Siemens SIPROTEC 7UT613 series Manual page 28

1 Introduction
User-defined Logic
Functions (CFC)
Commissioning,
Operation
Monitoring Func-
tions
Further Functions
28
• Freely programmable combination of internal and external signals for the imple-
mentation of user-defined logic functions
• All usual logic functions
• Time delays and limit value inquiries
• Isolation of one side or measuring point for maintenance work: the isolated line or
measuring point is withdrawn from the differential protection system processing,
without affecting the remainder of the protection system
• Comprehensive support facilities for operation and commissioning
• Indication of all measured values, amplitudes and phase relation
• Indication of the calculated differential and restraint currents
• Integrated help tools can be visualised by means of a standard browser: Phasor di-
agrams of all currents of all sides and measuring locations of the protected object
are displayed as a graph.
• Connection and direction checks as well as interface check
• Availability of the device is greatly increased because of self-monitoring of the inter-
nal measurement circuits, power supply, hardware, and software
• Supervision of the current transformer secondary circuits of symmetry and phase
sequence
• Monitoring of the voltage transformer circuits (if voltage inputs are available) for
symmetry, voltage sum and phase rotation
• Supervision of the voltage transformer circuits (if voltage inputs are available) for
voltage failure with fast function blocking that measure undervoltages
• Checking the consistency of protection settings regarding the protected object and
possible assignment of the current inputs: Blocking of the differential protection
system in case of inconsistent settings which could lead to a malfunction
• Trip circuit supervision is possible.
• Broken wire supervision for the secondary CT circuits with fast phase segregated
blocking of the differential protection functions and the unbalanced load protection
in order to avoid spurious tripping.
• Battery-buffered real-time clock, which may be synchronised via a synchronisation
signal (e.g. DCF77, IRIG B via satellite receiver), binary input or system interface
• Continuous calculation and display of operational measured values on the front of
the device; indication of measured quantities of all sides of the protected object
• Fault event memory (trip log) for the last 8 network faults (faults in the power sys-
tem), with real-time assignment
• Fault recording memory and transmission of the data for analogue and user-defined
binary signals with a maximum time range of about 5s
• Switching Statistics: Recording of the trip commands issued by the device, as well
as recording of the fault current data and accumulation of the interrupted fault cur-
rents
7UT613/63x Manual
C53000-G1176-C160-2