This impulse test system is used for carrying out full wave lightning impulse voltage tests on HV apparatus such as clearance, bushings, capacitors, switches, power transformers (capacity below 5000kVA), CT/PT at 35kV or below.
Specifications
Nominal voltage: ±300kV
Rated energy: 30kJ(5kJ/stage)
Impulse capacitance: 0.666µF
Number of Stage: 3
Charging voltage per stage: ±100kV
Rated level capacitance: 2µF (each impulse capacitor 2µF at 100kV, total 3pcs)
Output voltage waveform: (Load capacitance is 300-3000pF)T1= 1.2µs±30%, T2=50µs±20%, peak voltage error≤3% standard lightning impulse voltage full wave.
Impulse voltage waveform parameters and error are accorded with national requirements of GB311.1and GB16927.1 standard and IEC standard.
Output Voltage Efficiency: Standard lightning wave ≥90% when load capacitance is below 1000pF, standard lightning wave ≥85% when load capacitance is below 2000pF.
Locking range: level voltage is within the range of 20%-100% of rated voltage, positive and negative locking range no less than 25%.
Out-of-control rate of synchronous discharge: <5%
Min. output voltage: ≥±10% of rated voltage.
Instability of charging voltage: <±1.0%
Continuous time: Above 2/3 of rated voltage, continuous working when charge anddischarge once every 120s. Below 2/3 of rated voltage, continuous working when charge and discharge once every 60s.
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