What are the requirements of good substation?
What are the requirements of good substation?
Requirements Of a Good Substation Earthing.
What are the basic requirements in site location of an electrical substation?
Substation should be away from airport and defence establishments. Water supply and sewage system are the two most important facilities to be given due consideration. The substation should be located far from the crowded places. Efforts are always made to locate transmission substations outside the city areas.
What is a substation layout?
Substations are the points in the power network where transmission lines and distribution feeders are connected together through circuit breakers or switches via busbars and transformers. The first step in designing a power substation is to design an earthing and bonding system.
How do you build a substation?
Steps
- Establish the work zone.
- Prepare the substation site.
- Excavate and lay the foundations.
- Install the grounding grid.
- Build the command building.
- Backfill the foundations and substation yard.
- Assemble the steel structures.
- Install the electrical equipment.
How many transformers are in a substation?
A transformer substation usually has one or two power transformers, distribution equipment, control and protective devices, and auxiliary equipment.
Why do substations need Stones?
Stones in the substation is provided to reduce the step potential and touch potential when operators work on switch yard. Step and touch potential occurs due to the short circuit current flows on the conductor. Therefore to provide the high resistance for foot and ground, the stones are provided.
What is the voltage at substation?
Substations: The electricity in homes is typically 120 volts (1 kV = 1,000 volts). When electricity moves from transmission lines to subtransmission lines to distribution lines, the voltage must be “stepped down” by transformers.
What are the components of substation?
All in all an electrical substation comprises of the following components:
- Lighting arresters.
- Conductors.
- Insulators.
- Instrument transformers.
- Electrical power transformers.
- Relays.
- Circuit breakers.
- Bus bars.
What type of earthing is found 11kV substation?
Pipe earthing is the most common type used for residential quarters and strip earthing is used for 11 kV substation.
What is the substation construction manual?
The Substation Construction Manual is not intended to replace Asset Management Standards, but rather to act as a reference document that cross-references existing Standards and Process Documentation and plug any gaps where Asset Management Documentation does not exist. 2. RESPONSIBILITIES
What are the subsubstation specifications?
Substation specifications in this guide are based on Indoor substations with standby equipment and UG cabling for ensuring service with minimum breakdowns to overcome the disadvantages of outdoor substations as: Outdoor substations are subject to dust, rain, storm, extreme heat and theft leading to breakdowns and higher maintenance.
What is the correct substation layout for dry transformers?
For example, with VCB HT Panel, dry transformers, the substation layout can be one hall. Fluctuating voltage is quite harmful to the substation equipment. As a standard practice if the supply voltage is less than 380 volts and more than 440 volts, the equipment should be shut down.
What is the weather like inside a power substation?
During winds, cyclones and storms, the entire distribution system including poles, and conductors collapse taking long time to restore the power supply. The indoor substations work at much lower ambient, say at 28 Degree C, when the outside temperature may be above 40 degree C.