11. What is the definition and classification of secondary circuits?
Answer: The secondary circuit is used to monitor the measuring instrument, control the operation signal, all the low-voltage circuits of the relay and automatic devices are called the secondary circuit, and the secondary circuit can be divided into (1) current circuit according to the power supply and use; (2) voltage circuit; (3) operation loop; (4) Signal circuit.
12. What are the common decompression starting methods of cage asynchronous motors?
Answer: (1) Three-phase resistance decompression start.
(2) The reactor starts under reduced pressure.
(3) Autotransformer decompression start.
(4) Star delta decompression start.
(5) Extended edge triangle decompression start.
13. What conditions should be met for transformers to run in parallel?
Answer: The conversion ratio is equal, the connection group is the same, and the short-circuit voltage is the same.
14. Why use transformers to measure high voltage and high current?
Answer: (1) Expand the scope of use of the instrument. A wide range of voltages and currents can be measured as long as transformers with different transformer ratios and transformers are used in conjunction with a voltmeter with a full voltage of 100V and an ammeter with a full current of 5A.
(2) Make the specifications of instruments and relays unified, easy to standardize, and mass production.
(3) The use of transformer as an intermediate element between the primary circuit and the secondary circuit isolates the danger of high voltage, and also prevents the impact of the secondary circuit failure on the primary circuit.
15. What is a switchgear?
Answer: It is mainly used for power generation, transmission, distribution, and power conversion related switching appliances and the combination of control, detection, protection and regulation equipment associated with these switching appliances.
16. What is a control device?
Answer: It is mainly used to control the switching appliances of the powered equipment and the combination of control, detection, protection and regulation equipment associated with these switching appliances.
17. What is overcurrent?
A: Any electricity that exceeds the rated current.
18. How is electric current formed?
Answer: The free electrons in the conductor move regularly and directionally under the action of the electric field force, and an electric current is formed.
19. What are the indicators of power quality?
Answer: Voltage deviation, voltage fluctuation and flicker, voltage sine wave distortion rate, frequency deviation.
20. What are the conditions that must be met for high-voltage electrical appliances?
Answer: A. The insulation is safe and reliable, B. It can operate for a long time under the rated current and has a certain short-term overload capacity, C. It can carry the thermal effect and electrodynamic effect of the short-circuit current without damage, D. The switching electrical appliance can safely and reliably close and close the specified current, and E. The outdoor one should withstand certain natural disasters.
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
Which electrical equipment must be grounded or zeroed?
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The Rittal SE 8 system cabinet shows you what efficiency looks like
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