The ZXHL-100P Contact Resistance Tester for High-Voltage Switchgear

Introduction: The Critical Role of Contact Resistance
In the realm of high-voltage power systems, the integrity of switching control equipment (circuit breakers, disconnect switches, contactors) is paramount. A key indicator of this integrity is contact resistance. Elevated resistance at current-carrying contacts leads to excessive heating, energy loss, accelerated contact degradation, and ultimately, catastrophic failure risks. Accurate, reliable measurement is therefore non-negotiable for maintenance and quality assurance.

Introducing the ZXHL-100P: Engineered for Accuracy and Stability
The ZXHL-100P Contact Resistance Tester addresses this critical need head-on. Leveraging high-frequency switching power supply technology and advanced digital circuit technology, it sets a benchmark for precision and stability in high-current micro-ohm measurement, specifically designed for the demanding environment of high-voltage switchgear testing.

Key Advantages & Technical Highlights:

Unwavering Precision & Resolution:

Utilizes dual-channel high-speed 16-bit Σ-Δ AD sampling for exceptional accuracy.

Achieves a remarkable resolution of 0.01 μΩ (0-99.99 μΩ range) and 0.1 μΩ (100.0-2999.9 μΩ range).

Delivers an overall accuracy of ±(0.5% of reading + 2 digits), ensuring trustworthy data for critical decisions.

Stable High-Current Output:

Provides fixed, continuous DC output options of 50A or 100A, essential for overcoming contact film resistance and obtaining true bulk metal values.

"Continuously output high current" design guarantees consistent current application throughout the test duration (configurable from 5s to 599s), leading to reliable and repeatable results.

Superior Stability & Repeatability:

Engineered for high stability, exhibiting a final display fluctuation within ±1 digit.

Offers excellent reproducibility – critical for tracking trends over time and comparing results across equipment or phases.

Robustness for Field & Factory:

Incorporates a temperature compensating circuit to maintain accuracy across varying ambient conditions.

Features good vibration resistance performance, enhancing reliability during transport and use in substation environments.

Thermal shutdown protection safeguards the instrument during extended use.

Operational Efficiency:

Automatic range switching simplifies operation and speeds up testing.

Rotary knob control provides an intuitive user interface.

Large LCD display offers clear visibility of readings.

Compact and lightweight (8kg) relative to its power output (600W), enhancing portability.

Data Management & Connectivity:

Stores up to 200 test records internally.

Features real-time save & print functionality.

Offers communication via USB or RS232 serial port for data transfer and integration.

ZXHL-100P vs. Traditional/Alternative Methods:

Vs. Low-Current Testers (e.g., 10A models): The ZXHL-100P's high current (50A/100A) is far more effective at breaking through oxidation films and contact surface contaminants on high-voltage contacts, providing a measurement much closer to the true bulk resistance under actual operating current densities. Low-current testers often significantly underestimate potential problems.

Vs. Older High-Current Testers: The ZXHL-100P surpasses many older designs through its:

Digital Stability: ±1 digit stability vs. potentially fluctuating analog meters.

Micro-Ohm Resolution: 0.01μΩ resolution provides much finer diagnostic capability.

Advanced Protection: Built-in thermal shutdown and intelligent features.

User Interface: LCD display, data storage, and communication ports offer modern convenience and traceability.

Portability: Its size and weight are generally favorable compared to older, bulkier 100A testers.

Vs. Kelvin Bridges (Manual): The ZXHL-100P offers dramatic speed advantages (automatic ranging, quick setup), eliminates operator error inherent in manual balancing, provides digital results and storage, and is far more portable.

Technical Specifications Summary:

Conclusion: The Reliable Choice for Critical Measurements
The ZXHL-100P Contact Resistance Tester represents a significant advancement for technicians and engineers responsible for the health and reliability of high-voltage switching equipment. Its combination of high precision (down to 0.01μΩ), exceptional stability (±1 digit), robust high-current output (50A/100A), and practical features like programmability, data storage, and connectivity make it an indispensable tool. Whether deployed in a high-voltage switch manufacturing environment for quality control or in the field for critical maintenance diagnostics, the ZXHL-100P delivers the accuracy, reliability, and efficiency needed to ensure system safety and performance. It effectively overcomes the limitations of older testers and low-current methods, providing confidence in the measurement of one of the most vital parameters for switchgear health.

GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/