Inter_lock_for__14.pdf

At each CCR, Transformer #1 or Transformer #2 can provide power to these units. As seen in Figure 2.4, there is an interlock between Power-I and Power-II. Power-

I is suppose to be fed from Transformer #1, while Power-II is suppose to be fed from

Transformer #2. Transformer #1 is providing power to both Power-I and Power-II.

Figure 2.4: Interlock between Power-I and Power-II at the CCR

The recommended setup is having Transformer #2 on and having it provide power to Power-II at the CCR and having Transformer #1 provide power to Power-I at the CCR.

Transformer #2 should be on to prevent moisture within the switchgear. The interlock at the Transformer #2 switchgear should be switched (see Figure 2.5). Therefore, Transformer #2 will be powering only Regulator Boards 4-6 and Transformer #1 will be powering only Regulator Boards 1-3. In turn, this will have Regulator Boards 1-3 feeding Power-I and Regulator Boards 4-6 feeding Power-II at the CCR.

Figure 2.5: Interlock at Transformer #2 Switchgear

Response to Q14 for RFP FA5209-16-R-0011