Manager Li Travels to Hangzhou to Complete Installation and Commissioning of the HMYDQW-30kVA/150kV Partial Discharge-Free Power Frequency Withstand Voltage Test Set
Recently, Goldhome's Senior Project Manager Li traveled to Hangzhou, where he successfully completed the installation, commissioning, and handover training for the HMYDQW-30kVA/150kV partial discharge-free power frequency withstand voltage test set at the customer's testing site. With a rated capacity of 30kVA and a maximum output voltage of 150kV, this equipment features an advanced partial discharge-free design and is particularly suitable for power frequency withstand voltage testing and partial discharge measurement of medium- and high-voltage electrical equipment such as transformers, surge arresters, bushings, and switchgear. The client highly praised the equipment's partial discharge control capabilities, voltage stability, and Manager Li's professional service.
Located in the Hangzhou Economic and Technological Development Zone, the client is a high-tech enterprise specializing in the R&D and manufacturing of smart grid equipment. They urgently required a low-partial-discharge, high-precision power frequency withstand voltage test system for new product development and factory acceptance testing. Upon delivery of the HMYDQW-30kVA/150kV unit, Manager Li immediately arrived on-site to conduct a joint inspection of the laboratory environment with the client's Equipment and Quality Departments, verifying power supply capacity, grounding systems, and spatial layout. Given the equipment's extremely stringent partial discharge requirements (≤1 pC), any external interference could potentially affect test results. Manager Li guided the client in reconfiguring the laboratory's grounding busbar, optimized the installation location of the power supply filter, and identified and isolated surrounding sources of electromagnetic interference.
During installation, Manager Li meticulously inspected the wiring and sealing of the PD-free test transformer, voltage regulator, coupling capacitor divider, protective resistor, and PD measurement system, ensuring all high-voltage connection points were smooth and free of burrs. After a day and a half of careful work, all hardware was installed and ready for commissioning.
During the commissioning phase, Manager Li first conducted a no-load voltage ramp-up test. The equipment rose smoothly from 0 kV to 150 kV, with a sinusoidal voltage waveform throughout the entire process. The voltage regulator operated continuously and steplessly, with no abnormal noises or discharge sounds. Subsequently, Manager Li used a calibrator to verify the PD measurement system and connected a standard capacitive load to perform partial discharge testing. At 100% of the rated voltage, both background noise and the equipment's intrinsic partial discharge levels were consistently maintained below 0.5 pC, far exceeding the 1 pC requirement specified in IEC 60270 and the customer's specifications.
Next, Manager Li connected the customer's actual test specimen-a 35kV voltage transformer-and performed power frequency withstand voltage and partial discharge measurements in accordance with the IEC 61869-3 standard. At a test voltage of 80kV, the transformer's partial discharge level was only 0.8 pC; after passing the withstand test, the equipment automatically reduced the voltage and recorded the data. The head of the client's quality department observed the entire process and remarked on the spot: "We have previously used several domestic devices, but it was difficult to achieve a partial discharge background below 1 pC. This Goldhome HMYDQW-30kVA/150kV unit is truly impressive. The waveforms and readings after Manager Li's calibration are very clean and fully meet our testing requirements for high-end transformers."
After completing the commissioning and acceptance tests, Manager Li organized comprehensive training for the client's operations and maintenance staff. The training covered: the principles of partial discharge-free testing, equipment safety operating procedures, the coordinated use of voltage regulators and transformers, calibration and reading of the PD measurement system, precautions regarding protective resistors and rapid discharge, as well as daily maintenance and troubleshooting of common faults. The training employed a combination of theoretical instruction, hands-on exercises, and performance evaluations. Under Manager Li's guidance, two of the client's technicians independently completed the entire process-from connecting the test specimen and configuring parameters to applying the withstand voltage and saving data-and both successfully passed the assessment.
The HMYDQW series of PD-free power frequency withstand voltage test units is a product meticulously developed by Goldhome for medium- and high-voltage electrical equipment testing. Covering a wide range of specifications from 5kVA to 300kVA and 50kV to 500kV, these units feature oil-immersed or gas-insulated structures and are equipped with an intelligent PD measurement system. They are widely used for routine testing, type testing, and research testing of products such as current transformers, surge arresters, switchgear, and transformers. Manager Li's visit to Hangzhou once again demonstrated Goldhome's philosophy of "customer first, technology-driven, and service-oriented."
