By comparing the thermal gradients of all three phases side-by-side, We can quickly spot problem areas in industrial three-phase electrical circuits.

The thermal image is a quick and easy way to detect apparent temperature differences in industrial three-phase electrical circuits. By examining the thermal gradients of all three phases side by side, we can spot performance problems quickly.

There are several potential sources of electrical unbalance: a power delivery problem, low voltage on one leg, or a breakdown of insulation resistance inside the motor windings.

Even a small voltage unbalance can cause connections to deteriorate, reducing the amount of voltage supplied, which motors and other loads will draw excessive current, delivery lower torque (with associated mechanical stress), and fail sooner. A severe unbalance can blow a fuse, reducing operations down to a single phase. Meanwhile, the unbalanced current will return on the neutral, causing the utility to fine the facility for peak power usage.

Commonly Inspected Components

We Capture thermal images of all electrical panels and other high-load connection points such as drives, disconnects, and controls. Where we can discover higher temperatures, follow that circuit and examine associated branches and loads.

We Check panels and other connections with the covers off. Ideally, we check electrical devices when they are fully warmed up and at steady state conditions with at least 40% of the typical load. This allows measurements to be properly evaluated and compared to normal operating conditions.

Abnormal heating associated with high resistance or excessive current flow is the main cause of many problems in electrical systems. Infrared thermography allows us to see these invisible thermal signatures of impending damage before the damage occurs. When current flows through an electric circuit, part of the electrical energy is converted into heat energy. This is normal. But, if there is an abnormally high resistance in the circuit or abnormally high current flow, abnormally high heat is generated which is wasteful, potentially damaging and not normal.

Ohm’s law (P=I2R) describes the relationship between current, electrical resistance, and the power or heat energy generated. We use high electrical resistance for positive results like heat in a toaster or light in a light bulb. However sometimes unwanted heat is generated that result in costly damage. Under-sized conductors, loose connections or excessive current flow may cause abnormally high unwanted heating that result in dangerously hot electrical circuits. Components can literally become hot enough to melt.

Our service will let you see the heat signatures associated with high electrical resistance long before the circuit becomes hot enough to cause an outage or explosion. Be aware of two basic thermal patterns associated with electrical failure: 1) a high resistance caused by poor surface contact and 2) an over loaded circuit or multi-phase imbalance problem.