Experimental Investigation of the Effects of IEC 61439-2 Separation Forms on Production Time and Cost in Low-Voltage Switchgear and Controlgear Assemblies

Öz

Separation forms used in low-voltage switchgear and controlgear assemblies provide mechanical segregation between busbar systems, functional units, and terminal connections, thereby contributing to personnel safety, operational continuity, and ease of maintenance. In this study, the effects of Form 1, Form 2A, Form 2B, Form 3A, Form 3B, Form 4A, and Form 4B separation forms defined in IEC 61439-2 on production time and production cost were experimentally investigated under actual manufacturing conditions. A single prototype assembly based on the same electrical design was used throughout the study. The electrical design, manufacturing environment, and assembly team were kept constant, while environmental conditions were maintained within comparable ranges, and the prototype was sequentially converted into different separation forms. Each manufacturing operation was performed once, and operation times were determined from video recordings. For Form 1, the total production time and total production cost were calculated as 327 min and €2968.51, respectively, whereas these values increased to 973 min and €5210.90 for Form 4B. Accordingly, compared with Form 1, the production time of Form 4B increased by 197.6%, while the total production cost increased by 75.5%. However, although production time generally increased with increasing separation level, production cost did not follow the same trend. The total production cost decreased by 4.9% from Form 2B to Form 3A and by 9.1% from Form 3B to Form 4A. These differences were mainly associated with variations in separation components, busbar quantities, circuit breaker and cable cassettes, and other mechanical components required by each separation form. The results demonstrate that production time and production cost represent distinct parameters that should nevertheless be evaluated jointly when selecting a separation form. The findings also indicate that assuming a fixed increase in production cost solely on the basis of the separation level may lead to inaccurate assessments during manufacturing. Since the contribution of the present findings is limited to the prototype and manufacturing conditions investigated in this study, further studies involving different switchgear configurations and manufacturing practices are required to broaden the empirical evidence available in the literature.

Anahtar Kelimeler

• IEC 61439
• LV switchgear assemblies
• Separation forms
• Switchgear manufacturing processes
• Production cost analysis

Etik Beyan

Ethics committee approval was not required because this study did not involve human participants or animals.

Teşekkür

This article was produced from the master's thesis of Hasan Metin conducted under the supervision of Murat Fidan. The authors would like to thank Prosis Elektrik for providing access to its low-voltage switchgear manufacturing facility and for its support during the experimental study.

Kaynakça

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