LYA010A Hitachi DCS card

LYA010A Hitachi DCS card

Technical data of product parameters

When the impedance crosses the LYA010Aslip line between ZB and ZC it
counts as being in zone 1 and between ZC and ZA in zone 2. The
entire distance ZA-ZB becomes zone 1 when ‘EnableZone1’ is
enabled (external device detects the direction of the centre of
slipping).
After the first slip, the signals ‘Zone1’ or ‘Zone2’ and – depending
on the direction of slip – either ‘Generator’ or ‘Motor’ are issued.
Every time pole slipping is detected, the impedance of the point
where the slip line is crossed and the instantaneous slip frequency are displayed as measurements.Further slips are only detected, if they are in the same direction
and if the rate of rotor movement has reduced in relation to the
preceding slip or the slip line is crossed in the opposite direction
outside ZA-ZB.
A further slip in the opposite direction within ZA-ZB resets all the
signals and is then signalled itself as a first slip. LYA010A
The ‘Trip1’ tripping command and signal are generated after n1
slips in zone 1, providing the rotor angle is less than ‘TripAngle’.
The ‘Trip2’ signal is generated after n2 slips in zone 2, providing
the rotor angle is less than ‘TripAngle’.The rotor angle is given by the triangle bounded by the instantaneous impedance and the impedances ZA and ZB. The protection, however, measures the angle between the instantaneous
voltage and the rotor voltages EA and EB,
which closely approximates the impedance triangle.The setting for ‘WarnAngle’ can be set between 0° and 180° and LYA010A
determines the rotor angle above which alarm of imminent slipping is given.
With setting of ‘WarnAngle’ = 0°, alarm is given immediately the
rotor angle changes, providing it lies within the pick-up range.
‘WarnAngle’ enables the operating status of the generator to be
corrected, because its rotor angle setting is reached before the
first slip. The machine can normally be stabilised for rotor angles
up to 135°, for example, by changing the excitation or switching
in compensators.
For a setting of ‘WarnAngle’ = 180°, alarm is not given until the
first slip takes place, i.e. at the same time as the signal for zone

Product picture display

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