IEEE C57.148-2011 pdf free download.IEEE Standard for Control Cabinets for Power Transformers.
control cabinet: The primary cabinet(s) on a Class I or Class II transformer that contains the control panels for relay, metering, alarms, cooling controls, auxiliary power, and related circuits for user connection to the related systems in the substation. control cabinet designer: The engineer or designer responsible for designing the layout and circuitry in the control cabinet. continuous hinge: A long hinge with one continuous pin, attached along the full available lengths of a door and frame. Also referred to as a piano hinge. Deutsches Institut für Normung e.V. (German Institute for Standardization) (DIN) rail: A standard 35-mm-wide metal rail used to mount terminals, circuit breakers, and other types of devices (as specifed in DIN EN 50022). ethylene-tetrafuoroethylene (ETFE): A modifed compound used for wire and cable insulation and jackets. fuorinated ethylene propylene (FEP): A compound used for wire and cable insulation and jackets. ground fault circuit interrupter (GFCI): A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds established values. machine tool wire: A fexible, stranded wire with a polyvinylchloride (PVC) insulation and jacket compound. manufacturer: The organization that constructs or supplies the device or equipment. positive temperature coeffcient (PTC) heater: A type of heater that provides self-regulating temperature control resulting from the thermal-resistive properties of the ceramic materials used for the heating elements. supplier: Refers to the transformer manufacturer when the control cabinet has been supplied by the transformer manufacturer, or refers to the control cabinet manufacturer when the control cabinet has been ordered directly from the control cabinet manufacturer by the user. switchboard wire (SIS): A fexible, stranded, tin-coated wire, with a cross-linked polyethylene (XLP) insulation and jacket compound.
5. Standard cabinet construction 5.1 General The following standard cabinet construction requirements shall apply to all control cabinets covered under this standard. Note that references herein to the National Electric Code ® (NEC ® ) (NFPA 70 ® ) are not intended to include the complete NEC as a normative reference. All references to the NEC in this standard are specifc to the topic covered in the clauses containing the references only, and any other NEC requirements not referenced in this document do not apply to control cabinets covered under this standard. 5.2 Cabinet-housing criteria Unless specified otherwise, the complete cabinet shall be constructed for outdoor use to meet or exceed the NEMA 3 designation as detailed in NEMA 250, similar to an IP63 Ingress Protection designation as detailed in IEC 60529. For special application environments such as corrosive or chemical atmospheres, marine or explosion proof requirements, the appropriate NEMA, IEC or other designations shall be specifed by the user. The NEMA Type performance requirements are defned in NEMA 250. The IEC designations are defned in IEC 60529. Cabinets with gross weight greater than 20 kg (44.1 lb) shall have provisions for lifting and a suffcient number of external tabs for the purpose of bolting to the transformer. Additional external brackets for mounting gauges shall be specifed by the transformer manufacturer or user. Cabinet mounting provisions shall meet the specifed requirements of the user or supplier, respectively, depending on who orders the cabinet from the manufacturer. One such requirement is the ability to accommodate vibration suppressors or similar mounting hardware. Unless specifed otherwise by the user or supplier, the control cabinet shall be designed to be mounted on the transformer with not less than a 200 mm (7.9 in) air space between the back of the cabinet and the transformer tank wall.