Break- relay based on widespread " Breaker "

Description development

All of this is a significant drawback of the thermal release.Looking ahead, it must be said that the organization of these contacts the remote control allows you to replace the conventional bimetallic plate, and the current management to carry out with the help of an electronic sensor and a corresponding key scheme.The result is a full-featured release with good performance.But, it is in the long term, and now consider a model designed for the voltage protection devices.current protection Indicators remain in it the same as in the original breaker.

For testing and presentation of two experienced modifications break two relay protection device has been manufactured on the basis of overvoltage 3 rosette splitter company VI-TOK, without simultaneous stop.The photo below shows the complete set of break-relay before final assembly.As shown below, the relay is overdue and without automatic return control to the original state, that is, with one electromagnet.

miniature electromagnets have the most cost-effective (cost) structure.Magnetic circuits are made of soft galvanized strip 20h0,75 mm (suitable and tare bar), the cores - from d5 wire (d6), coil winding wire is made of 0.1 mm.We have already noted that both circuit protective device with a break-switch turns the simplest and most reliable.It does not contain any high-power element and a single electrolytic capacitor, that is, has the most large resource.The standby consumption is 0.5 - 0.8 watts.Below are photos of the internal installation of protection devices with and without Auto Return Auto Return and payment of the second of these, which are well demonstrated constructive simplicity.

noted earlier that automatic reset standby status is required mainly for refrigerators.Here I must say that it is useful for computer equipment connected to the uninterruptible power supply (for this kit), and for other equipment - such as for video surveillance systems.At the same time, auto reset for TVs and other audio and video - art is not required.Thus, the two models are seen relevant break switch and accordingly the following models of safety devices:

1. filter-splitter model with cut-off the power and manual reset, and a similar model, but with Auto Return.
2. Synchronous limiter (ONS) with avtootsechkoy and manual reset, and Auto Return.

Models according to claim 1, as well as produced now filters are suitable only for stable urban networks.It should be noted that such a model, but to break the relay has the greatest efficiency.It may be absent, and the input switch as structurally simple to install button for the electromagnet break relay - electrical or mechanical.Auto return to the submitted design does not exclude manual reset, - he becomes redundant.

Here we should note another positive difference protection devices based on break-switch from existing use as a normal trip relays.protection device must be rated for the input voltage of the alarm up to 380 volts, since the probability of such an accident in electric albeit low but still constantly takes place, and it is very great destructive effect, the cost of large losses.So relay protection, or rather the scheme of protection in existing devices are usually not designed for this voltage (as substantially increased costs).Manufacturers do not provide any guarantees for such a case.

difference break relay is that it instantly, for 2 - 3 ms off everything that is triggered as the current machine.With regard to Auto Return scheme, it must be said that its cells operate at currents less than 2 - 3 mA and have an adequate supply voltage.That is, unlike the relay circuit, elements to heat much less.The excess voltage in the chain of control of the input voltage is released through the classical current limiting circuit using a low-power high-voltage transistor is shunted by a resistor of about 100 ohms.

should be noted that in the circuit Auto Return used neon light, which in addition to the basic function is useful because it allows you to document (act of witness) to fix the fact prolonged presence of unacceptably high voltage network (for damages over unsecured areas of the power, including inneighbors through the courts).Here it is necessary to draw attention to the fact that the issue of compensation for the damage caused by overvoltage in the network (due to the high price of modern equipment and especially its repair) must be understood and studied by each user in advance.

legal side of this, we can say, the problem of our knowledge requires a serious work of relevant departments.But, whatever the legal solutions, technical protection devices must ensure that the fixation of fact inappropriate overstatement mains voltage, and legal confirmation of this fact must be carried out by the technical service expertise.It can do, obviously, and service centers for warranty service and repair of safety devices.Many modern devices have a digital voltage tester, but in this case requires an expert opinion on the accuracy of the measurement and protection of the health of the device, that is, the technical confirmation of the surge.This theme is relevant and it is useful to consider separately.It is left to complete the story of the new development - break switch.

As before, in order to masters Council, I must say that the length of the cut-off referred to above was measured in the tests by RC - chain connected for this purpose to the electromagnet.By measuring the voltage across the capacitor after the pulse cutoff and knowing the charging time constant and the fact that operation takes place in the top half-wave, it is possible to calculate an approximate cutoff pulse duration, ie the time from the opening to de-energize the thyristor.

Tests break relay

wishes to see the test of the models can here download these files:

view they should be with a normal level of sound.In tests break switch Use recommended me earlier with a conventional transformer winding voltage boost and resistor voltage regulator.Resistor shunted triac key to provide a current pulse solenoid shut-off and return (about 6 A).Pushbutton test cutoff the same as in the synchronous limiter.Shutter speed is measured in the auto reset after a voltage drop of less than the cutoff point and is a few seconds.Longer exposure requires the use of an electrolytic capacitor - enough reliable element, and the shutter speed more than an hour (for refrigerator) and more complicated circuit.

In this respect, it should be noted that the real, - without any protection devices is always likely disappearance of the power for a few seconds or less (for example, due to poor contact or accidental shutdown of general machine).Therefore, all equipment must be designed by the manufacturer to a power interruption.Longer delay is required only for special equipment, such as certain refrigerators.Then it is necessary to connect them via a special time switch, which - among other things, have to supply themselves manufacturers (than to shift it on to consumers, forcing them to acquire special protection devices).But it is from the engineering point of view.And from the point of view of the consumer, not the limited in the media, should be, of course, the opportunity to purchase the security device model with a wide range of time delay, until off Auto Return.This is done, by the way, in many types of stabilizers, - the corresponding amount and the number of disadvantages mentioned earlier.

If you are interested in break-switch, you can ask for more information by email [email protected] (Alexander Vasilyev, an engineer-designer).