Claude Lyons Power Quality Management

Why is power quality management so important?

Electrical power is the lifeblood of the modern world.  It is a precious resource which requires careful management; without it our IT systems would fail and we would be lost in the stone age.

The rapid development of the world’s economies and the expansion of commercial centres has led to an unprecedented demand on the system. New power stations are being commissioned at an alarming rate in order to keep up with demand, and yet power quality has never been subject to so many threats.

The problems are largely related to traditional mains borne disturbances, such as spikes, surges, brownouts and power cuts. However, to add to the situation a new phenomenon has emerged in recent years: ever increasing harmonic distortions.

Modern office buildings are filling up with sophisticated electrical and electronic equipment, much of which draws harmonic currents from its power supplies. These harmonic currents and the harmonic voltage distortion that they cause, can lead to unsafe and unreliable electrical power supplies. Operational difficulties are infrequent, but they can cause considerable disruption to the majority of organisations that rely on communications, process control or information technology.

Most large organisations are aware of the consequences to their business if power quality is not corrected and are taking measures to resolve this. Many have sought advice from power quality specialists such as TEC and Claude Lyons.

How can Claude Lyons help?

Claude Lyons are able to provide a complete service from start to finish, including site surveys, recommendations and solutions based on current and future needs, commissioning, installation, maintenance and service agreements backed up by their own fully qualified engineering teams.

The recommendations may not be as complicated as might be expected; in some cases the installation of conditioning and harmonic tolerant products such as PurePower UPS systems is all that is required and sometimes simple harmonic cancellation equipment will reduce the problems to an acceptable level, where as in other cases total correction, involving full conditioning and some form of active harmonic intervention will be necessary.

Remember – the problem of harmonics is not going to go away, the generating companies although sympathetic now will be forced to impose penalties in the future. Specifications such as G5/3, IEEE 519 and EN 6100-3-2 mean that these problems simply cannot be ignored. The solutions although not easily recognised are available and the Claude Lyons are here to guide you through the solutions available – contact us.

Transients Random equipment failures
Computer data errors
Peak Hold
Rise Time
Pulse Duration
Load switching
Surge Arrestors
Ultra Isolation Transformers
Line Voltage Conditioners
Sags / Surges
Slow > 100ms
Computer data errors
Power supply failures
Peak / Trough Hold
Pulse Duration
Load switching
Motor starting
Bullet Voltage Stabilisers
Ferroresonant Transformers
Fast < 30ms
Lighting flicker
Computer data loss
Random equipment reset / errors
Peak / Trough Hold
Pulse Hold
Load switching
Fuse clearing
Arc furnaces
Electronic Voltage Stabilisers
Ferroresonant Transformers
Mains Voltage Compensators
Line Voltage Conditioners
Under / Over
Torque reduction
Motor overheating
Motor burnout
Circuit breaker tripping
Power supply failure
RMS vs Time
Peak / RMS
Industrial sites
System overload
Load shedding
Tap changing
K-Factor Transformers
Ferroresonant Transformers
Mains Voltage CompensatorsVoltage Stabilisers
Voltage Flicker Lighting problems / flicker
Transformer noise
Bullet monitor screen wobble
Flicker Meter- Magnitude/Frequency Modulation Frequency Tap changing
Load switching
Load variations
Electronic Voltage Stabilisers
Ferroresonant Transformers
Harmonic Current Distortion 3 Phase Neutral cables overheating / fires
Transformer burn outs
High neutral to ground voltages/circulating currents
THD Spectrum Analysis (3 Wire / 4 Wire ) Non linear loads
Variable speed drives
System resonance
K-Factor Transformers
Passive Filters
Active Harmonic Conditioners
Harmonic Current Distortion Single Phase Transformer overheating / fires
Monitor screen wobble
THD Spectrum Analysis Non linear loads
Variable speed drives
Passive Filters Series/Parallel
Ferroresonant Transformers
Active Harmonic Conditioners
Harmonic Voltage Distortion Random equipment resets / crashes
Clock problems
Synchronising problem due to to multiple zero crossings
THD Spectrum Analysis




High levels of non linear current
Variable drives
System resonance
High impedance
Electronic Voltage Stabilisers (Waveform correction option)
Active Harmonic Conditioners
Interruptions and Power Failure Black outs
Data loss
Production line down time
Duration against time Fuse fault clearing
Load shedding
Auto reclosers
Uninterruptible Power Supply
Back up generator (local)
Bad Power Factor High maximum demand
Over sizes supply
Motor loads
Lighting systems
Power Factor Correction
Capacitor Banks fixed/auto