Siemens 7SR224 Argus Manual page 6

27/59 Voltage Sag/Swell
Power System Utilities use SARFI indices of Voltage Sag and
Swell, which express the magnitude and duration of Sag and
Swell variations occurring on their systems. These indices
are based on the 'ride-through' capability of the customer's
plant and are usually expressed in terms of the number of a
specific class (index) of r.m.s. variation per customer per
specified period.
These elements provide the raw data in the form of counters
that display the total count of each type of index value. Sags
have a greater impact on plant performance than Swells.
Disturbances are classified according to their magnitude and
duration, the limits can be User set for SIARFI, SMARFI &
STARFI. Breaks above 60s duration are Interruptions.
Counters for each are provided per pole.
Programmable User Logic
Each Protection element output can be used for Alarm &
Indication and/or tripping.
User can freely map any protection element output to any
Binary Output(s); and any Binary Input(s) to any Function
Inhibit(s), Binary Output, LED's and/or internal Virtual signal
points. User can also enter up to 16 Equations via the HMI or
from a pc, defining User scheme-logic using standard
Boolean Logic e.g. ( )/AND/OR/NOT/XOR, to combine BI, other
Equations, Function Keys, LEDs, BO, and internal Virtual
signal points. Each equation has PU/DO Time Delays and a
Target Counter. Each Equation appears in the Output matrix
and can be freely mapped to LEDs/BO.
In addition, the Reydisp Manager pc application provides
graphical programming of user logic within the device.
Circuit Breaker Maintenance
Four circuit breaker trip counters are provided:-
Total Trip Count increments upon each trip command issued
to give data for maintenance.
Delta Trip Count is an additional counter which can be reset
independently of the Total Trip Counter and counts the
number of operations since the last reset.
Frequent Operations Counter monitors the number of trip
operations in a rolling window period of one hour and
operates to stop cyclical sequences if the set number is
exceeded.
An I 2 t summation Counter provides a means monitoring
contact wear indicating the total energy interrupted by the
circuit breaker contacts.
Each counter has a user set target operations count which,
when reached, can be mapped to raise Alarms/ Binary
Outputs.
Function LED's
Eight (E10 case) or sixteen (E12) user programmable tri-
colour LED's are provided eliminating the need for expensive
panel mounted pilot lights and associated wiring. Each LED
can be user set to red, green or yellow allowing for clear
indication of the associated function's state. A slip-in label
pocket along-side enables the user to insert his own
notation. A printer compatible template is available.
Siemens Protection Devices Limited
Function Keys
Twelve user programmable function keys are available for
implementing User logic and scheme control functionality,
eliminating the need for expensive panel mounted control
switches and associated wiring. Each function key has an
associated user programmable tri-color LED (red, green,
yellow) allowing for clear indication of the associated
function's state. A slip-in label pocket along-side enables the
user to insert his own notation for the Function Key LED
Identification.
Each Function Key can be mapped directly to any of the
built-in Controller/Circuit Breaker Command functions or to
the User Logic equations.
Fig 1. Tri-colour LED's and function keys
6