The power behind energy efficiency
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Glossary
A
B
C
D
E
F
G
H
I
K
L
M
N
O
P
R
S
T
U
A
“A” Flag – A flag showing against data that has been automatically polled from the meter, either by remote dialling or visiting site with a hand held unit.
Active Energy – The electrical energy produced, flowing or supplied by an electric circuit during a time interval. Measured in units of watt-hours .
Active Power – The product of voltage and the in-phase component of alternating current measured in units of watts.
Agreed Capacity – An agreed amount of electrical load for a property, as stated in the property’s Connection Agreement with the local Distribution Network Operator.
AMR – AMR is the term given to a metering system that provides meter readings remotely.
Aggregation Rules – The rules by reference to which Import or Export Active Energy metered data collected from Outstations relating to meter registers of one or more Metering Systems are to be aggregated.
B
Balancing and Settlement Code – The Legal document setting out the rules for the operation and governance of the Balancing Mechanism and Imbalance Settlement. Al licensed electricity generators and suppliers must sign up to the BSC and other interested parties may also choose to do so.
Balancing Mechanism – The mechanism used by the National Grid Company to balance the supply and demand of electricity.
Boundary Point – A point at which any Plant or Apparatus not forming part of the Total System is connected to the Total System.
Boundary Point Metering System – A Metering System which measures Exports or Imports at a Boundary Point.
BST – Allowance has to be made for the bi-annual clock change and therefore clock change days will show different time period labelling.
C
Capacity – Capacity is the maximum electric output a generator can produce under specific conditions.
CDCA – The BSC Agent for Central Data Collection.
Central Volume Allocation – The determination of quantities of Active Energy to be taken into account for the purposes of Settlement in respect of Volume Allocation Units.
CoMC – Process used to change the measurement class of a metering point.
COP3 – Those sites with demand greater than 1 MW with two meters installed (main and check) supply with three feeds of data (kW, lag, lead).
CoS – The process followed where a customer wants to change their supplier.
COP5 – Those customers with demand between 100 kW and 1 MW.
COP – A code of practice relating to Metering Equipment, established or adopted and from time to time modified by the Panel in accordance with the Code.
Communications Medium – A particular method of transmitting Communications, including telefax, e-mail, telephone or other electronic communications system.
Communications Equipment – Relating to any Boundary Point or Systems Connection Point, in respect of any Metering Equipment: (i) the terminating equipment (which may include a modem) necessary to convert data from such Metering Equipment into a state for transmission to the CDCA for the purposes of Central Volume Allocation or to a Data Collector for the purposes of Supplier Volume Allocation; and (ii) the exchange link which is connected to that terminating equipment; but does not include an Outstation.
CTN – Alternative communication method to BT land lines and Paknet.
CT – Current Transformers allow large loads to be measured by reducing the level of current passing through the meter to a manageable level. An example CT Ratio is 200/5 that means that for every 200 amps of current received, only 5 amps are passed the meter.
D
Data Logger – A data logger collates all the information recorded by a number of smaller meters. Data loggers are only used on large consumption sites.
Data Transfer Service Agreement – The agreement for the provision of a data transfer service made between the Service Controller and users of the Data Transfer Service .
Data Transfer Service Provider – Means a person providing data transfer services.
De-energisation – Means in relation to any Boundary Point or Systems Connection Point the movement of any isolator, breaker or switch or the removal of any fuse whereby no electricity can flow at such point to and from a System; and “de-energised” shall be construed accordingly.
Demand – Rate of electricity usage/consumption.
DC – An electrical current which flows only in one direction in a circuit.
DNO – Companies that are responsible for operating the networks that connect electricity consumers to the national transmission system and provide interconnection with embedded generation. .
E
Electricity – A form of energy resulting from the existence of charged particles (such as electrons or protons), either statically as an accumulation of charge or dynamically as a current. For the settlement process it means Active Energy and Reactive Energy;.
Energisation – In relation to any Boundary Point or Systems Connection Point, the movement of any isolator, breaker or switch or the insertion of any fuse, so as to enable electricity to flow, at such point to and from a System.
Energy Account – An account held or to be held by a Party for the purposes of accounting in Settlement for quantities of Active Energy.
Equipment Owner – A person which is the owner of Metering Equipment comprised in that Metering System.
Equivalent Unmetered Supply – An Unmetered Supply with a Measurement Class of unmetered half hourly consumption.
EAC – Projection of the annualised customer consumption that does not have HH metering, using most recent meter advance and profile information.
F
? Flag – A flag showing that data for that half hourly period has failed to be collected.
“A” Flag – A flag showing against data that has been automatically polled from the meter, either by remote dialling or visiting site with a hand held unit.
“M” Flag – A flag showing against data that has been estimated.
First Run – An Interim Information run, carried out by the Settlement Administration Agent, 5 working days after real time. This is for information only, parties do not pay any invoices based on Interim Information data
First Settlement Period –
G
GPRS – Mobile Data Service available to users of Global System for Mobile Communications (GSM) and IS-136 mobile phones. GPRS data transfer is typically charged per megabyte of transferred data, while data communication via traditional circuit switching is billed per minute of connection time.
GSM – A mobile device which is connected to the meter and remotely reads the meter by signal.
GMT – The Electricity Market operates in GMT.
GSP – The transmission point within a region where customers will take their electricity.
GCF – A factor that adjusts correctable energy so that the total energy.
H
Half Hourly Data Aggregator – A Party Agent appointed by a Supplier to carry out the aggregation of metering data received from Data Collectors.
HHDC – A Party Agent appointed by a Supplier to retrieve, validate and process Half Hourly metering data.. This data is then sent in to the HHDA.
HHMO – Agent appointed to install and maintain HH metering on sites
Half Hourly Metering Equipment – Metering Equipment which provides measurements on a half hourly basis for Settlement purposes.
Half Hourly Metering System – A Metering System which provides measurements on a half hourly basis for Settlement purposes.
I
Import – A flow of electricity at any instant in time to any Plant or Apparatus.
K
kVAr – Kilovoltamperes reactive. A unit of reactive power.
kW – Kilowatt. A derived unit of power.
kWh – Kilowatt-hour. A derived unit of power used within one hour.
L
LL – The amount of electricity lost during transmission down electricity lines.
LLAF – Adjusts MW at station boundary so =entry point.
LLF – The factor applied to the data to allow for the Line Loss.
M
“M” Flag – A flag showing against data that has been estimated.
100kW Metering System – Any Metering System where the average of the maximum monthly electrical demands in the three months of highest maximum demand, either in: (a) the previous twelve months; or (b) the period since the most recent Significant Change of Demand (whichever is the shorter) exceeds 100kW; or (ii) any Metering System where the Profile of a Customer’s electrical demand implies an average of the maximum monthly electrical demands in the three months of highest maximum demand either in: (a) the previous twelve months; or (b) the period since the most recent Significant Change of Demand (whichever is the shorter) exceeding 100kW; or (iii) any CVA Metering Systems; or (iv) an Unmetered Supply where the relevant Distribution System Operator has agreed that the maximum demand is above 100kW; or (v) any Metering System which is for the time being declared by a Supplier in accordance with the relevant BSC Procedure to have a maximum demand in excess of 100kW.
MDD – Data which relate to Supplier Volume Allocation to be provided by the SVAA to all persons involved in Settlement in accordance with BSCP509.
MD – The highest demand will go to in any given period.
MC – The measurement class of a metering system e.g. above 100kW, below 100kW, unmetered.
Meter – The point at which the flow of electricity is actually measured. A single meter can contain more than or more registers for measuring different sub-system quantities. The identifier will be up to ten characters long and consist of the
MA – A person appointed by a Supplier to calculate estimated energy consumption for Equivalent Unmetered Supplies.
MAR – The process of reconciling half hourly energy values with meter advances.
MOA – A Party Agent appointed to install, commission, test and maintain, and rectify faults.
MOP – The MOP is contracted by the end user and is responsible for installing meter and communications link and there after maintaining it.
MTD – All technical details (including Outstation channel mapping) of a Metering System required to enable metered data to be collected and correctly interpreted from that Metering System.
ME – Meters, measurement transformers (voltage, current or combination units), metering protection equipment including alarms, circuitry, associated Communications Equipment and Outstations and wiring.
METD – Technical details of the metering equipment.
Metering Point – The point at which a supply to (Export) or from (Import) a Distribution System: (i) is or is intended to be measured; or (ii) where Metering Equipment has been removed, was or was intended to be measured; or (iii) in the case of an Unmetered
MPAN – A 13 digit number used to identify a metering point, for example, 2212345678997.
Metering System – Metering System is the set of equipment needed to establish one or more energy flows. It thus comprises of meters and outstations together with any necessary infrastructure, including any necessary duplication (such as main & check meters)
MSID – Unique number for a metering system. For SVA metering systems this is equivalent to the MRA’s MPAN core.
MW – Megawatt. A derived unit of power.
MWh – Megawatt hour. A derived unit of power used within one hour.
N
National Demand – The amount of electricity supplied from the Grid Supply Points plus that supplied by Embedded Large Power Stations, plus GB Transmission System Losses, minus the Demand taken by Station Transformers and Pumped Storage Units’.
NHHDA – A Data Aggregator which carries out the aggregation of metering data received from Non Half Hourly Data Collectors.
NHHDC – A Data Collector which retrieves, validates and processes metering data from Non Half Hourly Meters.
Non Half Hourly Meter – A SVA Meter which provides measurements other than on a half hourly basis for Settlement purposes.
NHHMO – Agent appointed to install and maintain NHH metering on sites
Non Half Hourly Metering Equipment – Agent appointed to install and maintain NHH metering on sites
Non Half Hourly Metering System – A SVA Metering System which is not a Half Hourly Metering System
O
Outage – Any withdrawal by the Transmission Company (for maintenance or otherwise), breakdown or failure of any electronic data communications systems.
P
Peak Demand – Point of maximum electricity demand on the national system.
Power Factor – The amount of energy lagging or leading at site (i.e. energy being lost at site through inefficiencies in the systems).
Power Outage – Occurs when a meter detects loss for power for a period of time greater than its programmed limit.
PC – The coefficient used to generate an estimate of consumption.
Proving Test – A mandatory industry process for Half Hourly traded sites, the process involves both the HHDC and the HH MOP downloading kWh data from the meter(s) using independent software, the MOP then compares the kWh values.
The values should always match, any discrepancy found will require a more detailed investigation by the MOP.
PSTN – This is the BT network of standard land lines.
PM – The number applied to the pulse data to give an accurate measure of the data used.
R
R1 – The first reconciliation run of settlement in line with the published settlements calendar. This occurs approximately one month after the first run.
R2 – The second reconciliation run carried out by the SAA in line with the published settlements calendar. This occurs approximately one quarter after the first run.
Reactive Energy – The integral with respect to time of Reactive Power.
Reactive Power – This is the energy that remains stored in the appliance during use and is not converted to useful work.
Registers – In CoP 5 meters the meters can have up to 25 registers set up to provide information on, for example, demand peaks and totals.
S
Settlement Administration Agent – The organisation that performs the Settlement Runs and produce Balancing and Settlement Reports (showing money owed due to actions taken for Balancing and also any Imbalance Settlements)
Settlement – The determination and settlement of amounts payable in respect of Trading Charges in accordance with the Code .
SD – The period from 00:00 hours to 24:00 hours on each day.
SF – The first settlement run that results in money changing hands. Note this isn’t the last run, as a series of reconciliation runs take place later. Should be called the Initial Volume Allocation Run under the BSC.
SIC Code – This is a code based on the typical electricity usage for that type of industry. There are approximately 120 of these codes.
Supplier – A Party which holds a Supply Licence and is responsible for Exports and/or Imports to supply electricity or gas to the National Grid Network.
Supplier Volume Allocation – All the energy used in the Half Hourly (and Non Half Hourly profiled) markets. Effectively all the energy collected and reported by all data collectors
T
(TA) – Generic name for the arrangements defined under the BSC or previously the P&SA .
U
(UMS) – A supply of electricity to a particular inventory of Apparatus in respect of which a Licensed Distribution System Operator has issued an Unmetered Supply Certificate.