— A Field Report from Wuhan KDZD’s After-Sales Team in Guangxi and Zhuzhou
In the sweltering heat of July, as scorching temperatures blanketed southern China, the after-sales technical team from Wuhan KDZD Electric Co., Ltd. braved the elements to travel over a thousand miles. Their mission: to provide on-site support for two key clients—the Guangxi Institute of Metrology and CRRC Zhuzhou.
The team successfully executed a comprehensive suite of services, including the installation and commissioning of Lightning Impulse Voltage Generator systems, standardized waveform verification, hands-on operational training, and emergency fault repairs. Through expert high-voltage testing skills, rapid emergency response, and meticulous lifecycle support, the team delivered on both critical assignments. This mission perfectly exemplifies KDZD’s core philosophy: building our business on technical excellence and unwavering service, while honoring our promise of 24/7 after-sales support.
Lightning Impulse Voltage Generators are the gold standard in high-voltage metrology and rail transit electrical testing. These systems precisely simulate natural lightning surges (1.2/50μs standard waves) and switching overvoltages (250/2500μs operational waves) in strict accordance with GB/T 16927.1-2011 standards. Whether for traceability calibration at metrology institutes or insulation type testing on traction equipment, the precision and operational integrity of this equipment are non-negotiable.
This dual-location mission presented distinct challenges: one required the flawless commissioning and training for a brand-new system, while the other demanded an urgent rescue mission for legacy equipment. Both tested our engineers' deep technical reserves and on-site adaptability to the limit.

Mission in Guangxi: Commissioning and Comprehensive Training for the Metrology Institute

On July 13, a senior high-voltage test engineer departed from Wuhan for the Guangxi Institute of Metrology to oversee the two-day delivery of a new Lightning Impulse Voltage Generator system. As a provincial statutory metrology body, the institute’s new high-voltage impulse testing platform had to meet the stringent CNAS laboratory accreditation standards. Every calibration step and waveform data point required complete traceability.
Upon arrival, our engineer collaborated with the institute’s electrical testing director to develop a customized installation plan tailored to the lab's layout, grounding system, and environmental conditions. The comprehensive system—comprising a multi-stage Marx generator, intelligent control console, resistive-capacitive divider, digital oscilloscope, chopping spark gap, and high-voltage safety interlocks—was meticulously installed. Special attention was paid to high-voltage lead routing and independent low-impedance grounding to eliminate stray capacitance interference and ensure absolute safety.
Once hardware installation was complete, the team moved to waveform calibration. Rigorous no-load and load tuning tests were conducted. For the 1.2/50μs lightning wave, wave-front and wave-tail resistors were fine-tuned through multiple high-voltage cycles to ensure parameters remained strictly within national standard tolerances (wave-front time 1.2μs ±30%, half-peak time 50μs ±20%). For the 250/2500μs operational wave, charging voltages and divider ratios were precisely matched to correct waveform distortion. Multiple test runs confirmed perfect data consistency, meeting the strict accuracy requirements for legally binding calibration reports.
Following successful acceptance, a two-day specialized training program commenced. Recognizing that several operators were relatively new to impulse equipment, our engineer employed a four-tier teaching model: theoretical instruction, step-by-step demonstration, individual hands-on practice, and troubleshooting Q&A. The curriculum covered everything from generator principles and safety protocols to atmospheric correction calculations. Operators were guided through the entire process—from boot-up and polarity switching to waveform acquisition and archiving—with special emphasis on chopping tests and multi-impulse withstand voltage tests.
By the end of the deployment, all on-site personnel were fully capable of independently operating the system, tuning standard waveforms, and exporting compliant data. The institute’s project director highly commended the results, and the equipment was officially integrated into daily metrology operations, strengthening the region's high-voltage traceability infrastructure.

Emergency Response in Zhuzhou: Rapid Troubleshooting for CRRC

Without missing a beat, our engineer traveled to Zhuzhou, Hunan, arriving on July 18 to address an urgent service request at CRRC Zhuzhou. As a leading rail transit equipment manufacturer, CRRC relies on KDZD’s impulse systems for type testing on traction transformers and insulators. Any downtime directly threatens their R&D and production schedules.
Initial diagnostics revealed that while the system powered on, the control console was experiencing communication anomalies, preventing synchronized charging, triggering, and waveform acquisition. By systematically checking the power circuits, communication buses, and control logic, our engineer identified a parameter corruption issue in the communication module. After re-matching the control program and resetting the linkage parameters, the basic charging and triggering functions were restored.
However, during re-testing, a new issue emerged: the communication link between the console and the digital oscilloscope failed, halting waveform acquisition. After exhaustive troubleshooting of cables, IP configurations, and signal converters, the issue was traced to a hardware failure in the oscilloscope’s internal signal acquisition unit. With no spare parts available on-site, an immediate closed-loop repair plan was activated.
To minimize downtime, CRRC shipped the faulty oscilloscope back to KDZD’s Wuhan manufacturing facility. Our technical team expedited the disassembly, replaced the faulty acquisition chip, recalibrated the measurement precision, and conducted a full aging test to ensure factory-standard performance. We then provided remote, step-by-step guidance for the client to reinstall and recalibrate the unit on-site.
Upon reconnection, the entire system—console, generator, divider, and oscilloscope—communicated seamlessly, and data acquisition was fully restored. CRRC highly praised KDZD’s rapid response and end-to-end tracking, which successfully resolved a critical bottleneck in their testing operations.

Building Competitive Advantage Through Service Excellence

Completing both a new equipment handover and an emergency repair across two provinces in a single week is a testament to KDZD’s robust national service network. As a high-tech enterprise integrating R&D, manufacturing, and service for high-voltage testing equipment, we view after-sales support as a core competitive advantage.
Unlike vendors offering only basic supply, KDZD leverages over a decade of R&D experience to provide deep technical support. Our engineers possess full-lifecycle expertise—from factory calibration to complex field repairs. Whether helping metrology institutes pass CNAS/CMA accreditations with standardized documentation, or providing dedicated, priority repair channels for manufacturers like CRRC to ensure zero production interruptions, we deliver customized solutions to eliminate technical pain points.

Looking Ahead: A Commitment to Lifecycle Partnership

The successful conclusion of this cross-regional mission has provided invaluable field insights for optimizing our national service framework. Moving forward, KDZD is upgrading its capabilities in three key areas:

1. Expanding Regional Teams: Deploying dedicated engineers across Central, South, Southwest, and East China to further reduce response times.
2. Digitalizing Maintenance: Launching a remote online diagnostic platform to resolve software and communication issues virtually, saving clients time and shipping costs.
3. Proactive Client Engagement: Institutionalizing regular site visits for preventive maintenance and operator refresher training, shifting from reactive repairs to proactive care.

From R&D to installation, training, emergency repairs, and lifelong technical support, Wuhan KDZD remains steadfast in our belief that "products are our foundation, and service is our soul." This thousand-mile journey is just one chapter in our ongoing commitment. We will continue to refine our product quality and elevate our service standards, providing reliable, high-voltage testing solutions that empower the high-quality development of China's power and rail transit industries.