SU1000937A1

SU1000937A1 - Device for forecasting transformer insulation resource consumption

Info

Publication number: SU1000937A1
Application number: SU813350854A
Authority: SU
Inventors: Владимир Васильевич Овчаров; Виктор Яковлевич Жарков; Игорь Николаевич Новиков; Анатолий Яковлевич Чураков
Original assignee: Мелитопольский Ордена Трудового Красного Знамени Институт Механизации Сельского Хозяйства
Priority date: 1981-10-27
Filing date: 1981-10-27
Publication date: 1983-02-28

Description

Изобретение относится к электроизмерительной технике и может быть использовано для прогнозирования расхода ресурса изоляции силового трансформатора с учетом предполагаемого графика загрузки и температуры окру- ⁵жающей среды.The invention relates to electrical engineering and can be used to predict resource consumption power transformer isolation with regard to the intended load schedule and surrounded ⁵ kg Ambient temperature.

Известно устройство для измерения ресурса работы силового трансформатора, содержащее однофазный счетчик электрической энергии, токовая обмотка которого подключена к выводам автотрансформатора через контакты температурного или токового реле, контролирующие фактическую загрузку тран-₁₃сформатора [jJ .A device is known for measuring the operating life of a power transformer, which contains a single-phase electric energy meter, the current winding of which is connected to the terminals of the autotransformer via the contacts of a temperature or current relay that control the actual load of the transformer ₁₃ [jJ.

Однако известное устройство не обеспечивает возможности прогнозирования допустимого расхода ресурса по предлагаемому графику загрузки транс- 20 форматора.However, the known device does not provide the ability to predict the allowable resource consumption according to the proposed load schedule of the trans-20 formatter.

Наиболее близким к предлагаемому по технической сущности является счетчик износа изоляции, содержащий источ2 ник питания, однофазный счетч'ик электрической энергии с потенциальной и токовой обмотками, усилитель тока [2). К недостаткам этого счетчика относят отсутствие возможности учитывания износа изоляции в зависимости от предполагаемого графика загрузки трансформатора и температуры окружающей среды.Closest to the proposed technical essence is an insulation wear counter containing a power source, a single-phase electric energy meter with potential and current windings, and a current amplifier [2). The disadvantages of this meter include the inability to take into account the wear of the insulation, depending on the proposed load schedule of the transformer and the ambient temperature.

Цель изобретения - расширение функциональных возможностей устройства путем обеспечения возможности учета износа изоляции в зависимости от предполагаемого графика загрузки трансформатора и температуры окружающей среды.The purpose of the invention is the expansion of the functionality of the device by making it possible to take into account the wear of the insulation, depending on the proposed load schedule of the transformer and the ambient temperature.

Поставленная цель достигается тем, что в устройство, содержащее источник питания, однофазный счетчик электрической энергии с потенциальной обмоткой и токовой обмоткой, которая подключена к выходу усилителя тока, введены блок набора предполагаемого графика загрузки трансформатора, комму3 татор, экспоненциальный преобразователь и задатчик температуры окружающей среды, причем выход источника питания через задатчик температуры окружающей среды подключен к потенци- ₅ альной обмотке однофазного счетчика электрической энергии, а выход блока набора предполагаемого графика загрузки трансформатора соединен через последовательно соединенные коммутатор ю и экспоненциальный преобразователь с входом усилителя тока.This goal is achieved by the fact that in the device containing a power source, a single-phase electric energy meter with a potential winding and a current winding that is connected to the output of the current amplifier, a set of the set transformer load schedule, a switch, an exponential converter and an ambient temperature adjuster are introduced, wherein the power source through the dial ambient medium output connected to potentsi- ₅ cial winding single-phase electricity meter, and the yield blo a set of the intended transformer load generated is connected through series-connected switch th and an exponential converter to the input of the current amplifier.

На чертеже представлена структурная схема предлагаемого устройства.The drawing shows a structural diagram of the proposed device.

Устройство содержит однофазный счетчик 1 электрической энергии, потенциальная обмотка которого через задатчик 2 температуры окружающей сре-» ды подключена к источнику 3 питания, блок 4 набора предполагаемого графика загрузки трансформатора, подсоединенный через коммутатор 5 и экспоненциальный преобразователь 6 к входу усилителя 7 тока, к выходу которого подключена токовая обмотка счетчика 1 электрической энергии.The device comprises a single-phase electric energy meter 1, the potential winding of which is connected to a power source 3 through an ambient temperature setter 2, a set 4 of a set transformer load schedule connected through a switch 5 and an exponential converter 6 to the input of the current amplifier 7, to the output which is connected to the current winding of the counter 1 of electrical energy.

Устройство работает следующим об разом.The device operates as follows.

Установкой потенциометрами, входящими в блок 4 набора, различных уров-* ней напряжения, пропорциональных соответствующим уровням загрузки, задается предполагаемый суточный график загрузки силового трансформатора. Коммутатор 5 обеспечивает поочередность подачи указанных напряжений на ³⁵ вход экспоненциального преобразователя 6, представляющего собой электрическую схему RC-цепочек, моделирующих тепловой процесс трансформатора во времени.By setting the potentiometers included in block 4 of the set of various voltage levels proportional to the corresponding load levels, the estimated daily load schedule of the power transformer is set. The switch 5 provides a sequence of supplying the indicated voltages to the ³⁵ input of the exponential converter 6, which is an electrical circuit of RC circuits simulating the thermal process of the transformer in time.

Сигнал с выхода экспоненциального преобразователя 6 усиливается усили телем 7 тока и подается на токовую обмотку однофазного электромеханического счетчика 1 электрической энергии?⁵Сигнал опорного напряжения от источника 3 питания, скорректированный потенциометром задатчика 2 температуры окружающей среды, поступает на потенциальную обмотку счетчика 1 электри- ⁵⁰ческой энергии.Is the signal from the output of the exponential converter 6 amplified by the current body 7 and fed to the current winding of a single-phase electromechanical counter 1 of electrical energy? ⁵ The voltage reference signal from the power supply 3, corrected by the potentiometer of the setpoint 2 of the ambient temperature, is fed to the potential winding of the meter ^{50 of} electric energy.

1000937 41000 937 4

В результате действия этих сигналов счетчик учитывает предполагаемый тепловой износ электрической изоляции трансформатора.As a result of these signals, the meter takes into account the estimated thermal wear of the electrical insulation of the transformer.

Предлагаемое устройство позволяет путем автоматического прогнозирования допустимости (по тепловому износу изоляции) перегрузки трансформатора уменьшить ущерб от перерывов электроснабжения, тем самым повысить надежность электроснабжения потребителей.The proposed device allows by automatically predicting the permissibility (thermal wear of the insulation) of the transformer overload to reduce damage from interruptions in power supply, thereby increasing the reliability of power supply to consumers.

Claims

(S) DEVICE FOR. PREDICTING THE CONSUMPTION OF THE INSULATION RESOURCE OF THE TRANSFORMER The invention relates to electrical measuring equipment and can be used to predict the consumption of the insulation resource of a power transformer taking into account the estimated load schedule and ambient temperature. A device for measuring the service life of a power transformer is known, which contains a single-phase electric energy meter, the current winding of which is connected to the terminals of the autotransformer through the contacts of a temperature or current relay controlling the actual load of the transformer 1. However, the known device does not provide the ability to predict the allowable consumption of the resource according to the proposed transformer loading schedule. The closest to the proposed technical entity is an insulation wear counter containing a power source, a single-phase electric energy meter with potential and current windings, a current amplifier 2. The disadvantages of this counter include the inability to take into account insulation wear from the estimated load schedule of the transformer and the ambient temperature. The purpose of the invention is to expand the functionality of the device by allowing for the inclusion of insulation deterioration depending on the intended load schedule of the transformer and the ambient temperature. The goal is achieved in that a device containing a power source, a single-phase electric energy meter with a potential winding and a current winding that is connected to the output of the current amplifier, is entered into a set of a set transformer loading schedule, a switch, an exponential converter and an ambient temperature setter the output of the power source through the setpoint temperature of the environment is connected to the potential winding of a single-phase electric energy meter and the output of the bl The set of the estimated load schedule of the transformer is connected via a serially connected switchboard and an exponential converter to the input of the current amplifier. The drawing shows a block diagram of the proposed device. The device contains a single-phase electric power meter 1, the potential winding of which through the ambient temperature sensor 2 is connected to the power source 3, the set 4 of the estimated transformer load schedule connected through the switch 5 and the exponential converter 6 to the input of the current amplifier 7, to the output of which current winding electric energy meter. The device works as follows. By setting the potentiometers included in block k of the set of different voltage levels proportional to the respective load levels, the expected daily load schedule of the power transformer is set. Switch 5 provides alternate supply of these voltages to the input of an exponential converter 6, which is an electrical circuit of RC circuits simulating the transformer thermal process over time. The signal from the output of the exponential converter 6 is amplified by the current amplifier 7 and is applied to the current winding of a single-phase electromechanical electric power meter 1. The reference voltage signal from the power supply 3, corrected by the ambient temperature setting unit potentiometer 2, is supplied to the potential winding of the electric power meter 1. As a result of these signals, the meter takes into account the expected thermal wear of the electrical insulation of the transformer. The proposed device allows, by automatically predicting the admissibility (due to thermal deterioration of insulation) of a transformer overload, to reduce damage from power supply interruptions, thereby increasing the reliability of power supply to consumers. An apparatus for predicting the consumption of a transformer isolation resource, comprising a power source, a single-phase electrical energy meter with a potential winding and a current winding that is connected to the output of the current amplifier, characterized in that, in order to enhance the functionality of the device by ensuring that the wear of the isolator is taken into account depending on the estimated load schedule of the transformer and the ambient temperature, a block of the set of the expected schedule transformer load, a switch, the exponential converter and ambient temperature setpoint, the output of the power source through the dial ambient temperature is connected to a potential counter-phase winding .elektricheskoy energy, and sets the output of unit intended transformer load generated is connected through the switch and serially connected. exponential converter with current amplifier input. Sources of information taken into account in the examination 1. USSR author's certificate number 667907, cl. G 01 R 21/06,.

2. USSR author's certificate number 655976, cl. G 01 R 11/32, 197 (prototype).