ตัวจับการกระจายสินค้า
Distribution Arresters are essential protective devices that safeguard electrical distribution systems against transient overvoltages and lightning strikes. These devices utilize metal oxide varistors (MOV) technology, featuring zinc oxide blocks as their primary component, which instantly become conductive during surge events to divert excess current to ground. Distribution Arresters work by clamping surge voltages to manageable levels, protecting vital equipment like transformers, switchgear, and distribution lines operating at voltages up to 72.5 กิโลโวลต์.
Distribution Arresters come in three main classifications: Normal Duty (ND), Heavy Duty (HD), and Heavy Duty Riser. The Normal Duty type serves as baseline protection for areas with minimal lightning activity, while Heavy Duty variants offer enhanced protection for severe lightning-prone regions. The Heavy Duty Riser type, featuring larger diameter MOV discs, provides the highest level of protection and is typically installed to safeguard underground distribution cables and equipment. Modern Distribution Arresters utilize either porcelain or polymer housings, with silicone rubber being the predominant housing material due to its superior UV resistance and hydrophobic properties.
Features of Distribution Arresters:
• Advanced MOV technology for rapid surge response
• Multiple protection levels for various application needs
• Integrated disconnector functionality for visible failure indication
• Weather-resistant polymer housing options
• High mechanical strength and durability
• Comprehensive IEEE C62.11 compliance
Distribution Arrester Drawing
| พิมพ์ | Rated voltage (กิโลโวลต์) | MCOV (กิโลโวลต์) | Steep current impulse(กิโลโวลต์) | 8/20us Lightning impulse(กิโลโวลต์) | Repetitive charge transfer rating, Qrs (ค) | 4/1 Ous High current impulse(kA) | 2ms rectangular current impulse withstand(ก) | Arrester classification | |
| DA5W-3 | 3kV5kA | 3 | 2.4เควี | 11 | 8.3 | 0.4 | 100 | 400 | DM |
| DA5W-6 | 6kV5kA | 6 | 4.8เควี | 20 | 16.6 | 0.4 | 100 | 400 | DM |
| DA5W-9 | 9kV5kA | 9 | 7.2เควี | 29.5 | 24.9 | 0.4 | 100 | 400 | DM |
| DA5W-12 | 12kV 5kA | 12 | 9.6เควี | 39 | 33.2 | 0.4 | 100 | 400 | DM |
| DA5W-15 | 15kV 5kA | 15 | 12เควี | 48.5 | 41.5 | 0.4 | 100 | 400 | DM |
| DA5W-18 | 18kV 5kA | 18 | 14.4เควี | 58 | 49.8 | 0.4 | 100 | 400 | DM |
| DA5W-21 | 21kV 5kA | 21 | 16.8เควี | 67.5 | 58.1 | 0.4 | 100 | 400 | DM |
| DA5W-24 | 24kV 5kA | 24 | 19.2เควี | 77 | 66.4 | 0.4 | 100 | 400 | DM |
| DA5W-27 | 27kV 5kA | 27 | 21.6เควี | 86.5 | 74.7 | 0.4 | 100 | 400 | DM |
| DA5W-30 | 30kV 5kA | 30 | 24เควี | 96 | 83 | 0.4 | 100 | 400 | DM |
| DA5W-33 | 33kV 5kA | 33 | 26.4เควี | 105.5 | 91.3 | 0.4 | 100 | 400 | DM |
| DA5W-36 | 36kV 5kA | 36 | 28.8เควี | 115 | 99.6 | 0.4 | 100 | 400 | DM |
| DA10W-3 | 3kV lOkA | 3 | 2.4เควี | 11 | 8.3 | 0.4 | 100 | 400 | DH |
| DA10W-6 | 6kV lOkA | 6 | 4.8เควี | 20 | 16.6 | 0.4 | 100 | 400 | DH |
| DA10W-9 | 9kV lOkA | 9 | 7.2เควี | 29.5 | 24.9 | 0.4 | 100 | 400 | DH |
| DA10W-12 | 12kV lOkA | 12 | 9.6เควี | 39 | 33.2 | 0.4 | 100 | 400 | DH |
| DA10W-15 | 15kV lOkA | 15 | 12เควี | 48.5 | 41.5 | 0.4 | 100 | 400 | DH |
| DA10W-18 | 18kV lOkA | 18 | 14.4เควี | 58 | 49.8 | 0.4 | 100 | 400 | DH |
| DA10W-21 | 21kV lOkA | 21 | 16.8เควี | 67.5 | 58.1 | 0.4 | 100 | 400 | DH |
| DA10W-24 | 24kV lOkA | 24 | 19.2เควี | 77 | 66.4 | 0.4 | 100 | 400 | DH |
| DA10W-27 | 27kV lOkA | 27 | 21.6เควี | 86.5 | 74.7 | 0.4 | 100 | 400 | DH |
| DA10W-30 | 3OkV lOkA | 30 | 24เควี | 96 | 83 | 0.4 | 100 | 400 | DH |
| DA10W-33 | 33kV lOkA | 33 | 26.4เควี | 105.5 | 91.3 | 0.4 | 100 | 400 | DH |
| DA10W-36 | 36kV lOkA | 36 | 28.8เควี | 115 | 99.6 | 0.4 | 100 | 400 | DH |
คำถามที่พบบ่อย (คำถามที่พบบ่อย)
How do distribution arresters enhance grid reliability?
Distribution arresters improve grid reliability by diverting excess energy to ground, preventing outages, minimizing disruptions to customers, and maintaining stable voltage profiles. They can also be integrated into smart grid systems for real-time monitoring of system performance and health.
What is the purpose of a distribution surge arrester?
A distribution surge arrester protects electrical infrastructure against sudden voltage increases or “surges” caused by lightning strikes or other transient events. It limits the voltage of the power distribution system and diverts excess current to ground, preventing damage to sensitive equipment.
How do ZnO MOV blocks work in distribution arresters?
Zinc oxide MOV (Metal Oxide Varistor) blocks in distribution arresters provide a low-resistance path for current. They conduct high levels of electricity, absorbing voltage and dissipating excess energy while limiting damage to the distribution system.
What factors should be considered when rating a distribution surge arrester?
When rating distribution surge arresters, consider the surge rating (expressed as a voltage rating), which indicates its operating conditions and energy diversion capacity. อีกด้วย, take into account the size, construction materials, and dimensions of the arrester, as these affect overall performance.
Where should distribution surge arresters be used?
Distribution surge arresters should be used in distribution networks to protect lines, transformers, and other electrical equipment from lightning strikes or power faults. This helps reduce downtime, repair costs, and revenue loss due to outages.
What are the benefits of polymeric housings in distribution arresters?
Polymeric housings, particularly those made of silicone rubber, offer superior pollution performance, improved safety, and better sealing against moisture ingress compared to traditional porcelain housings. They also perform better under high contamination conditions due to long-term hydrophobic properties.
What is the role of a disconnector in distribution arresters?
Most distribution arresters are equipped with a disconnector device that separates the ground lead if the arrester fails. This ensures that arrester failure does not cause a permanent outage and provides a visible indication for maintenance staff to replace the arrester.