Figure 3.15-2 The initial diagram
The protection can be blocked by low current, it can be enabled or disabled by setting
27_i_Cur_Blk_Ena, when 27_i_Cur_Blk_Ena=1 and the maximum phase current is less than the
setting 27_i_Cur_Blk, the relay is blocked.
The protection can be blocked by the rate of voltage change, it can be enabled or disabled by
setting 27_i_Dudt_Blk_Ena, when the 27_i_Dudt_Blk_Ena=1 and the du/dt is larger than setting
27_i_Dudt_Blk.
When the relay is enabled, the fundamental frequency component of the measured three phase
voltages and currents are compared phase-wise to the set Start value. If the three phase voltages
are lower than the set value of the voltage, the relay will initial.
3.15.2.2 Timer element
The functional module diagram is shown as below:
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