GE IS220PDIAH1B industrial automation control module DCS PLC system
Technical data of product parameters
The display of the measured variable IS220PDIAH1B in the case of the underreactance protection is an impedance vector which starts at the
centre of the circular characteristic. This vector and the vector of
the impedance measured at the generator terminals form a triangle as shown in Fig. 3.5.14.5. The protection picks up, if the
displayed impedance equals or is less than the radius of the circle:defines the analogue c.t. input channel.
All current I/P’s may be selected.
In the case of multi-phase measurement, the first channel of
the group of three selected must be specified. The other
phases are derived from the same group.The power function is connected to the phase currents and aIS220PDIAH1B
phase-to-neutral or phase-to-phase voltage. The purpose of the
phase compensation is twofold:
to compensate the phase difference between the phase voltage and the any measured phase-to-phase voltage
to determine whether the function responds to active or reactive power.
The following table summarises the most important operating
modes to simplify setting the corresponding parameters correctly. The angles given apply for connection according to IS220PDIAH1B
Section 4.4.2.
The phase compensation also provides facility for changing the
direction of measurement or to compensate incorrect v.t. or c.t.
polarity.This setting is for correcting the phase error between the v.t’s
and c.t’s, which have a considerable adverse influence on the
measurement of active power at low power factors.The total error corresponds to the difference between the v.t.
and c.t. errors. The case considered in this example of full reactive current (100%) would scarcely occur in practice, but currents
from about 80% are possible.
Product picture display
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