Judgment and Solution of Three-Phase Unbalance

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Three-phase unbalance is an important indicator of power quality. Although there are many factors that affect the power system, the normal unbalance is mostly due to three-phase components, line parameters or load asymmetry. Since the factors of the three-phase load are not certain, the three-phase

Common Problems of Transformer Core

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1. Hazards, causes and types of transformer core multi-point grounding faults1. The hazards of multi-point grounding faults in the iron coreWhen the transformer is in normal operation, it is not allowed to ground the iron core at multiple points, because in the normal operation of the transformer, t

Why should the impact test be done before the transformer is put into operation

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Shock testing is not a power system term. It is generally a test method to determine the safety, reliability and effectiveness of military and civilian equipment when they are subjected to external force impact or action. The impact test in electrical engineering generally includes operation impact

Knowledge About Relay Protection

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1. Basic principlesThe relay protection device must have the function of correctly distinguishing whether the protected element is in normal operation or has a fault, whether it is a fault in the protection zone or a fault outside the zone. To realize this function, the protective device needs to be

PLC Selection Considerations

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1. PLC manufacturersTo determine the PLC manufacturer, you should mainly consider the requirements of equipment users, the designer's familiarity and design habits with PLCs from different manufacturers, the consistency of supporting products, and technical services. Considering the reliability