30kVA 3 Phase Static Inverter + AVR
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The 30kVA Inverter is an AC to AC Module capable of producing a 400VAC line-line sine-wave, nominal 50-60Hz, 3 phase output from a 3 phase 35-115Hz variable frequency, variable voltage input. The Inverter has an optional front end Automatic Voltage Regulator (AVR) Module. This enables the system to regulate the output voltage of a Diesel Machine by directly driving the generator field excitation current. Note that the Inverter output is not an MEN equivalent supply. The system is non-isolated and supports external serial port (RS232) access. |
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This system is ideally suited to traction environments, where it can either control the auxiliary diesel generator, or alternatively regulate an alternator connected to the main traction engine to ensure a stable supply for all in-carriage/railcar auxiliary 230V/400V loads. It is also readily adaptable to other applications. The inverter and all associated components are rated for a 1200V DC bus, with the Static Inverter IGBT modules rated at 1700V. This is required to handle the load/speed changes on the main traction engine as the driver adjusts speed throughout the journey. The Inverter's communications can be adapted to interface with any on-board/external monitoring systems as a dedicated add-on. The Inverter + AVR contain live data logging for both normal operating behaviour and also recording any observed trips/external aberrant conditions. All faults/trips are recorded and accessible. The system includes a Differential Filter Block and a Common Mode Filter Block. |
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- Automatic Voltage Regulator (AVR) for 3-phase Alternator
- 1200V DC bus withstand
- 1700V IGBT 3-phase Power Stage
- 400V 50Hz Sinusoidal Output Waveform, with output good LED indicator
- Fan Forced Cooling
- DC link voltage monitoring
- Low losses & hence high efficiency operation
- Modular design for easy maintenance
- Enhanced DC protection through Communications between AVR and Inverter
- Galvanic Isolation between External Control and Power Circuitry
- Comprehensive Internal Registers containing Inverter Parameters
- 3 Level Security Protection of Inverter Parameters
- USB 2.0 full speed serial port
- LED Status
- Differential Filter Block
- Common Mode Filter Block
- Optional interface support for on-board data communications systems
- Input current limiting facility
- Input and Output Over Current Protection
- Output Short-Circuit Protection
- Input Under & Over Voltage Protection
- Heatsink Over Temperature Protection
- Provision of fault memory recording for diagnosis & subsequent fault analysis
- Fault Lockout on Permanent Fault Detection with external Fault Indicator
- Auto-restart on fault elimination (dependent on fault type and frequency of recurrence)
- Internal Contactor(s) Failure
- Communications Failure (RS485 mode)
- DC Bus to AC Voltage imbalance
- Fast Reaction to Input DC over voltage to enable ride-through
- Power Stage Gate Fault Detection
Technical Features
In-built Protection
Technical Specifications
Electrical
| Inverter + Automatic Voltage Regulator (AVR) | |
|---|---|
| Input (AC I) Voltage | 350 Vrms Minimum, 1200 Vpeak Maximum, 3 Phase |
| (400 V +/- 15%, 415 V +/- 15%) | |
| Input Frequency | 35-115 Hz |
| Power Rating | 30 kVA maximum |
| Voltage Output | 400 Vrms nominal, 3 Phase (open loop - load Regulation 5%) |
| Sinusoidal output with Differential Filter Block and Common Mode Block | |
| Output Frequency | 50 Hz ± 0.5 Hz |
| Power Factor Control | Fully controllable from 0 to 1, leading and lagging |
| DC Bus Voltage | 550-750 V (supports 150 V DC Start in Modes: OL, CL Only) |
| Switching Frequency | 10 kHz |
| Inverter Efficiency | >98% |
| AVR - Output Voltage | 0 - 110 VDC |
| AVR - Output Current | 0 - 2 ADC |
| Battery Input | 10 - 35 VDC, with On/Off clean contact input |
| Auxiliary Supply | 0 - 300 VAC, 1 Phase, 35 - 115 Hz (alternator auxiliary output) |
| External Communications | USB 2.0 (panel access - via Lexan panel)) | Differential Mode Filter Block |
| Definition | 3-phase LC (Inductor-Capacitor) Filter Module |
| Inductors | 700 μH, 40 A |
| Capacitors | 20 μF, 310 V X2 | DC Bus Capacitance Block |
| Definition | 6 off Series Connected DC Bus Capacitors |
| Connected in a series (3 off) / parallel (2 strings) configuration | |
| Capacitance | 3300 μF, 450 V |
| Discharge Resistors | 10 kΩ, 10 W | Common Mode Filter Block |
| Definition | 3-phase Common Mode Filter Module |
| Inductors | ~10 mH, 40 A |
| Capacitors | 0.047 μF, 310 V X2 |
Mechanical
| Main Enclosure - Inverter + AVR | |
|---|---|
| Dimensions (mm) | L: 520 mm |
| W: 408 mm | |
| H: 250 mm | |
| Weight | 18 kg (Approx.) |
| Cooling Medium | Forced air cooling |
| Mounting | 6 x M8 holes at 320 x 130 mm Separation | Differential Mode Filter Block |
| Dimensions (mm) | L: 340 mm |
| W: 158 mm | |
| H: 171 mm | |
| Weight | 10 kg (Approx.) |
| Cooling Medium | Natural cooling |
| Mounting | 4 x M8 holes | DC Bus Capacitance Module |
| Dimensions (mm) | L: 400 mm |
| W: 200 mm | |
| H: 400 mm | |
| Weight | 4 kg (Approx.) |
| Cooling Medium | Natural cooling |
| Mounting | Underslung - flexible depending on application | Common Mode Filter Module |
| Dimensions (mm) | L: 225 mm |
| W: 150 mm | |
| H: 149.6 mm | |
| Weight | 6 kg (Approx.) |
| Cooling Medium | Natural cooling |
| Mounting | 4 x M8 Holes |
Protection
| Operational Status | |
|---|---|
| Active Monitoring / Software Protection | Current Limiting |
| Input (AVR Mode) | |
| Over Current | Input + Output |
| Short Circuit | Output Protection |
| Over Voltage | Input |
| Under Voltage | Input |
| Voltage Control | Input (AVR), Output (Inverter) |
| Heatsink | Over Temperature Hysteresis Protection |
| DC Link Voltage Imbalance | Optional (only 1 voltage input available) |
| SMPS Failure Detection | Yes |
| Gate Driver Failure Detection | Yes |
| Semiconductor Device Failure Detection | Yes |
| Alternator Phase Loss | Yes |
| Contactor Failure Detection | Yes |
| DC / AC Voltage Imbalance | Checks for No DC when both AC and contactors closed |
| Field Supply Over Voltage Detection (AVR) | Yes |
| Field Over Current Detection (AVR) | Yes |
| Battery Voltage Detection | Over and Under |
| Generator Speed | Optional Over-speed detection |
| Communications | Inter-processor failure |
| Status LEDs - Inverter |  |
| Status LEDs - AVR |  |
Environmental
| Operating Temperature Range | -20°C to 55°C |
| Humidity | 5% - 95% non-condensing |
| Cooling | Fan Forced |
| IP Rating | 20 |
