calibration of miniature circuit breaker in automation industries
S.Akshay Kumar,K.V.Brajesh ,S.Kavin,S.R.Balaji
Published in International Journal of Advanced Research in Electronics, Communication & Instrumentation Engineering and Development
ISSN: 2347 -7210 Impact Factor:1.9 Volume:3 Issue:2 Year: 04 April,2017 Pages:159-166
Abstract
MCBs or Miniature Circuit Breakers are electromechanical devices which protect an electrical circuit from an overcurrent. They are primarily designed to protect cables and lines against overload (thermal) and short-circuit(electromagnetic). They thus care for protecting this electrical equipment against excessive temperature rises and destruction in the event of a short-circuit. They are used in industries to protect their expensive machines electrically. At present, internal parts of MCB are automatically assembled, but tripping mechanism is checked manually. To overcome the human error and effort, we propose a system to check the tripping mechanism of MCB, thereby ensuring the quality of MCB. The system performs quality inspection in two ways, i.e., cold calibration and continuity test. The cold calibration is a mechanical process where no power supply is needed. A mechanical stress is applied to the bimetallic strip in MCB by screwing it on one end, there causing MCB to trip. This mechanism resembles Overload current effect. Current with higher rating is passed through MCB for long time then its said to be Overload current. The continuity test is an electrical way of inspecting the quality of MCB. Here two leads are placed at both ends of MCB, which acts like a short circuit inside the MCB. Then current is passed through the leads. When a load is applied at input and received at the output, we confirm the continuity in MCB. The entire process is controlled by DELTA PLC.
Kewords
PLC, MCB, automation, continuity, calibration
Reference
[1] Erickson, Kelvin T. (1996). "Programmable Logic Controller". Institue of Electrical and Electronics Engineers. [2] Iqbal S. (2008)" Programmable Logic Controller" (PLC): workhorse of industrial automation". 68-69.IEEEP Journal: 27-31. [3] Petruzuella Frank D. (2005). " Programmable Logic Controllers." Tata Mcgraw-Hill Education [4] Programmable Logic Controller, DELTA instruction sheet. [5] Kevin Collins, PLC Programming for Industrial Automation.
