Product Overview
The HMCJ 300kV 15kJ impulse voltage generator is a device that produces impulse voltage waves. It is used to test the insulation performance of electrical equipment against atmospheric overvoltages and switching overvoltages. The generator can produce standard lightning impulse voltage waveforms, truncated lightning impulse voltage waves, standard switching impulse voltage waveforms, and user-specified non-standard impulse voltages, including steep-fronted pulses.
Product Model Numbering Guide
circuit Diagram
The main circuit of the HMCJ series impulse voltage generator is as follows:
HMCJ-I Type
Name Description:
T: Charging Transformer
D1 D2: High-Voltage Silicon Rectifier
K1 K2: Automatic Grounding Switch
R01 R02 R03: Charging Protection Resistors
R1, R2: DC Resistor Voltage Divider
CP: Coupling Capacitor
R0: Triggering Resistor
C: Main capacitor
R: Charging resistor
R': Charging clamping resistor
Rt R,t: Tail wave resistor
Rf R,f: Leading edge resistor
R'f: Operating wave leading edge resistor
C1'C1'': Trigger capacitor voltage divider
C's0: Ignition capacitor
C0: Series discharge ball gap
R0': Trigger ball clamping resistor
G'0: Isolation ball
R0: Divider damping resistor
C0 C0': Weak damping capacitive divider
C0'': Low-voltage arm of capacitive divider
C3: Steepening capacitor
r1: Damping resistor for clipping voltage-balancing capacitor
C´1: Clipping voltage-balancing capacitor
R2 R´2: Clipping trigger voltage-dividing resistors
G0'': Clipping spark gap
G: Test specimen
Z0: Clipping delay element
Technical Parameter
1 Rated Class Voltage ±100kV
2 Output Voltage Waveform
2.1 Under different rated voltages and with a specified load capacitance, it can generate a full-wave 1.2/50μs lightning impulse voltage.
2.2 Utilizing a multi-ball clipping device, a lightning impulse voltage clipping with a clipping time of 2 to 6 μs can be obtained, with a standard deviation of clipping time dispersion not exceeding 150 nS.
3 Voltage Utilization Factor: When equipped with appropriate surge capacitors for different load capacitances, the utilization factor for generating 1.2/50μs lightning impulse voltage waves is no less than 0.85.
4 Operating Duration: Continuous operation is maintained with one charge/discharge cycle every two minutes at voltages above 2/3 of rated voltage. At voltages below 2/3 of rated voltage, continuous operation is maintained with one charge/discharge cycle per minute.
Precautions
1. The main circuit power supply must meet the maximum capacity requirements.
2. All grounding must be implemented as true single-point grounding.
3. All wave-adjusting resistors must not be dropped, knocked over, or stepped on.
4. Insulating cylinder supports must not be struck or scratched; capacitors must not be impacted by heavy objects.
5. Transformers and capacitors must not be used when low on oil.
6. The entire equipment must not be used or stored when the ambient air temperature is below -25°C.
7. Copper ball surfaces must show no scratches or impact marks.
8. Equipment must not be used in an inclined position.
9. The entire system must not be exposed to ice, water, snow, or fog. Indoor equipment must not be stored or used outdoors.
10. After testing, the control console key must be removed and kept by a designated person. This equipment must be operated only by authorized personnel.
11. Before using this apparatus, carefully read this manual, especially strictly adhering to the requirements specified in items 6 and 7.
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