Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

Placing a coil group in the wrong position can have a number of adverse effects on the functionality and safety of the device, depending on the role of the coil group and the type of device on which it is located. Here are some possible effects:Electrical performance problem Reduced magnetic flux: If the coil is not positioned correctly, it may lead to reduced magnetic flux, affecting the efficiency of the transformer or motor. Magnetic field asymmetry: The wrong position can lead to magnetic fi

Protection measures for use of three-phase transformersThree-phase transformer may encounter various faults and abnormal working conditions during use, in order to ensure its safe and stable operation, a series of protective measures are usually taken. The following are several common protection measures for three-phase transformers according to the search results:Gas protectionGas protection is a protective measure used to reflect the internal failure of the transformer tank and the reduction o

Three phase transformer common connection group

What is Transformation Ratio?Transformer conversion ratio refers to the proportional relationship between the number of turns between the primary and secondary windings of the transformer, which determines the voltage conversion capability of the transformer. The conversion ratio is one of the most basic characteristics of a transformer and is used to describe how the transformer changes the input voltage to the output voltage.DefinitionThe conversion ratio of the transformer is defined as the r

What is a Transformer Tap?Transformer tap definitionThe transformer tap refers to a number of connection points set on the winding of the transformer, allowing the transformer ratio (voltage ratio) to be adjusted by changing the number of effective turns of the winding, so as to achieve the regulation of the output voltage. The use of transformer taps can greatly improve the flexibility and reliability of the power system, especially when voltage levels need to be adjusted or in response to load

Winding Resistance Test DefinitionThe winding resistance test of a transformer checks the health of transformer windings and connections by measuring resistance.Procedure of Transformer Winding Resistance MeasurementFor star connected winding, the resistance shall be measured between the line and neutral terminal.For star connected autotransformers the resistance of the HV side is measured between HV terminal and IV terminal, then between IV terminal and the neutral.For delta connected windings,

Temperature Rise Test DefinitionA temperature rise test of a transformer checks if the temperature increase of its winding and oil meets specified limits.Temperature Rise Test for Top Oil of Transformer First, the LV winding of the transformer is short-circuited. Then one thermometer is placed in a pocket in the transformer top cover. Other two thermometers are placed at the inlet and outlet of the cooler bank respectively. The voltage of such value is applied to the HV winding that power input

Dielectric Test DefinitionThe dielectric test of a transformer checks the insulation’s ability to handle voltage without breaking down.Separate Source Voltage Withstand Test of TransformerThis dielectric test checks the main insulation’s ability to withstand voltage between the winding and the earth.Procedure All three line terminals of the winding to be tested are connected together. Other winding terminals not under test and the transformer tank should be connected to the earth. Then a single-

Vector Group Test DefinitionThe vector group test of a transformer checks the phase sequence and angular difference to ensure transformers can operate in parallel.Vector Group Test of TransformerThe vector group of a transformer is essential for successful parallel operation of transformers. Every electrical power transformer must undergo a vector group test at the factory to ensure it matches the customer’s specified vector group.The phase sequence, or the order in which phases reach their peak

Transformer DefinitionA transformer is defined as an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.Theory of Transformer on No-LoadHaving No Winding Resistance and No Leakage ReactanceConsider a transformer with only core losses, meaning it has no copper loss or leakage reactance of transformer. When an alternating current source is applied to the primary, it supplies current to magnetize the core of transformer.But this current