Wiktor Wise
Electrical reactors, also known as line reactors or chokes, are coils used in power systems to control electricity. They are placed in the main parts of the electrical network, like near transformers or substations. Reactors have a wide range of applications, from filtering out unwanted signals to facilitating communication and limiting fault currents. They are classified by their application mode, construction, and operation, and play a crucial role in ensuring the safety and stability of power systems.
| Characteristics | Values |
|---|---|
| Definition | An electrical reactor, also known as a line reactor or choke, is a coil that creates a magnetic field to limit current rise. |
| Function | To reduce harmonics and protect electrical drives from power surges, transients, spikes, and fluctuations. |
| Types | Shunt, series, damping, tuning, earthing transformers, arc suppression, smoothing, fixed, outdoor type, dry-type, oil-immersed, AC line, DC link, bus, switchyard, and nuclear. |
| Applications | Power systems, electrical drives, variable frequency drives (VFDs), DC power networks, AC circuits, and nuclear power generation. |
| Construction | Coils of insulated wire wrapped around a steel or magnetic core. |
| Classification | Application mode, construction, and operation. |
| Safety | Turn off power before maintenance. Wear safety gear. Check for heat, noise, shaking, and damage. Ensure proper cooling and maintenance. |
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What You'll Learn
Types of electrical reactors
Electrical reactors, also known as line reactors or chokes, are coils that create a magnetic field to limit current rise, reduce harmonics, and protect electrical drives from power surges. They are commonly used in power systems to control electricity, manage voltage, reduce short-circuit currents, and improve power quality. Reactors are typically classified by their application mode, construction, and operation. Here are some of the main types of electrical reactors:
Shunt Reactors
Shunt reactors are connected in parallel within a system. Their primary purpose is to compensate for the capacitive current component by absorbing reactive power (VAR) generated by the system's capacitive effect. They are often used in substations and work alongside surge protectors to protect equipment and ensure voltage stability.
Series Reactors
Series reactors are connected in series within the system and are used to limit fault currents. They help manage load distribution in power grids and reduce sudden changes in current, especially during short circuits. Series reactors are commonly used in distribution networks, capacitor banks, and motors.
Current-Limiting Reactors
Current-limiting reactors are a subtype of series reactors specifically designed to limit the current during a fault. They are placed in line with the electrical path, helping to control and manage the power flow.
Filter Reactors
Filter reactors, also known as tuning reactors, are used with capacitors to form filter circuits. They help mitigate harmonic distortions in the system and facilitate Power Line Carrier Communication.
Line Reactors
Line reactors are electromagnetic devices that consist of a steel core wrapped with copper coils. They are used to protect electrical devices, reduce harmonics, and limit voltage spikes and surges. There are two main types of line reactors: AC line reactors, installed between the power system and the VFD, and DC link reactors, inserted into the DC link of a drive.
Load Reactors
Load reactors are installed at the output of a motor drive. They help eliminate voltage spikes and reflected wave noise by reducing the rate of change in the drive output voltage. However, load reactors tend to overheat due to the harmonic content of the output waveform.
These are some of the main types of electrical reactors used in power systems. Each type has specific functions and applications, contributing to the overall stability, efficiency, and protection of electrical systems.
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How electrical reactors work
Electrical reactors, also known as line reactors or chokes, are coils that create a magnetic field to limit current rise, reducing harmonics and protecting electrical drives from power surges. They are passive electrical components used in power systems and other fields.
Reactors are classified by their application mode, construction, and operation. They are used to filter out harmonics present in DC power and play a crucial role in power systems, from filtering harmonics to facilitating communication and limiting fault currents. Reactors are also used to increase the impedance and limit the inrush current, which is the current drawn by devices during startup, which can cause voltage sags that trip out other equipment.
The two most common types of reactors are dry-type and oil-immersed. Dry-type reactors are open and rely on air circulation to dissipate heat, while oil-immersed reactors are placed in tanks and require a magnetic shield to prevent eddy currents.
Line reactors are used when low line impedance allows high inrush current, when power factor correction capacitors are used, or when a motor drive causes notching. They are often used with variable-frequency drives (VFDs) to protect them from input power disruptions. When installed between the power system and the VFD, it is known as an AC line reactor. When inserted into the DC link of a drive, it is called a DC link reactor. Both types act as harmonic current limiters, but AC reactors protect more equipment as they are installed between the VFD and power source, limiting exposure to power surges and fluctuations.
Current-limiting reactors, also known as current-limiting reactance coils, are used to reduce short-circuit currents that result from plant expansions and power source additions. They can also be used in high-voltage electric power transmission grids and to restrict the starting current of electric motors or as part of a speed control system.
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Applications of electrical reactors
An electrical reactor, also known as a line reactor or choke, is a coil that creates a magnetic field to limit current rise, reducing harmonics and protecting electrical drives from power surges.
Shunt Reactor
A shunt reactor is connected in parallel within a system. It compensates for the capacitive current component by absorbing the reactive power (VAR) generated by the system’s capacitive effect. Shunt reactors help maintain stability by balancing the capacitive current in power systems.
Series Reactor
A series reactor is connected in series within the system. It limits fault currents and aids in load sharing in parallel networks, enhancing system protection and efficiency. When connected to an alternator, it is called a generator line reactor, which reduces stress during three-phase short circuit faults.
Smoothing Reactor
A smoothing reactor is used in a DC power network to filter out harmonics.
Load Reactor
Load reactors are installed at the output of a motor drive. They help eliminate voltage spikes or reflected wave noise by slowing down the rate of change in the drive output voltage.
Line Reactor
Line reactors are used when low line impedance allows high inrush current, when power factor correction capacitors are used, or when a motor drive causes notching. They are also used to protect equipment from input power disruptions that damage the drive.
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Electrical reactor safety
An electrical reactor, also known as a line reactor or choke, is a coil that creates a magnetic field to limit current rise, reducing harmonics and protecting electrical drives from power surges.
Nuclear power plants are designed, built, and operated with a "defence-in-depth" approach, employing multiple layers of protection to ensure safe operation even in the event of an accident. Traditional reactor safety systems are "active", involving electrical or mechanical operations on command, while some engineered systems operate passively, such as pressure relief valves. All reactors possess inherent safety features, and recent designs have incorporated passive safety systems to substitute for active systems in cooling, preventing accidents like Fukushima, where loss of electrical power resulted in a loss of cooling function.
Advanced reactors, such as the Westinghouse advanced passive pressurised water reactor AP1000, utilise passive safety features to continuously move heat away from the reactor core, preventing overheating. These reactors also have simpler designs, requiring fewer components, less maintenance, and fewer workers, reducing potential human error. The fuel cladding acts as a critical protection layer, preventing fuel corrosion and the spread of fuel material while trapping fission products to maintain safety.
Overall, the safety of electrical reactors, particularly nuclear power reactors, is a critical priority. Through a combination of intelligent planning, proper design, comprehensive safety procedures, robust training programs, and stringent regulations, electrical reactors can maintain high standards of safety for both workers and the public.
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Electrical reactor maintenance
An electrical reactor, also known as a line reactor or choke, is a coil that creates a magnetic field to limit current rise, reducing harmonics and protecting electrical drives from power surges. They are used to filter out harmonics present in DC power and play a crucial role in power systems, from filtering harmonics to facilitating communication and limiting fault currents.
Preventative Maintenance
Preventative maintenance is essential to avoid defects, downtime, and undesirable spraying results. It is important to relieve pressure before performing any maintenance procedures. This involves stopping pumps, turning off heat zones, and turning off the air supply to the feed pumps and agitator. Specific procedures, such as gun shutdown, should be referred to in the equipment manual.
Maintenance of Fission Reactors
Fission reactor maintenance depends on the reactor design. In water-moderated designs, all fuel and control rods are removed, and divers are sent in after the short half-life products have decayed. The water acts as a radiation shield once the fuel elements are removed. Commercial divers who perform this work are well-compensated and only work a few weeks per year due to exposure limits.
In graphite-moderated designs, maintenance may be performed by robots, or the damage may simply be lived with. Complicated core designs often require extensive maintenance, so simplicity is preferred to avoid this issue.
Maintenance of Fusion Reactors
Fusion reactors are expected to utilize robots for maintenance. This is partly due to the ultra-high vacuum environment, which aims to avoid contaminants like fingerprints, oils, moisture, and stray hair or skin inside the pressure vessel. Robotics can also encourage the development of supporting technology. However, historical experience with robotics inside reactor environments has been challenging, as it can be harsh on semiconductors, plastics, and metals.
Maintenance of Electrical Connections
To safely operate a nuclear reactor and facilitate critical operations such as monitoring, maintenance, and power transfer, dependable containment seals are necessary. Electrical Penetration Assemblies (EPAs), Electric Conductor Seal Assemblies (ECSAs), and Fiber Optics Feedthroughs enable the integration of monitoring, communication, and video surveillance. These assemblies can also be used for sealing conductors inside or outside of containment.
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Frequently asked questions
A reactor, also known as a line reactor or choke, is a coil used in power systems to control electricity. They are placed in the main parts of the electrical network, like near transformers or substations. Their main job is to manage current and keep voltage levels steady.
Reactors are classified by their application mode, construction, and operation. Some common types are:
- Shunt reactors
- Series reactors
- Damping reactors
- Tuning reactors
- Earthing transformers
- Arc suppression reactors
- Smoothing reactors
Reactors have multiple functions, including:
- Protecting electrical drives from power surges
- Filtering out unwanted signals known as harmonics
- Managing the flow of reactive power
- Limiting the flow of electric current
- Reducing stress on the system
