SU750603A1

SU750603A1 - Device for connecting to preset wire

Info

Publication number: SU750603A1
Application number: SU782620210A
Authority: SU
Inventors: Владимир Николаевич Гречухин
Priority date: 1978-05-29
Filing date: 1978-05-29
Publication date: 1980-07-23

Description

(54) УСТРОЙСТВО ДЛЯ ВКЛЮЧЕНИЯ В ЗАДАННУЮ ФАЗУ(54) DEVICE FOR INCLUSION IN GIVEN PHASE

II

Изобретение относитс к электротехнике и может быть использовано в частности в коммутирующих аппаратах релейной защиты и автоматики.The invention relates to electrical engineering and can be used in particular in switching devices of relay protection and automation.

Известно устройство дл включени в заданную фазу, блок формировани управл ющих импульсов и коммутатор на симисторе 1.A device for switching in a predetermined phase, a control pulse shaping unit and a switch on the triac 1 is known.

Недостатком его вл етс гальваническа св зь между силовыми цеп ми и цеп ми управлени , а также необходимость использовани трехфазного питающего напр жени .Its disadvantage is the galvanic coupling between power circuits and control circuits, as well as the need to use a three-phase supply voltage.

Наиболее близким к предлагаемому по технической сущности вл етс устройство дл включени в заданную фазу, содержащее фазорегул тор, нагруженный на промежуточный трансформатор, блок управлени , вспомогательный тиристор и ключ на симисторе 2.Closest to the proposed technical entity is a device for switching on to a predetermined phase, comprising a phase regulator loaded on an intermediate transformer, a control unit, an auxiliary thyristor and a switch on the triac 2.

К недостаткам устройства относитс отсутствие возможности непрерывного контрол фазы включени .The disadvantages of the device include the inability to continuously monitor the inclusion phase.

Цель изобретени - непрерывный контроль фазы включени .The purpose of the invention is continuous monitoring of the inclusion phase.

Она достигаетс тем, что устройство дл включени в заданную фазу, содержащееIt is achieved by the fact that the device for inclusion in a predetermined phase, containing

фазосдвигающий мост, образованный вторичной обмоткой со средним отводом промежуточного трансформатора, конденсатором и резисторо.м, выход которого через компаратор соединен с управл ющим переходом тнJ ристорного ключа, св занного через оптроны с силовыми тиристорами, снабжено дополнительным компаратором, разв зывающими диодами и стрелочным индикатором, причем вход дополнительного компаратора соединен с одним из выводов вторичной об10 мотки промежуточного трансформатора, а стрелочный индикатор подключен к выходам компараторов через разв зывающие диоды .a phase-shifting bridge formed by a secondary winding with a middle tap of an intermediate transformer, a capacitor and a resistor, the output of which through a comparator is connected to a control junction of a triac switch connected to an optocoupler with power thyristors, equipped with an additional comparator, decoupling diodes and a pointer indicator, the input of the additional comparator is connected to one of the terminals of the secondary region of the coil of the intermediate transformer, and the dial indicator is connected to the outputs of the comparators through decoupling diodes.

На чертеже представлена схема устройства .The drawing shows a diagram of the device.

Устройство содержит фазосдвигающий мост, образованный вторичной обмоткой промежуточного трансформатора 1, конденсатором 2 и резистором 3, компаратор 4 и дополнительный компаратор 5, тиристорный The device contains a phase-shifting bridge formed by the secondary winding of the intermediate transformer 1, capacitor 2 and resistor 3, comparator 4 and additional comparator 5, thyristor

Claims

20 a key 6 connected to the output of the comparator 4 through a differentiating chain of capacitor 7, resistors 8 and 9, and diodes 10 and 11. Thyristor K1UTU 6 through a mechanical disconnector (button) 12 is connected to optocouplers 13 connected to power thyristors 14. Pointer indicator 15 through a divider of resistors 16 and 17 and is released, diodes 18 and 19 are connected to the outputs of the comparators. The device works as follows. A sinusoidal voltage shifted in phase relative to the mains voltage is applied to the input of comparator 4. At the output of comparator 4, rectangular voltage pulses are formed with a duration equal to half the period of the mains supply. The leading edge of rectangular pulses coincides with the moment of voltage passing through zero at the output of the phase-shifting bridge and its position is adjusted by resistor 3. With the help of a chain from capacitor 7, resistors 8 and 9, as well as diodes 10 and 11 from rectangular pulses from the comparator 4 output narrow control pulses are formed for the thyristor switch 6. Thus, with the disconnector 12 closed, the front of the pulse from the comparator 4 turns on the optocouplers 13, which in turn turn on the power thyristors 14. The optocouplers 13 feed the direct current and the thyristors 14 remain in the on state until the disconnector 14 is closed. At the output of the additional comparator 5, rectangular pulses are also formed with a duration equal to half the period of the mains supply. The leading edge of these pulses is combined with the moments of passage through the network voltage zero. The amplitudes of the pulses at the outputs of the comparators are the same; therefore, the dial indicator is affected by rectangular pulses, the duration of which is determined by the position of the leading edge of the pulses from the comparator 4 and the falling edge of the pulses from the co.parator. phase voltage at the output of the phase-shifting bridge. Accordingly, the average value of the current through the indicator, as well as its reading, is linearly dependent on the phase shift. In this way, the device makes it possible to establish and continuously monitor the switching phase with any given accuracy. In this case, the control circuits are galvanically isolated from the power circuits. The invention includes a device for switching into a predetermined phase containing a phase-shifting bridge formed by a secondary winding with an average tap of an intermediate transformer, a capacitor and a resistor, the output of which is connected via a comparator to a control transition of a thyristor switch connected through optocouplers with power thyristors, For the purpose of continuous control of the switching phase, it is equipped with an additional comparator, decoupling diodes and a dial indicator, and the input of the additional compass The switch is connected to one of the terminals of the secondary winding of the intermediate transformer, and the dial indicator is connected to the outputs of the comparators via isolating diodes. Sources of information taken into account in the examination 1. Shelest V. A. Phase-switching device. Lime University "Electromechanics, № 6, 1973, p. 693-695.

2. Timmermanis K. A. Greivulis Ya. P. Semiconductor phase switch. - Electric station number 3, 1971, p. 65-68 (prototype).