European-Style Substation for Changfeng 240kt Frozen Food Base
Background East China’s largest frozen food hub faced triple challenges: 1.Extreme Corrosion: 4x daily acid/alkali wash(humidity>95% + pH 2-12, beyond IEC 60721-3-5 CLASS 5M3) Traditional substations rusted in 5 years(2023 repair cost ¥2.8M) 2.Power Pollution: ±35% voltage sagsfrom freezer start-stop (6x/min), causing ↑45% servo motor damage THDi>25%harmonics triggered 22 PLC malfunctions/year 3.Energy