External damage: In the process of storage, transportation, laying and operation of cables, they may suffer external damage, especially the directly buried cables that have been run, and are prone to damage in the ground construction of other projects. Such accidents often account for 50% of cable accidents. In order to avoid such accidents, in addition to strengthening the quality of work in all aspects of cable storage, transportation, laying, etc., it is more important to strictly implement the groundbreaking system.
Corrosion of the protective layer: The galvanic corrosion of underground stray currents or the chemical corrosion of non-neutral soil makes the protective layer ineffective and loses its protective effect on the insulation. The solution is to install drainage equipment in areas with dense stray currents; When the local soil on the cable line contains chemicals that damage the lead package of the cable, the cable should be installed in the pipe, and the neutral soil should be used as the cable liner and cover, and the cable should be coated with asphalt.
Overvoltage and overload operation: improper selection of cable voltage, sudden high-voltage channeling or long-term overload during operation may destroy the insulation strength of the cable and break down the cable. This needs to be solved in a timely manner by strengthening patrols and improving operating conditions.
Outdoor terminal head soaking: due to poor construction, the insulating glue is not filled, resulting in water immersion in the terminal head, and eventually an explosion. Therefore, it is necessary to strictly implement the construction process regulations and carefully accept them; Strengthen inspections and timely maintenance. The oil leakage at the terminal destroys the sealing structure, so that the impregnating agent at the end of the cable is lost and dried up, the thermal resistance increases, the insulation accelerates aging, and it is easy to absorb moisture, resulting in thermal breakdown. When it is found that the terminal head leaks oil, the inspection should be strengthened, and the power should be cut off and redone in serious cases.
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Rittal cables – the difference between power cables and control cables
The power cable is used to transmit and distribute large-scale electrical energy in the main line of the power system, and the control cable directly transmits the electric energy from the distribution point of the power system to the power connection line of various electrical equipment and appliances. The rated voltage of power cables is generally 0.6/1KV and above, and the control cables are mainly 4 ...
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Rittal RBT side-mounted cooling unit cabinet air conditioning
Rittal RBT cooling units – the most economical option for you! If a limited budget makes you extremely cost-conscious, then RBT is the choice for your ambition. After large-scale assembly line production, as well as the excellent functions of the cooling unit itself, the RBT has achieved a very high ...
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Common fault codes and handling methods for Rittal cabinet air conditioners
1. E0: Indoor temperature sensor is faulty. When this fault code appears, you need to check whether the indoor temperature sensor is working properly.
2. E1: Outdoor temperature sensor failure. When this fault code appears, you need to check whether the outdoor temperature sensor is working properly.
3. E2 ...
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Rittal cables – the basic structure of power cables
1. Core: The core is the conductive part of the power cable, which is used to transmit electric energy and is the main part of the power cable.
2. Insulation layer: The insulation layer is to electrically isolate the core from the ground and the cores of different phases to ensure the transmission of electric energy.
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Rittal cables – the performance difference of control cables
The control cable has the characteristics of moisture-proof, anti-corrosion and anti-damage, and can be laid in tunnels or cable trenches. Power cables are used to transmit and distribute high-power electric energy in the main line of the power system, and the control cable transmits the electric energy directly from the distribution point of the power system to the power supply of various electrical equipment and appliances.
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Rittal enclosures – how to determine the quality of a sheet metal enclosure cabinet
1. Look at the material, you should choose a sheet metal chassis cabinet, and the steel plate must be thick, you can feel which ones are thick and which ones are thin when you knock them with your fingers. Its rugged enclosure protects the board, power supply and storage devices, and is resistant to voltage, shock, and dust.
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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
C. Have the shortest possible cut-off time;
D. Simple structure and low price.
What is the purpose of the disconnector?
Answer: A. Electrical...
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Rittal enclosures – Q&A on the basics of high- and low-voltage distribution cabinets
What is a substation?
A: It is a power supply hub that receives electrical energy from the power system, transforms (boosts or downgrades), and then distributes the power.
What is the main role of transformers in the power system?
Answer: The main function is to convert the voltage to facilitate ...
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Rittal cabinets – Q&A on the basics of high and low voltage distribution cabinets
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.
What is the classification of busbars?
Answer: soft bus (mostly used in outdoor power distribution room with high voltage) and hard bus (low ...
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What are Rittal cabinets used for?
1. The cabinet is generally made of cold-rolled steel plate or alloy to store the computer and related control equipment, which can provide protection for the storage equipment, shield electromagnetic interference, arrange the equipment in an orderly and neat manner, and facilitate the maintenance of the equipment in the future. Cabinets are generally divided into server cabinets, network machines, etc.
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Rittal cabinets – the characteristics of GDD and GCK low-voltage distribution cabinets
1. GGD AC low-voltage distribution cabinet has the characteristics of high breaking capacity, good dynamic and thermal stability, flexible electrical scheme, convenient combination, seriality, strong practicability, novel structure and high protection level. It can be used as a replacement product for low-voltage switchgear.
Structural features
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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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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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Rittal enclosures – a classification of low-voltage distribution cabinets
(1) Classified according to the requirements of the power supply system
1) The first-level power distribution equipment is collectively referred to as the power distribution center. They are centrally installed in the substations of the enterprise, and the electrical energy is distributed to the subordinate distribution equipment in different locations. This level of equipment is close to the step-down transformer, so the electrical parameters are high.
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Rittal cabinet - distribution cabinet installation method, installation process and precautions
First, the construction process
Equipment unpacking inspection→ equipment handling, → cabinet (plate), basic installation, → above the cabinet (plate), bus preparation, → cabinet (plate), secondary circuit wiring, → cabinet (plate) test adjustment, → power transmission operation acceptance
Second, the construction process
1. Equipment unpacking inspection, installation ...
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How to set the temperature of the Rittal air conditioner
1. Set the target temperature: the default temperature of the original factory is 35°C, you can press and hold the set button for more than 1 second after starting, the parameters start to flash, complete the temperature adjustment by pressing the UP and DOWN buttons, and after adjusting to the target temperature, press the set button to store the set parameters.
2. High temperature alarm: ...
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Rittal Cables – the principle of selection of power cables
1. Selection of wire and cable models
When selecting wires and cables, it is necessary to consider the use, laying conditions and safety; For example, depending on the application, power cables, overhead insulated cables, control cables, etc. can be selected
According to the different laying conditions, the general plastic insulated cable can be selected ...
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Analysis of the causes of the alarm code of the Rittal cabinet and how to deal with it
A01--- Rittal cabinet control cabinet door opens
View: Look at the door switches in the Rittal cabinet.
Solution:
(1) Adjust the position of the door switch.
(2) Check whether the wiring method is correct (passive normally closed point at 1.2 points).
A03 --- Filter Monitor ...
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What are the common faults of Rittal cables – control cables?
1. The impact of lightning
The armor components of the control cable are all metal conductors, and if the power line is short-circuited or lightning hits the metal parts, a strong current will be generated to destroy the optical cable line equipment, and even casualties will occur in serious cases.
2. Optical cable ...
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What are the main problems in the practical application of Rittal cabinet air conditioners on the client?
Through continuous big data analysis of 200,000 cabinet air conditioners installed and operated on the market, Rittal found that the main problems in the actual application of air conditioners on the client are as follows:
1. Lack of maintenance, resulting in clogged air conditioner filters, which in turn causes the air conditioner to stop running or ...
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