GLOSSARY & DEFINITIONS
GLOSSARY & DEFINITIONS(GD)GD.1In the Grid Code the following words and expressions shall, unless the subject matter orcontext otherwise requires or is inconsistent therewith, bear the following meanings:Access GroupA group of Connection Points within which a User declares under thePlanning Code(a)An interconnection and/or(b)A need to redistribute Demand between those Connection Pointseither pre-fault or post-faultWhere a single Connection Point does not form part of an AccessGroup in accordance with the above, that single Connection Point shallbe considered to be an Access Group in its own right.Access PeriodA period of time in respect of which each Transmission InterfaceCircuit is to be assessed as whether or not it is capable of beingmaintained as derived in accordance with PC.A.4.1.4. The period shallcommence and end on specified calendar weeks.ActThe Electricity Act 1989 (as amended by the Utilities Act 2000 and theEnergy Act 2004).Active EnergyThe electrical energy produced, flowing or supplied by an electric circuitduring a time interval, being the integral with respect to time of theinstantaneous power, measured in units of watt-hours or standardmultiples thereof, ie:1000 Wh 1 kWh1000 kWh 1 MWh1000 MWh 1 GWh1000 GWh 1 TWhActive PowerThe product of voltage and the in-phase component of alternating currentmeasured in units of watts and standard multiples thereof, ie:1000 Watts 1 kW1000 kW 1 MW1000 MW 1 GW1000 GW 1 TWAffiliateIn relation to any person, any holding company or subsidiary of suchperson or any subsidiary of a holding company of such person, in eachcase within the meaning of Section 736, 736A and 736B of theCompanies Act 1985 as substituted by section 144 of the Companies Act1989 and, if that latter section is not in force at the Transfer Date, as ifsuch section were in force at such date.AF RulesHas the meaning given to “allocation framework” in section 13(2) of theEnergy Act 2013.Issue 5 Revision 20GD1 of 5520 February 2017
AgencyAs defined in the Transmission Licence.Alternate MemberShall mean an alternate member for the Panel Members elected orappointed in accordance with this GR.7.2(a) or (b).Ancillary ServiceA System Ancillary Service and/or a Commercial Ancillary Service,as the case may be.Ancillary ServicesAgreementAn agreement between a User and NGET for the payment by NGET tothat User in respect of the provision by such User of Ancillary Services.Annual Average ColdSpell Conditions or ACSConditionsA particular combination of weather elements which gives rise to a levelof peak Demand within a Financial Year which has a 50% chance ofbeing exceeded as a result of weather variation alone.Apparent PowerThe product of voltage and of alternating current measured in units ofvoltamperes and standard multiples thereof, ie:1000 VA 1 kVA1000 kVA 1 MVAApparatusOther than in OC8, means all equipment in which electrical conductorsare used, supported or of which they may form a part. In OC8 it meansHigh Voltage electrical circuits forming part of a System on whichSafety Precautions may be applied to allow work and/or testing to becarried out on a System.Approved Fast TrackProposalHas the meaning given in GR.26.7, provided that no objection is receivedpursuant to GR.26.12.Approved Grid CodeSelf-GovernanceProposalHas the meaning given in GR.24.10.Approved ModificationHas the meaning given in GR.22.7Authorised ElectricityOperatorAny person (other than NGET in its capacity as operator of the NationalElectricity Transmission System) who is authorised under the Act togenerate, participate in the transmission of, distribute or supply electricity.Authority-LedModificationA Grid Code Modification Proposal in respect of a Significant CodeReview, raised by the Authority pursuant to GR.17Authority-LedModification ReportHas the meaning given in GR.17.4.Automatic VoltageRegulator or AVRThe continuously acting automatic equipment controlling the terminalvoltage of a Synchronous Generating Unit by comparing the actualterminal voltage with a reference value and controlling by appropriatemeans the output of an Exciter, depending on the deviations.Authority for AccessAn authority which grants the holder the right to unaccompanied accessto sites containing exposed HV conductors.Authority, TheThe Authority established by section 1 (1) of the Utilities Act 2000.Issue 5 Revision 20GD2 of 5520 February 2017
AuxiliariesAny item of Plant and/or Apparatus not directly a part of the boiler plantor Generating Unit or DC Converter or Power Park Module, butrequired for the boiler plant's or Generating Unit's or DC Converter’s orPower Park Module’s functional operation.Auxiliary Diesel EngineA diesel engine driving a Generating Unit which can supply a UnitBoard or Station Board, which can start without an electrical powersupply from outside the Power Station within which it is situated.Auxiliary Gas TurbineA Gas Turbine Unit, which can supply a Unit Board or Station Board,which can start without an electrical power supply from outside thePower Station within which it is situated.Average ConditionsThat combination of weather elements within a period of time which is theaverage of the observed values of those weather elements duringequivalent periods over many years (sometimes referred to as normalweather).Back-Up ProtectionA Protection system which will operate when a system fault is notcleared by other Protection.Balancing andSettlement Code or BSCThe code of that title as from time to time amended.Balancing Code or BCThat portion of the Grid Code which specifies the Balancing Mechanismprocess.Balancing MechanismHas the meaning set out in NGET’s Transmission LicenceBalancing MechanismReporting Agent orBMRAHas the meaning set out in the BSC.Balancing MechanismReporting Service orBMRSHas the meaning set out in the BSC.Balancing PrinciplesStatementA statement prepared by NGET in accordance with Condition C16 ofNGET’s Transmission Licence.Baseline ForecastHas the meaning given to the term ‘baseline forecase’ in Section G of theBSC.Bid-Offer Acceptance(a)A communication issued by NGET in accordance with BC2.7; or(b)an Emergency Instruction to the extent provided for in BC2.9.2.3.Bid-Offer DataHas the meaning set out in the BSC.Bilateral AgreementHas the meaning set out in the CUSCBlack StartThe procedure necessary for a recovery from a Total Shutdown orPartial Shutdown.Issue 5 Revision 20GD3 of 5520 February 2017
Black Start CapabilityAn ability in respect of a Black Start Station, for at least one of itsGensets to Start-Up from Shutdown and to energise a part of theSystem and be Synchronised to the System upon instruction fromNGET, within two hours, without an external electrical power supply.Black Start StationsPower Stations which are registered, pursuant to the BilateralAgreement with a User, as having a Black Start Capability.Black Start TestA Black Start Test carried out by a Generator with a Black StartStation, on the instructions of NGET, in order to demonstrate that aBlack Start Station has a Black Start Capability.Block Load CapabilityThe incremental Active Power steps, from no load to Rated MW, whicha generator can instantaneously supply without causing it to trip or gooutside the Frequency range of 47.5 – 52Hz (or an otherwise agreedFrequency range). The time between each incremental step shall alsobe provided.BM ParticipantA person who is responsible for and controls one or more BM Units orwhere a Bilateral Agreement specifies that a User is required to betreated as a BM Participant for the purposes of the Grid Code. For theavoidance of doubt, it does not imply that they must be active in theBalancing Mechanism.BM UnitHas the meaning set out in the BSC, except that for the purposes of theGrid Code the reference to “Party” in the BSC shall be a reference toUser.BM Unit DataThe collection of parameters associated with each BM Unit, as describedin Appendix 1 of BC1.Boiler Time ConstantDetermined at Registered Capacity, the boiler time constant will beconstrued in accordance with the principles of the IEEE CommitteeReport "Dynamic Models for Steam and Hydro Turbines in Power SystemStudies" published in 1973 which apply to such phrase.British Standards or BSThose standards and specifications approved by the British StandardsInstitution.BSCCoHas the meaning set out in the BSC.BSC PanelHas meaning set out for “Panel” in the BSC.BS Station TestA Black Start Test carried out by a Generator with a Black StartStation while the Black Start Station is disconnected from all externalalternating current electrical supplies.BS Unit TestA Black Start Test carried out on a Generating Unit or a CCGT Unit, asthe case may be, at a Black Start Station while the Black Start Stationremains connected to an external alternating current electrical supply.Business DayAny week day (other than a Saturday) on which banks are open fordomestic business in the City of London.Cancellation of NationalElectricity TransmissionSystem WarningThe notification given to Users when aTransmission System Warning is cancelled.Issue 5 Revision 20GD4 of 55NationalElectricity20 February 2017
Capacity MarketDocumentsThe Capacity Market Rules, The Electricity Capacity Regulations 2014and any other Regulations made under Chapter 3 of Part 2 of the EnergyAct 2013 which are in force from time to time.Capacity Market RulesThe rules made under section 34 of the Energy Act 2013 as modifiedfrom time to time in accordance with that section and The ElectricityCapacity Regulations 2014.Cascade Hydro SchemeTwo or more hydro-electric Generating Units, owned or controlled by thesame Generator, which are located in the same water catchment areaand are at different ordnance datums and which depend upon a commonsource of water for their operation, known eaulywhich will comprise more than one Power Station.Cascade Hydro SchemeMatrixThe matrix described in Appendix 1 to BC1 under the heading CascadeHydro Scheme Matrix.Caution NoticeA notice conveying a warning against interference.Category 1 IntertrippingSchemeA System to Generator Operational Intertripping Scheme arising froma Variation to Connection Design following a request from the relevantUser which is consistent with the criteria specified in the Security andQuality of Supply Standard.Category 2 IntertrippingSchemeA System to Generator Operational Intertripping Scheme which is:(i)required to alleviate an overload on a circuit which connects theGroup containing the User’s Connection Site to the NationalElectricity Transmission System; and(ii)installed in accordance with the requirements of the planningcriteria of the Security and Quality of Supply Standard in orderthat measures can be taken to permit maintenance access foreach transmission circuit and for such measures to beeconomically justified,and the operation of which results in a reduction in Active Power on theoverloaded circuits which connect the User’s Connection Site to therest of the National Electricity Transmission System which is equal tothe reduction in Active Power from the Connection Site (once anysystem losses or third party system effects are discounted).Category 3 IntertrippingSchemeIssue 5 Revision 20A System to Generator Operational Intertripping Scheme which,where agreed by NGET and the User, is installed to alleviate an overloadon, and as an alternative to, the reinforcement of a third party system,such as the Distribution System of a Public Distribution SystemOperator.GD5 of 5520 February 2017
Category 4 IntertrippingSchemeA System to Generator Operational Intertripping Scheme installed toenable the disconnection of the Connection Site from the NationalElectricity Transmission System in a controlled and efficient manner inorder to facilitate the timely restoration of the National ElectricityTransmission System.CENELECEuropean Committee for Electrotechnical Standardisation.Citizens AdviceMeans the National Association of Citizens AdviceBureaux.Citizens AdviceScotlandMeans the Scottish Association of Citizens AdviceCfD CounterpartyA person designated as a “CfD counterparty” under section 7(1) of theEnergy Act 2013.CfD DocumentsThe AF Rules, The Contracts for Difference (Allocation) Regulations2014, The Contracts for Difference (Definition of Eligible Generator)Regulations 2014 and The Contracts for Difference (Electricity SupplierObligations) Regulations 2014 and any other regulations made underChapter 2 of Part 2 of the Energy Act 2013 which are in force from timeto time.CfD Settlement ServicesProvidermeans any person:Bureaux.(i)appointed for the time being and from time to time by a CfDCounterparty; or(ii)who is designated by virtue of Section C1.2.1B of theBalancing and Settlement Code,in either case to carry out any of the CFD settlement activities (or anysuccessor entity performing CFD settlement activities).CCGT Module MatrixThe matrix described in Appendix 1 to BC1 under the heading CCGTModule Matrix.CCGT Module PlanningMatrixA matrix in the form set out in Appendix 3 of OC2 showing thecombination of CCGT Units within a CCGT Module which would berunning in relation to any given MW output.CM AdministrativePartiesThe Secretary of State, the CM Settlement Body, and any CMSettlement Services Provider.CM Settlement Bodythe Electricity Settlements Company Ltd or such other person as mayfrom time to time be appointed as Settlement Body under regulation 80 ofthe Electricity Capacity Regulations 2014.CM Settlement ServicesProviderany person with whom the CM Settlement Body has entered into acontract to provide services to it in relation to the performance of itsfunctions under the Capacity Market Documents.Issue 5 Revision 20GD6 of 5520 February 2017
Code AdministrationCode of PracticeCode AdministratorMeans the code of practice approved by the Authority and:(a)developed and maintained by the code administrators in existencefrom time to time; and(b)amended subject to the Authority’s approval from time to time;and(c)re-published from time to time;Means NGET carrying out the role of Code Administrator in accordancewith the General Conditions.Combined Cycle GasTurbine Module orCCGT ModuleA collection of Generating Units (registered as a CCGT Module underthe PC) comprising one or more Gas Turbine Units (or other gas basedengine units) and one or more Steam Units where, in normal operation,the waste heat from the Gas Turbines is passed to the water/steamsystem of the associated Steam Unit or Steam Units and where thecomponent units within the CCGT Module are directly connected bysteam or hot gas lines which enable those units to contribute to theefficiency of the combined cycle operation of the CCGT Module.Combined Cycle GasTurbine Unit or CCGTUnitA Generating Unit within a CCGT Module.Commercial AncillaryServicesAncillary Services, other than System Ancillary Services, utilised byNGET in operating the Total System if a User (or other person) hasagreed to provide them under an Ancillary Services Agreement orunder a Bilateral Agreement with payment being dealt with under anAncillary Services Agreement or in the case of ExternallyInterconnected System Operators or Interconnector Users, underany other agreement (and in the case of Externally InterconnectedSystem Operators and Interconnector Users includes ancillaryservices equivalent to or similar to System Ancillary Services).Commercial BoundaryHas the meaning set out in the CUSCCommitted ProjectPlanning DataData relating to a User Development once the offer for a CUSCContract is accepted.Common CollectionBusbarA busbar within a Power Park Module to which the higher voltage sideof two or more Power Park Unit generator transformers are connected.Completion DateHas the meaning set out in the Bilateral Agreement with each User tothat term or in the absence of that term to such other term reflecting thedate when a User is expected to connect to or start using the NationalElectricity Transmission System. In the case of an EmbeddedMedium Power Station or Embedded DC Converter Station having asimilar meaning in relation to the Network Operator’s System as set outin the Embedded Development Agreement.ComplexA Connection Site together with the associated Power Station and/orNetwork Operator substation and/or associated Plant and/orApparatus, as appropriate.Compliance Processesor CPThat portion of the Grid Code which is identified as the ComplianceProcesses.Issue 5 Revision 20GD7 of 5520 February 2017
Compliance StatementA statement completed by the relevant User confirming compliance witheach of the relevant Grid Code provisions, and the supporting evidencein respect of such compliance, of its:Generating Unit(s); or,CCGT Module(s); or,Power Park Module(s); or,DC Converter(s)in the form provided by NGET to the relevant User or another format asagreed between the User and NGET.Connection Conditionsor CCThat portion of the Grid Code which is identified as the ConnectionConditions.Connection EntryCapacityHas the meaning set out in the CUSCConnected PlanningDataData which replaces data containing estimated values assumed forplanning purposes by validated actual values and updated estimates forthe future and by updated forecasts for Forecast Data items such asDemand.Connection PointA Grid Supply Point or Grid Entry Point, as the case may be.Connection SiteA Transmission Site or User Site, as the case may be.ConstructionAgreementHas the meaning set out in the CUSCConsumerRepresentativeMeans the person appointed by the Citizens Advice or the CitizensAdvice Scotland (or any successor body) representing all categories ofcustomers, appointed in accordance with GR.4.2(b)Contingency ReserveThe margin of generation over forecast Demand which is required in theperiod from 24 hours ahead down to real time to cover againstuncertainties in Large Power Station availability and against bothweather forecast and Demand forecast errors.Control CallsA telephone call whose destination and/or origin is a key on the controldesk telephone keyboard at a Transmission Control Centre and which,for the purpose of Control Telephony, has the right to exercise priorityover (ie. disconnect) a call of a lower status.Control CentreA location used for the purpose of control and operation of the NationalElectricity Transmission System or DC Converter Station owner'sSystem or a User System other than a Generator's System or anExternal System.Control EngineerA person nominated by the relevant party for the control of its Plant andApparatus.Control PersonThe term used as an alternative to "Safety Co-ordinator" on the SiteResponsibility Schedule only.Control PhaseThe Control Phase follows on from the Programming Phase andcovers the period down to real time.Issue 5 Revision 20GD8 of 5520 February 2017
Control PointThe point from which:(a)A Non-Embeddedcontrolled; orCustomer'sPlantandApparatusis(b)A BM Unit at a Large Power Station or at a Medium PowerStation or representing a Cascade Hydro Scheme or with aDemand Capacity with a magnitude of:(i)50MW or more in NGET’s Transmission Area; or(ii)30MW or more in SPT’s Transmission Area; or(iii)10MW or more in SHETL’s Transmission Area,(iv)10MW or more which is connected to an OffshoreTransmission Systemis physically controlled by a BM Participant; or(c)In the case of any other BM Unit or Generating Unit, datasubmission is co-ordinated for a BM Participant and instructionsare received from NGET,as the case may be. For a Generator this will normally be at a PowerStation but may be at an alternative location agreed with NGET. In thecase of a DC Converter Station, the Control Point will be at a locationagreed with NGET. In the case of a BM Unit of an Interconnector User,the Control Point will be the Control Centre of the relevant ExternallyInterconnected System Operator.Control leEngineer/Operator and NGET Control Engineer(s) speak to oneanother for the purposes of control of the Tot
Auxiliary Gas Turbine A Gas Turbine Unit, which can supply a Unit Board or Station Board, which can start without an electrical power supply from outside the Power Station within which it is situated. Average Conditions That combination of weather elements within a period of time which i
ITIL Glossary of Terms, Definitions and Acronyms in Hungarian, V3.1.24.h2.5, 24 February 2008, prepared by itSMF Hungary 1 ITIL V3 Hungarian Glossary Notes: 1. This ITIL V3 Hungarian Glossary (internal version: 2.5) is the itSMF Hungary's official translation of ITIL V3 Glossary of Terms, Definitions and Acronyms (version 3.1.24). 2. The Hungarian ITIL Terms have a relatively long .
Mathematics — Glossary Page 1 – 2014–15 NYSAA Frameworks Glossary – Mathematics Mathematics Glossary A Mathematics Toolkit, i
The primary aim of this Glossary is to ensure homogeneity in the use of terms and associated definitions in the documents generated by AC/310. Where possible, all terms and definitions should be taken from AAP-6, or from this AOP, in accordance with their meaning. Where new terms and definitions are needed to understand unambiguously a document,
This Glossary represents an initial step in a process of harmonising health and wellness terms within the consumer goods industry. The Glossary is intended to complement existing definitions. The success of the glossary is dependent on individuals and companies using the terms and definit
IEEE Std 729-1983, IEEE Standard Glossary of Software Engineering Terminology (ANSI) L3I.l It increases the number of terms from approximately 500 to 1300, and updates or refines the definitions of many terms included in the initial glossary. A few terms that were included in the initial glossary have
(b) Terminology from safety and safeguards that is addressed in the IAEA Safety Glossary [46] or IAEA Safeguards Glossary [47]. Such terms and definitions may in some cases be referred to or discussed in the IAEA Nuclear Security Glossary, but the other glossaries should be consulted where they are the appropriate authorities.
8.2 Inductive and recursive definitions 167 8.3 The format of definitions 168 8.4 Instantiations of definitions 170 8.5 A formal format for definitions 172 8.6 Definitions depending on assumptions 174 8.7 Giving names to proofs 175 8.8 A general proof and a specialised version 178 8.9 Mathematical statements as formal definitions 180
Social Studies Glossary English Haitian Creole Translation of Social Studies terms based on the Coursework for Social Studies Grades 6 to 8. This glossary is to PROVIDE PERMITTED TESTING ACCOMMODATIONS of ELL/MLL students. It should also be used for INSTRUCTION during the school year. The glos
