The P632 differential protection device is intended for the fast and selective short-circuit protection of transformers, motors, generators and other installations with 2 windings.

The P632 provides high-speed three-system differential protection using a triple-slope characteristic and two high-set differential elements in combination with transformer inrush restraint, overfluxing 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.

Phase swapping allows motor / generator protection applications with enlarged protection zones.

In addition many supplementary protective functions are incorporated in 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 control functions are designed for the control of up to three electrically operated switchgear units equipped with plant status signaling and located in the bay of a medium-voltage substation (or a high-voltage station with basic topology). The P632 has almost 300 predefined Bay Types stored for selection and it is also possible to load user-defined bay templates.

The number of external auxiliary devices required is largely minimized by the integration of binary signal inputs operating from any auxiliary voltage, and versatile relay output contacts, by the direct connection option for current and voltage transformers, and by the comprehensive interlocking capabilities. This simplifies the handling of switch bay protection and control technology from planning to commission.

During operation, the user-friendly interface makes it easy to set the device parameters and allows safe operation of the substation by preventing non-permissible switching operations.

These features give the user the means to adapt the P632 to the protection and control capacity required in a specific application.

The powerful programmable logic provided by the protection device also makes it possible to accommodate special applications.

For a list of all available function groups see the Appendix.