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Fixed vacuum circuit breakers are installed at fixed places and are hard to remove from their positions; they are available in the following types.
This is a three-phase circuit breaker with a rated voltage of 20 kV. It has three pole units that operate their contacts independently in a vacuum. The contacts are designed in a way that when the upper main power line contacts close the circuit, the power line ground operation will open automatically. The circuit breaker also has a manual opening button available to allow the opening of the breaker when needed. Current transformation for this model is done by using external helical source transformers.
This type of vacuum circuit breaker operates the contacts with one pressure and closes them with one pressure. The circuit breaker has a two-step mechanism that performs electrical interlocking. When the upper contacts close, a spring is released from the tension, causing the lower contacts to close. This allows the breaker to close service without needing external interference. On the other hand, during malfunction or when the main power line is closed, the lower contacts will separate, thus improving the safety of the equipment.
Unlike the single-pressure type vacuum circuit breaker, this circuit breaker needs two pressure to operate its contact either to make it close or to open it. The operation of this circuit breaker is quick and smooth. Besides this, the isolation path of these circuit breakers is well defined, meaning there is little risk of flashing over. This type of circuit breaker is mainly used in systems where the maximum interrupt capability is required and over 38 kVA voltage.
This kind of two pressure type circuit breaker has high reliability and good electric and thermal stability. In this, the working vacuum is separated by a double piston, which is an expansion coefficient of the piston and an electro-oscillator. This will increase the extinction force and make the breaker more reliable under all circumstances. The isolation switch is bridge connected to maintain a safe distance even when the vacuum interrupters are not in operation.
Many fixed type vacuum circuit breakers have operating temperatures that range from -40 c to +60 c degrees, which make the breaker withstand extreme temperatures. In addition, they feature IP65 sealing, which protects them from dust ingress as well as high-pressure water jets. The breakers are tested under IK class standards, meaning they can also withstand extremely high impacts.
Low maintenance is one of the important features that makes these vacuum circuit breakers durable. They don't need any frequent checks, which is a function of the absence of any arcing in the mechanism. Other than that, these breakers are made of corrosion-resistant materials like stainless steel, which extends their lifetime and reduces maintenance costs.
Fixed type vacuum circuit breakers have insulating materials with high performance, which helps to maintain a safe distance even in high volatile environments and improve the durability by preventing any dielectric breakdown.
Fixed type of vacuum circuit breakers are designed to have a high tolerance to vibrations and shocks during transportation and installation that can significantly reduce the chances of mechanical failure. In case of earthquakes, the circuit breakers also meet the seismic category standards and include mounting brackets that will not detach even in extreme conditions.
The bodies of fixed vacuum circuit breakers are made of metal like steel, which are very robust construction and can easily withstand environmental factors like moisture, humidity, or dust that might cause deterioration in other types of circuit breakers.
Once the electrical equipment runs over its intended load, fixed type vacuum circuit breakers interrupt its power supply; in addition, they also protect the electrical equipment by automatically disconnecting the circuit in case of excess current. That way, these circuit breakers play an important role in safeguarding modern appliances from electrical damage.
Businesses rely on efficient power distribution to operate their daily activities. With fixed vacuum circuit breakers in place, companies can manage several electrical systems and motors running continuously without interruption. These breakers cater to large power requirements, ensuring effective and uninterrupted usage of electric power in industries like manufacturing, commercial buildings, and data centres.
A few decades ago, power control wasn't as efficient as today. However, with the help of fixed vacuum circuit breakers in modern electrical systems, it is now easy to control and distribute electrical power. These breakers assist in managing electrical loads in industrial businesses where there are huge machinery and power-consuming equipment. They regulate and balance power, avoiding possible overloads and ensuring efficient operation. They also allow users to control the electrical distribution systems, thus enhancing operational flexibility.
These circuit breakers can be isolated at the right time to stop operations, thus preventing danger levels. It ensures that businesses work safely while reducing the chances of an electrical fire or a power surge. For this reason, fixed vacuum circuit breakers are essential and common in places like hospitals and commercial buildings, where most electronic devices are sensitive.
Fixed type vacuum circuit breakers provide electrical insulation for medium voltage, so they are used widely in industries like oil and gas, construction companies, mining, and power generation. They are important for protecting people and equipment, especially where the environment is hazardous and increases the risk of electrical failure because they are reliable and durable.
The circuit breaker has to be selected with a power rating of interruption that matches the current levels in the electrical system. For this, the rated current capacity of the equipment and load has to be considered. Choosing one with a greater power rating will not only help in future load growth but also enhance system safety if there are transient surges. Avoid going for a breaker with a lower rating because it will frequently trip during overload, ending up causing operational downtime and risk exposure.
The vacuum circuit breaker is designed to withstand specific environmental conditions and give their best performance, whether in extreme heat, humidity, or dust. One should select one with the correct IP rating that positively impacts the environment. For example, one with a higher IP rating should be selected if the environment is full of dust or moisture. In situations where the temperature goes to extremes, look for a breaker with temperature compensation features to maintain optimum performance.
Fixed type vacuum circuit breakers use various operating mechanisms to close and open the breaker: These mechanisms can either be spring-driven, hydraulic, or motor-operated. Each of these has its own advantages and disadvantages. For instance, motor-operated mechanisms are more suitable for automated systems, while spring-driven mechanisms are more reliable and easier to maintain. Whichever one the buyer settles for has to be compatible with the existing automation and control systems in that place.
Certifications and standards are important considerations for fixed vacuum circuit breakers because they ensure that the equipment has met safety and performance requirements. For example, in the U.S., breakers should meet ANSI/IEEE standards to be acceptable, while in Europe, they should meet the requirements of IEC. Those built according to these standards are likely to have superior performance and greater reliability than those that did not. These certifications also ensure a longer lifespan and lower maintenance costs. For these reasons, one should always look for industry standards and certifications.
These specifications include voltage ratings, insulation types, and other crucial technical features. One should ensure that the specifications' voltage ratings are compatible with those of the electrical systems. In other words, the vacuum circuit breaker must be rated for the voltage level required for the application. In addition, the technology of insulation used should correspond to the kind of environment the breaker will be operating in. Pay special attention to the materials used in construction, as they determine the maintenance needed and the overall lifespan of the circuit breaker.
A1.Fixes type vacuum circuit breakers interrupt electrical flow, safeguarding electrical equipment and wiring from overload, a short circuit, and a power surge. They help increase operational efficiency by ensuring constant power distribution across different electrical systems.
A2.The following factors should be considered when buying fixed type vacuum circuit breakers: Environmental conditions, interruption ratings, technical specifications, operating mechanisms, and standards and certifications. Give each of them consideration regarding the existing electrical systems and their surrounding environments to determine which is most suitable.
A3.The fixed type vacuum circuit breakers with IP ratings of 65 can withstand environmental contaminants like dust and moisture. This contributes significantly to the circuit breaker's reliability and durability in harsh industrial environments.
A4.The rating of interruption power indicates the maximum power surge or current that a circuit breaker can interrupt. Lighting, appliance, or electric motor overloading or drawing excess current is prevented by selecting one with a rating that matches the electrical system's load.
A5.A two-pressure type vacuum circuit breaker has two pressure types for contact closure and separation. It is known for its reliability and stability in various conditions and is mainly used in systems with high voltage. In other words, this type needs two pressure to function.
