3 Waveforms 400kV 800kV 1200kV Withstand Voltage Generator HV Lightning Impulse Voltage Test Device

• After-sales Service: 24/7. All Time Zones Friendly
• Warranty: 1 Year
• Product Name: Lightning Impulse Voltage Generator
• Ray waves: ≥85%
• Operating wave: ≥80%
• Nominal voltage: 300 kV to 4800 kV
• Model NO.: VSJC-Y1200
• Rated voltage: ± 150kV to 1200 kV
• Rated capacitance: 0.325 to 1.0 μF
• Impact energy: 7.31 to 480 kJ
• Transport Package: Wooden Box with Foam Inside
• Specification: VSJC-Y400: Lightning Impulse Voltage Generator
• Trademark: Weshine
• Origin: China Hebei
• HS Code: 8504210000
• Production Capacity: 300 Pieces/Per Month

Product Description

Product Description

Lighting is a common phenomenon in transmission lines because of their tall height. This lightning stroke on the line conductor causes impulse voltage. The terminal equipment of transmission line such as power transformer then experiences this lightning impulse voltages. Again during all kind of online switching operation in the system, there will be switching impulses occur in the network. The magnitude of the switching impulses may be about 3.5 times the system voltage. Insulation is one of the most important constituents of a transformer. Any weakness in the insulation may cause failure of transformer. To ensure the effectiveness of the insulation system of a transformer, it must confirms the dielectric test. But the power frequency withstand test alone can not be adequate to demonstrate the dielectric strength of a transformer. That is why impulse test of transformer performed on it. Both lightning impulse test and switching impulse test are included in this category of testing.

 

From the data compiled about natural lightning, it may be concluded that the system disturbance due to natural lightning stroke, can be represented by three basic wave shapes.

 

* Full wave

* Chopped wave and
* Front of wave

 

Although the actual lightning impulse disturbance may not have exactly these three shapes but by defining these waves one can
establish a minimum impulse dielectric strength of a transformer.

If lighting disturbance travels some distance along the transmission line before it reaches the transformer, its wave shape may approach to full wave. If during traveling, if flash-over occurs at any insulator of the transmission line, after the peak of the wave has been reached, the wave may become in form of chopped wave.

 

If the lightning stroke directly hits the transformer terminals, the impulse voltage rises rapidly until it is relieved by a flash over. At the instant of flash-over the voltage suddenly collapses and may form the front of wave shape.

The effect of these waveforms on the transformer insulation may be different from each other. We are not going here in detail discussion of what type of impulse voltage waveforms causes what type of failure in the transformer. But whatever may be the shape of lightning disturbance voltage wave, all of them can cause insulation failure in the transformer. So lighting impulse test of transformer is one of the most important type test of transformer.

For regulatory requirements and operator safety, it is necessary to know the levels of insulation in the transformers. Weshine has 8 years experience specifically for deal with complete range of Lightning Impulse Test Equipment.

For further information on Weshine's Service Solutions, contact our 24/7 online sales representative.

Product Name	Lightning Impulse Voltage Generator
Model Number	VSJC-Y400
Nominal Voltage	300 to 4800 kV	Rated Voltage	± 150  ~ 1200 kV
Rated Capacitance	0.325 to 1.0 μF	Impact Energy	7.31 to 480 kJ
Ray Waves	≥85%	Operating Wave	≥80%
Typical Application	Testing of: Power transformer, Cable, Arrester(impact current test), Generator, Motor, Insulator, Casing, GIS, Transformer, Capacitor, Other insulating materials, Scientific research and teaching

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