YDJ Power Frequency Withstand Voltage Test Set is a flexible high-voltage hipot testing solution for verifying the insulation strength of electrical equipment and materials. It combines an SXTC control console with a YD series high-voltage test transformer and supports both AC and DC withstand voltage testing.​
With a compact, modular design and reliable protection functions, the system is suitable for factory testing, laboratory evaluation, commissioning, and field maintenance of transformers, switchgear, cables, and other high-voltage equipment.

• Multiple Configurations — Wide model range with flexible combinations for different voltage and testing requirements.​
• Stable Performance — Proven design delivers dependable operation and consistent test results.​
• AC/DC Hipot Testing — One system supports both AC and DC withstand voltage tests.​
• High-Voltage Expansion — Operates as a standalone unit or connects in series for higher voltage output.​
• Automatic Test Control — Auto models support voltage boosting, timing, data logging, and report generation.​
• Enhanced Safety — Integrated over-current, over-voltage, zero-position interlock, and emergency stop protection.​

• Power Plants – Insulation and withstand testing of transformers, switchgear and HV equipment.
• Substations – Field testing of CT/PT, cables, bushings, arresters and other components.
• Railway Systems – HV insulation testing for traction power equipment and cables.
• Mining & Industrial Sites – Routine and preventive testing of high-voltage electrical systems.
• Electrical Manufacturers – Factory testing and quality control of HV components before delivery.
• Testing Laboratories – Flexible testing solution for various electrical equipment and customer projects.
• Commissioning & Maintenance – On-site acceptance, maintenance and insulation verification.

1. What is a power frequency withstand voltage test set?

   A power frequency withstand voltage test set is a high-voltage testing system designed to assess whether the insulation of electrical equipment and insulating materials can safely withstand specified AC voltage levels.​
   The YDJ series combines a control box or operating console with a high-voltage test transformer, forming a flexible solution for routine AC withstand voltage testing. Depending on the selected configuration, the system can also support AC/DC high-voltage tests for a wide range of applications, including transformers, switchgear, cables, insulators, and other high-voltage components.

2. Can the operating console be customized?

   Yes. The SXTC series operating box/control console can be configured according to the customer's operating requirements.​
   Available options can include:​
   • Pointer display​
   • Digital display​
   • Electric operating console​
   • Intelligent control console​
   • Computer-based control​
   • Automatic voltage regulation​
   • Automatic timing​
   • Printing function​
   • USB interface​
   • Customized control functions​
   The appropriate configuration can be selected according to the required level of automation.