Siemens DTU3005-B Dokumentacja

1Table of ContentsIntroduction...2Monitoring and Managing Electric

10AC Voltage, Current, Current flow in AC voltage reverses direction at regularand Frequency intervals. AC voltage and current are represented by a s

11AC voltage can either be single- or three-phase. While single-phase power is needed for many applications, such as lighting,utility companies genera

12Peak-to-Peak Value The peak-to-peak value is measured from the maximum positivevalue to the maximum negative value of a cycle. If the peakvoltage is

13Average Value The average value of a sine wave is zero. This is because thepositive alternation is equal and opposite to the negativealternation. In

14Linear Loads It is important at this point to discuss the differences between alinear and nonlinear load. A linear load is any load in whichvoltage

15Crest Factor Crest factor is a term used to describe the ratio of the peakvalue to the effective (RMS) value. A pure sinusoidal waveformhas a crest

16Term ConditionVoltage FluctuationsIncrease or decrease in normal line voltage within the normal rated tolerance of the electronic equipment. Usually

17Sags and undervoltage can be caused when high current loads,such as large motors are started. Undervoltage may also occurwhen a power utility reduce

18In this illustration, however, loads are unevenly divided. A largenumber of lighting and small appliance loads are connected tophase C . This can ca

19CBEMA and IEEE The U.S. Department of Commerce, working with the ComputerBusiness Equipment Manufacturers Association (CBEMA),published a set of gui

2IntroductionWelcome to another course in the STEP 2000 series, SiemensTechnical Education Program, designed to prepare our salespersonnel and distrib

20Power Disturbance Types There are three types of power disturbances. Type Idisturbances are transient and oscillatory overvoltages lastingup to 0.5

21Review 21. ____________ is a measurement of the number ofalternations between positive and negative peak valuesin a measured amount of time.a. volta

22Frequency and HarmonicsWe learned earlier that frequency is a measurement of thenumber of times voltage and current rises and falls toalternating pe

23When a harmonic waveform is superimposed on thefundamental sine wave a distinctive waveform is produced. Inthis example, the third harmonic is seen

24Harmonic Sequence A harmonic’s phase rotation relationship to the fundamentalfrequency is known as harmonic sequence. Positive sequenceharmonics (4t

25Harmonic Effects All harmonics cause additional heat in conductors and otherdistribution system components. Negative sequence harmonicscan be proble

26K Factor K factor is a simple numerical rating that indicates the extraheating caused by harmonics. A transformer’s ability to handlethe extra heati

27Power and Power FactorLoad Types Distribution systems are typically made up of a combination ofvarious resistive, inductive, and capacitive loads.Re

28Inductive Loads Inductive loads include motors, transformers, and solenoids. Ina purely inductive circuit, current lags behind voltage by 90°.Curren

29Reactive Loads Circuits with inductive or capacitive components are said to bereactive. Most distribution systems have various resistive andreactive

3This knowledge will help you better understand customerapplications. In addition, you will be able to describe products tocustomers and determine imp

30Reactive Power Power in an AC circuit is made up of three parts; true power,reactive power, and apparent power. We have already discussedtrue power.

31Power factor can be given as a percent or in decimal format. Thefollowing table shows the power factor for a few sample angles.In purely resistive c

32Power Factor Problems It can be seen that an increase in reactive power causes acorresponding decrease in power factor. This means the powerdistribu

33The following table shows the amount of apparent power (VA =W ÷ PF) required for a manufacturing facility using 1 MW(megawatt) of power per hour for

34Power Demand Demand is the average energy consumed over a specifiedperiod of time. The interval is usually determined by the utilitycompany and is t

35Solutions As we have learned, there are a number of things that can affectpower quality. The following table provides some basicguidelines to solve

36Review 31. The second harmonic of a 60 Hz power supply is____________ Hz.2. Typically, the total harmonic distortion (THD) of avoltage waveform shou

37ACCESS SystemUp to this point we have looked at how various factors effectpower quality. The following sections will focus on componentsof the ACCES

38WinPM and SIEServeWinPM WinPM™ is supervisory software designed for monitoring andcontrol of any facility’s electrical distribution system. WinPMcan

39Analysis Power quality, such as transients, sags, swells, and harmonics,can be monitored and analyzed by viewing triggeredwaveforms, continuous data

4Monitoring and Managing Electrical Powerwith ACCESSSiemens ACCESS™ is more than just power meters, trip units,and other hardware. The ACCESS power ma

40Industrial Computer Siemens software, such as WinPM and SIEServe, will run onmost personal computers. In some applications it may bedesirable to loc

41Communication Protocols and StandardsThe ACCESS system allows a variety of devices tocommunicate electronically. In the following illustration, fore

42Loop Topology In loop topology the cable is connected in a similar manner tostraight-line topology. Rather than terminating the connection atthe far

43ModBus RTU ModBus RTU is a protocol originally developed by MODICON,which is now part of Schneider Automation. ModBus RTUprotocol has been widely us

44Local Area NetworksLocal Area Network (LAN) In any complex power monitoring system the need for rapidinformation flow is critical. Conditions at any

45Ethernet Converter The Siemens Ethernet converter connects many ACCESS fielddevices throughout a facility to a supervisory computer. TheEthernet con

46Serial CommunicationRS-232 and RS-485 are Electronic Industries Association (EIA)specifications commonly used for serial data communication.Siemens

47RS-232 uses what is referred to as an unbalanced signal orcommunication method. There is one signal wire for eachcircuit with a common return. The

48Typically, at the top level of a communication system is a hostcomputer with an RS-232 interface. The host computer mayhave to communicate with an R

49Using the Isolated In the following illustration a computer communicates withMuli-Drop Converter various ACCESS field devices through an RS-232 inte

5Electrical Power DistributionBefore discussing the Siemens ACCESS system anunderstanding of the production, distribution, and use of electricpower is

50Modem Modems are electronic devices used for sending and receivingdata over long distances. The Siemens ACCESS system alsosupports data communicatio

51DTU3005 The DTU3005 is a multiple-function data transfer unit, whichacts as an intelligent device to request information from up to32 ACCESS devices

52Local Display Unit The Local Display Unit (LDU) works with the SEABus networkto poll data from Siemens ACCESS compatible devices. TheLDU can be moun

53Review 41. WinPM is an example of a ____________ device.a. supervisoryb.field2. A Siemens ACCESS power meter is an example of a____________ device.a

54Power MeteringIn today’s electronic environment, power management requiressophisticated meters. Voltage, current, and kW meters alone donot provide

55Meter Location Power meters should be located at key points in the electricaldistribution system to effectively monitor power consumptionand quality

569230 Meter The 9230 power meter measures real power. It will provide areadout of watts, watt-hours, and watt demand (configurabledemand period). Th

574300 Meter The 4300 meter provides a readout of phase current, averagephase current, line voltage, average line voltage, frequency,watts, watt-hours

589240 Meter The 9240 meter provides all significant parameters of the powersystem including; 3-phase volts, 3-phase current, neutralcurrent, watts, V

59The 9300 includes a front optical data port for accessibility by aportable PC.9330 Meter The 9330 meter offers the same features as the 9300 meter.

6Distribution In order for generated power to be useful it must be transmittedfrom the generating plant to residential, commercial, andindustrial cust

604700 Meter In addition to providing information on all significant parametersof a power system, the 4700 includes waveform capture forharmonic analy

619500 Meter The 9500 offers three-phase power monitoring on a large, easyto read screen. The 9500 meter monitors K-factor, crest factor,individual ha

62Another unique feature of the 9500 is the optional ability toconnect to the Global Position Satellite (GPS) system for timesynchronization with othe

63Power Meter FeaturesSiemens power meters have various features, depending onspecific application needs. With a number of meters to choosefrom it may

6492304300924093009330470047209500MeasurementsReal PowerBi-Directional EnergySliding Window DemandReactive & Apparent PowerVoltage & CurrentPo

65Review 51. Power meters should be located at ____________ pointsin the electrical distribution system.2. The ____________ and ____________ meters in

66Protective Relays and Trip UnitsThe term switchgear is used to describe coordinated devicesused for control and protection of equipment such asgener

67SIPROTEC SIPROTEC is a trade name used by Siemens to identify a groupof Siemens multifunction protection relays, such as the 7SJ61,7SJ62, and 7SJ63.

68Circuit Breaker Trip UnitsThe following sections describe low voltage insulated case(ICCB), molded case (MCCB) circuit breakers, and Type RLcircuit

69The TL trip unit features a full range of industry standardprotective settings. The high-performance Systems BreakerEnergy Communicating trip unit (

7Loads Electricity is used to produce motion, light, sound, and heat. ACmotors, which account for about 60% of all electricity used, arewidely used in

70Type RL Circuit Breaker Siemens RL series low voltage power circuit breakers are usedin Siemens low voltage switchgear. RL series circuit breakersar

71The Static Trip III consists of four models:A standard feature of the Static Trip IIIC, IIICP, and IIICPX tripunits is an alarm output. Any measure

72SAMMSThe Siemens Advanced Motor Master System (SAMMS™) is amicroprocessor-based motor control and protection device.SAMMS LV units provides all moto

73ACCESS Communication SAMMS connects to SEABus through an optional SAMMSCommunication Module (CM-1). The CM-1 provides an RS-485interface to communic

74S7 I/O DeviceThe S7 I/O™ device is an addressable modular input/output (I/O)device that links power system components to the ACCESSsystem. This devi

75The S7-I/O device provides the capability to monitor and controlpower system elements that are not specifically designed forACCESS. Remote monitorin

76Lighting Control SystemLighting accounts for a large percentage of commercial andindustrial power consumption. With a lighting control system,interi

77LCP Products The LCP (Lighting Control Panel) family of lighting controlsystems is perfect for commercial applications such as schools,recreation ce

78System Accessories Several accessories are available to enhance the operation ofLCP products. A photocell can be used to control lights basedon the

79ACCESS System Application ExampleThe following illustration shows an example of SiemensACCESS system including hardware, software, and fielddevices.

8Review 11. Which of the following is a benefit to using theSiemens ACCESS system?a. Reduce or eliminate unplanned outagesb.Proactively manage power s

80Review 61. ____________ is a trade name used by Siemens toidentify a group of multifunction protection relays.2. Siemens Sentron ICCB circuit breake

81Review AnswersReview 1 1) f; 2) 60; 3) current; 4) aReview 2 1) c; 2) 1200; 3) 562.9; 4) b; 5) 1.41; 6) bReview 3 1) 120; 2) 5; 3) c; 4) K factor; 5

82Final ExamThe final exam is intended to be a learning tool. The book maybe used during the exam. A tear-out answer sheet is provided.After completin

835. Type ____________ disturbances last up to 0.5 Hz.a. Type I b. Type IIc. Type III d. Type IV6. The ____________ harmonic is a positive sequencehar

8411. The rules that govern the communication of theACCESS system are known collectively as____________ .a. DNP 3.0 b. SEABusc. ModBus d. Profibus DP1

8517. The Static Trip ____________ provides basic overcurrentprotection, metering, and extended protective relaying.a. III b. IIICc. IIICP d. IIICPX18

86Notes

87Notes

88Notes

9Voltage and Current ValuesAn accurate measurement of voltage supplied by the utility andthe current produced by the connected load is necessary inide