X
R
ArgDir
ArgNegRes
ZPE
ZRevPE
UL1
ϕ
IL
1
en06000470.eps
IEC06000470 V1 EN
Figure 73:
Simplified characteristic for offset mho in reverse direction for L1-to-
earth fault
7.1.6.5
Simplified logic diagrams
Distance protection zones
The design of the distance protection zones are presented for all measuring loops:
phase-to-earth as well as phase-to-phase.
Phase-to-earth related signals are designated by L1N, L2N and L3N. The phase-to-
phase signals are designated by L1L2, L2L3, and L3L1.
Fulfillment of two different measuring conditions is necessary to obtain the one
logical signal for each separate measuring loop:
•
Zone measuring condition, which follows the operating equations described
above.
•
Group functional input signal (STCND), as presented in figure
The ZMHPDIS function block is used in the IED for each zone.
The STCND input signal represents a connection of six different integer values from
Phase selection with load encroachment function FMPSPDIS within the IED, which
1MRK502052-UEN B
Section 7
Impedance protection
193
Technical manual
Summary of Contents for Relion REG670
Page 1: ...Relion 670 series Generator protection REG670 2 0 IEC Technical manual ...
Page 2: ......
Page 44: ...38 ...
Page 58: ...52 ...
Page 80: ...74 ...
Page 106: ...100 ...
Page 482: ...476 ...
Page 548: ...542 ...
Page 570: ...564 ...
Page 600: ...594 ...
Page 608: ...602 ...
Page 630: ...624 ...
Page 862: ...856 ...
Page 1094: ...1088 ...
Page 1226: ...1220 ...
Page 1250: ...1244 ...
Page 1297: ...1291 ...