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Inductance

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Inductance


In the table below the inductance of single-core unarmoured cables is calculated for the following laying conditions:

Ц being laid in trefoil: cables are laid tightly,
Ц being laid flat: the cables are laid at a distance of one cable diameter.


At other laying conditions the inductance shall be calculated according to the equation:




where;
h - distance between centres of conductors, mm;

r - radius of conductor, mm.

Nominal conductor cross-sectional area, mm2

Inductance, mH/km

Rated voltage, kV

6

10

15

20

30

35

flat

trefoil

flat

trefoil

flat

trefoil

flat

trefoil

flat

trefoil

flat

trefoil

35

0,604

0,448

0,620

0,465

0,637

0,485

0,652

0,501

---

---

---

---

50

0,578

0,421

0,594

0,437

0,611

0,456

0,625

0,472

0,657

0,506

0,669

0,518

70

0,552

0,391

0,567

0,407

0,583

0,426

0,597

0,441

0,628

0,474

0,639

0,486

95

0,533

0,370

0,547

0,386

0,563

0,403

0,576

0,418

0,606

0,451

0,617

0,462

120

0,508

0,342

0,521

0,357

0,536

0,373

0,549

0,387

0,577

0,419

0,587

0,430

150

0,497

0,329

0,509

0,343

0,524

0,359

0,536

0,373

0,563

0,404

0,573

0,415

185

0,482

0,312

0,494

0,325

0,508

0,341

0,519

0,354

0,545

0,384

0,555

0,395

240

0,469

0,296

0,479

0,308

0,492

0,323

0,503

0,336

0,528

0,365

0,537

0,375

300

0,461

0,286

0,468

0,294

0,480

0,309

0,490

0,321

0,514

0,349

0,523

0,359

400

0,451

0,275

0,455

0,280

0,467

0,294

0,477

0,305

0,500

0,332

0,508

0,342

500

0,440

0,261

0,442

0,264

0,453

0,277

0,462

0,288

0,484

0,314

0,492

0,323

630

0,427

0,245

0,429

0,247

0,439

0,260

0,447

0,270

0,467

0,294

0,475

0,303

800

0,418

0,234

0,420

0,236

0,429

0,248

0,437

0,258

0,456

0,281

0,463

0,289


The inductance of phase for three-core cable is indicated in the table below.

Nominal conductor cross-sectional area, mm2

Inductance, mH/km

Rated voltage, kV

6

10

15

20

30

35

35

0,382

0,406

0,431

0,452

---

---

50

0,357

0,380

0,404

0,424

0,467

0,482

70

0,331

0,352

0,376

0,395

0,436

0,451

95

0,312

0,333

0,355

0,374

0,414

0,428

120

0,287

0,307

0,328

0,345

0,383

0,397

150

0,276

0,294

0,315

0,332

0,369

0,382

185

0,261

0,279

0,299

0,315

0,350

0,363

240

0,249

0,264

0,282

0,298

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