Siemens 7SA511 manual About the Relay

7SA511 Line Protection Relay Chapter 2

2. Product Description

2.1 About the Relay

The 7SA511 line protection relay is a microprocessor-based relay designed to provide fast, reliable, and selective clearance of all kinds of ground and phase faults on overhead lines and cables being fed from one point or multiple points. The system can be radial, ring, or meshed topography. The system starpoint can be solidly grounded, compensated (resonant grounded), or isolated (ungrounded). This relay has 10 binary inputs, 5 trip relays, 11 signal relays, and 16 LED indicators.

The relay can be flush or surface mounted and is easily programmed and operated using the controls and keypad on the operator panel. The LEDs on the operator panel continuously display relay status and target indication. When prompted, the LCD shows the system settings, configuration settings, protection settings, measured values, calculated values, setting options, event messages, and other operational information.

The relay can be connected to a PC or to a substation control system, enabling the user to analyze data stored in the relay’s memory and to monitor the relay’s alarms and status signals.

July 27, 1995 2-3