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1MAC050144-MB C Section 4Protection functions

615 series ANSI 235

Technical Manual

27 prevents sensitive equipment from running under conditions that could causeoverheating and thus shorten their life time expectancy. In many cases, 27 is a usefulfunction in circuits for local or remote automation processes in the power system.

4.2.2.7 SignalsTab le 231 : 27 1 /2 I nput signal s

Tab le 232 : 27 1 /2 Ou tput signal s

4.2.2.8 SettingsTable 233 : 27 1 /2 Group set ti ngs

Name Type Default Description

V_A_AB SIGNAL 0 Phase to ground voltage A or phase to phase voltage AB

V_B_BC SIGNAL 0 Phase to ground voltage B or phase to phase voltage BC

V_C_CA SIGNAL 0 Phase to ground voltage C or phase to phase voltage CA

BLOCK BOOLEAN 0=False Block signal for activating the blocking mode

Name Type Description

TRIP BOOLEAN Trip

PICKUP BOOLEAN Pickup

Parameter Values Range) Unit Step Default Description

Pickup value 0.05...1.20 xVn 0.01 0.90 Pickup value

Time multiplier 0.05...15.00 0.05 1.00 Time multiplier in IEC/ANSI IDMT curves

Trip delay time 60...300000 ms 10 60 Trip delay time

Operating curve type 5=ANSI DT15=IEC DT21=Inv. Curve A22=Inv. Curve B23=Programmable

5=ANSI DT Selection of time delay curve type

Type of reset curve 1=Immediate2=Def time reset-1=DT Lin decr rst

1=Immediate Selection of reset curve type

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