Update Documentation P44x/EN AD/E44
MiCOM P441, P442 & P444
Page 27/82
1. INTRODUCTION
1.2.1 Protection Features
• 27: Undervoltage Protection - Two stage, configurable as either phase to phase or
phase to neutral measuring. Stage 1 may be selected as either IDMT or DT and stage
2 is DT only.
• 49: Thermal overload Protection – as P540 with dual time constant. This element can
provide an alarm and a trip delayed
• 59: Overvoltage Protection - Two stage, configurable as either phase to phase or
phase to neutral measuring. Stage 1 may be selected as either IDMT or DT and stage
2 is DT only.
• …/…
• 78 – 68 :Power swing blocking & Out Of Step detection - Selective blocking of
distance protection zones ensures stability during the power swings experienced on
sub-transmission and transmission systems (stable swing or Out of Step conditions =
loss of synchronism).
1.3 Remark:
• It is recommended to check in the DDB table, the reference number of each cell,
included in the chapter P44x/EN GC/E33 (“Relay menu Data base”)
• Version C2.x uses the model 030 G / 030 H / 030 J
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