Webinar «Surge protection of low-current lines (signal, control, data transmission, telephone etc.), part 2», page 3

The 5th webinar about Surge Protection

Webinar text. Page 3

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— The next element is designated as MP GDT Ad-Ad-Pg ST it is again two protection cascades, used for protection of zones 0В – 1, like the previous ones. The high discharge capacity for this element means that it limits the partial lightning currents to 2.5 kA. Tests category D1. Low voltages of triggering, low level of protection: line - line and line - PE. Even lower than the previous element - this is of great importance to us. Here the maximum operating frequency reaches 1 MHz, that is, low, 3 MHz or 6 MHz. We should be guided by these parameters when we know the operating frequency in this standard.

— The next group of elements is more interesting for places where such protection concerns large systems. For example, I meet such places where there is a multicore cable, where there are many cores and control systems, for example, from the high-voltage field of a substation in the building where the equipment is located to protect this line, to control power lines. There, as you know, and those who do not know, there are hundreds and even thousands of cable cores. If this is so, then the problem immediately appears: where to place such a number of protection elements and you want to install overvoltage protection, because it is clear that these will be huge cabinets. In this case, it is recommended to use elements of the MP RK series - narrow-body surge arresters.

— Sorry for the Polish language, just did not have time to translate it, but the next time I will add information about the measuring systems. I will add the translated information into Russian. But here everything is similar, the nominal wide range is from 5 to 170 V. For this element, look at what these designations look like, as in the previous series of lines. For use at the boundary LPZ 0В - 2, that is, higher than 1 and higher already for sensitive systems. For example, at the cable entry to the control room, to the server room and similar sensitive and very strategic places. Parameters are the same as in the previous item, so we will not consider them.

— In the catalog we will find the following series. I will not specify the following standards for the following elements. I will only show what you can find in the catalog, because in each of such series you need to add additional information. It takes a lot of time. Here, however, in Polish, but the schemes, they are as always international. This element is a series of surge arresters, which are installed in an open area, therefore, they are performed this way. This is typical for this kind of elements. This element can withstand even intrinsically safe areas, but it is now on the next test, and the standards have changed. Until we can boast, soon we should get the test results. Such elements are installed, for example, somewhere in a remote place, we install them in thermal power plants in convenient places where temperature sensors were somewhere outside, very long cables, and these sensors very often failed. After the protection of such elements, everything calmed down, then we had no more problems. But it is important here, if we include such an element, that is, we connect to a measuring sensor, we must remember that we carry some additional error into the measuring system. And in this case, we must carefully select all the parameters of all the elements, that is, the capacity, and the series-connected resistor. We must calculate how much the measurement error of this system will change.

— These elements are made in metal cases. This should be clear to everyone, because then the case is an additional screen. If we correctly separate the input side of the cables and the output side of the cables with a special metal partition, we screen the effect of these input currents, overvoltages from the protected side. Here is a special element, its maximum frequency is 250 MHz.

— The fifth category is 100 Base T.

— See slide 38. This year is still the sixth category. We will also show you at the following webinars, there are the same elements.

— And the last slide that shows a huge variety of security elements - radio communication systems. These elements are also used for television protection systems. Today we will not deal with this, let's talk about such elements and the method of their placement in the next webinar. This will take at least an hour and a half. If there is such a need, please write questions, we will take this into account. I have a presentation ready in Russian, it is very interesting, but I'm not sure that it will be interesting for all listeners. Today I finish, thank you very much for your attention! Time is running, an hour is not enough. In practice, I, perhaps, have spoken about one series thoroughly, but this is what I showed. I think that it shows you the variety of security elements that are directly appear in alarm systems in many situations. If you take up the protection of such systems, you need to examine the catalog carefully and consult with the supplier of the elements, ask questions to avoid mistakes. I am ready to answer question if you have any.

— Miroslaw, thanks for the report! Everything was meaningful and understandable, so no questions were received in the chat. Dear colleagues, thank you for participating in the webinar. If there are questions, please ask them in the chat, we will wait another minute. If there are no questions, they will appear later, then send them to the email address that I sent to the chat. Register for our next webinars, the schedule has increased, there are new webinars. Video recording of this webinar will be available on the website within a week, video recordings of previous webinars are also available on the website. No questions, we can finish. Many thanks to everyone for visiting our webinar! See you soon! Good bye!

— Thank you very much! Thank you all for your attention! Good bye!

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