LV Power Distribution Panelboards

The LV power distribution panelboards are installed downstream from transformers in MT/BT public distribution substations. They ensure, at the head of the low-voltage network, the general disconnection or closing under load, and distribution across 4 to 8 branches protected by removable fuse circuit breakers.
TUR LV Power distribution panelboards consists of:

• 1 general load disconnecting device (visible break four-pole switch-disconnector)
• Material of LV power distribution panelboards intended for interior use: Metal frame made of pre-galvanized sheet metal
• Four-pole (N, Ph1, Ph2, Ph3)
• Assigned current depending on transformer power (800, 1200, or 1800 A)
• Visible electric arc quenching in the air
• Open switch: Automatic grounding of the transformer's neutral
• Closed switch: Limitation of neutral overvoltages by a surge arrester (~10 kV)
• Connection via lugs, cables in aluminum or copper
• Panels can accommodate 4, 5, or 8 interchangeable Monobloc feeders

+ Rated voltage 440 V

+ Rated current of LV Switch and bus-bar 800 A

+ Rated current of LV Outgoing Feeders 400 A

+ Rated current of LV Public lightning protection device (ACG) 60 A

+ Rated frequency 50 Hz Dielectric withstand

+ Rated power-frequency withstand voltage (1min)

- Between poles and frame (to ground) 10kV

- Between phases 4kV

- Across isolating distance 4kV

+ Rated lightning impulse withstand voltage (1.2/50 µs)

- Between poles and frame (to ground) 20kV

Rated mainly active load-breaking current

+ Under 440 V at cosφ=0.9 800 A

Rated short-circuit making current: Irms / Ipeak

+ Under 440 V with fuses (at cosφ=0.35) 16 kA / 32 kÂ

Rated short-time withstand current (duration 0.5s): Irms / Ipeak

+ LV Switch and bus-bar (at cosφ=0.35) 16kA / 32kÂ

+ LV Outgoing Feeders (at cosφ=0.2) 32kA / 72kÂ

+ LV Public lightning protection device (ACG) (at cosφ=0.35) 16kA / 32kÂ