ABB RELION REX640 Technical Manual page 1404

Protection and control

Hide thumbs Also See for RELION REX640:

Table of Contents

Condition monitoring functions

Function block

Figure 795: Function block

Functionality

The Diesel generator monitoring and protection DGMGAPC function protects

industrial power plants and vessels from faults which are not easily detected by

normal protection functions. The most important of such faults are the over/under

fueling of diesel engines and over/under excitation of generators.

DGMGAPC protects the generators in isochronous load sharing, droop load sharing

and base load modes. The function performs topology determination to identify the

components connected in its own electrical network and exchanges relevant data

with all other relays having DGMGAPC function and present in the same IEC61850

The DGMGAPC identifies a fault in the generator by comparing its behavior to its

current governor mode or with reference to other generators in the network. When a

fault is detected, the function will signal the fault to the Power Management System

(PMS). If the fault condition deteriorates, the function issues commands to stop the

engine or to de-excite the generator. It then issues a trip command to the Generator

Circuit Breaker (GCB).

1MRS759142 F

Technical Manual