The unified protocols are unified in application interface, models, and seamless. They generate one
standard protocol, one world called IEC 61850. IEC 61850 integrate the security, interoperability,
modelling, mapping to a substation, and reliability. Presently, the more expensive fiber based Ethernet
LAN is the most prevalent technology for medium and low voltage distribution substations. To
circumvent this problem Wireless Local Area Network (WLAN) has been investigated for its suitability
for applications that are compliant to IEC 61850: automation and metering; control and monitoring; and
over-current protection. In this paper the IEEE 802.11n WLAN is studied when used in various IEC
61850 supported applications for substation automation. It also discusses the benefits of using GOOSE
message to protect and control applications and the use of IEC 61850.