ANALYSIS ON THE IMPACT OF NEUTRAL POINT GROUNDING MODE TO RELAY PROTECTION SYSTEM ON 35kV NETWORKS OF NORTHERN POWER COMPANY CORPORATION

Abstract

Nowaday, there are many neutral grounding modes in medium voltage
distribution networks such as ungrounded neutral, solid grounding, grounding
via Petersen coil and grounding via impedance; Each has advantages and
disadvantages. The mode selection depends on technical, economical and safety
analysis. This paper present an overview of 35kV networks of Bac Ninh and Nghe
An. A detailed short circuit analysis is considered for 371E27.2 Bac Ninh in three
grounding modes and its impact on relay protection systems.