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Hitachi

High-Voltage and High-Power Testing Laboratory

High-voltage bay

High-voltage bay

This bay, which is a one-storied structure as high as a 14-storey building, was constructed for high-voltage testing of medium-voltage to ultra-high-voltage.

[Dimensions]

External dimensions:
 W57m x L60m x H48m
Internal dimensions:
 W47m x L56m x H42m

[Features]

High-level shielding:
 50 dB at a frequency of 1 MHz
 copper-embedded floor
 and iron-streel-welded walls and roof
Low grounding resistance:
 0.35Ω

[Handling equipment]

Cranes:
 30 tons and 10 tons

Impulse voltage generator

Impulse voltage generator

For the performance of electrical-insulation withstand tests for lighting impulses and switching transient over-voltage, this device generator lighting and switching impulse voltages.

[Specifications]

Nominal rated voltage:
 6000kV
Nominal rated stored energy:
 600kJ
Capacitance:
 0.0325μF

[Features]

Impulse waveform rise-time/tail-time
Lightning impulse 1.2/50μs
3/40μs
Switching impulse 50/2500μs
100/2500μs
250/2500μs
500/5000μs
1000/5000μs

AC voltage generator

AC voltage generator

For the performance of electrical-insulation withstand tests for alternating current over-voltages, this device generators high voltages at power frequency.

[Specifications]

Nominal rated voltage:
 2200kV
Nominal rated current:
 5A

[Features]

Resonance-type high voltage generator

DC voltage generator

DC voltage generator

For the peformance of electrical-insulation capability tests for direct-current(DC) over-voltages in power cables and HVDC(*) equipments, this device generators DC high volteges.

[Specifications]

Nominal rated voltage:
 1800kV
Nominal rated current:
 20mA

[Features]

Polarity reverseal time:
 200ms


 *HVDC:High-voltage direct current