Rittal cabinet - knowledge quiz of high and low voltage distribution cabinet (41-50)

Create Date: 2024-8-30 12:03:23|Source: Rittal/Rittal

41. Can power lines be divided into according to the erection method?

A: Overhead power lines and cable lines.

42 What is a protective relay?

Answer: It can reflect the failure or abnormal operation of electrical equipment in the power system, and act on the device that trips the switch or sends out a signal.

43 What are the commonly used relays?

A: Current Relay, Voltage Relay, Signal Relay, Time Relay, Intermediate Relay, Differential Relay, and Gas Relay, etc.

44 How many types of protection devices are there for transformers?

A: Overcurrent protection, current quick break protection, differential protection and gas protection.

45 What are the requirements for relay protection?

Answer: In order to be able to remove faults correctly and quickly, relay protection is required to have sufficient selectivity, rapidity, sensitivity and reliability.

46 What are the relay protections of small and medium-sized substations?

A: A overcurrent protection; B. Current quick-break protection; C. Time-limited current quick break protection; D Low voltage protection.

47 Classification of substation monitoring system?

A: Manual monitoring, automatic monitoring of telecontrol device and automatic monitoring of microcomputer.

48. What are the advantages of microcomputer automatic monitoring?

Answer: The device is small in size, high in reliability, has the functions of information storage, memory, calculation and logical judgment, and can collect, process, print and display the data.

49 What is overvoltage?

Answer: Voltages that are dangerous to insulation are collectively referred to as overvoltages.

50 What are the classifications of different electrical experiments according to their roles and requirements?

A: It can be divided into insulation test and characteristic test.
Rittal cabinet - knowledge quiz of high and low voltage distribution cabinet (41-50)

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