Here are some extracts from ABB Library to get deeper information about theory, basic techniques, applications and case studies.
A complete paper about selectivity, including theory and basic techniques, with specific indications on the implementation of selectivity between ABB low voltage circuit-breakers.
A comprehensive description of the application area and the use of «D» directional protection and «SdZ» directional zone selectivity functions, with application references and examples.
A theoretical analysis of the possibilities of integration between ABB medium and low voltage protection trip units (in particular, MV REF542 and LV PR123), and an «how to make» section, with a description of the way to realize appropriate coordination and cabling with ABB devices.
Detailed information about the proper use and correct configuration of the PR223EF trip unit to obtain the maximum advantages in installations requiring zone selectivity.
Besides making available Zone Selectivity Interlocking (ZSI) for MCCBs, the PR223EF trip unit introduces a selectivity concept called Early Fault Detection and Prevention (EFDP). If logical selectivity operates in the range 1…10xIn, EFDP selectivity is usually active approximately in the range from 10xIn and the Icu of the circuit breaker.
A representative case: an Iraqi oil & gas company requiring technologically advanced solutions to provide total protection against earth faults in any point of the plant and guarantee selectivity between the MV and LV circuit-breakers.
Advanced protection systems against earth fault: all the information you may need about the normative aspects of protection against earth fault and indirect contact (definition, types of distribution systems and prescriptions as regards the protection
of human beings), ABB solutions (from RCDs to electronic trip units), and how to obtain selective coordination for the protection against earth faults.
Immediate-use and indispensable working tool, articulated into two parts:
enriched with tables for the quick choice of the protection devices for a wide range of installations and application examples.
An overview of the guidelines and requirements prescribed by the Standards for the design and construction of substations with installed power limited to 2000 kVA or two 1000 kVA MV/LV transformers.
Read more about the basic criteria for good protection of machines and plants in medium voltage networks.