Various wound products

We are specialized in winding of components using other than standard cores. For air-core coils we use self-adhesive wire and apply the latest in winding-machine technology. The smallest wire size is 0.04 mm. High-power wound components are made of copper foil, copper sheet, copper rod or profile wire.

Toroidal transformers

From the very beginning of Trafox history transformers, chokes and various wound components constituted the main part of our production. The production of toroidal transformers started in Joensuu 1975 and production of toroidal cores in Helsinki 1982. Features low weight, small size   low profile easy mounting   low magnetic stray field low noise level   standard EN 60742 (new coming standard EN 61558-2-6)   temperature class E (F and H on request) UL-recognised materials on request

Quality Quality assurance according to EN ISO 9001   Long-time manufacturing experience (since 1975)   High-grade materials

Ferrite Components

Encapsulated transformers

KKM transformers are made of toroidal transformers (except the size of 50 VA). This is why they are space saving and very silent. Transformers are used as safety isolating transformers and isolating transformers. 12 V transformers are used for halogen lamps. Transformers are manufactured according the EN60742 standard and they have FIMKO, SEMKO and NEMKO approval. The enclosure is made of Euro-grey plastic. Thanks to the beautiful design they can be installed to a visible place. According to the structure, transformers can be either stationary or semi-stationary mounted. Mounting screws (wood or other soft material) of the enclosure are included in delivery.

DC power supplies

Power supplies have generally among other things following features: Meet the requirements for standards EN60742, EN61558-2-6 and EN61000-3-2 The units have safety isolating transformers manufactured by Muuntosähkö Oy-Trafox Necessary semiconductor- and filter components are made by well- known manufacturers The units are planned for industrial use that is why they are from construction simple and reliable and with sufficient allowance in the dimensioning Several models both encapsulated and with open construction In addition to standard models we manufacture DC- power supplies also according customer made ones

Power transformers and reactor

Trafox has concentrated in designing and manufacturing of low voltage power transformers and reactors. Power transformers and reactors are made on request according customer’s specifications and desired standards. High frequency line reactors are used to attenuate Harmonic distortion and interference spikes coming from the Electrical System or from the load, as well as to limit starting current rushes.

SINGLE AND THREE PHASE
AC AND DC CHOKES, REACTORS

General specifications of the chokes

The choke types are iron core or air core. The benefits of the iron core chokes are small dimensions and low magnetic stray field.

The basic design equals the design of single and three phase transformers. Common choke types and applications are:

• Suppression reactors for direct current
• Serial and commutation chokes
• Filtering chokes, band-rejection chokes and suppression chokes for harmonics
• Chokes for generation of reactive power

If other types are required, please contact our technical sales department.

The following information is essential for design:

• Inductance
• Frequency
• RMS value of the current (instantaneous RMS value peaks)
• Voltage level
• AC or DC choke. If DC, the value and frequency of the AC component are needed

Chokes and Reactors

Air Core Reactors	Harmonic Circuit Filter Reactors

LINE REACTORS

Features of Trafox reactors

High quality materials:

• Core made of grain-oriented cold rolled electrical steel.
• Windings made of double enamelled copper wire,
  temperature class H/180°C.
• Winding supports made of reinforced polyester,
  temperature class F/155°C.
• Insulation made of polyester foil, temperature class F/155°C
  or Nomex 410 aramid paper, temperature class C/220°C.
• Standard dip varnish coating, or vacuum
  and pressure impregnation (VPI) available.
• Safe construction; low combustion capacity.

High frequency line reactors are used to attenuate Harmonic distortion and interference spikes coming from the Electrical System or from the load, as well as to limit starting current rushes.

Line Reactor: - Decreases current rushes - Decreases noise and temperature of the motor - Extends the lifetime of semiconductors	Line Reactor: - Suppresses interferences and transients coming from the electrical system - Attenuates the harmonics - Decreases inrush currents - Extends the lifetime of semiconductors	Line Reactor: - Suppresses interferences coming from the electrical system or lead - Attenuates the harmonics - Decreases inrush currents

Rated Voltage	3 x 400V
Voltage drop/phase	9,2V (4%)
Test voltage	5000V
Frequency	0-60 Hz
Rated current	Acc. to table
Degree of protection	IP 00
Ambient temperature	+45°C
Standards	IEC 61558-2-20

On request other voltages and currents (max. current 1000A) available.

HARMONIC CIRCUIT FILTER REACTORS

Power Quality disturbances and Harmonic distortion are today`s problems in Electrical Systems. The harmonic distortion and High Frequency interferences are caused by variable speed drives, soft starters, rectifiers, welding devices, UPS, discharge lamps etc… These disturbances may further affect sensitive loads connected to the same power source. Harmonic voltage distortion also causes several other problems: motor damages, over-heating of cables and transformers etc…

The reactor minimizes harmonic current through the capacitor bank and reduces losses in the capacitors. With the reactor the operation lifetime of capacitors will be increased. Harmonic Filters are used to eliminate Harmonics and High Frequency disturbances. The attenuation of a filter unit depends on Harmonic Frequency and network properties. The filter unit will provide some power factor correction at the 50 Hz line frequency. Filter reactors and capacitors are tuned to frequency close to the harmonic frequency. The most common resonance frequency is 189 Hz and the filtering factor 7%.

Technical data of standard types

Reactors with different values are available upon order. Enclosures upon order.

Download the brochures here:
 

Detuned reactors, 400V series

Detuned reactors, 400V 134Hz 14%

Detuned reactors, 415V series

Medical isolation transformers

Medical isolation transformers are designed with reinforced isolation and they have very low leakage current between input and output circuits. When measured in no load condition and the transformer supplied at rated voltage and rated frequency, the leakage current does not exceed 0,5mA. Between input and output windings there is a static shield.   The transformers are designed to meet standards IEC 61558-2-15, IEC 60742, EN 60601-1, EN 60742 and EN 61558-2-15.   In a transformer supplying medical locations the isolation of the output circuit has to be monitored by Line Isolation Monitoring system (LIM). Option: Monitoring of over current and temperature with thermal sensor and protection relay.   Models: Line isolation monitoring (LIM) Residual current monitoring (RCM)

Ground fault monitoring Superintend®

MAXIMUM ELECTRICAL SAFETY WITH SUPERINTEND® Superintend® is the solution when highest possible electrical integrity is required. Superintend® continuously monitors the entire electrical system recording all fault current fluctuations and fault current levels. This is a new ON-LINE technique to monitor the condition of critical Electrical system. Some of the benefits Superintend ON-LINE Monitoring System offers are:   Better fire and person safety Predictable insulation faults Improved Power Quality Increased electrical reliability Ensures liabilities when installing or maintaining Electrical system

• Trafox Filters

• Du/dt series
• Sine series