電力品質

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電力品質に関するすべての記事

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力率とは何か、なぜそれが重要なのか

力率とは何か、なぜそれが重要なのか 力率の式の計算方法と各要素、および式が重要である理由を学びます。

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単相と三相の電源、単相電源と三相電源の違いとは?

用途や構成など、単相電源と三相電源の違いについて学びます。

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古い電気システムにおける電力品質問題の診断

フルークのマルチメーターとオシロスコープを使用した、古い電気システムの電力品質問題の診断方法をご覧ください。

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Detecting power quality issues

The electrical power issues that most frequently affect industrial plants include voltage sags and swells, harmonics, transients, and voltage and current unbalance. The proper tools to correct these issues include knowledge and electrical test instruments ideally suited for each task.

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Common Power Quality Factors Affecting Transformers

Transformers supplying nonlinear loads should be checked periodically to verify operation within acceptable limits. Transformers are also critical to the integrity of the grounding system.

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Electronics in your building don't like power problems

As we have seen, power problems have a bad effect on electronic devices. To detect a power problem, a technician will first check out the power supply to a device to make sure it is functioning properly.

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Remote power monitoring for maintenance managers

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Why is there an arrow on your current clamp?

Learn why on all current clamps and current clamp accessories, there is an arrow placed close to the beak or inside the beak opening.

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How to diagnose high-voltage surge arresters

How to diagnose a high voltage surge arrester with a Fluke thermal imaging camera.

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How to set up the 1748 power quality logger

The most important step in any measurement process is setting up your measurement device correctly. Do this incorrectly and you can find out your data is useless after a measurement cycle of days or weeks. That means starting all over again—if you can.

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Get peak variable speed drive efficiency through power quality analyzer

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How to find the root cause of intermittent production stops

How to find the root cause of production line stoppage and reduce downtime in manufacturing.

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How to use a phasor diagram?

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How to track faults in overhead utility cables

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Future proofing your Power Quality measurement equipment with IEC 61000-4-30 third edition

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For installation, a digital multimeter is no longer enough

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Find problems early by monitoring motor and drive efficiency

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Connecting to power quality loggers remotely

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How to collect data with the Fluke 1748 Power Quality Logger?

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Why does cable length between VFDs and motors matter?

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How to setup the 173x series energy logger

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Electrical Power Explained – Part 3: Balanced three-phase AC power

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Voltage fluctuations, flicker and power quality

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Case study: See how the 438-II Motor Analyzer is building an underwater fan club

Watch the video to see how the Point Defiance Zoo and Aquarium uses the Fluke 438-ii power quality analyzer and motor analyzer to reduce water and energy use.

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What does the IEC 61000-4-30 Class A standard mean to me?

The IEC 61000-4-30 Class A standard takes the guesswork out of selecting a power quality instrument.

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How to improve power factor

Learn how to improve power factor, including specific solutions for different root causes of poor power factor.

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5 ways test tools can improve safety around rotating machinery

The electrical hazards associated with electro-mechanical equipment are severe and the electrical safety PPE requirements are extensive. But what about safety concerns from the mechanical side of rotating machinery?

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Comparing the Fluke 438-II and Fluke MDA-500

Extend motor drive production performance, trend data over time and troubleshoot excess energy consumption. Compare the 438-II Power Quality and Motor Analyzer and the Fluke MDA-550 Motor Drive Analyzer.

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5 Reasons to Monitor Power Consumption

Why monitor power consumption with a power logger? Get the data you need to make important energy management decisions including plant safety, cost savings, and power quality troubleshooting.

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Case study: Clean Power Delivers Clean Water

Maintenance electrical specialist Mark Newport was in the process of installing new electronic power factor correction units at multiple motor control centers (MCCs) to improve power quality, protect equipment and reduce costs.

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Case study: Finding a Power Quality Needle in a 30-Mile Haystack

At the end of April 2005, Crystal Mountain Resort in Washington suffered catastrophic failure of two power filters associated with their chair lifts.

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Case study: Fluke Instruments Add Reliability to Oceanographic Research

It was in his capacity as an electrical troubleshooter and an electronics expert that Gagne, almost two years ago, first began to use a Fluke 434 Power Quality Analyzer and a Ti30 Thermal Imager.

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Case study: Instant Power Replay Solves a Breaker Trip

After experiencing some nuisance tripping of breakers in the subpanel feeding the second floor of this industrial building, we installed a Fluke 1750 Power Recorder at the subpanel to gather information about power usage.

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Case study: More Snow With Power Quality

A ski resort near Silverthorn, CO., depends on its snowmaking capacity to augment nature's snowfall, especially during drought years.

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Case study: Overheated Transformer

You could almost call it a happy accident. During a routine job at a large industrial facility, an electrical maintenance worker set a plastic kit on top of a nearby transformer.

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Case study: Performing Power Quality Studies and Troubleshooting Loads

Mac McArthur performs power quality studies for commercial, industrial, and residential clients.

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Causes and effects of harmonics in electrical power systems

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Electric motor efficiency and reliability: New testing approach matches real world conditions

Measure torque while motors are still in service using an advanced tool that eliminates external torque and speed sensors.

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Electrical Noise and Transients

Electrical noise is the result of more or less random electrical signals getting coupled into circuits where they are unwanted, i.e., where they disrupt information-carrying signals.

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Fluke electrical analysis tool verified to measure torque without halting motor operation

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How Adjustable Speed Drives Affect Power Distribution

Adjustable speed drives (ASDs) can be both a source and a victim of poor power quality.

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Is it the Motor, the Drive, or the Load?

In troubleshooting situations involving a motor, more than half the battle is simply isolating the problem.

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Making Watt-Hour Measurements with Fluke Power Quality Analyzers

The need to manage power is never more critical than when power prices skyrocket and power quality becomes suspect.

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Measuring output torque without mechanical sensors

Measuring output torque without mechanical sensors

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Power Quality at the Service Panel

Voltage sags, tripping breakers, overheated electrical panels, and excessive voltage levels are all indications of possible trouble in an electrical distribution system.

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Power Quality Measurements at Receptacle Branch Circuits

Many power quality problems show up at the branch circuit level. There's a simple reason for this: that's where most of the sensitive loads (and sensitive employees) are located.

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Simplify troubleshooting: Making sense of electrical signals

Rely on the Fluke 120B Series Industrial ScopeMeter® Handheld Oscilloscopes when your work calls for detailed and accurate signal measurements.

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The Power Of A Waveform: Expanded Troubleshooting Options With The Fluke 345 Power Quality Clamp Meter

Electricians are discovering that the new Fluke 345 goes beyond simply monitoring voltage or current. It displays waveforms and harmonics, performs power measurements for power-factor evaluations, measures inrush current, and logs data over time for later analysis.

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Troubleshooting Power Harmonics: Basic Troubleshooting Using Multimeters and Current Clamps

This application note details the procedures for using Fluke power quality analyzers for average watt measurements and converting those to watt-hours.

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Troubleshooting power quality issues in critical medical diagnostic equipment

Diagnosing and troubleshooting power quality issues in medical equipment in hospitals and health care facilities.

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Turning electricians into power quality detectives in data centers

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What Does Class A Mean To Me?

Power quality measurement is still a relatively new and quickly evolving field. Whereas basic electrical measurements like RMS voltage and current were defined long ago, many power quality parameters have not been previously defined, forcing manufacturers to develop their own algorithms.

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Case study: Three-Phase Motor Failure

For three years in a row, a particularly large three-phase motor would fail twice a year. The facility maintenance manager called in both the electrical contractor and the motor manufacturer, who pointed fingers at each other but failed to resolve anything on site.

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Case study: Network Hub Failure

Ever fixed something and still not solved the problem? Sometimes multiple deficiencies can all cause the same symptoms.

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Case study: Low Power Factor

Because power quality issues are difficult to pinpoint, clients often reach the wrong conclusions about their power issues. That often leads to expensive solutions that don't actually correct the underlying problem.

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Case study: Elevator Trips Emergency Generator Breaker

A large commercial building had just finished an elevator equipment upgrade - but they hadn't been able to bring the elevator back into normal operation.

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Case study: The Vibrating Transformer

This case history comes from an electrical contractor. Several of this contractor's clients operate large commercial buildings.

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Case study: Rural Transformer Failure

This case history involves the investigation of a utility transformer failure that occurred in a rural area surrounded mostly by farmland and open space. The failure occurred in a location where power quality problems are rare.

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Case study: 5th Harmonic Resonance

A small city gets its water from a mountain lake 30 miles away. A pumping system at the lake brings water up a short incline and into a long gravity pipeline that feeds the city's water distribution system.

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Case study: Malfunctioning Traffic Light

The engineer carries a Fluke 43B on all trouble calls, because it provides a graphical display that allows customers to see a picture of the problem.

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Case study: Lighting Ballast Evaluation

In most facilities, lighting is a major element of operating cost. Part of that cost is due to energy, and part is due to maintenance.

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Case study: The Malfunctioning Medical Machine

This case history is a classic example of the importance of a systematic approach to solving a problem. It involves a contractor who works with several high-technology manufacturing plants.

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Case study: Half Wave Rectifier

One winter morning, the electrician received a call from a local school. The caller said a transformer supplying power to three portable classrooms was making a chattering noise, as if something were loose inside.

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4 ways maintenance teams benefit from remote power monitoring

Ensure that your team has the tools it needs to reduce unnecessary repairs and increase uptime by integrating power monitoring sensors into your maintenance program.

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Power monitoring improves real-world maintenance programs

Three organizations found cost and time savings after implementing the Fluke 3540 FC Three-Phase Power Monitor into their maintenance programs.

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Case study: Remote power monitoring helps prevent football power failures

Filmwerks International is one company that has implemented a better way to monitor utility power for their backup UPS systems and generators

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Make better energy consumption decisions

The Fluke 1738 Advanced Three-Phase Power Logger automatically captures and logs more than 500 power quality parameters to give electricians and technicians more visibility into the data needed to make better power quality and energy consumption decisions.

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Top 5 power quality issues you can solve with the Fluke 1770 power quality analyzers

Troubleshooting the most common power quality problems—voltage distortion and harmonics. Tools needed, types of problems

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Electrical Panel Overheating for No Apparent Reason?

Troubleshooting an electrical panel overheating problem from unusual causes; testing with the power on, ruling out harmonics—and the resolution.

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Case study: Texas power consultant keeps uninterruptible power supplies up and running

Critical systems run smoothly with regular maintenance and reliable tools Everybody knows that consistent, dependable electrical power is critical to any plant's function. But perhaps even more critical is a reliable uninterruptible power supply (UPS) system. UPS systems are the silent partners that just sit and wait until there's a break in power. At that point, the UPS system is the most important system in the plant. It has to be ready to spring into action in milliseconds to keeps things running for anywhere from seconds to hours.

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Reliable backup power

Since information technology (IT) installations are particularly sensitive to power supply fluctuations and distortions, they typically rely on an uninterruptible power supply (UPS) to compensate. Some installations even include a second UPS supplied by a separate feeder, and a standby generator that can be set to start automatically three minutes after detecting a power interruption.

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Power Reliability for Facility Managers

Power reliability for facility managers (bottom line): top issues; adds, moves, changes; electrical and electronic loads; emergency power; older facilities

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Troubleshooting power factor correction capacitors

Power factor correction capacitors reduce energy costs by avoiding the premium rates that utilities charge when power factor falls below specified values.

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Seven steps to mitigate VFD harmonic issues

To determine the best solution for mitigating unwanted harmonics, start by investigating the equipment suspected of producing the bulk of the harmonic currents. Most often these are Variable Frequency Drives (VFD's). Use measuring equipment to measure and analyze the frequencies and amplitudes of the harmonics. This is much simpler than it sounds.

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Practical applications for single-phase voltage recording

Voltage stability may be a problem in areas where loads are cycling on and off during the day. Large compressors, motors, welding machines, arc furnaces, power factor correction capacitors and other large electrical machinery along with system impedance can easily cause voltage dips, swells, and transients.

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Moving up to three-phase power quality measurements

Monitoring three-phase power quality is a must. Whether you troubleshoot mysterious electrical problems or provide additional services to a client, it is three-phase power that is provided to commercial and industrial customers and three-phase power that is distributed throughout a facility.

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Case study: A hospital tech develops his power quality knowledge

Downtime is costly, both in terms of patient wellbeing and monetary costs - the X-Ray, mammography, and other systems themselves cost millions and a failure can also idle technicians or surgical teams. Most of the facilities have motor/generators and can maintain operations independent of the utility, making the power system robust but also complex.

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Determining Load Horsepower, Wiring, and Breaker Size for Safe and Efficient Installations

“Let's just oversize the motor and we can run it lightly loaded—that will save us some money and be easier on the motor.” This is a false belief among some who select and install motors. Properly sizing motors for a given load results in driving loads more efficiently, saving energy, and saving dollars. Motors typically are most efficient when they are 90 % to 95 % loaded. Just because a motor says “25 Hp” on the nameplate does not mean the motor is producing twenty-five horsepower as it operates.Clamp meter readings: Problems and Solutions

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Finding energy waste with Power Quality management

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Why clean power is critical to smooth operations

When optimizing productivity in industry, energy use is one of the few inputs you can readily control.