The partial discharge shielding room is a special laboratory or closed space, which is mainly used for partial discharge testing of high voltage equipment. Partial discharge is a small-scale corona discharge phenomenon that occurs in the electrical insulation system, which may cause damage to the insulation system and eventually lead to equipment failure. The main function of the partial discharge shielding room is to reduce electromagnetic radiation and electric field interference through its special metal shielding structure and insulating materials. So how does the partial discharge test shielding room ensure a closed environment for high voltage partial discharge testing?
The following are the general working environment requirements of the partial discharge test shielding room of Shanghai DEMIKS Electric Power Technology Co., Ltd.:
- Metal shielding: The partial discharge test shielding room should be made of metal materials such as copper or aluminum, and must have good shielding capabilities to reduce the impact of electromagnetic interference on the outside world.
- Grounding system: It is very important to establish a good grounding system to ensure that the current can effectively flow back to the site through the ground, prevent accidental electric shock and maintain the stability of the test environment.
- Shielding sealing: The doors and other openings of the shielding room built by Demix have good sealing performance to prevent electromagnetic fields from leaking into the external environment while maintaining the stability of the test environment.
- Safety equipment: Appropriate safety equipment should be equipped in the shielding room, such as emergency stop button, leakage protection device, etc., to ensure the safety of operators.
- Temperature control: In order to maintain the stability of the test environment, the Demix partial discharge test shielding room usually needs to be installed with a temperature control system, which can cool or heat the test room as needed.
Common partial discharge shielding test rooms are of two types: assembled and welded. The assembled type is assembled by screws using steel plate modules, while the welded type is welded by welding steel plates to keels. When users determine the construction of a partial discharge shielding test room, which form is better? Based on the engineering project experience and experience of Shanghai Demix Power Test Engineers over the years, Demix Power Test Engineers made a brief comparison of plate, module manufacturing, production process, construction cycle, manufacturing cost and test room size, hoping to provide some reference for everyone.
Comparison of advantages and disadvantages between assembled partial discharge shielding room and welded partial discharge shielding room
| ITEM | Assembled Partial Discharge Shielding Room | Welded Partial Discharge Shielding Room | Photos |
| 1. Panels for partial discharge shielding rooms | Mainly made of galvanized steel plates, the material cost is relatively high. | Mainly made of cold-rolled steel plates, the material cost is relatively low. |  |
| 2.Partial discharge shielding room module manufacturing process | The manufacturing process mainly includes cutting, punching, folding, spraying, etc. There are relatively many steps, large cumulative errors, great difficulty in quality control, and high requirements for material transportation and packaging. | The manufacturing process mainly includes cutting, folding, etc. There are relatively few steps and the quality control difficulty is relatively small. |  |
| 3.Partial discharge shielding room installation process | Each module is assembled together, including between walls and floors, by screws and conductive lining. Its characteristics are low skill requirements for on-site construction workers, the finished house is more beautiful, and the decoration workload is small. In addition, it can be dismantled, transferred, and reassembled for reuse. | The steel plates are directly welded together using carbon dioxide shielded welding, and then rust-proofed. This form of construction requires high skills of on-site construction workers, and once the building is completed, it is not easy to disassemble and re-use. However, this form of construction also has advantages, such as small geometric size error, welds are not easy to leak magnetic flux, and shielding effects are easier to ensure. |
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| 4.Construction period of partial discharge shielding room | It mainly includes plate assembly, leakage detection, leakage repair, etc. The assembly workload is large, and it requires multiple people to participate in the assembly and adjustment. After the initial installation is completed, it takes a long time to detect and repair leakage. | It mainly includes welding and decoration work. The welding workload is relatively large, and after the construction is completed, it will take more time for decoration work than the assembly type. However, the welding type construction can be formed in one time, and the time for leak detection and repairing is shorter. The construction period of the shielding room of the same size may be shorter after comprehensive consideration. |
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| 5.Partial discharge shielding room manufacturing cost | Material cost and labor cost Wall material and labor costs are relatively high. | The cost of wall materials is relatively low, but the cost of decoration needs to be increased. |  |
| 6.Test chamber size | Modular Partial Discharge Lab: Suitable for projects of all sizes. | Welding partial discharge laboratory: suitable for projects that do not require high indoor height. |
Shanghai Demiks Power Technology Co., Ltd. can provide a full range of services including the design, construction and testing of partial discharge shielding laboratories. For high voltage power detection tests, insulation withstand voltage tests, and non-partial discharge tests, please contact Shanghai Demiks Power Technology Co., Ltd. Contact Email: contact@demikspower.com
