Intelligent Burn-Through Bridge Cable Fault Locator 60kV 750mA Accurate Fault Detection | XHSC-60Q

The XHSC-60Q intelligent burn-through bridge is an advanced cable fault pre-location instrument that integrates burn-through, intelligent diagnosis and digital bridge measurement in one portable unit. The burn-through mode provides a rated 60kV DC output with a maximum arc current of 400mA to quickly convert high-resistance cable faults into low-resistance faults, while the digital bridge mode delivers up to 750mA test current for highly accurate fault distance measurement.

This cable fault locator is particularly suitable for insulation fault pre-location of high-voltage, large-cross-section and long-length complex cable systems, such as cables with GIS terminals and cross-bonding connections. Thanks to the intelligent diagnosis function, the instrument automatically identifies the cable fault type, guides the operator through the correct test sequence, and completes the location without removing the GIS switch or short-circuiting the cross-bonding, dramatically reducing outage time.

This instrument provides cable engineers with a professional, comprehensive solution for insulation fault pre-location, turning complicated field testing into a guided automatic process.

The XHSC-60Q begins every test with an intelligent diagnosis that automatically evaluates the cable condition and selects the most efficient path to locate the fault. The diagnosis result is classified into one of the following categories, and the instrument guides the operator to the correct next step.

For high-resistance and unstable flashover faults, the burn-through mode applies 0 ~ 60kV DC with up to 400mA arc current to carbonize the fault point into a stable low-resistance fault. The operator sets the burn-through voltage, a maximum burn-through time of up to 90 minutes, and the output power. When the smart burn-through function is enabled, the test ends automatically as soon as the fault impedance drops to the level required by the distance measurement mode, saving time and avoiding unnecessary stress on the cable.

The XHSC-60Q provides two distance measurement modes to suit different field conditions. In bridge mode the operator inputs the known cable length; in cross-section mode the operator inputs the cable material and cross-section area, and the fault distance can be measured even when the total cable length is unknown.

In both modes the test current is selectable from 20mA to 750mA. The output voltage is 4000V for currents of 20 ~ 75mA, follows the relationship voltage (V) × current (mA) = 300W for currents of 80 ~ 400mA, and is 400V for currents of 410 ~ 750mA, ensuring a strong signal for accurate measurement in every condition.

The setting menu provides time setting, device information, historical records and function options. Historical test data of both bridge mode and cross-section mode is stored automatically, with a capacity of up to 100 records that can be reviewed, deleted individually or cleared. The function options include the smart burn-through function and the grounding detection function; when grounding detection is enabled, the equipment forcibly checks that the impedance between the protective ground and the working ground is within the safe range, and will not allow voltage boosting otherwise.

The standard delivery includes the intelligent burn-through bridge main unit, the bridge test box, 5 spare fuses (10A, 5 × 20), the FJ1 bridge positioning test lead, the FJ2 low-resistance short-circuit lead, the FJ4 burn-through source output lead, a dedicated grounding cable, a discharge rod grounding cable, the power cord and the discharge rod. Optional FJ1L and FJ4L extended 20m leads are available for long cable sections.

Correct wiring is essential for accurate and safe measurement. The XHSC-60Q supports the operator with an automatic wiring check and protective grounding detection before any high voltage is applied.

Urban distribution networks contain numerous short cable sections between distribution cabinets, manholes and building entrances. These short cables are difficult for wave reflection instruments because reflected pulses overlap. The blind-spot-free bridge method of the XHSC-60Q measures them accurately, and the 750mA test current ensures stable results even with multiple joints along the section.

Municipal infrastructure projects such as metro systems, road tunnels, airports and ports use extensive medium and high-voltage cable networks for power supply. Downtime in these facilities causes major disruption. The XHSC-60Q helps maintenance teams pre-locate insulation faults quickly and accurately, minimizing the impact on public services and allowing precise repair planning.

Renewable energy plants operate long collector circuits connecting turbines or inverter stations to the substation, often buried over rough terrain with many joints. Insulation faults in these circuits are difficult to locate with conventional methods. The intelligent diagnosis and burn-through functions of the XHSC-60Q handle high-resistance and flashover faults efficiently, restoring generation capacity with minimal downtime.

Traditionally, burn-through and bridge measurement required two separate instruments with heavy external cabling and manual mode switching. The XHSC-60Q replaces both with one integrated unit.

If the bridge measurement accuracy is ever in doubt, the supplied bridge test box can verify it quickly. The red and black clips and the ground clip are connected to the test box as marked on the label, and the instrument is grounded reliably. The test box provides two test circuits: the upper circuit verifies the low-sensitivity condition, where the bridge reading should be 33.3%, and the lower circuit verifies the high-sensitivity condition, where the reading should match the value shown on the test box panel. If the readings show no significant deviation, the bridge is operating correctly.

For more information about the XHSC-60Q intelligent burn-through bridge, including detailed specifications, demonstration videos and pricing, please contact our sales team. We are glad to recommend the most suitable cable fault location solution for your cable network.