Siemens SIPROTEC 7SJ62 Manual page 30

Introduction
1.3 Characteristics
Fault Location
• Initiation by trip command, external command or dropout of pickup;
• Fault distance is calculated and the fault location given in ohms (primary and secondary) and in kilometers
or miles;
• up to three line sections can be configured.
Breaker Failure Protection 50 BF
• Checking current flow and/or evaluation of the circuit breaker auxiliary contacts;
• Initiated by the tripping of any integrated protective element that trips the circuit breaker;
• Initiation possible via a binary input from an external protective device.
Flexible Protective Functions
• Up to 20 protection functions which can be set individually to operate in three-phase or single-phase mode;
• Any calculated or directly measured value can be evaluated on principle;
• Standard protection logic function with definite time characteristic;
• Internal and configurable pickup and dropout delay;
• Modifiable message texts.
Synchrocheck (only 7SJ623, 7SJ624 and 7SJ64)
• Verification of the synchronous conditions before reclosing after three-pole tripping;
• Fast measurement of the voltage difference ∆V, the phase angle difference ∆ϕ and the frequency difference
∆f;
• Alternatively, check of the de-energized state before reclosing;
• Switching possible for asynchronous system conditions with prediction of the synchronization time (only
7SJ64);
• Settable minimum and maximum voltage;
• Verification of the synchronous conditions or de-energized state also possible before the manual closing of
the circuit breaker, with separate limit values;
• Measurement also possible via transformer without external intermediate matching transformer;
• Measuring voltages optionally phase–to–phase or phase–to–ground.
RTD-Boxes
• Detection of any ambient temperatures or coolant temperatures by means of RTD-Boxes and external tem-
perature sensors.
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SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008