Special power distribution system solution for sewage treatment plant

Detailed plan description

For municipal sewage treatment plants and industrial wastewater treatment stations, we provide power distribution and control system solutions covering the entire process section of water inlet, aeration, sludge treatment, and water effluent. It focuses on adapting to heavy-duty equipment such as blowers, water pumps, and dehydrators, and is equipped with frequency conversion speed regulation and intelligent control. At the same time, special protection is provided against the corrosive environment of sewage plants to ensure long-term stable operation of the system.

Adapted to Indonesia

Solve the problems of "high power consumption of water pumps/blower, damage to cabinets by corrosive environment, inability to stop continuous operation, and slow fault location" for water companies and sewage plants. The solution covers MCC, VFD, soft start, PLC/SCADA, corrosion protection, energy consumption monitoring and critical equipment bypass.

Professional specifications and standards based

Most water pumps and blowers are 400V three-phase motors. It is recommended to use VFD control and configure a bypass circuit; the cabinet material can be selected from 304/316 stainless steel, epoxy powder coating or FRP, and IP55/IP65 for outdoor/humid areas. Refer to IEC 61439, IEC 61800, IEC 60034, IEC 60529, ISO 12944 corrosion protection levels.

Product specification comparison table

Original experience and test data

Scarce experience: Corrosion of cabinets and oxidation of terminals in wastewater plants can cause hidden downtime.

Pitfalls and pain points that I have stepped on

• Heavy-duty equipment such as blowers and water pumps have large starting currents and frequent tripping, which affects the treatment process;
• The corrosive gas and water vapor in the sewage plant are heavy, and the electrical equipment corrodes quickly and has a short life;
• The equipment operates at power frequency for a long time and consumes high energy, and the electricity bill accounts for a large proportion of the operating cost;
• There are many process sections, scattered power distribution, and a heavy workload for operation and maintenance inspections.

Core parameters

The voltage level is 10kV/0.4kV, the applicable motor power is 0.75kW~500kW, the variable frequency speed regulation range is 0~50Hz, the power factor is ≥0.95, and the equipment anti-corrosion level is WF2.

Our special contribution

• Frequency conversion soft start control, smooth start without impact, and realize process flow adjustment at the same time;
• Electrical equipment undergoes heavy anti-corrosion treatment to adapt to corrosive and humid environments, and its service life is doubled;
• Full frequency conversion speed regulation + energy consumption optimization, automatic adjustment according to water quality and quantity, power saving rate up to 20%~30%;
• The whole plant's power distribution centralized monitoring system enables remote operation and maintenance, reducing the workload of on-site inspections.

Project income

• Economic benefits: Frequency conversion speed regulation + energy consumption optimization saves 20% to 30% of electricity in the entire plant. The annual electricity bill of the 10,000-ton sewage plant saves more than one million yuan; the equipment life is doubled, and the replacement cost of electrical equipment is reduced by 50% on average every year.
• Process benefits: Smooth start without tripping, stable process operation, improved effluent water quality compliance rate; frequency conversion adjustment adapts to water volume fluctuations, and stronger process adaptability.
• Management benefits: Centralized monitoring of power distribution throughout the plant, remote operation and maintenance, on-site inspection workload reduced by 60%, and operation and maintenance labor costs reduced.