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Shield system design and installation schemeShielding room shielding system overall design scheme
KDZD High voltage partial discharge shielded chamber/Ultra-high pressure UHV partial discharge (shock) laboratory
Shield housing
The shielding shell is the basis to ensure the shielding performance of the shielding room, is the carrier of decorative materials and most of the auxiliary systems, and is the most basic component of the shielding room, which requires the wall of the shielding room to have sufficient strength and stability. After calculation, the overall theoretical weight of the shielding chamber is about 3t, and the ground pressure is about 150kg/m² (this weight does not include personnel, equipment, samples, transport vehicles and others). The service life of the shield is 20-30 years, and the seismic resistance level of the shield shell is calculated according to level 8.
Considering the bearing weight of the bottom layer, the design life, cost and production process of the shielding chamber and the structural strength of the steel plate, the shielding chamber roof and wall shielding module are made of 2mm galvanized steel plate by cutting, punching, bending, stress treatment and other processes. During assembly, galvanized bolts, nuts and gaskets are used for fixing, and the middle is assembled with a pressure conductive liner. The side wall shielding module adopts a self-supporting structure. In order to reduce the sinking of the middle part of the top of the shield, several channel steel beams are set above the top to effectively reduce the deformation of the top steel plate.
The underside of the shielding chamber is made of 3mm galvanized steel plate, which is cut and formed into a unit splicing into a standard module. The steel plate is pressed and riveted on the keel frame, and the ground keel is welded with square pipe or other steel. After finishing, the surface should be treated with rust prevention.
KDZD High voltage partial discharge shielded chamber/Ultra-high pressure UHV partial discharge (shock) laboratory
Shield chamber bottom design
Since the underside of the shielding chamber bears a certain load for a long time (such as the handling of equipment, product access, etc.), in order to reduce the undue vibration and deformation of the floor shielding body, the underside of the shielding chamber is made of 3mm galvanized steel plate + square tube keel. The ground is designed with a force of 600kg/m².
The insulated floor is an isolation layer composed of 5mmPP insulation board welding. The insulated floor size is as follows: 7.5m long x 5.5m wide, the insulation resistance between the test area and the outside world is required to be above 10kΩ, to ensure that the entire test system has no electrical connection with the workshop. Prevent the interference signal of other electrical equipment in the production workshop from being transmitted to the surface or underground metal parts (such as steel bars, etc.) in the test area through electrostatic coupling, and finally pass into the test loop through the ground wire.
Shield room wall design
The shielding wall is a hexahedral structure composed by continuous splicing of shielding modules. The wall shielding module is made of galvanized steel plate and rectangular tubular steel, and the shielding module can support itself.
Shield chamber top structure design
The top structure of the shielding chamber is made of 2mm galvanized steel plate into a shielding module, and the top plate of the shielding chamber is installed above the inside of the side panel. In order to disperse the weight of the shield and reduce the sinking of the middle part of the top of the shield, several reinforcing beams are set above the top to effectively reduce the deformation of the top steel plate.
KDZD High voltage partial discharge shielded chamber/Ultra-high pressure UHV partial discharge (shock) laboratory
Screen room door design
Manual double-opening rotating screen door 2200mm (W) x 2800mm (H)
1, the structure adopts hinge rotation, the left and right door are revolving, the door is equipped with internal and external handles, the door push-pull opening force is 150N. The single layer electromagnetic seal reed is made of beryllium bronze material, which achieves good elasticity and wear resistance after vacuum heat treatment. The shielding reed is detachable, each section is 198mm long, and it is easy to replace if there is partial damage, without professional maintenance. The door opens and the power is off.
2, the door closed 10000 times without mechanical failure, shielding performance index does not decline.
3. When the screen door is closed, close one door first and fix it with a latch, and then close the other one. The seams between the left and right doors should also be screened with beryllium bronze reed.
4, screen door threshold height of about 30mm. Iron slope (2.5 m wide, high as threshold). The door is equipped with an on/off switch for incoming and outgoing power control. After the door is closed, it can be closed to do the test, if in the test, once opened, the internal automatic power off.
Net size of the screen door: width 900mmx height 1900mm (one, personnel access) screen room door is the most important part affecting the shielding effect of the entire shielding room, is to keep the total performance of the shielding system from degradation of the weakest component, but also the only movable part of the system, so it is particularly important to maintain the stability of the shielding door shielding efficiency.
(1) The structure adopts hinge rotation, knife type manual shield door, double-point locking mechanism, double-layer electromagnetic sealing reed, reed made of beryllium bronze material processing and forming after vacuum heat treatment to achieve good elasticity and wear resistance. The shielding reed is removable and the length of each section is less than 198mm. If there is damage, it is easy to replace without professional maintenance.
(2) The knife edge of the insert knife screen door is made of brass plate.(3) Because the reed and its contact part (the knife edge of the screen door) are of the same material, the potential difference is consistent, so there will be no electrical corrosion at the contact point of each other, to ensure long-term shielding effectiveness.
(4) The locking device is installed in the upper part of the door frame, and the double-point diagonal wedge locking mechanism is installed on the left side of the door frame. The operation of the diagonal wedge mount adopts a roller chute structure.
(5) The locking operation device is installed in the middle of the door plate, the gear mechanism greatly reduces the force of opening the shield door, and the double-point oblique wedge locking mechanism is installed on the left side of the door frame. The operation of the oblique wedge mount adopts the bearing chute structure, which is smooth and lightweight.
(6), locking screen door design linkage open, indoor and outdoor can be operated.
Manual door materials: common brass and beryllium bronze.
Grounding system (Demander is responsible, supplier provides technical support)
The ground wire should be independently grounded and cannot be connected to the grounding system of the workshop, that is, isolated by the insulated floor and single-point grounding with a separate grounding pole. The grounding resistance is required to be no more than 1Ω. The ground wire should be made by the demander and supported by the supplier.
Cut-off waveguide window and ventilation system
In this scheme, two waveguide Windows with hexagonal waveguide 300×300, hole spacing 4.2mm and cut-off frequency of 20GHz are selected.
A forced ventilation fan is installed on the cut-off waveguide window to realize the air exchange between the shielded room and the shielded room. The whole shielding room adopts the mode of 1 air inlet and 1 air outlet. Installed in the control room.
Slope design
In order to enter and exit the test forklift, 1 iron ramp (about 2.1 meters wide, and the height of the ground in the shielded chamber) is equipped.
Shielded indoor power supply, distribution and lighting system
Electrical design and construction principles:
According to the use requirements of the shielding room and the relevant national design standards, the nature and task of the shielding room system are fully considered, and the quality, safety and technical advancement of the power supply and distribution, and the comfort of the working environment of the personnel are the design principles.
According to the size of the power load of each equipment, the power cable with appropriate diameter and the power filter with different capacity are selected; A power filter with low leakage current is selected, and the insertion attenuation is consistent with the comprehensive efficiency of the whole shielding chamber. The indoor power supply is routed through pipes and power sockets are configured according to the required positions.
Three-phase Yyn0 connection, can output 380V voltage, to meet the needs of different equipment.
The power supply entering the shielding chamber through the filter needs to pass through the wall of the shielding chamber, and the shielding tube structure through the wall is made according to the requirements.
According to the size of the power load of each equipment, the power cable with appropriate diameter and the power filter with different capacity are selected; The power filter with low leakage current is selected, and the insertion attenuation is consistent with the comprehensive efficiency of the whole shielding chamber. The indoor power supply is routed through pipes and power sockets are configured according to the required positions.
When the power supply enters the shielding chamber through the filter, it needs to pass through the wall of the shielding chamber. The structure of the shielding tube through the wall is made according to the requirements in Figure 3.
The power supply is transmitted to the shielded indoor lighting and various electrical equipment through the power filter and distribution cabinet.
Install the power distribution box (PZ30-8 ~10P) in the appropriate position of the shielding room according to the requirements, one power circuit breaker for the built-in device (380V/80A), and two power circuit breakers for the lighting instrument socket (220V/32A).
2 lighting switches (two combined type, the test area lights are divided into 2 groups of separate control), 6 power 2+3 sockets (10A), installed in the designated position on the site.
4 lights without electromagnetic interference are installed at the top of the shielding room, and 2 lights without electromagnetic interference are installed at the top of the control room. The light source is installed in the shielding lamp shade, and the lighting effect is excellent. The supplier reasonably determines the clearance of the luminaire according to the installation height. Ensure the uniformity of light in the shielded room.
Interior decoration
Decoration design basis
GB/T2887-2011 "General Specification for Computer Venues"
> GB50174-2008 "Electronic Information Room Design Code"
GB/T9361-2011 "Computing Station site Safety Requirements"
> GB50222-2016 "Building Interior decoration design fire Code"
> The actual situation of the equipment room floor and the site
Decoration of the main material selection
According to the interior decoration requirements of the Design Code for Electronic Computer Room, the selected materials should be (combustion performance grade A) or refractory materials (combustibility)
Ability level B1)
1. The top is made of galvanized steel.
2, outdoor wall: wall decoration
Interior wall: galvanized steel spray
3. Floor: galvanized steel plate.
Indoor electrical lighting system
1. The working area is illuminated by non-electromagnetic interference lighting fixtures.
2, lighting control selection switch box, switch control.
3, the shielding room is equipped with switch sockets, reasonable arrangement of lamp switches, sockets, quantity and position to ensure that the illumination meets the requirements.
4. If wall-mounted air conditioning is installed in the test area, it shall be provided by the demander and installed during the construction period of the supplier. The air conditioner shall be a non-variable frequency air conditioner and shall be placed in a position that will not affect the equipment, as specified by the customer.
| Overall dimension of shielding chamber | length 7 m x width 5 m x height 3 m |
| Shielding interior dimensions | length 6.8 m x width 4.8 m x height 2.9 m |
| Manual double-opening rotary screen door | width 2.2m x height 2.8m |
| Screen door | width 0.9 m x height 1.9 m |
| Insulated floor size | length 7.5m × width 5.5m |
| Magnetic field | ≥60dB at 10-100KHZ |
| Electric field | ≥60dB at 100K-1GHZ |
| Equipment power supply filter | 380V/80A 1 way |
| Instrument/lighting power supply filter | 220V/32A 1 way |
| Mechanical properties of the shielding shell | plate irregularity ≤4mm/M², shielding perpendicularity ≤5mm |
| Deformation degree in two years | top sag ≤8mm bottom sag ≤3mm |
| Shielding performance (measured at 1 m inside the gate) | |
| The background noise of partial discharge in the test loop (without sample) is less than 1pC | |
| The shielding chamber can meet the test of external voltage resistance and partial discharge used in the laboratory of new products | |
| In order to meet the electricity needs of the test products configured in the shielding room |
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