What are they?
Examples of non-linear loads include:
- Fluorescent lighting
- Variable-speed drives
- Industrial Controls Systems
- Complicated Robotics Systems
- UPS Systems
- Common office equipment such as computers and printers
Current harmonics are caused by non-linear loads. When a non-linear load, such as a rectifier is connected to the system, it draws a current that is not necessarily sinusoidal.
Harmonics in power systems of are generated by non-linear loads. Semiconductor devices like transistors, IGBTs, MOSFETS, diodes etc are all non-linear loads. Further examples of non-linear loads include common office equipment such as computers and printers, Fluorescent lighting, battery chargers and also variable-speed drives. Electric motors do not normally contribute significantly to harmonic generation. Both motors and transformers will however create harmonics when they are over-fluxed or saturated.
Voltage distortion — a function of harmonic current and system impedance — is worse on ‘soft’ electrical systems with low available fault levels. So, users at the end of the utility distribution in remote locations or users who operate under generator power are more likely to experience issues relating to excessive voltage distortion.
The other issue with voltage distortion is that it causes harmonics to propagate throughout the network to the linear loads as well.
Linear loads are just that — linear. If you apply a triangular voltage wave to a linear load, such as a full-voltage across-the-line motor, it will try to draw a triangular current waveform. Consequently, as voltage distortion increases, linear loads begin to draw harmonic current.
Have an ICP site survey done to survey your facility and install a power metering device.
When you install equipment that will correct power and hold voltage within your facility, you will be providing your facility with protection against all outside influences of power. Halting wear and tear on other equipment in the facility by having stable voltage and power factor is the goal. The long term positives are lowered operations and maintenance costs by limiting voltage and amperage anomalies inside the facility. It is common to vet these issues by installing a monitoring device at the service entrance of the facility utility power. This is a low-cost method to really understand these issues and to make a proper diagnosis.
We are available to review electrical one-lines, Power Reports, Demand Usage, and any other data on your facility power.
Call your ICP Technical Representative today to discuss options to increase efficiency in your facility and correct our facility power issues!