Siemens 7SA511 Pickup, Reclaim time, Reverse, Stage, Starpoint, Target, Trip, Relay Model Number

7SA511 Line Protection RelayIntroduction

Terms
pickup	Activation of a protection function either through detection of a fault or as
	a result of a binary input. The current and voltage levels or ratios that
	cause a protection element to pick up are called pickup values.
reclaim time	The no-fault time period following automatic reclose that defines a
	successful reclose
reverse	Direction—normally upstream towards the bus or source (i.e. away from
	the protected object).
stage	A protection element; a group of protection parameters that, at a
	minimum, include pickup and time delay values.
starpoint	Common connection point in wye-connected electrical equipment; the
	neutral connection.
target	System device to which a command or signal is directed.
trip	Activate a trip relay or open a circuit breaker.

1.3 Relay Model Number

The model number for your 7SA511 relay is printed on the relay’s nameplate, which is located on the operator panel (see Figure 2-1 in Chapter 2, “Product Description”). As illustrated in Figure

1-1, you can read your relay’s model number and determine the rated current, DC supply voltage, type of mounting (flush or surface), type of fault detection, and which optional functions your relay has. Using the model number allows you to verify that you have the correct relay for the application.

This manual frequently refers you to the relay model number so you can determine whether or not a particular section is applicable to your relay and protected system. When the model number is used, the character(s) significant to the discussion is bold, and asterisks (*) are used to indicate that the character is irrelevant to the discussion. For example, model number 7SA511*-**A5*- **A/E* means the relay does not have the automatic reclose feature, so you can skip the sections on automatic reclose.

1-6 July 27, 1995