3 phase synchoronous machine setup



  DC Motor Coupled to 3 Phase Salient Motor Training System

Three Phase Salient Pole Alternator coupled to DC integrated motor setup (Motor-Generator setup): with high resolution rotary encoder having accessible output and speed measurement :


  1. 3 Phase Salient Pole Alternator: Voltage: 415VAC, 50Hz, Capacity: 1HP/4pole/1500RPM, Rotor construction: Star connected,  four  terminals including star point brought out on 4 slip rings mounted on shaft, Stator construction: Separately excited field winding with  laminated solid yoke, 4 pole, brought out on Two terminal, Frame/mounting: 100 frame, chassis mounted, 19mm shaft dia with easily swappable gear coupling.

DC Integrated Motor : Voltage: Varm = 180V, Vfield = 180V, Capacity: 1HP/2pole/1500RPM/6             terminals,            Rotor     construction:     Standard

commentator/brush arrangement with laminated stack, brought out on

2 terminals, Stator construction: Separately excited field winding with laminated solid yoke 2 pole & series winding brought out on 4 terminals, Frame/mounting: 100 frame, chassis mounted, 19mm shaft  dia,  trunnion mounted m/c for use as dynamometer with torque & speed sensors.

Technical Specifications

Aluminum profile Sturdy Modular Flat (5 ×4) panel (table top) system, carrying various high voltage components housed in plastic enclosures (panel) to minimize shock possibility.

Input 3 Phase DOL Starter Panel

4 pole MCB of 415 V/4A .

DOL 9A Contactor with 230V / 50 Hz / 11VA Coil . Bimetallic thermal O/L relay with range 1.4A – 2.3A .

1 Phase Motor, Alternator & Sync. Motor Panel

1 MCBs of 4A/1.6A 1 each.

2no 2P2W selector switches to run as 1 alternator then as synchronous motor should be provided.

8A pushbutton switches to simulate as centrifugal switch.

3 Phase Bidirectional Power cum Energy Meter Panel

Bidirectional Multifunction

3 Phase ¾ wire, 415V, CT Input 5A

LCD/LED display, Aux supply 230V, 45-65 Hz, 5W V,I., Hz, Pf, KVA, KW, KWH , Modbus RTU RS 485

Integrated AC 1 Phase Multifunction Measurement Panel Consist of 1 Nos of (96 ×96mm) Digital meter for 1 F Measures V, I, PF (0.2 lag – unity 0.2 lead), W, VA, VAR, Hz etc.

Current Range = 5A.

Auxiliary supply = 170-250VAC

FWD/REV, Star-Delta Starter Panel

FWD/REV, 3 pole 3 way switch with centre OFF, 6A/440V. Star/Delta switch 3 pole, 3 way with centre OFF, 6A/440V.

3 Phase Wound Rotor & Sync. Motor Panel

Rotor resistors of 30E/5A with 3 taps of 0E, 15E, 21E, 30E( 3 nos) Rotor resistor selector switch, 3 pole.6 Way .6A/440 V.

DC Rotor excitation with over current Circuit Breaker (3Amp)

DC Voltmeter & DC Ammeter Measurement Panel

a) DC voltmeter (0-300V), b) DC Ammeter (0-5A) with polarity protection diode c) Field failure relay to control Armature supply.

SCR Actuator (variable DC) cum sensor signal conditioning panel

Full bridge SCR based 0V-195V / 3 Amp cosines firing with linear characteristics. Supports signal conditioning circuit for speed, torque in kg to give output 0-2.5Vdc (FS). 2 Nos. of these supplies required for DC

Armature,  DC  motor  field  &  for  AC  generator  excitation  should  beprovided.

Instrumentation Power supply cum Multichannel Digital Meter Panel (a) +/-12 V, 500 mA, (b) +5V, 300mA, (c) Unregulated 17V dc/750 mA (d) line synchronizing signal, (e) 13V / 3 Amp.  (f)  Multi  channel  digital  display of torque, speed etc.

Resistor Load Panel

(1) AC Resistors = 10K/5K/3.5K/2.5K/2K/1.5K/200WX3 phases / 6 taps (2) DC Resistors = 750E / 600E / 300E / 212E / 162E / 125E / 112E/100E/400W / 6 taps+OFF+ separate 60E tap for DC series Gen.

LC Load Panel

(A) Inductive Load = 0.15H / 0.3H / 0.45H / 0.6H / 0.75H / 1.5H / 3H / 400mA ×3 Nos. (B) Capacitive Load =  1.25µF/  2.5µF/5µF/415V  ×  3 Nos.

Variable AC/DC Power Supply Panel

AC output 0 to 270V / 3 Amp. , DC output 0 to 230V / 3 Amp.

Synchronization Panel

Synchronization Digital Meter , Synchronization switch and 15W lamp

×6 Nos. should be provided.

PC  Interface  cum Data Logging                            facilities should be provided with following additional Panels:

  1. DC Current /Voltage Measurement Panel

DC current hall sensor (×2nos.): Closed Loop current measurement using Hall sensor IC (max. I/P upto 20A, 50/60Hz), Isolation = 2.1KV, Proportional O/P = 0 – 2.5V, 1 CH.

DC Voltage transducer (×2 nos): Using high speed opto coupler IC (max. up to 600Vdc), isolation = 2 KV, 1 CH.

Function Blocks Used : Precision rectifier (× 2 nos) with gain = 5, LPF (×2nos) with gain = 2, Span Zero Circuit  to interface with ADC(0-2.5Vdc) for both current & voltage, only 1 functional block  each  supplied,  2nd  , Field failure/zero current detector.

Needs CIP panel to interface with PC USB port.

  • Computer Interface Panel

It should be connect to PC USB port using USB IO module through 25 pin D (M) connector on CIP & type A to mini B cable.

4 ADC channels I/P: 0 to 2.5V FS with 1no input simulation pot. 1 DAC channel O/P 2.5V FS.

V to I function block: I/P 0 to 2.5V & O/P 0-20 or 4-20mA (100E load) switch settable.

I to V function block : I/P 4 to 20mA & O/P 0 – 2.5V

3) Software on CD: Virtual Workbench package is a USB / serial modbus based software working on windows dot Net platform coupled with USB IO module useful as general purpose utility which supports different control strategies like Single or multi loop PID controllers, Fuzzy controller  etc,  Graph  plotting  in  XY,  XT  &  polar  mode  etc,  Modbus

interface,  Data  logging,  Event  trigger,  inbuilt  Function  generator  etc

should be provided.

List of Experiments should be covered :

  1. DC Motor: Speed torque curve of
    1. DC Shunt motor, ii) DC series motor, iii) separately excited DC motor,

iv) DC compound motor.

2) DC Generator: V-I, Efficiency curve for

i) DC shunt generator, ii) DC Series Generator, iii) DC separately excited generator, iv) DC Compound Generator v) OCC of shunt  generator. 3)3Phase Synchronous Motor:

i) Speed torque curve of synchronous motor ii) Efficiency & input power factor measurement, iii) Study of V-curve & inverted ‘V’ curve. 4)Synchronous Generator :

i) Grid synchronization ii) Output  Volt-Amp characteristics, iii) Efficiency   of Synchronous generator, iv) Performance with R, L, C load

Note: Supporting documents/manuals of the setup should be provided for performing the mentioned experiments.

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