Seg HighTECH MRG3 - Page 5

Manual MRG3 SEG Electronics GmbH
DOK-TD-MRG3, Rev. D 5
6.7 Checking the external blocking and reset inputs .............................................................. 70
6.7.1 Test of the CB failure protection .................................................................................... 70
6.8 Primary injection test ......................................................................................................... 70
6.9 Maintenance ...................................................................................................................... 70
7. Technical data ............................................................................................ 71
7.1 Measuring input voltage .................................................................................................... 71
7.1.1 Influences on the voltage measurement ....................................................................... 71
7.2 Frequency measurement .................................................................................................. 71
7.2.1 Influences on the frequency measurement ................................................................... 71
7.3 Measuring input: phase current......................................................................................... 72
7.3.1 Influences on the current measurement ....................................................................... 72
7.4 Measuring input: Residual voltage .................................................................................... 72
7.4.1 Influences on the residual voltage measuring ............................................................... 72
7.5 Measuring input: Earth current .......................................................................................... 73
7.5.1 Influences on the earth current measuring ................................................................... 73
7.6 Common data .................................................................................................................... 74
7.7 Output relays ..................................................................................................................... 74
7.8 Setting ranges and steps .................................................................................................. 75
7.8.1 System parameter ......................................................................................................... 75
7.8.2 Parameter protection: Voltage, Frequency, df/dt protection ......................................... 77
7.8.3 Time over current protection ......................................................................................... 79
7.8.4 Earth fault supervision ................................................................................................... 80
7.8.5 Earth fault supervision with directional feature ............................................................. 81
7.8.6 Determination of the earth fault direction (MRG3-IER) ................................................. 81
7.8.7 Residual voltage protection ........................................................................................... 82
7.8.8 CB failure protection ...................................................................................................... 82
7.8.9 Interface parameter ....................................................................................................... 82
7.8.10 Parameter for the fault recorder ................................................................................ 83
7.8.11 Output relay ............................................................................................................... 83
7.8.12 Inverse time over current protection relay ................................................................. 84
7.9 Inverse time characteristics ............................................................................................... 85
8. Order form .................................................................................................. 88
Important Note!
The description “digital Multi-Function Relay MR” is part of the present description including those
chapters that are valid for all devices of this High Tech Line such as:
 Characteristics and features
 Technique of MR – Relays
 Operation and settings
 Housing
 Maintenance
 General technical data
Technical data subject to change without notice!