Recently, Alstom Sifang (Sifang Locomotive) completed on-site installation, commissioning and acceptance of the DJF-50KVA/100kV partial discharge & AC hipot test system. This DEMIKS high voltage PD and withstand voltage test equipment is deployed in the EMU manufacturing workshop, dedicated to partial discharge testing and power frequency withstand voltage tests for high-speed train high-voltage cables, traction transformers and HV electrical connectors. It provides professional high voltage power testing solutions for type tests and routine factory inspection of rail vehicle high voltage components.
Alstom Sifang is a leading manufacturer of rail transit rolling stock in China, specializing in the R&D and manufacturing of Fuxing high-speed EMUs and urban metro vehicles. As core components of the train traction power supply system, EMU high voltage cables operate under continuous impulse voltage and complex electromagnetic interference. Voids and delamination inside cable insulation will trigger partial discharge. Long-term partial discharge activity degrades insulation and may lead to breakdown, threatening the safety of high-speed trains. Therefore, partial discharge testing and AC hipot test are mandatory reliability verification procedures for rail transit HV cables and traction components.
The delivered DJF-50KVA/100kV partial discharge & AC hipot test system is an integrated partial discharge-free power frequency test unit. It integrates a partial discharge-free test transformer, high-precision PD acquisition module and intelligent control console. It supports simultaneous partial discharge measurement and AC withstand voltage testing, real-time PRPD pattern capture, automatic logging of test voltage, PD signals and duration, and auto-generated test reports. Excellent anti-interference performance enables stable operation in the harsh electromagnetic environment inside locomotive workshops, complying with rail industry standards for EMU HV cables and on-board high voltage assemblies.
With this DEMIKS partial discharge-free AC hipot test system, Alstom Sifang established full insulation verification capability for EMU high voltage cables and on-board HV components. Hidden insulation defects can be detected at the manufacturing stage to prevent traction power failures caused by insulation degradation during long-term operation, ensuring reliability of Fuxing high-speed trains and meeting strict HV test specifications for global rail transit projects.
DEMIKS Power Technology specializes in R&D and manufacturing of high voltage power test equipment. Our product portfolio includes integrated PD & hipot test systems, partial discharge shielding rooms, variable frequency series resonance sets and lightning impulse generators, widely used in power grid, new energy and rail transit equipment manufacturing. This cooperation with Alstom Sifang validates the performance of DJF series partial discharge-free AC hipot test equipment in high-end rail vehicle QC labs, delivering reliable high voltage partial discharge and withstand voltage testing solutions for rolling stock manufacturers.
- Why perform partial discharge and AC hipot tests on high-speed train HV cables?
EMU high voltage cables endure continuous high voltage, vibration and temperature fluctuation. Voids or delamination inside insulation cause partial discharge. Persistent PD degrades insulation and may trigger traction power failure. Partial discharge-free hipot test equipment detects PD signals and insulation strength before delivery to ensure operational safety.
- What are the advantages of DJF-50KVA/100kV partial discharge-free AC hipot test system?
The DJF-50KVA/100kV system integrates PD-free transformer and intelligent control unit, supporting synchronous AC withstand voltage and partial discharge testing. Strong anti-interference performance works well in locomotive factory environments. The touchscreen console displays real-time PD patterns and archives test data automatically, meeting type test and factory inspection requirements for rail transit HV components.
- What high voltage power testing is required for rail transit equipment?
Testing for on-board HV cables and traction components mainly includes AC power frequency withstand voltage test and partial discharge test. It verifies insulation strength and quantifies PD magnitude to identify internal insulation defects, complying with EMU industry standards and mandatory reliability tests before vehicle delivery.
