P44x/EN AP/Hb
MiCOM P40 Agile P442, P444
(AP) 5-
P3053ENa
Z2
Z2
Trip
Z2
LOL-A
LOL-B
LOL-C
Z1
Z1
Z1 Z1
&
&
&
0
40ms
18ms
0
1
Figure 48: Loss-of-load accelerated trip scheme
For circuits with load tapped off the protected line, care must be taken in setting the loss of
load feature to ensure that the I< level detector setting is above the tapped load current.
When selected, the loss of load feature operates in conjunction with the main distance
scheme that is selected. In this way it provides high speed clearance for end zone faults
when the Basic scheme is selected or, with permissive signal aided tripping schemes, it
provides high speed back-up clearance for end zone faults if the channel fails.
Note: Loss of load tripping is only available where 3 pole tripping is used.
3.3 Power Swing
See section 4.1.
3.4 Other protection considerations - settings example
3.4.1 Distance Protection Setting Example
3.4.1.1 Objective
To protect the 100km double circuit line between the Green Valley and Blue River
substations using relay protection in the POP Z2 Permissive Overreach mode and to set the
relay at Green Valley substation, as shown in Figure 49.
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