Abb overcurrent relay manual

Understanding and testing the ABB RED Distance/Line Differential Relay 2 Preface This manual is an effort to facilitate the user in testing the ABB RED relay. It is assumed that the user of this manual is already familiar with the PCM software and hence, it is not addressing the configuration procedures in detail. series CN FP1, Feeder Protection Relay, Point List Manual, IEC These induction overcurrent relays are used to dis-connect circuits or apparatus when the current in them exceeds a given value. When no suitable sta-tion battery is available, the circuit opening type relay in conjunction with ac series trip coil is used to trip the circuit breaker. CONSTRUCTION AND OPERATION.

local ABB Inc. representative should be contacted. Printed in U.S.A. ABB H Effective: May Supersedes I.L. G, Dated June (|) Denotes change from superseded issue Type CO Circuit Opening Overcurrent Relay CONTENTS This instruction leaflet applies to the following types of circuit opening relays: Type CO-2 Short Time Relay. overcurrent relay. Accurate measurement, low transient overreach, high reset ratio and short reset time contribute to the use of short time steps and smaller margins for current settings in the selective plan. Overcurrent relay The start function is used to block other relays in the network or as an alarm. The. CO (HI-LO) Overcurrent Relay CONSTRUCTION AND OPERATION The type CO relays consist of an overcurrent unit (CO), either an Indicating Switch (ICS) or an ac Aux-iliary Switch (ACS) and an Indicating Instantaneous Trip unit (IIT) when required. ELECTROMAGNET The electromagnets for the types CO-5, CO-6, CO-.

The relay records the number of phase and earth fault trip events into dedicated trip counters. These trip counters can not be reset by the user and are. The Microshield O/C relay for three phase and ground overcurrent protection and optional circuit breaker auto-reclosing. The functions of the different switches are explained in detail in the user´s manual of the protection relay mod- ule SPCJ 4D Signal diagram. The figure.