Contents1. 650 series overview........................................................ 32. Application..................................................................... 33. Available functions..........................................................74. Differential protection....................................................145. Impedance protection.................................................. 146. Current protection........................................................ 157. Voltage protection........................................................ 168. Frequency protection....................................................179. Secondary system supervision..................................... 1710. Control........................................................................ 1711. Logic...........................................................................2012. Monitoring................................................................... 2113. Metering......................................................................2314. Human Machine interface............................................2315. Basic IED functions..................................................... 2416. Station communication................................................2517. Hardware description.................................................. 2718. Connection diagrams.................................................. 2819. Technical data.............................................................2920. Ordering for Customized IED.......................................6021. Ordering for Configured IED........................................ 6422. Ordering for Accessories............................................. 66DisclaimerThe information in this document is subject to change without notice and should not be construed as a commitment by ABB. ABB assumes no responsibility for any errorsthat may appear in this document. Drawings and diagrams are not binding.© Copyright 2013 ABB.All rights reserved.TrademarksABB and Relion are registered trademarks of the ABB Group. All other brand or product names mentioned in this document may be trademarks or registered trademarksof their respective holders.Transformer protection RET650 1MRK 504 137-BEN BProduct version: 1.32 ABB