Vacuum switch 35 kV

A vacuum circuit breaker is an electromechanical device that is used to switch electrical circuits at high voltage. The medium for extinguishing the arc is vacuum. Designed for use at substations as part of switchgear cells 6(10)–35 kV. The device of the vacuum switch includes two contact elements - fixed and movable, located in the vacuum chamber. The vacuum chamber is located inside the compound pole. Switching off occurs due to the movement of the movable contact in the opposite direction from the fixed contact.

Technical parameters of vacuum circuit breakers

Fixed and withdrawable version of the circuit breaker;

Rated currents: 630 A-1250 A-1600 A-2000 A-2500 A;

Rated breaking currents: 25 kA-31.5 kA;

Mechanical resource: 10000 operations;

Interfacial distances 145-150-185-210-240-275 mm;

New roll-out trolley with the possibility of motorized circuit breaker roll-in and roll-out.

Optional equipment:

Locking the circuit breaker in the open state with a padlock or built-in lock.

Blocking of on/off buttons.

Second trip coil, instantaneous undervoltage coil.

Additional block contacts.

64-pin low voltage connector.

Additional components for building a cell.

Circuit breaker external trip mechanism that automatically trips the circuit breaker when rolled out.

The principle of operation of the vacuum circuit breaker

It is based on the use of a vacuum chamber to ensure the switching of an electrical circuit. The circuit breaker operates on two principles: opening and closing contacts under high vacuum conditions and holding contacts in the closed position. In the event of an overload or short circuit in the electrical circuit, the relay protection and automation device sends a signal to the control circuit of the circuit breaker drive to open the circuit breaker. The drive transfers the mechanical force to the rod, which is rigidly fixed with a moving contact and thereby opens the circuit. At the same time, a vacuum is created inside the circuit breaker, which reduces contact wear and improves operational reliability. This state is established by a device called a closed vacuum chamber, which contains contacts. When a command is issued to turn off the circuit, the chamber begins to fill with air, and when the set pressure is reached, the contacts bifurcate, breaking the electrical circuit. After the end of the power outage cycle, the chamber again begins to inflate to a vacuum state, after which the contacts return to their original position.

The use of vacuum circuit breakers for high voltage eliminates the need to maintain a surface gap between contacts, as is required when working with gas circuit breakers.

Vacuum circuit breakers are classified according to the voltage class: for devices for 6–10 kV, for 35 kV. These switches have three poles, each contains a chamber and a contact preload unit (thrust), a spring drive.

By location, the switches are divided into:

Outdoor switches - used on open switchgear.

Switches for indoor installation - are used as part of complete switchgears. It is these vacuum circuit breakers that are installed in their switchgear cells.

Also, vacuum circuit breakers are classified according to their design: fixed and withdrawable.

Fixed circuit breakers are used as independent devices and as components of larger automatic equipment protection systems.

One of the advantages of stationary vacuum circuit breakers is an increased insulating capacity and the ability to operate at very high temperatures (from -40 °C to + 40 °C, the lowest temperature limit is -60 °C).

Fixed circuit breakers are rigid and designed for permanent use in fixed locations, such as special racks or cabinets. This allows them to provide a higher level of reliability and a long service life - more than 30 years.

Withdrawable devices are used in work with complete switchgears. When working with withdrawable circuit breakers, it can be replaced without shutting down the entire switchgear.

Vacuum circuit breakers operate in strong electromagnetic fields: closing solenoid 70-115 (AC) / 85-105 (DC), opening solenoid 65-120 (AC) / 70-110 (DC).

Vacuum circuit breakers are used in a variety of applications: switching electric motors, heating, ventilation and air conditioning systems, as well as other processes where high power switching is required.

There are also vacuum switches. They are used in power systems such as hydroelectric power plants, nuclear power plants and other power industry facilities.

The vacuum switch-disconnector consists of contacts located in a vacuum chamber, which is filled with high vacuum gas. When the switch is turned on, the contacts connect, allowing electrical current to flow through the circuit. When the load break switch is opened, the contacts are disconnected, ensuring the safety and protection of the electrical system.

What are vacuum circuit breakers for?

The main application of vacuum circuit breakers is the switching of currents in electrical systems. They can shut down the power system quickly and reliably with possible damage. Thanks to this function, accidents can be prevented.

Vacuum load break switches are used to protect electrical equipment from overloads and short circuits. They are used in energy systems such as hydroelectric power plants, nuclear power plants, wind turbines and other power industry facilities.

Vacuum circuit breakers are used in the following areas:

-Industry: Used to control motors in industrial installations, such as compressors, fans, pumps and other industrial machines.

-Electric power industry: are widely used in the electric power industry for disconnecting and controlling electrical circuits, including for transmission, distribution and transmission of electricity.

- Transport: used in electrical circuit control systems in railway electric trains and trams.

- Fusion: used in tokamaks to manipulate magnetic fields and plasma states.

- Medical: Widely applied in medical devices and equipment, such as magnetic resonance imaging and laser surgical systems.

Advantages of vacuum circuit breakers:

  - No gas gap and arc fault phenomenon. Circuit breakers protect equipment from damage caused by arcing. The service life and reliability of such devices is much higher than that of circuit breakers using a different medium to extinguish the arc.

  - High degree of reliability. Vacuum breakers are more reliable and safer than other types of breakers such as oil or air breakers, as the vacuum environment eliminates the possibility of fire or explosion.

  - High performance. Due to the use of a vacuum medium in which an electric current flows, vacuum circuit breakers provide a higher switching speed than other types of circuit breakers.

  - Devices are not subject to oxidation and corrosion, and are also resistant to external influences.

  - Low operating costs. The circuit breakers do not require regular maintenance, so the cost of their operation is significantly reduced.

  - The compact sizes allow to install them on the small areas.

  - Low noise and vibration levels compared to oil circuit breakers.

The devices are energy-saving and do not pollute the environment. Work without noise and vibrations. High switching speed. Able to quickly de-energize electrical circuits in case of overload or short circuit, which helps prevent possible accidents and damage to electrical equipment. A wide range of modifications that differ in design, functional characteristics and purpose.

The price of vacuum circuit breakers depends on the technical parameters, additional functions, quantity and region of delivery. To order vacuum circuit breakers, leave a request on the website.

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The terms of delivery of the order depend on the availability of goods in the warehouse. If at the time of placing the order, all the selected goods are available, then we will deliver the order within a few days, depending on the remoteness of your region. If the ordered product is not in stock, the maximum delivery time of the order may be several weeks. But we try to deliver orders to customers as quickly as possible, and 90% of customer orders are shipped within the first almost immediately. In the event that part of the goods from your order did not arrive at the warehouse after the specified period during the discussion with the manager, we will definitely inform you about it.

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