Introduction
The measurands are recorded from the analogue inputs.
Further measurands are calculated from these measured values where the instrument or meter requires meas-
urands from more than 1 input. For example, the electric power is calculated from the voltage and current
measurands.
For the display, the measured values of a device are summed up in the following groups:
•
Operational measured values
•
Fundamental and symmetrical components
•
Function-specific measured values
•
Minimum values, maximum values, average values
•
Energy metered values
The device instrumentation and metering provides real-time measured quantities and data, this is displayed on
the relay fascia LCD (when in
Instruments Mode
) or via the data communications interface.
The primary values are calculated using the CT and VT parameters i.e. the values entered in the
Configura-
tion > CT/VT
menu – see section
.
The user can add the meters that are most commonly viewed to a
Favorites
window by pressing the
Enter
key when viewing a meter. The relay will display the favorite meters after elapse of the
Configuration >
Device > Favorite Meters Timer
setting. When more than 1 favorite meter is selected each selected
meter is displayed on the LCD for 5 seconds.
The energy storage meters can be reset from a binary input and have a user selectable setting for their meas-
urement in the
Configuration > Data Storage
.
Counter instruments can be rest by pressing the ▶ key when the instrument is displayed.
8.1
Instruments and Meters
8.1 Introduction
394
Reyrolle 7SR5, Transformer Protection Device, Device Manual
C53000-G7040-C015-1, Edition 11.2019
