GE 850 - Page 308

6–40 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CURRENT ELEMENTS CHAPTER 6: PROTECTION SETPOINTS
Figure 6-14: Ground Directional Overcurrent Protection logic diagram
FLEXLOGIC OPERAND
FLEXLOGIC OPERAND
SETTING SETTING SETTING SETTING
SETTINGS SETTING SETTING
GROUND FUNCTION :
DIR OC
GROUND VOLT :
DIR OC POL
GROUND POLARIZING :
DIR OC
BLOCK:
GROUND LIMIT ANGLE :
DIR OC FWD
GROUND ECA:
DIR OC FWD
GROUND LIMIT ANGLE :
DIR OC REV
GROUND DIR OC FWD PICKUP : GROUND PICKUP :
DIR OC REV
Gnd Dir OC FWD
Gnd Dir OC REV
Disabled=0 Measured VX Voltage Calculated V_ 0
}
}
Current Ground Crt (Ig) K1-CT Crt (Ipol) Dual
NOTE:
CURRENT POLARIZING IS POSSIBLE ONLY IN RELAYS WITH
THE GROUND CURRENT INPUTS CONNECTED TO
AN ADEQUATE CURRENT POLARIZING SOURCE
Off=0 Enabled=1
AND
AND AND
AND
AND
AND
AND
OR OR
OR OR
Ipol 0.05xCT
Ig PICKUP
Ig PICKUP
Voltage Polarization
Current Polarization
-3V_0
3I_ 0
FWD
FWD FWD
REV REV
REV
RUN RUN RUN RUN
1.25 cy
1.5 cy
894157A2.cdr
TO GROUND TOC AND
IOC ELEMENTS
TO GROUND TOC AND
IOC ELEMENTS
AND
SETPOINTS
SIGNAL INPUT :
CT Bank 1 - J1
USED ONLY IN 845 and 889
SETPOINTS
POLARIZING VOL SUPV: lV_0I I ʅ0.005 x VT IVxI ʅ0. 005 x VT
USED ONLY IN 850