Setting Guidelines - Hitachi Relion 670 Series Applications Manual

Section 13
Secondary system supervision
13.5.3

Setting guidelines

Operation: 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>: 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 DeltaT setting is set as 6 for a 3 ms function, an 18 ms old value will be used 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.
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Please ensure that the value provided for DelSt> should be dependent on the input signal
connected. For example, in case of temperature, the set value can be in the range of -40 to
200 degrees. If the value monitored is current , then it can be in the range of few hundreds to
thousand amperes. Similarly, appropriate value needs to be provided depending on the input
as there is a possibility of continuous triggering of the output if the set value is much below
the normal range of variation in the input.
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Phasor measurement unit RES670
Application manual