SU920938A1

SU920938A1 - Active power relay

Info

Publication number: SU920938A1
Application number: SU792849107A
Authority: SU
Inventors: Виктор Митрофанович Шевцов
Original assignee: Чувашский государственный университет им.И.Н.Ульянова; Предприятие П/Я А-7374
Priority date: 1979-10-29
Filing date: 1979-10-29
Publication date: 1982-04-15

Description

(54) РЕЛЕ АКТИВНОЙ МОЩНОСТИ(54) ACTIVE POWER RELAY

1one

Изобретение относитс .к электротехнике и может быть использовано в устройствах релейной защиты и автоматики энергосистем в качестве реле перегрузки генераторов и реле обратной активной мощности.The invention relates to electrical engineering and can be used in devices for relay protection and automation of power systems as a generator overload relay and a reverse active power relay.

Известно реле активной мощности, измерительный блок которого функционирует по уравнению. .Known relay active power, the measuring unit which operates according to the equation. .

Vx H J t 4 -IV-Vl« 3 Vx H J t 4 -IV-Vl "3

rfleJcosi - активна составл юща тока; переменна составл юща выходного напр жени .rfleJcosi - current component is active; variable output voltage component.

Реле содержит также трансформатор с двум вторичными обмотками и два встречно включенных на выходе выпр мител 1,The relay also contains a transformer with two secondary windings and two counter-switched on output of the rectifier 1,

Недостатком его вл етс низка ; точность порогов срабатывани по мощности , так как фактически.измерительный блок вьщел ет сигнал, прсЗпорциональный не активной.мощности, а активной составл ющей тока, причем не во всем диапазоне изменени напр жени . I T1VI rotThe disadvantage of it is low; the accuracy of the thresholds for response to power, since in fact the measuring unit produces a signal that is not proportional to the active power, but to the active component of the current, and not in the whole range of voltage variation. I T1VI rot

Известны реле мощности типа РМ 1, Однако они также имеют ограниченную точность, конструктивно сложны и не технологичны, так как требуют в двух каналах блока измерени мощности идентичных обмоток, резисторов и квадраторов.The power relays of the type PM 1 are known. However, they also have limited accuracy, are structurally complex and not technological because they require identical windings, resistors and quadrants in two channels of the power measurement unit.

Наиболее близким по технической. сущности и достигаемому эффекту к предлагаемому реле вл етс реле обратной мощности, содержащее промежуточные преобразователи переменного тока и напр жение, фазочувствительный выпр митель с одним сглаживающим фильтром и неуправл емый выпр митель переменного напр жени с другим сглаживающим фильтром, а также последовательно включенные вычитатель , пороговый элемент, орган вы15 .держки времени и выходной релейный элемент 3.The closest technical. The essence and achievable effect of the proposed relay is a reverse power relay containing intermediate AC and voltage transducers, a phase sensitive rectifier with one smoothing filter and an unregulated alternating voltage rectifier with another smoothing filter, and a series-connected subtractor, a threshold element , body time device and output relay element 3.

Недостатком этого реле вл етс погрешность срабатывани по активной мощности, котора возрастает квадратично при отклонении напр жени от номинального значени .The disadvantage of this relay is the actuation error for active power, which quadratically increases when the voltage deviates from the nominal value.

Цель изобретени - повышение точности реле.The purpose of the invention is to improve the accuracy of the relay.

Claims

The goal is achieved by the fact that the active power relay contains an intermediate AC converter connected by an output to one input of a phase-sensing rectifier, the output of which includes one smoothing filter. an intermediate voltage converter connected to another input of the phase-sensitive rectifier, as well as to the input of the uncontrolled rectifier, at the output of which another smoothing filter is turned on, and sequentially switched on, time delay organ and output relay element, additionally introduced nonlinear block with inversely dependent on the input voltage or pass characteristic, while the input of the nonlinear block is connected to the output of another smoothing filter, and The output and output of the smoothing filter at the output of the phyosensitive rectifier are connected to the inputs of the reader. The drawing shows the functionality of the active power relay circuit. The relay contains intermediate current transducers 1 and voltage 2, connected to them a phase-sensitive rectifier 3 with a smoothing current. filter 4 at the outlet, uncontrolled. rectifier 5. alternating voltage with another smoothing-out filter 6, the output of which included a non-linear unit .7 with a pass-through characteristic that is inversely dependent on the input voltage, and a series-connected subtractor 8, threshold element 9, time delay organ 10 and output relay element 11. The relay operates as follows. If there is a sinusoidal current (uH.-4) at the inputs of the relay and a voltage, sin (lU-t), the output of the phase sensing rectifier 3 causes a voltage, j (lt) (a) t-4; -si jriiJsiCj3oosLf4U-, which, after filter smoothing, contains practically only the coater, is proportional to the active component of the current K JDCOS K. At the output of the uncontrolled rectifier 5, a voltage is generated and g (t). Sicfn y, which, after being smoothed by another filter b, contains a component proportional to the absolute value of the voltage being measured, Y. The output nationalization of the non-linear unit 7 is inversely related to the input voltage level. - and - UT V with the help of the subtractor 8, the voltage of the output of the filter 4 and the voltage on the high voltage of the nonlinear block 7 are calculated by the ID of the backflash-Sob-condition of the threshold element 9 at the same time KyZOos f- 7.0. and is completely equivalent to the following relation K ,, VO.cosif-Co7 / o, which accurately expresses the mathematical function of the active power relay to trigger when the active value of the active power is reached, the value and the set point C. Thus, the introduction of a nonlinear block with an inverse-dependent input Voltage by the PASSING characteristic and its corresponding connection provide high accuracy of the active power relay operation. Claims of the Invention An active power relay containing an intermediate AC converter, with an output to one input of a phase-sensitive rectifier, the output of which includes one smoothing filter, an intermediate converter-alternating voltage, connected by an output to another input of the photosensitive rectifier and also to the input of the uncontrolled rectifier, at the output of which another smoothing filter is included, and the successively connected subtractor, the threshold element, the extracting organ in and an output relay element, about which it is so that, in order to improve accuracy, a nonlinear unit with an inverse-dependent input voltage is also introduced into the relay, while the input of the nonlinear unit is connected to the output of another of the smoothing filter, and its output; And the output of the smoothing filter at the output of the phase-sensitive rectifier is connected to the inputs of the subtractor. Sources of information taken into account during the examination 1. USSR author's certificate No. 315242, cl. H 02 H 3/42, 1970.

2. Relay active and reactive power semiconductor types RM-53, RM-404. Technical Description and Operating Instructions OLH.140.078, 1973.

3. Semiconductor reverse relay, power. - Instruments and systems 1973, No. 12, p. 42-44. management