8 Rockwell Automation Publication 857-QS001B-EN-P - April 2017
Chapter 1 Overview
Firmware Compliance
The Settings files between major revisions of firmware are not compatible with
other major versions. This statement is true of products with version 10.xxx
firmware, version 12.xxx firmware, or higher.
Operating Safety
Protection Functions
The comprehensive protection functions of the relay (Tab l e 1) make it ideal for
utility, industrial, marine, and offshore power distribution applications.
Because the 857 Protection System is designed for global applications, it
includes both ANSI IEEE and IEC protective function numbers and
symbology.
IMPORTANT Do not load Settings file between relays of different version numbers.
ATTENTION: The terminals on the rear panel of the relay can carry
dangerous voltages, even if the auxiliary voltage is switched off. Do not place
a live current transformer secondary-circuit in an open circuit condition. The
disconnection of a live circuit can cause dangerous voltages! Any operational
measures must be conducted according to national and local directives and
instructions.
IMPORTANT Read the operation instructions before performing any operational
measures.
Table 1 - List of Protection Functions
IEEE/ ANSI Code IEC Symbol Function Name Note
25 df/dv Synchrocheck
27 U<
U<<
U<<<
Undervoltage protection
32 P<
P<<
Reverse power protection
37 I< Undercurrent protection
46R I
2
> Current unbalance protection - Feeder protective
mode
Only available when
application mode is
feeder protection.
46 I
2
> Current unbalance protection - Motor protective
mode
Only available when
application mode is
motor protection.
47 I
2
>> Phase reversal / incorrect phase sequence protection Only available when
application mode is
motor protection.
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