High Voltage Testing Services

The Load Tap Changer: The Most Critical Moving Component in Your Transformer

While transformer failures often get the attention, many transformer reliability issues begin with the Load Tap Changer (LTC).

A LTC is responsible for maintaining proper voltage under varying system conditions, often performing thousands of operations throughout its service life. Because it is one of the few mechanical components inside a power transformer, it is also one of the most common sources of transformer failures.

At HVTS, we provide comprehensive LTC inspection, testing, maintenance, and troubleshooting services designed to identify problems before they become costly outages.

Our capabilities include:

✔ Dynamic Resistance Measurement (DRM) testing
✔ Tap changer timing and transition analysis
✔ Motor drive mechanism inspections
✔ Contact wear evaluation
✔ Oil sampling and DGA analysis of LTC compartments
✔ Operational and control circuit verification
✔ Preventative maintenance and condition assessments

Many facilities focus on transformer testing while overlooking the LTC, despite industry data showing that a significant percentage of transformer failures originate within the tap changer system.

Whether you’re managing utility assets, industrial facilities, data centers, hospitals, or critical infrastructure, understanding the condition of your LTC can dramatically improve transformer reliability and reduce unexpected downtime.

Our experienced field personnel combine hands-on maintenance expertise with advanced diagnostic testing to provide actionable recommendations, not just test reports.

If your transformer’s LTC hasn’t been evaluated recently, now may be the time to assess one of the most important components protecting your electrical system.

📞 Contact HVTS to discuss your transformer maintenance strategy and learn how our team can help maximize asset life and reliability.

A Short Circuit, Coordination, and Arc Flash Study is one of the most valuable investments a facility can make in electrical safety and system reliability.

These studies do far more than satisfy compliance requirements, they help protect personnel, reduce downtime, and ensure your electrical system responds as designed when a fault occurs.

A properly engineered study helps:

⚡ Verify equipment interrupting ratings are adequate for available fault current.

⚡ Ensure protective devices are properly coordinated to isolate faults quickly and selectively.

⚡ Reduce arc flash incident energy by minimizing fault clearing times.

⚡ Identify opportunities for arc flash mitigation through settings adjustments, maintenance switches, zone selective interlocking, differential protection, and other engineered solutions.

⚡ Improve system reliability by reducing the likelihood of widespread outages caused by electrical faults.

As electrical systems evolve through expansions, equipment replacements, and process changes, studies can quickly become outdated. Decisions based on old data can leave both personnel and equipment exposed to unnecessary risk.

At High Voltage Testing Services (HVTS), we don’t just gather field data, we have experienced power system engineers on staff who perform Short Circuit, Coordination, Arc Flash, Load Flow, and Power Quality studies. By combining engineering expertise with real-world field testing experience, we provide practical solutions that enhance safety, reliability, and system performance.

The goal isn’t simply compliance. It’s ensuring your electrical system protects your people, your equipment, and your operation when it matters most.

⚡More Than Testing: Helping Contractors Get It Right the First Time ⚡

Medium-voltage projects don't end with pulling cable. Proper terminations, splices, testing, and phasing verification are all critical to a successful energization.

At High Voltage Testing Services (HVTS), we partner with contractors by providing independent MV cable testing and phasing verification to help identify issues before they become costly outages, equipment failures, or schedule delays.

But our support doesn't stop there.
✔️ Independent MV cable testing�✔️ Phasing verification before energization�✔️ Hands-on training for MV cable terminations and splices�✔️ Guidance on industry best practices and installation techniques�✔️ Assistance selecting the correct termination and splice accessories for each application

Too often, projects encounter delays because the wrong accessories were ordered, installation requirements were overlooked, or terminations were not completed correctly. Our experience allows us to help contractors select the right products the first time and ensure crews have the knowledge and confidence to install them properly.

Whether you need testing, commissioning support, training, or technical guidance, our goal is simple: help your project energize safely, on schedule, and without surprises.

⚡ THE complete source for all your power distribution needs – 24/7.


Supply

Growth doesn’t happen overnight in this industry. It’s built one outage, one project, one challenge, and one relationship at a time.

Looking back on our journey at High Voltage Testing Services, we are proud of how far we’ve come, not just in size, but in experience, capability, and trust. From emergency callouts to planned outages, commissioning, maintenance testing, and large-scale projects, every opportunity has helped shape who we are today.

What makes that growth meaningful is the people behind it:
⚡ Our team that shows up ready to perform safely and professionally
⚡ Our partners and customers who continue to trust us with critical infrastructure
⚡ The challenges that pushed us to improve and become stronger

The work is demanding, the hours can be long, and the responsibility is significant, but that’s exactly what drives us to continue improving every day.

We’re grateful for the relationships we’ve built and excited for what’s ahead as we continue growing and delivering for the power industry.