This document provides instructions on how to prepare a single line diagram (SLD). It lists the necessary documents needed like the project technical specifications (PTS), protection requirements (PR), and pre- and post-bid clarification documents. It describes including feeders, remote ends, outgoing feeders, capacitor feeders, circuit breaker bays, and transformer bays on the SLD. The document provides notes on bays and their components. It also gives guidance on addressing questions that arise during pre-bid clarifications and modifying the SLD accordingly. Finally, it recommends starting with a reference design, customizing based on the PTS, manufacturer information, and bid clarifications.

1. How to prepare SLD
By : Ahmed Metwally

2. What is SLD

3. •
SLD
1-).
2- (Feeders) (Remote Ends) .
3- (Outgoing feeders).
4- (Capacitor feeders).
Sample

4. How to prepare SLD
PTS (Project Technical Specifications)
PR (Protection Requirements)
Post-pid clarification
DocumentsnecessarytopreparetheSLD
GIS base design (if possible)
Pre-pid clarification
SWGR base design (if possible)
List of manufacturers

5. •
• SLD
PTS
1-).
2- (Feeders) (Remote Ends) .
3- (Outgoing feeders).
4- (Capacitor feeders).
5- (CB) (Earth switch) Bay.
6- Tender SLD SLD
SLD PTS .
Sample

6. Note
Bay: group of C.B’s, CT’s, VT’s, E.S’s & D.S’s which is
responsible for a certain task.
.
Transformer bay:
CB (D.S’s) (E.S’s) (CT’s) (VT’s)

7. Bay .
Protection & Metering SLD SLD .
PR (Protection Requirements)
Sample

8. • .
• :-
Pre-Pid Clarrifications:
Q: All D.S’s will be 3 positions?.
.
SLD 3 position SLD SLD.
Ans: Confirmation.

9. .
Post-pid Pre-pid :-
Post -pid Clarrifications:
15 VA 25 VA PR PTS.
rating VT calculations Pre-pid 15 VA 25 VA.
Q: VT rating will be 15 VA instead of 25 VA.
Ans: It must satisfy VT requirements.

10. GIS GAS INSULATED SWITCHGEAR
SWGR
Manufacturer GIS
GIS base design
CB
Sample

11. Manufacturer SWGR
SWGR base design
CB
BUS SECTION
BUS DUCT
Sample

12. Note
GIS , SWGR BASE DESIGN MANUFACTURER List of
manufacturers
Sample

13. HOW CAN I START WORK
1-Choose a reference project of the same manufacturers
2-Change the title block of s/s and DWG no as per DTS
3- Modify the DWG as per PTS and tender SLD
4- Modify the DWG as per Post bid and Pre bid
5- If you received manufacturer base design Modify the DWG as per
base design for points you agree and give your comments about
any thing represents contradiction between base design and
PTS,Post bid , Pre bid

14. Behind the submittal
Read about CB types (SF6, Vacume , …. Etc)
Explain transformer connection , vector groups , ventilation
Tap changers (types, construction and how it works)
How to select CT ( ratio , class,mag curve , ….)
Bus bar types , materials , selection

15. QUESTIONS??

16. THANKS