The XHHV508-4 DC High Voltage Power Supply System is a next-generation portable cable fault testing solution that integrates a high-frequency DC power supply, external capacitor bank, and precision sphere gap into one ultra-lightweight package. Designed to fully replace traditional heavy test transformers and control boxes, this system is rated for 35kV and below cable fault impulse discharge testing and DC withstand voltage testing. At just 12kg for the main power unit — versus 70kg+ for conventional transformer-based equipment — it represents a revolutionary advance in field-portable high-voltage testing technology.

The complete system consists of three purpose-engineered components, each designed to work seamlessly together while being transportable and serviceable independently.

1. XHHV508-4 — High-Frequency DC High Voltage Power Supply

Core Unit

The heart of the system. A high-frequency switched-mode DC power supply generating 0–32kV continuously adjustable output with 320mA short-circuit current capacity. Features zero-start protection, over-current/over-voltage/over-temperature auto-protection, and a unique self-discharge circuit that automatically drains residual high voltage when output is cut. Dual 1.5-class analog meters provide real-time voltage and current monitoring.

• Output: 0–32 kV DC adjustable | 320 mA short-circuit | 400 W rated power
• Protection: Over-current, over-voltage, 65°C over-temp auto-shutdown
• Dimensions: 400L × 310W × 320H mm | Weight: 12 kg

2. XHCC-8/15 — External High-Voltage Capacitor Bank

Energy Storage

Modular capacitor bank providing configurable capacitance from 1–16μF to match different cable types and fault conditions. Stores the energy required for powerful impulse discharge during burn-through and fault pre-location. The compact enclosure (455L × 360W × 360H mm) integrates seamlessly with the XHHV508-4 power supply and XHJX-35 sphere gap.

• Capacitance Range: 1 / 2 / 4 / 8 / 16 μF, user-selectable
• Dimensions: 455L × 360W × 360H mm
• Operating Temperature: -20°C to +65°C

3. XHJX-35 — Precision Adjustable Sphere Gap

Discharge Control

High-precision adjustable sphere gap rated for 35kV operation. Controls the impulse discharge timing and voltage threshold with repeatable accuracy. The gap spacing is continuously adjustable, allowing the operator to fine-tune the discharge voltage for optimal burn-through results on different cable fault types. Provides visual confirmation of discharge activity during testing.

• Rated Voltage: 35 kV
• Adjustment: Continuously variable gap spacing for precise voltage control
• Integration: Direct interface with XHHV508-4 and XHCC-8/15

• Ultra-Lightweight Design: At 12kg total for the main power supply, this system replaces traditional transformer and control box setups weighing 70kg+ — a weight reduction of over 80%.
• Short-Circuit Immune: Unique design allows the high-voltage output to withstand direct short-circuit to ground without damage, providing unmatched field robustness.
• Uniform Impulse Discharge: High-frequency switching technology delivers consistent, controllable discharge pulses for reproducible burn-through results.
• Humanized Operation: One-touch start/stop with zero-position interlock ensures operator safety while maintaining the familiar transformer-based workflow.
• Automatic Safety Systems: Over-current, over-voltage, over-temperature protection plus automatic self-discharge on power-off — no manual discharge required for the internal circuit.
• Real-Time Capacitor Voltage Display: Voltmeter indicates residual capacitor voltage even when the unit is in standby, eliminating guesswork during safe discharge procedures.

• Cable Fault Impulse Discharge: Primary application — provides controlled high-energy pulses for burn-through and arc reflection fault pre-location on 35kV and below cables.
• DC Withstand Voltage Testing: Secondary application — connects a microammeter in series at the high-voltage terminal for DC withstand (hipot) testing of cables, switchgear, and other electrical equipment.
• Field & Laboratory Use: Compact size and generator compatibility enable deployment at remote substations, construction sites, and in-house testing laboratories.

1. Connect AC 220V power and ensure reliable grounding (ground resistance < 10Ω). 2. Turn on the power switch — the power indicator illuminates. 3. Ensure the voltage adjustment knob is fully counterclockwise (zero position) — the Start button LED will illuminate. 4. Press Start to energize — the Stop button LED illuminates, indicating high voltage is active. 5. Slowly rotate the voltage adjustment knob clockwise while monitoring the kV meter to reach the desired discharge or test voltage. 6. Adjust knob to control discharge interval — clockwise for faster, counterclockwise for slower. 7. After testing: return voltage knob to zero, press Stop, discharge the capacitor using a discharge rod, and apply a ground lead to the HV terminal. 8. Switch off power and stow all test leads.