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Siemens SIPROTEC 4 7SJ61 User Manual

Siemens SIPROTEC 4 7SJ61
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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

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Siemens SIPROTEC 4 7SJ61 Specifications

General IconGeneral
Frequency50/60 Hz
Input Current1 A or 5 A
Current Inputs3
Digital Inputs8
WeightApprox. 1.5 kg
Protection FunctionsOvercurrent, earth fault
Communication ProtocolsIEC 61850, DNP3, Modbus
Communication InterfacesEthernet, RS485
Operating Temperature-25 to +55 °C
Storage Temperature-40 to +70 °C
MountingDIN rail mounting
HousingPlastic

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