Selection and application of overhead (air) Low-voltage surge limiters
Introduction
The analysis of threats from cozy, attachment and induced surges, etc. should not be carried through outright in the field of closed facilities.
Inside the surge protection multistage framework, as the first level of protection, the antenna limiter class A (VDE 0675) must be provided. Therefore, the analysis of the overload protection must also take into account this degree of protection, the more that surges of supply constraints in a systematic application expands, offering for customers from time to time newer and better solutions parameters. An example of this type of solution is introduced limiting waves ETITEC type A, manufactured by TSI Polamar along with many versions of clamps (connectors), described on the back of this article.
Application of Class A limitation greatly improves the working conditions of the power grid and harmonizes perfectly nn cooperation surge protection with multiple new levels of protection (limiting the class B, C … etc.) Hence also the need to use protection things like the relationship with the following degrees of protection and also protection against surges on medium voltage networks.
Normalization terms
Until now, the purpose of investigation and classification of overvoltage limiters nn adopted standards, taking into account the lack of appropriate standards for low voltage limiters. These standards include: IEC 60099-1 and IEC 60099-4. These rules relate to the increase in spark-less rate limiting SN and WN (IEC 60099-4) and limiting spark (IEC 60099-1).
Standards that are compulsory in the whole range of overvoltage limiters nn are divided into two categories:
l – for protection devices;
ll – on applications.
L In the category of standards is Standard: VDE 0675, which first introduced the concept of surge protection multistage, but refers primarily to internal limiters, from class B. One of the keys to the classification in this case, installation is the limiter.
Secondly, and this from a legislative measure most important and mandatory, is the standard IEC 61 643, with modifications (Polish edition PN-IEC 61 643). One of the keys to the classification of devices (called in this case SPD – Surge protection devices), is the kind of evidence in the dependence of the internal construction: Class I, II or III trials. Class II instruments policy refers to requests for overvoltage limiters nn network power.
To this category belongs the NP-E-Standard 05100-1: 1998, referred to air power networks and "Surge Protection of electro-energy network. Document" executive councils "issued by PTPIREE, which are, in principle, then the document confirmed by the Department of Atomic Energy and Power – "Surge Protection Transient electro-energy network. Executive councils of the Regulations for the construction of electrical equipment. "These two documents, currently, the basis for the application of overvoltage limiters, including nn rate of increase of the limiters. A two documents described above belongs NP-IEC standard 60364-4-443. For surge protection, this standard applies, unless the problems that other so-called surges category but only to electrical installations in the premises, from overvoltage category I to IV.
Selection of specific limiters conditions of the power network
The correct selection of overvoltage limiters must consider at least the basic parameters that are:
• continuous voltage Uc (in the network depending on the type of food);
• Nominal discharge current;
• discharge peak current Imax (relatively imp);
• TOV waves of resistance;
• voltage level Up protection;
• Operating temperature range;
• gripper types of connections (connectors).
Ad. a) UC's ongoing work – this is the maximum effective AC voltage or constant voltage maximum that can be applied continuously to the limit. This voltage is equal to the rated voltage. This tension is very crucial to the vitality and effectiveness of the protection of varistor voltage limiters, which now are the most practical limitations. The rule set (PN-E – 05100-1) and "Executive Board" recommended for the limiters with Uc = 500 V, but "Executive Tips" supplement this information, which in secondary circuits of signaling and lighting, the use of limiters with Uc = 280V is permitted. Overvoltage limiters ETITEC type using these two voltage values, and Uc = 660 V. Selection rules given in both documents are limited, due to continuous working voltage defined depending on the type of Power Supply according to the formula:
Uc ≥ UmSURGE
If Um – is the highest value voltage between Phase, which may occur in normal work of the mains.
Ad. b) discharge rated current – This is the peak value in the current limiter 8 / 20 microseconds form. This value is used for classification of the test limiter in Class II and for packaging called the limiter in the Class A and II. A used value is 5 kA. A Etitec limiters are also available in version 15 A, whose use is described in chapter next.
Ad. c) the maximum discharge current Imax, this is the peak-current limiter in the form of 8 / 20 microseconds and size according to a sequence of test runs for class II. Imax value is greater than in (usually at least twice) and is declared by the manufacturer. This value is used to test for demonstrate good performance and thermal stability of the limiter. The selection of this parameter is, in principle, a secondary issue, because it is outside of the selection the above parameters, which is in. A Etitec Imax limiters have a value equal to 10 or 30 kA.
Ad d) TOV over-voltage (surge) This is called the dynamic (TOV – Temporary over-voltage) over-voltage and the standard PN-IEC 61643-1 is defined as follows: the maximum efficiency value stable alternation or excessive stress, which exceeds the maximum working voltage power grid during the defined period of time. Used surge arrester TOV should further increase resistance, which may appear in the mains outlet, according to the formula:
≥ UT UTOV
Where:
UT – Resistance to the limiter TOV voltage (kV)
UTOV TOV-over-voltage value, occur in the power network (kV)
Ad e) voltage protection level up is a parameter that characterizes the performance limiter in the range of voltage limiting efficiencies in terminals of the limiter. This value is given by the manufacturer. A general rule of selection is that, until the value of the limiter used in the open line wire was lower nn to 6 kV (for 230/400 V power grid), as a rule of thumb, limiters are significantly up best values, for example. And Etitec'a – To value. 2 0 kV (Uc = 500 V, In = 15
kA). The smallest to the value of the properties to improve the protection of the limiter. This care why it is always recommended especially in the selection of the lowest possible value as UC, because UC lower level, the better the liquidation value. Even the parameters of the ETITEC A limiter voltage are listed in Table 1.
Ad. f) Operating temperature refers to the resistance of over-voltage limiter for the weather non-performing (bad). This limitation requires construction 100% waterproof manufacturers, but also to implement suitable materials resistant to jumps temperature. The surge protector should have the wider work of wide temperature, which may be present in your work environment. The working temperature range of ETITEC A limit is found in the following ranges: from – 40 ° C to +80 ° C.
Ad. g) Tongs (linear) connectors, in reliance on the version, is intended other types of cables. Detailed solutions are shown in Table 4. In general, the different versions of the A-type limiter ETITEC are designed for mains with "naked" lines – without isolation or to the network of lines in the insulation (the kind AsXSn). Also available are "universal L (Fig. 5) version" exclusively serving for the exchange of limiters became worn after years' of operation and after many screw the "old one ", this version is screwed, without the need to exchange the complete set of all the brackets () connectors. The grounding clip () PE connector adapts to the direct connection to the grounding line of Al or Cu 25 mm2 flexible.
Implementation and installation tips
Fundamentals of open wire lines over-voltage limiters use are described in the aforementioned standard PN-E-05100-1, 1998 and in "Tips …" given by PTPiREE. In general, the complete set of overvoltage limiters must be installed in:
• SN / nn processors – in the secondary side of transformer (reasonable in this case isinstallation limiters with Uc = 500 V into account possible level of voltage fluctuations and with A = kA into account the cost of the transformer and skills considerably better to resist the energy absorbed by the limiter 15 kA and ultimately more effective protection of the transformer);
• each step line open wire in the cable, and vice versa;
• each open wire connection, unless the condition that surge limiters installed at a distance not exceeding 300 meters;
• If we deal with the extensive open wire line, we must respect the above condition 300 m, ie the distance between the complete sets of limiting does not exceed 300 meters;
• versions with the switch (O) Fig 2, which also serves as an indicator of failure, must be installed in places where certain sections of the network are reviewed, as to turn the devices on the ground short-circuit limiting damage if a short circuit caused by this type of limit can be "read-out" as a transitional phase short circuit and can remain without protection.
All the most important tips are:
• The distance between a limiter and a protected device should be smaller (eg, limiting transformers used for protection must be installed directly on the Processor);
• Special areas of ground lines should be not smaller than 10mm2 (Cu) and 16mm2
• Place connecting cables with a line limiter protected phase and earth should be as short as possible, because of postponements in the voltages of several hundred kV during flood flows percussion;
• limiters installed on the lines must be located in parts of the grounding line PE or PEN protection line of protection of neutrality. In other cases of ground shall be designed so that physical education or the cable is connected to the PEN clamp grounding limiter;
• Resistance of overvoltage limiters must be no greater than 10.,
• Versions of limiting the switch should be grounded through a line flexible (Thin wire). The use of the iron ring or rigid lines is unacceptable.
Conclusion
This article makes doubt the basic problems of the selection and use of open wire lines overvoltage limiters ETITEC type nn. Author did not collect the entire problem, because you can describe the case all the other problems such as: the origin and type of waves, the classification of overvoltage limiters compliance with PN-IEC 61643-1, description of evidence required for limiting the selection of energy-or durations coordination between the limiters and their use in power networks CC.
However, the author tried to demonstrate that the existing criteria simple and narrow the selection of overvoltage limiters open wire lines in the example ETITEC manufactured by ETIPolam A limiter. Also gave data base, which is very essential for the achievement of the correct selection. Are also essential tips on the use and installation. Special attention deserves the fact that these constraints are a requisite degree of protection in the idea of surge protection systems and multistage installation perfectly harmonizes and improves the work of the limiters is already used in building facilities.
Inz. Romano Kłopocki
href = "http://www.eti.si/en"> more About the Author
For decades, electronic equipment, computers, television and radio
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