GE F650 - Page 211

5-64 F650 Digital Bay Controller GEK-106310AB
5.4 PROTECTION ELEMENTS 5 SETTINGS
5
Polarization magnitudes can be, as in the case of 67N, Polarization voltage (3Vo), either calculated from the phase
voltages or measured from terminals A11-A12, or polarization current (Ip), measured from the fifth input transformer
terminals, Isg, terminals B11-B12.
The following table shows the used magnitudes in each of the Polarization possibilities:
Table 5–55: USED MAGNITUDES ACCORDING TO THE POLARIZATION SETTING
The following table shows the management of the element output signals (block and permission) depending on the
Polarization Type setting.
Table 5–56: OUTPUT SIGNALS MANAGEMENT ACCORDING TO THE POLARIZATION TYPE SETTING
The configuration of the signals required for blocking the Ground overcurrent elements from the signals provided by the
Ground directional element is made at Setpoint > Relay Configuration > Protection Elements using inverted operation
signals to block the trip.
For example, to block the ground time delayed elements:
GROUND TOC1 BLOCK = NOT (GROUND DIR1 OP)
GROUND TOC2 BLOCK = NOT (GROUND DIR2 OP)
GROUND TOC3 BLOCK = NOT (GROUND DIR3 OP)
To block the Ground Instantaneous elements:
GROUND IOC1 BLOCK = NOT (GROUND DIR1 OP)
GROUND IOC2 BLOCK = NOT (GROUND DIR2 OP)
GROUND IOC3 BLOCK = NOT (GROUND DIR3 OP)
POLARIZATION SETTING OPERATION MAG. POLARIZATION MAG.
Vo Ig 3V0
Ip Ig Isg
Vo + Ip Ig 3V0 or Isg
Vo * Ip Ig 3V0 and Isg
POLARIZATION SETTING GROUND DIR BLOCK SIGNAL GROUND DIR OP SIGNAL
Vo V
0
< Ajs. POL V THRESHOLD Permission V
0
Ip I
P
< 5 mA Permission I
P
Vo + Ip V
0
< POL V THRESHOLD
I
P
< 5 mA
Permission V
0
Permission I
P
Vo * Ip V
0
< POL V THRESHOLD
I
P
< 5 mA
Permission V
0
Permission I
P