Why do autotransformers use fluorescent optical fibers for temperature measurement-INNO

What is a rail transit autotransformer

The AT power supply (autotransformer power supply) method has become the main direction of high-speed and heavy-duty railway construction. The AT power supply method adds positive feeder lines and parallel autotransformers in the traction network, doubling the system power supply voltage. Under the same traction load, the current of the contact network and positive feeder lines can be reduced by half. В то же время, the impedance of the traction network in the AT power supply method is about 1/4 of that in the BT power supply (suction transformer power supply) метод, which improves the traction network’s energy transmission capacity and reduces the voltage and energy losses of the traction network. It effectively extends the power supply distance of the traction substation, уменьшает магнитное поле, создаваемое тяговым током в пути, и ослабляет помехи, создаваемые магнитным полем на соседних линиях связи.

Зачем автотрансформатору измерять температуру

В системах передачи и преобразования электроэнергии, силовое оборудование, такое как токоведущие шины и шины, может испытывать чрезмерное повышение температуры, когда ток нагрузки слишком велик или поверхность окислена.. Длительное бездействие может ухудшить работу соседних частей, находящихся под напряжением., приводящие к поломке, неисправность и отключение электроэнергии. По данным анализа, предоставленного отделом надзора за производственной безопасностью, над 90% крупных аварий на электростанциях и трансформаторных станциях по стране происходят из-за перегрева, нанося огромные экономические потери производству и эксплуатации, and also threatening the safety of life and property. By monitoring the operating conditions of bus contacts, Муфты высоковольтных кабелей, and high-voltage switch contacts, it is possible to effectively prevent the occurrence of high-voltage transmission and substation faults, providing effective guarantees for achieving safe production. Следовательно, taking effective measures to monitor the temperature changes of joints in transmission and transformation systems in high-voltage environments is a major issue that urgently needs to be addressed.

As an important component in the power system of rail transit, the safe and reliable operation of autotransformers is closely related to the safety of the power grid and transportation equipment. The fire accident caused by internal faults in transformers is a major hidden danger, so it is particularly important to detect and monitor the temperature of transformers.

The drawbacks of traditional temperature measurement methods

Many busbars are at high potentials (6КВ, 10КВ, 35КВ, 110КВ, 220КВ, and even higher). Настоящее время, there are many equipment specifically used for measuring high voltage busbars, high voltage switches, and electrical contact heating in China, but there are few measurements of the temperature of busbars in narrow fully enclosed spaces.

Wax stick temperature measurement

One commonly used method for temperature monitoring is to apply a layer of luminescent material with a color that changes with temperature on the high-voltage electrical contact surface, and roughly determine the temperature range by observing its color change. This method has low accuracy and poor reliability, and cannot be quantitatively measured. It is also impossible to observe in a fully enclosed environment;

Infrared thermal imager temperature measurement

Another method is to use infrared thermal imagers with radiation characteristics, which have high accuracy. Однако, due to the need for optical components, it is not very convenient to use in specific situations. Even if it is reluctantly used, it poses challenges for installation, отладка, содержание, and equipment power supply, making it difficult to implement and expensive, making it difficult to promote and apply. Что еще более важно, both of the above methods require manual inspection and cannot obtain real-time temperature data. The obtained data is always lagging and cannot function as a real-time temperature alarm.

Беспроводное измерение температуры

Сейчас, some Wireless temperature measurement systems are being put into use, and the stability of the temperature measurement terminals is not sufficient during operation. В дополнение, most of these products are powered by built-in batteries, and the lifespan of the built-in batteries and the constraints on the appearance and size of the batteries have a greater or lesser impact on the products. В то же время, in environments that are difficult for personnel to reach, maintenance or battery replacement will become impossible.

Fluorescent fiber optic temperature measurement using autotransformer

Basic functions of transformer Оптоволоконное измерение температуры хозяин

▲ Data export

Запись событий

▲ Multi level alarm settings

▲ Temperature trend analysis

▲ Historical data callback

▲ Real time data recording

▲ Output: 4-20MA

Multi channel temperature measurement:

Выход: РС485

Standard MODBUS protocol;