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REO Leakage transformerThe 2-in-1 solution
In railway applications, where it‘s about the greatest possible comfort and safety of passengers, components are required that save space, are safe and have a long service life. Supply interruptions or voltage drops can lead to a range of undesirable effects such as the loss of motor power.
The REO leakage transformer ensures harmonized current and voltage outputs, filtering harmonics, and limiting the ripple current.With the spatial separation of the primary and secondary windings and the resulting intentional increase in the
magnetic leakage field, the REO leakage transformer achieves a loose magnetic coupling. This results in the combination of the function of a transformer (transforming voltage with galvanic separation) and a current-limiting choke.
Construction: The primary winding covers both iron cores; the secondary winding only the non-gapped transformer core. The leakage inductance is defined such that in combination with a downstream capaci-tor, this forms a low-pass filter for attenuating the pulse-frequency current and voltage components.
To illustrate the action of a leakage transformer the input and output currents and voltages for different frequencies were displayed on an oscilloscope. Comparing the different measurements, it can be seen that the currents and voltages at the output of the leakage transformer are more „harmonious“, i.e. from the interaction of the leakage inductance and the capacitor bank, an LC filter results that filters out
REO Leakage transformerThe 2-in-1 solution
Features:
Ambient temperature in normal operation -40°C bis +65°C
Ambient temperature in storage and transport -40°C bis +85°C
Ambient temperature when upgraded -40°C bis +70°C
Pollution degree as in EN 50124-1 PD4
Max. coolant entry temperature max. 5 kV/µs
Coolant flow rate AF, 65°C, min. 0,4l/s at rated power
Altitude (max. operating altitude above mean sea level)
≤1000m
Environment EN 50125-1
Classification IEC 721-3-5
Climate class 5K5 as in EN 60721-3-5
Biologically active substances; termite-resistant! 5B2 as in EN 60721-3-5
Chemically active substances 5C3 as in EN 60721-3-5
Mechanically active substances 5S2 as in EN 60721-3-5
Contaminants 5F2 as in EN 60721-3-5
Advantages of the REO leakage transformer:- Space-saving (transformer and choke in a single component)- longer life for motors from limiting of current peaks- low-cost- combined with capacitors it can be used as a sine-wave filter
Comparison at 2 kHz:
Input
Comparison at 2 kHz:
Input
CH1 = U(U1)CH2 = U(U1-W1) CH3 = I(U1) (100mV=10A,20A/Div)CH4 = I(W1) (100mV=10A,20A/Div)
CH1 = U(U1)CH2 = U(U1-W1) CH3 = I(U1) (100mV=10A,20A/Div)CH4 = I(W1) (100mV=10A,20A/Div)
CH1 = U(U2)CH2 = U(U2-W2) CH3 = I(U2) (100mV=10A,20A/Div)CH4 = I(W2) (100mV=10A,20A/Div)
CH1 = U(U2)CH2 = U(U2-W2) CH3 = I(U2) (100mV=10A,20A/Div)CH4 = I(W2) (100mV=10A,20A/Div)
Output
Output
Technical data:
Rated power 170 kVA
Vector group Dy5
Ratio 2.67 (Upri/Usec)
Primary voltage 3x1175 Veff 60 Hz (PWM 900 Hz)
Rate of voltage rise dv / dt max. 5 kV/µs
Harmonic current 15 Aeff @ PWM 900 Hz
Secondary voltage 3x440 Veff
Current 3x220 Veff (S1)
Copper losses 6 kW (@ 100°C)
Iron losses 0.9 kW
Relative short-circuit voltage uk = 32 %
Leakage inductance Prim.: 21 mH -0% +30%
Insulator class H
Temperature monitoring 3 x Temperature switch 180°C
Test voltage- Primary to ground - Secondary to ground - Partial discharge, Primary to ground
11.2 kV / 50 Hz / 60 sec2.5 kV / 50 Hz / 60 sec< 50pC @ 5600 V
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![arXiv:1807.00225v1 [physics.app-ph] 30 Jun 2018SOI allows full dielectric isolation between neighboring devices, reduced leakage currents and reduced capaci-tive coupling, full depletion](https://img.pdfslide.net/doc/110x75/5e83fabfbdfcbc24627e581d/arxiv180700225v1-30-jun-2018-soi-allows-full-dielectric-isolation-between.jpg)
