IEEE Power & Energy Magazine - May/June 2014 - 85

The maintenance and constant development of TSAPM
rules have become more and more time consuming
and resource intensive.

✔ the actual arming pattern of the ras systems from arming

station rTUs and scada (from rasa).
in addition, data output from TsaPM includes:
✔ transfer limits displayed in a table and alarm messages
in case of limit violation
✔ the rasa pattern recommendation, which is sent to
the rasa application for downloading to arming station rTUs
✔ alarms
✔ the TsaPM error log
✔ the TsaPM execution message log.

RASA Functionality

rTUs via scada to the rasa application and TsaPM.
Both actual and recommended rasa patterns are displayed
in the eMs user interface for comparison and validation. Toggling the circle at the intersection of the set column and a
contingency row allows switching the arming mode between
manual (shown as a red circle) and automatic (a green circle)
for the corresponding contingency. in manual mode, operators
can arm or disarm units for shedding to cope with the contingency. from the rasa application user interface, a unit can
be manually enabled or disabled for shedding by toggling the
unit number.
The rasa application contains a rasa database
(rasadB) that defines controls (set point, latch point,
and arming status points) associated with each tripped element under each contingency. in each execution cycle, the
rasadB is initially copied from the rasa application to
TsaPM. after TsaPM generates a rasa pattern, it communicates with rasa to overwrite the recommended bits
from the rasadB in TsaPM to the rasadB in rasa
(see figure 12). during the process, only the recommended
bits are modified in rasa's rasadB. The statuses of shedding devices in the rasa application are updated from arming station rTUs via scada every 2 s.

as mentioned earlier, the rass in the Bc transmission system
are armed periodically to match continuously changing power
system conditions. The arming pattern is determined by the
TsaPM application within eMs/scada at system control
centers. in cases where a difference is detected between the
arming pattern actually in effect and the arming pattern recommended by TsaPM, the recommended arming pattern is
downloaded to arming station rTUs as soon as it is confirmed
to be valid.
The rasa application is a scada program responsible
for downloading the rasa patterns determined by TsaPM
from the control center to arming station rTUs. it will TSAPM Automatic Downloading
receive the desired arming pattern from the TsaPM appli- The execution of TsaPM can be triggered in three ways:
cation, issue the necessary supervisory commands required
✔ by the periodic 4-min timer
to download the arming pattern, and display both the desired
✔ through manual execution
and the actual arming patterns. it is also possible for the user
✔ as a result of scada events (including switching events).
to manually enter the specific arming requirements or overeach time it executes, TsaPM recommends a new rasa
ride the automatic arming.
pattern to match the precontingency power system condifor shedding to be valid, the generator circuit breaker tions. To ensure that rasa patterns in arming station rTUs
(cB) must be closed, the unit must be available for shedding and Plcs are consistent with continuously changing power
(i.e., the manually entered shed status must be set to "shed"), system conditions, the faster automatic arming process is
and the unit must not be in synchronous condense mode routinely implemented to minimize manual intervention.
or ramping mode. The TsaPM
application will consider these
TSAPM Application
RASA Application
status points in its deliberation.
figure 11 shows one of the four
pages of the generation-shedding
displays. each row represents a
RASA
Other
RASA
contingency, and each column of
Database
Databases
Database
square boxes corresponds to a unit,
on top of which the unit number is
indicated. The actual rasa pattern is fed back from arming station figure 12. The data exchange between TSAPM and RASA.
may/june 2014

ieee power & energy magazine

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Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2014

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