Term
500KV Elecetrical System
Purpose |
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Definition
a. Receive 500 KV generated power via two banks of 3 ,single phase step up Transformers and transmit this power over 3 transmission lines.
b. Provide offsite power to each units auxiliaries and to each units protection system and safety systems during abnormal and accident conditions. via: 13KV-4KV step down Station Power Transformers. |
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Term
| 3 transmission lines connected to te 500 KV Ring bus |
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Definition
1. Hopecreek
2. New Freedom
3. Orchard(Dean) |
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Term
| How many bus sections are in the 500 KV system and how are they connected? |
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Definition
7 Bus sections:
Bus sections 1 and 2 connect the other sections in a ring bus formation and connect the 1,2,3,4 SPT to the 500KV system. The SPT step down the 500 to 13 KV. |
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Term
| How many Breakers are in the 500 KV ring bus and what sections do they connect? |
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Definition
8
2-6, 2-8, 2-10
5-6, 9-10
1-5, 1-8, 1-9 |
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Term
| Which Breakers can be controled by the dispatcher remotely? |
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Definition
The Breakers that isolate the outgoing and incoming Transmission Lines:
2-10, 2-8, 2-6
5-6, 1-8, 9-10 |
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Term
Breaker position during full operation?
Single Unit operation?
Single unit operation with drops disconnected? |
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Definition
All 500KV breakers closed
Output breakers open all others closed
All 500KV breakers closed
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Term
| Describe "Breaker and a half Scheme" |
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Definition
| 3 Breakers protecting 2 Lines or Sections |
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Term
| Name the output breakers for unit 1 MPT and Unit 2 MPT |
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Definition
Unit 1: 5-6, 1-5
Unit 2: 9-10, 1-9 |
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Term
| 500 KV Breaker description |
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Definition
| SF6 Arc suppressing gas filled with 2 interupting heads |
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Term
| Name 4 circuit switchers and their operation |
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Definition
1T60 2T60 3T60 4T60
Remotely and automatically isolates high side of the SPT upon a low side bus ground fault.
Circuit switchers have both cicuit interupters and automatic diconnect features. |
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Term
| 500 KV related Tech Specs |
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Definition
3.8.1.1 AC Sources- Operating:
LCO: a. 2 independent sources of OSP
b. 3 seperate EDG with seperate day tanks min of 130g of fuel and a common FOST min volume of 23000g and 2 FTPs
3.8.1.2 AC Sources -Shutdown:
LCO: 1 source of OSP and 2 EDG and 1 FTP |
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