Basic tripping circuit in Electrical power station
When any section of power system or equipment needs to be protected, a primary of current transformer is connected in series with that.
While secondary of current transformer (CT) is connected to current coil of the relay. If the relay is two quantity relay, secondary of potential transformer (PT) is also connected to potential coil of the relay.
When fault occurs, a current flowing through that section of power system or equipment increases to a very high value. Fault current also flows through the CT primary and accordingly increases the CT secondary current that further increases relay coil current.
Thus relay contacts get closed under the influence of such high fault current. Consequently trip circuit of circuit breaker get closed and current starts flowing from battery through trip coil. Once trip coil of circuit breaker is energized, it activates the circuit breaker opening mechanism and open the breaker contacts.
This is how faulty section of power system or equipment gets isolated from healthy one. Another important device in trip circuit is an auxiliary switch (52-a) which is mechanically coupled with operating mechanism of circuit breaker.
It is ON when the circuit breaker is ON and OFF when the circuit breaker is OFF. As auxiliary switch is in trip circuit hence when it opens, it breaks the current in trip circuit. Once the current in trip circuit interrupts, the relay contacts comes to normal position.
The purpose of auxiliary switch is that breaking of trip circuit takes place at auxiliary switch contacts and hence possible arcing due to current interruption across relay contacts is eliminated.
Also a circuit breaker tripping takes a time ranging from 1 to 5 cycles. A trip coil is not designed for energizing it continuously once the breaker trips.
It is possible that auxiliary relay contact gets locked due to some internal mechanism failure, hence a continuous current flows through the trip coil if auxiliary switch (52-a) is not provided in the trip circuit.
Many other functions such as annunciations, alarms, interlocks, are simultaneously performed through multi contact auxiliary switch when the relay operates. Auxiliary switch is generally placed in control cabinet of circuit breaker.
We are a group oof volunteers and starting a new scheme in oour community.
Your website provided us with valuable information tto
work on. You’ve done a formidble job annd our entire communityy will be thankful to you. https://evolution.org.ua/
We are a group of volunteers and starting a new scheme in our
community. Your website provided us with valuable informationn to work on. You’ve done a formidable job and our entir community wil bbe thankful to you. https://evolution.org.ua/
Pingback: 11kV/400V Pole mounted sub-station
Happy to explore discussions, exchange ideas, and pick up new insights throughout the journey.
I’m interested in understanding different opinions and sharing my input when it’s helpful. Interested in hearing new ideas and building connections.
There’s my website-https://automisto24.com.ua/
hi,
thanks for appreciation. Now, my focus on spread my website content to more readers.
To boost my moral, Please share my website to your friends and subscribe my Insta/Telegram/Whatsapp group.
доставка цветов недорого заказ цветов с доставкой
доставка цветов заказ цветов с доставкой
Read the latest sports news: football, hockey, basketball, MMA, tennis and more. Insiders, forecasts, reports from the scene. Everything that is important for sports fans to know – in one place.
Микрозаймы онлайн https://kskredit.ru на карту — быстрое оформление, без справок и поручителей. Получите деньги за 5 минут, круглосуточно и без отказа. Доступны займы с любой кредитной историей.
Хочешь больше денег https://mfokapital.ru Изучай инвестиции, учись зарабатывать, управляй финансами, торгуй на Форекс и используй магию денег. Рабочие схемы, ритуалы, лайфхаки и инструкции — путь к финансовой независимости начинается здесь!
Быстрые микрозаймы https://clover-finance.ru без отказа — деньги онлайн за 5 минут. Минимум документов, максимум удобства. Получите займ с любой кредитной историей.
Сделай сам ремонт квартиры своими руками Ремонт квартиры и дома своими руками: стены, пол, потолок, сантехника, электрика и отделка. Всё, что нужно — в одном месте: от выбора материалов до финального штриха. Экономьте с умом!
КПК «Доверие» https://bankingsmp.ru надежный кредитно-потребительский кооператив. Выгодные сбережения и доступные займы для пайщиков. Прозрачные условия, высокая доходность, финансовая стабильность и юридическая безопасность.
Ваш финансовый гид https://kreditandbanks.ru — подбираем лучшие предложения по кредитам, займам и банковским продуктам. Рейтинг МФО, советы по улучшению КИ, юридическая информация и онлайн-сервисы.
Займы под залог https://srochnyye-zaymy.ru недвижимости — быстрые деньги на любые цели. Оформление от 1 дня, без справок и поручителей. Одобрение до 90%, выгодные условия, честные проценты. Квартира или дом остаются в вашей собственности.