DSDP150 57160001-GF industrial automation control module DCS PLC system
Technical data of product parameters
The apparent power component of DSDP150 57160001-GF the neutral power is monitored to detect E/F’s in ungrounded systems. Every feeder is
equipped with a relay. During an E/F, the capacitive E/F current
of the entire system less that of the faulted line flows into the
faulted line. Only the E/F relay of the faulted line indicates power
flowing into its line.
The minimum capacitive E/F current available to operate the
relays is the total capacitive E/F current of the DSDP150 57160001-GF whole system for
the smallest configuration to be expected less that of the faulted
line. Of this capacitive current, only the percentage corresponding to the assumed minimum displacement voltage at which the
protection is still required to operate may be considered. If there
are any double-circuit lines, the division of current between the
circuits must also be taken into account.
To allow for the c.t. errors at such low current levels, the pick-up
value set on the relay must be less than the product of the DSDP150 57160001-GF
minimum current determined above and the minimum voltage.
The parameter ‘Angle’ must be set to -90° pick up for E/F’s in the
forwards direction and 90° for the reverse directionWhere E/F and distance protections use the same communication channel, the transfer tripping schemes must be either both DSDP150 57160001-GF
permissive or both blocking. In the case of permissive schemes,
in which the distance protection operates with non-directional
criteria at one end for a weak infeed, a supplementary logic must
be enabled by appropriately setting the parameter ‘Single chan.’.
This supplementary logic interlocks the distance relay’s receive
signal at the end of the E/F function’s basic time or when it picks
up in the backwards direction. To this end, the signal ‘RecveInh’
is connected to the distance protection input ‘ExtBlkHF’. Thus
the communication channel is initially available for use by the
distance protection and only made available to the E/F protection
at the end of the basic time. The basic time setting must allow
adequate time for the distance protection to detect and clear a
fault if it can.
Product picture display
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