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Hitachi

High-Voltage and High-Power Testing Laboratory

Short circuit generator

Short circuit generator

This short-circuit generator is used as a high-power source simulating short-circuit fault in power systems.

[Specifications]

Rated capacity:
 250/300MVA (50/60Hz)
Rotation speed:
 1500/1800rpm
Nominal rated voltage:
 12.0/14.4kV
Nominal rated short circuit capacity:
 3.0/3.6GVA (at 60ms after value)

[Features and usage]

  1. Double rating for 50Hz-60Hz operation
  2. Extra-low impedance
  3. Super-excitation control

Short circuit transformer

Short circuit transformer

These transformers are used for adjusting the test voltage according to the test conditions

[Specifications]

Rated capacity:
 180/216MVA/set
Primary voltage:
 12.0/14.4kV
Secondary voltage:
 10.5/12.6, 21/25.2kV
 3 single-phase transformers combined

[Features and functions]

Gas-insulated transformaer

Marking switch

Marking switch

This switch is facilitated for precise timing control of short-circuit initiation.

[Specifications]

Rated voltage:
 14.4kV
Rated marking current:
 150kA(450kAp)

[Features and functions]

  1. Gas insulation
  2. Hydrauric actuator
  3. High-speed marking
  4. Very small scattering of marking time

Synthetic testing facilities

Synthetic testing facilities

These facilities are used for high-voltage circuit breakers which cannot be tested with only a short-circuit generator. The synthetic test is carried out by combining the facilities and the short-circuit generator.

[Specifications]

Capacitor bank as voltage source
 1200kV 8.3μF 6MJ
Capacitor bank for TRV circuit
 1650kV 1.64μF 2.2MJ

[Features and functions]

  1. Current injection method
  2. 4-parameter TRV waveform
  3. Power frequency recovery voltage

Digital control and measuring systems

Advanced digital control and measuring systems are used. The optically isolated digital measuring systems effectivery prevent mutual interferences in measured signal transmisson lines. Consequently, accurate maesurement can be obtained.

[Features and functions]

  1. Digital control systems (power generator operation, test sequence control)
  2. Optical isolated digital measuring system
    Resolution: 14bit, 100 MS/s, 16CH
  3. High speed digitizer
    Resolution: 12bit, 100 MS/s
  4. Automatic data acquisition system

Direct control desk
Direct control desk

Remote control desk
Remote control desk

Measuring and data analysys system
Measuring and
data analysys system