AC Dielectric Test System Power Frequency AC Hipot Test Equipment for Laboratory & Onsite Field Dielectric Strength Testing of HV Electrical Components

YDJ Power Frequency Withstand Voltage Test Set is a high-voltage electrical testing system designed for insulation withstand testing of transformers, cables, switchgear, electrical components, and insulating materials. The system combines the SXTC control console with a YD series high-voltage test transformer, providing a flexible and reliable solution for both AC and DC high-voltage testing.

It is suitable for power frequency AC withstand voltage tests and DC withstand voltage tests in laboratories, substations, power plants, manufacturing facilities, and field maintenance applications. The YDJ test set is widely used by power utilities, electrical equipment manufacturers, railway systems, mining and metallurgical industries, and power maintenance organizations.

• Comprehensive Model Range — Multiple voltage and capacity options are available to match different testing requirements, with flexible configurations and customized solutions upon request.
• Proven & Reliable Design — Built with a mature structural design and dependable components to ensure stable operation, long service life, and enhanced testing reliability.
• AC/DC Dual-Mode Testing — Supports both AC and DC withstand voltage testing in one system, providing greater versatility while maintaining a compact, portable design.
• Expandable Voltage Configuration — Individual units can be used independently or connected in cascade to achieve higher output voltages for demanding high-voltage applications.
• Intelligent Automatic Operation — Automatic models provide functions such as voltage ramp-up, preset timing, test data recording, and report printing, reducing manual intervention and improving testing efficiency.
• Comprehensive Safety Protection — Equipped with multiple protection mechanisms, including over-current, over-voltage, zero-position interlock, and emergency stop, helping safeguard operators and the equipment during testing.

• Power Plants & Power Generation Facilities
  Used for insulation withstand testing of generators, power transformers, switchgear, busbars, cables and other high-voltage equipment during installation, maintenance and periodic inspection.
• Substations & Grid Infrastructure
  Ideal for AC/DC hipot testing of power transformers, CT/PT, circuit breakers, lightning arresters, bushings, insulators and power cables to verify insulation integrity before energization.
• Railway & Rail Transit Power Systems
  Supports high-voltage insulation testing of traction substations, transformers, switchgear, cables and other electrical equipment used in railway electrification and power supply systems.
• Mining & Heavy Industrial Facilities
  Suitable for testing high-voltage motors, transformers, cables, switchgear and electrical components operating in demanding environments, helping identify insulation weaknesses before equipment failure occurs.
• Electrical Equipment Manufacturers
  Used for routine factory testing, quality inspection and final acceptance testing of switchgear, transformers, CT/PTs, arresters, bushings, insulators and other high-voltage products before delivery.
• Power Equipment Installation & Maintenance Contractors
  Provides a practical solution for on-site commissioning, preventive maintenance and after-repair insulation testing of various high-voltage electrical assets.
• Third-Party Testing & Inspection Laboratories
  Suitable for professional dielectric withstand testing and insulation verification across a wide range of electrical equipment, supporting standardized testing, quality assessment and test documentation.
• High-Voltage Component Testing
  Designed for hipot testing of switchgear, power transformers, CT/PTs, lightning arresters, power cables, insulators, bushings and other high-voltage components to confirm their dielectric strength and insulation performance.

1. Can the YDJ series perform AC withstand voltage tests?

   Yes. The YDJ series is designed for power frequency withstand voltage testing.
   Different configurations are available according to the required voltage level, capacity, insulation structure, and application.
   For AC testing, the test transformer raises the input voltage to the required high-voltage test level, while the control system regulates and monitors the test process.

2. Can this equipment perform AC/DC withstand voltage testing?

   Yes, depending on the selected configuration.
   The product series can be configured for AC testing or AC/DC testing. The specific AC/DC capability depends on the selected test transformer, rectifier components, control system, and required voltage level.
   If DC withstand testing is required, please specify the required DC output voltage and test current when requesting a quotation.