faraday cage of HV transformer PD test

faraday cage of HV transformer PD test

Application:

HV test shielding room  (faraday cage) are Widely used in power cable, transformer, transformer switch, transformer substation and other High voltage levels of partial discharge test or impulse test.

 

Technical parameters:  

Ø Faladay cage Size:17.5m×7.5m× 6m(height)

Ø Control room :3m×2m×3m

Ø Motor driven airtight swing door :2.5×2.5(H)m ,upper transmission

Ø Shielding and grounding of Faraday Cage: it is a 6 surface shielding body,overall electrical connection among these 6 surface,multipoint grounding of main body.

Ø Efficiency after electromagnetic shielding  (to meet requests for PD testing )

  1. ≥60dB;

Ø Background noise:< 5PC

Ø Grounding resistance of grounding electrode:< 0. 5Ω (by B&D ready )

Ø There are 6 air-vents on top of roof.

Ø There is a switch box in cage but at one meter above ground.

Ø There are 9 lighting on roof,its illumination will be morn than  250lks at one meter above ground.

Ø Power supply into Faraday cage will be equipped filter.

Ø About ground connection wire :indoor ground copper bar

Ø Surface of Main body will be galvanized sheet and electrostatic

Ø spraying on surface.its craft and material meets China national standard.

Ø To meet the requirements of design and maintain,steel sheet split mounting type structure will be adopted.

Structure introduction

  1.  Main body
  • Main body will be installed on the ground of workshop. There is a small gradient at doorsill with convenient test object come in and out.
  • Shielding shell are stamping 1.5mm reliable galvanized steel sheets.well-regulated installing holes are arranged on contact surface.
  • Conductive article linings with spring and Galvanic corrosion resistance will be put between touching surface of steel sheets.
  • Fastener are M8 galvanize screws.
  • 40 mm spun glass sound-absorbing cotton will be put between shielding sheet and indoor adornment layer to reduce noise resound.
  • External surface of main body are structural steel keel,the roof are reinforced truss bridge to enhance rigidity and antiknock.
  1.  Masking Door
  • It is a motor driven airtight swing door with upper transmission
  • Its controlling is PLC controlling, voltage is 24V.energy conservation ,safe and reliable grounding.
  • Infrared ray brake device will be set on both sides.
  • Electrical lock will be installed on masking door. while testing will be making,if someone going, the system will stop running.
  1.  Ventilating

     There are 6 Ventilation waveguide window on top of roof. Size are 300×300×50mm.

  1.  Filter and power supply
  • Power supply should be filtering . a LV high frequency filter will used to wipe out electromagnetic noise.
  • Plug seat will be on surface of wall. All cables will go through by galvanized steel pipe.
  • Control room will locate in Faraday cage, size is 3×2×3(H)m.structural steel frame construction.
  • There is  a rectangle observation window on the wall of control room. Terrain clearance is 800mm.
  • Window material is 5㎜+5㎜ toughened glass.shielding copper net will be between two layers of glass.
  • Copper net will be welded on window frame.
  • Window frame and copper net with a reliable ground connection.
  • There are 2 sets of stainless steel grille lamp in control room.
  • Sever Plug seats will be set on the wall of control room.
  • One set of air condition n control room.(completed by B&D ).   
  • The wall of control room will be Double faced aluminum plastic board,the floor are all-steel anti-static raised floor.

4 . Grounding

  • Ground resistance of grounded screen should less than 0. 5Ω , it will be ready by B&D.
  • 2 ground connection copper plates should be put as grounding electrode of testing device.

Top lighting lamp locate on the roof.nine of  250W metal halogen lamp. (3 group).

  • Roof: Micropore-aluminium alloy sheet.combustibility is class A.lining are sound absorption inflaming retarding paper.feature: no dust,no dust absorption and easy dismounting.
  • Wall:wall surface are 0.6mm aluminium zinc plate (Punching Abatvoix) ,Plastic-sprayed surface.
  • Floor: placing concrete,epoxy terrace. Thickness should more than 3mm. (floor will be completed by B&D).

Due to increased environmental electromagnetic pollution, sensitive and accurate measurements are often affected by RF noise. The application of CNME Intermational Shielding Room provide the highest possible shielding attenuation, creating a controlled electromagnetic environment to perform high sensitive testing without distortion. If you are interested in our Faraday Cage, you can call us now.




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