PD IEC/TS 62257-9-1:2016

What is PD IEC/TS 62257-9-1 about?

The IEC 62257 series is a European standard that covers various aspects of recommendations for renewable energy and hybrid systems for rural electrification.

PD IEC/TS 62257-9-1 is the first part of the IEC 62257 series that specify Decentralized Rural Electrification Systems (DRES) are designed to supply electric power for sites that are not connected to a large interconnected system, or a national grid, in order to meet basic needs.

The majority of these sites are

• Isolated dwellings
• Village houses
• Community services (public lighting, pumping, health centres, places of worship or cultural

activities, administrative buildings, etc.)

• Economic activities (workshops, micro-industry, etc.)

The DRESs fall into the following three categories:

• Process electrification systems (for example, for pumping)
• Individual electrification systems (IES) for single users
• Collective electrification systems (CES) for multiple users

Process or individual electrification systems exclusively consist of two subsystems:

• An electric energy generation subsystem
• The user's electrical installation.

Collective electrification systems, however, consist of three subsystems:

• An electric energy generation subsystem
• A distribution subsystem, also called microgrid
• User’s electrical installations including interface equipment between the installations and

the microgrid

Who is PD IEC/TS 62257-9-1 for?

PD IEC/TS 62257-9-1 on renewable energy and hybrid systems for rural electrification is useful to:

• Rural electrification projects developers and manufacturers
• Rural electrification project implementers
• Rural electrification project contractors
• Rural electrification project supervisors
• Rural electrification installers
• Test in laboratories developing countries

Why should you use PD IEC/TS 62257-9-1?

Photovoltaic hybrid power systems are gaining attraction among rural electrification institutions as a way to reduce fuel price rises, produce lower operating costs, and provide improved service quality than traditional single-source generating systems.

Guidance in PD IEC/TS 62257-9-1 can help you establish the various best industry requirements for decentralized rural electrification systems that are intended to provide basic necessities by supplying electric power to areas that are not connected to a large interconnected system, or a national grid.

PD IEC TS 62257-9-1 provides you guidance on renewable energy and hybrid systems for rural electrification products in terms of selecting the correct system for the right area, designing the system, and operating and maintaining the system.

Adopting guidance in PD IEC TS 62257-9-1 can be helpful for the safety, sustainability of systems and at the lowest life-cycle cost possible. PD IEC TS 62257-9-1 assist in promoting the use of renewable energies in rural electrification for developing countries.

What’s changed since the last update?

PD IEC/TS 62257-9-1:2016 supersedes DD IEC/TS 62257-9-1:2008 which is withdrawn. PD IEC/TS 62257-9-1:2016 includes some technical changes with respect to DD IEC/TS 62257-9-1:2008. These include:

• Changing the voltage range covered by the technical specification to a.c. nominal voltage below 1 000 V and d.c. nominal voltage below 1 500 V (introduction)

• Defining the rating of the microgrids to be the output of the microgrid (introduction)
• Including 240 V 1-Ø/415 V 3-Ø, in the voltage levels (introduction)
• Specifying Non-separated MPPTs connecting LV d.c. arrays to ELV d.c. battery banks are

not allowed (5.3.1.1)

• Noting that systems can now include a.c. bus arrangements and use MPPT's as the solar

controllers thus increasing the internal voltages that occur in systems (5.3.1.2)

• Increased equipotential bonding for lightning protection from minimum 10 mm2 to minimum 16 mm2 (6.1.2.2)