DBB-2E Double Bus Bar System Educational Equipment Electrical Training Panel
The vectorial field-oriented control servomechanism for asynchronous three-phase motor enables the student to learn, demonstrate and experiment the main concepts of field oriented control. TRAINING PROGRAM: • Asynchronous three-phase motor: electrical andmechanical characteristics; • Vectorial field-oriented control (F.O.C.); • Speed and torque control; • Analysis of the IGBT three-phase inverter; • “Space vector” vectorial modulation; • Voltage/current wTransmission and distribution of electric power is usually carried out over high-voltage (HV) and medium-voltage (MV) lines. TRAINING PROGRAM: • Electric generation: three-phase alternators and primemovers, safety devices for alternators (specific protectionrelays), parallel of alternators: devices and conditions of parallel connection. • Double Bus Bar circuit: MAIN line and AUXILIARY line. • Multifunction instruments: functions, programming anduse. • Power transmission lines: study of HV transmission lines(featuring concentrated parameters), voltage drop versussection and length of conductors. Types of power lines:copper, aluminum. Power lines in series and in parallel. • PLC: programming languages and structure, digital inputs andoutputs and corresponding links with the fi eld. Applicationof the software for developing programs via a PC. TheDBB-2E program as a case of study. • Protection relays: study of 3 different protection relays(included in the panel): function of relays, main action,parameters to be set, connections with the system. • Automatic sequence to guarantee continuity of service:starting, connection and parallel of auxiliary M-G sets. • Power Factor Correction (Optional) TECHNICAL CHARACTERISTICS: GENERAL CHARACTERISTICS • Vertical tabletop metal panel, with solid framework ofpainted sheet steel, anti-tip legs with anti-slip rubber feet.Front panel silkscreen printed with the system layout markedwith international symbols • All terminals are 4 mm safety plugs. • Indicator lamps for the operational states of the system. The panel includes the following components: THREE-PHASE HIGH-VOLTAGE LINES Two three-phase lines of high voltage (exceeding 20 kV) forpower transmission; these lines are simulated by model“ϖ” with concentrated parameters. Both lines can be used separately, connected in parallel, or in series. Power supply:3 x 400 V (max.). Line 1: the variable parameter is the section of cables andconsequently the transmitted power capacity: • Simulated distance: 50 km • Transmitted power (MVA): 10-15-20, simulated by concentratedparameters • Equivalent parameters: resistance: 18-25-35 Ω; inductance:72 mH; distributed capacitance: 2 x 0.2 µF • Circuit breakers at line beginning and end • Protection by fuses Line 2: the variable parameter is the distance (km): • Length that can be selected among 25 -50 and 100 km • Simulated voltage: 120 kV • Transmitted power: 20 MVA • Equivalent parameters: resistance: 9-25-35 Ω; inductance: 144- 72 - 36 mH; distributedcapacitance: 2 x 0.1 - 0.2 - 0.4 µF • Circuit breakers at line beginning and end • Protection by fuses. SIGNALLING, PROTECTION AND CONTROL ELEMENTS • 4 industrial contactors, with four NO power contacts.Auxiliary contacts: 1 NO + 1 NC. Coil: 24 Vdc. • Four START/STOP buttons and indicator lamp • EMERGENCY button • 3-position selector for the operating modes • 1 automatic thermo-magnetic 4-pole switch, 10 A, C curve,equipped with releasing remote coil (via emergency button) • Voltage pilot lamps • Power supply of power circuits: 3 x 400 V/N/PE - 10 A • Power supply of control circuits: 24 Vdc - 2 A max. PLC SYSTEM • PLC by Siemens • Power supply unit of 24 Vdc - 2 A, with electronic protectionagainst overloads and short-circuits for the control of digitalinputs and outputs • 14 digital inputs: six of these inputs are used for the quickcount • 10 digital outputs of 24 Vdc with transistors • RS-485 interface and adapter with USB cable for programming • LED for the state of inputs and outputs PROTECTION RELAYS This system is provided with the three relays described herebelow: • Overcurrent relay (protection functions 50/51): electronicthree-phase maximum-current/ short-circuit, adjustmentrange 1-5 / 5-25 A ac. • N.2 MAX/MIN voltage relay (protection functions 27/59):electronic three-phase/N,voltage Ue selectable among 380-400-415 Vac; adjustment range +10% / -15% Ue. • N. 2 PHASE SEQUENCE AND ASYMMETRY RELAY (protectionfunctions 47/60): electronic device, 400 Vac, asymmetryselectable in the range: 5-15%. MULTI-FUNCTION AC INSTRUMENTS N. 3 microprocessor-controlled multi-function instrumentsfor power analysis. These three instruments have separateterminals for safety leads of 4 mm, for a totally free use. • for measurements on balanced / unbalanced 3-ph systems,with or without Neutral, or of single-ph systems; • these instruments enable to measure more than 300parameters such as voltages and currents (in TRMS), active,reactive and apparent power, power factor, frequency,analysis up to the 31st harmonic of V and I, besides the total/ partial active power, total / partial reactive power. Accuracyclass of the instrument for V and I: 0.2%. Current up to 10 A(with internal CT 10/5) - max. phase-to-phase voltage of 830V - 45…66 Hz. • Auxiliary power supply: 110…240 Vac - 50-60 Hz • Liquid-Crystal Display (LCD), 128 x 80 pixels with 4 grey levels • With 4 pushbuttons to display and set measurement pages • Four programmable pages among the most frequently usedparameters (selectableamong the measurement units). Accessories supplied • software for the configuration of the data detected by theinstruments, setting the measures and the sampling time,graphic display of data versus time. Overall dimensions of the panel: 1320 x 820 x 660 mm Weight: 74 kg Supply with THEORETICAL – EXPERIMENTAL HANDBOOK
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