PHPTUV can be used to disconnect from the network devices, such as electric
motors, which are damaged when subjected to service under low voltage
conditions. PHPTUV deals with low voltage conditions at power system frequency.
Low voltage conditions can be caused by:
• Malfunctioning of a voltage regulator or incorrect settings under manual
control (symmetrical voltage decrease)
• Overload (symmetrical voltage decrease)
• Short circuits, often as phase-to-earth faults (unsymmetrical voltage increase).
PHPTUV prevents sensitive equipment from running under conditions that could
cause overheating and thus shorten their life time expectancy. In many cases,
PHPTUV is a useful function in circuits for local or remote automation processes
in the power system.
4.5.2.7 Signals
Table 394: PHPTUV Input signals
Name Type Default Description
U_A_AB SIGNAL 0 Phase to earth voltage A or phase to phase
voltage AB
U_B_BC SIGNAL 0 Phase to earth voltage B or phase to phase
voltage BC
U_C_CA SIGNAL 0 Phase to earth voltage C or phase to phase
voltage CA
BLOCK BOOLEAN 0=False Block signal for activating the blocking mode
Table 395: PHPTUV Output signals
Name
Type Description
OPERATE BOOLEAN Operate
START BOOLEAN Start
4.5.2.8 Settings
Table 396: PHPTUV Group settings
Parameter
Values (Range) Unit Step Default Description
Start value 0.05...1.20 xUn 0.01 0.90 Start value
Time multiplier 0.05...15.00 0.01 1.00 Time multiplier in IEC/ANSI IDMT curves
Operate delay time 60...300000 ms 10 60 Operate delay time
Operating curve type 5=ANSI Def. Time
15=IEC Def. Time
21=Inv. Curve A
22=Inv. Curve B
23=Programmable
15=IEC Def. Time Selection of time delay curve type
Type of reset curve 1=Immediate
2=Def time reset
-1=DT Lin decr rst
1=Immediate Selection of reset curve type
1YHT530004D05 D Section 4
Protection functions
615 series 479
Technical Manual
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