How is the rating of distribution substation decided?

How is the rating of distribution substation decided?

Substations have transformers to step down voltage. The rating of a substation is the MVA capacity of the transformers that are placed there. A substation has high rating, if the transformers in it are air blast cooled.

What is substation rating?

The transformer is the heart of the substation. For example, a typical substation transformer would be rated 69-13 kV and 20 MVA; meaning the primary or high voltage is 69 kV, the secondary or low voltage is 13 kV and the transformer has a power rating of 20 MVA or 20,000 KVA. …

How is substation capacity calculated?

Three Phase Example: Using a 75 KVA Three Phase Transformer as a starting point. 75 KVA is equal to 75,000 VA. (K= 1,000) The full value in VA, 75,000 divided by 1.732 = 43,302, which is then divided by the Voltage 208V = 208.2 Amperes. This is a “Three Step Division”, technique: VA / 1.732 / Voltage = Amperage.

How do I create a substation layout?

8 steps to follow in power substation design and engineering

  1. Step 1 – switching system. Selection of a substation switching system: ring bus, breaker-and-a-half, etc.
  2. Step 2 – key plan, location of components.

What are the three main parts of a substation?

Elements of a substation

  • Primary power lines.
  • Ground wire.
  • Overhead lines.
  • Transformer for measurement of electric voltage.
  • Disconnect switch.
  • Circuit breaker.
  • Current transformer.
  • Lightning arrester.

What is inside a mini substation?

Miniature substations generally consist of a steel enclosure housing an MV ring main switch, a step-down transformer with ratios typically 33000/420V, 22 000/420V or 11 000/420V and a low voltage distribution compartment.

How much does a substation transformer cost?

While the cost for one additional transformer foundation and appurtenant materials might cost about $150,000, the transformer itself might cost anywhere from $900,000.00 to $1,200,000.00 depending on it’s capacity.

What is the transformer substation?

an electric substation that steps up or steps down the voltage of an AC power system, and also distributes electric power. A transformer substation usually has one or two power transformers, distribution equipment, control and protective devices, and auxiliary equipment. …

How are substations classified?

The different types of substations mainly include Step-up Type Substation, Step-down Transformer, Distribution, Underground Distribution, Switchyard, Customer Substation, and System Station.

What is single line diagram of substation?

The single line diagram (SLD) is the most basic of the set of diagrams that are used to document the electrical functionality of the substation. Typically, single line or one line diagrams are used to document the configuration of the electrical high voltage circuit of a substation.

What are the ratings for a new substation?

The ratings apply to all new substations and the refurbishment of existing ones in or associated with the High Voltage Transmission Network. The scope of this document includes: • Defining the fault levels for substation maximum developments. • Defining the methodology for calculation of ratings for substation equipment.

What does the Powerlink substation ratings specification do?

This specification provides information for planning, calculating ratings, and operating the transmission system and sets standard for substation equipment ratings so that they meet immediate and long term network requirements. It applies to all high voltage substation plant owned and/or operated by Powerlink. 1.2 Scope

When did outdoor substation conductor ratings come out?

Outdoor Substation Conductor Ratings September 20, 2010 Rev 2 PJM Substation Conductor Ratings i Outdoor Substation Conductor Ratings Transmission and Substation Design Committee Substation Conductor Rating Task Force PJM Interconnection, LLC September, 2010 – Revision 2 PJM Substation Conductor Rating Task Force:

What do you need to know about transmission substations?

1.1 Transmission substations. Transmission substations integrate transmission lines into a network with multiple parallel interconnections, so that power can flow freely over long distances from any generator to any consumer. This transmission grid is often called the bulk power system.