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Do you want to know how the circuit breaker works to fly the plane? No. But if something goes wrong, this little bit of knowledge will prepare you to evaluate the decision: "Should I restart the broken machine?"
Aircraft Circuit Breakers
Not all of them appear from the instructions below, with a few words in green. Isn't that all? The inner workings of a traditional thermal switch are like "old news" and I haven't seen anything clear about them.
Aircraft Circuit Breaker 1200 066 50 50a Amp Push Button Style
I've seen other designs, but this one looks great for an airplane switch. Their main meaning is that the metal disk in the CB is heated. If it's too hot, it goes. Reset the switch again, or worse, keep it warm. The result can be a crack with the metal disk broken so it can't reboot, or flooded so it won't reboot.
The thermal switch is designed to continuously interrupt short circuits or overloads. It is now passed through a wire rope connecting two wire ropes. The strip is made in the form of an arc, which will suddenly snap into the back of the temperature. The second heat disk or strip itself is heated below the critical point when the current is still below the trip point. Above this point, the strip snaps and the two contact points no longer connect. Once the metal strip pops out, it must be allowed to cool before it can be dropped. To reset, the button depresses the outside of the metal strip to return to its original position.
Since the thermal switch depends on heat, the temperature can affect the tripping result. There are many areas in these cables that can be affected by corrosion. Old electronics can't do either. If it can't open, you know you have a problem. When it fails, the circuit breaker fails and you lose any protection you may have relied on. There is also the issue of "brute force" reset. You can rely on these types of circuit breakers and force them to close.
Tripping a circuit breaker wasn't a big deal a few years ago, trust us, push it away. Here's what many Boeing 707 manuals say about it in the last century:
Simulator Aircraft Circuit Breaker
The circuit breaker has the ability to effectively protect against electric current. All circuit breakers are designed to trip freely; that is, they cannot be manually held to override the circuit breaker and force it to remain in the reset position. The heat of the bimetallic strip causes the actuator to move: so once the circuit breaker is tripped, it must cool before it can be reset. The recovery time required to complete the reset is approximately 3 seconds. Switches can be pulled and reset without damaging the switch; However, the loading circuit should be kept to a minimum as switches are provided to disconnect the electrical equipment.
Other books limit us to 3 resets. But after more than a few failed attempts, most manufacturers have settled on the "you shouldn't" theory of resetting the circuit breaker:
(1) The FAA reiterates its concern about circuit breakers being reset during flight. Crew members can create a potentially dangerous problem if they reset a circuit breaker without knowing what caused it to trip. You must not resume any maneuver in flight unless it is in accordance with procedures clearly set out in the approved manual used by the pilots, or unless, in the opinion of the Director, resetting the switch is not necessary for complete safety. flight The detailed information stored in the aircraft's maintenance engine is a proven safety feature for target tracking and can provide maintenance personnel with critical information to help quickly resolve problems and improve the ground.
(2) General aviation manuals and training manuals must contain company policies and procedures detailing electrical circuit reset during both normal driving and ground conditions. Manual procedures used by pilot personnel, maintenance personnel and flight attendants must be in accordance with the aircraft manual. You must warn employees not to use electrical generators to perform work procedures unless specified in company-approved procedures or the manufacturer's work procedures.
B737ng Circuit Breakers Panels
NOTE: The current version of AC 25-16, Fire and Fire Protection and Fire Prevention, contains additional information on this topic.
On June 2, 1983, an Air Canada DC-9 was destroyed and 23 of the 46 passengers died in a cabin fire. Later, there were three power outages related to the pool, and the director, according to the rules of the time, tried to reset all three. At the time, he noted that the switches "pop when I push them." The fire was not traced to the washing machine, but said the supply cable could be to blame. The NTSB was unable to determine the cause of the fire, but the industry's perception of electricity was forever changed. Learn more about this: Case Study: Air Canada 797.
As we have seen, the generator equipment has a delay time between the excess current and the negative current. It also suffers from being dependent on the temperature of the switch itself. Finally, equipment is subject to corrosion and aging. If you change the equipment, you can eliminate these problems. The electronic device in the state has a solution.
We in aviation are used to reading schematics where lines represent wires in squares that represent electrical components. In the old days, you would rationalize what happened in that box. But in the computer age, you could write "magic happens" on that box. We hope to read what happened and believe it. "Trust us." When it comes to solid state switches, what do you think now that you have a switch without a switch?
Remote Control Circuit Breakers
The following is a forty-year retelling of the forgotten two years of electrical engineering classes. But I hope this helps to understand your virtual generator. Your generator should have some sort of surge protection. This is usually solved with multiple circuit breakers or fuses. Each group of electrical equipment in your aircraft (lights, radio, avionics, etc.) will include its own fuse or circuit breaker. They are intended to protect these devices (by sending them) in the event of an overload or short circuit. The concept of isolation of electrical equipment means that the closing of one group (due to overload or short circuit) will not affect the rest of the electrical equipment and will stop working.
Three types of electrical protection (from left to right): The generator cannot be moved by hand, the generator can be pulled out by pulling the fuse rod and fuse plate.
As a designer, you can choose between using fuses or circuit breakers in your home. Both work essentially the same - but in slightly different ways. Fuses should be replaced if they are "machine" where the electrical circuit is reset at the push of a button. Circuit breakers come in one of two types: those that can be manually "tripped" or tripped, and those that cannot. Before choosing an automatic switch, you should decide which of these models you like best.
The fuse can be pulled out of the slot at any time, causing the circuit to become electrically "dead". For maintenance or testing purposes, the failure of a particular circuit provides a very useful function: it allows aircraft components to remain stable and operational. For example, if you are troubleshooting a noise problem in a radio communications link, it can be quick and easy to disconnect one circuit at a time (not on the fly!) until the noise disappears.
Sabreliner Aircraft Circuit Breaker Panel
Also, in the case of a complex electrical system that does not have a schematic diagram, it will be easy to determine the equipment for each circuit. Pulling the fuse will quickly reveal this
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