HDXZ-270kVA/270kV Variable Frequency AC Resonant Test System is
applied for AC dielectric test for electric equipment.
cable 3km AC withstand test,capacitance≤1.1265uF,test
frequency:30-300Hz, test voltage 22kV, test time 5min;
cable 1km AC withstand test,capacitance≤0.1945uF,test
frequency:30-300Hz, test voltage 52kV, test time 60min;
cable 0.2km AC withstand test,capacitance≤0.0368uF,test
frequency:30-300Hz, test voltage 128kV, test time 60min;
4. 110kV/63000kVA Transformer AC withstand
test,capacitance≤0.02uF,test frequency:30-300Hz, test voltage below
160kV, test time 1min;
5. GIS 110kV, Switching busbar and other substation equipment, AC
withstand test,test frequency:30-300Hz, test voltage below 265kV,
test time 5minFeatures
With the function of over-voltage, over-current, zero-start, system
detune (flashover) protection. Over-voltage, over-current
protection value can be set accordingly to user’ need. Flashover
protection action when the test object flash over and tester
records the flashover voltage value for testing analyze.
Small volume, light weight, very suitable for the operation people
on the spot.
There are three kinds of working modes, which is convenient for
user choosing according to on-site condition. Working
modesAutomatic mode, Manual mode, Automatic tuning manual boost
Data can be stored and printed in different places, and the series
numbers are figures which is convenient for identification and
When the device automatically sweeps the frequency, the starting
point of frequency can be set arbitrarily in the specified range.
Meanwhile, the LCD screen displays the scanning curve, which is
convenient for users to directly understand whether the resonance
point is found .
Adopting DSP technology, which can increase and decrease functions
and updated accordingly to the user’s need, it also makes the
human-machine interface more humanized.
Reduced greatly the required power capacitance , resonant equipment
power can generate high voltage and large current by using the
resonance of resonant reactor and test capacitor. Power can supply
the loss power in the system , which only requires 1/Q of the
resonant excitation power during the test .
Reduced greatly weight and dimension of the equipment . The series
resonant power supply not only eliminates the bulky high-power
voltage regulator and ordinary high-power frequency test
transformer, but also requires the 1/Q of the resonant excitation
power to reduce the weight and dimension of the system, which is
generally 1/10-1/30 of the common test device.
Improve the output of voltage wave .The resonant power supply is a
resonant filter circuit, which can improve the waveform distortion
of output voltage and get the good sinusoidal waveform effectively
preventing the error breakdown of the harmonic peak to the test
Prevent large short circuit current burn fault point. When test
object is breakdown in the series resonant state the circuit is
detuned immediately and the circuit current drops rapidly to the
1/Q of normal tested current .The breakdown current increase to
dozens of time during power frequency withstand test of
transformer. Compared with two test methods , short current and
breakdown current is hundreds of times different . Resonance test
equipment can efficiently find the insulation weakness and large
short circuit current burn fault point.
No-recovery over-voltage . When test object is break down , high
voltage immediately disappear also immediately extinguished due to
the loss reasonance condition. It takes a long time to recovery
flashover voltage before cutting off the power .This voltage
recovery process is a kind of energy accumulation of intermittent
oscillation process, there is no any recovery over-voltage in the
process .Test equipment combination mode
|Combinations of equipment|
|Reactors（44kVA/22kV, 4 sets ）||Excitation transformer output selectio|