1 Introduction
26
7UT613/63x Manual
C53000-G1176-C160-2
Thermal Overload
Protection
• Thermal replica of current-initiated heat losses
• True RMS current calculation
• Can be assigned to any desired side of the protective object
• Adjustable thermal warning stage
• Adjustable current warning stage
• With or without including the ambient or coolant temperature (by means of external
resistance temperature detector via RTD-box)
• Alternative evaluation of the hot-spot temperature according to IEC 60354 with cal-
culation of the reserve power and ageing rate (by means of external resistance tem-
perature detector via RTD-box)
• 2 breaker failure protection functions possible
Overexcitation Pro-
tection (device with
voltage measure-
ment inputs)
• Processing of the voltage/frequency ration U/f, which represents the induction B of
a shunt reactance (transformer, shunt reactor)
• Adjustable warning and tripping stage (with independent delay time)
• Inverse standard characteristic or user-defined trip characteristic for calculation of
the thermal stress, selectable
Reverse Power Pro-
tection (Device with
Voltage Measure-
ment Inputs)
• Real power calculation from positive sequence components
• Short operating time or exact calculation of the active power via 16 cycles
• Exact real power calculation for small power factor by compensating the error angle
of the measuring locations
• Insensitive to power fluctuations
• Short-time stage with external criteria, e.g. with closed emergency tripping
Forward Power
Monitoring (devic-
es with measuring
voltage inputs)
• Real power calculation from positive sequence components
• Supervision of overvoltage (P>) or undervoltage (P<) of power with individually ad-
justable power limits
• Short operating time or exact calculation of the active power via 16 cycles
• Automatic blocking of stage P< for recognised measured voltage failure or wire
break in CT secondary circuit
Undervoltage Pro-
tection (Device with
Voltage Measure-
ment Inputs)
• Two-stage three-phase undervoltage measurement
• Evaluation of positive sequence component of the connected voltages, therefore in-
dependent of asymmetries
• Automatic blocking for measuring voltage failure
• Adjustable dropout ratio
Overvoltage Pro-
tection (Device with
Voltage Measure-
ment Inputs)
• Two-stage three-phase overvoltage measurement
• Evaluation of the largest of the three phase-to-ground voltages or the largest of the
three phase-to-phase voltages (largest of the three phase-to-phase voltages (can
be set)
• Adjustable dropout ratio
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