31. How many modes are there for the three-phase neutral point operation of China's power system?
Answer: 1. Three-phase system with no grounding (insulation) at the neutral point; 2. Three-phase system in which the neutral point is grounded through the arc suppression coil; 3. Three-phase system with direct grounding at the neutral point.
32. What should I pay attention to when using a current transformer?
Answer: 1. The secondary side shall not be open when working; 2. One end of the secondary side must be grounded; 3. The polarity of the terminal should be paid attention to when connecting.
33. What should I pay attention to when using voltage transformers?
A:1. When working, its secondary side shall not be short-circuited; 2. One end of its secondary side must be grounded; 3. Pay attention to the polarity of its terminals when connecting.
34. What are the principles for drawing and reading the schematic diagram of electrical control circuits?
Answer: A. The schematic diagram is generally divided into power supply circuit, main circuit, control circuit, signal circuit and lighting circuit.
B. In the schematic diagram, the position of the contacts of each electrical appliance is drawn according to the normal position when the circuit is not energized and not affected by external force, and the normal position of the contact should be started when analyzing the principle.
C. In the schematic diagram, the actual outline diagram of each electrical component is not drawn, but the unified national standard symbol stipulated by the state is used.
D. In the schematic diagram, the electrical components are not drawn together according to their actual positions, but are drawn in different circuits according to their functions in the circuit, but their actions are related to each other and must be marked with the same text symbols.
E. In the schematic diagram, the crosswire connection point with direct electrical contact should be represented by a small black dot, and the crosswire connection point without direct electrical contact should not be marked with a small black dot.
35. What is current protection and how does it work?
Answer: when the line is short-circuited, one of the important characteristics is that the current in the line increases sharply, when the current flows through a certain predetermined value, the protection device that responds to the current rise and action is called overcurrent protection, the action current of overcurrent protection is considered according to the maximum load current, and its selection is matched by the time limit of the step.
36 What are the main differences between electronic control equipment and power distribution equipment products?
Answer: The function of electronic control equipment is mainly control, and the function of power distribution equipment is mainly transmission.
37 How much is the external design of domestic electronic control equipment products?
Answer: control panel, control cabinet, control box and console, etc.
38 How much is the external design of domestic power distribution equipment products?
Answer: Front panel type, cabinet type and box type, but also indoor type, fixed type and component fixed assembly, some products use drawer cabinets.
39 Power Transmission Circuit?
Answer: The line erected between the step-up substation of the power plant and the regional substation and the line between the regional substation is a line dedicated to the transmission of electric energy.
40 Power Distribution Circuits?
Answer: From the regional substation to the substation of the electricity unit or the power supply line of the city and township, it is the line used to distribute electric energy.
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