An aviation ground power supply (AGS) is a device specifically designed to provide electrical power to aircraft. It is a core component of an aircraft's electrical system, responsible for providing stable and reliable power to various onboard equipment. Its presence enables aircraft to perform various essential operations on the ground. Today, we'll introduce you to AGS to help you better select the power supply you need.
Introduction to Aviation Ground Power
Aircraft Ground Linear Power Supply (GLP) - An AGS is a device that provides electrical power to aircraft. It is typically installed on the airport apron and connects to the aircraft through an interface to provide the necessary power. The primary function of an GLP is to provide power to aircraft while on the ground, including starting the engine, charging, operating air conditioning, lighting, and other equipment. In addition, some GLPs also have maintenance functions, providing temporary power for aircraft repairs and maintenance. When an aircraft needs to start the engine, charge, or perform testing, the operator connects the GLP to the GLP using a switch. The power transformer then converts the input low-voltage AC power into high-voltage DC power. The rectifier converts the AC power back into DC power. The filter then smoothes the DC power. Finally, the output DC power is delivered to various aircraft devices for use.
Main Functions of Aviation Ground Power
1. Engine Starting: Before takeoff, the aircraft's engines must be started using a ground-based linear power supply. This is because aircraft engines require a large amount of power, which is typically provided by ground-based linear power supplies.
2. Charging: Many aircraft devices, such as communications equipment, navigation equipment, and flight control systems, require power to operate properly. These devices are typically powered by the aircraft's batteries, which are then charged using ground-based linear power supplies.
3. Testing: During aircraft maintenance or inspections, various aircraft devices must be tested. These tests typically require a large amount of power, which is also provided by ground-based linear power supplies.
Types of Aviation Ground Power Supplies
Based on their output voltage and current, aircraft ground linear power supplies (AGSs) are primarily categorized into the following types:
28V aviation DC power supplies: Mainly power the aircraft's auxiliary power system (APU), used for engine starting and charging.
115/200V aviation AC power supplies: Available in single-phase and three-phase options, they are primarily used for the aircraft's main power system, providing power to various devices.
Aviation variable-frequency power supplies: Automatically adjust the output voltage and frequency to suit the needs of different aircraft models.
Mobile aviation ground power supplies: Suitable for providing temporary power to aircraft without a fixed installation location.
Things to Consider When Choosing an Aviation Power Supply
1. Select the appropriate input voltage range. Taking AC input as an example, common input voltages are 380V and 220V, which dictate whether the power output is low or high. Low-power 28V power supplies generally use 220V, while high-power power supplies generally use 380V. The input voltage should also be determined based on the region of use.
2. Select the appropriate power. Aviation power supplies consume some power during operation, which is released as heat. To extend the life of the power supply, it is recommended to select a model with an output power rating 30% higher.
3. Consider load characteristics. To improve system reliability, it is recommended that aviation 28V DC power supplies operate at 50%-80% load. For example, if the power consumption is 20kW, an aviation power supply with an output power of 25kW-40kW should be selected.
4. If the load is a motor, searchlight, or capacitive load, the current is high during startup, so an appropriate power supply should be selected to avoid overload. If the load is a motor, consider voltage backflow during shutdown.
5. In addition, the power supply's operating ambient temperature and the presence of additional cooling equipment should be considered. If the ambient temperature is too high, the power supply output may need to be derated. Refer to the ambient temperature-to-output power derating curve.
6. Select various functions based on application requirements: Protection functions include overvoltage protection (OVP), overtemperature protection (OTP), and overload protection (OLP). Application Functions: Signaling (power supply normal, power supply failure), remote control, telemetry, etc.
7. Power Supply Cooling Method: Natural cooling, forced air cooling, or water cooling.
8. Try to choose a 28V aviation power supply with a 400Hz medium-frequency power supply from a manufacturer that provides standard dimensions and output voltages. This ensures faster delivery and guaranteed performance.
Aviation power supplies are crucial for aircraft operations. They enable the aircraft to perform various necessary operations on the ground, ensuring safety and proper operation. Before purchasing an aviation power supply, it's important to understand relevant information to ensure you choose the right one for your needs.
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