Oil immersed top core current transformers (420-550kV)

Oil immersed top core current transformers Niroutrans

For very high voltage, over 300KV, the AOK type current transformer of the top core, or inverted type wil be more cost effective. In the AOK, the cores are located in a strong aluminium housing, which is supported by a steel tube.
The insulation is mostly machine wound to ensure a high and uniform quality. The oil expansion is contained by a bellow system, made of aging synthetic rubber.

Some of the feature of this type of transformers are as follows:

1- Small dimensions, minimum oil content and low cost as a result of economic design.
2- Horizental transport. During transportation the bellows system is arranged in a safe position.
3- No maintenance.
3- A Phoenix terminals is used for the secondary terminals. Maximum cross section of the wire is 10mm2.

Production Capacity:

100 units of inverted type transformers per year.

Describtion	Quantity
Max. Voltage (kV)	420
Power frequency withstand voltage (kV)	630-680
Primary Rated Current (A)	Up to 3000
Secondary Rated Current (A)	1,5
Metering Cores Number	Up to 2
Protection Cores Number	Up to 4
Rated Frequency (Hz)	50
Max. height	5627