Eco-gas RMU + DTU in one outdoor enclosure for urban cable rings: metering-grade line-loss acquisition, small-current earth-fault location, 128-pt/cycle fault recording and local fault isolation.
Combining new-generation eco-gas insulation with primary–secondary integration, the cabinet comprises an eco-gas RMU, distribution terminal unit (DTU), outer enclosure and connecting cables. It controls and links incoming/outgoing feeders of urban underground cable rings and cable–overhead hybrid networks, delivering both ring and radial supply.
Metering-grade line-loss acquisition: real-time bay energy metering incl. bidirectional active and four-quadrant reactive energy
Small-current earth-fault judgment & location: multi-algorithm analysis of phase and zero-sequence CT data pinpoints the fault zone
Fault recording: 128 samples per cycle, 4 cycles pre- and 8 cycles post-fault with remote-signal status, cyclic storage of 64 records uploaded for analysis
Compact maintenance-free design saving precious land
Self-healing air-insulation structure — no SF6 pressure-leak risk; quality equipment for a robust distribution grid
High-reliability split breaker / three-position mechanism front-mounted outside the sealed tank: 40-year design life, 10,000 mechanical operations
Phase-segregated insulation — no inter-phase short-circuit explosion risk
Special direct-acting earthing switch allows multiple short-circuit closings
DTU adds earth-fault discrimination and line-loss metering on top of three-remote SCADA
Local fault isolation reduces outage scope and restores supply fast
Ambient −25 °C … +40 °C, max ΔT 25 K; altitude ≤ 1000 m
Daily RH ≤ 95 %, monthly ≤ 90 %; seismic 0.2 g horizontal / 0.1 g vertical
For 12 kV systems earthed via low resistance or arc-suppression coil
Site free of vapour, chemical deposits, dust or corrosive/explosive media harming insulation
Tell us about your load profile and site conditions — our engineers will help you size the right HiStore configuration.
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