AB Crowell Y30232H00AA servo driver

AB Crowell Y30232H00AA servo driver

Technical data of product parameters

The purpose ofY30232H00AA se the power swing blocking function is to prevent
unwanted tripping of the distance protection function in response
to power system instability with oscillatory fluctuations of power
(power swings) or loss of synchronism (out-of-step). The power
swing blocking function does not influence the operation of the
back-up overcurrent function.
When power swings occur, the electrical parameters of the system vary at a slower or faster rate in relation to the angle Y30232H00AA se
between the voltage vectors of the energy sources in different parts
of the system. In the case of a fault on the other hand, step
changes of these parameters take place. The parameters, which
regardless of location are subject to appreciable variation in the
general region around phase opposition
A blocking signal is not issued, if the zero-crossings of the current signal occur at relatively irregular intervals, because considerable differences between the zero-crossing intervals are a Y30232H00AA se
clear indication of a fault on the power system. Phase jumps in
the current wave form occur at the incidence of a fault, as a
consequence of incorrect switching and when c.t. saturation
takes place. Since the currents during power swings are
sinusoidal and do not contain a DC component, it is permissible
to assume that the problem of c.t. saturation does not arise.
Zero-crossings resulting from the slip are in any event excluded
by the current enable setting of Imin. are the resistance R and the voltage component Y30232H00AA se
corresponds to the angle between phase voltage and current.The voltage and current input variables are passed on to the
evaluation system. The criterion for pick-up of the power swing
blocking function is the continuous variation of (U . cos
), which
corresponds to the variation of real power in relation to current
amplitude (P = I . U . cos
). The value of (U . cos
) is
determined after every zero-crossing of the current. A blocking
signal is generated, as soon as a repetitive variation of the value
of (U . cos
) is detected, i.e. a variation must be detected at
least three times to count as a power swing.
Two periods are needed to detect the faster power swings up to
a frequency of 8 Hz. The power swing blocking function does not
pick up during a fault, because the variation of (U . cos
) in
relation to time only occurs once and at a much higher rate than
the function’s operating range..

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