LYA210A communication card

LYA210A communication card

Technical data of product parameters

Phi is evaluated in relation to ‘TripAngle’ when one of the zones
has reached it number of slips, i.e. n
n1 or n2. LYA210A
For a setting of ‘TripAngle’ = 180°, the tripping command ‘Trip1’
and the signals ‘Trip1’ and ‘Trip2’ are issued immediately.
For a setting of ‘TripAngle’ = 0°, these signals are only issued
when the slip detector has reset, i.e. when the generator is again
close to synchronism with the power system.
A setting of ‘TripAngle’ between 180° and 0° (typically 90°) determines the rotor angle at which tripping takes place and the
signals are given. LYA210A
The setting at which tripping should take place is determined
according to an operating point which
occurs shortly after the last permissible slip
is favourable for the circuit-breaker (least stress due to reignition)
Typical setting: ‘TripAngle’ = 90°.
Settings: n1, n2, t-Reset
The number of slips n1 or n2 which may be considered permissible depends on the generator being protected and must be
stated by the manufacturer.
For settings of n1 and n2 1, the reset time ‘t-Reset’ can be set
to any low value. LYA210A
For settings of n1 or n2 > 1, ‘t-Reset’ must not be set lower than
the period 1/fS of the lowest slip frequency fS to be detected. Slip
frequencies from 0.2 Hz upwards are reliably detected using the
typical setting of 5 seconds.The sensitive E/F protection detects E/F’s on overhead lines in
radial systems. It is suitable for application in ungrounded systems, systems with Petersen coils and in resistance grounded
MV and HV systems. The scheme monitors the neutral voltage
and current of the protected line. Depending on the characteristic
angle chosen, it responds to either the real or apparent value of
the neutral power.The value entered for ‘P-Setting’ is the power at which the
function picks up referred to rated power ‘PN’. The parameter ‘PSetting’ has a setting range of 0.005 to 0.100 in steps of 0.001.
The setting of the parameter ‘Angle’ determines the characteristic angle of the measurement. Its implications are explained below under “Real power” and “Apparent power”.

Product picture display

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