20 MVA 20000 KVA 132KV To 11KV Three Phase Power Transformer with OLTC

Oct 31, 2025

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The capacity of this on-load-tap-changer Oil Immersed transformer is 20000 KVA, the HV of this power transformer is 132KV and LV is 11KV. This oil immersed transformer is equipped with an Huaming brand on load tap changer(OLTC) at 132KV side to regulate the HV automatically.

The 20 MVA power transformer was designed in advanced technology and adopts high quality material and components which result in reliable quality and long operation time. The witness factory acceptance test of the transformer was approved by the end user, all the test data was qualified with the standards and our design.

What is on-load tap changer for transformers?

On-load tap changer (OLTC), also known as On-circuit tap changer (OCTC),

The purpose of a tap changer is to regulate the output voltage of a transformer. It does this by altering the number of turns in one winding and thereby changing the turns ratio of the transformer. There are two types of transformer tap changers: an on-load tap changer (OLTC) and no-load tap changer (NLTC), Not all of the transformers are equipped with tap changer.

We have also exported 20mva transformers to South Africa in 2023.

Model	SZ11-20 MVA-132/11KV
Type	Oil Immersed Power Transformer
Standard	IEC60076
Rated Power	20 MVA
Frequency	50 HZ
Phase	Three
Cooling Type	ONAN
Primary Voltage	132 KV
Secondary Voltage	11 KV
Winding Material	Copper
Vector Group	YNd1
Impedance	11%
Tap Changer	OLTC
Tapping Range	132+4/-12*1.25%
No Load Loss	21 KW
On Load Loss	112.5 KW
Accessories	Standard Configuration
Remarks	N/A