GE Multilin
B90 Low Impedance Bus Differential System
3-11
3 HARDWARE
3.2 WIRING
3
An LED on the front of the control power module shows the status of the power supply:
Figure 3–11: CONTROL POWER CONNECTION
3.2.4 CT AND VT MODULES
Information on the CT and VT modules for the B90 relay is shown below.
Verify that the connection made to the relay nominal current of 1 A or 5 A matches the sec-
ondary rating of the connected CTs. Unmatched CTs may result in equipment damage or inad-
equate protection.
Each AC current input has an isolating transformer and an automatic shorting mechanism that shorts the input when the
module is withdrawn from the chassis. There are no internal ground connections on the current inputs. Current transform-
ers with 1 to 50000 A primaries and 1 A or 5 A secondaries may be used.
Each B90 voltage input is intended for monitoring a single-phase voltage. The may include phase voltages or neutral volt-
age from the open-delta VT.
All CT and VT modules are available with enhanced diagnostics. These modules can automatically detect CT/VT hardware
failure and take the relay out of service.
Substitute the tilde “~” symbol with the slot position of the module in the following figure.
LED INDICATION
POWER SUPPLY
CONTINUOUS ON
OK
ON / OFF CYCLING
Failure
OFF
Failure
AC or DC
NOTE:
14 gauge stranded
wire with suitable
disconnect devices
is recommended.
Heavy copper conductor
or braided wire
Switchgear
ground bus
UR-series
protection system
FILTER SURGE
–
+
LOW
+
HIGH
B8b B8a B6a B6b B5b
CONTROL
POWER
827247A1.CDR
NOTICE
NOTE
Summary of Contents for B90
Page 10: ...x B90 Low Impedance Bus Differential System GE Multilin TABLE OF CONTENTS ...
Page 284: ...5 166 B90 Low Impedance Bus Differential System GE Multilin 5 8 TESTING 5 SETTINGS 5 ...
Page 334: ...10 8 B90 Low Impedance Bus Differential System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Page 338: ...A 4 B90 Low Impedance Bus Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 460: ...C 30 B90 Low Impedance Bus Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 476: ...E 10 B90 Low Impedance Bus Differential System GE Multilin E 1 IEC 60870 5 104 APPENDIX E E ...
Page 502: ...viii B90 Low Impedance Bus Differential System GE Multilin INDEX ...