LQHSW Steep Wave Voltage Divider: Fast-Response High-Voltage Testing

The LQHSW Steep Wave Voltage Divider is designed for high-accuracy measurements in steep-front impulse voltage tests, with a rapid response time of <5ns and adjustable overshoot. This article covers its technical specifications, applications, and key testing methodologies.

LQHSW-600 Key Parameters

• Nominal Voltage: ±600kV

• Steepness Range: 1000–3000 kV/µs (adjustable overshoot)

• High-Voltage Arm Resistance: 2000Ω

• Low-Voltage Arm Resistance: 50Ω

• Matching Resistors: 70Ω and 750Ω

• Voltage Ratio: 1000:1

• Response Time: <5ns

• Step Response Stability Time (T_a): ≤100ns

• Scaling Factor Uncertainty (K_g): <1.0%

• Partial Step Overshoot (β): ≤20%

Structural Design

The LQHSW-600 features a single-stage design with a low-voltage arm resistor and a removable grading ring for enhanced safety and flexibility during high-voltage tests.

Applications in Steep-Front Impulse Testing

This divider is critical for:

• Insulator Testing: Detects faults in porcelain, composite, and glass insulators.

• Waveform Validation: Measures steepness requirements per IEC/ANSI/IEEE (e.g., 1000kV/µs to 4000kV/µs).

• Fault Detection: Identifies conductive channels, air bubbles, and semi-conductive defects in insulators.

Q1: When to Use the Steep Wave Divider vs. Standard Impulse Divider?

Answer: For steep-front impulse tests (e.g., insulator testing), the LQHSW steep divider must replace the standard impulse divider and connect in parallel with the test object. However, the standard divider remains necessary for conventional lightning (1.2/50µs) or switching (250/2500µs) impulse tests.

Q2: How to Achieve Required Steepness in Insulator Testing?

Answer: Steepness depends on:

• Test Voltage: Higher voltage increases steepness (e.g., porcelain insulators require ≥2500kV/µs).

• Front Time: Shorter front time raises steepness but is limited by the generator’s efficiency.

Finite element analysis confirms steep-front impulses (1000–4000kV/µs) effectively reveal internal faults like conductive channels or air bubbles.

Conclusion

The LQHSW-600 Steep Wave Voltage Divider ensures precision in high-speed impulse tests, meeting stringent industry standards for fault detection and waveform analysis. Its ultra-fast response and adjustable parameters make it ideal for advanced high-voltage applications.