Siemens 7SJ6225 Protection Relay

Feature & Principle

It belongs to Siemens SIPROTEC 4 series numerical multifunction feeder protection relay. It samples current and voltage signals, provides directional / non-directional phase overcurrent, sensitive earth fault, negative sequence, voltage and frequency protection. Built-in CFC programmable logic, breaker control, event logging and oscillographic fault recording. It supports multiple communication protocols such as IEC61850, IEC60870-5-103 and Modbus. Parameter configuration and fault diagnosis are completed by DIGSI 4 software, widely used in medium voltage power distribution system.

Specifications

Model: 7SJ6225 Brand: Siemens Series: SIPROTEC 4 Main protection: Directional overcurrent, sensitive earth fault, voltage / frequency protection Logic: CFC programmable function chart Display: Graphic LCD Communication: IEC61850, IEC60870-5-103, Modbus I/O: Configurable binary inputs and relay outputs Mounting: Flush panel mount Power supply: 110~250VDC / 115~230VAC Application: Medium voltage feeder, motor, capacitor bank protection cabinet Certification: CE, IEC60255

Components & Diagnostics

AC sampling unit, main CPU, graphic display module, communication interface chip, relay output matrix, watchdog circuit, status LED indicators. Common faults: communication offline, measurement drift, false tripping, breaker control failure, power supply abnormality.

Product Brief

7SJ6225 feeder protection relay, Siemens SIPROTEC 4 power distribution protection spare widely used for MV switchgear overhaul and replacement.