Fault Records; Energy Storage - 7Sr12; Figure 4-14 Energy Direction Convention - Siemens 7SR11 Manual

Stored waveforms can be erased using the DATA STORAGE/Waveform Storage>Clear Waveforms setting or
from Reydisp.
6.3.5

Fault Records

Up to ten fault records can be stored and displayed on the Fascia LCD. Fault records can be triggered by user
selected relay operations or via a suitably programmed binary input. An output is provided to indicate when a
new record has been stored.
Fault records provide a summary of the relay status at the time of trip, i.e. the element that issued the trip, any
elements that were picked up, the fault type, LED indications, date and time. The Max Fault Rec. Time setting
sets the time period from fault trigger during which the operation of any LEDs is recorded.
The relay can be set to automatically display the fault record on the LCD when a fault occurs by enabling the
SYSTEM CONFIG> Trip Alert setting. When the trip alert is enabled the fault record will be displayed until the
fault is removed.
When examined together the event records and the fault records will detail the full sequence of events leading to
a trip.
Fault records are stored in a rolling buffer, with the oldest faults overwritten. The fault storage can be cleared with
the DATA STORAGE/Fault Storage>Clear Faults setting or from Reydisp.
6.3.6

Energy Storage - 7SR12

The measured Power is continuously integrated (over a one-second window) to produce 4 Energy quantities:
•
Active Export Energy (W)
•
Active Import Energy (W)
•
Reactive Export Energy (VAr)
•
Reactive Import Energy (VAr)
The Direction of Energy transfer is set by: SYSTEM CONFIG> Export Power/Lag VAr. With both Export Power
(W) and Lag VAr (VAr) set to be +ve, the Direction of Energy transfer will follow the IEC convention, as shown in
the figure.
Setting either the Export Power (W) or Lag VAr (VAr) to be -ve, will reverse the Direction of the Energy transfer
for these quantities. So forward VAr will then be reported as Imported Reactive Energy, and forward Watts will be
reported as Exported Active Energy.
©2012 Siemens Protection Devices Limited
Figure 4-13 Energy Direction Convention
7SR11 & 7SR12 Description Of Operation
Chapter 1 Page 73 of 76