AC Series Resonant Test System

AC Series Resonant Test System
Applications
 
Resonant Test Systems is applied for the generation of a continuously variable alternating (AC) voltage of a fixed
frequency (mainly 50 or 60 Hz) for high-voltage (HV) routine, type and development testing of capacitive test
objects. They can also be applied for HV on-site tests, but POWER offers for that application the more economic
solution of frequency-tuned resonant test systems.
 
Capacitive test objects are cables, capacitors, gas insulated switchgear (GIS), but also large rotating
machines, instrument and power transformers (for applied voltage tests). Resonant test systems enable not only
HVAC tests at 50/60 Hz, but also at higher or lower frequency (10-300 HZ) and dynamic tests with fast
voltage changes (e. g. for capacitors). Because of their precise sine-wave, resonant test systems are very well
suited for the combinations of HVAC withstand tests with partial discharge (PD) measurement. POWER adapts the
resonant test systems to the requirements of the relevant standards and the demand of the customer.
The main advantage of resonant test systems is the low power demand, because only the losses in the test circuit
must be replaced from the power supply. The quality factor Q which is the relation between the test power S
and the loss power P ranges between Q = 10 and values up to 100, this means only 10 to 1 % of the test power
must be supplied. A resonant test system is remarkably lighter, cheaper and more economic than an AC
transformer test system and should be applied if the test objects are capacitive. In case of a disruptive discharge
the test object is not destroyed, because the systems goes out of resonance. POWER resonant test systems
are characterized by a very modern system configuration and have proven highest reliability.
  
Tunable inductance reactor modules for series resonant circuits are available between 250 and 1200 kV and test
power between 1000 and 20000 kVA
 
Tunable frequency modules for series resonant circuits are available between 100 and 1600 kV and test power
between 50 and 9000kVA.(Typical Frequency adjustment between 20-300 Hz)