Table 50. Three-phase current inrush detection (INRPHAR)
Characteristic Value
Operation accuracy At the frequency f = f
n
Current measurement:
±1.5% of the set value or ±0.002 × I
n
Ratio I2f/I1f measurement:
±5.0% of the set value
Reset time +35 ms / -0 ms
Reset ratio Typically 0.96
Operate time accuracy +30 ms / -0 ms
Table 51. Three-phase current inrush detection (INRPHAR) main settings
Parameter
Function Value (Range) Step
Start value INRPHAR 5...100% 1
Operate delay time INRPHAR 0.02...60.00 s 0.001
Table 52. Transformer differential protection for two-winding transformers (TR2PTDF)
Characteristic
Value
Operation accuracy At the frequency f = f
n
±1.5% of the set value or ±0.002 × I
n
Operate time
1)2)
Biased low stage
Instantaneous high stage
Typically 35 ms (±5 ms)
Typically 17 ms (±5 ms)
Reset time <30 ms
Reset ratio Typically 0.96
Retardation time <35 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Differential current before fault = 0.0 × I
n
, f
n
= 50 Hz. Injected differential current = 2.0 × set operate value
2) Includes the delay of the output contact value and f
n
= 50 Hz
Generator Protection and Control
1MRS757583 C
Product version: 1.3
34 ABB
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