Description

Schneider MiCOM P634 Numerical Relay

The P634 differential protection device is intended for the fast and selective short-circuit protection of transformers, motors, generators and other installations with 4 windings. The Schneider MiCOM P634 Numerical Relay provides high-speed three-system differential protection using a tripleslope characteristic and two high-set differential elements in combination with transformer inrush restraint, over-fluxing restraint and through-stabilization. Amplitude and vector group matching is done just by entering the nominal values of transformer windings and associated current transformers. An (optional) overreaching current measuring circuit monitoring function will prevent unwanted tripping by differential protection for faults in the CT’s secondary circuit. For ring bus and breaker-and-a-half applications, a virtual winding can be defined for which the current measuring inputs are based on the vector sum of currents from two or three freely selectable windings.
Phase swapping allows motor/generator protection applications with enlarged protection zones. In addition, many supplementary protective functions are incorporated into the devices. These can be individually configured and cancelled. The relevant protection parameters can be stored in four independent parameter subsets in order to adapt the protection device to different operating and power
system management conditions. The powerful programmable logic provided by the protection device also makes it possible to accommodate special applications.

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