News

Recently, the cooperation project between our company and Uganda UETCL 132kV substation has achieved remarkable results, and the power testing equipment procurement contract worth 6.3 million RMB (about 900,000 US dollars) has entered the shipment stage successfully. After a strict three-day video inspection process, the owner was highly satisfied with the professional inspection capability demonstrated by our company, and both parties quickly completed the final signature confirmation and started the shipment process.

Recently, our company sent a professional delegation to Vietnam for a four-day business visit. The main purpose of the visit was to gain an in-depth understanding of the development status of Vietnam's electric power industry and the local customers' demand for our power test equipment.

RD3215EHigh voltage insulation resistance tester is highly praised by customers in Bolivia

An engineer from an Indian transformer company visited our factory to inspect and verify the gas chromatography instrument on behalf of the company.

We are delighted to announce that our company has successfully established a partnership with a customer in Chile, providing them with electrical testing equipment, including the tan delta transformer dielectric loss tester, insulation resistance tester, and transformer oil dielectric strength tester, with a total value of several hundred thousand RMB.

Rui Du Mechanical and electrical (Shanghai) Co., Ltd. is honored to have won the bid for the POWERCHINA Hydropower Bureau International Company Ethiopia DDAHD Electrical Instrument Procurement Project!

​In a remarkable stride towards innovation, we introduce our cutting-edge oil filtration machines designed to redefine efficiency and elevate the standards of oil treatment. The process of transforming electrical insulating oil into a high-performance powerhouse has been greatly streamlined.

Introduction of variable frequency series resonant withstand voltage test; Application of variable frequency series resonance in GIS system; AC dielectric test procedure; Judgement of field withstand voltage test results; Location method of breakdown fault in GIS withstand voltage test.

2023.10.30— The power industry is undergoing a revolutionary transformation to meet the growing demand for electricity while focusing on reducing its environmental impact. Innovative initiatives worldwide are driving the power sector towards a greener and more digital future.

Both DC internal resistance and AC internal resistance measurements have their own unique principles and operations. DC internal resistance is relatively simple to measure and is based primarily on Ohm's law. AC internal resistance, on the other hand, requires the injection and detection of a sine wave signal from which the corresponding impedance value is obtained.

Hydrogen-cooled generator with water-cooled stator, segmented rotor coils, advanced ventilation, and safety features including sealing and cooling systems.

The vacuum oil filter efficiently removes moisture, gas, impurities, and pigments from oil under high vacuum, enhancing its quality by reducing dielectric loss and acidity, and improving demulsification.

The tan delta test on a transformer, also known as the Dielectric Dissipation or Loss Angle test, is a method used to assess the quality and condition of the transformer's insulation system. This test is crucial for determining the health of the transformer and identifying potential insulation faults or aging issues.

Measurement of capacitance and dielectric loss of circuit-breaker capacitor is a very important task to ensure safe and stable running of circuit-breaker. However, due to serious electric interference to on-site measurement, dielectric losses of more and more 500kV circuit-breaker capacitor exceeded the limit at 10kV test voltage according to the CSG trial standard. To address the above-mentioned problems, the paper proposes that methods of using different frequency power source and boosting test voltage be utilized to measure the capacitance and dielectric loss. Based on the above measuring methods, several common test schemes are put forward and application ranges are also analyzed followed by capacitance and dielectric loss measurement for some 500kV circuit-breaker capacitor at substation. Test results indicate that the dielectric loss of capacitor reduces as the voltage rises; the change in test voltage frequency can effectively shield the interference from on-site electric field.

Dubai Middle East Energy 2023