Monitoring Functions
•
Reliability of the device is greatly increased because of self-monitoring of the internal measurement
circuits, the auxiliary power supply as well as the hardware and software
•
Supervision of the current transformer secondary circuits by means of sum and symmetry checks
•
Trip circuit monitoring possible
•
Phase rotation check.
Ground Fault Detection 50N(s), 51N(s), 67N(s), 59N/64
•
Two-element Ground Fault Detection: 50Ns-1 and 50Ns-2
•
High sensitivity (as low as 1 mA)
•
Overcurrent element with definite time or inverse time delay
•
For inverse time overcurrent protection, characteristics according to IEC or ANSI standards, one userde-
fined and two logarithmic inverse current/time characteristics are available
•
Optionally applicable as additional ground fault protection.
Intermittent Ground Fault Protection
•
Detects and accumulates intermittent ground faults
•
Tripping after configurable total time.
Automatic Reclosing 79
•
Single-shot or multi-shot
•
With separate dead times for the first and all succeeding shots
•
Protective elements that initiate automatic reclosing are selectable. The choices can be different for
phase faults and ground faults
•
Separate programs for phase and ground faults
•
Interaction to time overcurrent protection element and ground fault elements. They can be blocked in
dependence of the reclosing cycle or released instantaneously
Breaker Failure Protection 50 BF
•
By checking the current and/or evaluating the circuit breaker auxiliary contacts
•
Started by any integrated protection function that trips
•
Initiation possible via a binary input from an external protective device.
Flexible Protective Functions
•
Up to 20 customizable protection functions with three-phase or single-phase operation
•
Any calculated or directly measured quantity can be evaluated on principle
•
Standard protection logic with definite time characteristic
•
Internal and configurable pickup and dropout delay
•
Modifiable message texts.
RTD box
•
Detection of any ambient temperatures or coolant temperatures by means of an external RTD box and
external temperature sensors.
Introduction
1.3 Characteristics
24 SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016
To Next Page
Loading...
Need help?
General
