ABB Relion 670 Series Applications Manual page 277

1MRK 511 401-UUS F
The change over time of these quantities with respect to the old value can be supervised with this
function.
13.6.3 Setting guidelines
Operation : This setting is used to enable/disable the delta supervision function.
MinStVal : The minimum start level of the function. If the input is below this level, the function will
be blocked. It should be set depending on the input connected.
DelSt> : This setting is used to set the start value for delta detection.
DeltaT : This setting defines the number of execution cycles of old data to be used for delta
calculation. That is, if
to compare the change against.
tHold : This setting defines the pulse length for the start signal. A typical value of this setting is 100
ms.
Bay control REC670
Application manual
DeltaT setting is set as 6 for a 3 ms function, an 18 ms old value will be used
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Section 13
Secondary system supervision
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