ДСТУ HD 60364-4-442:2022 Електричні установки низької напруги. Частина 4-442. Захист для безпеки. Захист установок низької напруги від тимчасових перенапруг через замикання на землю в системі високої напруги...

ДСТУ HD 60364-4-442:2022
(HD 60364-4-442:2012, IDT; IEC 60364-4-44:2007, MOD)

Електричні установки низької напруги. Частина 4-442. Захист для безпеки. Захист
установок низької напруги від тимчасових перенапруг через замикання на землю в
системі високої напруги та через несправності в системі низької напруги

 
     
Не є офіційним виданням.
Офіційне видання розповсюджує національний орган стандартизації
(ДП «УкрНДНЦ» http://uas.gov.ua)

CONTENTS

FOREWORD

INTRODUCTION

440.1 Scope

440.2 Normative references

441 (Vacant)

442 Protection of low-voltage installations against temporary overvoltages due to earth faults in the high-voltage system and due to faults in the low-voltage system

442.1 Scope and object

442.2 Overvoltages in LV-systems during a high-voltage earth fault

442.3 Power frequency stress voltage in case of loss of the neutral conductor in a TN and TT system

442.4 Power frequency stress voltage in the event of an earth fault in an IT system with distributed neutral

442.5 Power frequency stress voltage in the event of short-circuit between a line conductor and the neutral conductor

443 Protection against overvoltages of atmospheric origin or due to switching

443.1 General

443.2 Classification of impulse withstand voltages (overvoltage categories)

443.2.1 Purpose of classification of impulse withstand voltages (overvoltage categories)

443.2.2 Relationship between impulse withstand voltages of equipment and
overvoltage categories

443.3 Arrangements for overvoltage control

443.4 Required impulse withstand voltage of equipment

444 Measures against electromagnetic influences

444.1 General

444.2 (void)

444.3 Definitions

444.4 Mitigation of Electromagnetic Interference (EMI)

444.5 Earthing and equipotential bonding

444.6 Segregation of circuits

444.7 Cable management systems

445 Protection against undervoltage

445.1 General requirements

Annex A (informative) Explanatory notes concerning 442.1 and 442.2

Annex В (informative) Guidance for overvoltage control by SPDs applied to overhead lines

Annex C (normative) Determination of the conventional length, d

Bibliography