Siemens Reyrolle 7SR46 - Page 13

Protection Functions
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50 Instantaneous overcurrent – phase
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50LC/SOTF Line check/Switch onto fault
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50N Instantaneous earth fault – derived
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51 Time-delayed overcurrent – phase
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51N Time-delayed earth fault – derived
Supervision Functions
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81HBL2 Inrush-current detection
Modular Concept
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Modular system design in hardware, software, and communication
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Functional integration of various applications, such as protection, control, and fault recorder
•
Consistent functionality across the entire family of devices
•
Upgrade path using software libraries and updates
•
Flexible hardware architecture
•
Self-monitoring routines for device faults
General Properties
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CT powered with option for an external auxiliary supply connection
•
Dedicated switch-on-to-fault (SOTF) protection
•
Self-monitoring – Including battery condition monitor
•
High sensitivity – Relay healthy at 0.8 ⋅ I
smin
(1-phase) and 0.4 ⋅ I
smin
(3-phase)
•
Intelligent power management – Fail-safe startup and shut down modes
•
Removable lithium battery backup for viewing fault data, setting the protection, and resetting of indica-
tions
•
Compatible with 6 types of specific CTs (class 5P80) - giving wide range of operation
•
Suitable for RMU mounting
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Front fascia with 2 non-programmable LEDs and 2 user programmable LEDs
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1 Mechanical flag for trip indication
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1 External trip input
Communication Protocols Supported
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IEC 60870-5-103
•
Modbus RTU
Introduction
1.1 7SR46 Overcurrent and Earth Fault Relay Overview
Reyrolle, 7SR46 Device, Manual 13
C53000-G7040-C103-1, Edition 10.2022