| Title |
Survey on the Malfunction of MCCB and ELB in Private Electrical Facilities |
| Authors |
Jae-Geun Yoo ; Sang-Ick Lee ; Jeong-Chay Jeon |
| Keywords |
MCCB ; ELB ; Abnormal power ; Harmonics |
| Abstract |
Recently, nuisance tripping or malfunction of MCCB(Molded Case Circuit Breaker) and ELB(Electrical Leakage Breaker) is being increased according as load circuits and equipments of electrical customers are various and complicated, but investigation of actual conditions on malfunction of MCCB and ELB was not implemented. This paper investigated causes and influences of malfunction of MCCB and ELB by making up a question to electrical safety managers of two hundred and eighteen private electrical facilities. The results show that users above 70[%] experienced malfunction of MCCB and ELB, and causes of malfunction are in order aging(above 25[%]), nuisance tripping(above 22[%]), goods badness(above 20[%]), abnormal power like as harmonics(above 20[%]) and others(about 9[%]). Also, second damages due to failure of MCCB and ELB are in order goods production, equipment trouble, information loss, business and operation interrupt, and others. The results of this study can be used in making decisions regarding causes of MCCB and ELB trip. |