JNTech Project Boosts Water Supply in Karst Areas
Release time: 2025-12-19
Recently, a high-head variable-frequency water supply project in Southwest China, constructed by our company, was officially put into operation. Designed to address the complex karst topography and significant elevation differences of the region, the project achieves exceptional performance with a rated head of 335m and a flow rate of 85m³/h, solving the long-standing problem of “water flowing in deep valleys while people suffer from thirst on the high mountains.”
The core drive system of this project utilizes an XDYSP-315M-2 dedicated variable-frequency speed-regulating three-phase asynchronous motor, compliant with the JB/T 7118-2014 standard.
Compared to general-purpose motors, this standard imposes higher requirements on electromagnetic compatibility, harmonic suppression, and shaft current protection. To address the high-frequency harmonic losses caused by the PWM output of the VFD, the XDYSP-315M22 motor optimizes the electromagnetic slot design, utilizes low-loss silicon steel sheets, and employs enhanced winding processes, increasing efficiency to 93.5%. Under long-term heavy-duty operation at a 335 m head, higher efficiency means less heat generation, reducing the cooling burden on the IC416 system and significantly extending the lifespan of the bearings and lubrication system.
In terms of shaft current control, the motor adopts a symmetrical electromagnetic design and reinforced insulation structure, effectively withstanding high dv/dt voltage surges, preventing bearing electrocorrosion risks, and ensuring long-term stable operation.
At a high head of 335 meters, the system operates with an outlet pressure exceeding 33 atmospheres, which can only be achieved using multi-stage centrifugal pumps. The pump unit operates at a high speed of 2950 r/min, making axial force balance and the erosion resistance of sealing and balancing components critical. Any design deficiencies will quickly amplify the risks during long-term operation.
Meanwhile, the cavitation risk associated with high altitude cannot be ignored. The system’s NPSHr is 4.0 m. In southwestern China, where atmospheric pressure decreases with increasing altitude, the installation height must be strictly controlled to ensure sufficient net positive suction head (NPSH). Otherwise, cavitation bubble collapse will rapidly damage the materials, directly affecting the lifespan of the 132 kW unit.
Comprehensive Benefit Evaluation and Life Cycle Cost (LCC) Analysis
Economic Benefit Forecast Table
| Cost dimension | Traditional power frequency scheme | Variable frequency speed control scheme | Evaluate |
|---|---|---|---|
| Energy consumption costs | High (frequent water diversion) | Optimization (supply on demand) | The annual electricity savings are approximately 150,000 to 250,000 kwh. |
| Maintenance frequency | High (large mechanical shock) | Low (running smoothly) | Seal lifespan is extended by 50%. |
| System stability | Medium (moderately susceptible to power grid fluctuations) | High (with low voltage ride-through capability) | Suitable for remote power grids in Southwest China. |
| Pipeline network lifespan | Threatened by water hammer | Running smoothly | Reduce the risk of pipeline ruptures. |
This project delivers efficient pump–motor synergy through precise parameter matching.
The rated torque of 420.2 N·m, combined with a moderate current of 238.3 A, significantly reduces the reactive power compensation pressure on the power distribution system. Adherence to the JB/T7118-2014 standard not only guarantees the reliability of individual equipment but also ensures the electromagnetic compatibility (EMC) of the entire control loop in a variable frequency environment, preventing high-frequency interference from affecting the PLC or sensor signals within the pumping station.
The successful delivery of this project not only demonstrates our company’s system integration capabilities under high-pressure working conditions. Through variable frequency speed control, the system’s overall energy saving rate is expected to reach 20%-40%, contributing our professional expertise to the construction of green and efficient water conservancy infrastructure.
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