Characteristics
General Features
•
Powerful 32-bit microprocessor system
•
Complete digital measured value processing and control, from the sampling and digitalization of the
analogue input quantities to the initiation of outputs for tripping or closing circuit breakers
•
Complete galvanic and reliable separation between the internal processing circuits of the device and the
external measurement, control, and power supply circuits because of the design of the analog input
transducers, binary input and output modules, and the DC/DC or AC/DC converters
•
Suitable for power transformers, generator, motors, reactors, or smaller busbar arrangements, as well as
for multi-terminal lines and multi-winding transformers
•
Easy device operation through an integrated operator panel or by means of a connected personal
computer running DIGSI.
Transformer Differential Protection
•
Current restraint tripping characteristic
•
Restraint feature against high inrush currents with 2nd harmonic
•
Restraint feature against high inrush currents with Current waveform analysis CWA
•
Restraint feature against transient and steady-state fault currents caused e.g. by overexcitation of trans-
formers, using a further harmonic (3rd or 5th harmonic)
•
Insensitivity to DC components and current transformer saturation
•
High level of stability even with different degrees of current transformer saturation
•
High-speed instantaneous trip in case of high-current transformer faults
•
Independent of the conditioning of the starpoint(s) of the power transformer
•
Adjustable to the conditioning of the starpoint(s) of the power transformer
•
Increased earth-fault sensitivity during detection of the ground current of an earthed transformer
winding
•
Integrated matching of the transformer connection group
•
Integrated matching of the transformation ratio including different rated currents of the transformer
windings.
Differential Protection for Generators and Motors
•
Current restraint tripping characteristic
•
High sensitivity
•
Short tripping time
•
Insensitivity to DC components and current transformer saturation
•
High level of stability even with different degrees of current transformer saturation
•
Independent of the conditioning of the starpoint
Differential Protection for Mini-Busbars and Short Lines
•
Tripping characteristic with current restraint
•
Short tripping time
•
Insensitivity to DC components and current transformer saturation
1.3
Introduction
1.3 Characteristics
SIPROTEC 4, 7UT6x, Manual 21
C53000-G1176-C230-5, Edition 09.2016
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