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LET-400 primary test equipment

The LET-400 is designed to perform primary tests that are necessary in substations commissioning.

Manufactory: EuroSMC, Spain.

Description

It allows to perform with sufficient power, all the primary current injections to test the proper function and wiring of all the elements that compose the protection and measuring section in a substation.
The regulation system is based on a continuously variable autotransformer (Variac) that supplies to a power transformer that delivers the high current outputs and isolate the main supply from the load.
 
APPLICATIONS:
  • Primary injection tests.
  • Test of measurement and protection transformers.
  • In general, primary injection tests including the complete loop, such as current transformer cables, protective relays, and circuit breakers.

Features
  • Permanent current up to 400A 1KVA in 4 Ranges
  • Built in digital ammeter 0.5% accuracy (LET-400-RD & LET-400-RDC)
  • Built in digital timer resolution 1 ms (LET-400-RD & LET-400-RDC)
  • Thermal and shortcircuit protection
  • Variable AC and DC voltage up to 220V (LET-400-RDC)
  • Variable auxiliary DC power supply up to 220V (LET-400-RDC)

 

LET-400

LET-400-RD

LET-400-RDC

AC Voltage output

N/A

N/A

220 V / 4 A

DC Voltage output

N/A

N/A

220 V / 4 A

Aux. DC Supply

N/A

N/A

0-50 / 110 / 220 Vdc – 1 / 0.5 / 0.25 Adc

Power

1000 VA

Open circuit voltage (tap)

0-138 V (10 A) / 0-27.5 V (50 A) / 0-6.9 V (200 A) / 0-3.45 V (400 A)

Supplied test leads

2 cables, 3-meter length, 95 mm2

Power supply

Single-phase 110/230 VAC (specify), 50-60 Hz

Consumption

5.5 A @ 220 V

5.7 A @ 220 V

5.9 A @ 220 V

Dimensions

340 × 370 × 250 mm

460 × 370 × 250 mm

Weight (unit only)

22 kg

24 kg

25 kg

AC VOLTAGE RANGES / DUTY CYCLE CHART

ON TIME / MAXIMUM CURRENT

Tap

No-load V

Continuous

60 min

15 min

3 min

1 min

1 sec

400 A

3.45 V

400 A

600 A

800 A

1100 A

1400 A

2500 A

200 A

6.90 V

200 A

350 A

400 A

550 A

700 A

1500 A

50 A

27.5 V

50 A

75 A

100 A

138 A

175 A

325 A

10 A

138 V

10 A

15 A

20 A

27.5 A

35 A

65 A

OFF (cool-down) time at 25 °C

15 min

20 min

20 min

30 min

 

Standard accessories:

  • LET-400 (LET-400-RD, LET-400-RDC)
  • Power cable, 3 m
  • Cable for connection, 3 m, 95 mm2 - 2 pcs
  • Measuring cable, 2 m - 2 pcs (LET-400-RD, LET-400-RDC)
  • Nylon protective "shirt"
  • User manual

Optional accessories:

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