Tech Notes: RxMS Power Quality Topics

Explanations to help determine common power quality issues:

Room Temperature and Relative Humidity:
Many people are unsure of how all aspects of Room Temperature and Relative Humidity are defined.

PQS-01: Pulse Width Modulated UPS:
A large uninterruptible Power Supply (UPS) feeds a medical imaging system. Initial power monitoring uncovers a high frequency current on the output of the UPS, into the medical imaging system. Is this high frequency current real?

PQS-02: Wandering Waveform Distortion:
Most people who are familiar with power quality know that single phase, high crest factor loads can cause voltage flat topping. But what causes voltage “peaking”?

PQS-03: Floating or Grounded Power:
How can you diagnose loose, disconnected, or floating neutrals and grounds? With most power monitors – you can’t!

PQS-04: Motor-Generator Set Impedance:
A 75 KVA Motor Generator Set had been installed to protects a 30 KVA Magnet Resonance Imaging system. Why was the output voltage so distorted?

PQS-05: Identifying Utility Switching Impulses:
How do you identify utility switching or power factor correction capacitor caused impulses?

PQS-06: Deriving 208 VAC Power:
Do you have a piece of equipment that requires both 120 VAC and 208 CAC power, and might require power protection? Some things you need to know about how that voltage is derived!

PQS-07: Identifying the Source of Sag:
Many power quality monitors can identify and quantify a voltage sag. Identifying the cause of such a sag is often tricky. However, monitoring the current is critical to reaching a proper diagnosis.

PQS-08: RMS Voltage and Current Logs:
Understanding and using the RxMS Voltage and Current Logs as supplied by Rx Monitoring Services.

PQS-09: Load Generated Impulses:
Voltage Impulses can be created at the utility level, within the facility, or by the sensitive load itself. Examining the low frequency voltage and current data associated with impulses provides useful clues to determining the source of impulses.

PQS-10 Voltage Outages:
Voltages Outages or Power Failures appear, at first glance, to be simple to diagnose. But there are some ways to fine-tune the diagnosis and the data interpretation.