GASKET 1A4907 - Caterpillar

The Wye configurations and the Delta configurations are the most common generator lead connections. The following three phase connection diagrams illustrate the proper connection and lead identification for Wye configurations. Six Lead Wye Connection
Illustration 1 g00611486
Six Lead Wye Connection Diagram
Table 1
SIX LEAD WYE CONNECTIONS
Generator Lead Line Lead
T1 T1
T2 T2
T3 T3
Connect T4, T5, and T6 Neutral Voltage regulator sensing connections:
On medium voltage generators, sensing isolation transformers are used. The line lead's voltage connects to one side of the sensing isolation transformer. The voltage regulator connects to the other side of the sensing isolation transformers.
On generators up to 600 volts, the regulator leads are direct connected to the generator line leads and supply sensing voltage to the regulator. Twelve Lead Wye Connection (Series Wye)
Illustration 2 g01327247
Twelve Lead Wye Connection Diagram (High Voltage)
Table 2
TWELVE LEAD WYE CONNECTIONS (HIGH VOLTAGE)
Generator Lead Line Lead
T1 T1
Connect T4 and T7 -
T2 T2
Connect T5 and T8 -
T3 T3
Connect T6 and T9 -
Connect T10, T11, and T12 Neutral Twelve Lead Wye Connection (Parallel Wye)
Illustration 3 g00611608
Twelve Lead Wye Connection Diagram (Low Voltage)
Table 3
TWELVE LEAD WYE CONNECTIONS (LOW VOLTAGE)
Generator Lead Line Lead
Connect T1 and T7 T1
Connect T2 and T8 T2
Connect T3 and T9 T3
Connect T4, T5, T6, T10, T11, and T12 Neutral Six Lead Delta Connection
Illustration 4 g01327257
Six Lead Delta Connection Diagram
Table 4
SIX LEAD DELTA CONNECTIONS
Generator Lead Line Lead
Connect T1 and T6 T1
Connect T2 and T4 T2
Connect T3 and T5 T3 Voltage regulator sensing connections:
On medium voltage generators, sensing isolation transformers are used. The line lead's voltage connects to one side of the sensing isolation transformer. The voltage regulator connects to the other side of the sensing isolation transformer.
On generators up to 600 volts, the regulator leads are direct connected to the generator line leads and supply sensing voltage to the regulator. Twelve Lead Delta Connection
Illustration 5 g00611504
Twelve Lead Delta Connection Diagram
Table 5
TWELVE LEAD DELTA CONNECTIONS
Generator Lead Line Lead
Connect T1 and T12 T1
Connect T4 and T7 -
Connect T2 and T10 T2
Connect T5 and T8 -
Connect T3 and T11 T3
Connect T6 and T9 Neutral Generator line leads (T1 through T12) can be made of multiple cables. For example, three generator line leads might be designated as T4. Multiple line leads allow the lead to be flexible. Flexible leads help maintain the current carrying capacity which is required. If generator line leads are similarly marked, these leads should be connected together. These leads should be treated as one conductor. Generator line leads can terminate in the following ways:
End at the terminal strip (bus bar)
Fastened to other leadsFor more information, refer to Testing And Adjusting, "Leads - Connect".Depending on the connections that are made between the load and the generator line leads, single phase voltages and/or three phase voltages are possible.