GPB
Government Polytechnic BhujElectrical Engineering Department
Electrical Machines–I Connection LabGTU Diploma · Semester 3 · DI03000081
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PrO 2 · CO1 · D.C. Generator

Load Test on a D.C. Shunt Generator

Build the shunt-field and load circuits, then determine external characteristics and voltage regulation.

0 patch cords
Connection reference

Study the complete circuit before wiring

Selected setupShunt Generator Load Test
1

Trace each numbered conductor on the diagram.

2

Match the apparatus and terminal labels.

3

Build the circuit yourself on the next screen.

4

Check the circuit before switching ON.

Conventional circuit diagramLoad Test on a D.C. Shunt Generator
GA1A2230 V · 2.2 kW · 1500 rpmPRIME MOVERALOAD CURRENT0–15 A D.C.LOAD BANKL+L−VTERMINAL VOLTAGE0–300 V D.C.FIELD RHEOSTAT12SHUNT FIELDF1F2

Symbols are arranged as in a laboratory circuit diagram. Match the terminal names with the connection schedule below before wiring the virtual bench.

Equipment ratingsNameplate data for this virtual setup

Check every rating before selecting a meter range or energising the circuit.

↻
Prime Mover3 kW, 1500 rpm

Maintains generator at rated speed

Ω
Field Rheostat0–300 Ω, 2 A

Variable resistance

A
Ammeter0–15 A D.C.

Connect in series

M/G
D.C. Shunt Generator230 V, 10 A, 2.2 kW, 1500 rpm

Armature and shunt-field terminals

▥
Load Bank230 V D.C., 15 A, 2.5 kW

Switched resistive load

V
Voltmeter0–300 V D.C.

Connect in parallel

Reference connection schedule8 cords in this reference
  1. 1

    D.C. Shunt GeneratorA1connect toField Rheostat1

  2. 2

    D.C. Shunt GeneratorF1connect toField Rheostat2

  3. 3

    D.C. Shunt GeneratorA2connect toD.C. Shunt GeneratorF2

  4. 4

    D.C. Shunt GeneratorA1connect toAmmeter+

  5. 5

    Ammeter−connect toLoad BankL+

  6. 6

    D.C. Shunt GeneratorA2connect toLoad BankL−

  7. 7

    D.C. Shunt GeneratorA1connect toVoltmeter+

  8. 8

    D.C. Shunt GeneratorA2connect toVoltmeter−

Common electrical nodes

These terminals may be joined in any equivalent terminal-to-terminal order.

D.C. Shunt GeneratorTerminal A1Cables 1, 4, 7
D.C. Shunt GeneratorTerminal A2Cables 3, 6, 8
Important

The listed cord sequence is one correct method. Any alternative wiring that creates the same electrical nodes is also accepted. Reversed ammeter, voltmeter, or load polarity is valid; the affected reading appears negative.

Principle

The field winding is connected across the generator terminals. Terminal voltage falls with load because of armature resistance and armature reaction.

Safety checkpoint

Keep the load OFF initially. Never open the shunt-field circuit while the generator is running.