IEEE 1547.6-2011 pdf download
IEEE 1547.6-2011 pdf download.IEEE Recommended Practice for Interconnecting Distributed Resources with Electric Power Systems Distribution Secondary Networks.
3. Definitions, acronyms, and abbreviations
3.1 Definitions
For the purposes of this document, the following terms and definitions apply The IEEE Siwidards Dlconarv: Glossary of Terrn DØiniiiwo should be consulted for ternw not defined in this clause.4
cable limiter: See: network limiter.
contingency (contingencies): The number of coincidental distribution system equipment outages (e.g.. feeders) that can be tolerated without adversely affecting the character of customer service. Distribution systems can be categorired with respect to the allowable contingencies accommodated while still supplying customer load reliably. For instance, a radial distribution system is identified as a 7cm-contingency design because the loss of the primary feeder would result in a customer outage and thus seriously affect associated customers. Some area networks arc designed and operated to a second-contingency criteria, and in these distribution systems, two primary feeders can be out of service without affecting customer service,
cycling: Undesirable repetitive tripping and closing of a network protector (NP) because of variations in loading and other conditions.
distribution secondary network: An ac distribution system where the secondaries of the disiobution transformers are connected to a common network for supplying electricity directly to consumers, There are two types of secondary networks: grid networks (also referred to as area networ&s or xhwl ntwarAs) and spot networkii.Svn. secondary network.
dynamicalls controlled inserter (DCI): An invcl’tcr with the capability to govern its power output based on an input control signaL
grid network: A secondary network system with geographically separated network units (Ntis) and the network-side terminals of the network protectors (NPs) interconnected by low-voltage cables that span the distance between sites. The low-voltage cable circuits of the giid networks are typically supplied by numerous Ntis.
Interconnecilon study: A study to ascertain the effect of pirallel operation of a distributed resources (DR) on the distribution network system. I; may be used to determine the scope and cost of the modifications needed to accommodate parallel DR operations.
network limiter: An enclosed tiisc for disconnecting a faulted cable from a low-voltage network disinbution system and for protecting the unfaultcd portions of that cable against serious thermal damage. Syn: cablc limiter.
network master relay: A relay that functions as a protective relay by opening a network protector (NP) when power is back-fed into the supply system and as a programming relay by closing the protector in conjunction with the network phasing relay when polyphase ‘.oltage phasors are within prescribed limits.
network protector (%P): An assembly composed of a circuit breaker and its complete control equipment for aulomatically disconnecting a tr4nsfonner from a secondary network in response to predetermined electrical conditions on the pnmary feeder or transformer and for connecting a transformer to a secondary network through manual or automatic control responsive to predetermined electrical conditions on the feeder and the secondary nctwork The NP is usually arranged to automatically connect Its associated transformer to the network when conditions arc such that the transfonncr. when connected, will supply power to the network and to automatically disconnect the transformer from the network when power flows from the network to the transformer.
network system: A collection of spot networks. secondary grid networks, or combinations of such networks and the primary tèeders that supply them,
network system rellablllts: A measure of the degree of ceslainty that the network system will perform its required functions under staid conditions for a stated time. Typical indices used to measure the reliability of a network system include the number of service interruptions (i.e., a complete loss of voltage), the frequency of service interruptions, and the duration of interruptions.
network transformer: A transformer designed for usc in a vault, or othcr location, to feed a variable capacity system of interconnected secondaries. It usually, but not always, has a provision for attaching a network protector (NP) It can also have provisions for primary grounding or disconnection
network unIt (NU): This unit consists of a primary disconnect andor grounding switch, a network trimsfurmcr, and a network protector (NP) with its controls. protection. and communications.
phasing soltage (of a network protector): The voltage across the open contacts of a selected phase
NOTE—This sohage is equal to 11w phasor difference bcnsccn the iransfonner ottagc and thc corresponding network solLagc
prIntar network Feeder: A fccder that supplies energy to a network system or the combination of a network system and other radial load.s. L)edicated primary network feeders arc t’eeders that supply only network transformers for the grid network, the spot network, or both. Non-dedicated primary network feeders, sometimes called co,nhinatio,, feeders. arc ieedem that supply both network transformers and non- network load.
solid-state or microprocessor network relay: A relay with few or no mechanical parts, using solid-slate components. that performs the combined functions of the master and phasing relays, and that may include a time delay function.
