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Salem 2013 SRO CERT
4KV Objectives Study Guide
10
Other
Professional
07/20/2013

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Term
4KV Purpose
Definition

Provides Power to 4KV motors, 480 and 230 distribution systems via stepdown transformers necessary for:

1. Normal Plant operation

2. Safe Sutdown for the following conditions: Normal,Transient,Accident

Term
4KV Design Basis
Definition

Capable of being safely shutdown from full power in the event of loss OSP.

 

Total loss of onsite and offsite AC power is NOT a design basis.

Term
Which SPTs feed the 4KV group buses?
Definition

1H and 1E fed from 11 SPT,

1F and 1G fed from 12 SPT,

2H and 2E fed from 21 SPT,

2F and 2G fed from 22 SPT

Term
Under normal opertaion, how do the 4KV group buses receive power?
Definition
The group buses are typically fed through thier respective APTs.
Term
What SPTs feed the 4KV vital buses?
Definition
13 SPT, 14 SPT, 23 SPT and 24 SPT
Term
Typical breaker lineup of 4KV vital buses are:
Definition

2 infeed breakers from 1 SPT and

1 infeed breaker from the other SPT

 

14 SPT feeds 14 BSD and

14 CSD and 13 SPT feeds 13 ASD

Term

During a loss of power from 24 SPT,

what is the normal lineup of the CW breakers?

Definition

24CW9AD is open

2CW2BD is closed

23CW1AD is closed

 

The 460/240V CW bus that feeds the travelling screens would be lost in this situation.  Thus, the need for the cross tie breaker to close.

Term
Describe a manual transfer from one 4KV infeed breaker to the other 4KV infeed breaker.
Definition

Close command given to the open breaker.

Clsed breaker receives open signal and opens.  Upon opening, the bus deenergizes past 35%, allowing the desired breaker to close. 

Term

What are the 2 types of undervoltage relays

and what are their setpoints?

Definition

UV = less than 70%

Degraded voltage relay = 95.1

Term
To swap from one 4KV infeed breaker to another, Bus transfer interlock must meet what % undervoltage before breaker closure?
Definition
35%
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