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.
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Some advantages of the Rittal compact AE enclosure
The Rittal compact AE cabinet with its new internal expansion rails
–Supplementary internal expansion for machining
– Can be done in a time-saving manner in the side, bottom and top cover areas
Installation
– Two rows of adjustable TS 8 system holes for installation capacity
Outer space...
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
Why use transformers to measure high voltage and high currents?
Answer:
(1) Expand the scope of use of the instrument. As long as the transformer with different transformer ratios and converter ratios is used in conjunction with a voltmeter with a full voltage of 100V and an ammeter with a full current of 5A, it will be ...
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Smart ships, low...
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Rittal cabinets – the characteristics of GDD and GCK low-voltage distribution cabinets
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Structural features
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Rittal innovates the Ri4Power top-of-the-line distribution cabinet system
Ri4Power satisfies four specifications of the system
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Rittal cables – the meaning of the first letter of the number of the control cable
First of all, the number of the control cable often starts with the letter "C", which indicates that the control cable is specially designed to connect different sensors and control devices as a medium for signal transmission. This cable can transmit data signals and has a certain resistance to wear and chemical corrosion, so ...
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Rittal cabinets – what are the installation specifications for the cabinets?
1. The host, storage equipment, and server cabinets should be partitioned and arranged, and the host, storage equipment, server cabinets, UPS power supplies, precision air conditioners and other equipment should be set aside for maintenance according to product requirements, and the maintenance interval overlaps with adjacent equipment;
2. Enter the equipment in the computer room in stages.
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Rittal cabinet air conditioner fault code
The fault codes for Rittal cabinet air conditioners are: F1, F2, F3, FF, EH, EP, EL, SF, HC.
F1, F2, F3 represent improper use or failure of internal components;
FF stands for Regulation Circuit Fault;
EH stands for High Temperature Fault;
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Rittal Cables – an introduction to the structure of industrial control cables
1. Conductor
It is the main component of the product to play its use function, and it is to transmit electricity or information, that is, to transmit electric current or electromagnetic waves on the conductor. The conductor is the basic and indispensable main component of the product for the transmission of electric current or electromagnetic wave information.
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
What are the basic requirements for a high-voltage circuit breaker?
A: A. Reliable work;
B. Have sufficient circuit breaking capacity
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D. Simple structure and low price.
What is the purpose of the disconnector?
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Rittal wall-mounted air conditioner with high energy efficiency Blue e+ 1.6-5.8 kW with an average energy saving of 75%
Rittal wall-mounted air conditioner Blue e+ 1.6-5.8 kW
Product model 3185.830
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Alarm code causes and diagnostic methods for Rittal cabinet air conditioners
Alarm code: A01
System message: Open the cabinet door
The cause of the Rittal air conditioner: the opening and closing of the door is not in the correct position
Diagnostic method: Check the changing position of the door and, if necessary, the connection status
Alarm code: A02
System message: The temperature in the cabinet is too high
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Rittal's new Maxi-PLS busbar system is launched!
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Rittal cables – common faults in power cables
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Rittal cabinets – installation steps and rules for cabinet placement
Cabinet installation steps:
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3. Cabinet ...
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Rittal presents its modular data centre solutions
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
What are the precautions for using current transformers?
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.
What are the precautions for using voltage transformers?
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How do two Rittal cabinets fit together?
1. The power cords of the two cabinets are connected to the power socket at the rear of the cabinet.
2. The RS232 interface of the two cabinets is connected together with a communication cable.
3. Lock the door of the main cabinet, and turn on the power from the cabinet and the main cabinet in turn.
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Rittal enclosures – considerations for control cabinet transfers
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How do Rittal cabinets be combined?
1. The power cords of the two cabinets are connected to the power socket at the rear of the cabinet.
2. The RS232 interface of the two cabinets is connected together with a communication cable.
3. Lock the door of the main cabinet, and turn on the power from the cabinet and the main cabinet in turn.
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