Shielded Faraday cage

Overview
The high-voltage partial discharge shielding room is engineered for testing electrical power equipment up to 35 kV. The facility provides a controlled electromagnetic environment and complies with relevant national standards for AC/DC withstand, partial discharge and cable accessory tests.

Product parameters

• 1. Project location: to be provided by the purchaser
• 2. Equipment name: 35 kV high-voltage shielding test hall
• 3. Building dimensions: approximately 9 m (L) × 5 m (W) × 4 m (H)
• 4. Design considerations: integrated solution covering building decor, electrical engineering, environmental protection, safety measures, HVAC purification, IT and weak-current control, fire protection and electromagnetic shielding
• 5. Delivery: turnkey project including design, supply, installation and commissioning

Turnkey sub-projects (components)

• Grounding system — 1 set
• Shielding shell — 1 set
• Electric sliding airtight shielding door — 1 set
• Controller — 1 set
• Manual shielding door — 1 unit
• Power distribution for shielding room and control room — 1 set
• Ventilation system — 1 set
• Third-party inspection report — 1 copy
• Other items — detailed in proposal

Supplier responsibilities

• Secondary design of the shielding system based on purchaser drawings
• Supply, site installation and commissioning of the shielding room and components
• Provide product and auxiliary installation drawings and operating procedures
• Deliver technical services including maintenance support and operator training
• Cooperate technically with purchaser for civil works and equipment cabling
• Provide third-party verification reports: separate shielding effectiveness test and joint acceptance test report after test equipment installation

Performance indicators / Project purpose

• Supports testing of AC and DC transmission and distribution equipment up to 35 kV (provision for equipment upgrade)
• Suitable for AC/DC withstand voltage tests, partial discharge (PD) tests and cable accessory tests

Technical requirements — Operating conditions

• Ambient temperature: -10 °C to +40 °C
• Relative humidity: 20%–95%
• Altitude: below 500 m
• Installation: indoor
• Power supply: three-phase five-wire 380 VAC (±10%), 50 Hz (±1 Hz)

Technical specifications

• Shielding hall dimensions: approx. 9 × 5 × 4 m (L × W × H)
• Control room dimensions: 3.5 × 2.5 × 2.8 m (L × W × H)
• Magnetic-field shielding effectiveness: 14 kHz–1 MHz ≥ 60 dB
• Electric-field shielding effectiveness: 100 kHz–1 GHz ≥ 70 dB
• Reverberation time: <55 (at 100 Hz)
• Seismic resistance: intensity 7
• Grounding resistance: ≤ 1.0 Ω
• Floor insulation resistance: ≥ 1000 MΩ
• Shielding room vs. main building insulation resistance: ≥ 10 kΩ
• Background noise for PD detection: ≤ 2.0 pC

Additional images
Illustrative images and layout diagrams are provided showing the shielding room, doors, control room and internal arrangement.

Characteristics / Technical specifications

• Product name: High-voltage partial discharge shielding room (35 kV test hall)
• Test voltage range: up to 35 kV (upgrade provision)
• Hall dimensions: ≈ 9 × 5 × 4 m
• Control room: 3.5 × 2.5 × 2.8 m
• Doors: electric sliding airtight shielding door and manual shielding door
• Scope of supply: turnkey design, supply, installation, commissioning, drawings, operating procedures, maintenance support, operator training and third-party verification