21. What does the workplace have to meet for high-voltage electrical appliances?
Answer: A. Rated voltage, B. Maximum working voltage, C. Rated current, D. Rated short-circuit interrupting current, E. Short-time withstand current and peak withstand current.
22. What are the basic requirements for a high-voltage circuit breaker?
Answer: A works reliably; B. Sufficient circuit breaking capacity C. Shortest possible cutting time, D. Simple structure and low price.
23. What is the purpose of the disconnector?
A: A. Isolate electrical equipment from a live grid, B. Change the mode of operation, C. Connect and disconnect small current circuits.
24. What is a busbar?
Answer: In the voltage distribution devices at all levels of power plants and substations, the wires connecting engines, transformers and various electrical appliances are called busbars.
25. What is the classification of busbars?
Answer: soft bus (mostly used in outdoor distribution rooms with high voltage) and hard bus (low voltage mutual internal and external power distribution devices).
26. What is the material of the busbar?
A: Copper busbar, aluminum busbar and steel busbar.
27. What is the significance of busbar coloring?
Answer: It can increase the radiation capacity, which is conducive to heat dissipation, and the allowable load current can be increased by 12-15% after coloring.
28. What are the main technical parameters of the fuse?
Answer: A. Rated voltage, B. Rated current, C. Breaking capacity, D. Melting characteristics, E. Overvoltage.
29. What are the main products of low-voltage power distribution equipment?
A: Low-voltage distribution panels, switch cabinets, switch boards, lighting boxes, power boxes and motor control centers.
30. What is peak load? What is trough load? What is Average Load?
A: Peak load refers to the maximum load that can occur on the grid and the user in a day. Peak load is the hourly average amount of electricity that the grid and consumers use at the least amount of electricity in a day. Average load refers to the average hourly electricity consumption of the grid and users over a defined period of time.
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Analysis of the reasons why the Rittal Rittal cabinet air conditioner shows OL
The probable cause is the phenomenon of the compressor protection device tripping.
Compressor overload protection will trip, indicating that the system is too high-pressure, the pressure is too high, or the overheating current is too high.
Causes and elimination of high pressure and overheating:
1. Too much refrigerant. Reduce the refrigeration dose appropriately.
2, ...
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Rittal cables – the key point of TPE technology in wire and cable
1. TPE material has soft touch, high elasticity, mild texture, adjustable surface gloss and fog brightness, low smoke and halogen-free, phosphorus-free, excellent oil resistance, weather resistance, aging resistance, flex resistance, ozone resistance and chemical resistance.
2. The old TPE material can be simply recycled and recycled.
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Rittal enclosures – how do you maintain your robot control cabinet?
1. Maintenance content
(1) Check the heat dissipation of the controller
It is strictly forbidden to cover the controller with plastic or other materials; Leave enough space behind and on the sides of the controller (> 120mm); It is strictly forbidden to position the controller close to the heat source; It is strictly forbidden to put sundries on the top of the controller; Avoid over-the-top ...
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Rittal precision power distribution cabinet SPDR - make the data center "feel safe".
The power supply and distribution system of the data center is a system that provides stable and reliable power supply support for all the equipment that needs power supply in the computer room. The power supply and distribution system is like the heart of the human body for the entire data center system, and its importance is self-evident.
With the continuous construction of the network ...
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The Rittal TS8 system solution is designed to cope with extreme mining conditions
Energy consumption planning continues to grow, and countries around the world have significantly increased the supply of low-carbon power such as nuclear, hydro, wind, and solar energy in order to achieve energy conservation and emission reduction. But now that natural resources are simply being exploited, what are the important developments of green energy that are lacking? The answer is: geothermal energy ...
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Rittal cabinets – solutions for cooling network cabinets
1. Deliver the cold air to the network cabinet: Because the equipment in the cabinet needs the air conditioning the most.
2. Deliver the cold air to the front of the network cabinet: because the cold air can only enter the module server chassis from the front of the server to play a role in heat exchange.
3. Precisely adjust the ...
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Rittal Cables – an introduction to the process characteristics of cables
1. The impact of large-length continuous superposition combined production mode on the production of wires and cables is global and controllable, which involves and affects:
(1) Production process and equipment layout
All kinds of equipment in the production workshop must be reasonably discharged according to the process flow required by the product, ...
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Rittal cables – common causes of cable failure
1. External force damage. Judging from the operation analysis in recent years, especially in Haipudong, which is developing rapidly, a considerable number of cable failures are caused by mechanical damage. For example, the cable laying and installation is not standardized, which is easy to cause mechanical damage; Engage in direct burial on cables ...
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Description of the models of Rittal cabinet air conditioners
Here are some of the models of Rittal cabinet air conditioners:
SK3368220 air conditioner RBT3368220 300 W, 220V
SK3368320 air conditioner RBT3368320 500 W, 220V
SK3368520 air conditioner RBT3368520 1000W, 220V
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Rittal toroidal transformers Primary connection 115 V/400 V
Rittal toroidal transformer primary connection 115 V/400 V
Product Model: 3201.970
Power supply for wall-mounted air/water heat exchangers in 230 V sizes. A 115 V or 400 V main connector is available.
Product Description: Wall for 230 V Specification
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Rittal cabinet - knowledge quiz of high and low voltage distribution cabinet (1-10)
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, called ...
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Rittal cabinets – what are the steps in the cabling of the cabinet?
1. The first is to measure how long the line is.
According to the decision is to put the location of the distribution frame, and then combine the distance of the cable from the outside into the cabinet and so on to calculate how long the network cable needs to be put on the distribution frame and install the cabinet, so as to facilitate the overall cable management behind.
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Rittal Cables – the principle of selection of power cables
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A detailed assortment of Rittal products
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Rittal enclosures – types of sheet metal enclosures
In terms of structure, there are two ways to classify sheet metal cabinets:
According to the division of the cabinet frame, it can be divided into the whole plate type and the column and beam combination type;
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The difference between imitation Rittal and genuine Rittal
The quality and brand awareness of Rittal are good, and the application market is also large, but due to various reasons such as price, delivery time, service, etc., many customer groups do not want to use Rittal products, but choose to go to the manufacturer to order imitation Rittal products.
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Rittal cabinets – the difference between racks, cabinets, and servers?
1. a rack
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Rittal's new Maxi-PLS busbar system is launched!
In electrical switchgear, the external connection of high-current frame circuit breakers (ACBs) is usually achieved by connecting multiple cables per phase in parallel. When the conventional flat copper bar scheme is adopted, it is necessary to cut a number of bolt fastening holes on the standard copper bar to complete the connection of the cable.
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A detailed presentation of Rittal's new smart electronic lock
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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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