IEEE Std 1818 pdf free download

IEEE Std 1818 pdf free download.Design of Low- Voltage Auxiliary Systems for Electric Power Substations.
pad-mounted transfo rifler: An outdoor transformer utilized as part of an underground distribution system. with enclosed compartment(s) for primary-voltage and secondary-voltage cables entering from below, and mounted on a foundation pad.
panelboard: A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits; designed to be placed in a cabinet or cutout box placed in or against a wall, partition, or other support; and accessible only from the front. (Adapted from the NEC.) See also: switchboard,
period: An interval of time in the battery duty cycle during which the current (or power) is assumed to be constant for purposes of cell-sizing calculations.
rated capacity (lead-acid): The capacity assigned to a cell by its manufacturer for a given discharge rate, at a specified electrolyte temperature and specific gravity, to a given end-of-discharge voltage.
remote terminal unit (RTU): A piece of equipment located at a distance from a master station to facilitate monitoring and control the state of outlying power equipment and to communicate the information back to the master station or host.
separately derived system: A wiring system whose power is derived from a generator, transformer, or converter windings and has no direct electrical connection, including a solidly connected grounded circuit conductor, to supply conductors originating in another system.
series rated system: Each protective device needs to only be rated for the available fault current at its terminals.
station service voltage transformer (SSVT): A transformer that supplies power from a station high-voltage bus to the station auxiliaries and also to the unit auxiliaries during unit startup and shutdown, or when the unit auxiliaries transformer is not available, or both.
switchboard: (A) A large, single-panel, frame, or assembly of panels on which are mounted, on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Switchboards are generally accessible from the rear as well as from the front, and are not intended to be installed in cabinets. (Adapted from the NEC.) (B) A metal-enclosed panel or assembly of panels that may contain molded case, insulated case, or power circuit breakers, bolted pressure contact or fusible switches, protective devices, and instruments. These devices may be mounted on the face or the back of the assembly. Switchboards are generally accessible from the rear as well as from the front; however, they can be front accessible only.
switchgear: (A) A general term covering switching and interrupting devices and their combination with associated control, instrumentation, metering, protective, and regulating devices and covering assemblies of these devices with associated interconnections, accessories, and supporting structures used primarily in connection with the generation, transmission, distribution, and conversion of electrical power. (B) An assembly of equipment used to switch and control electrical power.
tertiary winding: An additional winding in a transformer that can be coimected to a synchronous condenser, a reactor, an auxiliary circuit, etc. For transformers with wye-connected primary and secondary windings, it may also help (1) to stabilize voltages to the neutral, when delta connected (2) to reduce the magnitude of third harmonics when delta connected (3) to control the value of the zero-sequence impedance (4) to serve load.IEEE Std 1818 pdf download.