Core failure is mainly caused by two reasons
2016/11/13 view:
During normal operation of the transformer, there is an electric field between the charged windings and the tank, while the core and other metallic components are in the electric field. As the capacitance distribution, field strength varies, if the core is not * ground, will produce charge and discharge phenomena, destruction of solid insulation and oil dielectric strength, so the core must have a little * ground.
Core composed of silicon steel sheet, in order to reduce the eddy current, the chip has a certain insulation resistance (usually only a few ohms to tens of ohms), due to great inter-chip capacitance in the alternating electric field can be seen as access, which core In only a little ground can be laminated to the core laminations potential clamped to ground potential.
When the core or metal components such as two or more than two points (multi-point) grounding, the ground will cause a closed loop, the key chain part of the magnetic flux, induced electromotive force, and the formation of loops, resulting in local Overheating, and even burned iron core.
Transformer core only one point ground, is the normal * ground. The core must be grounded and must be grounded.
Core failure is mainly caused by two reasons: First, the construction process caused by poor short circuit, the second is due to accessories and external factors caused by multi-point grounding.
Core composed of silicon steel sheet, in order to reduce the eddy current, the chip has a certain insulation resistance (usually only a few ohms to tens of ohms), due to great inter-chip capacitance in the alternating electric field can be seen as access, which core In only a little ground can be laminated to the core laminations potential clamped to ground potential.
When the core or metal components such as two or more than two points (multi-point) grounding, the ground will cause a closed loop, the key chain part of the magnetic flux, induced electromotive force, and the formation of loops, resulting in local Overheating, and even burned iron core.
Transformer core only one point ground, is the normal * ground. The core must be grounded and must be grounded.
Core failure is mainly caused by two reasons: First, the construction process caused by poor short circuit, the second is due to accessories and external factors caused by multi-point grounding.
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