Performance Of Current Protection Functions; Three-Phase Overcurrent Protection; Three-Phase Overcurrent Directional Parameters; Thermal Overload Protection - GE P24DM Technical Manual

Chapter 21 - Technical Specifications
3

PERFORMANCE OF CURRENT PROTECTION FUNCTIONS

3.1

THREE-PHASE OVERCURRENT PROTECTION

IDMT pick-up
DT Pick-up
Drop-off (IDMT and DT)
IDMT operation (for IEC and UK curves)
IDMT operation (IEEE and US curves)
For TD setting < 100s
IDMT operation (IEEE and US curves)
For TD setting > 100s
Disengagement
DT operate
DT reset
Repeatability
Overshoot of overcurrent elements
3.1.1

THREE-PHASE OVERCURRENT DIRECTIONAL PARAMETERS

Directional boundary accuracy (RCA +/-90%)
IDMT operate
Disengagement
DT operate
DT reset
3.1.2

THERMAL OVERLOAD PROTECTION

Setting accuracy
Reset
Thermal alarm Pick-up
Cooling time constant typical accuracy
Repeatability
3.2

EARTH FAULT PROTECTION

IDMT pick-up
434
1.05 x Setting +/-5%
Setting +/- 5%
0.95 x setting +/- 5%
+/- 5% or 60 ms, whichever is greater (1.05 – <2) Is
+/- 5% or 40 ms, whichever is greater (2 – 20) Is
+/- 5% or 60 ms, whichever is greater (1.05 – <2) Is
+/- 5% or 40 ms, whichever is greater (2 – 20) Is
+/- 15% (1.05 - 20) Is
< 40 ms
+/- 2% or 70 ms, whichever is greater (1.05 – <2) Is
+/- 2% or 50 ms, whichever is greater (2 – 20) Is
Setting +/- 5%
+/- 2.5%
<30 ms
+/-2° with hysteresis <3°
+/- 5% or 70 ms, whichever is greater (1.05 – <2) Is
+/- 2% or 50 ms, whichever is greater (2 – 20) Is
< 40 ms
+/- 2% or 80 ms, whichever is greater (1.05 – <2) Is
+/- 2% or 60 ms, whichever is greater (2 – 20) Is
Setting +/-5%
±5%
97% of thermal setting ±5%
Calculated trip time ±5% or 40 ms whichever is greater
±5% of theoretical
<2.5%
Measured and Derived
1.05 x Setting +/-5%
P24xM
P24xM-TM-EN-2.1