DBXZ Variable Frequency AC Resonant Test System

AC resonant test systems are mainly used to output AC voltage for high voltage routine, type and development testing of capacitive test objects. These systems exert the principle of series resonance, as per f=1/2π√LC, the connection of HV reactors (inductance L) to a capacitive loads (capacitance C) form an oscillating circuit with the frequency (f) of power supply.

Compared to conventional AC test transformers, the relatively lower power required (1/Q), smaller dimension and lighter weight favor these systems as the most practical for field testing, and large capacitance loads.

DBXZ Variable Inductance Resonant Test Systems are designed to compensate capacitance in testing circuit precisely by adjusting inductance of HV reactors, when test system gets in resonance, it outputs continuous AC voltage of power frequency (mainly 50 or 60Hz, matches feed-in mains), voltage up to 2000kV.

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Description

Main technical parameters

1. Power supply: AC 380V / 50Hz (can be customized)

2. Rated output voltage: up to 2000kV

3. Rated output current: as requested

4. Rated frequency: 50Hz / 60Hz

5. Output phase: single phase

6. Waveform of output voltage: sine wave, distortion ≤1%

7. Quality factor Q: up to 100

8. Duty cycle: as requested

9. Insulation level: withstand voltage 1min at 110% rated voltage

HV resonant reactor with variable inductance

DBXZ series HV reactors, main part of the system, work on fixed frequency and variable inductance, are of oil insulation and epoxy glass-fiber insulating shell, module type and stackable, voltage up to 2000kV.

Application

These systems are ideal for field commissioning test of power cables and GIS/GIL.

Power Cables

GIS/ GIL / AIS Switchgears

HV Bushings

Transformers

CT, PT , CVT

Other HV Apparatus

Applications covered include testing according to IEC, ANSI/IEEE and other national standards.

Basic components	Optional
Variable frequency power supply (including control unit) Exciter transformer HV reactor Capacitor divider	Switchgear cabinet Compensation reactor Blocking impedance Power line filter HV filter etc

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