40AO-9ZZ12 Degraded Electrical Power

Question 1

What are the entry conditions for Degraded Electrical Power (40AO-9ZZ12)?

Answer 1

• Loss of any bus ≥ 480v no LOOP or SBO
• Loss of any bus ≥ 480v no LOOP or SBO and power restoration desired DURING EOP’s
• Any board dark after EOP’s

Question 2

During Loss of any bus ≥ 480v no LOOP or SBO when would you bypass all parameters on a PPS channel?

Answer 2

• Loss of PBA/B
• 90 minutes elapsed
• parameter NOT bypassed on other channels

Question 3

During Loss of any bus ≥ 480v no LOOP or SBO and LOP (PB) and DG breaker fails to automatically close occurred what actions are taken?

Where are these actions found?

Answer 3

Ensure:

• Frequency 59.9 - 60.5Hz
• Voltage 4180 - 4300 V
• Norm/ Alt Brkr OPEN and no faults
• Check DG LO relay not actuated
• Manually close DG brkr
• If unable to energize bus Emergency Stop DG

SPTA’s - Hard Card
AOP - AOP guidance

Question 4

How do Foxboro controllers FAIL?

How do the respond when restored?

Answer 4

• Fails with 0 output

- Restores to MAN with 0 output

Question 5

What MCC supports the SBOG’s and what is its power source?

Answer 5

• M56
• NAN-S06 Norm
• NAN-S05 Alt

Question 6

What are the ratings of the SBOG’s and what affects their max loading?

Answer 6

• 3400 kw at 122°F
• Affected by ambient temperature
• Cable limits to 6000 kw

Question 7

When would you perform 40ST-9ZZ37 inoperable power sources?

Answer 7

Loss of:

• NAN-S03
• NAN-S04
• NAN-S05
• NAN-S06
• PBA
• PBB

Question 8

What is the concern when restoring power to NAN-S01 and why?

Answer 8

• Trips ANY running MFP

Loss of power to:

• NQN-D02
• LON-C01
• LON-C02
• I&C support needed

Question 9

While restoring power, when would you coordinate with the ECC?

Answer 9

• S/U XFMRS

Question 10

While restoring power, when would you coordinate with RW

Answer 10

• L05

- L16

Question 11

While restoring power, when would you coordinate with WRF?

Answer 11

• U1 NAN-S05

- U1 NAN-S06