Sices D-PRO, Technical Manual

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D-PRO Protection relay Technical Manual 35
It activates when the rotation sense of the genset phases does not comply with the one
configured in the parameter P.0328 (0=none, 1=clockwise, 2=counter-clockwise), with a filter
time configured with the parameter P.0329.
Type: Alarm
Measuring: IB0-IB1-IB2 Phase current low part
Iaux or Itor Auxiliary current or toroid current (50N)
Related parameters: P.0101 Genset phases number
P.0102 Genset rated voltage
P.0107 Genset rated current
P.0360 Current short circuit threshold (50)
P.0361 Current short circuit delay (50)
P.0362 Neutral current short circuit threshold (50N)
P.0363 Neutral current short circuit delay (50N)
P.0364 Short circuit threshold 50V (% restrained overcurrent)
P.0365 Short circuit delay (% restrained overcurrent)
To disable: P.0361=0; P.0363=0; P.0365=0
This protection intervenes as quickly as possible and it doesn't depend on timings of the curve
represented for maximum current protection. The protection is configured by setting a
threshold in P.0360, P.0362 and P.0364 expressed as percentage of the system rated current
(P.0107).
The protection is enabled only in case of absence of the disabling digital input (usually
combined to the circuit breaker status).
It activates if at least one current is higher than the threshold P.0360, P.0362 and P.0364
consecutively for the time configured in P.0361, P.0363 and P.0365.
Using the parameters P.0364 and P.0365, it is possible to configure the protection 50V . This
protection differs from the “normal” 50 because the threshold set in P.0324 is automatically
restrained when the genset voltage decreases. In detail:
o
If the generator voltage is higher than 80% the rated, the current threshold remains the
one set.
o
If the generator voltage is less or equal to 20% of the rated, the current threshold becomes
20% of the one set.
o
If the generator voltage is between 20% and 80% of the rated, the current threshold is
reduced in percentage.