R
Offset
Z1 or Z2
XoffsetZ1
Z1diameter
Z (apparent impedance)
Z1 = Z - (Xof
Z1diameter/2)
en06000456-2.vsd
IEC06000456 V2 EN
Figure 121:
Zone measurement in LEXPDIS protection function
The impedance Z1 is constructed from the measured apparent impedance Z and the
impedance corresponding to the centre point of the impedance characteristic (Z1 or
Z2). If the amplitude of this impedance is less than the radius (diameter/2) of the
characteristic, this part of the protection will operate.
If the directional restrain is set Off the impedance zone operation will start the
appropriate timer and LEXPDIS will trip after the set delay (
tZ1
or
tZ2
).
If the directional restrain is set On the directional release function must also operate
to enable operation. A new impedance is constructed from the measured apparent
impedance Z and the
XoffsetDirLine
point on the y-axis. If the phase angle of this
impedance is less than the set
DirAngle
LEXPDIS function will be released, see
figure
1MRK502052-UEN B
Section 7
Impedance protection
277
Technical manual
Содержание Relion REG670
Страница 1: ...Relion 670 series Generator protection REG670 2 0 IEC Technical manual ...
Страница 2: ......
Страница 44: ...38 ...
Страница 58: ...52 ...
Страница 80: ...74 ...
Страница 106: ...100 ...
Страница 482: ...476 ...
Страница 548: ...542 ...
Страница 570: ...564 ...
Страница 600: ...594 ...
Страница 608: ...602 ...
Страница 630: ...624 ...
Страница 862: ...856 ...
Страница 1094: ...1088 ...
Страница 1226: ...1220 ...
Страница 1250: ...1244 ...
Страница 1297: ...1291 ...