CT Installation: Components, Classifications, and Features

Posted on Mar 31, 2025 in Technology

CT installation is provided with one or more processors, reducing high and low voltage switchgear and working with precise complementary functions. The function of a CT is to distribute electricity to different voltages while simultaneously allowing the connection to lines and networks at any point. CTs are classified in five ways:

Classification by Food (Supply)

  • In Point: There is only one supply line connected to the derivation of the main network.
  • In Step: Has one input and one output line to another center.

Classification by Ownership

  • Business: Ownership of the company, leaving the network in.
  • Subscriber Bt: Ownership of the customer, conditioned by the alimentation network supplier.

Classification by Location

  • Weather (Outdoor): Transformer consisting of less than 160KVA protected by fuses.
  • Interior (Indoor): Located indoors, can be surface or groundwater.

Classification by Connection

  • Air or groundwater.

Classification by Civil Work

  • Conventional: Located inside enclosures.
  • Precast: Inside the factory, already providing echo things.
  • Compact: Can be half-buried or surface.
  • Maneuver: For MT network, monoblock structure, installation surface. Carries 3 cells.

The Switchgear CT

The switchgear CT is formed by: cell line, cell protection, cell processor, which houses the power transformer. Smeared with MT: lines of junction between cells of the CT. BT box: part of the lines in BT.

Modular Cell Components

The elements that make up a modular cell are:

  • Base Width: Supports all elements comprising the cell.
  • Cuba: Contains the switch and fuse muddy part of SF6.
  • Switch: Is 3-connected positions, planning and grounded.
  • Circuit Breaker: 3 pole, contains SF6 to a pressure of 3 bar. Each pole has 2 contacts (lower and upper).
  • Mando (Control): Can be manual and motorized.
  • Fuses: Mounted on trucks and introduced in the insulating resin fuse tube.

Transformer (TRAFO)

External Constitution:

  • Bushings MT: Responsible for the windings of the transformer interconnections with the input network in MT.
  • Pasatapas BT: Interconnect the windings of the transformer with the output network in BT.
  • Cuba (Tank): Tank containing liquid refrigerant and where the core and the windings go.
  • Expansion Tank: Located in the upper Cuba, assuring the full flood of Cuba.
  • Oil Level Indicator: Window to observe the level of transformer oil.
  • Desiccator: Its mission is to dry the air entering the transformer due to the decrease in oil level.
  • Thermostats: Indicate oil temperature, with adjustable contacts.
  • Lacquer Features: Summarizes the most important characteristics of the transformer.
  • Description Terminals: Performed at the top of the Cuba of the transformer.

Internal Constitution:

  • Magnetic Core: Path for which establishes the magnetic flux formed by ferromagnetic alloy steel plates.
  • Windings: Coils of wire made of copper or aluminum rectangular or circular section.

General Characteristics:

  • Tension Primary (Primary Voltage): The supply voltage of the transformer.
  • Tension Maxima of Service (Maximum Service Voltage): The higher voltage level for which the transformer is manufactured and running in steady state.
  • Rated Voltage Secondary: Voltage terminal obtained when feeding secondary to the primary circuit with rated voltage.
  • Rated Power: Maximum apparent power that can supply the secondary of a transformer referred to the nominal voltage preset temperature conditions.