FIELD: electrical engineering; short-circuit protection of indoor and outdoor switchgears. SUBSTANCE: groups of photosensors of switchgear cubicles are connected into balanced circuit, and use of measuring element responsive to voltages of different polarity provide reliable protection of switchgear. EFFECT: enhanced reliability of protection. 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| DIFFERENTIAL ARC PROTECTIVE DEVICE FOR METALCLAD SWITCHGEAR | 1992 |
|
RU2020687C1 |
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|
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| CENTRALIZED ARC PROTECTION DEVICE FOR CUBICLE-TYPE ELECTRICAL INSTALLATIONS | 1992 |
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|
SU1584029A1 |
