This part of IEC 62257 provides a method for describing the results to be achieved by the 
electrification system independently of the technical solutions that could be implemented. 
The purpose of this part of IEC 62257 is to provide a method to assist project contractors and 
project developers to select and design the electrification system for isolated sites while 
matching the identified needs, such as those described in IEC TS 62257-2. IEC TS 62257-2 
assesses the needs of the users and the different power system architectures which can be 
used for meeting these needs. In relation to the needs of the different participants to the 
project, functional requirements that shall be achieved by the production and distribution 
subsystems are listed. 
In Clause 5, energy management rules to be considered are described. These are key issues 
as they have a great influence on the sizing of the electrification system. 
In Clause 6, the informations provided by the system sizing process to allow the participants 
to select the equipment or component able to fulfil the functional requirements are listed. 
To allow and facilitate the management of the micro-power plant and the maintenance of the 
whole electrification system, some information is collected and monitored.  
Clause 7 is dedicated to defining the parameters and specifying rules for data acquisition.dition 2.0 2015-12 TECHNICAL SPECIFICATION Recommendations for renewable energy and hybrid systems for rural electrification – Part 4: System selection and design IEC TS 62257-4:2015-12(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any