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Siemens SIPROTEC 7SJ80 User Manual

Siemens SIPROTEC 7SJ80
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Undervoltage-controlled reactive power protection (27/Q)
Detection of critical power system situations
Disconnection of power supply facilities from the grid
Reconnection under stable power system conditions
Thermal Overload Protection 49
Thermal profile of energy losses (overload protection has full memory capability)
True r.m.s. calculation
Adjustable thermal warning element
Adjustable alarm level based on current magnitude
Monitoring Functions
Increased reliability due to monitoring of the internal measurement circuits as well as the hardware and
software
Fuse failure monitor with protection function blocking
Monitoring of the current transformer and voltage transformer secondary circuits using sum and
symmetry supervision with optional protection function blocking
Trip circuit monitoring possible
Phase rotation check.
Ground Fault Detection 50N(s), 51N(s), 67N(s), 59N/64
Displacement voltage is measured or calculated from the three phase voltages
Determination of a faulty phase on ungrounded or grounded systems
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, a user-defined characteristic is available
Direction determination with zero sequence quantities(Ι
0
, V
0
), wattmetric ground fault direction determi-
nation
Any element can be set as directional or non-directional — forward sensing directional, or reverse
sensing directional
Optionally applicable as additional ground fault protection.
Intermittent Ground Fault Protection
Detects and accumulates intermittent ground faults
Tripping after configurable total time.
Directional intermittent ground fault protection
Detects intermittent ground faults
Direction determination
Tripping after settable number of intermittent re-ignitions
Introduction
1.3 Characteristics
26 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017

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Siemens SIPROTEC 7SJ80 Specifications

General IconGeneral
Rated Frequency50/60 Hz
Rated Current1 A / 5 A
Operating Temperature-25°C to +55°C
Storage Temperature-40°C to +70°C
Current Transformer Inputs4
ApplicationProtection of feeders, motors, transformers, and generators
Rated Voltage100-240 V AC/DC
Communication ProtocolsIEC 61850, Modbus, DNP3, IEC 60870-5-103
DisplayGraphical LCD
MountingFlush mounting
Protection FunctionsOvercurrent, Earth fault
Communication InterfacesEthernet, RS485
HousingPlastic
WeightApprox. 1.5 kg

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