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ABB
Transformer protection RET650
Product version: 1.1
Analog inputs
Table 2. Energizing inputs
Description
Rated frequency
Operating range
Current inputs Rated current, I
Thermal withstand
capability:
• Continuously
• For 1 s
• For 10 s
Dynamic current
withstand:
• Half-wave value
Input impedance
Voltage inputs Rated voltage, U
Voltage withstand:
• Continuous
• For 10 s
Burden at rated voltage
1) Residual current
2) Phase currents or residual current
Value
50/60 Hz
Rated frequency ± 5 Hz
1)
0.1/0.5 A
n
4 A
100 A
20 A
250 A
<100 mΩ
100 V AC/ 110 V AC/ 115 V AC/ 120 V AC
n
420 V rms
450 V rms
<0.05 VA
1MRK 504 127-BEN -
Issued: February 2011
2)
1/5 A
20 A
500 A
100 A
1250 A
<20 mΩ
39
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