GE P444

P
44x/EN ST/Hb6
Setting
(ST) 4
-22 MiCOM P40 Agile
P442, P444
Menu text Default setting
Setting range
Step size
Min Max
GROUP 1: POWER SWING
IN > (% Imax) 40% 10% 100% 1%
Residual current threshold for power swing unblocking. It is a percentage of the highest
measured current on any phase.
– Typical setting: 40%
– Minimum setting (to avoid maloperation for asymmetric in power swing currents): > 30%
– Maximum setting (to ensure unblocking for line faults): < 100%
I2 > Status Enabled Disabled or Enabled
Negative Sequence current power swing unblocking criteria activation:
Enables or disables the phase-phase fault protection during Power Swing Blocking. When
enabled, the relay will trip when I
2
> ‘I2 > (% Imax)’ or when I
2
< 0.1 × In.
I2 > (% Imax) 30% 10% 100% 1%
Negative Sequence current threshold for power swing unblocking. It is a percentage of the
highest measured current on any phase.
– Typical setting: 30%
– Minimum setting (to avoid maloperation for asymmetric in power swing currents): > 10%
– Maximum setting (to ensure unblocking for line faults): < 50%
Imax line > Status Enabled Disabled or Enabled
Phase current power swing unblocking criteria activation:
Enables or disables the three-phase fault protection during Power Swing Blocking. When
enabled, the relay will trip when phase current threeshold exceeds Imax line >.
Imax line > 3 x In 1 x In 20 x In 0.01 x In
Phase current threshold for power swing unblocking (unit:A)
– Minimum setting: 1.2 × [ maximum power swing current ]
– Maximum setting: 0.8 × [ minimum phase fault current level ]
Delta I Status Enabled Disabled or Enabled
Delta I criterion status activation:
Enables or disables the unblocking logic three-phase fault protection during Power Swing
Blocking. Time delay is settable.
Unblocking Time delay 30s 0 30s 0.1s
Time-delay after which blocking criteria is automatically removed. Typical setting:
– 30s if a near permanent block is required,
– 2s if unblocking is required to split the system.
Blocking Zones 00000000 Bit 0: Z1/Z1X Block, Bit 1: Z2 Block,
Bit 2: Zp Block, Bit 3: Zq Block, Bit 4: Z3
Block, Bit 5: Z4 Block
Allow zone blocking in case of a power swing.
The Blocked Zones function bits are set to 1 to block zone tripping or are set to 0 to allow
tripping as normal.
When the criteria for power swing detection are met (3 single phase loop inside the quad &
crossing the ∆R band in less than 5
ms in a 50 Hz network), and when out of step tripping is
selected, then the distance protection with all of its stages is blocked –
to prevent tripping by
the distance protection (the relay can operate normally for any fault occurring during a
power swing as there are different criteria which can be used by monitoring current & delta
current).
Out of Step 1 1 255 1
Threshold of number of out of steps. Triggers DDB #352 when reached.
Setting of the number of steps to confirm Out Of Step (OOS) condition.