1. What is TT, IN, IT system?
A: The TT method refers to a protection system that directly grounds the metal shell of electrical equipment, which is called a protective grounding system, also known as a TT system. The TN method is a protection system that connects the metal shell of the electrical equipment with the working neutral line, which is called the zero connection protection system, which is represented by TN. The IT approach is that there is no working ground on the power side, or a high-impedance ground. A protection system for grounding protection of load-side electrical equipment.
2. What is the standard frequency of China's power grid?
Answer: It is 50Hz, also known as power frequency.
3. What is the classification of the electrical load?
Answer: Primary load: those who will cause personal injury or death due to the interruption of power supply; or those that will cause significant damage politically or economically. Secondary load: The secondary load is the one that will cause greater political and economic losses if the interruption of power supply is interrupted, and the tertiary load: the tertiary load is the general power load.
4. What is an electric arc?
Answer: Arc is a physical phenomenon generated in the operation of electrical equipment, which is characterized by strong light and high temperature.
5. What is a substation?
A: It is a power supply hub that receives electrical energy from the power system, transforms (boosts or downgrades), and then distributes the power.
6. What are the well-known international and domestic brands of high and low voltage electrical appliances?
Answer: Internationally: 157. What is phase voltage, phase current? Line voltage, line current?
Answer: In a three-phase four-wire circuit, the voltage of the phase line and the center line is the phase voltage; The voltage between any two phase lines is the line voltage; The line voltage is √ 3 times that of the phase voltage. The current flowing through each phase load is the phase current; The current flowing through the phase is a line current.
7. What is the main role of transformer in the power system?
Answer: The main function is to convert the voltage to facilitate the transmission of power. On the same section of the line, the same power is transmitted, and after the voltage is boosted by the step-up transformer, the current transmitted by the line is reduced, which can reduce the line loss, improve the transmission economy, and achieve the purpose of long-distance power transmission, while the step-down can meet the needs of users at all levels of voltage.
8 What are the main parameters of the transformer?
Answer: (1) rated voltage; (2) Rated current; (3) Rated capacity; (4) No-load current; (5) No-load loss; (6) Short-circuit loss; (7) Impedance voltage; (8) Winding connection diagram, phasor diagram and connection group number.
9. What is the thermal effect of a short-circuit current?
Answer: When a short circuit occurs in a circuit, a large short circuit current will cause the conductor temperature to rise rapidly, which is called the thermal effect of the short circuit current.
10. What is a vortex? What are the harms of eddy currents?
Answer: When an alternating current is passed through a wire, an alternating magnetic field is created around the wire. The induced current is generated inside the whole conductor in the alternating magnetic field, and this induced current is called eddy current because it forms a closed loop inside the whole conductor, much like the vortex of water. Eddy current will not only lose electrical energy in vain, reduce the efficiency of electrical equipment, but also cause electrical appliances (such as transformer cores) to heat up, which will affect the normal operation of equipment in serious cases.
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Common fault codes and handling methods for Rittal cabinet air conditioners
1. E0: Indoor temperature sensor is faulty. When this fault code appears, you need to check whether the indoor temperature sensor is working properly.
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
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3. Check the function of Rittal air conditioner.
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1. Press and hold the H4 button for 5 seconds to enter programming mode and ST will be displayed on the screen.
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
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Note:
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Now I would like to introduce the Rittal explosion-proof enclosure
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
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