4  FM quick reads on power

1. Diagnostic and Monitoring: Tools to Analyze Power Quality


This is Chris Matt, Managing Editor of Print & E-Media with Maintenance Solutions magazine. Today's tip is using diagnostic and monitoring tools to analyze power quality.

Increased demands for indoor air quality (IAQ) have resulted in the need for technicians to more closely monitor and document conditions in buildings. While centralized automation systems can monitor overall conditions in a building, most IAQ problems are localized. Detecting and addressing these problems requires the use of monitoring equipment.

The latest generation of portable IAQ monitors allows technicians to measure carbon monoxide, carbon dioxide, relative humidity and temperature. They also can record particle counts, measure volatile organic compounds, determine airflow, and measure differential pressure. Technicians can collect data and read it from the unit or upload it to a laptop computer for analysis.

But looking beyond IAQ, technicians also are using monitoring technology to analyze power quality. As more facilities use electronic and computer-based systems to monitor operations, they will require greater amounts of high-quality, stable power. Problems such as sags, spikes, transients and harmonics can easily disrupt the operation of this equipment.

Traditionally, it was difficult to track the causes of these problems. New-generation, portable equipment has improved to the point where technicians can use it to measure and log current, voltage, power factor and energy, while watching for voltage transients and other related problems.

Units offer cycle-by-cycle power analysis and can identify transients depending on the sampling rate, with the more sensitive units offering up to 512 samples per cycle. Most units offer eight sampling channels — four for voltage, four for current. Built-in memory allows users to collect and store data over an extended period.


Power Management: Demand Response & The Grid

This is Chris Matt, Managing Editor of Print & E-Media with Maintenance Solutions magazine. Today's tip focuses on demand response and power management.

Most institutional and commercial facilities operate on flat rates from electric utilities. In most cases, utilities base these rates on calculations of the average cost of power delivered to customers. This method has worked for years, but a growing reliance on cooling systems has created a large demand on the electrical grid for reliable power at reasonable rates.

Now, utilities face the choice of buying power from other utilities at high, sometimes unstable rates or building expensive power-generation facilities to meet peak demands. Utilities can use several options to address this situation. They can conduct energy-conservation programs that encourage customers to use less power during peak times. They also can employ smart meters that allow users to track consumption and reduce the amount of energy used during peak-load times.

Another method is to develop demand-response, or peak-shaving, programs.

Some utilities' peak-shaving programs alert a facility when it should go off the grid and generate its own power. Facilities often use natural gas and diesel-powered generators in such situations. Some facilities can operate completely off the grid for a few hours or even several days. Such facilities benefit from lower rates because they meet monthly generating-testing requirements, and managers know the facilities can operate properly when grid power is not available.

In some cases, utilities have generation partner programs, in which the utility buys back the power that facilities generate via alternative sources. This usually is accomplished using two utility meters. One meter is the normal meter that reads the amount of power a facility buys from the utility. The second meter reads the amount of power the utility buys from the facility.

Control systems on the market can monitor the current price of power the utility charges and the price the utility pays for power. As a result, the facility control system either can use the available green power on site or sell it back to the utility.


RELATED CONTENT:


power , power quality , airflow , iaq , harmonics



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