Our Expertise

We offer comprehensive consulting services to detect, analyze, and mitigate negative sequence currents in three-phase systems. These currents—often caused by unbalanced loads, faults, or system anomalies—can compromise stability, accelerate equipment wear, and degrade power quality.

Our solutions include:

• Advanced protection schemes
• System optimization strategies
• Equipment reliability enhancement
• Long-term sustainability planning

What Is Negative Phase Sequence?

In a balanced three-phase system, each phase carries equal current, spaced 120° apart. However, faults or unbalanced loads can disrupt this harmony, producing negative sequence currents—vectors rotating clockwise and causing instability.

Common causes include:

• Single-phase faults (e.g., broken conductors)
• Unbalanced loads or impedances
• Network abnormalities

Positive vs Negative Sequence

Positive Sequence

Currents flow in the order Phase A → B → C (Red → Yellow → Blue).

Negative Sequence

Currents flow in the altered order Phase A → C → B (Blue → Yellow → Red).

Harmonic Distortion Example

The video below shows a 6% voltage drop in one phase and a 10% third harmonic distortion across all phases. Notice how Yellow and Blue exceed standard voltage levels.

Effects of Negative Sequencing

Heating & Overloading

Negative sequence currents generate counter-rotating magnetic fields, increasing losses and overheating motors, generators, and transformers.

Voltage Imbalance

Imbalances across phases degrade supply quality, reduce efficiency, and impair motor performance—causing flickering lights, voltage sags, and equipment malfunctions.

System Instability

Excessive imbalance can trigger voltage collapse, blackouts, and malfunction of relays and regulators—threatening system-wide reliability.

Protection System Disruption

Unbalanced currents may mislead protective relays, resulting in poor fault detection and inadequate isolation—compromising safety and increasing outage risks.

Don’t let hidden electrical chaos dictate your performance.

Power imbalances are the unseen threat costing your commercial or industrial facility dearly—through unexpected downtime, premature equipment failure, and steep maintenance bills. This isn’t just abstract theory; it’s the tangible, financial reality of poor power quality.

Stop managing your operations by reacting to failures. Start dominating your electrical environment with strategic insight.

”Navigating Power Imbalances” is your definitive playbook to move from risk to resilience. It equips you with the technical knowledge and practical steps needed to identify, analyze, and neutralize these threats *before* they impact your bottom line.

In the video below, the three-phase waves are displayed with the phase-displacement 120-degrees, but Phase 2 (yellow) voltage is reduced by 6%, which may result in 3rd harmonics disturbance represented by the thinner solid line (5% 3rd harmonic) and dotted line representing a 2% 5th Hamonic.

Transform instability into absolute operational control.

Click below to download your copy and secure your facility’s future.