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CleanWave |
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Zero sequence harmonic filters
Harmonics are an ever-present safety risk and can disturb the operation of equipment
Non-linear loads, such as computers, safety lighting, fluorescent lighting, etc, are becoming ever more present and create high levels of harmonic current which can be added-up to the neutral, creating ever serious problems:
Overheating in cabling and electrical distribution equipment
Degradation of the power supply causing critical equipment to malfunction
Increased power consumption
Improved safety and reliability
CleanWave® eliminates neutral current and zero sequence harmonics.
Improves the safety of the electrical installation
Improves the power quality of the supply to the equipment
Removes the need for oversized electrical installations |
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Standards
The standards relating to harmonic currents are being tightened up.
New French standard NFC15-100
IEC 61000-3-2 Limits for harmonic current emissions, equipment ≤16A
IEC 61000-3-4 Limits for harmonic current emissions, equipment >16A
G5/4 Recommendations for the limit of harmonics
IEEE 519 [2]
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Sinewave |
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Active harmonics conditioners from 20 to 480 Amps
Invisible, costly pollution
Nonlinear loads absorb currents.
All currents are made up of:
the basic sinusoidal current (50 Hz, for example) called the fundamental (F),
sinusoidal "polluting" currents which are multiples of F (2F, 3F, 4F, 5F, ... nF ) called harmonics.
These harmonics are increasingly polluting the voltages used by production facilities, pumping stations, data processing systems, telecommunication switchboards, TV studios, etc. and consume a significant proportion of available current.
This gives power users three types of problem: |
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Impact on the electrical installation with significant overheating in alternators, transformers, capacitors and cables ...
The hidden costs of accelerated ageing in this type of equipment can be extremely high.
Impact on utilisation of equipment with unexplained power outages and malfunctions in equipment sensitive to power quality. These failures cost money and reduce the effect of capital investment - with a negative effect on the bottom line!
Impact on available electrical power as the current consumed by harmonics is totally lost and can cause up to 30% over-consumption. Utility bills soar even though there is less power available.
Existing standards
Three sets of standards designed to reduce the spread of harmonic pollution now apply.
These are:
Standards for equipment
IEC 1000-3-2 or EN 61000-3-2 for low voltage appliances absorbing currents of under 16 A,
IEC 1000-3-4 or EN 61000-3-4 for low voltage appliances or installations absorbing currents exceeding 16 A.
Standards for mains supply quality
EN 50160 defines the voltages supplied by utility low voltage networks,
EEEI 519 (Recommended Practices for Harmonics Control in Electrical Power Systems) is a joint recommendation by utility operators and subscribers to limit the impact of non-linear loads through a joint effort to reduce harmonics.
Compatibility standards between electrical networks and products
IEC 1000-2-2 and recommendations by CIGRE (Conférence Internationale des Grands Réseaux Electriques) for public low voltage networks,
IEC 1000-2-4 for industrial installations using low and medium voltage. Utilities actively encourage preventive actions to reduce electricity quality depreciations and overheating, and to increase the power factor.
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Total Harmonic Management |
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The complement dedicated to the Galaxy and Galaxy PW range
Elimination of UPS harmonic disturbances
-reduced THDI
-increased power factor
-increased cos phi
-operating cost savings
Compliance with IEC61000-3-4standard
Flexible and modular
Complete compatibility between UPSs and engine generator sets
Constant level of performance even at low UPS loads
Active Twelve Pulse Technology |
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Elimination of UPS harmonic disturbances
Reduced THDI
The THDI value indicates the level of harmonic currents upstream of UPSs. THM offer better performance than all other harmonic-suppression techniques.
Increased power factor (PF) and cos phi
THM can be set to improve the cos phi value.
The power quality obtained ensures optimum operation of theentire power supply system. |
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Operating cost savings
Power consumption (kVA) may be
reduced by up to 20%.This reduction
makes it possible to:
-reduce the size of engine generator
sets and cables;
-enhance the operating reliability of
circuit breakers;
-reduce losses. |
Constant level of performance even at low UPS loads
THM provides a virtually constant level of performance, whatever the percent load on the UPS.
With this significant reduction in harmonics, it is possible to implement all system architectures, in particular parallel-connected configurations. In such configurations where the UPS does not supply its total capacity,THM maintains high level of performance, contrary to the double bridge technique.
Complete compatibility between the UPS and an engine generator set
An engine generator set installed upstream of the UPS is often the first equipment to suffer from harmonic disturbances. Due to its capacity to eliminate harmonics even at low percent loads,THM ensures optimum operation of engine generator sets.
Flexible and modular
Associated with group of UPSs, THM reduces the footprint compared to traditional solutions.
Compliance with IEC standards
THM complies with the specifications of IEC guide 61000-3-4. Its performance exceeds requirements and even anticipates on the requirements of future standards. |
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