CHAPTER 2: PRODUCT DESCRIPTION
SPECIFICATIONS
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
2-17
2
Level sensing:
3
×
(|I_0| –
K
×
|I_1|), IG
Independent for forward and reverse
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°
Offset impedance:
0.00 to 250.00
Ω
in steps of 0.01
Pickup level:
0.002 to 30.000 pu in steps of 0.01
Dropout level:
97 to 98%
Operation time:
<16 ms at 3
×
pickup at 60 Hz
SENSITIVE DIRECTIONAL POWER
Measured power:
3-phase, true RMS
Number of stages:
2
Characteristic angle:
0 to 359° in steps of 1
Calibration angle:
0.00 to 0.95° in steps of 0.05
Minimum power:
–1.200 to 1.200 pu in steps of 0.001
Pickup level accuracy:
±1% or ±0.001 pu, whichever is greater
Hysteresis:
2% or 0.001 pu, whichever is greater
Pickup delay:
0 to 600.00 s in steps of 0.01
Timer accuracy:
±3% of operate time or ±1/4 cycle (whichever is greater)
Operate time:
<50 ms
PHASE UNDERVOLTAGE
Pickup level:
0.004 to 3.000 pu in steps of 0.001
Dropout level:
102 to 103% of pickup
Level accuracy:
±0.5% of reading from 10 to 208 V
Curve shapes:
GE IAV Inverse;
Definite Time (0.1s base curve)
Curve multiplier:
Time dial = 0.00 to 600.00 in steps of 0.01
Curve timing accuracy at <0.90 x pickup:
±3.5% of operate time or ±1/2 cycle (whichever is greater) from pickup to operate
Operate time:
<30 ms at 0.9 pickup at 60 Hz for Definite Time mode
PHASE OVERVOLTAGE
Voltage:
Phasor only
Pickup level:
0.004 to 3.000 pu in steps of 0.001
Dropout level:
97 to 98% of pickup
Level accuracy:
±0.5% of reading from 10 to 208 V
Pickup delay:
0.00 to 600.00 in steps of 0.01 s
Operate time:
<
30 ms at 1.10
×
pickup at 60 Hz
Timer accuracy:
±3% of operate time or ±1/4 cycle (whichever is greater)
UNDERFREQUENCY
Minimum signal:
0.10 to 1.25 pu in steps of 0.01
Pickup level:
20.00 to 65.00 Hz in steps of 0.01
Dropout level:
0.03 Hz
Level accuracy:
±0.001 Hz
Time delay:
0 to 65.535 s in steps of 0.001
Timer accuracy:
±3% of operate time or ±1/4 cycle (whichever is greater)
Operate time:
typically 4 cycles at 0.1 Hz/s change
typically 3.5 cycles at 0.3 Hz/s change
typically 3 cycles at 0.5 Hz/s change
Typical times are average operate times including variables such as frequency change instance, test method, and so on, and can vary by
±0.5 cycles.
OVERFREQUENCY
Pickup level:
20.00 to 65.00 Hz in steps of 0.01
