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> High power supply ac 400HZ apu 3 phase inverter 400 hz
High power supply ac 400HZ apu 3 phase inverter 400 hz
High Power AC 400Hz Military APU 3 Three Phase Inverter 10 KVA output power. Manufactured by Transistor Devices, for helicopter (C130) Auxiliary Power Unit. Supply includes mating military cables for AC input and output. Each of the cables is 5' in length and in a stainless steel flexible conduit. Flying leads at ends are about 6" in length. Input voltage is 208 three phase 50/60 Hz, Output is 200/115 (phase to phase/phase to neutral) VAC at 28 amps/leg, three phase 400Hz. Model numbers are ESU127/A Power supply, and ECU-128/A for the static inverter modules. The inverter is built up from three modules. The thin one on the left is the redundant AC input module that does power factor correction. It then sends 350-450 VDC to the power supply inverter module on the right. Inside the right module a switch mode power supply takes the PFC output voltage and generates +/-200VDC and sends it off to the three phase inverter. The inverter then chops up the DC into three phase 115/200 Wye configuration (with neutral). The input is 208 VAC 50/60 hz four wire (no neutral, just earth ground). The neutral on the output is not connected to earth ground inside, but can be at the load side. The unit will convert 10,000 watts for a resistive load, A power factor of 1. Many loads do not have unity power factor and will affect apparent power. See link below to wikipedia, if you are unfamiliar with power factor.
http://en.wikipedia.org/wiki/Power_factor
