Allen-Bradley Rockwell Automation 857 User Manual page 10

viii
Table of Contents
Chapter 10
Technical Data
857-UM001A-EN-P - July 2009
Connections .......................................................................... 10-1
Measuring Circuitry ....................................................... 10-1
Auxiliary Voltage ........................................................... 10-1
Digital Inputs .................................................................. 10-2
Trip Contacts .................................................................. 10-2
Alarm Contacts ............................................................... 10-2
Local Serial Communication Port .................................. 10-3
Remote Control Connection ........................................... 10-3
Arc Protection Interface (Option) .................................. 10-3
Tests and Environmental Conditions .................................... 10-4
Disturbance Tests ........................................................... 10-4
Test Voltages .................................................................. 10-4
Mechanical Tests ............................................................ 10-4
Environmental Conditions .............................................. 10-4
Casing ............................................................................. 10-5
Package .......................................................................... 10-5
Protection Stages .................................................................. 10-5
Non-Directional Current Protection ............................... 10-5
Overcurrent Stage I> (50/51) ................................... 10-5
Overcurrent Stage I>> and I>>> (50/51) ................. 10-6
Stall Protection Stage (48) ....................................... 10-6
Thermal Overload Stage T> (49) ............................. 10-7
Unbalance Stage I
Incorrect Phase Sequence I
Undercurrent Protection Stage I< (37) .................... 10-7
Unbalance/broken Connector Protection I
Earth Fault Stage I
Earth Fault Stage I
Circuit-breaker Failure Protection ........................... 10-9
Directional Current Protection ..................................... 10-10
Directional Overcurrent Stages I
Directional Overcurrent Stages I
I >>>> (67) ...................................................... 10-11
dir
Directional Earth Fault Stages I
Frequent Start Protection .............................................. 10-12
Frequent Start Protection N> (66) ......................... 10-12
Voltage Protection ........................................................ 10-13
Overvoltage Stages U>, U>> and U>>> (59) ........ 10-13
Undervoltage Stages U<, U<< and U<<< (27) ...... 10-13
Zero Sequence Voltage Stages U
Frequency Protection ................................................... 10-14
Overfrequency and Underfrequency Protection .... 10-14
Underfrequency Stages f< and f<< ........................ 10-15
Rate of Change of Frequency (ROCOF) Stage ..... 10-15
> (46) ......................................... 10-7
2
>> (47) ......................... 10-7
2
/I
2
> (50N/51N) ............................. 10-8
0
>>, I >>>, I >>>> (50N/51N) .. 10-9
0 0 0
> and I >> (67) . 10-10
dir dir
>>> and
dir
>, I >> (67N) ... 10-12
0ϕ 0ϕ
> and U >> (59N) .. 10-14
0 0
> (46R) 10-8
1