What is bus post isolator

Grounding the extension equipment

We have to earth the points in an electrical substation.

  1. The neutral point of different voltage levels.
  2. Metal housing of all current-carrying devices.
  3. Frame for all common devices.
  4. The entire metal structure is not connected to live equipment.

We connect all the points that should be groundedEarthing grid with corrosion resistance mild rods. We bury the connecting rods at least 600 mm below the ground. If these horizontally buried poles run a cable trench, road, underground pipeline, or rail, the poles should traverse the barriers at least 300 mm below the bottom of the barriers. While we use MS rods to connect the earth grid below ground level, we usually use MS flats for the same above ground level. We call the connection between different earthing points and wiring grids a riser. We usually use MS flats in part of the risers above the ground. The pole portion of the risers below the floor is identical to the pole ladders used to create the main earth grid.
We should connect all steel structures to the earth network with at least two risers. In this case, one riser in the x-direction must come from the rod of the earthing grid and the other from the y-direction.

We also connect the grounding points of all devices in the same way.
We connect all isolator mechanics boxes with individual auxiliary earth mats and each auxiliary earth mat with the main earth network. We put each additional earth mat only 300 mm below the surface of the earth.
We connect all Raisers Flats with grounding pads, we should paint the screw connections with anti-corrosion paint. This ground point cannot be welded to facilitate equipment replacement if necessary.
The lines come from the earth mat as a riser and are welded to the earth grid. The aboveground surfaces should also be welded to the pole ladder underground. We have to paint the welding points with red lead and bitumen.

Grounding of the gantry tower

The shield wire comes down along one leg of the portal structure. The shield wire that comes down along a post of a gantry structure is called the down corner. The downcomer is clamped to the leg elements of the construction at intervals of 2 meters. This downcomer is connected to a grounding line that comes directly from a grounding electrode on the pipeline. Diagonally opposite legs of the same structure should be connected directly to the main earth network via risers.

Grounding the bus post isolator

Each bus post isolator or BPI is connected to the main ground grid via two risers. An area of ​​50 mm × 10 mm ms is deposited along the BPI support structure from each of the two grounding points of the BPI metal base. These MS flats from the base of the BPI are connected to the risers that come from the x and y conductors of the main ground grid.

Grounding the current transformer

A 50 mm x 10 mm area runs along the support structure of the current transformers from the metallic base of the current transformer. This is connected to the main earth network via a riser. Diagonally opposite vertical leg members of the structure are connected to the main earth grid by another riser. If the first riser comes from an x-conductor of the earth grid, the second riser must come from the rod conductor in the y-direction.

The CT junction box should also be connected to the main earth network at two points with 50 mm × 10 mm flats.

Grounding the circuit breaker

Support structure of each pole of a circuit The switch is connected to the main grounding grid together with the metallic base of the poles via two risers, preferably one from the x and the other from the y direction. The structure of the masts is flatly connected to each other with 50 mm × 8 mm ms. The mechanical box of each pole is also connected to the main earthing grid with a 50 mm × 10 mm flat surface.

Ground the isolator

The base of each pole of the insulator should be connected together by means of a 50 mm x 10 mm area. This MS-Flat is connected to the main earthing network via two risers, preferably one from x and another from y-directional mats. The isolator mechanism box should be connected to the additional grounding mat, and the additional grounding mat should then be connected to the main grounding grid at two different points on the main grounding grid.

Earthing of lightning barriers

The base of the lightning rods must be connected to the main earth network by a riser, and the structure of the lightning rods must be connected to the main earth network by another riser. An additional ground connection is provided in lightning rods, which connect a treated earth pit via an overvoltage counter of the arrester. This earth pit can be with test connection.

Grounding the capacitive voltage transformer

The basis of the CVT, or capacitive voltage, the transformer is connected to the main earth network via a riser. The special grounding point on the base of the CVT is connected to the grounding conductor of the pipeline with a flat 50 mm × 8 mm. The lower part of the support structure is also connected to the main earth grid via a riser. Two opposite earth points of the CVT junction box should also be connected to the main earth network.

Grounding the cable sealing system

The load-bearing structure of a cable seal The system should be connected to the main earth network via two risers. The 50 mm × 10 mm grounding strip must come flat down from the top of the support structure.

Grounding Bay Marshalling Kiosk

Two protected lines have two opposite sides of the bay shunting kiosk. These two points must be connected to the main earth network via two risers. These links are located in the lower area of ​​the shunting kiosk or the box.

Grounding the grounding transformer

The base of the earthing transformer must be connected to the main earthing network via two risers. The neutral point of the earthing transformer must be connected to the earthing conductor of the pipeline with the test connection. The neutral conductor earth connection should be routed through a neutral current transformer to protect against earth faults.