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True DC
True DC is a type of switch disconnect (isolator) used in solar photovoltaic installations, in accordance with EN 60364–7–712. It was created by UK based IMO Precision Controls Ltd, and later adopted by other manufacturers such as Senton and ABB. The isolator design ensures a very fast break/make action by incorporating a user-independent switching action. As the handle is moved, it interacts with a spring mechanism causing the contacts to "snap" over upon reaching a set point. This mechanism means that the disconnection of the load circuits and the suppression of the electrical arc, produced by a constant DC load, is normally extinguished in a maximum of 5 milliseconds (MS), using the specific pole suppression chambers incorporated into the design. Many alternative solutions, particularly those based upon an AC Switch Disconnect design which use bridge contacts, have been modified and rated for DC operation. These types of products have a switching speed that is directly lin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disconnector
In electrical engineering, a disconnector, disconnect switch or isolator switch is a type of switch, switching device with visible Electrical contact, contacts, used to ensure that an electrical circuit is completely de-energized for service or maintenance. They are often found in electrical distribution and industrial applications, where machinery must have its source of driving power removed for adjustment or repair. Disconnectors can be operated manually or by a motor, and may be paired with an earthing switch to ground the portion that has been isolated from the system for ensuring the safety of equipment and the personnel working on it. High-voltage disconnectors are used in electrical substations to allow isolation of apparatus such as circuit breakers, transformers, and transmission lines, for maintenance. The disconnector is usually not intended for normal control of the circuit, but only for safety isolation. Unlike load switches and circuit breakers, disconnectors lack ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solar Photovoltaic
A photovoltaic system, also called a PV system or solar power system, is an electric power system designed to supply usable solar power by means of photovoltaics. It consists of an arrangement of several components, including solar panels to absorb and convert sunlight into electricity, a solar inverter to convert the output from direct to alternating current, as well as mounting, cabling, and other electrical accessories to set up a working system. Many utility-scale PV systems use tracking systems that follow the sun's daily path across the sky to generate more electricity than fixed-mounted systems. Photovoltaic systems convert light directly into electricity and are not to be confused with other solar technologies, such as concentrated solar power or solar thermal, used for heating and cooling. A solar array only encompasses the solar panels, the visible part of the PV system, and does not include all the other hardware, often summarized as the balance of system (BOS). ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Millisecond
A millisecond (from '' milli-'' and second; symbol: ms) is a unit of time in the International System of Units equal to one thousandth (0.001 or 10−3 or 1/1000) of a second or 1000 microseconds. A millisecond is to one second, as one second is to approximately 16.67 minutes. A unit of 10 milliseconds may be called a centisecond, and one of 100 milliseconds a decisecond, but these names are rarely used. To help compare orders of magnitude of different times, this page lists times between 10−3 seconds and 100 seconds (1 millisecond and one second). ''See also'' times of other orders of magnitude. Examples The Apollo Guidance Computer used metric units internally, with centiseconds used for time calculation and measurement. *1 millisecond (1 ms) – cycle time for frequency 1 kHz; duration of light for typical photo flash strobe; time taken for sound wave to travel about 34 cm; repetition interval of GPS C/A PN code *1 millisecond – time taken ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rotary "Knife Contacts"
Rotary may refer to: Science, engineering and technology * Rotary motion * Rotary dial, a rotating telephone dial * Rotary engine (other), multiple types of engines called "rotary" * Rotary latch * Rotary milking shed, a type of milking shed used in the dairy industry * Rotary snowplow, one type of railroad snowplow used especially for deep snow removal * Rotary system, a type of pre-electronic telephone switch * Rotary table (drilling rig), a device used to apply directional force to a drill string * Rotary tiller, a motorised cultivator * Rotary woofer, a type of loudspeaker capable of producing very low frequency sound * Rotary wing aircraft Organisations and enterprises * Rotary International, or Rotary Club, an international service organization founded in the United States ** Rotary Foundation, non-profit foundation of Rotary International ** Rotary Scholarships, scholarships offered by the organization * Rotary Watches, a Swiss watchmaker Other uses * Rotary (in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knife Switch
A knife switch is a type of switch used to control the flow of electricity in a electrical circuit, circuit. It is composed of a hinge which allows a metal lever, or ''knife'', to be lifted from or inserted into a Groove (engineering), slot or jaw. The hinge and jaw are both fixed to an Electrical insulation, insulated base, and the knife has an insulated handle. Current flows through the switch when the knife is pushed into the jaw. Knife switches can take several forms, including ''single-throw'', in which the knife engages with only a single slot, and ''Switch#Contact_arrangements, double-throw'', in which the knife hinge is placed between two slots and can engage with either one. Multiple knives may be attached to a single handle and can be used to activate more than one circuit simultaneously; this is a ''multi-pole'' switch. Current uses Though used commonly in the past, knife switches are now rare, finding use largely in science demonstrations where the exposed mechanic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
