Global Protection Settings

Global protection settings are settings that apply regardless of which trip is active.

The Global Protection Settings for the active protection group determine if a protection pick up of any of the basic current operated protection elements has occurred. They do this by comparing the measured or calculated current for each element with the Setting Current and Pickup Multiplier setting for that element.

Protection Pickup occurs when the measured current exceeds the Setting Current x the highest active multiplier for that element.

With the settings in the figure below, the phase pickup current would be
200 x 1.0 = 200 A that is the Phase Setting Current (200 A) x the Phase Pickup Multiplier (1.0).

So in this case, the pickup current and the setting current for the Phase element are the same.

The image below shows a changed Phase Pickup Multiplier setting of x1.2. With these settings, the phase pickup current would be 240 A, that is 200 A x 1.2.

So, in this case the pickup current and the setting current for the Phase element are not the same.

A Fault Reset occurs when the measured current has fallen back below the pickup level by a set amount for a set time.

The Reset Threshold Multiplier setting for each element determines the level at which the measured quantity must drop to after a pickup to start the Fault Reset Time. These settings are all 90% by default and can be configured between 90% and 100%. There is one Fault Reset Time setting for all four elements which defaults to 50 ms. It can be set between 0 ms and 10000 ms.