ABB RELION REX640 Technical Manual page 856

Protection functions
It is essential to provide power frequency overvoltage protection, in the form of
time delayed element, either IDMT or DT to prevent equipment damage.
4.5.1.8 Signals
PHPTOV Input signals
Table 782: PHPTOV Input signals
Name
U3P
BLOCK
PHPTOV Output signals
Table 783: PHPTOV Output signals
Name
OPERATE
START
4.5.1.9 PHPTOV Settings
Table 784: PHPTOV Group settings (Basic)
Parameter Values (Range)
Start value 0.05...1.60
Time multiplier 0.025...15.000
Operate delay time 40...300000
Operating curve
5=ANSI Def. Time
type
15=IEC Def. Time
17=Inv. Curve A
18=Inv. Curve B
19=Inv. Curve C
20=Programmable
Table 785: PHPTOV Group settings (Advanced)
Parameter Values (Range)
Type of reset curve
1=Immediate
2=Def time reset
Type of time reset
1=Freeze Op timer
2=Decrease Op tim-
er
856
Type
SIGNAL
BOOLEAN
Type
BOOLEAN
BOOLEAN
Unit Step
xUn 0.01
0.005
ms 10
Unit Step
Default Description
- Three-phase voltages
0=False Block signal for acti-
vating the blocking
mode
Description
Operate
Start
Default
1.10
1.000
40
15=IEC Def. Time
Default
1=Immediate
1=Freeze Op timer
1MRS759142 F
Description
Start value
Time multiplier
in IEC/ANSI IDMT
curves
Operate delay time
Selection of time
delay curve type
Description
Selection of reset
curve type
Selection of time
reset
REX640
Technical Manual