IL17569
Page 5-6
Effective June, 2001
Table 5.2 IX Measured OC: Independent fourth Ct time overcurrent (51X) and instantaneous (50X-1 & 50X-2)
device settings
Display Setting Description Setpoint Range/ Default Selected Refer to
Value Selection Setting Value Sec. #
51X IX TOC Fourth Ct Time Overcurrent Curve 5.5.2.2
Curve Setting (Uses gnd ct ratio) 8.3
Shape: Select curve characteristic shape IT, I2T, I4T, FLAT, MOD, XTRM
13.4
VERY, XTRM, IECA,
IECB, IECC
Reset: Select curve reset characteristics Inst, Calc, T Delay Calc
Direction: Directional control reserved (Fixed at Both) Both
for future use
51X IX TOC Fourth Ct Time Overcurrent Pickup 5.5.2.2
Setting and Time Multiplier Settings 8.3
Pickup: Select current pickup value 0.1 to 4.0 pu, or Disable 0.50
in per unit values (x I
nom
) (0.01 increments)
Time Mult: Select time multiplier 0.05 to 10.0 1.00
(0.01 increments)
50X-1 IX IOC 1 Fourth Ct Overcurrent 5.5.2.2
Element #1 Setting 8.3
Pickup: Select current pickup value 0.1 to 20.0 pu, or Disable 1.00
in per unit values (x I
nom
) (0.01 increments)
Delay (c): Select delay time in cycles 0 to 9999 60
(1 cycle increments)
Direction: Directional control reserved (Fixed at Both) Both
for future use
50X-1 IX IOC 2 Fourth Ct Overcurrent 5.5.2.2
Element #2 Setting 8.3
Pickup: Select current pickup value 0.1 to 20.0 pu, or Disable 2.00
in per unit values (x I
nom
) (0.01 increments)
Delay (c): Select delay time in cycles 0 to 9999 cycles 6.00
(1 cycle increments)
Direction: Directional control reserved (Fixed at Both) Both
for future use
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