SU788038A1

SU788038A1 - Insulation resistance measuring device

Info

Publication number: SU788038A1
Application number: SU731900629A
Authority: SU
Inventors: Эдуард Соломонович Шурин; Владимир Петрович Колосюк; Анатолий Алексеевич Позняков; Владимир Иванович Мехов
Original assignee: Завод Электроизмерительных Приборов "Мегомметр"
Priority date: 1973-04-03
Filing date: 1973-04-03
Publication date: 1980-12-15

Description

Изобретение относится к электротехнике, в частности к технике изме рений, и может быть использовано при изготовлении приборов для измерения сопротивления изоляции.The invention relates to electrical engineering, in particular to a measurement technique, and can be used in the manufacture of instruments for measuring insulation resistance.

Известно устройство для измерения сопротивления изоляции, включающее трансформатор тока с разъемным сердечником и соединенные последовательно с ним выпрямитель, усилитель и микроамперметр [1].A device for measuring insulation resistance, including a current transformer with a detachable core and connected in series with a rectifier, amplifier and microammeter [1].

Однако известное устройство непригодно для производства измерений в цепях постоянного тока, в частности в контактных сетях.However, the known device is unsuitable for measurements in DC circuits, in particular in contact networks.

Известно также устройство для измерения сопротивления в контактной сети/ включающее источник напряжения, подключенный через заградитель-эд ный фильтр к зажимам, а также лагометр, одна из рамок которого через выпрямитель подсоединена к тем же зажимам [2],Also known is a device for measuring resistance in a contact network / including a voltage source connected through a trap-ed filter to the terminals, as well as a lagometer, one of the frames of which is connected through the rectifier to the same terminals [2],

Известное устройство не пригодно, для контроля отдельных элементов контактной сети без их отсоединения.The known device is not suitable for monitoring individual elements of the contact network without disconnecting them.

Цель изобретения - упрощение процесса измерения при определении сопротивления изоляции отдельных уч’астков контактной сети без их отключения.The purpose of the invention is to simplify the measurement process when determining the insulation resistance of individual sections of the contact network without turning them off.

Поставленная цель достигается тем, что устройство, содержащее ис5 точник напряжения, подсоединенный через заградительный фильтр.к измерительным зажимам, и лагометр, одна из рамок которого через заградительный фильтр и выпрямитель подсоединена 10 к тем же зажимам, дополнительно содержит второй выпрямитель, усилитель и трансформатор тока с разъемным сердечником, соединенные последовательно, причем вторая рамка 15 лагометра через второй выпрямитель и усилитель подсоединена к выходным зажимам трансформатора тока.This goal is achieved by the fact that a device containing a voltage source connected through a blocking filter to measuring terminals, and a lagometer, one of the frames of which through a blocking filter and rectifier is connected 10 to the same terminals, additionally contains a second rectifier, amplifier and current transformer with a detachable core, connected in series, with the second lagometer frame 15 through a second rectifier and amplifier connected to the output terminals of the current transformer.

Для возможности контроля участков сети, не имеющих непосредственной гальванической связи с токонесущим проводом сети, устройство дополнительно снабжено переключателем и проводом, подсоединяемым к источнику напряжения через упомянутый переклю25 чатель, причем сердечник трансформатора установлен на этом проводе.In order to be able to control sections of the network that do not have direct galvanic connection with the current-carrying wire of the network, the device is additionally equipped with a switch and a wire connected to the voltage source through the aforementioned switch25, the transformer core being mounted on this wire.

На чертеже схематически изображено предлагаемое устройство.The drawing schematically shows the proposed device.

Устройство содержит источник 1 3Q переменного напряжения, заградитель3 ный фильтр 2, контактный провод сети· 3, заградительный фильтр 4, выпрямитель 5, первую рамку 6 логометра , корпус троллеедержателя 7, переключатель 8, пряжковый изолятор 9, трансформатор_10 с разъемным сердечником, усилитель 11, выпрямитель 12, $ вторую рамку 13 логометра.The device contains an AC voltage source 1 3Q, a blocking filter 3, a contact wire of the network · 3, a blocking filter 4, a rectifier 5, a first logometer frame 6, a trolley holder 7, a switch 8, a buckle insulator 9, a transformer_10 with a split core, an amplifier 11, rectifier 12, $ second frame 13 of the logometer.

Устройство работает следующим образом.The device operates as follows.

Измерительный ток вырабатываемый генератором 1 через фильтр 2 попадает to в сеть 3 и далее через контролируемый 'траллеедержатель 7 на землю, а через заградительный фильтр 4 и выпрямитель 5 на первую рамку 6 логометра.The measuring current generated by the generator 1 through the filter 2 goes to network 3 and then through the controlled trawl holder 7 to the ground, and through the barrage filter 4 and rectifier 5 to the first frame 6 of the logometer.

Ток, ответвляющийся в измерительный участок, возбуждает напряжение в обмотке трансформатора тока, благодаря чему во второй рамке 13 логометра через усилитель 11 и второй выпрямитель 12 протекает ток, про- ' эд порциональный току утечки. Таким образом, в рамках логометра протекают токи, пропорциональные один - току утечки, второй - напряжению на измеряемом участке, в силу чего логометр показывает величину, пропорциональную 25 сопротивлению изоляции измеряемого участка.The current branching into the measuring section excites the voltage in the winding of the current transformer, due to which a current flows through the amplifier 11 and the second rectifier 12, which is proportional to the leakage current. Thus, within the logometer, currents flow proportional to one to the leakage current, and the second to the voltage in the measured section, whereby the logometer shows a value proportional to 25 the insulation resistance of the measured section.

В том случае, когда необходимо измерить ток утечки пряжкового изолятора 9, источник 1 напряжения через 30 переключатель 8 и дополнительный провод, подсоединяется к корпусу троллеедержателя 7, при этом сердечник трансформатора 10 устанавливается на растяжке с контролируемым пряжковым35 изолятором, в этом случае ток в первой рамке логометра пропорционален току утечки только через пряжковый изолятор.In the case when it is necessary to measure the leakage current of the buckle insulator 9, the voltage source 1 through 30 switch 8 and an additional wire is connected to the housing of the trolley holder 7, while the core of the transformer 10 is installed on a stretch with a controlled buckle insulator35, in this case, the current in the first frame The logometer is proportional to the leakage current only through the buckle insulator.

Устройство позволяет производить измерение и контроль изоляции контактной сети на отдельных ее участках как без, так и под напряжением.The device allows you to measure and control the insulation of the contact network in its individual sections, both without and under voltage.

Claims

The invention relates to electrical engineering, in particular, to the technique of measurement, and can be used in the manufacture of devices for measuring insulation resistance. A device for measuring insulation resistance is known, which is a current transformer with a split core and a rectifier, amplifier and microammeter (1) connected to it in series (1. However, the known device is unsuitable for making measurements in DC circuits It is also known a device for measuring resistance in a contact network that includes a source of power, connected through a shield to EY filter to the terminals, as well as a lagometer, one of the frames of which is connected The same device is not suitable for monitoring individual elements of the contact network without disconnecting them. The purpose of the invention is to simplify the measurement process when determining the insulation resistance of individual sections of the contact network without disconnecting them. voltage, connected through a filter filter. to measuring terminals, and a lagometer, one of the frames of which is connected to the same terminals through a barrier filter and a rectifier, in addition It contains a second rectifier, an amplifier and a current transformer with a split core, connected in series, the second lagometer frame being connected via a second rectifier and amplifier to the output terminals of the current transformer. In order to control the network sections that do not have direct galvanic communication with the current-carrying wire of the network, the device is additionally equipped with a switch and a wire connected to the voltage source through the switch, and the transformer core is installed on this wire. The drawing schematically shows the proposed device. The device contains a source of alternating voltage 1, a barrier filter 2, a contact wire of the network 3, a barrier filter 4, a rectifier 5, a first frame of the gauge, a trolley holder body 7, a switch 8, a isolator 9, a transformer J. O with detachable core, amplifier 11, rectifier 12, second frame 13 of the gauge. The device works as follows. The Hbffi meter current generated by the generator 1 through the filter 2 gets into the network 3 and then through the controlled trap holder 7 to the ground, and through the barrier filter 4 and the rectifier 5 to the first frame 6 of the gauge. The current branching to the measuring section excites the voltage in the current transformer winding, so that in the second frame 13 of the gauge through the amplifier 11 and the second rectifier 12 a current is proportional to the leakage current. Thus, in the framework of the gauge, currents are proportional to one - leakage current, the second - to the voltage on the measured section, whereby the logometer shows a value proportional to the insulation resistance of the measured section. In the case when it is necessary to measure the leakage current of the insulator pins 9, the voltage source 1 through the switch 8 and the additional wire, is connected to the body of the trolley holder 7, while the core of the transformer 10 is installed on a stretch with a monitored insulated belt, in this case, the current in the first frame of the gauge is proportional to the leakage current only through a buck insulator. The device allows measurement and control of the insulation of the contact network in its individual sections, both without and under voltage. Claim 1, An insulation resistance measuring device comprising an alternating voltage source connected via a priming filter and a rectifier to the first frame of the gauge, as well as through a filter to clamps serving to be connected to the circuit to be measured, characterized in that in order to simplify the measurement process in determining the insulation resistance of sections of a contact network under voltage, it additionally contains a second rectifier, amplifier and current transformer with a detachable core, connecting nennye sequentially, wherein the second frame ratiometer through the second rectifier and an amplifier connected to the output terminals of the current transformer. 2. The device according to claim 1, wherein it further comprises a wire with a switch, wherein the switch is connected to the measuring terminals, the wire is connected to the switch, and the core of the current transformer is installed on the wire. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 161411, cl. G 01 R 27/00, 1961.

2. USSR author's certificate as per 1899239 / 24-07.