GE B30 Instruction Manual page 65
Bus differential system, ur series
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- Instruction manual (633 pages) ,
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3 HARDWARE
The above modules are available with enhanced diagnostics. These modules can automatically detect CT/VT hardware
failure and take the relay out of service.
CT connections for both ABC and ACB phase rotations are identical as shown in the Typical wiring diagram.
The exact placement of a zero-sequence core balance CT to detect ground fault current is shown below. Twisted-pair
cabling on the zero-sequence CT is recommended.
Figure 3–14: ZERO-SEQUENCE CORE BALANCE CT INSTALLATION
The phase voltage channels are used for most metering and protection purposes. The auxiliary voltage channel is used as
input for the synchrocheck and volts-per-hertz features.
Substitute the tilde "~" symbol with the slot position of the module in the following figure.
NOTE
GE Multilin
UNSHIELDED CABLE
Ground connection to neutral
must be on the source side
Source
A
B
C
N
G
Ground
outside CT
LOAD
Current inputs
8F, 8G, 8L, and 8M modules (4 CTs and 4 VTs)
Current inputs
8H, 8J, 8N, and 8R modules (8 CTs)
Figure 3–15: CT/VT MODULE WIRING
B30 Bus Differential System
SHIELDED CABLE
Stress cone
Source
shields
A
B
C
To ground;
LOAD
must be on
load side
996630A5
Voltage inputs
842766A3.CDR
3.2 WIRING
3
3-13
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