Industrial AC Dielectric Test System High Voltage Withstand Hipot Tester for Cables, Transformers, Motors and Electrical Components Insulation Testing

The YDJ Power Frequency Withstand Voltage Test Device provides a reliable solution for evaluating the insulation strength of high-voltage electrical equipment and insulating materials. By applying a stable, controlled test voltage, it helps identify insulation weaknesses and verify whether the tested equipment meets the required dielectric withstand level before energization, commissioning, or routine maintenance.

The system consists of two main functional units: a control unit and a high-voltage generating unit. The control unit can be configured as a control cabinet or operating console, while the high-voltage side is equipped with a dedicated test transformer for voltage step-up. With multiple combinations of control and transformer units available, the YDJ series can be configured according to different test voltages, output capacities, equipment types, and on-site testing requirements.

• Modular ConfigurationThe control system and high-voltage transformer can be selected and matched independently, making it easier to build a test setup around specific voltage, capacity, and testing requirements.
• Space-Saving ConstructionA practical and streamlined design reduces installation and transportation difficulties while making efficient use of the available working space.
• Dual AC/DC Testing CapabilitySupports both AC and DC withstand voltage tests, allowing one test system to cover a broader range of insulation testing applications.
• Cascade Connection for Higher Test VoltagesIndividual transformer units can be used for standard test levels, while multiple units can be connected in series when higher output voltages are required.
• Multiple Control OptionsDepending on the configuration, the system can be operated through manual, electric, automatic, or industrial computer-based control, providing flexibility for different testing environments.
• Digital Test Result HandlingOptional printer, USB, and computer communication functions facilitate test-data recording, result storage, data transfer, and subsequent analysis.
• Various High-Voltage Transformer ConfigurationsDifferent insulation structures are available, including oil-immersed, epoxy resin dry-type, SF₆ gas-insulated, and corona-free designs to accommodate different voltage levels and operating conditions.
• Designed for Diverse Testing EnvironmentsThe flexible system configuration makes the YDJ series suitable for power utilities, substations, electrical equipment manufacturers, test laboratories, and on-site maintenance applications.

• Substation & Grid CommissioningApplied during installation, commissioning, acceptance, and handover to confirm the insulation performance of electrical equipment in substations, distribution systems, and utility networks.
• High-Voltage Insulation AssessmentUsed to evaluate the dielectric withstand performance of transformers, switchgear, CTs/PTs, power cables, surge arresters, bushings, and other high-voltage components.
• Factory & Production TestingSupports routine production tests, quality inspection, and type testing of high-voltage electrical equipment, insulation components, and finished products.
• Maintenance & Preventive InspectionHelps maintenance teams perform scheduled insulation checks on equipment operating in power plants, railway systems, mining operations, metallurgical facilities, and other industrial environments.
• Laboratory Testing & R&DProvides a controlled high-voltage test platform for universities, testing laboratories, research centers, and engineering organizations carrying out insulation experiments, product development, and electrical performance studies.

• 1. What does an AC Power Frequency Withstand Voltage Test Set do?
  An AC Power Frequency Withstand Voltage Test Set applies a controlled AC test voltage at power frequency to assess the dielectric strength of electrical equipment and insulation systems. It helps determine whether the tested equipment can withstand the specified electrical stress without insulation breakdown. The complete setup generally consists of a voltage control unit and a high-voltage test transformer, making it suitable for factory testing, commissioning, acceptance inspection, and maintenance work.
• 2. What types of electrical equipment can be tested?
  The YDJ series can be used for withstand voltage and insulation testing of a wide range of high-voltage equipment, including power transformers, CTs, VTs, bushings, insulators, switchgear, circuit breakers, power cables, and other electrical components. It can be configured for applications in substations, power utilities, manufacturing facilities, laboratories, research centers, and field testing projects.
• 3. What test transformer configurations are available?
  The test transformer can be selected according to the required test voltage, output capacity, insulation structure, and operating environment. Available configurations may include lightweight, dry-type, oil-immersed, SF₆ gas-insulated, insulating-cylinder, and corona-free designs. This allows the test system to be tailored to specific equipment and testing conditions.
• 4. What types of control systems can be used with the test set?
  Different control configurations are available to match different testing procedures and automation requirements. Options include pointer-type control boxes, digital control units, manual operating consoles, electrically operated systems, intelligent automatic controls, and industrial PC-based control systems. The selected control unit can be matched with the appropriate test transformer to create a complete AC/DC high-voltage testing system.
• 5. Can the YDJ test system be customized for different testing environments?
  Yes. The system can be configured for fixed laboratories, manufacturing plants, commissioning sites, and field maintenance applications. For mobile testing, lightweight and compact components can simplify transportation, installation, and on-site operation. For laboratories and production facilities, higher-capacity configurations can be designed for demanding high-voltage testing requirements.