Electrical Glossary

 

A

A-H

A/D Conversion

AA

AAAC

AAC

AAC/TW

AASHTO

Absorbed Glass Mat

ACAR

ACB

Access Point

Accuracy Class

ACSR

ACSR/AW

ACSR/TW

ACSS

ACSS/AW

ACSS/TW

Active Material (Battery)

Active Power

Adjustment

Admittance

ADSL

AEIC

Aeolian Vibration

Aerial Cable

AFCI

AFD

AFI

AIC

Air Blast Breakers

AIS

All-or-Nothing Relay

Alley Arm

Alternating Current

Ambient Temperature

American Wire Gage (AWG)

Amorphous Semiconductor

Ampacity

Ampere

Ampere-Hour

Ampere-hour capacity (storage battery)

Ampere-hour meter

Anneal

Anode

ANSI

Antenna Gain

Anti-Pumping Device

Apparent Power (volt-amps)

AR

Arc

Arc Flash

Arc Thermal Performance Value

Arcing Time

Arrester

Askeral

ASTM

ATC

ATP

Automatic line sectionalizer

Automatic Recloser

Autonomous Photovoltaic System

Autotransformer

Auxiliary Power

Auxiliary Relay

AWG

Azimuth

B

Balanced Load

Balanced polyphase system

Ballast

Bandwidth

Basic impulse level (BIL)

Basic Insulation Level

Battery Cell

Battery Tray

Bay-O-Net

Beacon

Beam Spread

Bias Current

Biased Relay

Blowing

Bluetooth

Bonding

Boost Charge

Booster Transformer

Breakdown Voltage

Brownout

Buck

Bulb Envelope

Bull Line

Bull Wheel

Bunched Stranding

BURD

Burden

Buried Urban Residential Distribution

Bushing

C

C-Rate

C2H4

C2H6

Cable Pulling Lubricant

Cable Sheath

Cable Tray

CAIDI

CAIFI

Calibration

Calorie

Candela (cd)

Candlepower

Candlepower Distribution Curve

Capacitance

Capacitor

Capacitor bank

Capacitor Voltage Transformer

Capacity (Battery)

Category 5 Cable

Cathode

CB

CDMA

Cell-Reversal (Battery)

CH2H2

CH4

Characteristic Angle

Characteristic Curve

Characteristic Impedance Ratio (C.I.R.)

Charge (Battery)

Charge Controller

Charge Rate (Battery)

Charge-Retention (Battery)

Check Protection System

Chlorinated Polyethylene

Circuit

Circuit Breaker

Circuit Insulation Voltage

Circuit Switchers

Circuit Voltage

Circular-Mil (cmil)

Closing Impulse Time

Closing Time

CO

Coaxial Cable

Coefficient of Utilization (CU)

Coil Loss

Collector Roadway (Lighting)

Combination Unilay

Compact Stranding

Competition Transition Charge (CTC)

Compliance Voltage

Compression Splice

Concentric Stranding

Conductivity

Conductor

Conductor Shield

Conduit

Conduit Fill

Conjunctive Test

Constant Current Charge

Constant Potential Charge

Continuous Load

Continuous Rating

Conversion Coefficient

Copolymer

Core Balance Current Transformer

Core Loss

Corona Discharge

Coulomb

Counter EMF

Counting Relay

CPE

Creepage Distance

Crest Value

Cross-Linked Polyethylene (XLPE)

CSP

CST

Cu

CU (Lighting)

Current

Current Limiting Fuse

Current Transducer

Current Transformer

Current Transformer Ratio

Cut Off Voltage

Cutoff (Lighting)

Cutoff Angle (Lighting)

Cycle

D

DA Bolt

De-energized

De-ionization Time

decibel

Deep Discharge (Battery)

Delta-Wye

Dependent Time Measuring Relay

Depth of Discharge

Derating

DES

Design Load

Device Control Point

DFT

Dielectric

Dielectric Constant

Dielectric Grease

Dielectric Strength

Dielectric Test

Dielectric Withstand

Dielectric Withstand Voltage Test

Digital Signal Processing

Digital Signal Processor

Dip Tolerance (Lighting)

Dipole Antenna

Direct Current

Direct-on-Line

Directional Relay

Discharge (Battery)

Discharge Current

Discharge Rate (Battery)

Disconnect Switch

Distortion Factor

Distribution Automation

Distribution Transformer

Distribution Voltage

Disturbed Network Protocol

DMZ

Double Arming Bolt

Draw-Lead

Drop-Out

Dry Charge (Battery)

Dry-Type Transformers

DTIM

Dual Voltage Switch

Dual Voltage Transformer

Duct Bank

E

Earth Fault Protection System

Earthing Transformer

Eddy Current

EEI

EERA

Effective Internal Resistance (Battery)

Effectively Grounded

Electrical Hazard

Electrical Relay

Electrically Safe Work Condition

Electrolyte (Battery)

Electromechanical Relay

Electromotive Force

Embedded Generation

EMTP

End Point Voltage

End-of-Discharge Voltage

End-Point Voltage

Energy Management System

Entrainment (Battery)

EPDM

EPR

EPROM

Eutectic

Exciting Current

Extra High Voltage

F

FA

Farad

Fault Close Rating

Fault Current

Fault Indicator

Federal Energy Regulatory Commission (FERC)

Feeder

Ferro resonance

Fiducial Value

Field Current

Flame Resistance

Flash Hazard

Flash Hazard Analysis

Flash Protection Boundary

Flash Suit

Flashover

Float Charge

Flooded Cell

Fluorescent Lamp

Foot-candle (fc)

FPI

Frequency

Frequency Transducer

Fulgurate

Full Scale Output

Fuse

Fuse Arcing Time

Fuse Link

Fuse Melt Time

Fused Cutout

G

Gassing (Battery)

Generator Step-Up (GSU)

GF

GIS

GMT

Gnd

Ground

Ground Fault

GTO

Guy Strain Insulator

H

H2

Hard Drawn

Harmonic

Harmonic Distortion

Hazard Risk Category

Heat Run Test

Helical

Henry

Hertz

HID

High Intensity Discharge (HID) Lamp

High Pressure Sodium (HPS) Lamp

High Voltage

High Voltage System

High-speed reclosing

Hookstick

Horsepower

HPS

HRC

HSR

HV

Hybrid Photovoltaic System

Hydrometer

I

I.D.M.T.

I2t

ICEA

ICT

IEC

IED

IEEE

IESNA

IGBT

ILL (Lighting)

Impedance

Impulse Test

Incandescent Lamp

Incident Energy

Independent Time Measuring Relay

Induced Current

Induced Voltage

Inductance

Influence Quantity

Initial Lamp Lumens (Lighting)

Inrush Current

Insolation

Instantaneous Relay

Instrument Transformer

Insulated Gate Bipolar Transistor

Insulation

Intermediate Class Arrester

Internal Impedance (Battery)

Internal Resistance (Battery)

International System of Units (SI)

Interrupter Switch

Interrupting Medium

Interrupting Rating

Interruption

Intrinsic Error

Inverse Time Delay Relay

Inverter

ISM Band

Isolation Link

Isotropic Antenna

J

Joule

K

kcmil

Kilowatt

Kilowatt Hour

Knee-Point e.m.f.

kVA

KVAR

L

Ladder Diagram (LD)

Lag

Lamp Lumen Depreciation, LLD (Lighting)

Lateral Circuit

Lateral Light Distribution

Lay Direction

Lay Length

LCD

LDC

LDD

Lead

Lead Acid (Battery)

Lead Acid Battery

Lead Dioxide (Battery)

Lead Sulfate

LED

Light Loss Factor (LLF)

Lighting Arrester

Lighting Maintenance Factor (MF)

Lightning & Switching Impulses

Limit Switch

Limited Approach Boundary

Limiting Value of the output current

Line Hose

Line Traps

LLF (Lighting)

Load

Load break

Local Control Mode

Local Roadway (Lighting)

Long Distribution (Lighting)

Long-Term Stability

LPW

Lumen

Lumens Per Watt (LPW)

Luminaire

Luminaire Dirt Depreciation (LDD)

Luminaire Dirt Depreciation Factor (LDD)

Luminance

Lux

LV

M

MAC address

Main Protection

Maximum Permissible Values of the input current and voltage

MCC

MCCB

Mean-Sensing Transducer

Measuring Element

Measuring Range

Measuring Relay

Medium Distribution (Lighting)

Medium Voltage

Megohmmeter

Melt Time

Mercury Vapor Lamp (MV)

Metal Clad (Switchgear)

Metal Enclosed (Switchgear)

Metal Halide Lamp (MH)

Metering (non-tariff)

Metering (tariff)

MHR (Lighting)

Mid Point Sectioning Substation

Mobile Transformer

Momentary Rating

Mortality Curve

Motion Resistant Conductor

MOV

Multi-Crystalline (Photovoltaic)

Multi-element transducer

Multi-section transducer

Multi-shot reclosing

MVA

MW

MWH

N

Nameplate Rating

NEC

NEMA

Neutral Conductor

Neutral Ground Reactor

Neutral Grounding Resistor

NFPA

NFPA 70E Standard

Nickel Cadmium Battery

Nominal Capacity (Battery)

Nominal Voltage

Nominal Voltage (Battery)

Non-cutoff (Lighting)

Non-Halogen Ethylene Copolymers

Notching Relay

NPS

O

Off Peak Power

Off-Load Tap Changer

OHL

Ohm

Ohm’s Law

Oil Breakers

Omni directional Antenna

On Load Tap Changer

One-Axis Tracking (Photovoltaic)

Open Link

Open-Circuit Voltage (Battery)

Operating Current

Operating Current (of a relay)

Operating time Characteristic

OPGW

OSHA 29 CFR 1910, Subpart S-Electrical

OSI 7-layer model

Outage

Output common mode interface voltage

Output Current of a transducer

Output Load

Output series mode interface voltage

Output Span

Over current Relay

Overcharge (battery)

Overshoot Time

Oxygen Recombination

P

Pad Mounted Transformer

Parallel Connection

Parametric Conjuctive Test

Parking Bushing

Parking Stand

Pasted Plate (Battery)

PCB

PCC

PE

Peak to Peak

PED

Phase Angle

Phase Angle Transducer

Phase Rotation

Photovoltaic

Photovoltaic Array

Photovoltaic Cell

Photovoltaic Concentrator

Photovoltaic Conversion Efficiency

Photovoltaic Efficiency

Photovoltaic Module

Photovoltaic Panel

Photovoltaic Stand-Alone System

Photovoltaic System

Pick up ratio

Pilot Channel

Pilot Line

Plante Plate (Battery)

PLC

Plug Setting Multiple

Pocket Current Transformer

Point of Common Communication

Polarity

Pole Spacing (Lighting)

Polyethylene

Polymer Concrete

Polyphase

Polyvinyl Chloride

Potential

Potential Transformer

POW

Power Electronics Device

Power Factor

Power Line Carrier Communication

Power Transformer

Prohibited Approach Boundary

Protection Relay

Protection Scheme

Protective Device Numbers, ANSI

R

Rated Capacity (Battery)

Rated Lamp Life

Rated Output

Ratio Correction

RCD

Reactance

Reactive Power

Real Power

Recloser

Recombination (Battery)

Regulating Transformer

Regulator

Relay

Remote Control Point

Resealable Cap (Battery)

Residual Current

Residual Voltage

Resistance

Restricted Approach Boundary

Reversible Output Current

Ridge Pin

Ripple

Ripple Content of the Output

RJ-11

RJ-45

RMU

ROCOF

Root-Mean-Square

RTU

S

S.I.R.

SAIDA

SAIFI

SCADA

Scaling Resistor

SCP

SCS

Sealed Cell (Battery)

Self Discharge (Battery)

Semi-cutoff (Lighting)

Separator (Battery)

SER

Series Connection

Service Entrance Cable

Service Life (Battery)

SEU

SFC

Shock Hazard

Short Circuit

Short Distribution (Lighting)

Shotgun Stick

Sidewall Pressure

Simplex Communications System

Single Element Transducer

Single-Phase

Single-Shot Reclosing

Sintered Plate (Battery)

SOTF

Spacing-to-Mounting Height Ratio

Specific Conjuctive Test

Specific-Gravity (Battery)

Split Phase

Spread Spectrum

Spring Winding Time

Stability Limits of a Protection System

Stability of a Protection System

Stability of Transducer

Stage 3 Emergency

Standard calibration

Starting Current

Starting Relay

Starved Cell (Battery)

STATCOM

Static Relay

Static Var Compensator

Static Wire

STC

Stranded Conductor

Stringing Block

Sub-Transmission System

Substation Configuration Language

Sulfation (Battery)

Sulfur-Hexafluoride (SF6)

Super Draw Lead

Surge Withstand

Surge Withstand Capability (swc) Test

Sweeling (Battery)

Switch, Network

Switchgear

Switching Surges

System Disturbance Time

System Impedance Ratio

T

Tap Changer

TC57

Tensile Strength

Thermoplastic

Thermoset

Thin Film (Photovoltaic)

Three-Phase

Through Fault Current

Thumper

Time Delay Relay

Tow Axis Tracking (Photovoltaic)

TPI

Tracking Array (Photovoltaic)

Transducer

Transducer Error

Transducer Factor

Transducer with Live Zero

Transducer with Suppressed Zero

Transformer

Transformer Insulation

Transformer Ratio

Transformer Voltage Regulators

Trickle Charge (Battery)

True RMS Amps

True RMS volts

TRXLP

Tubular Plate (Battery)

Tungsten Halogen Lamp

TW

Twisted Pair

U

UCA

Ultra High Voltage (UFV)

Unbalanced Loads

Underground Residential Distribution

Underground Utility Structure

Unidirectional Unit

Unit Electrical Relay

Unit Protection

Universal Bushing Well

Unrestricted Protection

UPS

URD

USE

USMA

V

V

VA

VAC

Vacuum Circuit Breakers

Vacuum Interrupter

Valve Regulated Sealed Cell (Battery)

Vapor Phase

VCB

VDC

Vector Group Compensation

Veiling Luminance

Vent Cap (Battery)

Vent Valve (Battery)

Venting (Battery)

Volt

Voltage Class

Voltage Drop

Voltage Rating

Voltage Regulation

Voltage Sag

Voltage Spread

Voltage Swells

Voltage Transducer

Voltage Transformer

Voltage Transformer Ratio

Voltage Transients

Voltage Withstand Test

VR Cable

W

Watt

Watt-Hour

Western Underground Committee

Wire Lubricant

Wye

X

XHHW-2

XLPE

Z

Zero Crossing