ABB RED670 Line Differential Protection 100% Brand New

The basic data of ABB RED670 Line Differential Protection:

Current Transformer Ratio 1:

• Ratio: 2000/5A
• CT Class: C800 (At max tap of 2000/5A)
• Secondary Resistance: 0.5 Ohm (2000/5A tap)
• Cable Loop Resistance: 2
• Max Fault Current: Equal to switchgear rated fault current 40 kA

Current Transformer Ratio 2:

• Ratio: 100/5 A (Note: Must be the same at all locations)
• CT Class: C200
• Secondary Resistance: 0.1 Ohms (At 100/5 Tap)
• Cable Loop Resistance: <100 ft AWG10 (one way between the junction point and the farthest CT) to be limited to approximately 0.1 Ohms at 75°C
• Max Fault Current: The maximum through fault current is limited by the reactor reactance and the inrush will be the worst for a reactor, for example, 800 A.

Current Transformer Ratio 3:

• Ratio: 600-300/5A A (Note: Must be the same at all locations)
• CT Class: C200
• Secondary Resistance: 0.66 ohms
• Cable Loop Resistance: <50 ft AWG10 (one way between the junction point and the farthest CT) to be limited to approx. 0.05 Ohms at 75°C gives loop resistance 2 x 0.05 = 0.1 Ohms
• Max Fault Current: The maximum through fault current is limited by the transformer reactance, use 15 x rated current of the transformer.