Power Transformer 200kva by 15kv to 0.4kv

power transformer 200kva by 15kv to 0.4kv is a type of power transformer with a rated capacity of 200 kva, an input voltage of 15 kv, and an output voltage of 0.4 kv.

Our company uses high magnetic conductivity oriented silicon steel, which is further processed into high quality cold rolled silicon steel sheets and then stacked together. Using foil for winding coils and new insulation materials and processes,power transformer 200kva by 15kv to 0.4kv features high temperature resistance, shock resistance, and a fully sealed structure design.

The design of the fully sealed structure ensures stable transformer oil quality, extends the maintenance cycle, and at the same time, the overall oil tank composed of corrugated sheet type heat sinks is produced using phosphating and multi layer anti rust spraying processes, which has excellent weather resistance.

The connection group of the power transformer 200kva by 15kv to 0.4kv is Dyn11, which reduces the impact of harmonics on the power grid and improves the power supply quality.

Technical parameter:

Q:What inspection items should apower transformer 200kva by 15kv to 0.4kv undergo before leaving the factory?

A:To ensure the stable and efficient operation of the transformer, a series of tests will be conducted on the transformer before it is manufactured. For the DC resistance test, measure the DC resistance of the three phase windings of high and low voltage, check the three phase balance rate, and troubleshoot broken wires and poor soldering. For the voltage ratio test, measure the actual 15kV/0.4kV ratio, confirm the accuracy of the tap position and there is no error in the number of turns. For the insulation resistance test, use a multi function meter to measure the insulation between high and low voltage and between high and low voltage and ground, and determine if the insulation is qualified. The power frequency withstand voltage test passes the withstand voltage test between high and low voltage to ground, between low voltage to ground, and between high and low voltage, to assess the insulation strength, etc.

Q:Why is it necessary to conduct the impulse closing test on newly installed or over hauled power transformers 200kva by 15kv to 0.4kv before they are put into operation?

A:Removing the no load transformers in the power grid will cause operational over voltage. In a small current grounding system, the amplitude of this over voltage can reach 3 to 4 times the rated phase voltage; in a large grounding system, the amplitude of the operational over voltage can also reach 3 times the rated phase voltage. Therefore, in order to test whether the insulation of the transformer can withstand the rated voltage and the operational over voltage during operation, several impulse closing tests should be conducted before the power transformers 200kva by 15kv to 0.4kv is put into operation.

In addition, when the no-load transformer is put into operation, an excitation surge current will be generated, with a value that can reach 6 to 8 times the rated current. Since the excitation surge current will generate a large electrodynamic force, conducting the impulse closing test is also an effective measure to consider the mechanical strength of the power transformers 200kva by 15kv to 0.4kv and whether the relay protection will malfunction.

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