.0% of the set value or ±20 ms
Table 54. Phase undercurrent protection (PHPTUC) main settings
Parameter
Function Value (Range) Step
Start value PHPTUC 0.01...1.00 xIn 0.01
Operate delay time PHPTUC 50...200000 ms 10
Current block value PHPTUC 0.00...0.50 xIn 0.01
Transformer Protection and Control 1MRS757846 A
RET620
Product version: 2.0
36 ABB