Research Development

Test Facilities

NGK High Voltage Laboratory provides world's leading high voltage test facilities suitable for estimating insulator string assembly and other power system equipment. The Laboratory also provides other types of facilities.

AC/DC High Voltage Test Facilities

Power-frequency withstand voltage test on 1000kV gas bushing
Power-frequency withstand voltage test on 1000kV gas bushing
UHV AC Test Hall
  • Dimensions of hall: 40m x 40m x 30m h
  • Double-shielding system by expanded iron netting (Electromagnetic shielding effect: 75dB at 1MHz)
  • Auxiliary equipment: AC high voltage transformers, Spray nozzle set, 3mf x 5mh oil tank
AC 1500kV High Voltage Source
  • Transformers: 750kV, 1375kVA, 2 units in cascade connection
  • Corona free up to 1000kV
DC 500kV High Voltage Source
  • Type: Delon-Greinacher circuit by using silicone rectifiers
  • Rated voltage: 500kV
  • Rated current: 30mA
Corona Noise Instrument
  • Coupling capacitors: 2000pF(500kV), 1000pF(1500kV)
  • Radio noise meters: NEMA type meter, CISPR type meter
  • Partial discharge measuring instruments: MPD600 type

Impulse Test Facilities

3600kV Lightning Impulse Generator and 2300kV Switching Impulse Voltage Test Facilities
  • Max. voltage available: 3000kV
  • Max. voltage available: 2300kV

Contamination Test Facilities

Contamination test of 500kV DC suspension insulator device
Contamination test of 500kV DC suspension insulator device
UHV Contamination Test Hall
  • Dimensions of fog room: 30m x 25m x 30m h
  • Electromagnetic shielding effect: 65dB at 1MHz
  • Fog generating equipment: 6ton/hr. boiler and spray nozzle in total 150 in 4 different directions
AC 1000kV Contamination Test Facilities
  • Testing transformer: 1000kV, 5000kVA/ 1 min, 4000kVA/ continuous
  • Voltage drop of the total system: Less than 5% at 3A, 600 - 1000kV
  • Power Source: Short circuit generator (3-phase, 125MVA)
DC 750kV Contamination Test Facilities
  • Type: Cascaded three phase full-wave rectification with feed-back system
  • Rated current: 1A (30mA at 800kV)
  • Voltage drop of the total system: Less than 5% at 2.5A, 200 - 750kV
  • Power Source: Short circuit generator (3-phase, 125MVA)
AC 100kV Contamination Test Facilities
  • Dimensions of fog room: 6.4m×5.3m×4.8m h
  • Testing transformer: 100kV/50kV, 300kA

Power Arc Test Facility

  • Short Circuit Generator (3-phase, 125MVA)
  • AC 12kA Power Arc Test

Mechanical Test Facilities

Bending test of 500kV polymer insulator
Bending test of 500kV polymer insulator
  • 1000kN-m Bending Test Facility
  • Steel Towers