Tank Type Current Transformer (IMB)
IMB tank type (hairpin design) current transformers are very flexible, with regard to core space. The primary conductor is insulated with a special paper, which gives a high insulation resistance, low dielectric losses and good aging properties. The core are located in the bottom tank, and the complete transformer is filled with a unique mixture of quartz sand and oil. A a result of this filling, it has been possible to design an expansion system entirely without moving parts. Some of the features of this type of transformers are as follows:
Unique filling composition, oil together with pure quartz-grains, resulting in compact design with small oil volume.
Hermetically sealed which means no need for regular maintenance procedures.
No oil change required as expansion room is filled with nitrogen, without moving parts.
All external parts are made of aluminium and stainless steel.
High seismic withstand capability.
Freedom in the number and size of cores.
Sand supports cores & primary winding.
Simple installation & minimal maintenance.
Hermetically sealed which means no need for regular maintenance procedures.
No oil change required as expansion room is filled with nitrogen, without moving parts.
All external parts are made of aluminium and stainless steel.
High seismic withstand capability.
Freedom in the number and size of cores.
Sand supports cores & primary winding.
Simple installation & minimal maintenance.
| Description | I | II | III | IV |
|---|---|---|---|---|
| Power frequency witdstand voltage(kV) | 140 | 275 | 460 | 680 |
| Primary rated current(A) | Up to 3000 | Up to 3000 | Up to 3000 | Up to 3000 |
| Secondary rated current(A) | 1-5 | 1-5 | 1-5 | 1-5 |
| Meeting Cores Number | Up to 2 | Up to 2 | Up to 2 | Up to 2 |
| Protection Cores Number) | Up to 4 | Up to 4 | Up to 4 | Up to 4 |
| Rated Frequency(Hz) | 50 | 50 | 50 | 50 |
| Highest system voltage(kV) | 75 | 145 | 245 | 420 |