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Tasks and methods of preventive testing of electrical installationsBog'liq YUQORI KUCHLANISH TEXNIKASI6.1. Tasks and methods of preventive testing of electrical installations
and equipment ………………………………….…………………..
244
6.2. Methods for determination of defects in insulators ….…………
247
7.
OVERVOLTAGES IN ELECTRICAL SYSTEMS ……………...
257
7.1. External overvoltages in electrical systems ……………….……… 257
7.2. Overvoltage from lightning strikes on the elements of power lines 265
7.3. Wave processes on power lines and its circuits…………………..
270
7.4. Lightning resistance of overhead power lines…………………….. 280
7.5. Calculation of disconnection of overhead power lines under the
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influence of lightning...…………………………………………
285
7.6. Internal overvoltage in electrical systems……………………........
293
7.7. Internal overvoltage and the basics of calculating the external
insulation of electrical installations...................................................
307
7.8. Resonant overvoltages in electrical systems……………………..... 314
8.
INSTALLATIONS, APPARATUS AND ARRANGEMENTS
FOR PROTECTION AGAINST VOLTAGE.................................
326
8.1. Lightning rods used in electrical systems………………………...... 326
8.2. Devices for protecting electrical system elements from
overvoltage…………………………………………………………...
338
8.3. Nonlinear surge limiters………………………….............................. 351
8.4. Assessment of the parameters of equipment for protection
against atmospheric overvoltage........................................................
360
8.5. Measures for surge protection……………………………....……..
363
8.6. Types of grounding. Calculation of grounding resistance……....... 372
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