Product DescriptionLow Voltage Specialist
The XHHV515-8L is a tie-rod portable integrated high-voltage pulse generator designed specifically for low-voltage cable fault testing and DC withstand analysis at voltages up to 15kV. Delivering 900J discharge energy through an 8μF energy storage capacitor, it is optimized for the low-voltage distribution cable segment where 35kV-rated generators are oversized and impractical.
Integrating an energy storage capacitor, DC high-voltage source, and discharge ball gap into a single tie-rod form factor, the XHHV515-8L features a built-in 0–100 second adjustable time relay for precisely controlled impulse discharge intervals. Separate EMP (impulse) and DC (withstand) output terminals eliminate the need to reconfigure connections when switching between fault location and withstand voltage testing modes. A manual ball-gap discharge button allows operator-triggered impulses. Comprehensive automatic protection covers over-current (8mA/3s), over-voltage, and over-temperature (65°C).
Performance Highlights
15kVMax Output Voltage
900JDischarge Energy
8μFCapacitor
0-100sTimed Interval
400WImpact Power
Key Features
- Tie-rod portable integrated design—compact, lightweight, easy to carry between field sites
- Built-in 0–100s adjustable time relay for precisely controlled automatic impulse discharge intervals
- Separate EMP and DC output terminals—no cable reconfiguration when switching between fault location and withstand testing
- Manual ball-gap discharge button for operator-triggered single impulses
- High-voltage pulse output is uniform and controllable across full voltage range
- High-voltage side metering for real-time, accurate voltage and current indication
- Zero-start protection: start button only effective when voltage knob is at zero position
- Over-current protection: 8mA threshold with 3-second delay, auto-pop switch
- Over-temperature protection: automatic cutoff at 65°C
- Auto-discharge: internal capacitor and cable residual voltage safely discharged on stop
Front Panel Layout
| Control / Port | Function |
|---|
| Safety Ground | Instrument chassis ground; must be reliably connected to earth |
| High-Voltage Ground | HV tail grounding; prevents leakage, essential for proper boosting |
| Sampling Ground | Pulse capacitor negative terminal for flashover waveform sampling |
| Discharge Button | Manual ball-gap contact discharge (max 1s per press) |
| HV Start Button | Light on = zero position, button valid; button invalid if light off |
| HV Stop Button | Cuts HV output immediately; triggers auto-discharge; HV light goes out |
| Over-Current Protection | Press to arm; pops up when 8mA >3s is detected |
| Voltage Adjustment | CCW to zero first, then press Start, rotate CW to boost |
| Power Switch | I = AC220V on; 0 = system power off |
| Fuse Holder | AC220V power supply system fuse |
| Power Socket | AC220V working power input port |
| Time Setting | Adjustable discharge interval: 0–100 seconds |
| Ammeter | High-voltage side current indication |
| Voltmeter | High-voltage output kV indication |
| HV Output — EMP | Connect HV output line for impulse discharge mode |
| HV Output — DC | Connect HV output line for DC withstand voltage mode |
Technical Parameters
| Impact High Voltage | 0–15kV |
|---|
| High Voltage Accuracy | 2.5 level |
|---|
| Built-in Capacitor | 8μF |
|---|
| Discharge Energy | 0–900J |
|---|
| Output Voltage Polarity | Negative polarity |
|---|
| Impact Power | 400W |
|---|
| Operating Mode | Adjustable-rate impulse / Single shot / DC withstand |
|---|
| Min DC Output Current | 16mA at 15kV |
|---|
| Discharge Interval | 0–100s adjustable (built-in time relay) |
|---|
| Over-Temperature Protection | 65°C |
|---|
| Over-Current Protection | 8mA (trigger >3 seconds) |
|---|
| Included Cables | HV output 2m / Ground 3m / Power 1.8m |
|---|
| Power Supply | AC220V±15%, 50Hz±2Hz (60Hz) |
|---|
| Ambient Temperature | -20 – +60°C |
|---|
Target Applications
The XHHV515-8L is purpose-built for low-voltage distribution network maintenance crews, street lighting and municipal cable service providers, building electrical contractors, and LV cable commissioning engineers—professionals whose daily work centers on cables rated below 15kV. In these applications, 35kV-rated generators introduce unnecessary bulk, weight, and cost. The XHHV515-8L fills this gap with a right-sized alternative: 900J is sufficient for LV fault flashover location, and the 8μF capacitor provides ample energy density for the lower voltage range. The tie-rod design enables easy transport in service vehicles, and the 0–100s timer allows hands-free cyclic discharge during extended fault search operations. For medium-voltage applications (35kV), see the XHHV535 series.
▎Frequently Asked Questions
Q: How does a high voltage surge generator work in cable fault detection?
The surge generator discharges a high-energy pulse into the faulty cable, creating a controlled high-voltage arc at the fault point. This arc produces both an acoustic signal (loud thumping sound detectable by ground microphones) and an electromagnetic pulse (detectable by an inductive receiver). By combining acoustic and electromagnetic signal arrival times, operators can pinpoint the exact fault location with precision—a technique known as acoustic-magnetic synchronization.
Q: Which voltage range should I select for different cable types?
Voltage selection follows the cable's rated operating voltage as a general guideline. For low-voltage cables (up to 1kV), use the 8kV or 12kV range. For medium-voltage distribution cables (6-15kV), the 16kV range is appropriate. For high-voltage transmission cables (35kV and above), use the 32kV range. Always consult the cable manufacturer's maximum test voltage specifications and ensure all safety clearances are maintained during high-voltage operation.
Q: What safety precautions must be observed during surge generator operation?
High voltage surge generator testing requires strict safety protocols. Always verify the cable is fully de-energized and isolated from all power sources before connection. Establish a minimum 5-meter safety perimeter around the test zone with warning signs. All personnel must wear appropriate PPE including arc-rated clothing, HV insulating gloves, and dielectric overshoes. The integrated safety features—automatic discharge upon power-off, emergency stop, and zero-voltage interlock—provide additional layers of protection but should never replace proper safety procedures.
Q: What is the advantage of multiple energy levels (Joules) on this unit?
Different energy levels serve different diagnostic purposes. Low energy settings (e.g., 864J–1024J) are ideal for initial fault confirmation and locating high-resistance faults where excessive energy could worsen cable damage. Medium energy (1225J–2048J) provides optimal acoustic signal strength for most routine fault pinpointing. High energy (2450J+) is reserved for very long cables, deep burial scenarios, or high-impedance faults that require stronger arc generation to produce a detectable acoustic signature. The three-level selection allows operators to match energy output to field conditions.
Q: What warranty and support is included with this surge generator?
12-month standard warranty against manufacturing defects with lifetime technical support. CE and ISO 9001:2015 certified. Each unit includes the surge generator, HV output cable, ground cable, discharge rod, user manual, and a rugged transport case. On-site installation, commissioning, and operator safety training are available upon request. Spare parts including discharge gaps, capacitors, and HV diodes are stocked for rapid replacement.
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