GE M60

CHAPTER 2: PRODUCT DESCRIPTION SPECIFICATIONS
M60 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 2-21
2
Break 2: 1.50 to 30.00 pu in steps of 0.01
Operate time: <¾ cycle at I
diff
> 5 × pickup
PHASE/NEUTRAL/GROUND TOC
Current: Phasor or RMS
Pickup level: 0.020 to 30.000 pu in steps of 0.001
Dropout level: 97% to 98% of pickup
Level accuracy:
0.1 to 2.0 × CT: ±0.5% of reading or ±0.4% of rated (whichever is greater)
> 2.0 × CT: ±1.5% of reading > 2.0 × CT rating
Curve shapes: IEEE Moderately/Very/Extremely Inverse; IEC (and BS) A/B/C and Short Inverse; GE IAC Inverse,
Short/Very/ Extremely Inverse; I
2
t; FlexCurves™ (programmable); Definite Time (0.01 s base
curve)
Curve multiplier: Time Dial = 0.00 to 600.00 in steps of 0.01
Reset type: Instantaneous/Timed (per IEEE)
Curve timing accuracy at 1.03 to 20 x pickup:
±3.5% of operate time or ±½ cycle (whichever is greater) from pickup to operate
Voltage restraint: Modifies pickup current for voltage in the range of 0.1 < V < 0.9 VT Nominal in a fixed linear rela-
tionship
PHASE/NEUTRAL/GROUND IOC
Current: Phasor only
Pickup level: 0.020 to 30.000 pu in steps of 0.001
Dropout level: 97 to 98% of pickup
Level accuracy:
0.1 to 2.0 × CT rating: ±0.5% of reading or ±0.4% of rated (whichever is greater)
> 2.0 × CT rating: ±1.5% of reading
Overreach: <2%
Pickup delay: 0.00 to 600.00 s in steps of 0.01
Reset delay: 0.00 to 600.00 s in steps of 0.01
Operate time: <16 ms at 3 × pickup at 60 Hz (Phase/Ground IOC)
<20 ms at 3 × pickup at 60 Hz (Neutral IOC)
Timer accuracy: ±3% of operate time or ±1/4 cycle (whichever is greater)
PHASE DIRECTIONAL OVERCURRENT
Relay connection: 90° (quadrature)
Quadrature voltage: ABC phase seq.: phase A (V
BC
), phase B (V
CA
), phase C (V
AB
); ACB phase seq.: phase A (V
CB
), phase
B (V
AC
), phase C (V
BA
)
Polarizing voltage threshold: 0.004 to 3.000 pu in steps of 0.001
Current sensitivity threshold: 0.05 pu
Characteristic angle: 0 to 359
° in steps of 1
Angle accuracy: ±2°
Operation time (FlexLogic operands):
Tripping (reverse load, forward fault): <12 ms, typically
Blocking (forward load, reverse fault): <8 ms, typically
NEUTRAL DIRECTIONAL OVERCURRENT
Directionality: Co-existing forward and reverse
Polarizing: Voltage, Current, Dual, Dual-V, Dual-I
Polarizing voltage: V_0 or VX
Polarizing current: IG
Operating current: I_0
Level sensing: 3 × (|I_0| – K × |I_1|), IG
Restraint, K: 0.000 to 0.500 in steps of 0.001
Characteristic angle: –90 to 90° in steps of 1
Limit angle: 40 to 90° in steps of 1, independent for forward and reverse
Angle accuracy: ±2°