Siemens 7SJ6225 Protection Relay

Feature & Principle

It is Siemens SIPROTEC 4 series digital feeder protection relay. It adopts high-performance microprocessor, supports phase overcurrent, earth fault, directional overcurrent, breaker failure, overload and undervoltage/overvoltage protection. It collects voltage and current signals for electrical measurement, event log and fault waveform recording. It supports IEC 61850, IEC 103 and Modbus communication, connects to SCADA system. Parameters are configured and fault data analyzed by DIGSI software. This model is discontinued and used for substation feeder maintenance replacement.

Specifications

Model: 7SJ6225 Brand: Siemens Series: SIPROTEC 4 Core functions: Overcurrent, earth fault, directional protection, measurement, fault recording I/O: 11 binary inputs, 6 relay outputs Display: Backlit LCD 4×20 character Communication: IEC61850 Ethernet, IEC60870-5-103, Modbus optional Power supply: 24~250V AC/DC Installation: Panel flush mount Application: Medium voltage feeder, motor and transformer protection cabinet Certification: CE, IEC standard

Components & Diagnostics

Signal sampling unit, main CPU, LCD display panel, communication circuit, status LED, relay output contacts. Common faults: communication disconnection, measurement deviation, false tripping, parameter loss, power supply failure.

Product Brief

7SJ6225 protection relay, Siemens SIPROTEC4 feeder overcurrent protection spare widely used for substation medium voltage cabinet overhaul and replacement.