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Audited Supplier This impulse test system is used for carrying out standard lightning impulse voltage full wave and operation wave tests on HV apparatus such as power capacitors, clearance, bushings, power transformers and CT/PT at10kV or below.
Operation Conditions
| Altitude | £1000m |
| Ambient Temperature | -5ºC~+45ºC |
| Max. daily temperature difference | ≤25ºC |
| Relative humidity | ≤90%(20ºC) |
| Antiseismic ability | ≤7degree |
| Horizontal accelerate 3.0m/s2, vertical accelerate 1.5m/s2 | |
| Power voltage is sine waveform, harmonic distortion <3% | |
| One reliable GND, ground resistance <0.5 ohm | |
| Usage environment | indoor |
System instruction
Main Parameters for System
| Nominal voltage | ±200kV |
| Rated level voltage | ±100kV |
| Rated energy | 10kJ |
| Impulse capacitance | 0.5µF |
| Number of Levels | 2 |
| Rated level capacitance | 1µF (each impulse capacitor 1µF at 100kV, total 2 pcs) |
| Impulse voltage waveform | generated when load capacitance is 300-3000pF. T1=1.2µs±30%, T2=50µs±20%, standard lightning impulse voltage full waveform of peak voltage deviation≤3% |
| Standard operation waveform 250±20%/2500±60%. These 2 Impulse voltage waveform parameters and error are accorded with national requirements of GB311.1and GB16927.1 standard and IEC standard. | |
| Voltage utilization factor: Standard lightning impulse voltage waveform ≥90% when load capacitance is below 1000pF, standard operation impulse voltage waveform 80% when load capacitance is below 2000pF. Standard operation impulse voltage waveform ≥70%. | |
| Locking range | level voltage is within the range of 20%-100%rated voltage, positive and negative locking range no less than 25%. |
| Out-of-control rate of synchronous discharge | <5% |
| Min. output voltage | ≥±20% of rated voltage |
| Instability of discharge voltage | <±1.0% |
Continuous time |
Above 2/3 of rated voltage, continuous working when charge and discharge once every 120s. Below 2/3 of rated voltage, continuous working when charge and discharge once every 60s. |
System Configuration
1. Charging Device
Constant current charging device, rated output voltage±100kV, rated output DC current 10-100mA.
Oil type charging transformer, primary voltage is 220V, secondary voltage is 50kV, rated capacity is 5kVA. No oil leakage of transformer.
2DL-200kV/100mA HV rectifying silicon stack(HV diode), reverse voltage³200kV, average current ³0.1A. HV diode is installed on the charging board.
Protective resistor of HV diode is made of enameled resistance wire.
Instability of charging voltage ±1% at 15%-100%rated charging voltage of constant charging device. The adjustable accuracy of charging voltage is 1%.
DC resistance voltage divider 100kV, 200mohm, with HV vitreous glaze resistor. LV resistor is installed at the bottom of divider, while the voltage signal of LV side is lead to measurement system by shield cable.
Automatic earth switch is open and close by electromagnet. Automatically short-circuit main capacitor and ground by protective resistor when testing stops.
Charging transformer, HV silicon rectifier, resistance divider, charging current-limiting resistor and main controller are installed in the same movable chassis. Change the polarity automatically.
The device is not only used as charging power supply of impulse voltage generator, but also as DC voltage generator to generate 100kV DC voltage, which can be used in DC test for other apparatus.
2. Impulse Voltage Generator
The generator is "H type".
Voltage boosting charging loop circuit, each level rated voltage is 100kV.
2levels tower structure for insulation support. Each level includes 1 piece MWF100-1 metalshell oil type pulse capacitor, charging resistor, front wave resistor, end wave resistor and ignition sphere gap. When lightning wave is generated, select suitable wave-front resistor, waveend resistor and level according to the capacitance of test object.
Unit pulse capacitor is 1±0.05mF, DC working voltage is ±100kV, capacitor rest inductance £0.15mH. The capacitor bushings have vertical tension ability in 15kg, and to ensure no damage and oil leakage, the capacitors installation without def ormation.
Front wave resistor, end wave resistor are all slab structure, reeled without inductance. Resistor with the special structure of Siemens, and ensure the resistor heat capacity can satisfy the requirements of tests. The rest inductance is small.
Connectors are spring pressure welding type, which is reliable contact and convenient for plug-in and out in wave adjustment.
Bracket of wave-front and wave-end resistor can be used for several resistors in parallel.
The 1st sphere gap is triggered by doubling piece heteropolarity. The 2nd sphere gap are ignited with three gaps sphere gap, ensure reliable triggering.
The distance of each level sphere gap is linear adjusted by slow permanent magnet motor. Low noise, location in noninertia, accurancy, quick, display the discharging voltage of sphere gap.
Sphere gap distance can be adjusted by manual.
First level and second level can be used in parallel.
The support is made of fiberglass. Part of the highest potential is anti-age and anti-corona.
Each level is anti-corona. No obvious corona during charging.
3. 200kV Weak Damped Capacitive Impulse Voltage Divider
There is single capacitor in HV(high voltage) arm.Rated is 200kV/300pF.
Rated lightning impulse withstand voltage is 200kV.
Divider voltage ratio: 1000:1
Uncertainty of scale factor: Kε≤1%
Overshoot: β≤20%
Portion response time: ≤100ns
The square wave of Weak Damped Capacitive Voltage Divider meets requirement of GB311 standard.
4. ATC-2 Control Unit (PLC)
PC intergrated the measurement and control function together.
15' LCD screen
oscilloscope Tektronix.
Control unit signal transmisstion via optical fiber.
Waveform display, analysis, mapping, printing and etc functions.
Setting measurement parameters according to high voltage test, then automatic setting the digital oscilloscopeaccordingly.
With anti-interference technology.
Control unit grounded automatically.
Control and display the distance of chopping wave sphere.
Impulse times presetting and automatic polarity changing functions.
Automatic alarm.
Constant current charging.
Adjust charging voltage and time accroding to the test requirement and display the charging voltage value.
Charging stability: 0.3%.
Charging speed: fast and slow can be selected.
Emergency brake.
5. Control unit technical parameters:
| Charging voltage setting range | 0.0~200.0 kV |
| Charging voltage | 10.0~200.0kV |
| Charging voltage instability | < 1.0 % |
| Charging voltage adjustment accuracy | 1.0% |
| Charging time setting range | 30~60S |
| Charging time adjustment accuracy | 10S |
| Delay time of alarm | 2S |
| Delay time of ignition pulse | 0.0~9.9μS |
| Delay time of ignition pulse adjustment accuracy | 0.1μS |
| Impulse test number test range | 0~99 times |
| Impulse test number adjustment accuracy | 1 time |
| Input power voltage | 220 VAC±10% |
| Output AC voltage | 10~220 VAC(continous) |
| Output AC current | 0~100 A |
Double-shielded measurement cable
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Audited Supplier 
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