LQHV-H100B Contact Resistance Tester | 50A/100A Micro Ohmmeter for HV Switches

The LQHV-H100B Contact Resistance Tester is a specialized instrument designed for high-voltage switch maintenance and circuit resistance testing in power supply systems. Featuring fixed 50A and 100A DC outputs, it overcomes the limitations of traditional mA-level testers, ensuring accurate measurements even in the presence of oxidation or oil films—complying with SD301-88 and DL/T 845.4-2004 standards.

Technical parameters

Product Overview

Traditional resistance testers (e.g., QJ44 bridge) use low-current methods, often producing inflated readings due to surface contamination. The LQHV-H100B solves this with high-current DC outputs (50A or 100A), penetrating oxidation layers to measure true contact resistance—critical for preventive maintenance and factory testing of HV switches and circuit breakers.

Key Specifications

• Test Current: Dual fixed outputs (50A or 100A DC)

• Measurement Range: 0-1999μΩ (resolution: 0.1μΩ)

• Accuracy: ±0.5% RDG ±2 digits

• Compliance: DL/T 845.4-2004, IEC standards

• Display: Stable LCD with ±1-digit repeatability under interference

Product Advantages

1. Dual-Current Testing

Switch between 50A or 100A DC for flexible testing needs, ensuring compliance with SD301-88 standards for circuit breakers and isolating switches.

2. High-Precision & Durability

Military-grade connectors and precision resistors minimize temperature/vibration effects, delivering reliable field measurements.

3. Anti-Interference Design

Maintains stable readings (±1 digit) even in electrically noisy environments, with excellent repeatability.

4. Portable for Field Use

Compact and lightweight (specify weight if available) for easy transport to substations or factories.

Applications

• Field maintenance of high-voltage switches and circuit breakers

• Factory acceptance tests (FAT) for power equipment

• Diagnostics for isolating switches and busbar contacts

• Preventive testing per SD301-88 regulations

Why Choose the LQHV-H100B?

1. Standard-Compliant: Meets DL/T 845.4-2004 and SD301-88 requirements for 50A/100A testing.

2. Accurate Diagnostics: Eliminates false readings caused by oxidation or oil films.

3. Rugged Design: Built for field use with military-grade components.

Note: For optimal accuracy, calibrate annually and use manufacturer-recommended test leads.