Metering - Siemens 7SR11 Manual

7SR11 & 7SR12 Description Of Operation
When the accumulated Energy quantities reach a set increment, the Relay issues a pulse to the binary outputs:
OUTPUT CONFIG/OUTPUT MATRIX> Active Exp Pulse, Active Imp Pulse, Reactive Exp Pulse and Reactive
Imp Pulse.
The Energy increments are set by the settings: DATA STORAGE/ENERGY STORAGE> Active Exp Energy
Unit, Active Imp Energy Unit, Reactive Exp Energy Unit and Reactive Imp Energy Unit. These setting also
define the resolution of the stored energy values reported by instruments and communications protocols. The
value is stored in the range 0-999999 which continues from zero automatically when 999999 is reached.
6.4

Metering

The metering feature provides real-time data available from the relay fascia in the 'Instruments Mode' or via the
data communications interface.
The Primary values are calculated using the CT and VT ratios set in the CT/VT Config menu.
The text displayed in the relays 'Instruments Mode' associated with each value can be changed from the default
text using the Reydisp software tool.
The user can add the meters that are most commonly viewed to a 'Favourites' window by pressing 'ENTER' key
when viewing a meter. The relay will scroll through these meters at an interval set in the System
Config/Favourite Meters Timer menu.
The energy storage meters can be reset from a binary input and have a user selectable setting for their
measurement in the Data Storage/Energy storage menu.
For a detailed description refer to Technical Manual Chapter 2 – Settings and Instruments.
©2012 Siemens Protection Devices Limited Chapter 1 Page 74 of 76