A: Fixed Mount or Draw out Circuit Breaker PanelsPark Low Voltage Switchgear Metal-Enclosed Low Voltage Switchgear with draw out or fixed insulated case and power circuit breakers is used in electric power distribution systems for the control and protection of circuit conductors and equipment. It is designed, manufactured and tested in accordance with ANSI and UL® standards, as well as NEMA standards. It is suitable for the most severe duty in such typical applications as waste water treatment, industrial plants, central generating stations, military bases, commercial and residential buildings. Available in indoor and outdoor walk-in construction, these units are used at system voltages of 600, 480, 240 and 208 volts. Circuit breakers may either be manually or electrically operated, fused or unfused. Check out these Park Special Features Space Saving Standard Sizes Flexible Mounting Arrangements Bolted Copper Bus with Silver Plated Connections Reduces Maintenance Circuit Breakers Ship in Cubicles: saves time and labor in handling, storage and installation. Insulated Bus and Cable/Bus Area Barriers: options that reduce risk of accidental contact with main bus and reduce the risk of main bus faults. Closed Door Racking and Complete Draw out on Telescoping Rails
A: RMU is sealed switchgear unit which is used in secondary distribution system and is sealed with Vacuum or SF6 gas. It protects the secondary transformer from transients either from load or source side. As it consists CB and isolators it serves the purpose of both and sealing of system adds advantage of low maintenance. It has another advantageous function in which the container gas (mainly SF6) pressure increases with voltage rise in container.
A: Why has metal-clad switchgear remained the industry's go to switchgear for medium voltage applications? There are three key drivers that make metal-clad the dominant choice: 1)customization capabilities, 2)ease of maintenance, and 3)enhanced safety features. Customization: One of the most attractive benefits of metal-clad switchgear is its ability to be fully customizable, based upon customers' specifications. Customization is based on how intricate the system application must be. But what does customization really mean? Metal-clad switchgear provides basic load protection; it operates based on the instructions of the relay that is installed. Therefore, the selection of the relay adds to the level of customization that is specified. Demanding or complex applications, e.g., zone selective interlocking may include current, voltage, and frequency protection features such as direction ground fault and phase overcurrent. Additional customization applications might require phase sequence and phase balance. As more advanced relay schemes are required, the relay size may change, directly affecting the amount of wiring detail that is required. Customization not only affects the relay/wiring schemes but the structure of the switchgear, as well. Different layout options allow metal-clad circuit breakers to be stacked one on top of another based upon the ampere of the switchgear. This usually provides adequate space for customization in the low voltage compartment, such as laying out additional switches, lights, alarm signals, racking ports, plugs, communication ports and so on. Ease of Maintenance: Maintenance needs vary based on customer application requirements. Some applications call for reduced switching of the equipment. Its main purpose is to function as a disconnect that continually operates in the ‘on’ position except for a yearly shutdown. Other applications require the equipment to switch from an ‘open-to-close’ or ‘on-to-off’ state more frequently. For these frequent switching applications, customers prefer equipment that can handle the constant use to operate the loads that are fed. Masterclad has quickly become a favorite in the switchgear industry. The ability to withdraw the circuit breaker from its compartment allows the electrical and mechanical parts to be monitored and maintained on a more frequent basis. A metal-clad circuit breaker has withdrawable finger clusters that allow the circuit breaker to be racked out of its compartment with the push of a button or racking handle. With the withdrawable feature, there is no requirement to provide a visual means of disconnect. Enhanced Safety: Metal-clad switchgear has enhanced safety features that are not mandatory in traditional metal-enclosed switchgear. For example, metal-clad is fully compartmentalized, which means the low voltage compartment is accessible without allowing access to any other live parts in the switchgear. The main bus and incoming bus are also separated. It is a fully grounded unit with grounded barriers, mechanical interlocks, circuit breaker shutters and fully insulated bus, which keeps operators segregated from the medium voltage sections.
A: These are large switches that act as safety devices to quickly shut off power to a circuit when there is too much electricity flowing through it. Typically, when that happens, the breaker will switch to the “off” position. Electrician's say that the circuit breaker for that zone has“tripped". Most of the circuit breakers in your breaker box are single pole breakers. Some of the circuit breakers — the ones that look like two single breakers stuck together — are double pole breakers. These are for the large appliances in your home like your refrigerator, stove, clothes dryer, water heater, etc. There are also some “special purpose” breakers designed to provide your home with extra protection from fire and electrocution.
A: This is where the electricity that powers your home comes into the electrical panel. The service disconnect — sometimes called the main breaker — looks like a larger version of a circuit breaker and is usually found at the very top or bottom of the breaker box. In case of emergency, this is where you can turn off power to your home by rocking the switch to the “off” position.
A: The essential features of switchgear are : Complete reliability: With the continued trend of interconnection and the increasing capacity of generating stations, the need for a reliable switch gear panel has become of paramount importance. This is not surprising because switchgear is added to the power system to improve the reliability. When fault occurs on any part of the power system, the switchgear must operate to isolate the faulty section from the remainder circuit. Absolutely certain discrimination: When fault occurs on any section of the power system, the switchgear must be able to discriminate between the faulty section and the healthy section. It should isolate the faulty section from the system without affecting the healthy section. This will ensure continuity of supply. Quick operation: When fault occurs on any part of the power system, the switchgear must operate quickly so that no damage is done to generators, transformers and other equipment by the short-circuit currents. If fault is not cleared by switchgear quickly, it is likely to spread into healthy parts, thus endangering complete shut down of the system Provision for manual control: A switch gear panel must have provision for manual control. In case the electrical (or electronics) control fails, the necessary operation can be carried out through manual control.
A: Switchgear covers a wide range of equipment concerned with switching and interrupting currents under both normal and abnormal conditions. It includes switches, fuses, circuit breakers, relays and other equipment. A brief account of these devices is given below. 1. Switches A switch is a device which is used to open or close an electrical circuit in a convenient way. It can be used under full-load or no-load conditions but it cannot interrupt the fault currents. When the contacts of a switch are opened, an arc is produced in the air between the contacts. This is particularly true for circuits of high voltage and large current capacity. The switches may be classified into air switches oil switches. The contacts of the former are opened in air and that of the latter are opened in oil. (i) Air-break switch - It is an air switch and is designed to open a circuit under load. In order to quench the arc that occurs on opening such a switch, special arcing horns are provided. (ii) Isolator or disconnecting switch - It is essentially a knife switch and is designed to open a circuit under no load. (iii) Oil switches. As the name implies, the contacts of such switches are opened under oil, usually transformer oil. 2. Fuses A fuse is a short piece of wire or thin strip which melts when excessive current flows through it for sufficient time. It is inserted in series with the circuit to be protected. When a short circuit or overload occurs, the current through the fuse element increases beyond its rated capacity. This raises the temperature and the fuse element melts (or blows out), disconnecting the circuit protected by it. 3. Circuit Breakers A circuit breaker is an equipment which can open or close a circuit under all conditions viz. no load, full load and fault conditions. It is so designed that it can be operated manually (or by remote control) under normal conditions and automatically under fault conditions. For the latter operation, a relay circuit is used with a circuit breaker 4. Relays A relay is a device which detects the fault and supplies information to the breaker for circuit interruption. When a fault occurs the relay contacts are closed and the trip coil of the circuit breaker is energized to open the contacts of the circuit breaker.
A: An intelligent switchgear power system can overcome the disadvantages of common electric switchgear power systems by utilizing efficient internal computer technology that can perform such functions as: System diagnosis Electric fire prediction prevention Electric power demand prediction There are many methods and designs available currently for intelligent switchgear power systems, however, one that you might want to consider is an intelligent switchgear power system entitled a “neural networks (NN).” This type of artificial intelligent switchgear power system is especially known for their excellent abilities in pattern recognition and prediction. Ultimately, NN switchgear power systems are capable of detecting electric sparks that have the potential to cause electrical fires, and predict monthly power demand in a load network. Common electronic switchgear power systems can be grossly improved with the addition of a NN, which is a simple, fast and cost-effective approach for computation of the required functions in a complex system such as the power utility network.
A: The current switchgear power system does not possess the following important utilities: switchgear power systems should diagnose defects and malfunctions in order to prevent fires due to electricity. switchgear power systems should predict the electric power demand for a month’s period of time in order to manage electrical efficiency. When these shortcomings are included, the cost can be potentially prohibitive and the shear size of the switch gear panel power system can become a hindrance.
A: Most of us are unaware of how complex and intricate an electrical system really is. In addition, if you asked any common lay person what a switch gear panel power system is, most of their faces would be as blank as an empty page. Yet, we all depend on the wonders of electricity. It simply powers our life. From our homes, to our cars, to our gadgets, and to our jobs – we’re addicted to it. Don’t believe us? What happens when there’s a power outage? Sure some of us sigh comfortably from the silence; but the masses of us go stir crazy. And behind almost all of these electrical comforts, is a switch gear panel power system that is making the invisible magic possible. However, as wonderful as electricity has been, we have also suffered from the many tragedies that electrical mishaps can cause. As a result, power supply manufacturers have worked diligently to create what is called an intelligent switchgear power system that has the ability to manage electric power within a residence or business in order to improve electrical efficiency and safety.