Knowledge of complete sets of electrical equipment

1, what is the rated voltage?

Equipment, and with the power system and some of the operating characteristics of the phase-to-phase voltage RMS.

2, what is the nominal rated voltage?

Under the specified conditions, to ensure that the electrical work of the voltage value.

3, what is the rated insulation voltage?

Under the specified conditions, used to measure electrical and parts of different parts of the insulation strength, electrical clearance and creepage distance of the nominal voltage, unless otherwise specified, this value is the maximum rated operating voltage of the electrical.

4, What is the rated current?

Switching equipment in the specified conditions, can be long-term work through the current value.

5, what is the rated operating current?

Under the specified conditions, to ensure that the electrical current value of normal work.

6, what is direct current?

Direct current refers to the current direction of a certain, and the size of the same current, such as dry batteries.

7, what is the AC?

Refers to the direction, the size of the current changes with time.

8, What is current?

Electrons in the body under the action of the electric field, there are rules to move in one direction to form a current. Current & quot; I & quot ;. The current intensity is numerically equal to the amount of electricity passing through the conductor cross-section in one second, usually expressed in amperes "A", where A, KA, mA, and uA are representations of different units.

9, what is the voltage?

Water must have a water level to flow, and similarly, to make a regular charge of the movement, must have a potential difference at both ends of the circuit, which is called the voltage, with the symbol "U", the value is usually volts "V" Said, there are V, KV, mV, uV, said several units.

A power supply (generator, battery) can make the current continues to flow along the circuit, because it can make both ends of the circuit to generate and maintain the potential difference is called the power of the electromotive force, with "E" said; unit "V" The relationship between the size of the current, and the voltage across the resistor is proportional to the size, inversely proportional to the size of the resistance.

10, what is Ohm's law?

R = U / I Where: U: voltage, R: resistance, I: current, that is, the circuit voltage and current ratio.

U = I × R I = U / R R = U / I

11, what is the node?

Three or more circuits, the intersection of components called nodes.

12, what is slip road?

The circuit between two nodes is called branch.

13, what is the loop?

Any closed circuit is called a loop.

14, what is the main loop?

The switching device is intended to close and disconnect all conductive parts of the circuit.

15, what is the control loop?

Switchgear, in addition to the main circuit, the access to open, close; Hop, sub-gate operation of all the conductive part of the circuit.

16, what is the auxiliary circuit?

In the switchgear, all the conductive parts except the main circuit and the control loop.

17, what is short-circuit? What are the consequences of a short circuit?

If the two leads of the power supply lead to the load are not directly connected to each other through the load, the power supply is short-circuited.

Because the short-circuit current is much greater than the normal operating current, such a large current can lead to overheating of electrical equipment, and even burned electrical equipment, causing a fire. At the same time, short-circuit current will produce a lot of electric power, resulting in damage to electrical equipment, serious circuit breaking accident and even damage the stability of the power system, so the operation of electrical equipment should take some protective measures, such as installation of automatic switch, Fuses and so on.

18, what is the three-phase circuit neutral power? What is three-phase three-wire power supply? What is three-phase four-wire power supply?

To connect the three-phase winding of the power supply into a star, certain rules of connection must be observed.

This rule is the three winding of the X, Y, Z together, this is called the generator neutral point, usually called zero.

Star or delta wiring of the three-phase AC system, with three wires to transmit power, called three-phase three-wire power supply. The three conductors are connected to the ends A, B, and C of the star or delta connection, respectively

Three-phase AC star (also known as "Y") system, with four wire transmission power, called three-phase four-wire power supply. Three of the wires are connected to the three-phase terminals A, B, and C, and one conductor is connected to the neutral point

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