LYD105A automation spare parts

LYD105A automation spare parts

Technical data of product parameters

This corresponds toLYD105A referred to the rated power PN of 100 VA.
A setting of 0.5 % PN is possible, but the accuracy of the c.t’s
must be checked before deciding whether such a sensitive setting is permissible. The real power can be increased by adding a
grounding resistor.The apparent power component of 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. LYD105A
The minimum capacitive E/F current available to operate the
relays is the total capacitive E/F current of the 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
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 direction.High-resistance earth faults, which cannot be detected by the
distance protection, can still cause appreciable problems in spite
of the relatively low fault currents involved.
The sensitive E/F protection function has been included to
complement the main line protection function and cover the low
E/F current range. The protection processes the zero-sequence
components 3I0 and 3U0Compared with integrated E/F and distance functions, the logic
in an independent E/F function needs certain starting and
tripping signals generated by the distance function and the E/F
protection is blocked in the following situations

Product picture display

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This article from the temporal Ming sheng automation equipment co., LTD.,

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