Standard Handbook for Electrical EngineersArcher Eben Knowlton |
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Page 235
... thermal and electrical con- ductivities at a given temperature is independent of the nature of the conductor , holds closely for copper . The ratio K / XT , where K = thermal conductivity , λ = electrical conductivity , T = absolute ...
... thermal and electrical con- ductivities at a given temperature is independent of the nature of the conductor , holds closely for copper . The ratio K / XT , where K = thermal conductivity , λ = electrical conductivity , T = absolute ...
Page 569
... THERMAL CHARACTERISTICS1 63. Thermal characteristics of transformers involve ( 1 ) dissipation of the heat resulting from the iron and copper losses ; ( 2 ) variation of the kva with temperature rise under steady load conditions ; ( 3 ) ...
... THERMAL CHARACTERISTICS1 63. Thermal characteristics of transformers involve ( 1 ) dissipation of the heat resulting from the iron and copper losses ; ( 2 ) variation of the kva with temperature rise under steady load conditions ; ( 3 ) ...
Page 1714
... thermal relay C - Time for economical size wire to reach maximum allowable temperature -D - Tripping time for fuse of 3 times motor rating 200 0 0 10 20 ΤΑ 30 40 50 60 Time , sec FIG . 17-97 .-- Characteristic of thermal overload relays ...
... thermal relay C - Time for economical size wire to reach maximum allowable temperature -D - Tripping time for fuse of 3 times motor rating 200 0 0 10 20 ΤΑ 30 40 50 60 Time , sec FIG . 17-97 .-- Characteristic of thermal overload relays ...
Contents
Units and Conversion Factors | 1 |
Alternatingcurrent Generators and Motors | 7 |
Power Transmission | 13 |
Copyright | |
32 other sections not shown
Common terms and phrases
air gap alloys alternating current aluminum Amer ammeter amperes applied approximately armature ASTM autotransformer cable calculated capacitance capacitor carbon characteristics coefficient coil conductor connected cooling copper core curve density designed diameter dielectric constant dielectric strength effect Elec electrical electrodes electromagnet Engrs field flux frequency galvanometer Grade heat hysteresis impedance increase Inst instrument insulation iron Jour leakage load loss machine magnetic circuit material maximum measured mechanical metal meter method mica moisture normal obtained ohms operating phase angle pole potential potentiometer power factor primary properties range rated ratio reactance relay resistance resistor rheostat rotor secondary shown in Fig shunt silicon slots speed standard stator steel stranded stress surface synchronous Table temperature rise tensile strength thermal three-phase tion torque Trans tube unit usually varnish voltage voltmeter volts wattmeter watts wave winding wire