Rui Du Mechanical and electrical (Shanghai) Co., Ltd. is a professional manufacturer and system solution provider for the global supply of power testing equipment. Rui Du Mechanical and electrical (Shanghai) Co., Ltd. was established in 2014, which focuses on the independent design, development and production of high-voltage power test equipment. The products cover substation transformer, high voltage switch, mutual inductor, lightning arrester, storage battery, cable fault, relay protection, insulation withstand voltage, insulation grounding and oiling equipment, SF6 equipment testing, power generator testing, water cooling equipment testing, instrumentation, spare parts, power quality management. All products of the company have passed international IS09001 quality certification, IEC certification and CE certification.
Learn what BDV (Breakdown Voltage) means, why it matters in transformer oil testing, and how to measure it accurately. Explore BDV test procedures, acceptable values, and the Wrindu RDJJD-100kV oil dielectric strength tester for precise and reliable insulation diagnostics.
3103-2026
Explore the complete guide to On-Load Tap Changer (OLTC) working principles, types, design, maintenance & diagnostics. Learn how Wrindu OLTC testers ensure transformer reliability & grid stability.
2303-2026
Learn overcurrent causes, impacts & prevention. Wrindu testing equipment features built-in overcurrent protection for safe, reliable industrial electrical testing.
1203-2026
