Soft starters for the LNG Industry

Driving 8 cargo pumps and 2 chilling compressors
Motor ratings: 6600V, 2x105A & 8x52A
LNG – northwest Swan

Solcon's HRVS-DN, 6.6KV, 105A & 4x52A in a multi-start configuration

The long time success of the multi-start design solution on board LNG carriers

brought Samsung Heavy industries to continue their successful design.

The Northwest Swan is equipped with the same multi-start design as all other SHI LNG carriers.

Cargo pumps circulate Liquid Natural Gas at -170oC. When starting, the initial friction at such temperatures cause hazardous starting conditions. The four cargo pumps are soft started by the HRVS-DN, thus, eliminating high inrush current and torque surge.

Utilizing a dual-adjust curve, the chiller compressor uses the same soft-starters' current limiting curve, to eliminate its high inrush current and the consequential voltage drop, thus, providing ship wide voltage stability.

The Motor Protection package built into the HRVS-DN ensures that beyond the elimination of high inrush current, mechanical torque and pressure surges, the motor will be protected from numerous failures such as shear-pin, under voltage and ground fault to name just a few.

Northwest Swan equipped with 2x6.6KV HRVS-DN soft-starter in a redundant multi-start configuration.