Maintenance electrician explain common name

by:Mings     2020-05-23
1, the three-phase alternating current (ac) : consists of three same frequency, equal potential amplitude, phase difference and difference of 120 ° Angle of power system composed of ac circuits, called three-phase alternating current. 2, an equipment: is directly related to production of electric energy and electric power transmission and distribution equipment is called a device. Including all kinds of high voltage circuit breaker, isolating switch, bus, power cable, voltage transformer, current transformer, reactor, lightning arrester, the arc suppression coil, shunt capacitors and hv fuse, etc. 3, secondary device: a device for monitoring, measurement, control and protection of the auxiliary equipment. Such as all kinds of relays, signal device, measuring instruments, wave record recording device and remote sensing, remote communication device and a variety of control cable, small bus, etc. 4, high voltage circuit breaker: also called high voltage switch, it can not only cut off or close the no-load current and load current in high voltage circuit, and when a system failure occurs, through the role of relay protection device, to cut off the load current and short circuit current. It is quite perfect arcing structures and sufficient flow ability. 5, load switch, load switch structure and the secret of isolating switch are similar, just with a simple arc extinguishing device. It also has an obvious disconnect point, have certain ability to block, can take the load operation, but no direct disconnect short-circuit current, if necessary, to rely on concatenated high-voltage fuse to achieve with it. 6, air circuit breaker ( Automatic switch) : is to use manual ( Or electric) Closing, use lock keep closing position, the tripping mechanism ACTS on the trip with arc extinguishing device of low voltage switch, is widely used in under 500 v ac, dc device, when in the circuit overload, short circuit, voltage reduced or disappeared, can cut off the circuit automatically 7, cable: by conductor ( Conductive part) , plus the insulation layer and protective layer of three parts of wire is called a cable. 8, bus, electric bus is the access of the collection and distribution of electric power equipment, it determines the number of distribution equipment equipment, and in what way to connect the generator, transformer and circuit, and how to connect to the system to complete the transmission and distribution tasks. 9, current transformer, also called instrument with converter, is a large current into a small current instruments. 10, transformer: a static electrical equipment, is used to turn a numerical ac voltage into the same frequency of one or more of the following numerical different ac voltage of the device. 11, high-pressure test pen: used to check the high voltage distribution network equipment, overhead lines, cable whether electric tools. 12, grounding line, to the surprise appearance has power equipment and line voltage to ensure staff's important tool. According to the provisions of the enterprise in ground wire must be at least 25 mm 2 bare copper cord. 13, signs: used to warn people not close to the equipment and charged part, instructions for personnel work, remind to take safety precautions, and banning trace of a device or circuit switching power on a long period of the sign. Can be divided into the warning classes, allowing, prompt and banned the and so on. 14, covering bar: to prevent staff had no intention of encounter charged equipment parts and equipment screen protector, temporarily hide column and permanent column two. 15, insulating rod: also called the g rods, insulating rod, operation, etc. Insulating rods by working head, insulation and handle three parts. It in a closed or open high-voltage isolating switch, portable earthing line installation, as well as the measurement and test. 16, step voltage: if the ground horizontal distance of 0. 8 m have a potential difference between two points, when the two feet of human exposure to the two points, in the human body will withstand voltage, the voltage is called the step voltage. * * * * * * step in distance from the ground of the grounding body level 0. Between the grounding body and 8 m. Is 17, phase sequence, phase sequence, is an alternating current instantaneous value changes from negative to positive after zero order in turn. 18, power grids, power grid is part of the power system, it is by all kinds of transformer substation ( The) And the output of all sorts of different voltage grade, power distribution lines join together into a unified network. 19, electric power system, power system is a part of power system, it is composed of power plant generators and power distribution equipment, step-up and step-down substation, transmission and distribution lines and the users of electricity equipment. 20, power system, power plants, substation and power users of electricity equipment, and to power grid and the thermal network ( Or hydraulic) System connected is called dynamic system as a whole.
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