SU779945A1

SU779945A1 - Line model for testing switches in the mode of cut-out off-load lines

Info

Publication number: SU779945A1
Application number: SU782699288A
Authority: SU
Inventors: Александр Константинович Быструев
Original assignee: Научно-Исследовательский Центр По Испытанию Высоковольтной Аппаратуры
Priority date: 1978-12-19
Filing date: 1978-12-19
Publication date: 1980-11-15

Description

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Изобретение относитс к области электроизмерительной техники и может быть использовано при создании устройства дл испытани высоковольтных выключателей .5The invention relates to the field of electrical measuring equipment and can be used to create a device for testing high-voltage circuit breakers. 5

Известны искусственные линии, выполненные в виде цепных схем из одинаковых П или Т-образных звеньев, со .держащих резисторы и конденсаторы Ij.Artificial lines are known, made in the form of chain circuits from identical P or T-shaped links containing resistors and capacitors Ij.

Недостатком этих устройств вл - 10 етс невысока точность воспроизведени волнового процесса. The disadvantage of these devices is the low accuracy of reproduction of the wave process.

Наиболее близкой по технической сущности вл етс модель линии дл испытани высоковольтных выключате- 5 лей в режиме отключени ненагружеиных линий, содержаща реакторы и конденсаторы 12 .The closest in technical essence is the line model for testing high-voltage circuit breakers in the disconnection mode of non-flexible lines, containing reactors and capacitors 12.

. Недостатком этого устройства вл етс необходимость включени большого 20 числа звеньев дл улучшени приближени характеристики модели и характеристики замещаемой линии.. A disadvantage of this device is the need to include a large 20 number of links to improve the approximation of the model characteristic and the characteristic of the replaced line.

Целью изобретени вл етс повышение точности приближени к характе- 25 ристике замещаемой линии и сокращение числа элементов.The aim of the invention is to improve the accuracy of approximation to the characteristics of the replaced line and reduce the number of elements.

Дл достижени этой цели известна модель дл испытани выключателей в режиме отключени ненагруженных линий JQTo achieve this goal, a well-known model for testing circuit breakers in the mode of disconnection of unloaded JQ lines.

содержаща реакторы и конденсаторы, снабжена резисторами по числу реакторов , а конденсаторы и реакторы соединены по схеме последовательно включенных Г-образных звеньев, в которых конденсаторы включены в продольные ветки Гтобразных звеньев, реакторы в поперёчнйе ветви, а резисторы подключены параллельно реакторам.containing reactors and capacitors, equipped with resistors according to the number of reactors, and capacitors and reactors are connected according to the scheme of series-connected L-shaped links, in which the capacitors are included in the longitudinal branches of the GT-shaped links, the reactors are in the transverse branch, and the resistors are connected in parallel to the reactors.

На чертеже представлена электрическа схема модели линии. Она содержит последовательно .соединенные Г-образные звень 1, 2 и 3, в продольных ветв х которых включены конденсаторы 4, 5 и 6, а в поперечных ветв х - реакторы 7, 8 и 9, шунтированные резисторами 10, 11 и 12, суммарное сопротивление которых при их параллельном сложении равно волновому сопротивлению замещаемой линии,The drawing shows an electrical circuit of the line model. It contains serially connected L-shaped links 1, 2 and 3, in the longitudinal branches x of which are included capacitors 4, 5 and 6, and in the transverse branches x - reactors 7, 8 and 9, shunted by resistors 10, 11 and 12, total the resistance of which, when they are added in parallel, is equal to the wave resistance of the replaced line,

Модель линии получена ;реализации входного сопротивлени ненагпуженной линии в виде двухполюсника лестничного типа. Как известно, входное сопротивление ненагруженной линии имеет вид:The model of the line was obtained, the implementation of the input impedance of the unstressed line in the form of a ladder-type two-terminal. As is known, the input impedance of the unloaded line has the form:

z(p)(-Vtcrp)z (p) (- Vtcrp)

Claims

where Z (p) is the wave resistance; L, C - inductance and capacitance C, responsibly (Not loaded line} p - Laplace operator. Representing Z (p) as ratios and performing an algebraic division, we get an expression for a continued continued fraction; -pc - nrr i3 i: -ff. .. v, Expression (2) is realized as a two-pole ladder type, the reactor inductance of the k-th link (k 1,2,3 ...} is equal to ((.-4К-1 and the capacitor capacitance: ..; From the expression (2) it follows that in the general case for the realization of an unloaded line in the form of a ladder-type two-terminal network, an infinite number of links are required. However, due to Since the inductance of reactors and the capacitor capacitance capacitance decrease with increasing number of links, it is possible to obtain simulation accuracy that is acceptable for practical testing at 5-6 links x. If reactors are additionally shunted with resistors, as shown in the drawing, then 3-4 links. A line model can be used in direct and synthetic circuits for testing high-voltage circuit breakers in the off-line mode with sufficient accuracy for reproducing the characteristics of the replaced line. Claims; -----one --- -.----- -.- -- -.---. -, .. A line model for testing circuit breakers in the unloaded line disconnection mode, containing reactors and capacitors, characterized in that, in order to improve the accuracy of approximation to the characteristics of the replaced line and reduce the number of elements, it is equipped with resistors for the number of capacitors, and The reactors are connected according to the scheme of series-connected L-shaped links, in which capacitors are included in the longitudinal branches of the L-shaped links, the reactors are in the transverse branches, and the resistors are connected in parallel to the reactors. Sources of information taken into account in the examination 1. Kaplan V.V., Nashatyr V.M. Switching tests of high-voltage devices. L., Energie, 1966, p. 71

2. Authors certificate of the USSR 189486, cl. G 01 R 31/32, 21.07.65 (prototype).

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