Siemens 7SA63 Numerical Relay

The Siemens 7SA63 Numerical Relay is a digital distance protection relay used in electrical power systems for line protection, control, monitoring, and automation. It belongs to the Siemens SIPROTEC 4 protection relay family and is designed to provide reliable fault detection and fast tripping to protect transmission and distribution lines at all voltage levels. Reliserv Solution+1

Key Features

• Universal distance protection relay for electrical lines and networks. Siemens

• Built-in graphic display with numeric and function keys for easy operation. Reliserv Solution

• Advanced protection and control functions including earth-fault, overcurrent, and voltage protections. DSG Enterprises Ltd

• Communication interfaces for system integration using standard protocols. Reliserv Solution

• Adaptive auto-reclosure and fault locating capabilities. Reliserv Solution

Protection Functions

Typical protection functions available in the 7SA63 numerical relay include:
Distance protection (phase and ground)
High-resistance earth-fault protection
Phase overcurrent and earth fault trip
Power swing detection
Over/under voltage protection
Over/under frequency protection
Switch-onto-fault and STUB bus overcurrent protection
Synchro-check and auto-reclosure features Reliserv Solution+1

Monitoring and Control

The relay supports:
Event and fault logging
Oscillographic fault recording
Trip circuit supervision
Self-supervision and measured-value supervision
Circuit breaker and isolator control functions Reliserv Solution

Applications

The 7SA63 numerical relay is widely used in:
Transmission line protection
Distribution line automation
Substation protection systems
Industrial power networks requiring distance protection schemes DSG Enterprises Ltd

Note: This model is a phase-out product in Siemens catalog and has been succeeded by newer SIPROTEC 5 series relays (e.g., 7SA86 and 7SA87).