12.3 Apparatus control APC12.3.1 ApplicationThe apparatus control is a function for control and supervising of circuit breakers,disconnectors, and grounding switches within a bay. Permission to operate is given afterevaluation of conditions from other functions such as interlocking, synchronism check,operator place selection and external or internal blockings.Figure 121 gives an overview from what places the apparatus control function receivecommands. Commands to an apparatus can be initiated from the Control Centre (CC), thestation HMI or the local HMI on the IED front.Station HMIGWccStation busbreakers disconnectors grounding switchesANSI08000227.vsdApparatusControlIEDCLOSE/OPENLocalHMIApparatusControlIEDApparatusControlIEDLocalHMILocalHMICLOSE/OPENCLOSE/OPENANSI08000227 V1 ENFigure 121: Overview of the apparatus control functionsFeatures in the apparatus control function:• Operation of primary apparatuses• Select-Execute principle to give high security• Selection and reservation function to prevent simultaneous operation• Selection and supervision of operator place• Command supervision• Block/deblock of operation• Block/deblock of updating of position indications• Substitution of position indicationsSection 12 1MRK 505 337-UUS -Control324Application manual
