Wymuszalnik prądowy AC - SMC LET-400

AC Current Injector up to 2.5 kA

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

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.

CHARACTERISTICS

  • Permanent current up to 400A 1KVA in 4 Ranges.
  • Thermal and shortcircuit protection.

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.

Nominal current is indicated in each model’s name. However, higher currents can be attained for limited periods as long as the connected load (including the test leads) falls within the unit’s output power.

Product Power Ranges Permanent Maximum current output Timer Ammeter Motorized
Regulation
Auxiliary
DC
60m 15 m 3 m 1 m 1 s
LET-400 1 KVA 10 A, 50 A,
200 A, 400 A
400 A 600 A 800 A 1,1 KA 1,4 KA 2,5 KA - - - -
LET-400-RD 1 KVA 10 A, 50 A,
200 A, 400 A
400 A 600 A 800 A 1,1 KA 1,4 KA 2,5 KA yes yes - -
LET-400-RDC 1 KVA 10 A, 50 A,
200 A, 400 A
400 A 600 A 800 A 1,1 KA 1,4 KA 2,5 KA yes yes - yes
LET-1000-RD 2 KVA 250 A, 500 A,
1000 A
1 KA 1,5 KA 2,25 KA 2,75 KA 3,5 KA 6,25 KA yes yes - -
LET-2000-RD 4 KVA 250 A, 500 A,
1000 A, 2000 A
2 KA 2,4 KA 3,6 KA 4,8 KA 6 KA 10,8 KA yes yes - -
LET-2000-RDM 4 KVA 250 A, 1000 A,
2000 A
2 KA 2,4 KA 3,6 KA 4,8 KA 6 KA 10,8 KA yes yes yes -
LET-2010-RD 6 KVA 500 A, 1000 A,
2000 A
2 KA 2,5 KA 4 KA 5,5 KA 7 KA 13 KA yes yes - -
LET-4000-RD 8 KVA 500 A, 1000 A,
2000 A, 4000 A
4 KA 4,8 KA 7,2 KA 9,6 KA 12 KA 21,6 KA yes yes - -
LET-4000-RDM 8 KVA 500 A, 1000 A,
2000 A, 4000 A
4 KA 4,8 KA 7,2 KA 9,6 KA 12 KA 21,6 KA yes yes yes -
LET-4000-R 8 KVA 4000 A 4 KA DC - - - 5 KA DC - yes yes - -

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