Sphere Gap
LQHSG750 750mm Vertical Sphere Gaps for Extreme High Voltage Applications
Product Overview
The LQHSG750 vertical sphere gap system represents the ultimate in high voltage measurement technology, featuring massive 750mm precision copper spheres for measurements up to 750kV. This IEC 60052-compliant instrument provides direct voltage measurement with ±3% accuracy for high-power laboratories and electrical testing facilities.
Technical Specifications
| Parameter | Specification |
|---|---|
| Sphere Diameter | 750mm (±0.15mm tolerance) |
| Maximum Voltage (1.2/50μs impulse) | 750kV at 375mm spacing (0.5×D) |
| System Height | 4.8m (adjustable) |
| Base Footprint | 3.1m × 1.3m |
| Total Weight | 520kg (net) |
| Gap Adjustment Resolution | ±0.5mm precision scale |
| Measurement Accuracy | ±3% (per IEC 60052) |
| Surface Finish | Mirror polish (Ra ≤ 0.08μm) |
Key Features
Ultra-High Voltage Measurement
750mm electrolytic copper spheres (99.99% purity)
Vertical configuration for space efficiency
Industrial-grade construction for heavy-duty use
Precision ground stainless steel adjustment mechanism
Advanced Measurement Capabilities
750kV rating for standard lightning impulse (1.2/50μs)
Three-phase measurement capability:
Impulse voltages
AC peak voltages
DC voltages
Optional chopping device for waveform termination
Safety & Compliance
Full compliance with IEC 60052 standards
Insulating columns rated for 800kV BIL
Integrated safety discharge system
Designed for controlled laboratory environments
Optional Chopping System
| Component | Specification |
|---|---|
| Trigger Method | Programmable electronic ignition |
| Delay Range | 1-5μs in 8 discrete steps |
| Timing Accuracy | ±0.1ms maximum deviation |
| Power Requirements | 230V AC, 50/60Hz, 500VA |
| Trigger Mechanism | Integrated ignition rod in replacement sphere |
Note: Chopping operation requires replacement of one measurement sphere with the dedicated trigger sphere.
Installation Requirements
Laboratory Space: Minimum 6m × 5m with 5.5m ceiling height
Environmental Conditions: 20°C ±3°C, ≤45% RH recommended
Foundation: Reinforced concrete pad (minimum 400mm thickness)
Safety Clearances: 3.5m minimum from all structures
Power Requirements: Dedicated 230V/32A circuit for chopping system
Typical Applications
Calibration of extra-high voltage measurement systems
Research in ultra-high voltage phenomena
Testing of 800kV+ class power equipment
Impulse generator waveform verification
High voltage component development
Maintenance Protocol
Routine Maintenance
Daily: Visual inspection of sphere surfaces
Weekly: Mechanical function check
Monthly: Full system diagnostic
Periodic Service
6 Months: Precision alignment verification
Annual: Complete system recalibration
3 Years: Full metrological recertification
Cleaning Procedure: Use only approved, static-free wipes with electronic-grade isopropyl alcohol (99.9% purity).
Technical Advantages
Unmatched Accuracy: ±3% measurement accuracy at 750kV
Industrial Durability: Heavy-duty construction for research-grade reliability
Flexible Configuration: Compatible with both vertical and horizontal mounting
Future-Proof Design: Modular architecture for system upgrades
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