Electrical Installations and Regulations by J. F. Whitfield and N. Hiller (Auth.)

By J. F. Whitfield and N. Hiller (Auth.)

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Example text

The contacts may be opened manually, so that the unit operates in effect as a main switch, but in addition they will open automatically in the event of an overload. This automatic operation is carried out by one or both of two methods. (1) Thermal tripping. A bimetal strip is made up of two pieces of metal with widely differing temperature coefficients of expansion. They are riveted or welded together along their length to form the strip. One metal expands more than the other as the temperature increases, so that the strip bends.

Iy/ <»> (b> FIG. 10. The solenoid, (a) Magnetic field due to a solenoid. (ò)TheN-Srule. The polarity of a solenoid can be found by the N-S rule which uses the current direction when viewed from either end of the coil. This is easily remembered by the use of arrows on the letters N and S as shown in Fig. 10(6). Magneticfieldstrength No attempt will be made here to consider magnetic calculations. It is, however, necessary to appreciate that: (1) A larger current in a solenoid increases the strength of the magnetic field set up.

This means that the magnetic field associated with the solenoid induces an electromotive force into the coil itself which opposes the applied voltage, and causes the current wave to lag behind the voltage wave by 90°. 15(ò) shows the circuit, wave, and vector diagrams for a coil assumed to have no resistance. The coil has no resistance, but does have inductive reactance (XL), where XL = 2TT/L XL is inductive reactance in ohms, / is frequency in c/s, L is inductance in henrys. The henry (symbol H) is the unit of self-inductance.

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