Line differential丨REL561 1MRK002496-AC丨Distance protection termina

Line differential and distance protection termina
Line differential丨REL561 1MRK002496-AC丨Distance protection termina
Line differential丨REL561 1MRK002496-AC丨Distance protection termina
REL561 1MRK002496-AC

The main purpose of the REL 561 terminal is the protection, control and monitoring of overhead lines and cables in networks. Charging current compensation can be included in order to increase the sensitivity at high capacitive charging currents. It provides for one-, two-, and/or three-pole tripping. The true current differential protection provides excellent sensitivity and phase selection in complex network configurations. The REL 561 terminal is also specially suitable for series compensated networks.

The operation of a protection measuring function is influenced by distortion, and measures need to be taken in the protection to handle this phenomenon. One source of distortion is current transformer saturation. In this protection terminal, measures are taken to allow for a certain amount of CT saturation with maintained correct operation. This protection terminal can allow relatively heavy current transformer saturation.

Protection functions are also affected by transients caused by capacitive voltage transformers (CVTs) but as this protection terminal has a very effective filter for these transients, the operation is hardly affected at all

There are several different ways to specify CTs. Conventional magnetic core CTs are usually specified and manufactured according to some international or national standards, which specify different protection classes as well. However, generally there are three different types of current transformers:
• high remanence type CT
• low remanence type CT
• non remanence type CT

Line differential丨REL561 1MRK002496-AC丨Distance protection termina
REL551 1MRK002480-AE Line differential protection terminal