SU554590A1

SU554590A1 - Device for automatic frequency unloading and frequency automatic reclosing

Info

Publication number: SU554590A1
Application number: SU2091755A
Authority: SU
Inventors: Вениамин Львович Фабрикант; Николай Сергеевич Гуров; Владимир Николаевич Чувычин; Ян Янович Приедитис; Нохум Симанович Маркушевич
Original assignee: Рижский Ордена Трудового Красного Знамени Политехнический Институт
Priority date: 1975-01-03
Filing date: 1975-01-03
Publication date: 1977-04-15

Description

иепи АЧР с зависимой выдержкой времени, указанна панель в силу дискретности сигнала измерительного органа не может обеснечить вынолнение АЧР с зависимой выдержкой времени, что вл етс функциональной ограниченностью устройства.Due to the fact that the panel is dependent on the discreteness of the signal of the measuring organ, it cannot ensure that the frequency response is dependent on the panel, which is a functional limitation of the device.

В р де случаев целесообразен контроль частоты носле работы ЧАПВ. В указанной панели контроль частоты после работы ЧАПВ не предусмотрен. Он потребовал бы дополнительного введени некоторой логики и реле частоты дл получени уставки контрол .In a number of cases, it is advisable to control the frequency of the CHAPV operation. In this panel, frequency control after CHAPV operation is not provided. It would require the addition of some logic and a frequency relay to get the control setpoint.

Потребление панели от измерительного трансформатора напр л ени определ етс числом реле частоты (необходимым числом уставок срабатывани ). Потребление одного реле частоты достаточно больше (пор дка 10 АВ). Увеличение требуемого числа уставок устройства приводит и к увеличению его габаритов .The consumption of the panel from the measuring transformer of the voltage is determined by the number of the frequency relay (the required number of setpoints). The consumption of one frequency relay is sufficiently large (on the order of 10 AB). Increasing the required number of device settings also leads to an increase in its dimensions.

Целью изобретени вл етс расширение функциональных возможностей устройства и уменьшение потребл емой им мощности от измерительного трансформатора папр л ени . Это достигаетс тем, что предлагаемое устройство снабжено пороговыми элементами по числу логических цепочек, логическим элементом И и интегрирующим элементом, причем вход и выход частотозависимого элемента включены па входы логического элемента И, выход которого через интегрирующий элемент св зан со входами пороговых элементов логических выходных цепочек. При этом логическа выходна цепочка, воздействующа на отключение потребителей с выдержкой времени, зависимой от частоты, снабжена пусковым пороговым органом, линейным усилителем, конденсатором с параллельно включенным разр дным резистором, элементом пам ти и зар дным резистором, причем входы линейного усилител и пускового порогового органа включены на выход интегрирующего элемента, выход линейного усилител подключен к выходному органу через последовательно включенные коммутирующий элемент пускового порогового органа, конденсатор , пороговый элемент, второй коммутирующий элемент пускового порогового органа и элемент пам ти, а между плюсовой шиной и первой обкладкой конденсатора включен зар дный резистор.The aim of the invention is to expand the functionality of the device and reduce its power consumption from the measuring transformer of the instrument. This is achieved by the fact that the proposed device is provided with threshold elements according to the number of logical chains, a logical element AND and an integrating element, the input and output of the frequency-dependent element being connected to the inputs of the logical element AND, the output of which through the integrating element is connected with the inputs of the threshold elements of logical output chains. At the same time, the logical output chain acting on disconnection of consumers with a time-dependent frequency dependent is equipped with a starting threshold organ, a linear amplifier, a capacitor with a parallel-connected discharge resistor, a memory element and a charging resistor, and the inputs of the linear amplifier and the starting threshold organ connected to the output of the integrating element, the output of the linear amplifier is connected to the output organ through a series-connected switching element of the starting threshold organ, The switch, the threshold element, the second switching element of the starting threshold organ, and the memory element, and the charging resistor is connected between the positive bus and the first capacitor plate.

Дл обеспечени возможности регистрации аварийного процесса изменени частоты устройство дополнительно содержит линейный усилитель, вход которого подключен к выходу интегрирующего элемента, и регистрирующий прибор, подключенный к выходу усилител .To make it possible to register an emergency process of changing the frequency, the device further comprises a linear amplifier, the input of which is connected to the output of the integrating element, and a recording device connected to the output of the amplifier.

Такое соединение элементов позвол ет получить необходимое количество уставок по частоте с одновременным снижением потреблени и уменьшением габаритов устройства благодар использованию одного частоточувствительного элемента дл всех уставок.Such a combination of elements allows one to obtain the required number of setpoints in frequency with a simultaneous decrease in consumption and a decrease in device dimensions due to the use of a single frequency sensitive element for all settings.

Выполнение частоточувствительного элемента на активном полосовом фильтре значительно снижает потребление всего устройства АЧР по сравнению с потреблением одного реле частоты РЧ-1.Performing a frequency sensitive element on an active bandpass filter significantly reduces the consumption of the entire AChR device as compared to the consumption of a single RF-1 frequency relay.

На чертеже дана блок-схема описываемого устройства.The drawing is a block diagram of the described device.

Устройство содержит стабилизатор 1 напр жени , служащий дл получени стабильногоThe device contains a voltage stabilizer 1 serving to obtain a stable

по величине и синусоидального по форме напр лчени и состо щий из ограничител 2 амплитуды и полосового фильтра 3; частоточувствительный орган 4, содержащий частоточувствительный элемент (активный полосовойlargest and sinusoidal in shape and consisting of a limiter of 2 amplitudes and a band-pass filter 3; frequency sensitive organ 4 containing a frequency sensitive element (active band

фильтр) 5, логический элемент И б и интегрирующий элемент 7; логическую часть 8 категории АЧР с зависимой выдерж1кой времени, включающую в себ линейный усилитель 9, пусковой пороговый орган 10, коммутирующийfilter) 5, the logical element And b and the integrating element 7; logical part 8 of the AChR category with a dependent time lag, which includes a linear amplifier 9, a trigger threshold element 10, commuting

элемент 11 пускового порогового органа 10, конденсатор 12 с разр дным резистором 13, пороговый элемент 14, второй коммутирующий элемент 15 пускового порогового органа 10, элемент пам ти 16 и зар дный резисторelement 11 of starting threshold organ 10, capacitor 12 with discharge resistor 13, threshold element 14, second switching element 15 of trigger threshold organ 10, memory element 16 and charging resistor

17; выходной орган 18; логическую часть 19 категории АЧР-11, состо щую из порогового элемента 20, элемента 21 выдержки времени, элемента пам ти 22 и выходного органа 23; логическую часть 24 категории АЧР-1, состо щую из порогового элемента 25, элемента пам ти 26 и выходного органа 27; логический элемент ИЛИ 28; логическую часть 29 ЧАПВ, состо щую из порогового элемента 30, логических элементов И 31-33, элементов 34-17; output authority 18; the logical part 19 of the AChR-11 category, consisting of the threshold element 20, the time delay element 21, the memory element 22 and the output organ 23; the logical part 24 of the AChR-1 category, consisting of the threshold element 25, the memory element 26 and the output body 27; logical element OR 28; the logical part 29 CHAPV consisting of the threshold element 30, logical elements And 31-33, elements 34-

36 выдерж1кн времени И выходных органов 37-39; линейный усилитель 40 и регистрирующий прибор 41.36 soak1kn of time And output organs 37-39; linear amplifier 40 and recording device 41.

Выходные органы схемы воздействуют на исполнительные устройства.The output of the circuit affects actuators.

Элементы 1, 4, 8 и 18 позвол ют получить АЧР с зависимой выдержкой времени; элементы 1, 4, 19 служат дл получени категории АЧР-Н; элементы 1, 4 и 24 позвол ют получить категорию АЧР-1; элемент 28 служит дл получени категории АЧР - совмещенна ; элементы 1, 4 и 29 служат дл обеспечени ЧАПВ; элементы 1, 4, 40 и 41 позвол ют произвести регистрацию аварийного процесса изменени частоты в системе.Elements 1, 4, 8, and 18 allow you to get time-dependent frequency response systems; elements 1, 4, 19 serve to obtain the category of AChR-N; elements 1, 4, and 24 allow you to get an AChR-1 category; element 28 serves to obtain the category of AChR - combined; elements 1, 4 and 29 are used to provide CPAPs; Elements 1, 4, 40, and 41 allow the registration of an emergency process for changing the frequency in the system.

Устройство работает следующим образом. Напр жение L/i от измерительного трансформатора напр жени подаетс на вход стабилизатора 1. При изменении величины и формы кривойThe device works as follows. The voltage L / i from the measuring voltage transformer is fed to the input of the stabilizer 1. When the magnitude and shape of the curve changes

напр жени f/i выходное напр жение стабилизатора не измен етс по амплитуде и имеет синусоидальную форму. Напр жение Uz подаетс на частоточувствительный элемент 5 и элемент И 6. В свою очередь выходное напр жение Us подаетс на вход элемента И 6. При изменении частоты напр жени t/i измен етс фаза между напр жени ми f/2 и 1/3, вследствие чего измен етс длительность пр моугольных импульсов напр жени на выходеf / i voltage the output voltage of the stabilizer does not vary in amplitude and is sinusoidal. The voltage Uz is applied to the frequency sensitive element 5 and the element AND 6. In turn, the output voltage Us is applied to the input of element AND 6. When the voltage t / i frequency changes, the phase between voltage f / 2 and 1/3 changes, as a result, the duration of the rectangular voltage pulses at the output

Claims

element 6. The rectangular pulses from element 6 are fed to the integrating element 7. In the presence of a rectangular pulse, the capacitor of element 7 is charged, and in the absence of a pulse, its discharge occurs. On the capacitor of element 7, a definite value is established depending on the duration of the pulses. this voltage. Consequently, at the output of the element 7, there is a constant voltage t / o depending on the frequency. This voltage is applied to the inputs of the normative devices having different response levels. When the voltage (frequency) reaches the actuation level (the frequency response setpoint), the corresponding normal element is triggered. When triggering threshold element 10 is triggered, contacts 11 and 15 are simultaneously closed. By contacts 11, the first plate of capacitor 12 is connected to a linear amplifier 9, supplying the sum of voltages across the capacitor and amplifier to the input of threshold element 14. If at the moment of contact closure 11 the input voltage of the element 14 is equal to or greater than its actuation level, then the element 14 triggers instantly and through the closed contacts 15 sends a signal to memory element 16, which also activates and through the output organ 18 sends a signal "Output 1 to disconnect consumers . If at the moment of contact closure 11 the input voltage is less than the response level of the element 14, then the element 14 is in an inoperative state and the signal "Output 1 is absent. The capacitor 12, discharging through the resistor 13, changes the value of the input voltage of the element 14 at a constant voltage at the output of the amplifier 9, and after the time when the input circuit is equal to the level of the operation of the element 14, the element 14 also works through the elements 15 and 16 and the output body 18 generates a signal "Output 1 to disconnect consumers. If the voltage at the output of amplifier 9 changes (the frequency changes), the voltage at the capacitor at which the element 14 is triggered, and consequently, the response time of the element 14 and the entire AChR device, will change. When the network frequency is equal to the start-up setting of АЧР-И, element 20 is triggered and the element 21 time delay starts counting. After a given element 21 time expires, elements 22 and 23 are triggered after the specified time delay has elapsed. . At a mains frequency equal to the response setting of AChR-1, element 25 is triggered and, through elements 26 and 27, the signal "Output 3 is applied to disconnect consumers. If the logic element OR 28 is connected to the outputs of elements 23 and 27, and the output signal “Output 4 is applied to disconnect the consumer, then this circuit works as ACh.R - combined. When the trigger element 30 is triggered at a frequency equal to the set of CHAPV, signals are simultaneously sent to three elements AND 31-33. The element AND triggers, at the input of which the second signal is given, indicating the operation of the corresponding category of frequency response. These signals arrive at elements 31-33 from memory elements 16, 22, and 26, respectively. From the outputs of elements 31-33, signals are sent to start up elements 34-36 of the time delay of the QPST, respectively, after the set time delays, output bodies 37-39 are triggered, giving signals to remove us, switching off elements 16, 22 and 26 and to switching on users ( “Exit 5,“ Exit 6 and “Exit 7). A constant value proportional to the frequency deviation from the nominal value is output from element 7 through a linear amplifier 40 to a recording device 41, such as an emergency recording oscilloscope. Frequency control after CHAPV operation has not been entered into this scheme. The introduction of control in this case does not cause much complications of the scheme. It is only necessary to add a few logical elements and connections, and the setpoint can be obtained at the threshold element 1te 30 CHAPV. At present, time-dependent frequency response systems are not applied due to the lack of special equipment. The use of AChR with a dependent time delay improves the quality of the accident (less redundant customer disconnections, reducing the operating time of the power system with a reduced frequency, compliance with the established principle of responsibility). Reducing the consumption of an AChR device with CHAPVs from measuring transformers of the voltage of substations leads to their significant unloading. Claim 1. Device for automatic frequency unloading and frequency automatic reclosing containing a frequency-dependent element, such as an active band-pass filter, logic output chains iKH, acting through output organs, shutting down non-time and time-sensitive consumers, and a logical output chain acting on the inclusion of consumers, characterized in that, in order to extend the functionality and reduce the consumption of power, it is provided with elements by the number of logical chains, the logical element And and the integrating element, and the input and output frequency-dependent

the element is connected to the inputs of the logical element I, the output of which through the integrating element is connected with the inputs of the threshold elements of the logic output chains.

2. The device according to claim 1, characterized in that the logical output chain, acting on the disconnection of consumers with a time-dependent frequency dependent, is equipped with a trigger threshold unit, a linear amplifier, a capacitor with a parallel-connected discharge resistor, a memory element and a charging a resistor, with the inputs of the linear amplifier and the starting threshold organ connected to the output of the integrating element, the output of the linear amplifier is connected to the output organ through a series-connected switching element p Skov threshold body condenser threshold element, the second switch element threshold trigger body and a memory element, and between the positive and N1INOY first capacitor plate included a charging resistor.

3. The device according to claim 1, characterized in that, in order to enable the registration of an emergency process of frequency change, it further comprises a linear amplifier, the input of which is connected to the output of the integrating element, and a recording device connected to the output of the amplifier.

Sources of information taken into account in the examination:

1. Guidelines for automatic frequency unloading. Publication of a specialized center for scientific and technical information of ORGRES, 1972.

2.A. B. Barzam "System Automation, ed. “Energie, 1973, p. 111.

3. The author's certificate number 369658, M. Kl.2 N 02J 3/24, 1973.

4. Panel device AChR and CHAPV. The standard project of the Central Asian branch of the VGPI and the scientific research institute "Energosetproekt, Inv. No. 3459TM-1.