GAS INSULATED SUBSTATION INSTALLATION PLANNING BASIC AND TUTORIALS

A deliberate and complete installation plan, including the future addition of similar equipment, is essential so that all aspects of construction can be reviewed.

The preassembled sections of the equipment and the manufacturer’s instructions dictate the assembly sequence and, in most instances, follow a series of steps categorized as follows:

a) Preconstruction meeting between the user and the manufacturer
b) Site preparation including grading; installation of drainage, foundations, and grounding mats; access roads; and auxiliary power
c) Staging of construction equipment required during the installation
d) Final alignment and leveling of foundation supports
e) Receiving, unloading, and storing GIS equipment
f) On-site assembly
g) Leak testing
h) Connection of control wires
i) Purging and filling with insulating gas
j) Mechanical or operational testing
k) Dielectric testing
l) Cleanup in accordance with applicable regulations
m) Energization

Other planning considerations are as follows:

- A schedule for work crews should be prepared to provide for more economical use of manpower and to minimize conflicts caused by limited space. Scheduling may also result in the release of specialized skills in the shortest possible time.

- On-site or nearby preassembly areas should be planned when practical so that specialized equipment can be set up and repetitive assembly tasks can be performed under controlled conditions.

- A site layout designating erection equipment locations should be prepared to allow maximum use of the equipment with minimum movement. The layout should include details for each phase of installation so that orderly movement of the equipment can be maintained.

- The capacity of cranes, hoists, gas-handling equipment, welding equipment, etc., should be considered to ensure that the proper size equipment is available for the job.

- Electric power, heat, water, etc., should be available at the appropriate time in the installation sequence.

- The suitability of the site for each phase of construction and installation should be planned in advance (e.g., to move about the work area requires proper ground preparation).

- Cleanliness, in accordance with manufacturer’s instructions, should be observed at all times.

- Material safety data sheets and other health and safety information should be readily available to the work crews.

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