Reducing fluctuations in the supply network during welding. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Reducing fluctuations in the supply network during welding. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / welding equipment

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Household welding transformers with a power of 2,2-3,3 kW, made independently, during welding, cause a decrease in the mains voltage at a load of several volts (the network "sits down"). This leads to the dimming of the lighting lamps and affects the operation of the radio equipment, which causes criticism from the neighbors, whose houses are supplied with voltage through one line.

It is possible to reduce fluctuations in the mains voltage using a capacitor connected to the primary winding of the welding transformer (Fig. 1), the capacitance of which depends on the power of the welding transformer.

Reducing fluctuations in the supply network during welding

When choosing the value of the capacitance of the capacitor, it is necessary to use the graph shown in Fig. 2.

Reducing fluctuations in the supply network during welding

If you change the value of capacitance, the current of the primary winding of the transformer changes. This current has a minimum value at a certain capacitance of the capacitor C1 (the case of parallel resonance of the primary winding I and the capacitance of the capacitor C1).

Curve 1 corresponds to the no-load current, and curve 2 to welding. When welding, the consumed current increases, which at the same mains voltage and a constant frequency indicates a decrease in the inductance of the primary winding. Curve 2 is more flat - the quality factor of the circuit is the smaller, the lower the inductance. Point "a" of the intersection of the two current curves gives the optimal capacitance value. The current consumed from the network during welding will be almost equal to the current at the break of the welding arc. The practically optimal capacitance is determined as follows: a capacitance is connected to the primary winding and the current in the common circuit is measured. If the current consumption increases when the arc is ignited, then the capacitance should be increased.

With an accurate selection of capacitance, it is possible to achieve a constant current consumption with a welding arc and its absence. Capacitors should be used of the type MBGO, MBGV, K75-11 for an operating voltage of at least 600 V at a mains voltage of 220 V. The capacitance value is about 50-100 microfarads (depending on the power of the welding transformer).

Author: V.F. Yakovlev

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