Helios Electric

05/22/2026

Memorial Day | Honoring the Fallen

This Memorial Day, Helios Electric pauses to remember and honor the brave men and women who gave their lives in service to our country.

Their sacrifice is the foundation of the freedoms we live and work by every day. Memorial Day is a time for reflection, gratitude, and respect for those who made the ultimate sacrifice.

We extend our deepest appreciation to the fallen heroes and their families. Today, and always, we remember.

05/21/2026

Protect Your Water Infrastructure Before the Next Transient Event Hits

Water hammering isn’t just a nuisance—it’s a serious risk to critical infrastructure. Sudden changes in pump speed can create pressure surges strong enough to damage pipes, disrupt service, and drive costly repairs.

At Helios Electric, we engineer solutions that go beyond basic mitigation—we design for resiliency and long-term reliability. A standard Variable Frequency Drive (VFD) already improves system performance by smoothing pump starts and stops, reducing the rapid flow changes that cause pressure spikes. But we take it further with advanced “flying restart” integration. Our specialized electrical designs enable your system to: Recover instantly from momentary power interruptions, Synchronize with a spinning motor in real time, Eliminate hydraulic and mechanical shock during re-energization.

The result? A smarter, more resilient pumping system:
- Minimized risk of water hammer and pressure surges
- Reduced wear on pumps, motors, and piping infrastructure
- Faster system recovery and improved uptime
- Lower maintenance costs and extended asset life

Instead of forcing your system through hard stops and restarts, Helios designs systems that keep moving—smoothly and intelligently—even through disturbances. This is the difference between reacting to failures and engineering them out from the start.

If your water or wastewater system can’t afford unexpected downtime, it’s time to rethink your electrical design strategy. Let’s talk about how Helios Electric can help you build a more reliable, future-ready system. Visit us at www.helioselectric.net.

05/13/2026

What Is Trip Coil Monitoring—and Why Does It Matter?

In electrical power systems, circuit breakers are your first line of defense for system protection – and the trip coil is what triggers them to open during a fault. But what happens if that trip coil fails when you need it most?

That’s where Trip Coil Monitoring (TCM) comes in.

What is Trip Coil Monitoring?
Trip coil monitoring continuously supervises the health and continuity of a breaker’s trip circuit. It detects issues like open circuits, loss of control power, or wiring faults – before they prevent a breaker from operating.

Key Benefits:
• Increased reliability – Ensures breakers can operate when faults occur
• Early problem detection – Identifies issues before they become failures
• Reduced downtime – Prevents unexpected outages and equipment damage
• Enhanced safety – Protects personnel and critical infrastructure

How We Can Help
At Helios Electric, we design and implement solutions beyond just basic protection. We integrate advanced monitoring solutions that provide real-time visibility into critical circuits helping you stay ahead of failures, not react to them.

Ready to strengthen your protection system? Contact us today to learn how we can enhance your system’s reliability and reduce risk.

05/06/2026

Incipient Fault Protection – Prevent Problems Before They Become Failures

Power outages don’t happen suddenly—they start as incipient faults: small, hidden electrical issues that quietly develop over time until they become serious enough to interrupt your power system or cause equipment damage.

Incipient Fault Protection is designed to detect these early warning signs—such as insulation deterioration, intermittent faults, or abnormal current patterns—before they escalate into costly failures.

By properly implementing an incipient fault protection scheme, you can forecast an electrical fault before it happens and before it interrupts your mission critical process. When a breaker has tripped on fault, it is sometimes too late!

By identifying issues early, you can move from reactive maintenance to a predictive, smarter approach to power system protection—saving you time and money.

Protect smarter. Act earlier. Build resilience into your power systems.

04/30/2026

Switch‑On‑To‑Fault (SOTF) Protection: Why It Matters When Energizing Power Systems

Switch‑On‑To‑Fault (SOTF) protection is a specialized relay function designed to protect electrical systems at the exact moment a breaker is closed. If a fault already exists—due to wiring errors, insulation failures, or maintenance oversights—SOTF detects and clears it almost instantly.

During energization, conventional protection settings are often restrained to accommodate motor inrush or transformer magnetizing current. While effective during normal operation, these delays can allow severe fault energy to develop if a fault is present at startup.

SOTF solves this problem by briefly enabling high‑sensitivity, ultra‑fast protection immediately after a breaker closes. If no fault is detected, the relay automatically returns to its normal settings. If a fault is present, it is cleared before serious damage occurs.

• Reduced equipment damage
• Lower arc‑flash energy
• Improved personnel safety
• Greater system reliability during commissioning and reenergization

SOTF protection is especially valuable in industrial facilities, data centers, medium‑ and high‑voltage systems, and anywhere equipment is frequently switched or maintained.

A simple feature—but one that can make a critical difference when it matters most.

04/02/2026

Transformer Differential (87T) vs. Restricted Earth Fault (REF) Protection — What’s the Difference?

Transformer differential protection compares the current entering and leaving the transformer. Under normal conditions, these currents balance. If an internal fault occurs, the imbalance is detected and the transformer is quickly isolated. This method provides broad and fast protection against most phase-to-phase and winding faults within the transformer zone.

However, transformer differential protection has a small sensitivity gap when it comes to low-level internal earth (ground) faults—especially those close to the neutral point. These faults may not produce enough differential current to operate the relay reliably.
This is where Restricted Earth Fault (REF) protection plays a vital role. REF protection is specifically designed to detect internal ground faults within a defined portion of the transformer winding. It is highly sensitive and operates quickly for earth faults that could otherwise remain undetected by differential protection alone.

Bottom Line:
While transformer differential protection provides comprehensive coverage for most internal faults, supplementing it with REF protection closes the gap by supervising sensitive earth faults—resulting in a more secure and complete transformer protection scheme.

To learn more about applying the optimal system protection for your expensive, mission-critical electrical infrastructure, we are here to support you!
https://www.helioselectric.net/power-system-studies

03/25/2026

Implementing High Speed Motor Bus Transfer Schemes for Critical Heavy Industry Applications… You may be thinking: “Use layman terms, please!”

So, what exactly is a High-Speed Motor Bus Transfer Scheme? Basically, this is an electrical philosophy that quickly switches a group of active motors from one power source to another without causing an undesirable system shutdown when the normal electrical supply is lost.

In early decades of circuit breakers, after a circuit breaker was tripped, most were often reclosed manually, and those that could be closed electronically required substantial control power, causing the restoration process to be slow. As technology improved, power source transfer capability between sources began to be offered by switchgear manufacturers. Today, digital logic with intelligent relaying makes transfer options even more flexible.

The classic “Main-Tie-Main” switchgear configuration consists of two power sources (main breakers) and a tie circuit breaker between them to allow the flow of power when one source is lost or de-energized for maintenance. When one source is removed, the normally open tie breaker is closed which places both buses on the remaining active source. This is initiated either manually by an electrician or “automatically” with voltage sensing, status feedback, and digital logic within intelligent relaying.

Modern relays can monitor electrical system conditions very granularly and respond to system conditions in a manner that causes active motors to not shut down during a power outage. There are multiple ways that this can be accomplished: Fast Bus Transfer, In-Phase Transfer, and Residual Bus Transfer, each one with their own advantages.

To learn more about the technical details and what would be the best solution for your application, please reference the following resource:

https://www.helioselectric.net/blog/motor-bus-transfer

03/13/2026

Have you ever looked at a transformer and thought about how its health can be correlated with your own body? No? Well, you wouldn’t be the first. The fact is that just like a stroke or a heart attack for us, hearing noise or seeing smoke from a transformer means it might already be too late!

Just like a blood sample can be used to gauge the health of your body, the oil in a transformer can be used to gauge the health of a transformer. By taking a transformer oil sample and performing a dissolved gas analysis (DGA), concentration levels of hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide can be measured. Similar to blood tests measuring your health metrics for preventative care, the DGA measurements of gas in the oil can be used to detect internal faults due

to overheating, arcing, or partial discharge. Transformer failures can be prevented with routine transformer testing with the results interpreted by an experienced professional electrical engineer.

If you are observing signs of an impending transformer failure or simply need to gauge the health of your older transformer, contact us for an assessment and a recommendation for corrective action.

If you do not take the time to schedule maintenance, your equipment will schedule it for you! We always recommend proper testing and maintenance of electrical equipment for long-term reliable operation!

To learn more

https://www.helioselectric.net/blog/industrial-transformer-selection

Power transformers for distribution, transmission, and industrial applications have unique requirements. These can include three windings, extended overloading, and harmonic mitigation. Arc furnace, direct flux regulation booster regulation and rectifier transformers require unique capabilities.

03/04/2026

If you work with complex three-phase power systems for heavy industry, you’ve likely run into the concept of Negative Sequence.

In a perfectly balanced three-phase system, the magnetic field rotates in a specific order. This is recognized as the Positive Sequence, and it is what makes motors rotate in the desired direction. Negative Sequence occurs when phasing is reversed causing the magnetic field to rotate in the opposite direction of the motor’s intended spin.

Why should you care?

Think of it like trying to run forward while someone is pushing against you. It creates:

● Excessive Heat: Even a small amount of negative sequence current can cause massive rotor overheating.

● Vibration: The opposing magnetic fields create mechanical stress and audible "chatter."

● Efficiency Loss: You’re literally fighting your own power supply, wasting energy as heat.

Common Culprits

1. Unbalanced Loads: One phase pulling significantly more current than the others.

2. Open Phases: A blown fuse or a "single-phasing" event within the electrical system.

3. System Faults: A Line-to-Ground or Line-to-Line fault within the electrical system.

Protection Solution
We recommend implementing ANSI-46 protection using digital relaying appropriate sensing devices to monitor phase current imbalances and the magnitude of the negative sequence current.

For a consultation on how to improve the protection on your rotating machines (such as motors and generators), please contact us for a custom solution.

To learn more:

https://www.helioselectric.net/blog/emergency-power-generator-protection

02/16/2026

This Presidents’ Day, we salute the leaders who built our nation and all the hardworking people who keep it running today.