Urban, suburban and rural medium voltage overhead distribution feeders, sectionalizing protection for long distribution lines, solar farm outgoing overhead circuits, distribution network renovation and expansion projects. It isolates transient and permane
ROCKWILL Air insulated Ring Main Unit (RMU) is factory-assembled, metal-enclosed modular switchgear for medium voltage distribution systems. It uses atmospheric air as the insulating medium, equipped with load break switches and optional fuse combination units for transformer protection. The modular design allows flexible combination of ring-in, ring-out and transformer protection bays. The product complies with IEC 62271-1:2017, IEC 62271-103:2019 and IEC 62271-200:2021. Relevant documents include Type Test Certificate No. TT-2025-04131, Witness Test Report No. WT-2025-09066, Routine Factory Test Report No. FT-2025 series, Raw Material Mill Certificates, all issued by CNAS accredited independent high voltage test laboratory and available for tender submission, utility review and project site acceptance. Manual or motorized operating mechanisms can be selected, and optional fault indicators and communication modules support distribution automation. Tropicalised anti-corrosion treatment is available for high humidity, heavy rain and coastal salt mist environments.
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24kV SF6 free RMU ,12kV SF6 free RMU ,36kV SF6 free RMU ,40.5kV SF6 free RMU
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Ring Main Unit ini mengadopsi udara atmosfer sebagai media isolasi antara bagian bertegangan dan bumi, tidak memerlukan gas SF₆, yang menyederhanakan manajemen gas dan mengurangi risiko terkait gas rumah kaca.
RMU tipe SM66 dirancang untuk sistem daya nominal 36kV dengan tegangan maksimum pengenal 40.5kV.
RMU ini menggunakan udara atmosfer sebagai media isolasi, bebas dari gas SF₆, sehingga menghindari kebocoran gas dan kekhawatiran terkait gas rumah kaca.
Mendukung kombinasi modular yang fleksibel termasuk bay masuk cincin, bay keluar cincin, dan bay proteksi transformator. Dapat dilengkapi dengan sakelar pemutus beban saja atau unit kombinasi sakelar pemutus beban dan sekering.
Mekanisme pengoperasian manual adalah standar, sedangkan aktuator bermotor merupakan opsi untuk kendali jarak jauh dan otomatisasi distribusi.
Indikator lintasan gangguan, sensor suhu, dan modul komunikasi bersifat opsional untuk penentuan lokasi gangguan, pemantauan status, dan integrasi SCADA.
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