GE BUS1000 Instructions Manual page 11

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Requirements for Line Current Transformers
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Relation between the maximum and minimum C.T. ratios in all the positions connected to the
same bus ................................................. 10 maximum
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Minimum saturation voltage required for main C.T's (for IN = 5 amps)
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Intermediate Current Transformers: Normal ratios 5/2-1.33-1-0.5-0.2. Other ratios, including
multiple ratios are available according to application.
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Stabilization Resistance: 250 Ohms.
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Restraint Percentage: Adjustable form 0.5 to 0.8 in 0.1 steps
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Sensitivity: (for internal faults):
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Operation time (output relay included): Below 10 milliseconds
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Alarm Unit:
Operation threshold: 0.027 Amps.
Operation time: 10 Seconds.
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Short-circuit link for coupling currents: operation time adjustable between 100 and 1600
milliseconds.
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Line Trip Supervision Units (optional)
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Independent Units: Operation threshold between 0.2 and 3.3 amps
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Dependent units: Operation threshold between 25 and 100% of the breaker failure unit
adjustment.
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Breaker failure units (optional):
Operation threshold between 0.2 and 3.3 amps
Reset time below 12 milliseconds
Discrimination time between 100 and 730 milliseconds
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Infeed Source: 125 VDC. Amps systems consumption in mA.
Single bus system
Trip output (per position)
Supervision and breaker
Failure units (per position)
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Trip contacts:
Make and carry for trip cycle (according to ANSI C37.90)........30 amps
Break: Resistive 180 VA at 125/250 VDC.
Break: Inductive 60 VA at 125/250 VDC.
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Accuracy:
Operation current:
Operation time:
GEK-98514B
Adjustable form 0.2 to 2.0 amps
5%
5%
BUS1000 Busbar Protection
2. TECHNICAL SPECIFICATIONS
100 V
Normal
280
-
70
Tripped
670
65
140
2-3