The P632, a numerical device, is part of the MiCOM P30 family of devices. The device types included in this family are built from identical uniform hardware modules. The figure below shows the basic hardware structure of the P632.

External analog quantities and binary quantities – electrically isolated – are converted to the internal processing levels by the peripheral modules T, Y, and X.

The optional binary I/O modules X are equipped with optical couplers for binary signal input as well as output relays for the output of signals and commands or combinations of these.

The external auxiliary voltage is applied to the power supply module V, which supplies the auxiliary voltages that are required internally.

Analog data is transferred from the transformer module T via the analog bus module B to the processor module P. The processor module contains all the elements necessary for the conversion of measured analog variables, including multiplexers and analog/digital converters. The analog data conditioned by the analog I/O module Y is transferred to the processor module P via the digital bus module. The optional transient ground fault module N evaluates the measured variables according to the transient ground fault evaluation scheme.

The processor handles the processing of digitized analog variables and of binary signals, generates the protective trip and signals, and transfers them to the binary I/O modules X via the digital bus module. The processor module also handles overall device communication.

The optional communication modules provide one or two serial communication interfaces for the integration of the protection and control unit into a substation control system and for remote access respectively a protection communication interface for the transfer of digital information between two protection devices.

The local control module L is located behind the front panel and connected to the processor module via a ribbon cable. It encompasses all control and display elements as well as a PC interface for running the operating program S1.