1、电气英语证书考试(PEC)-Glossary of Electrical Engineering and Automation100BaseT - A synonym for the Fast Ethernet network standard. The “100“ refers to a maximum data-transfer rate of 100 megabits per second over twisted pair, copper wire.10BaseT - A synonym for the Fast Ethernet network standard. The “10“
2、refers to a maximum data-transfer rate of 10 megabits per second over twisted pair, copper wire.10K - A grade level Box or Cover rating. See “Incidental Light Traffic“.1A - 1 Normally Open1B - 1 Normally Closed20A - A California ruling that has the investor owned utilities performing the under-groun
3、ding of electrical cables. The funds to perform the work are derived from rates and go into a sinking fund that is used at the discretion of the municipality the electric20B - A California ruling that has the investor owned utilities performing the under-grounding of electric cables. The funds to pe
4、rform this work are derived from a combination of rates and the developer of the land the line is on. This work is done at the di20C - A California ruling that has the investor owned utilities performing the under-grounding of overhead electrical cables. The funds to perform this work are derived fr
5、om the developer of the land the line is on.20K - A grade level Box or Cover rating. See “Occasional Traffic“.2S1W - Two Speed, 1 Winding (motor).2S2W - Two Speed, 2 Winding (motor).3 Phase - See “Three Phase“ and “Polyphase“600 Volt - Electrical systems, cables or service designed to be operated un
6、der 1000 Volts.600V-UD - 600 Volt Underground Distribution Cable.802.11a - A specification for a wireless LAN that operates in the 5GHz frequency range and provides a data transmission rate of 54Mbps using spread spectrum technology.802.11b - A specification for a wireless LAN that operates in the 2
7、.4GHz range and provides a data transmission rate of 11Mbps using spread spectrum technology. This specification was known as Wi-Fi but the term now applies to 802a and 802g as well.802.11g - A specification for a wireless LAN that operates in the 2.4GHz frequency range and provides a data transmiss
8、ion rate, over short distances, of 54Mbps using orthogonal frequency division multiplexing (OFDM) technology.802.1x - A security standard for wired and wireless LANs.AA - 1) Amperes; Amps. 2) Area. For cables Area is expressed in Circular Mils.A-H - Ampere-HourA/D Conversion - The process of convert
9、ing an analogue signal into an equivalent digital one utilizing an A/D converter.AA - 1) The Aluminum Association. 2) Refers to All Aluminum as in All Aluminum Conductor.AAAC - All Aluminum Alloy ConductorAAC - All Aluminum Conductor.AAC/TW - All Aluminum Conductor, Trapezoidal-Shaped Aluminum Stran
10、ds.AASHTO - American Association of Safety Highway Traffic OfficialsAbsorbed Glass Mat - Absorbed Glass Mat, also known as AGM, is a newer type of battery construction that uses saturated absorbent glass mats rather than gelled or liquid electrolyte. It is somewhat more expensive than flooded (liqui
11、d) type, but offers good reliability and faAC - See “Alternating Current“ACAR - All Aluminum Conductor, Aluminum Alloy Reinforced.ACB - Air Circuit BreakerAccess Point - A wireless networked device usually connected to a wireless LAN used to access the wired LAN.Accuracy - The degree of uncertainty
12、for which a measured value agrees the ideal value.Accuracy Class - A number used to indicate the accuracy range of a measurement transducer, according to the defined standard.ACSR - Aluminum Conductor Steel Reinforced.ACSR/AW - Aluminum Conductor, Aluminum Clad Steel Reinforced.ACSR/TW - ACSR conduc
13、tor made using Trapezoidal Wire construction.ACSS - Aluminum Conductor Steel Supported. This is a conductor that is generally used for overhead transmission construction. ACSS is often preferred over ACSR because of its superior sag characteristics.ACSS/AW - Aluminum Conductor, Aluminum Clad Steel S
14、upported.ACSS/TW - ACSS conductor made using Trapezoidal Wire construction.Active Material (Battery) - Material which reacts chemically to produce electrical energy when the cell discharges. The material returns to its original state during the charging process.Active Power - A term used for power w
15、hen it is necessary to distinguish among Apparent Power, Complex Power and its components, and Active and Reactive Power.Adjustment - The operation intended to bring a transducer into a state of performance suitable for its use.Admittance - The reciprocal of Impedance (1/Z).ADSL - Asymmetric Digital
16、 Subscriber Line. ADSL uses standard phone lines to provide high speed data communications. ADSL upstream speeds (from the user) normally top out at 128Kbps and downstream (to the user) at no more than 1.5Mbps. A separate phone line iAEIC - Association of Edison Illuminating Companies. www.aeic.orgA
17、eolian Vibration - A natural forced vibration caused by wind flowing over a conductor. This occurs at alternate wind induced vortices and at wind speeds typically at 8 to 12 MPH. Contact Young An electric current flowing at the rate of one coulomb per second.Ampere-Hour - The use of one Ampere for o
18、ne hour.Ampere-hour capacity (storage battery) - The number of ampere-hours that can be delivered under specified conditions of temperature, rate of discharge, and final voltage.Ampere-hour meter - An electric meter that measures and registers the integral, with respect to time, of the current of a
19、circuit in which it is connected.Anchor - A device that supports and holds in place conductors when they are terminated at a pole or structure. The anchor is buried and attached to the pole by way of guy wire to counteract the mechanical forces of these conductors.Anneal - The process of controlled
20、heating and cooling of a metal. In wire and cable products, copper and aluminum are annealed to increase flexibility while maintaining adequate strength.Anode - 1) The positive electrode that emits positive ions and attracts negative ions, within a voltaic cell or other such device. 2) The positive
21、pole of a battery.ANSI - American National Standards Institute. ANSI is located at 1430 Broadway, New York, NY 10018.Antenna Gain - An antennas transmission power, provided as a ratio of its output (send) signal strength to its input (receive) signal strength, normally expressed in dBi. The higher t
22、he dBi, the stronger the antenna.Anti-Pumping Device - A feature incorporated in a Circuit Breaker or re-closing scheme to prevent repeated operation where the closing impulse lasts longer than the sum of the relay and CB operating times.Apparent Power (volt-amps) - The product of the applied voltag
23、e and current in an ac circuit. Apparent power, or volt-amps, is not the true power of the circuit because the power factor is not considered in the calculation.AR - Automatic Recloser.Arc - A discharge of electricity through air or a gas.Arc Flash - An arcing fault is the flow of current through th
24、e air between phase conductors or phase and neutral or ground. An arcing fault can release tremendous amounts of concentrated radiant energy at the point of the arcing in a small fraction of a second resultArc Thermal Performance Value - Maximum capability for arc flash protection of a particular ga
25、rment or fabric measured in calories per square centimeter. Though both garments and fabrics can be used for protection a garment made from more than one layer of arc flash rated fabric will haArcing Time - The time between instant of separation of the CB contacts and the instant of arc excitation.A
26、rmor - An outer metal layer applied to a cable for mechanical protection. Armor is comprised of factory formed wire, designed to be applied to a range of conductor sizes. Preformed Line Products manufacturers Armor.Armor Rod - An outer metal layer applied to a cable for mechanical protection. Armor
27、Rods are comprised of factory formed wire, designed to be applied to a range of conductor sizes. Preformed Line Products manufacturers Armor Rods.Array - For photovoltaic systems, a number of photovoltaic modules connected together to provide a single electrical output. Also see “Photovoltaic Array“
28、.Arrester - Short for Surge Arrester, a device that limits surge voltage by diverting it.Askeral - A generic term for a group of synthetic, fire-resistant, chlorinated aromatic hydrocarbons used as electrical insulated fluids.ASTM - American Society for Testing and Materials. ASTM is located at 1916
29、 Race Street, Philadelphia, PA 19103.ATC - Available Transfer CapacityATP - Alternative Transient ProgramAutomatic line sectionalizer - A self-contained circuit-opening device that automatically opens the main electrical circuit after sensing and responding to a predetermined number of successive ma
30、in current impulses.Automatic Recloser - An automatic switch used to open then reclose following an over current event on a distribution voltage (medium voltage) line.Autonomous Photovoltaic System - A stand-alone Photovoltaic system that has no back-up generating source. The system may or may not i
31、nclude storage batteries. Most battery systems are designed for a certain minimum number of days or operation before recharging is needed should sufficieAutotransformer - A transformer in which at least two windings have a common section. They are use to either “buck“ or “boost“ the incoming line vo
32、ltage.Auxiliary Power - The power required for correct operation of an electrical or electronic device, supplied via an external auxiliary power source rather than the line being measured.Auxiliary Relay - An all-or-nothing relay energized via another relay. An example is a measuring relay, for the
33、purpose of providing higher rated contacts, or introducing a time delay, or providing multiple outputs from a single input.Average Maintained Foot-candles (Lighting) - (ILL x CU x LLF)/(PS x RW)AWG - American Wire Gauge.Azimuth - The angle between true north and the projection of a surface normal to
34、 the horizontal plane, measured clockwise from the north. As applied to a Photovoltaic array, 180 degrees azimuth means the array faces south.BBaker Board - A insulated platform used to work above the ground on a pole.Balanced Load - Refers to an equal loading on each of the three phases of a three
35、phase system.Balanced polyphase system - A polyphase system in which both the currents and voltages are symmetrical.Ballast - A device that by means of inductance, capacitance, or resistance, singly or in combination, limits the lamp current of a fluorescent or high intensity discharge lamp. It prov
36、ides the necessary circuit conditions (voltage, current and wave form) for startBandwidth - The data carrying capacity of a transmission path, measured in bits or bytes per second.Bank - A group of electrical devices, usually transformers or capacitors, connected in a way to increase capacity or to
37、inter connect as three-phase.Basic impulse level (BIL) - A reference impulse (voltage) insulation strength expressed in terms of the peak value of the withstand voltage of a standard impulse voltage wave. It is used to express the ability of electrical equipment such as transformers to withstand cer
38、tain levelsBasic Insulation Level - A design voltage level for electrical apparatus that refers to a short duration (1.2 x 50 microsecond) crest voltage and is used to measure the ability of an insulation system to withstand high surge voltage.Battery - A combination of two or more chemical cells co
39、nnected together electronically to produce electrical energy.Battery Tray - A contained with a base and walls for holding several cells or batteries.Bay-O-Net - A fusing device frequently used to protect transformers and downstream devices. A Bay-O-Net fuse may include a Partial Range Current Limiti
40、ng Fuse in series with n under oil fuse link.Beacon - In wireless networking, a beacon is a packet sent by a connected device to inform other devices of its presence and readiness.Beam Spread - With regard to outdoor light, the angle between the two directions in a plane in which the intensity is eq
41、ual to a stated percentage of the maximum beam intensity. The percentage is typically 10% for floodlights and 50% for roadway luminaries.Belt - Refers to a linemans climbing belt.Bias Current - The current used as a bias quantity in a biased relay.Biased Relay - A relay in which the characteristics
42、are modified by the introduction of some quantity, and which is usually in opposition to the actuating quantity.Bikeway (Lighting) - Any road, street, path or way that is specifically designated as being open to bicycle travel, regardless of whether such facilities are designed for the exclusive use
43、 of bicycles.BIL - 1) See Basic Insulation Level. 2) See Basic Impulse Level.Blackout - The complete interrupting of load to an electric utility customer or group of customers.Blowing - The act of installing fiber optic cable into a duct using air pressure.Bluetooth - A wireless computing and teleco
44、mmunications specification that defines how mobile personal computing devices work with each other and with regular computers and phone systems within a close range.Bonding - The joining of metallic parts to form an electrically conductive path that will ensure electrical continuity and the capacity
45、 to conduct any current to be present in a safe manner.Boomer - A lineman that moves from job to job.Boost Charge - A charge applied to a battery which is already near a state of full charge, usually of short duration.Booster Transformer - A current transformer whose primary winding is in series wit
46、h the catenary and secondary winding in the return conductor of a classically-fed A.C. overhead electrified railway.Breakdown Voltage - The voltage at which a dielectric material fails.Breaker - See “Circuit breaker“.Brownout - Refers to a reduction of voltage on the system. This dims the lights as
47、a means of conserving energy.Buck - The act of lowering the voltage.Bucket - A basket or platform that supports one or more linemen attached to a boom of a truck.Bucket Truck - An aerial lift truck used to lift men high enough to work on overhead lines.Building Wire - Conductors and cables used in c
48、ommercial building construction.Bulb - The outer enclosure of a light source; usually glass or quartz.Bulb Envelope Lighting) - The outer enclosure of a light source; usually glass or quartz.Bull Line - Heavy line used to pull wire or cable into a conduit or into an overhead configuration.Bull Wheel
49、 - A reel device used to hold tension during the wire installation process.Bunched Stranding - A term applied to a number of wires twisted together in one direction in one operation without regard to their geometric arrangement.Bundle - Multiple cables used to form one phase of an overhead circuit.BURD - Buried Urban Residential Distribution.Burden - Load imposed by an electronic or electrical device on the measured input circuit, expressed in volt-amps.Buried Urban Residential Distribution - Refers to the system of electric utility equipment installed below grade.Bus - A conductor, whi
