12 Attachment 01 52.212-1 Addendum - Aircraft Power Converter Specifications 140-kVA.docx

Purchase Specification Aircraft Power

140 kVA 400 Hz Ground Power Converter

Hill Air Force Base, Utah 309 Aircraft Maintenance Group (AMXG)

11 March 2020

Purchased to support the 309th Aircraft Maintenance Group

Purpose Purchase two (2) power converters capable of supplying 140 kilo-volt-ampere (kVA) of 208/120 Volts Alternating Current (VAC) 400 Hertz (Hz) and 28Volts (V) Direct Current (DC) interlock capability electricity. The power converters will transform existing 480 VAC/3 phase/60 Hz power in Government buildings to the required 400Hz.

Requirements/Specifications The requirements and specifications in this section are not listed in a prioritized order. All requirements and specifications listed must be met or exceeded.

400 Hz Standards/Specification

· Must meet current version of National Electrical Code (NEC)/National Fire Protection Association (NFPA) 70

· Must meet or exceed Military Standard MIL-STD-704F Aircraft Electrical Power Characteristics

· Must comply with SAE International aerospace recommended practice (ARP) ARP-5015B 400 Hz Ground Power Performance Requirements

· Must comply with Unified Facilities Criteria (UFC) UFC 3-555-01N 400 Hertz Medium Voltage Conversions/Distribution and Low Voltage Utilization Systems

Nominal Rating

· 140 kVA at 80% power factor load at output

Performance Characteristics

Input Power

· Alternating Current (AC) Input Voltage: The unit shall operate with input voltages not varying more than plus 10% or minus 15% of the source’s nominally rated voltage. Nominal ratings are: 480 VAC, 415 VAC, 400 VAC, 380 VAC.

· AC Input Frequency: The unit shall operate on input power frequencies ranging from 45 Hz to 65 Hz.

· Input Current Requirements at Rated Load: The nominal input current requirements for the unit at rated load are:

· Input Volts 140KVA

· 480VAC = 155 amps

· Input Inrush Current: Inrush current shall not exceed 100% of input current required when the unit is operating at rated load output on start up.

· Input Power Factor: The input power factor shall be 95% or greater at loads 25% of or greater than the nominal rated load for the unit.

· Input Phase Rotation: The unit shall be input phase rotation independent, allowing the unit to be connected to the incoming power without regard for phase rotation.

· Input Circuit Breaker: The unit will contain an internally mounted circuit breaker on the input power lines to allow the input power to be removed in the case of a fault or for maintenance.

· 12-Step Input Rectifier: An input 12-step rectifier shall be provided to reduce the input current distortion to 10% or less at 100% load.

Output Power

· Output Voltage: The unit output voltage shall be rated at 115/200VAC. This voltage may be adjusted plus or minus 10%.

· Output Voltage Drift: The unit ambient temperature will not increase more-than 55 degrees Celsius (C) in an eight hour period, or as the unit stabilized from a cold condition at any load, the output voltage shall not change by more than 1% of its originally set value.

· Output Voltage Regulation: The unit output voltage shall recover to the steady state condition less-than 20 minutes after any load change up to 100%. The voltage shall not exceed the limits of MIL-STD-704E during transient recovery.

· Output Voltage Distortion (Total Harmonic Distortion): The unit output voltage wave form total harmonic distortion shall not exceed 3% with any rated load up to 100%. Any single harmonic distortion will not exceed 2% of the fundamental.

· Output Voltage DC Content: The unit DC voltage at the output terminals shall not exceed 0.1V under any rated load conditions.

· Output Voltage Modulation: The modulation of the voltage waveform shall not exceed 2.5V when measured as the peak to valley difference between the maximum and minimum peak voltages reached on the modulation envelope over a period of 1 second.

· Output Voltage Balance: The maximum unit output voltage difference of one phase to another phase will not exceed 1% of the rated output voltage. The maximum output voltage difference of one phase to another phase will not exceed 3% of the rated output voltage with a 30% unbalanced load.

· Output Frequency Drift: With the unit operating at a constant load, a change in ambient temperature up to 55 degrees C in an eight hour period, or as the unit stabilizes from a cold condition at any load shall not cause the output frequency to change by more than 0.1%.

· Output Frequency Regulation: The output frequency will be 400Hz plus or minus 0.1% at any rated load condition.

· Output Current: 140 kVA (400 amps) at .8 power factor load continuous

· Output Power Factor: The unit will be capable of operating with an output power factor of 0.0 to 1.0.

· Output Phase Displacement: The phase angle between each of the three output phases will be 120 degrees plus or minus 1.5 degrees under all rated, balanced load conditions. The phase angle displacement with an unbalanced load of 30% the unit’s rated current shall be 120 degrees plus or minus 4 degrees.

· Efficiency: The overall efficiency of the unit shall be 92% at 50% or greater load.

· Overload Capacity: Each output will be capable of supplying overloads of up-to 125% for 10 minutes, 150% for 30 seconds, 200% for 10 seconds, and 250% for 1 second.

· Short Circuit Capability: The unit will be capable of withstanding, without damage, an output short circuit cleared by internal solid-state circuitry.

Switches and Controls

· The following switches and controls will be mounted on the outside of the main cabinet of the unit:

· Stop push button – for stopping/resetting the unit

· Start push button – for starting the unit

· The following switches and controls will be mounted inside the main cabinet of the unit:

· Auto/manual switch – enable/disable output voltage regulation

· Bypass switch – enable/disable 28V EF (interlock) monitoring

· Remote IV (current and voltage) Sense switch – enable/disable remote output voltage monitoring or other options.

· Line drop compensation adjustment – sets compensation amount

· Bus voltage adjustment – sets DC bus voltage level

· Voltage adjustment pot – sets output voltage level

Fault Systems

The unit shall be capable of monitoring the following items and shutting down in the event they are out of tolerance. The faults listed below will be displayed in plain English on a text display:

· Input voltage 10% higher than nominal rating

· Input voltage 15% less than nominal rating

· Output voltage less than 100VAC per MIL-STD-704E

· Output voltage greater than 125VAC per MIL-STD-704E

· Output overload

· No 28VDC returned on EF wires

· Neutral fault (optional)

· DC bus discharge circuit overheated

· Overtemperature of an IGBT or Rectifier heatsink

· Output frequency out of tolerance

· Insulated Gate Bipolar Transistor (IGBT) failure, specific IGBT indicated

· No output voltage detected fault

Indicators

The following data shall be capable of being displayed in plain English text:

· Input volts phase A

· Input volts phase B

· Input volts phase C

· Input volts (average of 3 phases)

· Input current (average of 3 phases)

· Output volts phase A

· Output volts phase B

· Output volts phase C

· Output volts (average of 3 phases)

· Output current phase A

· Output current phase B

· Output current phase C

· Output current (average of 3 phases)

· Output kVA (total)

· Accumulated kilowatt-hours

· Output frequency

· +5VDC power supply

· +15VDC power supply

· +24VDC power supply

· Unit settings (kVA, input voltage)

· Date and time

Event and fault history:

· The most recent 20 events (start/stop/fault/reset) shall be stored and available to be viewed from the display.

· Data to be displayed as follows:

· Time of data sample

· Date of data sample

· Kilowatts used for docking cycle

· Fault

· Output volts at time of fault

· Output amps at time of fault

· Output volts max for docking cycle

· Output amps max for docking cycle

· Which output(s) were on during docking cycle

· A non-resettable hour meter will be mounted to indicate total operation hours. It will be capable of displaying up to 99,999 hours.

· Display will indicate the following items:

· Start push button pressed

· Stop push button pressed

· +5VDC present

· +15VDC present

· +24VDC present

· -15VDC present

· 28V Bypass switch in bypass position

· 28V EF voltage present

· IGBT drive circuits operating

· Panel lights will indicate the following:

· Fault occurred

· Input voltage applied to unit

· 28V bypass switch in bypass position

· Output voltage present

· 28V EF voltage missing

External Interface

· The unit will contain mounted terminal blocks for connection of external start/stop controls.

Physical Characteristics

· Weight: Max 1,800 pounds (816.47 kilograms).

· Can be relocated by forklift to fit through 6 foot (1.82 meter) door opening.

· Physical orientation shall be vertical in nature.

· Cabinet design shall prohibit Foreign Object Debris (FOD) entry.

· Cabinet Material: The cabinet will be constructed from painted steel.

· Weather Rating: The enclosure will be rated as National Electrical Manufacturers Association (NEMA) 4 or Ingress Protection code IP55.

· Hardware: All mounting hardware will be stainless steel.

· Wiring: All wires or cables will be numbered or labeled.

· Acoustical Noise: The unit shall not emit more than 65 A-weighted decibels (dBA) at 4.92 feet (1.5 meters) height and 3.28 feet (1.0 meter) distant.

· Temperature Rating: The unit will operate at a temperature of -40° to +55°C.

· The converter units (480 VAC input) shall be listed for UL-1012 and CSA-C22.2 No. 107.1.

Manuals and Drawings

· Technical manual(s), operation manual(s), and installation drawings to be furnished with purchase.