SIPROTEC 7SJ81 Overcurrent & Feeder Protection Relay
The 7SJ81 Overcurrent Protection Relay from Siemens SIPROTEC 5 Series offers a reliable solution for advanced overcurrent and feeder protection in industrial and utility power systems in Mumbai. Designed with 4xI (4xV) inputs, this numerical relay ensures precise monitoring, control, and fast response, making it ideal for safeguarding critical equipment.
Built on Siemens’ trusted technology, the 7SJ81 Overcurrent Protection Relay delivers high performance, flexibility, and seamless integration into modern power networks. It provides robust protection, automation, and monitoring capabilities to maintain system stability and prevent downtime.
As an authorized Siemens SIPROTEC distributor in Mumbai, we supply genuine 7SJ81 Overcurrent Protection Relays at competitive prices with fast delivery. Whether you require a single unit or bulk orders, our expert team offers technical guidance and reliable support.
Key Features:
- Model: 7SJ81 Overcurrent Protection Relay
- Series: SIPROTEC 5 Series – Overcurrent & Feeder Protection
- Inputs: 4xI (4xV) for advanced protection functions
- Application: Industrial power systems, substations, utilities
- Location: Available from trusted suppliers & distributors in Mumbai
- Benefits: High reliability, Siemens quality, quick local support
Function
DIGSI 5 permits all functions to be configured and combined as required.
- Directional and non-directional overcurrent protection with additional functions
- Detection of ground faults of any type in compensated or isolated electrical power systems through the following functions: 3I0>, V0>, transient ground fault, cos φ, sin φ, directional detection of intermittent ground faults, and admittance.
- Arc protection (note the resulting communication restrictions)
- Overvoltage and undervoltage protection
- Frequency protection and frequency change protection for load shedding applications
- Power protection, configurable as active or reactive power protection
- Directional reactive power undervoltage protection (QU protection)
- Control with switchgear interlocking protection
- Synchro-check
- Circuit-breaker failure protection
- Detection of current and voltage signals up to the 50th harmonic with high accuracy for selected protection functions and operational measured values
- Graphical logic editor to create powerful automation functions in the device
- Single-line representation in small or large display
- Integrated electrical Ethernet RJ45 for DIGSI 5 and IEC 61850 (reporting and GOOSE) 1 optional, plug-in module for a) communication protocols or b) for arc protection
- Redundant and simple communication protocols according to IEC 61850-8-1, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO
- Reliable data transmission via PRP and HSR redundancy protocols
- Extensive cyber security functionality and including role-based access control (RBAC), protocol security-related events, and signed firmware
- Simple, quick and secure access to device data via a standard Web browser – without additional software
- Time synchronization using IEEE 1588
- Standard fault recording (buffer for a max. record time of approx. 40 sec. at 2 kHz)
- Auxiliary functions for simple tests and commissioning
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