Hot spot article

　　Now many large enterprises are to buygenerators to supply enough power. Then the noun generators have? How toexplain? The following Hidier power technology experts to introduce in detail:

　　Indicator

　　Indicator as an accessory device used forremote display system status of an operating component. The indicator isusually used in monitoring equipment is not in the application of equipment onsite. Application of America National Fire Protection has some specialAssociation requirements of indicator in some industries, such as hospitals.

　　Active power

　　Active power (KW), refers to the actualsupply generator to the load power, provided by its generator engine, limitedby the horsepower of the engine. The heating and the drive motor rotation arecompleted by active power.

　　Air circuit breaker

　　Air circuit breaker’sfunction is when the current exceeds the circuit breaker over-current trip setvalue automatically open. Air is the medium of electrical insulation betweenlive parts and grounded metal parts.

　　Damping coil

　　Damping coil synchronous AC generator isthat the conductors embedded in the rotor poles, they were at the poles by endrings or end plate connected, the main function is to reduce waveformdistortion caused by the change of load.

　　Current carrying capacity

　　Current carrying capacity is the conductorin amperes as defined safe current carrying capacity.

　　Ampere

　　The ampere is a unit of electric current.Resistance voltage of 1 volts is applied to the 1 ohm can produce electriccurrent of 1 amps.

　　Alternating current

　　Alternating current means between themaximum current in the positive and negative frequency changes in specificfrequency, usually 50 or 60 hertz.

　　Sound materials

　　The sound material, in particular means isto sound absorption or sound insulation properties of materials.

　　Apparent power

　　Apparent power is the product of current andvoltage, denoted by KVA. It is real power (KW) divided by the power factor.

　　Armature

　　Armature AC generator is the assembly ofwindings and metal core, the inductive voltage. It is the stationary part of arotating magnetic field generator (stator).

　　Backup protection device

　　Backup protection is the protection deviceafter other protective devices have failed to operate or failure.

　　Bandwidth

　　The amount of data is that can betransmitted in a fixed period of time. In digital equipment is shown in bits /sec or word / seconds, in the simulation (digital) equipment in cycles persecond or hertz.

　　Basic load

　　Base load is that load demand in that partof the same, is the base of the building demand curve.

　　Baud rate

　　Serial data transmission rate, approximatelyequal to the number of bits transmitted per second. Bits per second can beexpressed by BPS, KBPS said kbit / s..

　　Binding

　　The process of making the logicalconnections and network (also called connecting), including the input andoutput variables using LONWORKS software.

　　2 hexadecimal numbers

　　Black start

　　Black Start refers to the starting of theinternal power supply system, without the assistance from external power.

　　Boolean type

　　A logical system used to express one of twostates, such as on or off (yes or no, 1 or 0).

　　Bus capacity

　　Bus capacity is not suppressed in thegenerator frequency, the maximum load driven.

　　Current transformer

　　The current transformer is a kind ofinstrument transformer, usually with the current meter, control circuit,protection relay supporting the use of.

　　Circuit

　　Circuit is a current through the electricpotential (voltage) path.

　　The circuit breaker

　　A circuit breaker is a protection device,when the current exceeds a certain value for a specified time, it canautomatically cut off the current. (see air circuit breaker, the main switches,molded case circuit breaker).

　　Harmonic current

　　Harmonic current circulation is generated bythe parallel power between different voltage waveform or nonlinear loadoperation.

　　Continuous load

　　Continuous load current is expected in 3hours or more (as defined by the NEC) domestic demand to maintain maximum load.

　　Electric current

　　Current is the flow of electric charge, theampere as unit.

　　Cycle

　　Cycle refers to the alternating current orvoltage from zero to a positive maximum to zero again, then from zero to a negativemaximum to zero again a reciprocal process; and the frequency is the number ofcycles per second can be completed.

　　Dead bus

　　Dead bus refers to the parallel connectionbetween the generator output power connection not charged in the state. The bushere referred to may be rigid solid bus bars, may also be insulated flexiblecables.

　　Delta connection

　　Delta connection refers to a three phaseconnection in the next phase, phase of end to end, forming a triangular Greekletter DELTA, load line is connected to the corners of the triangle.

　　Differential relay

　　A protective device, the differential relayis provided by two different positions of current transformer in the systemfeedback information. Differential relay compares the current, if there aredifferent that a fault in the zone of protection. These devices are typicallyused to protect windings in generators or transformers.

　　Digital master control

　　Digital master control device is designed tocontrol the equipment of power system. In Cummins switchgear in digitalcontroller is optional.

　　Direct Current

　　DC is not current reversals in polarity.

　　Distributed control system

　　Distributed control system is composed ofdistributed in different locations of nodes that interact to form. Each nodehas a smart, can operate to control each system. Communication betweendifferent parts of the system state and control information exchange to form adistributed control system, communication within such a system is to point topoint, a system different from all of the communications between control andpart by a central controller complete.

　　Distribution circuit breaker

　　A distribution circuit breaker is a deviceconnected to a main distribution equipment overload and short currentprotection of loads.

　　Droop load sharing

　　Droop load sharing is a method of two ormultiple unit load allocation. The governor of each parallel sets have the samedroop. From no load to full load speed drop is usually two hz.

　　Efficiency

　　Efficiency is the ratio of energy output toenergy input, such as the electrical energy input to a motor and the output ofthe ratio between the bearing of the motor mechanical energy.

　　Emergency system

　　The emergency system is required accordingto relevant laws and regulations, independent power generation equipment toprovide power for the device or system that might endanger the safety of lifeor property losses.

　　Energy

　　Energy to electrical energy, heat, light andother forms, can work, can also be converted from one form to another, such asthe generator can convert mechanical energy into electrical energy. Typicalunits of energy are: kW / h, British thermal units, HP / h, J, card etc..

　　Fault

　　In the power system fault refers to anycurrent ran outside of the normal circuit.

　　Feeder circuit breaker

　　See "a distribution circuitbreaker".

　　Fiber optic cable

　　Fiber optic cable is refers to the use ofglass or plastic threads (fiber) to transmit data. Fiber optic cable is abundle of can be used to transfer the glass or plastic modulated into lightinformation tube. Compared with metal wire, cable is characterized by greaterbandwidth, light weight, can transmit more data, better anti-jammingperformance, and the data is in digital form rather than analog transmission. Inthe field of LAN is used more and more widely.

　　First start sensor

　　First start sensor is an electronic deviceused in some paralleling equipment, function is the voltage, frequency sensinggenerator set and bus, determine which units in a "black start"signal first to close to the bus.

　　Frequency

　　The frequency is the periodic change ofthings (such as AC voltage and current and so on) the number of complete cyclesin the unit time, common Hertz (HZ) or cycles / second (CPS).

　　A frequency adjust potentiometer

　　Frequency adjust potentiometer is used tomanually input unit with the bus frequency synchronization. When the unit is inparallel, potentiometer can be adjusted for unit output value.

　　Frequency regulation

　　Frequency regulation is a measure that thedifference between no-load and full load frequency as a percentage of full loadfrequency.

　　Gateway

　　The gateway is between two differentcommunication protocol interface, the network gateway module (NGM) provides apersonal computer can understand communication protocol. Other gateway devicesmay be used in our LONTALK protocol and other systems (such as SCADA orbuilding automation system) interface between devices. When the drive SCADA orbuilding automation system is without LONTALK, the gateway is essential.

　　Generator

　　The generator is put (rotation) mechanicalenergy into electrical energy.

　　Governor

　　A governor is a device mounted on theengine, to maintain a constant engine speed by controlling the amount of fuelin different load conditions. The governor must have speed adjustment(generator frequency) and speed droop adjusting (no load to full load)function.

　　Power grid

　　Power refers to the power transmissionsystem of power plant.

　　Grounding

　　The ground is connected to an electricalcircuit and the earth or the ground conductor, either intentional oraccidental.

　　Ground fault protection

　　When there is an electrical fault betweenone or more of the phase conductors and ground, ground fault protection to warna circuit breaker or alarm. This function can be integrated on the circuitbreaker.

　　Hertz

　　Hz is the unit of frequency, for cycles persecond (CPS).

　　Branch device

　　A branch in a network or sub - networkequipment and contacts, contains a lot of port, commonly used to connectsegments of a lan.

　　Travel car

　　Hunting is a cause changes in the loadfrequency, voltage is higher or lower than the expected value, can not achievethe stable phenomenon. It is caused by insufficient damping.

　　Insulation

　　Insulation is non-conductive material, usedto prevent leakage of electric current from a conductor. According to thedegree classification of maximum sustained heat insulators used in powergenerating equipment, a variety of grades.

　　Lagging power factor

　　The lagging power factor in AC circuits(less than 1) is caused by inductive loads, such as motors and transformers,which cause the current to lag behind the voltage. (Referring to the powerfactor)

　　Leading power factor

　　Leading power factor in AC circuits (0 TO-1.0) is caused by the synchronous motor capacitor load or overexcite, causethe current to lead the voltage. (Referring to the power factor)

　　Line voltage

　　The line voltage is the voltage between anytwo phases of an AC generator.

　　Phase voltage

　　In the three-phase four wire Wye connectedgenerator, phase voltage is the voltage between each phase and three-phaseconnection.

　　Load demand

　　Load demand is a paralleling systemoperating mode, the output power system monitoring power unit, according to thenumber of system function of the total load operation of the unit. The purposeof load demand controls is to reduce fuel consumption, less failure ofreciprocating diesel generator set due to the low load.

　　Load factor

　　The load factor is the ratio of the averageload.

　　Unload

　　In the overload of the system bus, parallelto the total load system is reduced as unloading, so that the most criticalload.

　　LAN

　　Local area network (LAN) refers to cover arelatively small area of computer networks, most LANs are confined to a singlebuilding or group of buildings.

　　Low voltage

　　AC system voltage from 120 to 600 VAC isreferred to as the low pressure.

　　The main switch

　　The main switch is a circuit breaker at theinput or output of the bus, all currents flow from it through. The main switchis usually mounted on the generator set, used to cut off the output current.Main breakers provide overcurrent protection, power distribution panel orequipment disconnection point.

　　Electric Supply

　　Electric Supply is America extensivelyoutside of the title of the normal power service.

　　The main control

　　The main control measure control equipmentparallel system typical, paralleling system and the interface between theelectric facilities.

　　MV

　　AC system voltage from 601 to 15000 VAC isreferred to as the mv.

　　Modules

　　Modules are also called contact orcomponents, such as genset communication module (GCMS), control communicationmodules (CCMS) and digital input / output module (DIMS).

　　Molded case circuit breaker

　　Molded case circuit breaker automaticallyinterrupts the current flowing through it when the current exceeds the triprating. It refers to the use of plastic insulator as the housing of the device,used to separate between conductors and ground metal parts. Molded case circuitbreakers usually contain thermal magnetic trip units, and molded case circuitbreaker larger sizes can be equipped with solid state trip sensors.

　　Network

　　In the common medium collection of nodescommunicate with each other is a network.

　　Network data

　　Is called the network data transferinformation between contacts. POWERCOMMAND network so that the signal is notaffected by the polarity effect using MANCHESTER coding, signal by thetransformer coupled to the network data line speed is 78 KBPS.

　　Gateway module

　　The network module is between a modem or PCand the network wire interface. Gateway to connect with the UTP line, andprovides an RS-232 port for connection to a modem or PC.

　　The zero line current

　　The zero line current refers to the currentthrough the zero line parallel system, in terms of circulation current or crosscurrents often mention the term.

　　Contact

　　Contact with neuron chip module, can throughthe network data and other communications module. Some modules are contact,such as genset communication module (GCMS) and control communication modules(CCMS), and those who can only receive information, but not with otherfacilities to achieve communication module are not nodes, such as network annunciatormodule (NAM).

　　Interface

　　Device external interfaces, is used fornetwork connection or other media.

　　Power factor

　　Power factor is the active power circuit(KW) and apparent power (KVA) the cosine of the angle between the.

　　Constant load

　　Constant load refers to the generator can beused for a long time and continuous operation. Usually apply to some placeswithout city electricity supply, generators as a prime power.

　　Priority control

　　Priority control is when the output powerdemand is greater than the total load generator, first to meet the power demandof the load.

　　Agreement

　　Some rules of communication of two or morefacilities comply with the common, in the network is often called the"language".

　　Radio interference

　　Radio interference refers to theinterference power received by the radio signal.

　　Backup system

　　A standby system is an independent powersupply system, when the normal power failure, the standby system will run.

　　Star connection

　　See Y connection.

　　Starting current

　　When the initial current of the motor fromstandstill when the value is the starting current.

　　Mutation

　　Mutation is the sudden rise in voltage in asystem, usually caused by load disconnect.

　　Surge suppressor

　　Surge suppressor is able to inhibit theinstant high voltage equipment, used to protect other equipment destroyed bythe transient voltages.

　　Sync check relay

　　Sync check relay is an electrical devicethat monitors the phase relationship between two voltage sources, if thevoltage source in the relationship between parameters within a predeterminedrange, it will send corresponding signal.

　　Synchronizer

　　A synchronizer is an electronic device thatmonitors the phase relationship between two voltage sources, it sends a signalto an engine governor, to promote the turbine and the system bus tosynchronize.

　　Synchronous generator

　　A synchronous generator is an AC generatorhaving a DC exciter. Synchronous generators are used as emergency powerindependently, and can also be other synchronous generators and the utilitysystem.

　　Terminator

　　Terminator is a resistive load placed at theend of a cable, used to prevent the data signal reflecting back into the data.

　　Transfer Switch

　　A transfer switch is an electrical devicefor switching loads between alternate power sources. An automatic transferswitch monitors, if the preferred power supply failure, it automaticallyconnects the load to the alternate source.

　　Undershoot

　　Undershoot refers to the voltage regulatoror controller responds to changes in load, the voltage or frequency drops belowthe nominal amount.

　　Electric Supply

　　Electric Supply is a commercial powersupply, power supply to all facilities from a large central power.

　　Voltage control

　　The voltage control is a rheostat that setsthe operating point of output voltage of the voltage regulator to control thegenerator in the scope of design.

　　Voltage sags

　　Voltage sag is the voltage at the loadincrease before the regulator can correct it, or voltage regulator is anoverloaded engine unloading decline.

　　Voltage regulation rate

　　Voltage regulation is a measure thatpercentage between the maximum and minimum steady-state differential voltageand rated voltage.

　　The total power output of one point meterrecording system, usually in kwh for recording unit.

　　Nonlinear load

　　Between voltage and current is loadnonlinear relationship is called the non linear function. Some common nonlinearloads are fluorescent lighting, SCR motor starters and UPS system. Nonlinear loadscause abnormal conductor heating and voltage distortion.

　　Ohm

　　The ohm is a unit of electrical resistance.1 volts through can produce 1 amperes 1 ohm resistor.

　　The single line diagram

　　The single line diagram is a path for anthree-phase power distribution system.

　　Gear failure

　　Barring failure is warning function unit,said failed to start generating units, most units have such features.

　　Overshoot

　　Overshoot refers to changes in the voltageregulator or controller response to the load, resulting in voltage or frequencyexceeds the normal value.

　　The parallel switch

　　Paralleling breaker is a circuit breakerconnected generator and emergency bus, all the individual generator synchronousrunning through it.

　　Parallel control

　　Parallel control is an electrical device forcontrol of a single generator in parallel system.

　　Peak power

　　The peak power is used to power the demandcurve, the maximum value in the electric equipment.

　　Point to point

　　Is a network operation system for point, anyfacilities can initiate information exchange.

　　Phase angle

　　Phase angle refers to the relation betweentwo different time zero point of sine wave. A full cycle to be 360 degrees, thephase angle is expressed in degrees. Two wave distance.

　　Phase sequence

　　The sequence represents the three-phasegenerator output terminal phase voltages of the order. In electric load must bechecked prior to operation of the sequence generator and electricity facilitiesof the sequence is consistent.

　　The Y connection

　　The Y connection is star connection, also isto the phases of a three-phase system according to the shape of the letter Yconnected at the center point, also can be connected to fourth (neutral) line.

　　Wattless power

　　Wattless power refers to the currentreciprocating between the induction coil motor, generator, transformer andother flow, which is also part of the electrical load. It didn't work, but alsois not the load of engine, but as a generator load, limits the capacity of thegenerator.

　　Reverse power relay

　　A reverse power relay is a relay with awattmeter, used to perceive the current direction. In the parallel units in theopposite direction (e.g., current flows back into the generator current) willstart the reverse power relay, disconnect the set and system. If a generator isnot operating, and no reverse power relay protection, operation of the unitwill drive the unit, the unit on the generator into motor operation.

　　Router

　　The router is the network informationthrough another medium (sometimes protocol) device to send out. Our networkrouter is set as a "repeater", create another channel on the mainnetwork. Each channel has a 4600 FT network bus, can accommodate 44 contact.POWERCOMMAND network can have a maximum of 20 channel.

　　Silicon controlled rectifier

　　SCR silicon controlled rectifier -- a threeelectrode solid-state device matching, only when the voltage is applied to thethird electrode (gate electrode), to ensure the current to flow in onedirection.

　　Short circuit

　　Short circuit is generally an unintendedelectrical connection between current carrying parts.

　　Shunt trip

　　Shunt trip is a circuit breaker or acharacteristics of fused switch, through the remote signal of the breaker orswitch.

　　Soft loading

　　Soft loading refers to the generating unitto increase or decrease the load should be gradual, in order to reduce thevoltage and frequency transients on the system.

　　Sound level meter

　　Sound level meter is used to measure thesound pressure level, according to the frequency of sound is divided intoseveral decibels (A, B, C). Sound level meters indicate RMS sound, unless themeasurements are suitable for instantaneous or peak.

　　Sound pressure level

　　Sound pressure level is the representationof sound in the air pressure fluctuations of. Because the ears perceive soundpressure range is large, so the use of numerical, and by 2X10-5 N/M2 (20 M PA)expressed as a ratio, which is the limit of human hearing at 1000 HZ, ismeasured in decibels (DB). Baer (ten dB) is named after Alexander Grem Baer'sname.

　　Zero sequence

　　Zero sequence is a grounding fault detectionmethod, which uses a sensor (CT) to put all the phase and neutral conductorconnected together, the sensor will be in accordance with the current groundfault circuit imbalance of proportion to produce output, and then measured by arelay to the output, and disconnect the circuit breaker or the release ofgrounding fault alarm.

　　Hidier power companies adhering to the"honesty, cooperation, innovation" business philosophy, adhere to the"green power, hidier power", to fight, and innovative spirit ofenterprise, is committed to become a world-class enterpriseinternationalization of standby power supply.