Electrical engineering and its automation knowledge

- Nov 01, 2017 -

1, three-phase AC: by the same frequency, the potential amplitude is equal, the phase difference between the 120 ° angle of the AC circuit composed of the power system, called three-phase AC.

2, a device: directly with the production of electricity and transmission and distribution of equipment known as a device. Including a variety of high-voltage circuit breakers, disconnectors, bus, power cables, voltage transformers, current transformers, reactors, arrester, arc suppression coil, shunt capacitors and high-voltage fuses.

3, secondary equipment: a device for monitoring, measurement, control and protection of the role of auxiliary equipment. Such as various relays, signaling devices, measuring instruments, recording and recording devices and telemetry, remote devices and a variety of control cables, small bus and so on.

4, high-voltage circuit breaker: also known as high-voltage switch, it can not only cut off or close the high-voltage circuit in the no-load current and load current, and when the system fails, through the relay protection device, cut off the load current and short-circuit current The It has a very perfect arc-quenching structure and sufficient drying capacity.

5, the load switch: load switch structure secret isolation switch similar, but the installation of a simple arc device. It also has a clear disconnect point, there is a certain drying capacity, can carry the load operation, but can not directly disconnect the short-circuit current, if necessary, to rely on it in series with the high-voltage fuse to achieve.

6, air circuit breaker (automatic switch): is a manual (or electric) closing, with a lock to keep the closing position, by the trip mechanism for tripping and with the arc device low-voltage switch, is currently widely used in 500V The following AC and DC devices, when the circuit occurs overload, short circuit, voltage drop or disappear, can automatically cut off the circuit.

7, cable: by the core (conductive part), plus insulation and protective layer composed of three parts of the cable called the cable.

8, bus: electrical bus is the collection and distribution of electrical energy access equipment, which determines the number of power distribution equipment, and that in what way to connect generators, transformers and lines, and how to connect with the system to complete the transmission and distribution tasks The

9, current transformer: also known as instrument converter, is a high current into a small current instrument.

10, the transformer: a static electrical equipment, is used to change the value of a certain AC voltage of the same or several different values of the AC voltage of the device.

11, high-voltage test pen: used to check the high-voltage network power distribution equipment, overhead lines, cables are charged tools.

12, ground wire: is in order to power outages and equipment on the line unexpectedly when the voltage to ensure that the staff an important tool. According to the ministerial requirements, the ground wire must be made of 25mm 2 or more bare copper cord.

13, signs: used to warn people not to close the equipment and live parts, indicating the workplace prepared for the staff to remind the safety measures, and prohibit the amount of a certain device or a section of the circuit to close the power of the signs. Can be divided into warning class, allow classes, prompt classes and prohibited in the wait.

14, shelter: To prevent the staff did not intend to meet the part of the charged equipment and equipment installed on the screen, sub-temporary shelter and standing shelter two.

15, insulation rods: also known as grams of rods, insulation rods, such as operating rod. Insulation rod by the work head, insulation rod and grip three parts. It is used for closed or bit high-voltage isolation switches, disassembly of portable ground lines, and for measurement and testing.

16, step voltage: If the horizontal distance of 0.8m on the ground between the two potential difference, when the human body feet touch the two points, the body will withstand the voltage, this voltage is called step voltage. The maximum step voltage appears between the ground level of the ground from the ground at 0.8 m and the ground.

17, phase sequence: that is, the order of the phase, the instantaneous value of alternating current from negative to positive value changes through the order of zero value.

18, power network: the power grid is part of the power system, it is by the various substations (the) and a variety of different voltage levels of transmission and distribution lines connected together to form a unified network.

19, the power system: the power system is a part of the power system, which by the power plant generators and power distribution devices, step-up and step-down substation, transmission and distribution lines and the user's electrical equipment.

20, power system: power plants, substations and users of electrical equipment, the phase to the power grid and heat (or hydraulic) system connected to the overall called the power system.

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