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ET361 · Single-Phase Transformers

Experimental Apparatus for the Study of Single-Phase Transformers

A modular apparatus for the study of a compensated single-phase 230 V transformer with three secondary windings. A variable autotransformer feeds the primary and two variable rheostats load the secondaries. Nine digital display modules show voltage, current and power on the primary and on the secondaries at the same time, so the student runs the no-load, short-circuit and load tests on one panel and reads every value directly.
Description
    The ET361 is built from panel modules on a mobile frame with a single-phase power console. The variable autotransformer module sets the primary voltage between 0 and 250 V AC. The 140 VA single-phase transformer module has a 230 V primary winding, one 15 V / 3.6 A secondary and two separate 12 V / 3.6 A secondaries, each behind its own fuse. Three digital display modules each for voltage, current and power measure the primary and the secondary circuits. Two variable rheostat modules, 0…22 Ω and 0…3.3 Ω, load the transformer. Students connect the circuits with safety leads on 4 mm sockets.
Features
  • compensated single-phase transformer, 230 V, 140 VA, with three secondary windings
  • variable autotransformer 0…250 V AC, 5 A
  • 3 digital voltage, 3 digital current and 3 digital power display modules
  • variable rheostats 0…22 Ω and 0…3.3 Ω for loading the secondaries
  • fuse-protected secondary windings
  • mobile frame with cable holder and single-phase power console
  • measurements possible in dusty conditions
Specifications
    Power supply 230 V, 50 Hz
    Circuit breaker thermal-magnetic, 16 A
    Variable autotransformer 0…250 V AC, 5 A
    Transformer 140 VA; primary 230 V; 1 × secondary 15 V / 3.6 A; 2 × separate secondaries 12 V / 3.6 A, fuse-protected
    Digital display modules 3 × voltage, 3 × current, 3 × power
    Variable rheostats 0…22 Ω and 0…3.3 Ω
    Mobile frame H 1610 × L 940 × W 500 mm, with cable holder
    Power console single-phase; 16 A thermal-magnetic circuit breaker, key-operated emergency stop button, push-button with LED indicator
    Outlets 1 single-phase 230 V output on 4 mm safety terminals; 2 × 230 V AC (2P+E) sockets and 12 × 230 V AC (2P+E) sockets at the rear
    Mains connection 3 m cable with 2P+E plug, 230 V, 50/60 Hz
230V
L 940 W 500 H 1610 mm
Learning objectives / experiments
  • operation of a single-phase transformer at no load, in short circuit and under load
  • measurement of voltages, currents and powers on the primary and on the secondary windings
  • determination of the transformation ratio
  • calculation of the apparent, active and reactive powers
  • determination of the transformer losses
    • iron losses from the no-load test
    • copper losses from the short-circuit test
  • efficiency of the transformer as a function of the load
Scope of delivery
  • 1 variable autotransformer module 0…250 V AC, 5 A
  • 1 single-phase transformer module 140 VA with three secondary windings
  • 3 digital voltage display modules
  • 3 digital current display modules
  • 3 digital power display modules
  • 1 variable rheostat module 0…22 Ω
  • 1 variable rheostat module 0…3.3 Ω
  • 1 set of safety measuring leads
  • 1 mobile frame with cable holder
  • 1 single-phase power console
  • 1 set of instructional material

All components and accessories listed under Scope of delivery are supplied, whether or not they are visible in the illustrations.

Required for operation
  • 230 V, 50 Hz, 1 phase, socket with protective earth