ABB PXAH401 3BSE017235R1 distributed base station controller

ABB PXAH401 3BSE017235R1 distributed base station controller

Technical data of product parameters

A delay function and a logic function are also included. The delay function enables a time to be defined between pick-up (I/P of
the function) and its operation. A setting is also provided for the
reset time. The logic function provides an AND, OR or RS gate
for combining different O/P signals (of functions and binaryA v.t. supervision feature (fuse failure) is already incorporated. PXAH401 3BSE017235R1
Its measurement can be based on either the zero-sequence
component (U0 . not I0) and/or the negative-sequence component (U2 . not I2). The latter is of special advantage in ungrounded systems or systems with poor grounding.
An independent back-up overcurrent function becomes a shortzone protection, as soon as the line isolator is opened. Tripping
of the overcurrent back-up protection is uninfluenced by any
signal, which may be blocking the distance protection (e.g. v.t.
supervision or power swing blocking).
The power swing blocking function monitors the variation of the
quantity U . cos
. This method of detecting power swings is entirely independent of the characteristic and location of the distance protection. Power swings with frequencies between 0.2 PXAH401 3BSE017235R1
and 8 Hz are detected.
The sensitive E/F protection for ungrounded systems and systems with Petersen coils measures both in the forwards and reverse directions. A characteristic angle of 90 (U0
chosen for ungrounded systems and one of 0 (U0
for systems with Petersen coils.
The distance protection function is equipped with overcurrent or
underimpedance starters. In ungrounded systems, all the usual
cyclic and acyclic phase preference schemes are available.
The residual (neutral) current and/or residual (zero-sequence)
voltage are monitored to detect earth faults.
The first distance zone, the overreaching zone and the reverse
zone measure simultaneously. All of the distance zones have
wide setting ranges and can be set completely independently of
each other, also with respect to whether they measure in the
forwards or reverse direction. There are three directional distance zones and a fourth, which can be either directional or nondirectional as demanded by the application. The overreaching PXAH401 3BSE017235R1
and reverse zones are for use in transfer tripping schemes with
signal transmission between the units at the two ends of a line.
The operating characteristics are polygons with the reactance
borders slightly inclined to give an ideal tripping area. For close
three-phase faults with very low voltages, the use of a reference
voltage comprising a healthy voltage and the voltage of a memory feature ensures a reliable directional decision.
Compensation of the mutual zero-sequence impedance of parallel circuits can be achieved by appropriate selection of the zerosequence impedance factor (k0) or the residual current of the
parallel circuit using k0m

Product picture display

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