ISO/IEC 22237-3:2021 情報技術—データセンターの設備とインフラストラクチャ—パート3：配電 | ページ 6

3.1.1

active power

P

Note 1 to entry: Under sinusoidal conditions, the active power is the real part of the complex power S, thus P = Re S.

Note 2 to entry: The coherent SI unit for active power is watt, W.

[SOURCE:IEC 60050‑131:2002, 131-11-42]

3.1.2

additional supply

power supply that provides power in the event of failure of primary (3.1.22) and/or secondary supply (3.1.24)

3.1.3

apparent power

product of the r.m.s. voltage U between the terminals of a two-terminal element or two-terminal circuit and the r.m.s. electric current I in the element or circuit S = UI

Note 1 to entry: Under sinusoidal conditions, the apparent power is the modulus of the complex power S , thus S = | S |.

Note 2 to entry: The coherent SI unit for apparent power is voltampere, VA.

[SOURCE:IEC 60050‑131:2002, 131-11-41]

3.1.4

capacitive load

load that is capacitive, so that the alternating current is out of phase with and leads the voltage

3.1.5

catenary

wire hung at a specific tension between supporting structures of power cabling

3.1.6

diverse route

alternative separate pathway intended to provide adequate segregation from another pathway, in order to maintain service provision in the event of physical damage to one of the pathways

3.1.7

dual-corded equipment

equipment served by multiple power supply input interfaces

3.1.8

emergency power off

EPO

designated device to provide emergency switching which disconnects power from one or more data centre facilities, infrastructures or spaces

Note 1 to entry: The configuration and function of emergency power off devices can be subject to national or local regulations.

3.1.9

fire compartment

discrete zone designed to contain a fire within that zone

3.1.10

high voltage

HV

voltage whose nominal r.m.s. value is 35 kV < U_N ≤ 230 kV

Note 1 to entry: Because of existing network structures, in some countries the boundary between MV and HV can be different.

3.1.11

inductive load

load that is inductive, so that the alternating current is out of phase with and lags behind the voltage

3.1.12

IT load

electrical consumption of all the information technology equipment, providing data storage, processing and transport services, measured at its input terminals including all on-board integrated power supplies and cooling fans

3.1.13

load factor

ratio, expressed as a numerical value or as a percentage, of the consumption within a specified period (year, month, day, etc.), to the consumption that would result from continuous use of the maximum or other specified demand occurring within the same period

Note 1 to entry: This term should not be used without specifying the demand and the period to which it relates.

Note 2 to entry: The load factor for a given demand is also equal to the ratio of the utilization time to the time in hours within the same period.

[SOURCE:IEC 60050‑691:1973, 691-10-02]

3.1.14

locally protected socket

sockets (3.1.26) which continue to deliver power to connected equipment for a defined period following failure of power supply and distribution equipment by means of a battery supply or UPS adjacent to, or co-located with, those sockets (e.g. emergency lighting)

3.1.15

low voltage

lv

voltage whose nominal r.m.s. value is U_N ≤ 1 kV

3.1.16

Main-Tie-Tie-Main

electrical connection between two power supply or power distribution circuits which allows current to flow in either direction and containing two circuit breakers enabling maintenance while one of the circuits is active

3.1.17

medium voltage

MV

voltage whose nominal r.m.s. value is 1 kV < U_N ≤ 35 kV

Note 1 to entry: Because of existing network structures, in some countries the boundary between MV and HV can be different.

3.1.18

pathway

<cable route, cable way> defined route for cables between termination points

[SOURCE:ISO/IEC 14763‑2:2019, 3.1.34]

3.1.19

power factor

λ

Note 1 to entry: This is the ratio of the active (real) power flowing to the load to the apparent power (as a result of the capacitive or inductive nature of the load) and is a dimensionless number between 0 and 1.

[SOURCE:IEC 60050‑131:2002, 131-11-46, modified — new Note 1 to entry added.]

3.1.20

protected socket

socket (3.1.26) which continues to deliver power to connected equipment for a defined period following failure of power supply and distribution equipment

3.1.21

primary distribution equipment

equipment which is required to manage, control and convert incoming power supplies (primary, secondary and, where appropriate, additional) (3.1.22, 3.1.24, 3.1.2) in a form suitable for distribution by secondary distribution equipment (3.1.23)

3.1.22

primary supply

principal power supply that provides power to the data centre under normal operating conditions

3.1.23

secondary distribution equipment

equipment which is required to manage, control and distribute the power provided by the primary distribution equipment (3.1.21) to the short-break, protected and unprotected sockets (3.1.25, 3.1.20, 3.1.30) within the data centre and to the tertiary distribution equipment (3.1.27)

Note 1 to entry: The power supply can be single-phase AC, three-phase AC or DC. If there is a change from 3-phase to 1-phase supply, this is generally achieved at the secondary distribution equipment that is served directly from the primary distribution equipment.

3.1.24

secondary supply

power supply independent from, and that is continuously available to be used to provide power to the data centre following the disruption of, the primary power supply

Note 1 to entry: A second feed to a separate transformer from the same grid is not a secondary supply.

3.1.25

short-break socket

sockets (3.1.26) which, upon failure of power supply and distribution equipment, will be provided with power from an additional supply (3.1.2) after a defined period

3.1.26

socket

connection enabling the supply of power to attached equipment

Note 1 to entry: This can be a de-mateable or a hardwired connection.

3.1.27

tertiary distribution equipment

power supply equipment, typically accommodated within the cabinets, frames and racks of the data centre spaces, which directly feeds the protected sockets (3.1.20) therein

3.1.28

total harmonic distortion of current

THD_i

measurement of the harmonic distortion present on a current level, defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency

3.1.29

total harmonic distortion of voltage

THD_u

measurement of the harmonic distortion present on a voltage level, defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency

3.1.30

unprotected socket

sockets (3.1.26) which fail to deliver power to connected equipment following failure in power supply or distribution equipment