3.2 New Techniques for Numerical Device Testing
The core premise is that numerical devices have factory validated
firmware versions that, once confirmed as being installed,
will deliver the specified applications and performance.
As a consequence, the testing and maintenance requirement
can be focused upon the validation of the device stabilization,
operation and reset for each function, rather than Mirroring
of a granular approach more adapted to legacy analogue
equipments.
The new operative testing and maintenance system recommends
testing numerical devices with the SOR (Stabilization-
Operation-Reset) protocol. This protocol is based on the
premise that every protection function could be tested with
three basic points. These points are:
-S (Stability) -stability point of the protection function
(protection function must not start);
-0 (Operative) - point where protection function muststart;
-R (Reset) - point where protection function must reset
(protection function must drop-oft).
These points are calculated in the XRIO module out of the
setting paranmeters and tolerance values which can be found in
the user manual of the protection device:
- TolQrel / TolQabs - relative /absolute quantity tolerance;
- TolTrel / TolTabs -relative /absolute time tolerance;
- RR -reset ratio;
- To - minimum operating time;
- TRo -minimum reset time;
- Q - quantity; T - trip time; TR - reset time.
The XRIO module calculates testing values from the quantity
and tolerance values.
If the measured quantity is higher than the nominal quantity,
the S, 0 and R values are calculated as it is shown in Figure
2a. On the other hand, if the measured quantity is lower than
3.2 New Techniques for Numerical Device TestingThe core premise is that numerical devices have factory validatedfirmware versions that, once confirmed as being installed,will deliver the specified applications and performance.As a consequence, the testing and maintenance requirementcan be focused upon the validation of the device stabilization,operation and reset for each function, rather than Mirroringof a granular approach more adapted to legacy analogueequipments.The new operative testing and maintenance system recommendstesting numerical devices with the SOR (Stabilization-Operation-Reset) protocol. This protocol is based on thepremise that every protection function could be tested withthree basic points. These points are:-S (Stability) -stability point of the protection function(protection function must not start);-0 (Operative) - point where protection function muststart;-R (Reset) - point where protection function must reset(protection function must drop-oft).These points are calculated in the XRIO module out of thesetting paranmeters and tolerance values which can be found inthe user manual of the protection device:- TolQrel / TolQabs - relative /absolute quantity tolerance;- TolTrel / TolTabs -relative /absolute time tolerance;- RR -reset ratio;- To - minimum operating time;- TRo -minimum reset time;- Q - quantity; T - trip time; TR - reset time.The XRIO module calculates testing values from the quantityand tolerance values.If the measured quantity is higher than the nominal quantity,the S, 0 and R values are calculated as it is shown in Figure2a. On the other hand, if the measured quantity is lower than
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