Product introduction
UHV Impulse Voltage Generator, also known as a Lightning Impulse Voltage Tester, is designed to generate high-voltage pulse waveforms that simulate real-world surge conditions.
For manufacturers and testing laboratories involved with transformers, GIS, high-voltage switchgear, power cables, surge arresters, and other high-voltage equipment, impulse voltage testing is often a mandatory requirement under IEC and IEEE standards.
The purpose of the test is to verify whether the insulation system can withstand transient overvoltages, such as those caused by lightning strikes or switching operations. By identifying insulation weaknesses before equipment is put into service, manufacturers can reduce the risk of equipment failure, prevent costly outages, and help ensure the safety of both personnel and electrical systems.
Technical Parameters
| Charging voltage | Setting range | 0 ~ 100kV |
| Scope of work | 10.0~100.0kV | |
| Setting deviation | ≤±1% | |
| Instability degree | ≤±1% | |
| Setting resolution | 0.1kV | |
| Charging time | Setting range | 30~180s |
| Setting resolution | 1s | |
| Alarm delay | 2s | |
| Number of pressure | Setting range | 1~999 |
| Protection setting | Overcurrent protection value | configurable |
| Overvoltage protection value | configurable | |
| Dynamic charge protection | Can be Selected | |
| Output impact stability | Greater than 99% | |
| Number of voltage boosting | setting range | 1~999 |
Core Function & Purpose of high voltage impulse generator
Verify whether the insulation design is reliable
Even if electrical equipment can withstand long-term power-frequency voltages such as 10kV, 35kV, 110kV, 220kV, or even 500kV, that does not mean it can handle the short-duration surge caused by lightning impulses.
A high voltage impulse generator is used to reproduce these transient overvoltage conditions and check whether key insulation parts meet the design requirements, including main insulation, inter-turn insulation, inter-layer insulation, lead insulation, and bushing insulation.
Simulate real lightning conditions
Power systems are frequently exposed to lightning strikes during operation. These events generate standard 1.2/50 μs lightning impulse waves, where the voltage reaches its peak in 1.2 μs and drops to 50% in 50 μs.
High voltage impulse generators are designed specifically to produce this standard waveform, allowing real-world lightning conditions to be reproduced in a controlled test environment.
Detect hidden insulation defects
Many insulation problems cannot be detected during power-frequency withstand tests, such as small air gaps, sharp-point discharge points, insulation layer defects, or areas with concentrated electric fields.
Under lightning impulse conditions, these weak points may lead to flashover, breakdown, or a sharp increase in partial discharge activity. Impulse testing helps reveal these risks early, before the equipment is put into service.
Typical Application Scenarios of impulse voltage test system
1.Lightning impulse withstand voltage testing on power transformers (especially HV windings).
2.Lightning impulse withstand voltage testing on high-voltage switchgear (circuit breakers, GIS).
3.Lightning impulse flashover testing on insulator strings and bushings (porcelain, composite).
4.Nominal discharge current impulse withstand and residual voltage testing on surge arresters (MOA) (requires a separate high-current circuit).
5.Lightning impulse withstand voltage testing on power cables and accessories.
6.Research on impulse breakdown characteristics of insulating materials (solid, liquid, gas).
Frequently Asked Questions of impulse voltage test system
1. What is a lightning impulse voltage generator?
A lightning impulse voltage generator is a high-voltage testing equipment used to generate high amplitude, short duration impulse voltages. It mainly simulates transient overvoltages such as lightning strikes and is used to assess the impulse insulation level of power equipment.
2. What equipment is the high voltage impulse generator mainly used for testing?
Mainly used for impulse voltage testing of equipment such as power transformers, power transformers, high-voltage switches, circuit breakers, combination devices, lightning arresters, power cables and accessories, bushings, and insulators.
3. What waveforms can a high voltage impulse generator generate?
The UHV series high voltage impulse generator can generate standard lightning impulse full wave, lightning impulse cutoff wave, and operational impulse wave, which are used to simulate different types of transient overvoltages.
4. What is the difference between lightning impulse full wave and truncated wave?
Lightning impulse full wave is used to simulate the impulse voltage generated by typical lightning strikes; Wave truncation refers to the rapid truncation of shock waves after a certain period of time, which can be used to assess the insulation performance of equipment under more stringent impact conditions. The cutoff time can be controlled by a cutoff device.
5. Can the charging voltage of the high voltage impulse generator be adjusted?
Okay. By controlling the charging voltage of the impulse voltage generator, the amplitude of the final output impulse voltage can be adjusted; The specific output amplitude is also related to the number of stages used and the efficiency of the equipment.
6. What charging method does the device use?
The UHV series adopts constant current charging automatic control technology, which has the characteristics of convenient wave adjustment, simple operation, good synchronization performance, and reliable action.
7. Can the equipment undergo automated testing?
Okay. The high voltage impulse generator adopts PLC fully automatic control, which can achieve functions such as constant current voltage regulation and continuous cycle testing, and supports manual/automatic modes.
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