multiwave active harmonic filter

multiwave active

multiwave active significantly increases operational safety

The loads in industrial networks are increasingly dominated by a large number of small and large converters. In this context, two effects can be observed. Due to the falling number of motors operated directly on the grid, the need for inductive fundamental reactive power is decreasing. At the same time, harmonic currents are increased. The impedance of the network transformer plays a decisive role. A large part of the harmonic voltage is created here, leading to faults in all consumers. This results in unreliable operation of the devices and an increased number of malfunctions.

KBR offers active harmonics filters as a solution. The multiwave active eliminates harmonics up to the 50th harmonic. The filter improves voltage quality, significantly increasing operational safety.

The benefits are astonishing. It is almost impossible to put into figures what can be saved through reduced equipment wear, fewer error corrections, or even production stoppages that are prevented before they happen. Studies show that billions are lost every year as a result of polluted energy networks.
multiwave active is therefore an investment in internal operational safety.

A filter system should be designed for the individual use case. Our “Power Quality Service” department is specialized in this task and happy to assist you with your project.


  • Harmonic compensation up to the 50th harmonic
  • Easy expansion thanks to modular system
  • Current- or voltage-regulated control
  • Automatically adapts to changing conditions in operation
  • Reactive power compensation, phase-selective, inductive, and capacitive
  • Load balancing, compensation for phase shifts
  • Robust, reliably, and with higher temperature range up to 50°C without derating
  • Harmonic filtering, selective in percentage or limits from the standard

multiwave active

The right product for every requirement

Even the smallest version of multiwave active ensures safe compensation of harmonics up to the 50th harmonic as well as reactive power. Small dimensions and low weight allow easy and space-saving installation in any environment: both wall and control cabinet mounting up to protection class IP54 are possible. With a power dissipation of only < 970 W, this design is extremely economical. The response time of << 1ms also makes it possible to optimally compensate for dynamic loads.

Mechanical design
  Module Wall cabinet Free standing cabinet LCD-Display

multiwave active 60 A (3-/4-wire)

1 Yes Yes Yes
multiwave active 120 A (3-/4-wire) 2 Yes Yes Yes
multiwave active 180 A (3-/4-wire) 3 Yes Yes
multiwave active 240 A (3-/4-wire) 4 Yes Yes
multiwave active 300 A (3-/4-wire) 5 Yes Yes


The benefits

As an active harmonic filter of the latest generation, it offers many advantages over conventional technology. multiwave active is powerful, compact, operates fully digitally, reacts below less than 1 ms and reliably compensates current harmonics and reactive power. Due to the always built-in LCD display, the user always has an overview of the filter's function.

Compact models for every requirement
Active resonance damping, dynamic power factor correction ind/kap (phase-selective), load balancing, flicker compensation / symmetrical voltage stabilization, neutral conductor unloading. With its extensive range of models, multiwave Active is suitable for a wide variety of applications. For example, the device versions range from 60 to 300 amps and 380 to 480 volts - and that in 3- or 4-wire technology.

Fast compensation in near real time
The faster an active harmonic filter reacts to disturbances in the network, the more precisely it compensates for them. Since multiwave Active operates fully digitally, a response time of less than 1 ms is possible.

Low power dissipation
By using 3 level IGBT with reduced losses, the active filters worked very efficiently.

High performance in a small space
Compared to other active filters, multiwave Active requires very little space. In its 60-amp version, for example, the unit has external dimensions of just 44 x 42 x 22 cm and weighs only 44 kg. This makes wall mounting possible without any problems.

The areas of application

The range of companies and institutions that can clearly optimize their network quality with multiwave active is wide. Thus, an efficient use of the active harmonic filter is just as suitable in building technology as, for example, in plant and automation technology. It makes sense to include the device in the planning and implementation of new systems. Of course, multiwave active can also be intelligently integrated into existing systems and equipment where power quality problems occur.

The operating comfort

Click-and-start configuration
The flexibility of multiwave active is demonstrated by the fact that it can be coupled to the power grid on the load or grid side via a variety of current transformers or voltage-controlled. Configured with just a few clicks on the LCD display, the current in the grid is continuously measured and any harmonics or phase shifts that occur are actively compensated. Within microseconds, the multiwave active calculates the corresponding compensation currents, provides them and feeds them into the grid. A fully digitalized control and regulation system as well as a fast and high computer performance make this possible

Multilingual menu and control via software
By means of a multilingual, menu-driven control panel and display, commissioning, selection and setting of individual parameters are very user-friendly for all multiwave active device types. With the help of the software, installation and maintenance can also be carried out conveniently via PC. In remote operation via Ethernet and TCP/IP interface, the current status of the power quality can optionally be called up online so that adjustments can be made.

Technical data

General technical data
Rated voltage AC 400 V (max. 415 V) ±10%
Network frequency  50 / 60 Hz
Peak current 2x rated current
Cable connection 3-phase + PE + N/PEN, neutral conductor connection is required (Network configuration: TN)
Compensation 3-wire operation: External conductor, symmetrical and asymmetrical (positive and negative sequence network)
4-wire operation: also has neutral conductor (positive, negative, and zero sequence network)
Compensation 1st – 51st harmonic (50 Hz) // 1st – 41st harmonic (60 Hz) // 1st – 51st harmonic (50 Hz) // 1st – 41st Harmonic (60 Hz)
All harmonics can be filtered at the same time
Additional functions - Dynamic reactive power compensation
- Active and reactive power balancing (negative sequence network up to 60%, zero sequence network up to 30% rated current)
- Voltage stabilization through Q(U) control
- Flicker compensation
- Neutral conductor load reduction
Operating voltage AC 400 V
Power dissipation < 2.6% of compensation power maximum, < 2.6% of compensation power maximum, < 2.3% in typical operating, < 0.7% in idle speed, < 100 W in standby
Switching frequency 20 kHz (low-loss version)
Controls Internal control computer with two digital signal processors
Device setup and display Via internal web servers (TCP/IP) and PC, SD card, or Anybus interface (field bus interface)
Response time  << 1ms
Interfaces  - Ethernet (TCP/IP)
 - Various field bus systems via Optional Anybus plug-in module (e.g. Profinet, Modbus TCP)
 - 4x digital outputs: 250 VAC (3 A) / 110 VDC (0.7 A) / 24 VDC (1 A), potential and configurable
 - 4x digital inputs: 24 VDC (10 mA), configurable for remote control and easy additional parameter adjustment
Current transformers 3-phase current measurement, xx/5 A or xx/1 A (configurable)
The required current transformers are not included, 15 VA, class 1 or better recommended
Inverters 3-level IGBT with intermediate voltage circuit (electrolytic capacitors)
Ambient conditions

- Maximum ambient temperature without reduced performance: 40°C
- Recommended ambient temperature for continuous operation: < 25°C
- Minimum operating temperature: 0°C
- Relative humidity: maximum 95%
- Transport/storage: -20° C … 70 °C

Overvoltage category CAT III, 300 V
 EMC class Standard: EN 55011, class A1 (industrial environment), optional: Class B (residential area)
Standards EN 50178, EN 61439-1, EN 61439-2, EN 61-6-2, EN 61000-6-4, EN 55011



Wall- or standing cabinet

Technical data wall cabinet / free standing cabinet
Dimensions 800 x 600 x 1200 mm + 100 mm ceiling ventilation (WxDxH)     
External conductor rated currentr  60 A  120 A      
Rated current neutral conductor 180 A   360 A       
Weight 132 kg  176 kg      
Power dissipation during derating <1300 W  <2400 W      
Power dissipation under typical operating conditions <966 W  <1932 W      
Assembly Wall mounting or standing cabinet


Ambient temperature 0 ... 50°C at full power, up to 55°C without derating
Protection type IP 20 or optional IP 54 
Noise level < 56 to 63 db A (depending on the load situation)
Recommended fuse 200 A type gL or gG



Wall cabinet

Technical data wall cabinet
Dimensions 800 x 400 x 1200 mm (WxDxH)     
External conductor rated currentr  60 A        
Rated current neutral conductor 180 A         
Weight 114 kg        
Power dissipation during derating <1300 W        
Power dissipation under typical operating conditions <966 W        
Assembly Wall mounting


Ambient temperature 0 ... 50°C at full power, up to 55°C without derating
Protection type IP 20 or optional IP 54 
Noise level < 56 to 63 db A (depending on the load situation)
Recommended fuse 200 A type gL or gG


Standing cabinet

Zeichnung multiwave active Standschrank

Technical data free standing cabinet
Dimensions  800 x 600 x 2000 mm+ 2000 mm + 100 mm base + 100 mm ceiling ventilation (WxDxH)             
External conductor rated current  60 A  120 A  180 A  240 A  300 A
Rated current neutral conductor  180 A  360 A  540 A  720 A  900 A
Weight  225 kg  285 kg  345 kg  405 kg  465 kg
Power dissipation under typical operating conditions  < 966 W  < 1932 W  < 2898 W  < 3864 W  < 4830 W
Assembly  Free standing cabinet
Ambient temperature  0 ... 40 °C at full power, up to 50 °C without derating
Protection type

 IP 31 or optional IP 54   

Noise level  < 75 db A (depending on the load situation)
Recommended fuse  400 A type gL or gG


Power Quality Service

Troubleshooting and Solutions

Power Quality - Troubleshooting and Solutions

Your carefree package
Power Quality Maintenance Service

Your network quality in view.
We do it for you!

 Brochure PQ Maintenance Service

Components for reactive power compensation

KBR-Catalogue - Components for power compensation