Industrial Technology: 43 Electrical Terms That Engineers Must Know

Electricity is the general term for the discipline or engineering of the production, transmission, distribution, use and manufacture of electrical equipment. It is a science that creates, maintains and improves limited space and environment by means of electrical energy, electrical equipment and electrical technology. It covers the conversion, utilization and research of electrical energy, including basic theory, applied technology, facilities and equipment.


1, active power - In the process of transmission and reception of AC power, the part of energy used to convert to electromagnetic form is called active power

2, reactive power - in the process of transmitting and receiving AC power, the part of the energy used for the exchange of electromagnetic fields in the circuit is called reactive power

3, the power system - from the generator, power distribution devices, step-up and step-down substations, power lines and power users composed of the overall called the power system. Neutral displacement: In the three-phase circuit, the power supply voltage symmetrical three-phase load case, if the three-phase load is also symmetrical, then no matter with or without neutral point, the neutral point voltage is zero. However, if the three-phase load is asymmetric, and there is no neutral or neutral impedance larger, then the voltage appears at the neutral point, a phenomenon known as the neutral point displacement phenomenon.

4, over-voltage operation - due to circuit breaker operation and short circuit or ground fault caused by transient voltage increases, known as the operation of over-voltage;

5, Resonance over-voltage - due to circuit breaker operation caused by the power grid circuit is split or with iron core element tends to be saturated, resulting in a loop inductance and capacitance meet the resonant conditions, may cause resonance and the voltage rise, known as the resonance Overvoltage.

6, the main electrical wiring - mainly refers to the power plants, substations, power systems, in order to meet the predetermined power transmission and operation requirements designed to show that high-voltage electrical equipment connected to the relationship between the transmission of electrical energy Circuit.


7, double busbar wiring - it has two bus: working bus I and spare bus l. Each circuit is connected to two groups of busbars via a circuit breaker and two groups of isolating switches respectively. The busbars are connected by a busbar connecting circuit breaker (referred to as busbubble) for short, called a double busbar connection.

8, one and a half circuit breaker wiring - every two components (outlet or power) with three circuit breakers constitute a series connected to two groups of bus, called a half circuit breaker wiring, also known as 3/2 wiring.

9, Power Plant - In the process of starting, running, stopping and overhauling, there are a large number of mechanical equipment driven by electric motor to ensure the main equipment of the power plant and the main equipments of coal-fired unit, coal scrapping, ash removal, dust removal and Water treatment and other auxiliary equipment normal operation. These motors and the whole plant operation, operation, testing, maintenance, lighting and other electrical equipment belong to the plant with the load, the total power consumption, collectively referred to as plant electricity.

10, the rate of plant electricity - plant electricity consumption accounted for the percentage of the total generating capacity of power plants, known as the plant electricity rate. Plant electricity rate is one of the main economic indicators of power plant operation.

11, often load - every day to often run continuously using the motor;

12, infrequent load - only in the repair, accident or start and stop the furnace during the load used;

13, continuous load - each continuous operation more than 2h load;

14, short-term load - each operation only 10-120min load;

15, intermittent load - repeated cyclical work, each cycle does not exceed the load of 10min.

16, motor self-starting - the normal operation of the motor in the plant system, "when its power supply bus voltage suddenly disappeared or significantly reduced, after a short period of time (usually 0.5-1.5s) at the end of its rotation has dropped a lot or not Before stalling, the factory bus voltage returned to normal (such as power troubleshooting or standby power supply automatically), the motor will accelerate itself to return to normal operation, the process is called motor self-starting.

17, lost magnetic - a sudden loss of synchronous generator or all of the lost excitation is called loss of magnetism.

18, excitation control system - by the excitation regulator, excitation power unit and the generator itself together constitute the entire system called the excitation control system.

19, self-shunt static excitation system - the transformer connected to the generator outlet. (Called excitation transformer) as the excitation power supply, after the silicon rectifier supply excitation. Due to the excitation transformer in parallel with the generator outlet, so this excitation is called self-excitation method, excitation transformers, rectifiers are static components, it is also known as self-shunt static excitation system.

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20, Transformer - is the power system measuring instruments, relays and automatic devices and other secondary equipment to obtain electrical circuit information of a sensor. Transformer is the role of high voltage, high current proportional to low voltage and low current.

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