Variable Frequency Series Resonance Test System for High Voltage Power Cable Testing AC Withstand Voltage Test Equipment for XLPE Cables, Underground Cables and Substation Cable Commissioning

The Variable Frequency Series Resonance Test System for Power Cable Testing is designed for AC withstand voltage testing of high-voltage power cables during installation acceptance, commissioning, maintenance, and specified diagnostic or preventive test programs.

High-voltage cables present a capacitive load. As cable length increases, the total capacitance can increase significantly, affecting the power requirements of conventional high-voltage test equipment.

A variable-frequency series resonant system uses a high-voltage reactor and the capacitance of the cable under test to establish resonance. By adjusting the operating frequency, the system can generate the required AC test voltage while reducing the input power needed to supply the reactive component of the load.

The appropriate configuration depends on cable voltage class, conductor size, insulation type, cable length, total capacitance, test voltage, and the applicable test standard.

• Designed for compatible high-voltage cable withstand testing.

• Variable-frequency resonance adjustment.

• Modular high-voltage reactor configuration.

• Configurable output voltage and rated capacity.

• Suitable for selected underground and substation cable projects.

• Digital voltage and frequency monitoring, depending on configuration.

• Configured protection against overvoltage, overcurrent, and other specified abnormal conditions.

• Portable or modular arrangements available for suitable project requirements.

AC Withstand Testing of XLPE Cables

Supports the specified AC withstand voltage test for compatible XLPE power cables, subject to the applicable standard and cable manufacturer's requirements.

Cable Commissioning Tests

Can be used as part of the acceptance testing process after installation of compatible high-voltage cable systems.

Post-Maintenance Testing

Supports specified AC withstand tests following cable repair or maintenance, where required by the approved test procedure.

Long-Cable Testing

The system can be configured for longer cable sections when the required voltage, total capacitance, frequency range, and system capacity are within its design limits.

Test Parameter Monitoring

A suitable control and measurement system monitors the test conditions and records available voltage, frequency, and duration data.

• Underground power cable installation

• XLPE transmission and distribution cables

• Substation cable systems

• Cable commissioning and acceptance testing

• Power cable maintenance projects

• Utility cable testing departments

• Electrical installation contractors

• Cable manufacturers and testing laboratories

Pain Point 1: Cable capacitance increases with cable length.

Cable length and capacitance should be assessed before system selection. We can evaluate the cable parameters and required test conditions to help determine the suitable reactor combination.

Pain Point 2: The available site power supply is limited.

Series resonance can reduce the required input power compared with a direct high-power test arrangement. The required supply capacity still depends on the selected system and actual load.

Pain Point 3: Different projects involve different cable voltage classes and lengths.

A modular reactor system can provide configuration flexibility, provided the selected combination satisfies the required electrical ratings.

Pain Point 4: The testing team needs to work at multiple sites.

Equipment packaging, component dimensions, transportation, setup requirements, and operating interfaces can be considered when designing a field-testing configuration.

Q1: Can the system test 10 kV, 35 kV, 110 kV, and 220 kV cables?

Suitable configurations may be available for these voltage classes, but the required output voltage and capacity must be evaluated for each application.

Q2: Can the system test long XLPE cables?

Yes, when the cable capacitance, length, required test voltage, operating frequency, and system capacity fall within the specified operating range.

Q3: What cable information is required for equipment selection?

Please provide the nominal voltage, cable type, conductor cross-section, cable length, number of phases or test arrangement, required test voltage, and applicable standard.

Q4: Can the system be used for on-site commissioning?

Suitable configurations can be designed for on-site testing. Site power, grounding, environmental conditions, transportation, and safety arrangements must be reviewed.

Q5: Does the system support automatic resonance searching?

Automatic frequency searching can be included in compatible control configurations. Please confirm this requirement when requesting a quotation.

Q6: Can the system perform DC withstand testing?

The standard series resonant configuration is primarily intended for AC withstand testing. Any additional DC testing function requires a separate review of the proposed equipment and accessories.

Send us your cable voltage class, cable length, cable capacitance if available, required test voltage, and test duration. We can review the parameters and recommend a suitable series resonant test system for your project.