Residual current devices (RCD). Schemes, articles of the Free Technical Library

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Residual current devices (RCD). Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Residual current devices (RCDs)

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Equalizer for car audio system

Section Acoustic systems. A car audio system is a very complex and controversial structure. Like it or not, but the closed space of the vehicle interior with the resonances that arise every now and then is not at all suitable for sound reproduction. The sound is affected by the shape of the body, the materials used to decorate the interior, the positions reserved by the manufacturers for acoustics, and much more in detail. Of course, no one claims that the creation of a solid mobile audio complex is an absolutely hopeless undertaking. You can experiment with crossover frequencies, find an acceptable location for the speakers, set the desired levels on the amplifier. But even these efforts are often unable to compensate for the conditions for the existence of components, prepared by the automakers. And this is where the equalizer comes in. ... >>

Watchdog with phone call

Section Security devices and signaling of objects. The guard devices described in amateur radio literature are usually suitable for guarding cars, apartments, garages and other objects. The device proposed here is also universal, and the function of automatic call of the subscriber is not associated with a significant circuit improvement. The logic of the watchdog is as follows. When the power is turned on, it forms a delay cycle, during which it does not respond to the state of security sensors. If the contacts of the sensors are closed, then after the generated delay cycle, the device is set to the watchdog mode ... >>

Asynchronous motors

Section Electric motors. Asynchronous motors are electrical machines that have at least two windings in which alternating voltages are phase shifted relative to each other. In asynchronous systems, it becomes possible to create a rotating magnetic field in a mechanically stationary device. A coil connected to an alternating current source produces a pulsating magnetic field, that is, a magnetic field that changes in value and direction. In a cylinder with an inner diameter D, three coils are placed on the surface, spatially displaced relative to each other by 120°. Coils connected to a three-phase voltage source ... >>

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Articles on residual current devices

Articles on protective shutdown devices; descriptions of residual current devices: 10 articles

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Regulatory documentation for an electrician

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In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

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Random news from the Archive

Fiber optic network as an earthquake predictor 30.10.2017

Earthquakes are one of the most destructive natural disasters. Sometimes even a few minutes of warning about them can be decisive. And now Stanford scientists have come up with an interesting proposal on how to create a truly global network for early earthquake detection.

Now such a system requires the installation of highly sensitive sensors that will measure the slightest tremors that can signal that a major disaster is near. But standard sensors can't cover everything, so a group of Stanford scientists came up with another solution: a fiber optic network.

Fiber optic cables transmit information at almost the speed of light and are used by telecommunications companies around the world. But they are also used by oil and gas companies to monitor small shocks caused by drilling equipment. With such measurements, a characteristic of cables called "backscatter" is needed, with the help of measuring the movement of cables and recording seismic events.

There is a laser at one end of the cable that sends out light. Part of the light hits impurities and defects in the glass walls of the cable and is reflected: this is the "backscatter" that was discussed. The signal received under such conditions can change depending on whether the part of the cable where the reflection occurred was moving, and fixing such signals can give scientists a map of seismic activity over a large area.

Typically, fiber optic detectors are attached to pipes or other equipment, but to detect earthquakes, researchers need loose cables, which is considered almost impossible, as most people think a loose cable will generate too many signals to be useful.

But by using a five-kilometer cable on the campus of the university itself, the researchers demonstrated that optical fiber is suitable for such purposes. With their network, they were able to detect about 800 seismic shocks, including an earthquake in Mexico and two small local earthquakes of 1,6 and 1,8.

This means that scientists can detect earthquakes using the already existing fiber optic network of communications companies. Of course, such cables are not as sensitive as traditional seismometers, but they are much cheaper and provide more area coverage.

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