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This module is the main part of the equipment with reference to protection functions. The main functions are:
- Sampling of analog signals coming from magnetic module.
- Protection algorithm evaluation.
- Protection logic and auxiliary functions.
- Monitoring functions, events register, oscillography register, etc.
- Equipment self-check.
- Protection data communication to the communications CPU.
CPU module nucleus is a 16 bits microprocessor together with its auxiliary associated circuitry.
Communications CPU module nucleus is very similar to the protection CPU module, and it also consists of a 16 bits
microprocessor together with the auxiliary electronic.
The main function of the communications CPU module is to maintain and control the communications in the following
channels:
- Internal communication with the protection and control CPU modules.
- Local mode communication with a PC by the front communications port.
- Remote mode communication by rear communication port.
- Man-machine interface by means of keypads and displays (alphanumerical and graphical).
The design of the DTR has been done for assuring the maximum capacity of inputs by board, maintaining at the
same time the maximum reliability against electromagnetic disturbance.
Each of the board inputs has a resistive attenuate which adequates the external voltage battery levels (48 V, 125 V,
...) to the needs of the optocoupler that gives galvanic isolation to each input. As the majority of these inputs come
from elements that are connected to the substation equipment, together with the resistive attenuate one passive filter
is provided in order to get better behavior against electromagnetic perturbations.
Input modules (as well as the output ones), provide one selectable of 4 bits address, which allows to include several
modules of each kind in the same DTR unit.
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6. HARDWARE DESCRIPTION
DTR Digital Tap Changer Controller
6.1.6 PROTECTION CPU PROCESSING BOARD
6.1.7 CPU COMMUNICATIONS BOARD.
6.1.8 DIGITAL INPUTS BOARD.
GE—106305A
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