Handbook of Electrical Engineering

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 205 Table 9.20. Land based Installations. 6350/11,000 V. Cu/XLPE/PVC/AWA/PVC sin- ...

206 HANDBOOK OF ELECTRICAL ENGINEERING A typical value of 2.5 km/W is used for dry desert locations, which would cause the cable ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 207 The secondary cable runs on its own cable rack to a switchboard. Both cable r ...

208 HANDBOOK OF ELECTRICAL ENGINEERING Table 9.22. Land based Installations. 3800/6600 V. 6350/11,000 V. 8700/15,000 V. Cu/XLPE/ ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 209 Table 9.24. Marine and offshore 600/1000 V. Cu/EPR/CSP/GSWB or PBWB/CSP or PV ...

210 HANDBOOK OF ELECTRICAL ENGINEERING Large or complete voltage depressions occur as a result of short circuits at or near the ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 211 EF=IX sin Ø DF=IX cos Ø AC=AB+BC=AB+EF=IR cos Ø+IX sin Ø (9.1) DC=DF−CF=DF−BE ...

212 HANDBOOK OF ELECTRICAL ENGINEERING The motor. The starting current is:- I= 6. 5 × 180. 0 = 1170 .0amps The power factor is:- ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 213 9.4.3.2 Volt-drop in long cables Let the series resistance beRohms, the serie ...

214 HANDBOOK OF ELECTRICAL ENGINEERING is 33,700 V. The specific resistancer, inductive reactancexland capacitancecare 0.100 ohm ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 215 The solution sequence. i) Calculate the total impedance seen by the sending e ...

216 HANDBOOK OF ELECTRICAL ENGINEERING iii) Hence the voltage across the capacitance is, Vc=Vs−Vsc = 19456. 7 +j 0. 0 − 508. 35 ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 217 b) The ‘Pye’ equivalent circuit. The single series element is, R+jX 1 = 2. 50 ...

218 HANDBOOK OF ELECTRICAL ENGINEERING The charging current at the sending endIcsis, Ics= Vs 2 Xc = 19456. 7 −j 1061. 04 =+j 18 ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 219 And from Figure 9.1, AB= 349. 91 × 2. 50 × 0. 9500 = 831. 04 BE= 349. 91 × 2. ...

220 HANDBOOK OF ELECTRICAL ENGINEERING By comparing the four methods it can be seen that the results in order of pessimism are:- ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 221 9.4.3.3.1 Worked example A 132 kW induction motor is connected to a 415 V 3-p ...

222 HANDBOOK OF ELECTRICAL ENGINEERING 9.4.3.4 Cable-sizing tables It is common practice to prepare cable-sizing tables for low ...

CABLES, WIRES AND CABLE INSTALLATION PRACTICES 223 Table 9.25. Cable-sizing chart for DOL induction motors Cable information EPR ...

224 HANDBOOK OF ELECTRICAL ENGINEERING giving the form of equation found in the reference literature, Isc= AK √ t amps (9.7) Or ...