Metallurgical Industry Voltage Sag Mitigation Case
The customer is a metal smelting enterprise operating large-scale equipment such as semi-autogenous mills and ball mills. The synchronous motors and excitation systems used by these critical loads have stringent requirements for power supply stability. Voltage sags may cause abnormal motor operation or even motor stalling, resulting in equipment shutdowns and production interruptions.
Project Background
The customer is a metal smelting enterprise operating large-scale equipment such as semi-autogenous mills and ball mills. The synchronous motors and excitation systems used by these critical loads have stringent requirements for power supply stability. Voltage sags may cause abnormal motor operation or even motor stalling, resulting in equipment shutdowns and production interruptions.
In metallurgical production, key equipment such as large motors, furnaces, and rolling systems typically require continuous and stable operation. Even short-duration voltage disturbances can interrupt production and lead to additional equipment recovery time and operational costs. Therefore, reliable power supply for critical loads is essential to maintaining production continuity.
Power Quality Challenges
The project primarily involved the excitation cabinets of synchronous motors used for semi-autogenous mills and ball mills. These large motor loads are sensitive to voltage fluctuations. When a voltage sag occurs, the reduction in motor torque may affect normal operation and, in severe cases, cause the synchronous motor to stall and critical production equipment to shut down.
To minimize the impact of voltage disturbances, the key loads required fast and reliable voltage sag protection.
INPOWER Solution
To address the power quality requirements of the critical equipment, INPOWER installed dynamic voltage sag mitigation systems upstream of the feeder cabinets supplying the protected loads.
The project utilized two units rated at 65 kVA and 100 kVA, respectively, with a compensation duration of 3 seconds. The systems continuously monitor the supply voltage and provide rapid voltage compensation when a voltage sag occurs, reducing its impact on the excitation systems and synchronous motors and helping maintain stable operation of critical production equipment.
Project Benefits
The solution reduces the risk of synchronous motor stalling and equipment shutdown caused by voltage sags, helping maintain stable and continuous metallurgical production while minimizing the operational losses associated with unexpected equipment interruptions.
